The present disclosure relates to a base station and a terminal device.
BACKGROUND
[0002]
　In a cellular system, the base station is connected to the core network via a backhaul to provide wireless service to the terminal device under the under the control of the core network. The backhaul is typically but is that formed by the wired communication path, in recent years, it has been considered to replace a part of the communication path to the wireless communication path. In particular, it is progressing Study backhaul including a wireless communication channel that utilizes a so-called millimeter wave band (higher frequency band of 30GHz band ~ 70 GHz band, or the like).
[0003]
　For example, in a wireless system other than the cellular system, in Patent Document 1, by the access point to each other mutually transmit beacons, techniques for constructing an autonomous distributed network is disclosed.
CITATION
Patent Document
[0004]
Patent Document 1: JP 2007-129772 JP
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　In an environment wired communication path is premised, backhaul are offered fixedly, was not like path or operating method dynamically changes. However, if the backhaul is formed to include a wireless communication path in response to changes in the movement or environment of the base station, it is desirable backhaul can be constructed flexibly.
[0006]
　In the present disclosure provides a mechanism capable of establishing a backhaul including a wireless communication channel flexibly.
Means for Solving the Problems
[0007]
　According to the present disclosure, it includes a processing unit, which connects to a backhaul including a second logical interface with the second control entity regarding the first logical interface and the user plane of the first control entity regarding the control plane, said a first communication path, wherein the communication path logic interface is formed a second logical interface is formed, a wireless communication channel formed between the first base station and second base station containing both, a base station is provided.
[0008]
　Further, according to the present disclosure, the backhaul including a first logical interface between the control entity regarding the control plane, and connected using a wireless communication channel with another base station, the information relating to the backhaul to system information processing unit for notifying, including a base station comprising a are provided.
[0009]
　Further, according to the present disclosure, the processing unit that performs authentication processing for connection to the backhaul using a radio communication path with the first base station that is connected to the backhaul containing the logical interface with the control entity , the base station comprising a are provided.
[0010]
　Further, according to the present disclosure, the backhaul containing the logical interface with the control entity is connected with a radio communication path with the first base station connected to the backhaul, downstream of one or more the connection between the backhaul by the second base station relays using the wireless communication channel between the second base station, to connect to the backhaul using a radio communication path with the third base station processing unit for the connection request notification to the third base station, the base station comprising a are provided.
[0011]
　Further, according to the present disclosure, the backhaul including a first logical interface between the control entity regarding the control plane, notified from the base station to connect with the wireless communication channel with another base station, system information processing unit that performs processing based on the information about the backhaul included, the terminal device comprising a are provided.
Effect of the invention
[0012]
　According to the present disclosure described above, a mechanism capable of establishing a backhaul including a wireless communication channel to the flexible is provided. Incidentally, the above effect is not necessarily restrictive, with the above effects, or instead of the above effects, any effects shown herein, or other effects that may be grasped from the description, it may be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013]
FIG. 1 is a diagram showing the overall configuration of a cellular system according to an embodiment of the present disclosure.
It is a diagram for explaining a backhaul according to [2] The present embodiment.
3 is a diagram for explaining a backhaul of the present embodiment.
It is a sequence diagram showing an example of the flow of FIG. 4 Typical S1 setup procedure.
5 is a diagram showing an S1-MME interface protocol stack.
6 is a diagram showing an S1-U interface protocol stack.
7 is a block diagram showing an example of a configuration of a base station according to the present embodiment.
8 is a block diagram showing an example of a configuration of a terminal device according to the present embodiment.
9 is a diagram for explaining the technical features according to the first embodiment.
It is a diagram for explaining the technical features according to [10] the same embodiment.
11 is a flowchart illustrating an example of a process flow during cutting of the 2 S1-MME interface by a base station according to the embodiment of.
12 is a flowchart showing an example of the flow of processing when cutting the S1-MME interface by a base station according to the embodiment.
13 is a flowchart showing an example of the flow of processing when cutting the S1-MME interface by a base station according to the embodiment.
14 is a diagram for explaining the technical features according to the third embodiment.
15 is a flowchart illustrating a transmission processing flow of the system information by a base station according to the fourth embodiment.
16 is a flowchart showing an example of connection processing flow of the backhaul by a base station according to the fifth embodiment.
17 is a sequence diagram showing an example of connection processing flow of the terminal device to be performed in a cellular system according to the embodiment.
18 is a sequence diagram showing an example of a flow of connection processing with backhaul by a base station that is performed in a cellular system according to the embodiment.
19 is a diagram for explaining the technical features according to the sixth embodiment.
FIG. 20 is a sequence diagram showing an example of a flow of a connection process in a new backhaul by the connected base station backhaul performed in a cellular system according to the embodiment.
21 is a sequence diagram showing an example of a flow of a connection process with the new backhaul by the connected base station backhaul performed in a cellular system according to the embodiment.
It is a block diagram showing a first exemplary configuration of FIG. 22] eNB.
It is a block diagram showing a second exemplary configuration of FIG. 23] eNB.
Is a block diagram illustrating an example of FIG. 24 schematic configuration of a smart phone.
Is a block diagram showing an example of a schematic configuration of a [25] a car navigation system.
DESCRIPTION OF THE INVENTION
[0014]
　Reference will now be described in detail preferred embodiments of the present disclosure. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0015]
　Further, in this specification and the drawings, elements having substantially the same functional configuration may be distinguished by affixing a different alphabetical letter to the same reference numerals. For example, substantially a plurality of elements having the same function and structure, the base station 100A as needed, distinguished as 100B and 100C. However, when there is no particular need to distinguish between a plurality of elements having the same function and structure are denoted with the same reference numeral only. For example, if the base station 100A, there is no particular need to distinguish between 100B and 100C are simply referred to as base station 100.
[0016]
　The description will be made in the following order.
　　1. Introduction
　　　1.1. Overall structure
　　　1.2. For S1 setup
　　2. Configuration example of each device
　　　2.1. Example of the configuration of the base station
　　　2.2. Configuration of the terminal device
　　3. The first embodiment
　　　3.1. Technical problems
　　　3.2. Technical features
　　4. Second Embodiment
　　　4.1. Technical problems
　　　4.2. Technical features
　　5. Third embodiment
　　　5.1. Technical problems
　　　5.2. Technical features
　　6. Fourth embodiment
　　　6.1. Technical problems
　　　6.2. Technical features
　　7. A fifth embodiment of
　　　7.1. Technical problems
　　　7.2. Technical features
　　8. Sixth Embodiment
　　　8.1. Technical problems
　　　8.2. Technical features
　　9. Application Example
　　10. Summary
[0017]
　<< 1. Introduction
　>> <1.1. Overall Configuration>
　First, with reference to FIG. 1, illustrating the overall configuration of a cellular system 1 according to an embodiment of the present disclosure.
[0018]
　Figure 1 is a diagram illustrating an overall configuration of a cellular system 1 according to this embodiment. As shown in FIG. 1, the cellular system 1, a plurality of base stations 100, a plurality of terminal devices 200, a core network (CN: Core Network) 20, and the Internet 30.
[0019]
　The base station 100 may operate the cell 11, to provide wireless service to one or more terminals 200 located within the cell 11. For example, base station 100A may operate a cell 11A, to provide wireless service to the terminal device 200A. Similarly, the base station 100B may operate a cell 11B, to provide wireless service to the terminal apparatus 200B. Cell 11 is operated in accordance with any wireless communication system such as, for example, LTE or NR (New Radio). The base station 100 is connected to the core network 20. The core network 20 is connected to the Internet 30 via a gateway device (not shown).
[0020]
　Network of base station 100 and core network 20 is also called backhaul link or backhaul. The network between the base station 100 and the terminal device 200 is also called access links. Typically, the back holes are formed in the wired communication path, the access links are formed by a wireless communication path. For example, base station 100B is connected in the core network 20 and wired. On the other hand, in the present embodiment, there are cases where backhaul via the wireless communication path (i.e., a wireless relay). For example, the base station 100A, using the wireless communication channel with the base station 100B, is connected to a core network 20. In other words, the base station 100A connects to the backhaul using a wireless communication channel with the base station 100B. Hereinafter, mainly, such as base station 100A, discloses a technique for the base stations connected to the backhaul using a wireless communication channel with another base station 100.
[0021]
　Terminal device 200, base station 100 and wireless communication under the control of the base station 100. For example, the terminal apparatus 200 transmits the uplink signal to the base station 100, receives downlink signals from base station 100.
[0022]
　Then, with reference to FIGS. 2 and 3 will be described in more detail backhaul.
[0023]
　Figure 2 is a diagram for explaining a backhaul of the present embodiment. As shown in FIG. 2, the cellular system 1 includes a RAN (Radio Access Network) and CN (core network 20). RAN is a network formed by the base station 100 and the terminal device 200 are connected by a radio interface to the base station 100 and the terminal device 200. In LTE, this interface is also referred to as Uu interface.
[0024]
　On the other hand, the upstream side of the base station 100 (i.e., the core network 20 side), typically, each entity is connected by wire interface. The core network 20 includes an MME (Mobility Management Entity) 21, HSS (Home Subscriber Server) 22, S-GW (Serving Gateway) 23, and P-GW (Packet data network Gateway) 24 such as a control entity. Especially, MME21 and HSS22 are controlled entity about the control plane. MME21 performs session management when the communication is started. HSS22 stores the contract information of the subscriber. Further, S-GW 23 and P-GW24 is a control entity regarding the user plane. S-GW 23 has a role as an anchor point for the terminal device 200 performs the handover between the base station 100. P-GW24 is a connection point between the Internet 30 and the core network 20.
[0025]
　Backhaul connecting the base station 100 and core network 20 includes an S1-U interface between S1-MME interface, and the base station 100 and the S-GW 23 between the base station 100 and MME21. S1-MME interface control entity a control plane (e.g., MME21) an interface (corresponding to a first logical interface), through the signal of the control plane. S1-U interface, the control entity about the user plane (e.g., S-GW 23) is the interface (corresponding to a second logical interface) is an interface signal of the user plane flow. Therefore, it can be said that the backhaul, there are a S1-U interface is a backhaul of S1-MME interface and user plane is a backhaul control plane.
[0026]
　Recently, the backhaul has been formed in a wired communication path, it has been studied to form a wireless communication channel. In particular, Study backhaul including a wireless communication channel that utilizes a so-called millimeter wave band is progressing. An example thereof will be described with reference to FIG.
[0027]
　Figure 3 is a diagram for explaining a backhaul of the present embodiment. As shown in FIG. 3, backhaul via the wireless communication path between the base station 100 is formed. In this case, the traffic to the core network 20 of the base station 100A, via the wireless communication path with the base station 100A and the base station 100B, and a radio communication path with the base station 100B and base station 100C, the core network 20 arriving. In this case, each base station 100 to relay communication with the downstream base station 100 and the backhaul while providing wireless service to the terminal device 200 using conventional LTE or subscriber radio access interface such as HSDPA , carry out the relay for the downstream of the base station 100.
[0028]
　Such backhaul also considered configurable simply replace that part of the communication path S1-MME interface and S1-U interface is formed in the wireless communication path. In that case, you need not be modified protocol that assumes existing wired. However, such backhaul, there is provided fixedly, it is difficult to change the state of the dynamic that path and / or operation.
[0029]
　In the following, discloses a mechanism capable of establishing a backhaul including a wireless communication channel flexibly.
[0030]
　<1.2. > For S1 setup
　to register the base station 100 to the core network 20, S1 setup procedure is used. In the following, with reference to FIG. 4, an example of the flow of S1 Setup procedure.
[0031]
　Figure 4 is a sequence diagram showing an example of a typical S1 setup procedure flow. As shown in FIG. 4, in this sequence, the base station 100 and MME21 are involved. First, the base station 100 transmits the S1 setup request to MME21 (step S102). The base station 100 uses the default MME21 IP address is known, transmits the S1 setup request to MME21. Then, MME21, when receiving the base station 100 transmits the S1 setup response to the base station 100 (step S104).
[0032]
　Even when backhaul is used including a wireless communication channel, it is assumed that S1 setup procedure described above is executed. However, S1 setup procedure, connection is not lost, it is performed between a base station 100 connected by wire and MME21 was assumed. On the other hand, in backhaul including a wireless communication channel, especially a multistage wireless relay (i.e., a wireless communication path) in the backhaul comprising, it could be lost connection established using the S1 setup procedure. That is, there is a possibility that poor connection occurs to S1 setup. For example, backhaul including a wireless communication path, assuming a case where it is applied to a more compact base station, a wireless communication path between the small base station, conceivable cases being blocked by the object or car traffic, and the like. Further, the backhaul is widespread including a wireless communication channel, the frequency band utilized for the backhaul come limited, may occur interference.
[0033]
　S1-MME interface, and also with respect to S1-U interface, similar cases and the above-mentioned connection failure cases can occur. After the S1 setup has been completed is established S1-MME interface. Between the P-GW24 and the base station 100 specified by MME21, it is established S1-U interface. Incidentally, S1 and setting up a connection failure and S1-MME connection failure, it is almost synonymous. This is because, S1 setup of the S1-AP protocol is because is a protocol in the S1-MME interface.
[0034]
　Here, with reference to FIGS. 5 and 6, it will be described protocol stack S1-MME interface and S1-U interface.
[0035]
　Figure 5 is a diagram showing a protocol stack of S1-MME interface. As shown in FIG. 5, S1-MME interface protocol stack, L1, L2, IP (Internet Protocol), comprising SCTP (Stream Control Transmission Protocol), S1-AP, and NAS to (Non access stratum). L1 and L2 is a protocol that provides a wireless interface. IP is an Internet protocol. SCTP is a protocol that provides a retransmission. S1-AP is a protocol signal procedure between the base station 100 and MME21. S1-AP is established by S1 setup. NAS is a exchange of protocol signals between the terminal device 200 MME21 and. From the above, the protocol stack from L1 to S1-AP, can be regarded as backhaul for carrying the NAS.
[0036]
　Figure 6 is a diagram showing a protocol stack of S1-U interface. As shown in FIG. 6, the S1-U interface protocol stack includes a L1, L2, IP, UDP (User Datagram Protocol), and GTP (GPRS (general packet radio service) Tunneling Protocol) v1-U. UDP is not carried out a retransmission protocol. GTPv1-U is a tunneling protocol between the terminal device 200 and the S-GW 23. Note that the tunneling protocol is a protocol for placing any protocol over the protocol. GTPv1-U, the terminal device 200 is established for each terminal device 200 when connected to the network, user data is exchanged over GTPv1-U. From the above, the protocol stack from L1 to UDP, can be regarded as backhaul for conveying user data thereon and GTPv1-U.
[0037]
　<< 2. Configuration example of each apparatus
　　>> <2.1. Configuration example of the base station>
　Fig. 7 is a block diagram showing an example of a configuration of a base station 100 according to this embodiment. Referring to FIG. 7, the base station 100 includes an antenna unit 110, the wireless communication unit 120, a network communication unit 130, storage unit 140 and the processing unit 150.
[0038]
　(1) Antenna unit 110
　antenna unit 110 radiates into the space a signal output by the radio communication unit 120 as a radio wave. The antenna unit 110 converts the radio waves of space signal, and outputs the signal to the radio communication unit 120.
[0039]
　(2) wireless communication unit 120
　radio communication unit 120 transmits and receives signals. For example, wireless communication unit 120 transmits a downlink signal to the terminal device, it receives uplink signals from the terminal device.
[0040]
　(3) Network communication unit 130
　network communication unit 130 sends and receives information. For example, the network communication unit 130 transmits the information to other nodes, to receive information from other nodes. For example, the other nodes, including other base stations and a core network node.
[0041]
　(4) storage unit 140
　storage unit 140 temporarily or permanently storing a program and various data for the operation of the base station 100.
[0042]
　(5) processing unit 150
　processing unit 150 provides various functions of the base station 100. Processing unit 150 includes a backhaul control unit 151 and the communication control unit 153. Backhaul control unit 151 performs control related backhaul. For example, the backhaul control unit 151 provides information about the backhaul or notify other base station 100 or the terminal device 200, or the other base station 100 is provided from another base station 100, wireless communication channel and it controls the connection to the backhaul through. The communication control unit 153 provides a wireless service to the terminal device 200 to connect to itself. The processing unit 150 may further include other components other than these components. That is, processor 150 may perform also the operation other than the operation of these components.
[0043]
　　<2.2. Configuration> of the terminal device
　8 is a block diagram showing an example of a configuration of a terminal apparatus 200 according to this embodiment. Referring to FIG. 8, the terminal device 200 includes an antenna unit 210, radio communication unit 220, storage unit 230 and the processing unit 240.
[0044]
　(1) Antenna unit 210
　antenna unit 210 radiates into the space a signal output by the radio communication unit 220 as a radio wave. The antenna unit 210 converts the radio waves of space signal, and outputs the signal to the wireless communication unit 220.
[0045]
　(2) wireless communication unit 220
　radio communication unit 220 transmits and receives signals. For example, wireless communication unit 220 receives the downlink signal from the base station, transmits an uplink signal to the base station.
[0046]
　(3) storage unit 230
　storage unit 230 temporarily or permanently storing a program and various data for the operation of the terminal apparatus 200.
[0047]
　(4) processing unit 240
　processing unit 240 provides various functions of the terminal apparatus 200. Processing unit 240 includes an acquisition unit 241 and the communication control unit 243. Acquisition unit 241 acquires information about the backhaul included in the base station 100 notifies system information or RRC signaling like from. The communication control unit 243 performs processing based on the information about the backhaul. For example, the communication control unit 243 performs a handover to switch or another base station 100 to other frequency resources. The processing unit 240 may further include other components other than these components. That is, the processing unit 240 may perform also the operation other than the operation of these components.
[0048]
　<< 3. First Embodiment >>
　In the present embodiment, the configuration of the backhaul common to the embodiment in detail.
[0049]
　<3.1. Technical
　problem> The S1-MME interface, which also includes protocol for S1 setup. Therefore, S1-MME interface high backhaul of such millimeter wave band with respect to frequency (e.g., 70 GHz ~ 100 GHz) when formed include a wireless communication path utilizing, comes out trouble when registering the base station to the MME it is conceivable that. When the connection between the base station and the MME becomes unstable, ready to base station is not registered in the MME, the terminal apparatus becomes difficult to use the base station. Typically, the base station, if the connection between the MME is lost, including the basic signal such system information indicating the capability of the signal for synchronization, and a base station, the transmission of all signals This is to stop. Backhaul, considering that can be relayed to a multi-stage (multi-hop) by wireless communication channel between the base station 100, it is desirable that the relay stages is small.
[0050]
　Even stable part of the wireless communication path of the multi-radio relay, if is unstable some other wireless communication path, the unstable wireless communication channel becomes a bottleneck, After all backhaul can become unstable. Therefore, it is desirable that the quality of the wireless communication channel included in the communication path back hole is formed is minimal collateral.
[0051]
　Hereinafter, therefore, in view of the above relay stages and the relay quality, explaining a mechanism for improving the stability of the backhaul including a wireless communication channel.
[0052]
　<3.2. Technical features>
　　Relay stages
　in the following, with reference to FIGS. 9 and 10, for explaining the technical features to achieve the appropriate relay stages.
[0053]
　Figure 9 is a diagram for explaining the technical features according to the present embodiment. As shown in FIG. 9, the base station 100A may each S1-MME interface and S1-U interfaces, formed on a communication path including the wireless communication path. For example, S1-MME interface is formed on a communication route via the base station 100B. Further, S1-U interface is formed in the communication path passing through the base station 100B, 100C and 100D. Incidentally, forming the S1-MME interface or S1-U interface is assumed to be synonymous with connecting to the S1-MME interface or S1-U interface.
[0054]
　S1-MME and the interface communication path channel and S1-U interface to be formed is formed, it may include both the same radio channel. In the example shown in FIG. 9, S1-MME and the interface communication path channel and S1-U interface to be formed is formed, a wireless communication channel formed between the base station 100A and the base station 100B and both comprise. Thus, the S1-MME interface and the S1-U interface, may coexist on the same physical interface.
[0055]
　On the other hand, S1-MME communication path interface is formed with the communication path S1-U interface is formed, may include different wireless communication paths with each other. In the example shown in FIG. 9, a communication path S1-U interface is formed, unlike the communication path S1-MME interface is formed, a wireless communication channel formed between the base station 100B and base station 100C , and a wireless communication channel formed between the base station 100C and the base station 100D. Thus, the S1-MME interface and the S1-U interface can be formed on a different physical interface.
[0056]
　In a wireless communication path of S1-MME interface or S1-U interface is formed, Relays from MME21 or S-GW 23 is greater downstream from the signals of the base station 100 is multiplexed. In the example shown in FIG. 9, in a wireless communication pathway formed between the base station 100C and the base station 100D, the signal of the base station 100A, the signal of the base station 100B, and the signal of the base station 100C is multiplexed. In other words, the base station 100C, the base station 100C own signal, transmitting or receiving signal multiplexed with the signal and the base station 100A of the base station 100B.
[0057]
　S1-MME interface or S1-U interface base station 100 on the communication path to be formed is transferred from the signal or upstream from downstream to upstream signals to the downstream transparently. For example, base station 100B is a signal to MME21 received from the base station 100A transparently transferred to MME21, transferred to transparently base station 100A the signal to the base station 100A received from MME21.
[0058]
　Such features of the backhaul including a wireless communication channel, allows the construction of flexible backhaul. For example, among a plurality of interfaces, or using a common radio channel, to it is possible or using different wireless communication path, it is possible to efficiently communicate with multiple and transparent transfer of packets.
[0059]
　Further, the base station 100 is connected to the S1-MME interface via the number of base stations small compared with the S1-U interface. For example, the base station 100A, the number of base stations through than S-U interface via base stations 100B, 100C and 100D is small, to connect to the S1-MME interface via base station 100B. This is the base station 100, have means selecting according to the number of base stations to other base stations 100 that connect to form a wireless communication channel, through which to connect to the S1-MME interface it may be. Such control, the base station 100, the S1-MME interface regarding a high priority control plane than S1-U interface related to the user plane, it is possible to connect via the wireless relay of fewer stages. Since this improves the stability of the S1-MME interface, the base station 100, it is possible to stably provide wireless service to the terminal device 200. Reducing the number of base station 100 via may be words to using frequency resources of the lower frequency. This will be described with reference to FIG. 10.
[0060]
　Figure 10 is a diagram for explaining the technical features according to the present embodiment. As shown in FIG. 10, the base station 100, a wireless communication path for the S1-MME interface, S1-U wireless communication path with a low frequency of the frequency resources as compared to the interface (e.g., component carrier) to using formed. Since more communicable distance becomes longer at low frequencies, utilizing a frequency resource of the low frequency, it can be realized to reduce the relay stages. The base station 100 by using the frequency resources of the low frequency, the S1-MME interface, it is possible to connect via the wireless relay of fewer stages. Thus, the stability is improved in the S1-MME interface, the base station 100 is enabled to provide wireless service to the terminal device 200 stably.
[0061]
　To connect to the S1-MME interface using frequency resources of the lower frequency, the base station 100 uses the frequency resources of the low frequency, to perform the S1 setup procedure. Then, the base station 100 is connected to the S1-MME interface via the other base station 100 to send the S1 setup request. On the other hand, the base station 100 uses the frequency resource having a higher frequency of the frequency resources provided by other base stations 100 that is connected to the S-GW 23, connected to the S1-U interface. Note that to connect to the S1-MME interface via another base station 100 may be means to connect to the S1-MME interface to which the other base station 100 is already connected. The same applies to the S1-U interface.
[0062]
　The base station 100 may be formed by using the frequency resources of the frequency are less affected by rainfall wireless communication path for the S1-MME interface. For example, the base station 100, such as 70GHz band or 80GHz band, avoiding frequency is large rain attenuation, to form the S1-MME interface. Since this improves the stability of the S1-MME interface, the base station 100, it is possible to stably provide wireless service to the terminal device 200.
[0063]
　　Relay Quality
　below describes the technical features for ensuring the relay quality in the communication path.
[0064]
　Base station 100, information regarding the communication paths S1-MME interface or S1-U interface is formed, is exchanged between the other base station 100. The information which the exchanged also called routing information. Route information, for example, a frequency band that requires for the wireless communication channel included in the communication path back holes are formed, may include actually the lowest frequency band or for best frequency band are currently available. The route information is delayed request relates to a wireless communication channel included in the communication path back holes are formed, SN (signal to noise ratio) requirements, or reliability requirements may include at least one. Path information, in the related ones and S1-U interface related to S1-MME interface, may be managed separately.
[0065]
　By routing information is exchanged between the base station 100, base station 100 can be connected to the backhaul to avoid the other base station 100 which is a bottleneck unacceptable. Further, the base station 100, based on the exchange route information, it is possible to select the frequency resources for connections to the backhaul.
[0066]
　Exchange of routing information may be periodically or non-periodically performed. For example, the base station 100, to S1 setup request may include the path information. Further, the exchange of route information, also, may be performed after established than when establishing the wireless communication path. In the latter case, the base station 100, etc. to change the frequency resources to be used for backhaul, it is possible to perform maintenance to more desirable backhaul is formed.
[0067]
　An example of the route information, shown in Tables 1 to 3 below.
[0068]
[Table 1]

[0069]
　In the example shown in Table 1, in all the radio communication channels included in the communication path, although it is required to utilize the following component carrier 26 GHz, in practice, wireless communication using the component carrier of 50GHz It has been shown to be road.
[0070]
[Table 2]

[0071]
　In the example shown in Table 2, and the path information about the path information and the S1-U interface related to S1-MME interface is separate.
[0072]
[table 3]

[0073]
　In the example shown in Table 3, SN requirements in all wireless communication channel included in the communication path, the actual highest SN and minimum SN are included in the route information.
[0074]
　Backhaul in the following each embodiment, it is assumed that a backhaul including a wireless communication path described above.
[0075]
　<< 4. Second Embodiment >>
　this embodiment, the base station 100 connected to a backhaul including a wireless communication path, even unstable wireless communication channel included in the backhaul, stable to the terminal device 200 under it is configured to provide a specific wireless services.
[0076]
　<4.1. Technical Issues>
　typical base station, if the connection to the case or MME connection with the MME is not completed is lost, basic, such system information indicating the capability of the signal for synchronization, and a base station a signal, stops the transmission of all signals. Specifically, the S1-MME interface, SCTP protocol has a function of Keep Alive, performed between the base station periodically exchanges packets and MME, monitors whether the line is not interrupted at all times . Line gone interrupted, S1 when the communication path using the setup becomes unreachable, often a base station even retransmit S1 setup request fails. Meanwhile, the base station will stop transmission of all signals to the terminal device, the terminal device has been connected to the base station had to temporarily abandon the connection with the base station.
[0077]
　S1-MME interface, considering the case where it is formed on a communication path including the unstable wireless communication channel than the wire, may not wireless services to even if unstable terminal device is stopped desirable.
[0078]
　<4.2. Technical features>
　　maintaining downlink communication
　the base station 100, S1-MME if the interface is disconnected, a predetermined time until the (first corresponding to a predetermined time) has expired, the terminal device a predetermined signal 200 to send to. For example, the predetermined signal includes a reference signal, at least one of synchronization signal or system information. Incidentally, the reference signal here may be any downlink reference signal such as CRS (Cell-specific Reference Signal) or CSI-RS (Channel State Information Reference Signal). Further, the synchronization signal may be a PSS (Primary Synchronization Signal) or SSS (Secondary Synchronization Signal), the reference signal may be used as a synchronization signal. The system information may be a MIB (Master Information Block) or SIB (System Information Block). By transmitting the predetermined signal is continued, even if the connection to the base station 100 and MME21 lost, the terminal device 200 is to continue to connect with the base station 100, it is provided it is possible to receive the wireless service.
[0079]
　Especially, the base station 100 is connected to the backhaul using a wireless communication channel with another base station 100, it notifies including information about the backhaul to system information. Information about the backhaul may include information indicating the state of the control plane. For example, information about the backhaul may include information indicating that the S1-MME interface is disconnected. Further, the information indicating that the S1-MME interface is disconnected, it may also include information indicating that the before the expiration of the predetermined time is being restored, after the expiration of the predetermined time failed to recover it may include information indicating that. Also, information about the backhaul may include information indicating the status of the user plane. For example, information about the backhaul may include information indicating that the S1-U interface is disconnected. Here, the cutting here, means that any of the wireless communication channel on the communication path S1-MME interface or S1-U interface is formed is cut. An example of a state of the backhaul notified included in system information, shown in Table 4 below.
[0080]
[Table 4]

[0081]
　For example, if the state B, the base station 100 notifies the system information, including that the state B to the terminal apparatus 200. In state B, and S1-MME interface is disconnected, S1-U interface maintains a good connection. In this case, it is possible unnecessary procedures communications S1-MME interface, initial attach, unless paging, or another QoS requires procedures of the control system of the production or the like of the bearer corresponding base station 100 to continue the communication. In that case, the base station 100, until the established session is completed, it is possible to communicate using the S1-U interface. The base station 100 performs scheduling of downlink and uplink therefor, to provide continuing transmitting and receiving service data to the terminal device 200. Note that the initial attach, when the terminal apparatus 200 was power-off is powered ON, a procedure for registering the terminal device 200 to the network. Paging is a procedure for performing a telephone call the incoming call to the terminal device 200.
[0082]
　The base station 100, if the S1-U interface is disconnected, stops downlink data transmission. Further, the base station 100, if the S1-MME interface is disconnected, even when the connection of the S1-U interface is maintained, may be stopped data transmission in the downlink.
[0083]
　Base station 100, if the S1-MME interface until a predetermined time expires is restored to continue the wireless service to the terminal device 200 returns to the normal state. On the other hand, the base station 100, when expired predetermined time without restored and S1-MME interface, stops the transmission of the predetermined signal to the terminal apparatus 200.
[0084]
　Until or until a predetermined time expires S1-MME interface is restored from being disconnected, the state of the terminal device 200 can be either an RRC connected state or an RRC idle state.
[0085]
　The flow of processing relating to maintenance of the described downlink communication above will be described with reference to FIG. 11.
[0086]
　Figure 11 is a flowchart showing an example of the flow of processing when cutting the S1-MME interface by the base station 100 according to this embodiment. As shown in FIG. 11, first, the base station 100 detects the disconnection of the S1-MME interface (step S202), and starts a timer T1 (step S204). Then, the base station 100 provides information about the backhaul, the terminal apparatus 200 included in the system information (step S206). Then, the base station 100, while stops the transmission and reception of the user data (step S208), and continues to transmit the synchronization signal (step S210). Then, when detecting a recovery of the S1-MME interface (step S212 / YES), the base station 100 resumes the transmission and reception of the user data (step S214).
[0087]
　On the other hand, when the recovery of the S1-MME interface is not detected (step S212 / NO), the base station 100 determines whether timer T1 has expired (step S216). If the timer T1 is determined to not expired (step S216 / NO), the process returns to step S206.
[0088]
　On the other hand, if the timer T1 is determined to have expired (Step S216 / YES), the base station 100 stops the transmission of all downlink signals (step S218).
[0089]
　　Uplink of communication maintenance
　has been described above for the downlink. Next, a description for the uplink.
[0090]
　The base station 100 may, until when S1-MME interface is disconnected, a predetermined time or S1-MME interface to (a second corresponding to a predetermined time) has expired restored, uplink from the terminal device 200 to accumulate data. Specifically, the base station 100 for a predetermined time, the uplink data based on the UL scheduling for the terminal device 200, and UL without scheduling uplink data (i.e., Grant Less UL Data) to continue to receive. Then, the base station 100, as L1 / L2 level response signal, returns a response signal to the received uplink data (ACK or NACK) to the terminal device 200 stores the received information in an internal buffer.
[0091]
　Then, the base station 100, when expired predetermined time without restored and S1-MME interface, to erase the accumulated uplink data, if the S1-MME interface before expiration is restored, transfer the stored uplink data to. Thus, when recovering from being disconnected S1-MME interface before the predetermined time expires, the terminal device 200, without being aware of the backhaul upset any, it is possible to perform uplink communications.
[0092]
　The flow of processing relating to maintenance of the described uplink communication above will be described with reference to FIG. 12.
[0093]
　Figure 12 is a flowchart showing an example of the flow of processing when cutting the S1-MME interface by the base station 100 according to this embodiment. As shown in FIG. 12, first, the base station 100 detects the disconnection of the S1-MME interface (step S302), starts a timer T1 (step S304). Then, the base station 100 provides information about the backhaul, the terminal apparatus 200 included in the system information (step S306). Then, the base station 100, while stops the transmission and reception of the user data (step S308), the uplink buffers to continue receiving the user data (step S309), and continues to transmit the synchronization signal (step S310) . Then, when detecting a recovery of the S1-MME interface (step S312 / YES), the base station 100, (step S314) with resumes transmission and reception of user data, transmits the uplink user data buffered to the core network 20 (step S315).
[0094]
　On the other hand, when the recovery of the S1-MME interface is not detected (step S312 / NO), the base station 100 determines whether timer T1 has expired (step S316). If the timer T1 is determined to not expired (step S316 / NO), the processing returns to step S306.
[0095]
　On the other hand, if the timer T1 is determined to have expired (Step S316 / YES), the base station 100 stops the transmission of all downlink signals (step S318).
[0096]
　　· MEC server usage of
　typical application server is placed on the Internet 30. In contrast, for the purpose of alleviating such traffic delay reduction and the core network 20, there are cases where the application server is arranged more close to the terminal apparatus 200. Such application server, also called MEC (Mobile Edge Computing) server. MEC server typically arranged to the base station 100 (placed inside or features to outside), provides an application to the terminal device 200 to be connected to the base station 100.
[0097]
　Base station 100, S1-MME if the interface is disconnected, the communication can be an application server (i.e., MEC server) to continue to provide service to the terminal device 200 using the. MEC server, if a lot, it may be connected backhaul is lost that can communicate with the base station 100 to be mounted inside the neighbor or base station 100 of the base station 100. Therefore, the base station 100 is able to continue to provide service by MEC server.
[0098]
　Therefore, the base station 100 permits the continued use of MEC server to the terminal device 200 transmits the downlink data from the MEC server to the terminal apparatus 200 transmits the uplink data from the terminal device 200 to the MEC server .
[0099]
　However, the base station 100 is directed to the provision of services by MEC server, for procedures that require signaling and MME21, stops. Further, the base station 100, if the predetermined time has expired since the cut S1-MME interface, may stop using MEC server.
[0100]
　The flow of processing related to the use of MEC server described above will be described with reference to FIG. 13.
[0101]
　Figure 13 is a flowchart showing an example of the flow of processing when cutting the S1-MME interface by the base station 100 according to this embodiment. As shown in FIG. 13, first, the base station 100 detects the disconnection of the S1-MME interface (step S402), starts a timer T1 (step S404). Then, the base station 100 provides information about the backhaul, the terminal apparatus 200 included in the system information (step S406). Then, the base station 100, while stops the transmission and reception of the user data (step S408), and continue to send and receive MEC application data by the MEC server (step S409), and continues the transmission of the synchronization signal (step S410). Then, when detecting a recovery of the S1-MME interface (step 412 / YES), the base station 100 resumes the transmission and reception of the user data (step S414).
[0102]
　On the other hand, when the recovery of the S1-MME interface is not detected (step S412 / NO), the base station 100 determines whether timer T1 has expired (step S416). If the timer T1 is determined to not expired (step S416 / NO), the process returns to step S406.
[0103]
　On the other hand, if the timer T1 is determined to have expired (Step S416 / YES), the base station 100 stops the transmission of all downlink signals (step S418).
[0104]
　<< 5. Third Embodiment >>
　this embodiment, the base station 100, in order to contribute to the determination of the other base station 100 or the terminal device 200 is in the form that notifies information about the backhaul itself connected to the ambient.
[0105]
　<5.1. Technical problem>
　As described above, the backhaul may include multi-stage radio relay. If the relay stages often increases delay, if a small relay stages delay is reduced. Depending on the application to which the terminal use, it may prefer low latency is desirable.
[0106]
　The base station 100 includes a plurality of frequency resources (e.g., component carrier) to provide wireless service to the terminal device 200 using the. Each of the wireless services provided by each of the plurality of frequency resources, not necessarily be provided all using the same backhaul. Typical terminal apparatus 200 refers to the communication quality of each frequency resources, has been selected to use frequency resources. In an environment where backhaul is used including a wireless communication channel, based on the information terminal device 200 is related to backhaul, it is desirable to be selectable Use frequency resources.
[0107]
　<5.2. Technical features>
　base station 100 notifies including information about the backhaul to system information. Especially, the information about the backhaul of the present embodiment includes information indicating the delay time of the back hole corresponding to frequency resources base station 100 is provided. The delay time here may be a delay time of the S1-MME interface, or may be a delay time of the S1-U interface. Terminal apparatus 200 which has received the provision of information indicating the delay time, it is possible to, or handover delay time is connected to the acceptable base station 100. The information indicating the delay time may be the estimated value of delay time. An example of a predictive value of the delay time included in the system information, shown in Table 5 below.
[0108]
[table 5]

[0109]
　As shown in Table 5, the information indicating the delay time for each frequency resource may be provided. Such terminal apparatus 200 which has received the provision of information, it is possible to select the delay time allowable radio resources.
[0110]
　The information about the backhaul to be notified to the terminal device 200 may include information indicating the other base station 100 to be connected. For example, the system information may include so-called white list. Terminal device 200 refers to the white list, it is possible to connect to the appropriate points of the base station 100.
[0111]
　Here, the delay time of one base station 100 is the sum of the delay time of each radio relay on the communication path of the backhaul which the base station 100 is connected. This will be described with reference to FIG. 14.
[0112]
　Figure 14 is a diagram for explaining the technical features according to the present embodiment. As shown in FIG. 14, the delay time increases with the number of the base station 100 via. For example, it takes 20ms to radio communications between the base stations of the base station 100A ~ 100D. In that case, the base station 100D is so connected with the core network 20 by the delay time 20ms, it notifies including the delay time is 20ms in the system information to the terminal apparatus 200. The base station 100C, so connected with the base station 100D and the delay time 20 ms, the delay time is notified to the terminal apparatus 200 included in the system information that it is 40 ms. Further, the base station 100B, since connected by a delay time 20ms base station 100C, including the delay time is 60ms in the system information and notifies the terminal apparatus 200. Further, the base station 100B, since connected with the base station 100B and the delay time 20 ms, the delay time is notified to the terminal apparatus 200 included in the system information that it is 80 ms.
[0113]
　The base station 100 transmits, to another base station 100 to enable computing the delay time, the information indicating the delay time of the back hole corresponding to the frequency resources provided by the base station 100 itself, to another base station 100 it may be. For example, information shown in Table 5, may be more transmitted to other downstream base station 100. The base station 100, based on the information indicating the delay time obtained from the upstream of the base station 100, it is possible to predict its delay time. Further, the base station 100 which has received the provision of information indicating the delay time, select the other base station 100 an acceptable delay time, it is possible to connect to the backhaul.
[0114]
　<< 6. Fourth Embodiment >>
　this embodiment, the base station 100, a connection with the backhaul itself is connected, information indicating whether to provide the other base stations 100, to another base station 100 it is in the form to be notified.
[0115]
　<6.1. Technical Issues>
　radio channel included in the backhaul of the present embodiment may be changed dynamically (e.g., addition or deletion). For example, a new base station 100 the power is turned on, connected to the neighboring base station 100 may be connected to the backhaul. Therefore, the base station 100, based on the information of the neighbor base station 100, it is desirable to select whether to send to which neighboring base stations 100 and S1 setup request. Here, S1 set app quests, the base station 100 to be connected to a core network 20, a request for transmitting first the core network 20.
[0116]
　It does not contain a wireless communication path, for the formation of backhaul that assumes wired procedures were present for the base station 100 to automatically obtain an X2 interface with the nearby base station 100. The procedure base station 100 transmits a request to form an X2 interface to neighboring base station 100 based on the inquiry information of neighboring base stations 100, the result of the inquiry with respect MME21, that It was those. X2 interface is an interface between the base station 100, not the interface for connecting the core network 20 and the base station 100. Therefore, in order to obtain information for the destination select the S1 setup request, it is not appropriate to use such a procedure.
[0117]
　As described above, the base station 100, in order to select the destination of the S1 setup request, the mechanism that makes it possible to obtain information of the neighboring base station 100 is provided is preferable.
[0118]
　<6.2. Technical features>
　base station 100 notifies including information about the backhaul to system information. Especially, the information about the backhaul of the present embodiment, whether capable of providing wireless communication channel for connection to the backhaul to other base stations 100, a connection with the backhaul to other base stations 100 in other words It includes information indicating whether or not capable of providing. For example, the base station 100 connected to the backhaul, the information indicating that can accept the S1 setup request is transmitted included in the system information. Base station not connected to the backhaul 100, based on this information, and transmits the selectively S1 setup request to the base station 100 can accept an S1 setup request, it can be connected to the backhaul Become.
[0119]
　Here, typically, the base station 100 connected to the backhaul can provide a connection to a backhaul to other base stations 100. However, whether or not actually provided possible or the ability of the base station 100 (e.g., machine resources, or frequency resources) or load (e.g., already provide a connection with the backhaul to other base stations 100) also it depends. Accordingly, the base station 100 itself are connected to the already backhaul, and, if there is sufficient capacity and load, including information indicating that it is possible to provide a connection to the backhaul to system information Send.
[0120]
　The flow of processing relating to transmission of the system information described above will be described with reference to FIG. 15.
[0121]
　Figure 15 is a flowchart illustrating a transmission processing flow of the system information by the base station 100 according to this embodiment. As shown in FIG. 15, first, the base station 100 determines whether or not connected to the backhaul (step S502). If it is determined that connected to the backhaul (S502 / YES), the base station 100 determines whether there is a margin for providing a connection with the backhaul (step S504). If it is determined that there is room to provide a connection to a backhaul (S504 / YES), the base station 100 notifies that it is possible to provide a connection to a backhaul system information (step S506). On the other hand, if it is determined that there is no room to provide a connection to a backhaul (S504 / NO), the base station 100 notifies that it is impossible provide a connection to the backhaul system information (step S508). When it is determined not to be connected to the backhaul (S502 / NO), the base station 100 stops the transmission of all downlink signals (step S510).
[0122]
　<< 7. Embodiment >> of the fifth
　embodiment is in a form restricted for utilizing backhaul including a wireless communication path is imposed on the base station 100.
[0123]
　<7.1. Technical problem>
　In an environment backhaul is premised to be formed only by wire, the operator had to manage the connection between the control entity of the base station 100 and MME21 or core network 20 such as S-GW 23. Base station 100 and the control entity, even if it is connected via a wireless communication path of the microwaves, such connection is a static connection managed by the operator, the connection is dynamically changed It was not able to. Therefore, even if the base station 100 is not performed authentication of the order to use the back hall, on the security problem did not occur.
[0124]
　For the backhaul including a wireless communication channel, the base station 100 using unauthorized frequency resources that are used for the backhaul is a shared radio resource appears a problem that resources of the backhaul from being wastefully used arises there is a risk. Further, since the wireless communication path included in the backhaul can be dynamically changed outside the control of the operator, the security should also be considered.
[0125]
　Accordingly, the base station 100, authentication for connection to the backhaul including a wireless communication channel (i.e., authentication for connection to the core network 20 via the wireless communication path) mechanism for performing that is provided desirable.
[0126]
　In such a mechanism, the base station 100, if available a backhaul including a wireless communication path, performs authentication for connection to the core network 20. Thereafter, the terminal device 200 performs authentication to connect to the network. Table 6 below shows a list of the authentication process to be performed with respect to backhaul including a wireless communication channel.
[0127]
[Table 6]

[0128]
　<7.2. Technical features>
　For example, the base station 100, power is applied, the timing of such moves, searching the neighboring other base station 100 that is connected to the backhaul, with the other base station 100 attempting to connect to the backhaul via a wireless communication path. At that time, the base station 100 performs the authentication process to connect to the backhaul using a wireless communication channel with another base station 100 connected to the backhaul. That is, the base station 100 performs the authentication process for connecting to the backhaul. Thus, only the base station 100 that is allowed it is possible to connect to the backhaul, security is ensured.
[0129]
　The method of procedure of the authentication process can be variously considered. In the following, as an example, a base station that is not connected to the backhaul base station 100A (corresponding to the second base station), as the base station 100B to the connected base station (corresponding to the first base station), the first procedure and the second procedure is described.
[0130]
　　- first procedure
　First, the base station 100A performs the authentication process as a terminal apparatus for radio communication by connecting to the base station 100B. For example, base station 100A is equipped with SIM (Subscriber Identity Module) card, performs an attach procedure using the SIM information. Thus, the base station 100A performs authentication with the core network 20 via the base station 100B, it is possible to connect to the network as a terminal device.
[0131]
　Base station 100A which is connected to the base station 100B as the terminal device transmits a connection request to the backhaul to base station 100B. Base station 100B, to the connection request to the backhaul from the base station 100A, and returns information indicating whether connection is possible. Specifically, the base station 100B is whether or not to permit the connection request to the backhaul from the base station 100A, queries the MME21. Then, the base station 100B is, according to the query result, and returns the information that indicates the connection propriety. The connection request and reply to it with backhaul can be performed using the RRC signaling.
[0132]
　The flow of processing relating to transmission of the system information described above will be described with reference to FIG. 16.
[0133]
　Figure 16 is a flow chart showing an example of connection processing flow of the backhaul by the base station 100 according to this embodiment. As shown in FIG. 16, first, the base station 100A in order to connect to the network as a terminal device, and transmits the MME21 an attach request via the base station 100B (step S602). Then, MME21 and HSS22 the base station 100A authenticates as a terminal device, when the authentication succeeds, sends an attach accept indicating that the authentication is completed to the base station 100A via the base station 100B ( step S604). By the above procedure, the base station 100A connects to the core network 20 as a terminal device.
[0134]
　Subsequently, the base station 100A as the base station, to connect the backhaul. First, the base station 100A transmits a backhaul connection request, for example, the base station 100B in RRC signaling to request a connection with the backhaul via a wireless communication path with the base station 100B (step S606). Incidentally, the backhaul connection request includes the identification information of the base station 100A. Then, the base station 100B transmits the identification information of the base station 100A to MME21 (step S608). Next, MME21 and HSS22 the base station 100A is determined whether the base station available for backhaul, if it is determined to be available to transmit the successful authentication to the base station 100B (step S610 ). Then, the base station 100B judges whether to provide the connection to the backhaul to the base station 100A (step S612). For example, base station 100B, when there is sufficient capacity and load, determines to provide. If it is determined to provide the base station 100B transmits a backhaul connection permission indicating the permission of the connection, for example, to the base station 100A in the RRC signaling (step S614). Incidentally, the backhaul connection permission includes frequency resources (e.g., component carrier) to provide a connection to a backhaul information for specifying a permission code or the like for connecting to the backhaul, the setting information. Next, base station 100A transmits an S1 setup request to the frequency resources indicated by the setting information (step S616). Then, the base station 100B transfers the S1 setup request received MME21 (step S618). Then, MME21 sends a S1 setup response to the base station 100B (step S620). Then, the base station 100B transfers the S1 setup response received to the base station 100A (step S622).
[0135]
　By the above procedure, the base station 100A completes the connection to the backhaul, it is possible to use the backhaul.
[0136]
　　- second procedure
　to the first procedure, the base station 100A has been connected as the first terminal device. Since such procedure is complicated, it is desirable that the simplified procedures are provided. Especially, the base station 100B is, if you are abundantly possess available frequency resources in order to provide a connection to a backhaul to base station 100A is the procedure to connect the first terminal device is omitted It is desirable
[0137]
　Therefore, the base station 100B notifies including authentication information indicating an unnecessary frequency resources for wireless connection to a backhaul to the system information to the base station 100A. For example, base station 100B, the frequency resources (e.g., component carrier) to provide a connection to a backhaul of the information for authentication to identify the unwanted frequency resources, informs included in the system information. Thus, the base station 100A is obtained from the received system information, and transmits the S1 setup request to the authentication processing is unnecessary frequency resources, it is possible to connect to the backhaul.
[0138]
　Base station 100A is the information that the authentication process exhibits an unnecessary frequency resources for wireless connection to the backhaul, it may be obtained by using the authentication information set. In other words, the authentication process is information indicating an unnecessary frequency resources for wireless connection to a backhaul predetermined authentication information (e.g., encryption key) only specific base station 100A having may be obtainable. In this manner, the authentication processing information indicating an unnecessary frequency resources for wireless connection to the backhaul is encrypted, the authentication process is to suppress excessive relaxation of limitations due to the fact that no longer needed it is possible.
[0139]
　When the terminal device 200 is connected to the network performs an authentication procedure after the random access to establish a bearer. In contrast, the base station 100A using the designated frequency resources by the base station 100B, perform a direct S1 setup procedure after the random access. This will be described with reference to FIGS. 17 and 18.
[0140]
　Figure 17 is a sequence diagram showing an example of a flow of a connection process of the terminal apparatus 200 performed in a cellular system 1 according to this embodiment. As shown in FIG. 17, in this sequence, the base station 100, the terminal apparatus 200, MME21 and HSS22 are involved. First, the terminal device 200 performs a random access with the base station 100 (step S702). Then, the terminal device 200 performs authentication with the MME21 and HSS 22 (step S704), establishes a subsequent bearer (step S706).
[0141]
　Figure 18 is a sequence diagram showing an example of a flow of connection processing with backhaul by the base station 100A which is executed in a cellular system 1 according to this embodiment. As shown in FIG. 18, in this sequence, the base station 100A, the base station 100B, MME21 and HSS22 involved. First, available for connection with backhaul transmits information indicating a (i.e., the authentication process is not required) frequency resources, the base station 100A included in the system information (step S802). Then, the base station 100A makes a random access with a base station 100B (step S804). Then, the base station 100A performs S1 setup procedure between MME21 and HSS 22 (step S806). At that time, the base station 100A is specified by the received system information, with respect to the frequency resources available to connect to the backhaul, sending the S1 setup request.
[0142]
　As described above, in the case of the second procedure, after the S1 setup procedure is completed, so that the authentication of the base station 100A is performed. Thus, in the second procedure, not before the authentication is performed backhaul is used. However, by receiving the second procedure only to certain frequency resource, it is possible to apply certain restrictions. Also, if the information indicating that the authentication process is unnecessary frequency resources for wireless connection to the backhaul is encrypted, it is possible to apply a further restriction. Thus, also in the second procedure, the security is ensured.
[0143]
　<< 8. Embodiment >> of the sixth
　embodiment, the already connection of a new backhaul by the base station 100 connected to the backhaul, dynamic changes of the radio channel included in the backhaul (e.g., a form to properly implement the addition or deletion).
[0144]
　<8.1. Technical Issues>
　already base station 100 already connected via a wireless communication path to the backhaul, (in other words, reliability) quality of the connection between the backhaul in order to improve, the existing route to backhaul in addition connection in a new route or place of (i.e., connection to another new base station 100) can be considered when trying to. Furthermore, the base station 100 attempts to connect with the new route is considered may already provide a connection with the backhaul downstream. In that case, the side of the base station 100 requested a connection to the backhaul for a new route, if provided the connection to the backhaul to grant the request, significantly higher load is applied to the relevant base station 100 obtain.
[0145]
　Therefore, either side of the base station 100 to which a request to be connected to the backhaul for a new route, the degree load in the case of providing the connection to the backhaul to grant the request, predictable it is desirable.
[0146]
　<8.2. Technical features>
　technical features of this embodiment will be described assuming a situation shown in FIG. 19.
[0147]
　Figure 19 is a diagram for explaining the technical features according to the present embodiment. As shown in FIG. 19, each of the base station 100B (first corresponds to a base station) and a base station 100D (corresponding to the third base station) is connected connected to the core network 20, i.e. the backhaul . Further, the base station 100A is the backhaul, and connected using a wireless communication channel with the base station 100B, the connection between the backhaul according downstream of one or more base stations 100C (corresponding to a second base station) relaying using the wireless communication channel with the base station 100C. Note that, although the base station 100A is already connected base station 100B is an example the singular, the base station 100B may be plural. Under such circumstances, the base station 100A notifies the connection request to connect to the backhaul using a wireless communication channel with the base station 100D to base station 100D. Incidentally, the connection request, for example, may be transmitted using RRC signaling.
[0148]
　Connection request may include a variety of information to contribute to a determination of whether connection is possible by the base station 100D. Hereinafter, one example is explained.
[0149]
　The connection request may include information related to the base station 100C of the providing destination of connection to a backhaul. For example, information about the base station 100C included in the connection request is provided to the base station 100C, it may include a throughput of the connection between the backhaul using a wireless communication channel with the base station 100C. That is, the connection request may include information indicating the throughput of the backhaul that is provided to the base station 100C. Also, information about the base station 100C included in the connection request may include a number of base stations 100C. That is, the connection request, the base station 100A may include information indicating the number of downstream base station C that provides a connection to the backhaul. Based on such information, the base station 100D, it is possible to make a determination of whether connection is possible.
[0150]
　For example, the connection request may include information about the provider of the base station 100B of connection to the backhaul. For example, information about the base station 100B included in the connection request is provided from the base station 100B, may include throughput the connection between the backhaul using a wireless communication channel with the base station 100B. That is, the connection request may include information indicating a throughput backhaul provided from the base station 100B. Also, information about the base station 100B included in the connection request may include a number of base stations 100B. That is, the connection request may include information indicating the number of the upstream base station B offering the connection to the backhaul to the base station 100A. Based on such information, the base station 100D, it is possible to make a determination of whether connection is possible.
[0151]
　An example of information included in the connection request, shown in Table 7 below.
[0152]
[Table 7]

[0153]
　Here, the information of index 1 is an example of information related to the base station 100C of the providing destination of connection to a backhaul described above, the information of index 2, the base station 100B of the provider of the connection to a backhaul described above it is an example of information about.
[0154]
　On the other hand, the base station 100D is from the base station 100A (corresponding to the fourth base station), whether or not to permit the connection request to the backhaul using a wireless communication channel with the base station 100A, the connection request It determined based on the base station 100B information or information related to the base station 100C about contained. For example, base station 100D is either itself to such a load is acceptable, based on such or can maintain the throughput of the backhaul provided to the base station 100A and base station 100C, performs determination of whether connection is possible. The base station 100D is information indicating the determination result, and returns to the base station 100A.
[0155]
　Incidentally, information indicating the determination result, when the connection is allowed, the frequency resources to be used in a wireless connection (e.g., component carrier) may include information indicating a. Further, information indicating the determination result, for example of the downstream ten base stations 100C of base stations 100A, such as only three cars may be via the base station 100D, provides conditions for connection to a backhaul It may include information indicating a. Further, information indicating the determination result, for example may be transmitted using RRC signaling.
[0156]
　The base station 100A, when the connection is permitted, transmits the S1 setup request to MME21. The base station 100A, when you are connecting multiple routes to MME21, may transmit the S1 setup request via multiple paths.
[0157]
　On the other hand, the base station 100C may not transmit the S1 setup request. Base station 100C is because you are connected to the backhaul previously via the base station 100A. Of course, the base station 100C may send the S1 setup request.
[0158]
　By such a mechanism, each base station 100, while preventing overload, it is possible to connect to the backhaul at appropriate throughput.
[0159]
　Here, the base station 100A may or may be connected to the backhaul new route, there may be a case of cutting the existing route. Therefore, the quality of the backhaul base station 100A is provided, some may improve, sometimes worse. Therefore, the base station 100A is provided to the base station 100C, the information indicating the quality of the connection to the backhaul using a wireless communication channel with the base station 100C (hereinafter, also referred to as providing quality information), base station 100C It is notified to. That is, the base station 100A may provide quality information indicating quality of a backhaul to provide to the base station 100C, and notifies the base station 100C. For example, the base station 100A at a timing change in the quality of the backhaul is recognized to be provided to the base station 100C, and notifies the providing quality information. Such timing, and the timing at which the connection path is increased or decreased with the backhaul base station 100A.
[0160]
　Base station 100C refers to the provided quality information, recognizes that the quality of the backhaul provided has improved or deteriorated from the base station 100A. In response to this recognition, the base station 100C is connected to increase / decrease the number of other downstream base station 100 is a providing destination of the connection to the backhaul, or enhancement of backhaul line (the new backhaul It measures it is possible to take such attempt etc.).
[0161]
　Incidentally, providing quality information may be notified by means of RRC signaling or system information.
[0162]
　Providing quality information may include a variety of information. Hereinafter, one example is explained.
[0163]
　Providing quality information may include information indicating the throughput of the connection between the backhaul using a wireless communication channel with the base station 100C. That is, information indicating the quality of the connection to the backhaul may include information indicating the throughput of the backhaul that is provided to the base station 100C.
[0164]
　Providing quality information may include information indicating the delay time for the connection to the backhaul using a wireless communication channel with the base station 100C. That is, information indicating the quality of the connection to the backhaul may include information indicating the delay time of the backhaul is provided to the base station 100C.
[0165]
　An example of information included in the provided quality information, shown in Table 8 below.
[0166]
[Table 8]

[0167]
　Here, the index 1 information is an example of information indicating the throughput of the backhaul described above, the information of the index 2 is an example of information indicating the delay time of the backhaul described above.
[0168]
　On the other hand, the base station 100C may provide quality information provided from the base station 100A, it may be transmitted to the terminal device 200 to be connected to the base station 100C. For example, base station 100C may send including providing quality information of the base station 100A in the system information. Thus, the terminal device 200 can attempt to handover for example to a more backhaul other base station 100 is good quality.
[0169]
　Above has been described, according via the wireless communication path to the connected base station 100 to a backhaul, the flow of processing the connection between the new backhaul will be described with reference to FIGS. 20 and 21.
[0170]
　Figure 20 is a sequence diagram showing an example of a flow of a connection process with the new backhaul by a connected base station 100A to the backhaul performed in a cellular system 1 according to this embodiment. As shown in FIG. 20, in this sequence, a connected base station 100A to the backhaul Connected base station 100D to backhaul, MME21 and HSS22 are involved. First, the base station 100A includes information about providing source base station 100B of the connection between the information and the backhaul for the provision destination base station 100C of the connection to the backhaul, sending the S1 setup request to the base station 100D ( step S902). Then, the base station 100D is whether to provide the connection to the backhaul to the base station 100A, we are determined based on the information on the information and the base station 100B for the base station 100C received from the base station 100A (step S904) . If it is determined not to provide (S904 / NG), the base station 100D returns an S1 setup reject the base station 100A (step S906). On the other hand, if it is determined to provide (S904 / OK), the base station 100D transmits the S1 setup request to MME21 and HSS 22 (step S908), receives the S1 setup response sent back (step S910), transferred to the base station 100A (step S912).
[0171]
　Figure 21 is a sequence diagram showing an example of a flow of a connection process with the new backhaul by a connected base station 100A to the backhaul performed in a cellular system 1 according to this embodiment. As shown in FIG. 21, in this sequence, the base station 100A, the base station 100D, MME21 and HSS22 involved. First, the base station 100A includes information about providing source base station 100B of the connection between the information and the backhaul for the provision destination base station 100C of the connection to the backhaul, sending the S1 setup request to the base station 100D ( step S1002). Then, the base station 100D is whether to provide the connection to the backhaul to the base station 100A, we are determined based on the information on the information and the base station 100B for the base station 100C received from the base station 100A (step S1004) . Then, the base station 100D transmits the S1 setup request to MME21 and HSS 22 (step S1006), receives the S1 setup response sent back (step S1008), and transfers to the base station 100A (step S1010). Here, the base station 100D is to S1 setup response to be forwarded to the base station 100A, to allow them to connect to the backhaul via itself, providing condition information indicating the Suto downstream of the base station of the base station 100A include.
[0172]
　<< 9. Applications >>
　according to the disclosed technique is applicable to various products. For example, base station 100 may be implemented as a macro eNB or any type of eNB, such as small eNB (evolved Node B). Small eNB may pico eNB, such as micro eNB or Home (femto) eNB, or a eNB to cover smaller cells than macrocells. Alternatively, the base station 100 may be implemented as a base station for other types, such as NodeB or BTS (Base Transceiver Station). The base station 100 includes a main body (also referred to as a base station device) that controls the wireless communication, one or more RRH placed in a different location from the main body (Remote Radio Head) and may contain. Further, by different types of terminal to be described later to perform a temporary or semi-permanent base station function, it may operate as the base station 100.
[0173]
　In addition, for example, the terminal device 200, a smart phone, a tablet PC (Personal Computer), notebook PC, a portable game terminal, portable / dongle type mobile router or mobile terminal, such as a digital camera or a vehicle-mounted terminal such as a car navigation device, it may be implemented as. The terminal device 200 may be implemented as M2M (Machine To Machine) (also called MTC (Machine Type Communication) terminal) terminal that performs communications. Further, the terminal device 200, wireless communication module mounted on these terminals (e.g., an integrated circuit module consists of a single die) may be used.
[0174]
　　<9.1. Applications for the base station Example>
　　　(first applied example)
　FIG. 22 is a block diagram showing a first example of a schematic configuration of an eNB of the technology according to the present disclosure may be applied. eNB800 has one or more antennas 810, and the base station apparatus 820. Each antenna 810 and base station apparatus 820 may be connected to each other via a RF cable.
[0175]
　Each antenna 810, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the base station apparatus 820. eNB800 has a plurality of antennas 810 as shown in FIG. 22, a plurality of antennas 810, for example, may correspond to a plurality of frequency bands eNB800 uses. Although in FIG. 22 shows an example in which ENB800 has a plurality of antennas 810, ENB800 may have a single antenna 810.
[0176]
　The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823 and a wireless communication interface 825.
[0177]
　The controller 821 may be, for example, a CPU DSP, or to operate the various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821, the data from the plurality of baseband processor generates the bundled packets by bundling the generated bundled packets may be transferred. The controller 821, radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), executes the control such as the inflow control (Admission Control) or scheduling (Scheduling) Logical it may have a function. Further, the control may be performed in conjunction with the periphery of the eNB or the core network node. Memory 822 includes RAM and ROM, and stores a program executed, and various control data (e.g., terminal list, such as the transmission power data and scheduling data) by the controller 821.
[0178]
　Network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 via the network interface 823 may communicate with the core network node, or other eNB. In that case, the ENB800, the core network node, or other eNB, may be connected to one another by logical interfaces (e.g., S1 interface or X2 interface). Network interface 823 may be a wired communication interface, or a wireless communication interface for wireless backhaul. If the network interface 823 is a wireless communication interface, a network interface 823 may use a higher frequency band than the frequency band used for radio communication by the wireless communication interface 825.
[0179]
　Wireless communication interface 825, LTE supports either a cellular communication system such as (Long Term Evolution) or LTE-Advanced, via the antenna 810 to provide wireless connectivity to the terminal located in the cell of ENB800. Wireless communication interface 825 typically may include such baseband (BB) processor 826 and RF circuit 827. BB processor 826, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, each layer (e.g., L1, MAC (Medium Access Control), RLC (Radio Link Control) and PDCP (Packet Data Convergence Protocol)) to perform various signal processing. BB processor 826, instead of the controller 821 may include some or all of the logical functions described above. BB processor 826, a memory for storing a communication control program may be a module including a processor and associated circuitry to execute the program, the function of BB processor 826 may be changeable by the update of the program good. Further, the module may be a card or a blade is inserted into the slot of the base station apparatus 820, or may be a chip mounted on said card or the blade. On the other hand, RF circuit 827, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 810.
[0180]
　Wireless communication interface 825 includes a plurality of BB processor 826 as shown in FIG. 22, a plurality of BB processor 826 may, for example, correspond to a plurality of frequency bands eNB800 uses. The wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 22, a plurality of RF circuits 827 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 825 in FIG. 22 shows an example including a plurality of BB processor 826 and a plurality of RF circuits 827, a wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827 But good.
[0181]
　In eNB800 shown in FIG. 22, one or more components (backhaul control unit 151 and / or communication control unit 153) included in the processing unit 150 described with reference to FIG. 7, implemented in a wireless communication interface 825 it may be. Alternatively, at least some of these components may be implemented in the controller 821. As an example, ENB800 is part of a wireless communication interface 825 (e.g., BB processor 826) or the whole, and mounted / or module including a controller 821, even if the one or more components in the modules are mounted good. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed in ENB800, wireless communication interface 825 (e.g., BB processor 826) also and / or controller 821 executes the program good. As described above, ENB800 as a device comprising the one or more components may be the base station device 820 or the module is provided, a program for causing a processor as the one or more components are provided it may be. The readable recording medium recording the program may be provided.
[0182]
　Further, in eNB800 shown in FIG. 22, the radio communication unit 120 described with reference to FIG. 7, the wireless communication interface 825 (e.g., RF circuitry 827) may be implemented in. The antenna unit 110 may be implemented in the antenna 810. The network communication unit 130 may be implemented in the controller 821 and / or network interface 823. The storage unit 140 may be implemented in the memory 822.
[0183]
　　　(Second applied example)
　FIG. 23 is a block diagram showing a second exemplary configuration of an eNB of the technology according to the present disclosure may be applied. eNB830 has one or more antennas 840, the base station apparatus 850, and RRH860. Each antenna 840 and RRH860 may be connected to each other via a RF cable. The base station apparatus 850 and RRH860 may be connected to one another by high-speed line such as an optical fiber cable.
[0184]
　Each antenna 840, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by RRH860. eNB830 has a plurality of antennas 840 as shown in FIG. 23, a plurality of antennas 840, for example, may correspond to a plurality of frequency bands eNB830 uses. Although in FIG. 23 shows an example in which ENB830 has a plurality of antennas 840, ENB830 may have a single antenna 840.
[0185]
　The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855 and connection interface 857. Controller 851, a memory 852 and a network interface 853 is similar to the controller 821, a memory 822 and a network interface 823 described with reference to FIG. 22.
[0186]
　Wireless communication interface 855 supports any of the cellular communication system such as LTE or LTE-Advanced, via the RRH860 and antenna 840 to provide wireless connectivity to terminals located in a sector corresponding to RRH860. Wireless communication interface 855 typically may include such BB processor 856. BB processor 856, except that it is connected to the RF circuitry 864 of RRH860 through the connection interface 857 is similar to the BB processor 826 described with reference to FIG. 22. Wireless communication interface 855 includes a plurality of BB processor 856 as shown in FIG. 23, a plurality of BB processor 856 may, for example, correspond to a plurality of frequency bands eNB830 uses. Although the wireless communication interface 855 in FIG. 23 shows an example including a plurality of BB processor 856, a wireless communication interface 855 may comprise a single BB processor 856.
[0187]
　Connection interface 857 is an interface for base station apparatus 850 (the radio communication interface 855) connected to the RRH860. Connection interface 857 may be a communication module for communicating with the high-speed line which connects the base station apparatus 850 (wireless communication interface 855) and RRH860.
[0188]
　Further, RRH860 comprises a connection interface 861 and a wireless communication interface 863.
[0189]
　Connection interface 861 is an interface for connecting to the base station apparatus 850 RRH860 (wireless communication interface 863). Connection interface 861 may be a communication module for communicating with the high-speed line.
[0190]
　Wireless communication interface 863 sends and receives radio signals via an antenna 840. Wireless communication interface 863 may typically include an RF circuit 864. RF circuit 864, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 840. Wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 23, a plurality of RF circuits 864 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 863 in FIG. 23 shows an example including a plurality of RF circuits 864, a wireless communication interface 863 may comprise a single RF circuit 864.
[0191]
　In eNB830 shown in FIG. 23, one or more components (backhaul control unit 151 and / or communication control unit 153) included in the processing unit 150 described with reference to FIG. 7, the wireless communication interface 855 and / or it may be implemented in a wireless communication interface 863. Alternatively, at least some of these components may be implemented in the controller 851. As an example, ENB830 is part of a wireless communication interface 855 (e.g., BB processor 856) or the whole, and mounted / or module including a controller 851, even if the one or more components in the modules are mounted good. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed in ENB830, wireless communication interface 855 (e.g., BB processor 856) also and / or controller 851 executes the program good. As described above, ENB830 as a device comprising the one or more components may be the base station device 850 or the module is provided, a program for causing a processor as the one or more components are provided it may be. The readable recording medium recording the program may be provided.
[0192]
　Further, in eNB830 shown in FIG. 23, for example, wireless communication unit 120 described with reference to FIG. 7, the wireless communication interface 863 (e.g., RF circuitry 864) may be implemented in. The antenna unit 110 may be implemented in the antenna 840. The network communication unit 130 may be implemented in the controller 851 and / or network interface 853. The storage unit 140 may be implemented in the memory 852.
[0193]
　　<9.2. Applications> about the terminal apparatus
　　　(first applied example)
　FIG. 24 is a block diagram showing an example of a schematic configuration of the smartphone 900 technology according to the present disclosure may be applied. Smartphone 900, processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, a wireless communication interface 912,1 one or more of the antenna switch 915 comprises one or more antennas 916, bus 917, battery 918 and the auxiliary controller 919.
[0194]
　The processor 901 may be, for example, a CPU or SoC (System on Chip), which controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM, for storing programs and data executed by the processor 901. Storage 903 may include a storage medium such as a semiconductor memory or a hard disk. External connection interface 904 is an interface for connecting an external device such as a memory card or USB (Universal Serial Bus) device to a smart phone 900.
[0195]
　The camera 906 is, for example, an image pickup element such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. Sensor 907 may include, for example, the positioning sensor, a gyro sensor, the sensor group, such as a geomagnetic sensor and an acceleration sensor. The microphone 908 converts a voice inputted to the smartphone 900 to the audio signal. Input device 909, for example, a touch sensor, a keypad for detecting a touch to the screen of the display device 910, a keyboard includes a button or switch, and accepts an operation or information input from a user. Display device 910 has a screen such as a liquid crystal display (LCD) or organic light emitting diode (OLED) display, and displays the output image of the smartphone 900. Speaker 911 converts the audio signal output from the smart phone 900 to the audio.
[0196]
　Wireless communication interface 912 supports any of the cellular communication system such as LTE or LTE-Advanced, which executes wireless communication. Wireless communication interface 912 typically may include such BB processor 913 and RF circuit 914. BB processor 913, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, execute various signal processing for wireless communication. On the other hand, RF circuit 914, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 916. Wireless communication interface 912 may be a one-chip module that integrates BB processor 913 and RF circuit 914. Wireless communication interface 912 may include a plurality of BB processor 913 and a plurality of RF circuits 914 as shown in FIG. 24. Although the wireless communication interface 912 in FIG. 24 shows an example including a plurality of BB processor 913 and a plurality of RF circuits 914, a wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914 But good.
[0197]
　Further, the wireless communication interface 912, in addition to cellular communication systems, short-range wireless communication system, other types of wireless communication systems, such as the proximity wireless communication system or wireless LAN (Local Area Network) system may support, in this case, it may include a BB processor 913 and RF circuit 914 for each wireless communication system.
[0198]
　Each of the antenna switch 915, a plurality of circuits included in the wireless communication interface 912 (e.g., different circuits for wireless communication system) switches the connection destination of the antenna 916 between.
[0199]
　Each antenna 916, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the wireless communication interface 912. Smartphone 900 may have a plurality of antennas 916 as shown in FIG. 24. Although in FIG. 24 shows an example where the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0200]
　Moreover, the smartphone 900 may comprise an antenna 916 for each wireless communication system. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0201]
　Bus 917, a processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, connects the wireless communication interface 912 and the auxiliary controller 919 to each other . Battery 918 via a power supply line partially indicated by broken lines in the figure, supplies power to each block of the smartphone 900 shown in FIG. 24. Auxiliary Controller 919, for example, in the sleep mode, to operate the required minimum functionality of the smartphone 900.
[0202]
　In the smartphone 900 shown in FIG. 24, one or more components (acquisition unit 241 and / or communication control unit 243) included in the processing unit 240 described with reference to FIG. 8 is implemented in a wireless communication interface 912 it may be. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, a smart phone 900, a portion of the wireless communication interface 912 (e.g., BB processor 913) or the whole, equipped with a module containing the processor 901, and / or the auxiliary controller 919, the one or more components in the module There may be implemented. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed on the smartphone 900, a wireless communication interface 912 (e.g., BB processor 913), a processor 901, and / or auxiliary controller 919 is the program may be an execution. As described above, may be provided smart phone 900 or the module is a device provided with the one or more components, the program may be provided for causing a processor as the one or more components. The readable recording medium recording the program may be provided.
[0203]
　Further, in a smart phone 900 shown in FIG. 24, for example, wireless communication unit 220 described with reference to FIG. 8, the radio communication interface 912 (e.g., RF circuitry 914) may be implemented in. The antenna unit 210 may be implemented in the antenna 916. The storage unit 230 may be implemented in the memory 902.
[0204]
　　　(Second applied example)
　FIG. 25 is a block diagram showing an example of a schematic configuration of the car navigation device 920 technology according to the present disclosure may be applied. Car navigation device 920, processor 921, memory 922, GPS (Global Positioning System) module 924, sensor 925, data interface 926, content player 927, a storage medium interface 928, an input device 929, display device 930, a speaker 931, a wireless communication an interface 933,1 one or more of the antenna switch 936,1 or more antennas 937 and battery 938.
[0205]
　The processor 921 may be, for example, a CPU or SoC, controls the navigation functions and other functions of the car navigation device 920. Memory 922 includes RAM and ROM, for storing programs and data executed by the processor 921.
[0206]
　GPS module 924 uses the GPS signal received from the GPS satellites, measures the position of the car navigation device 920 (e.g., latitude, longitude and altitude). Sensor 925 is, for example, a gyro sensor may include sensors such as a geomagnetic sensor, and pressure sensor. Data interface 926 is connected to, for example, vehicle network 941 through a terminal (not shown), we obtain the data generated by the vehicle, such as vehicle speed data.
[0207]
　Content player 927, storage medium to be inserted into the storage medium interface 928 (e.g., CD or DVD) to reproduce the content stored in the. Input device 929 may, for example, a touch sensor for detecting a touch on the screen of the display device 930 includes a button or switch, and accepts an operation or information input from a user. Display device 930 has a screen such as an LCD or OLED display, and displays an image of content navigation function or reproducing. Speaker 931 outputs sound of content navigation function or reproducing.
[0208]
　Wireless communication interface 933 supports any of the cellular communication system such as LTE or LTE-Advanced, which executes wireless communication. Wireless communication interface 933 typically may include such BB processor 934 and RF circuit 935. BB processor 934, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, execute various signal processing for wireless communication. On the other hand, RF circuit 935, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 937. Wireless communication interface 933 may be a one-chip module that integrates BB processor 934 and RF circuit 935. Wireless communication interface 933 may include a plurality of BB processor 934 and a plurality of RF circuits 935 as shown in FIG. 25. Although the wireless communication interface 933 in FIG. 25 shows an example including a plurality of BB processor 934 and a plurality of RF circuits 935, a wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935 But good.
[0209]
　Further, the wireless communication interface 933, in addition to cellular communication systems, short-range wireless communication system may support other types of wireless communication systems, such as the proximity wireless communication system or wireless LAN system, in that case, the radio it may include a BB processor 934 and RF circuit 935 for each communication mode.
[0210]
　Each of the antenna switch 936, a plurality of circuits included in the wireless communication interface 933 (e.g., different circuits for wireless communication system) switches the connection destination of the antenna 937 between.
[0211]
　Each antenna 937, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the wireless communication interface 933. Car navigation device 920 may have a plurality of antennas 937 as shown in FIG. 25. Although the car navigation system 920 in FIG. 25 shows an example having a plurality of antennas 937, car navigation device 920 may have a single antenna 937.
[0212]
　Furthermore, car navigation device 920 may comprise an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.
[0213]
　Battery 938, via a feed line partially indicated by broken lines in the figure, supplies power to each block of the car navigation device 920 shown in FIG. 25. Further, the battery 938 accumulates electric power fed from the vehicle side.
[0214]
　In car navigation device 920 shown in FIG. 25, one or more components (acquisition unit 241 and / or communication control unit 243) included in the processing unit 240 described with reference to FIG. 8, the wireless communication interface it may be implemented in 933. Alternatively, at least some of these components may be implemented in the processor 921. As an example, a car navigation device 920, a portion of the wireless communication interface 933 (e.g., BB processor 934) equipped with a module that contains the or all and / or processor 921, the one or more components are mounted in the module it may be. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed on the car navigation device 920, a wireless communication interface 933 (e.g., BB processor 934) and / or processor 921 executing the program it may be. As described above, it may be a car navigation device 920 or the module is provided as an apparatus provided with the one or more components, be provided a program for causing a processor as the one or more components good. The readable recording medium recording the program may be provided.
[0215]
　Further, the car navigation apparatus 920 shown in FIG. 25, for example, wireless communication unit 220 described with reference to FIG. 8, the radio communication interface 933 (e.g., RF circuitry 935) may be implemented in. The antenna unit 210 may be implemented in the antenna 937. The storage unit 230 may be implemented in the memory 922.
[0216]
　Further, the technology according to the present disclosure includes one or more blocks of the car navigation device 920 described above, the vehicle network 941 may be implemented as an in-vehicle system (or vehicle) 940 that includes a vehicle-side module 942. Vehicle module 942, the vehicle speed, generates a vehicle data such as engine speed or failure information, and outputs the generated data to the vehicle network 941.
[0217]
　<< 10. Conclusion >>
　above with reference to FIGS. 1 to 25 have been described in detail an embodiment of the present disclosure.
[0218]
　For example, the base station 100 according to this embodiment is connected to the S1-MME interface and S1-U interface. S1-MME and the interface communication path communication path and S1-U interface to be formed is formed, including both wireless communication path formed between the first base station and the second base station. Thus, among a plurality of interfaces, it becomes possible to use a common wireless communication channel, it is possible to flexible construction of backhaul including a wireless communication channel.
[0219]
　Further, the base station 100 according to this embodiment, S1-MME backhaul include an interface to connect with a wireless communication channel with another base station 100, including information about the backhaul connected to system information Notice. Thus, the terminal device 200 or another base station 100 to be connected are or connected to the base station 100, to properly perform various determination of whether connection is possible or switching necessity concerning communication with the base station 100 it is possible.
[0220]
　Further, the base station 100 according to this embodiment performs authentication processing for connection to the backhaul using a wireless communication channel with another base station 100 connected to the backhaul. Thus, since only the base station 100 that is allowed and it is possible to connect to the backhaul, it is possible to suppress the wasteful consumption of backhaul including a wireless communication channel.
[0221]
　Further, the base station 100 according to this embodiment is connected to the backhaul using a radio communication path with the first base station connected to the backhaul, due to the downstream of the one or more second base station It relays the connection between the backhaul using a wireless communication channel with the second base station, a connection request for connecting to the backhaul using a radio communication path with the third base station third base to notify to the station. Accordingly, the third base station, a connection request it is possible to appropriately predict the load in the case of permit, it is possible to avoid a situation in which such a significantly higher load that has been permitted.
[0222]
　The terminal device 200 according to this embodiment, the backhaul containing S1-MME interface, which is notified from the base station 100 to connect with the wireless communication channel with another base station 100, included in the system information It performs a process based on the information about the backhaul. Thus, the terminal device 200, it is possible to perform appropriate processing such attempt handover in accordance with the quality, etc. of the backhaul base station 100 is connected.
[0223]
　Having described in detail preferred embodiments of the present disclosure with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such an example. It would be appreciated by those skilled in the art of the present disclosure, within the scope of the technical idea described in the claims, it is clear that to cover various modifications, combinations, for these It is also understood to belong to the technical scope of the present disclosure.
[0224]
　For example, in the above embodiment, MME, S1-MME has been described using the names in the LTE interface such, the technology according to the present embodiment can be similarly applied to NR. Further, in the above has been described with respect to S1-MME interface and S1-U interfaces, it may be applied a technique according to the present embodiment for the other interface. For example, base station 100 may notify, including information about the X2 interface in the system information.
[0225]
　Further, the above embodiments may be appropriately combined.
[0226]
　Further, the processing in the present specification has been described with reference to flowcharts and sequence diagrams may not be performed in the order always shown. Some process steps may be executed in parallel. Also may be additional processing steps employed, some of the processing steps may be omitted.
[0227]
　The effects described herein are not limiting be those that only illustrative or exemplary. In other words, the technology according to the present disclosure, together with the above effects, or instead of the above effects, can exhibit the apparent other effects to those skilled in the art from the description herein.
[0228]
　Also within the scope of the present disclosure the following configurations.
(1)
　processing unit that connects to a backhaul including a second logical interface between the first logical interface and the second control entity regarding the user plane between the first control entity regarding the control plane,
comprising a
　first the communication path, wherein the communication path logic interface is formed a second logical interface is formed, both including a wireless communication channel formed between the first base station and the second base station, base station.
(2)
　wherein the first communication path, wherein the communication path logic interface is formed a second logical interface is formed, including a different wireless communication paths with each other, the base station according to (1).
(3)
　In the first logical interface or wireless communication path to the second logical interface are formed, the number relay from the first control entity and the second control entity greater downstream side of the base station signals are multiplexed, the base station according to (1) or (2).
(4)
　said first logical interface or the base station on a communication path in which the second logical interface is formed, transferred from the signal or upstream from downstream to upstream signals to the downstream transparently, the ( the base station according to according to any one of 1) to (3).
(5)
　Wherein the processing unit, a wireless communication path for the first logical interface is formed using a wireless communication channel with frequency resources of lower frequency compared to the second logic interface, the (1) the base station according to any one of - (4).
(6)
　the processing unit is connected to said first logical interface that via the base station of the number smaller than that of the second logical interface, in any one of (1) to (5) the base station according.
(7)
　wherein the processing unit, the first impact of the radio channel due to rainfall for logical interfaces can be formed by using the frequency resources of small frequency, in any one of (1) to (6) the base station according.
(8)
　wherein the processing unit, the information regarding the communication path, wherein the first logical interface and the second logical interface of is formed, exchanges with other base stations, wherein (1) to (7) the base station of any one.
(9)
　wherein the processing unit to S1 setup request, delay requirements, SN (signal to noise ratio) required or include at least one of reliability requirements, according to any one of (1) to (8) base stations of.
(10)
　a backhaul including a first logical interface between the control entity regarding the control plane, and connected using a wireless communication channel with another base station, notifies including information relating to the backhaul to system information processing parts,
the base station comprising a.
(11)
　Wherein the processing unit, when the first logical interface is disconnected, until the first predetermined time expires, and transmits a predetermined signal to the terminal device, the base station according to (10).
(12)
　the predetermined signal, the reference signal comprises at least one of the synchronizing signal or the system information, the base station according to (11).
(13)
　wherein the processing unit, when the first predetermined time has expired, and stops the transmission of the predetermined signal to the terminal apparatus, a base station according to (11) or (12).
(14)
　the processing unit, when said first logical interface is disconnected, until or the first logical interface to a second predetermined time expires is restored, the uplink from the terminal device storing data, said (10) base station according to any one of - (13).
(15)
　wherein the processing unit, when the second predetermined time expires, to clear the accumulated the uplink data, when said before the expiry first logical interface is restored, the stored the uplink data transferring, the base station according to (14).
(16)
　wherein the processing unit, when the first logical interface is disconnected, to continue to provide service to the terminal apparatus using the communication enabled application server, any one of (10) - (15) the base station according to an item.
(17)
　It said information on backhaul includes information indicating the state of the control plane, the (10) base station according to any one of - (16).
(18)
　information relating to the backhaul includes information indicating the state of the user plane, the (10) to the base station according to any one of (17).
(19)
　the backhaul comprises a second logical interface between the control entity about the user plane,
　information information relating to the backhaul, indicating the delay time of the back hole corresponding to the frequency resource which the base station is provided including the (10) base station according to any one of - (18).
(20)
　information relating to the backhaul includes information indicating the other base station to be connected, said (10) base station according to any one of - (19).
(21)
　wherein the processing unit transmits the information indicating the delay time of the back hole corresponding to the frequency resource which the base station is provided to another base station, any one of (10) - (20) the base station according to.
(22)
　information relating to the backhaul includes information indicating whether it is possible provide a connection using a wireless communication path between the backhaul to other base stations, any one of (10) - (21) the base station according to an item.
(23)
　Processing unit, which performs an authentication process for connecting to the backhaul using a radio communication path with the first base station that is connected to the backhaul containing the logical interface with the control entity
the base station comprising a.
(24)
　wherein the processing unit performs the authentication processing as a terminal apparatus for radio communication connected to said first base station, a base station according to (23).
(25)
　wherein the processing unit to the connection request of the backhaul from the second base station, and returns information indicating whether connection is possible, the base station according to (23) or (24).
(26)
　wherein the processing unit, whether or not to permit a connection request to the backhaul from the second base station inquires to the control entity regarding the control plane, the base station according to (25).
(27)
　wherein the processing unit, notify the second base station included in the system information the authentication processing information indicating an unnecessary frequency resources, the base station according to (25) or (26).
(28)
　wherein the processing unit, the information which the authentication process indicates an unnecessary frequency resources, acquired using the authentication information that has been set, the base station according to (27).
(29)
　A backhaul comprising a logical interface with the control entity, the connect using a wireless communication channel with a first base station connected to the backhaul, the back by a downstream of the one or more second base station It relays the connection between the Hall using the wireless communication channel between the second base station, for connection to the backhaul using a radio communication path with the third base station connection request the third processing unit that notifies the base station,
the base station comprising a.
(30)
　the connection request includes information about the second base station, the base station according to (29).
(31)
　information about the second base station, including a throughput of connection to the provided to the second base station, the backhaul using a wireless communication path between the second base station, wherein the base station according to (30).
(32)
　said information relating to the second base station, including the number of the second base station, the base station according to (30) or (31).
(33)
　the connection request includes information about the first base station, the (29) base station according to any one of - (32).
(34)
　information about the first base station, including the provided from the first base station, throughput of the connection between the backhaul using a wireless communication path with the first base station, wherein the base station according to (33).
(35)
　The information about the first base station, including the number of the first base station, a base station according to (33) or (34).
(36)
　the processing unit determines whether to permit the connection request to the fourth and the backhaul using a wireless communication channel with the base station from the fourth base station, included in the connection request determining based on the first information on the base station or the second information related to the base station, the (29) to the base station according to any one of (35).
(37)
　wherein the processing unit, wherein is provided to the second base station, information indicating the quality of the connection between the backhaul using a wireless communication path between the second base station, the second It notifies the base station, the base station as claimed in any one of (29) to (36).
(38)
　the information indicating the quality includes information indicating the throughput, the base station according to (37).
(39)
　the information indicating the quality includes information indicating the delay time, the base station according to (37) or (38).
(40)
　wherein the processing unit notifies the information about the change in the quality by means of RRC signaling or system information, the (37) - the base station according to any one of (39).
(41)
　a backhaul including a first logical interface between the control entity regarding the control plane, notified from the base station to connect with the wireless communication channel with another base station, the backhaul included in the system information processing unit that performs, based on information about the process,
Terminal device comprising a.
DESCRIPTION OF SYMBOLS
[0229]
　1 cellular system
　11 cells
　20 core network
　30 Internet
　100 base station
　110 antenna unit
　120 radio communication unit
　130 network communication unit
　140 storage unit
　150 processing unit
　151 backhaul control unit
　153 communication control unit
　200 terminal apparatus
　210 antenna unit
　220 radio communication unit
　230 storage unit
　240 processing unit
　241 acquiring unit
　243 communication control unit

WE claims

[Requested item 1]
　Processing unit, to be connected to a backhaul including a second logical interface with the second control entity regarding the first logical interface and the user plane of the first control entity regarding the control plane
comprises a
　first logical interface There the communication path the second logical interface with the communication path to be formed is formed, including both wireless communication path formed between the first base station and the second base station, the base station.
[Requested item 2]
　Wherein the first communication path, wherein the communication path logic interface is formed a second logical interface is formed, including a different wireless communication paths with each other, the base station according to claim 1.
[Requested item 3]
　In the first logical interface or wireless communication path to the second logical interface are formed, the first control entity and the second signal of the base station of the relay number greater downstream from the control entity of are multiplexed, the base station according to claim 1.
[Requested item 4]
　Base station on a communication path to said first logical interface or the second logical interface of is formed, transferred from the signal or upstream from downstream to upstream signals to the downstream transparently, according to claim 1 base stations of.
[Requested item 5]
　Wherein the processing unit, a wireless communication path for the first logical interface, formed using a low frequency of the frequency resources as compared to the wireless communication path for the second logical interface, to claim 1 the base station according.
[Requested item 6]
　Wherein the processing unit is connected to said first logical interface that via the base station of the number smaller than that of the second logic interface, the base station according to claim 1.
[Requested item 7]
　Wherein the processing unit is formed using the frequency resources of the frequency are less affected by rainfall wireless communication path for the first logical interface, the base station according to claim 1.
[Requested item 8]
　Wherein the processing unit, the information regarding the communication path, wherein the first logical interface and the second logical interface of is formed, exchanges with other base stations, base station according to claim 1.
[Requested item 9]
　Wherein the processing unit to the S1 setup request, delay requirements, SN (signal to noise ratio) required or reliability requirements include at least one base station of claim 1.
[Requested item 10]
　A backhaul including a first logical interface between the control entity regarding the control plane, and connected using a wireless communication channel with another base station, the processing unit for notifying, including information relating to the backhaul to system information,
the base station equipped.
[Requested item 11]
　Wherein the processing unit, when the first logical interface is disconnected, until the first predetermined time expires, and transmits a predetermined signal to the terminal device, the base station according to claim 10.
[Requested item 12]
　The predetermined signal, the reference signal comprises at least one of the synchronizing signal or the system information, base station according to claim 11.
[Requested item 13]
　Wherein the processing unit, when the first predetermined time has expired, and stops the transmission of the predetermined signal to the terminal apparatus, a base station according to claim 11.
[Requested item 14]
　Wherein, when said first logical interface is disconnected, until or the first logical interface to a second predetermined time expires is restored, storing uplink data from the terminal device to the base station of claim 10.
[Requested item 15]
　Wherein the processing unit, when the second predetermined time expires, to clear the accumulated the uplink data, when said before the expiry first logical interface is restored, and transfers the accumulated the uplink data, the base station of claim 14.
[Requested item 16]
　Wherein the processing unit, when the first logical interface is disconnected, to continue to provide service to the terminal apparatus using the communication enabled application server, a base station according to claim 10.
[Requested item 17]
　Information relating to the backhaul includes information indicating the state of the control plane, the base station according to claim 10.
[Requested item 18]
　Information relating to the backhaul includes information indicating the state of the user plane, the base station according to claim 10.
[Requested item 19]
　The backhaul comprises a second logical interface between the control entity about the user plane,
　the information relating to the backhaul includes information indicating the delay time of the back hole corresponding to the frequency resource which the base station is provided, the base station of claim 10.
[Requested item 20]
　Information relating to the backhaul includes information indicating the other base station to be connected, the base station according to claim 10.
[Requested item 21]
　Wherein the processing unit transmits the information indicating the delay time of the back hole corresponding to the frequency resource which the base station is provided to another base station, the base station according to claim 10.
[Requested item 22]
　It said information on backhaul includes information indicating whether it is possible provide a connection using a wireless communication path between the backhaul to other base stations, base station according to claim 10.
[Requested item 23]
　Processing unit, which performs an authentication process for connecting to the backhaul using a radio communication path with the first base station that is connected to the backhaul containing the logical interface with the control entity
the base station comprising a.
[Requested item 24]
　Wherein the processing unit performs the authentication processing as a terminal apparatus for radio communication connected to said first base station, a base station according to claim 23.
[Requested item 25]
　Wherein the processing unit to the connection request of the backhaul from the second base station, and returns information indicating whether connection is possible, the base station according to claim 23.
[Requested item 26]
　Wherein the processing unit whether to permit the connection request to the backhaul from the second base station inquires to the control entity regarding the control plane, the base station according to claim 25.
[Requested item 27]
　Wherein the processing unit, notify the second base station included in the authentication process information system information indicating an unnecessary frequency resources, the base station according to claim 25.
[Requested item 28]
　Wherein the processing unit, the information which the authentication process indicates an unnecessary frequency resources, acquired using the authentication information that has been set, the base station according to claim 27.
[Requested item 29]
　A backhaul comprising a logical interface with the control entity, the connect using a wireless communication channel with a first base station connected to the backhaul, the back by a downstream of the one or more second base station It relays the connection between the Hall using the wireless communication channel between the second base station, for connection to the backhaul using a radio communication path with the third base station connection request the third processing unit that notifies the base station,
the base station comprising a.
[Requested item 30]
　It said connection request includes information regarding the second base station, the base station according to claim 29.
[Requested item 31]
　Information regarding the second base station, the is provided to the second base station, including the throughput the connection between the backhaul using a wireless communication path between the second base station, to claim 30 the base station according.
[Requested item 32]
　The information about the second base station, including the number of the second base station, the base station according to claim 30.
[Requested item 33]
　It said connection request includes information about the first base station, a base station according to claim 29.
[Requested item 34]
　Information about the first base station includes the provided from the first base station, throughput of the connection between the backhaul using a wireless communication path with the first base station, to claim 33 the base station according.
[Requested item 35]
　The information about the first base station, including the number of the first base station, a base station according to claim 33.
[Requested item 36]
　Wherein the processing unit whether to permit the connection request to the fourth and the backhaul using a wireless communication channel with the base station from the fourth base station, wherein the first included in the connection request determined based information about the base station or the second information related to the base station, the base station according to claim 29.
[Requested item 37]
　Wherein the processing unit, wherein is provided to the second base station, information indicating the quality of the connection between the backhaul using a wireless communication path between the second base station, the second to the base station It notifies base station of claim 29.
[Requested item 38]
　Information indicating the quality includes information indicating the throughput, the base station according to claim 37.
[Requested item 39]
　Information indicating the quality includes information indicating the delay time, the base station according to claim 37.
[Requested item 40]
　Wherein the processing unit notifies the information about the change in the quality by means of RRC signaling or system information, base station according to claim 37.
[Requested item 41]
　A backhaul including a first logical interface between the control entity regarding the control plane, notified from the base station to connect with the wireless communication channel with another base station, the information relating to the backhaul included in the system information processing unit that performs processing based,
terminal device comprising a.