Entitled: a radio communication system, a radio station, a wireless terminal, a network device, the bearer control method, and a computer-readable medium
Technical field
[0001]
　The present invention relates to a radio communication system in which radio station and the radio terminal performs communication by using a plurality of cells.
Background technique
[0002]
　Improved reduction of communication quality due to rapid increase in recent years in mobile traffic, and for the realization of higher speed communications, in 3GPP LTE (Long Term Evolution) wireless base station (eNode B: eNB) and a radio terminal (User Equipment: UE ) of carrier aggregation (Carrier Aggregation for communicating using multiple cells: CA) functional specification of have been made. Incidentally, UE available in CA cells are restricted to the cells of one eNB (ie, cell eNB is operated).
[0003]
　The procedure of the CA is described with reference to Figure 26 (Non-Patent Document 1). 17, UE indicates an example in which the first cell (Cell1) and the second cell (Cell2) is CA which is operated by the eNB. In step S1, UE and the eNB establishes a wireless connection in a first cell (RRC Connection Establishment). In step S2, UE receives the downlink data from the eNB in ​​the first cell (Downlink data on Cell1). Here, the first cell is the primary cell for the UE (Primary cell: PCell) become.
[0004]
　In step S3, eNB is, UE in the secondary cell (Secondary cell: SCell) it is determined that it is necessary to set, and the second cell set as SCell in PCell (RRC Connection Reconfiguration on Cell1 (including Configuration of Cell2 ( Secondary cell:. In SCell)) Step S4, UE is the setting of the second cell is completed, ie the ready to use the second cell is completed, according to, and sends a completion notification to the eNB (RRC Connection Reconfiguration Complete).
[0005]
　In step S5, eNB sends a use start notification of the second cell to the UE (Cell2 Activation). In step S6, UE utilizes the first and second cell simultaneously receives the downlink data (DL data on Cell1 and Cell2). Incidentally, UE can simultaneously be any available for downlink data reception the first and second cell in step S6. In other words, UE does not always need to receive downlink data in both the first and second cells. You can use the or both using either one of the first and second cells for the downlink data received, for example, downlink data volume or the UE is determined based on a service to use. Even if the UE transmits the uplink data in the second cell, and can be realized by the same procedure as shown in basically FIG.
[0006]
　UE for performing the CA, Physical layer and MAC (Medium Access Control) but having for each cell which is integrated at least a portion of the layer functions, RLC (Radio Link Control) layer above configuration is the same as the case without the CA It is. Therefore, the core network (Evolved Packet Core: EPC) is not aware whether the UE is CA.
[0007]
　Furthermore, heterogeneous networks (Heterogeneous Network: HetNet) in the environment, the concept of Inter-eNB CA for integrating multiple cells that are operated by different eNB has been proposed (Non-Patent Document 2). For example, the Inter-eNB CA, macro base station: a macro cell, which is operated by (Macro eNB MeNB) (Macro cell) and pico base station (Pico eNB: PeNB) may use the picocell (Pico cell), which is operated by It is considered.
[0008]
　Furthermore, using a wide macro cell coverage to the transmission and reception of the control system of the signal, such as UE mobility management of a relatively communication quality has also been proposed a method using a good picocells for transmitting and receiving data based on signals such as user data (Non-Patent Document 3).
CITATION
Non-Patent Document
[0009]
非特許文献1 : 3GPP TS 36.331 V11.0.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification", セクション 5.3.5, July 2012
非特許文献2 : 3GPP RWS-120046, Samsung Electronics, "Technologies for Rel-12 and Onwards", 3GPP TSG RAN Workshop on Rel-12 and Onwards Ljubljana, Slovenia, 11-12 June 2012
非特許文献3 : 3GPP RWS-120010, NTT DOCOMO, "Requirements, Candidate Solutions & Technology Roadmap for LTE Rel-12 Onward", 3GPP TSG RAN Workshop on Rel-12 and Onwards Ljubljana, Slovenia, 11-12 June 2012
Summary of the invention
Problems that the Invention is to Solve
[0010]
　In the conventional carrier aggregation (CA), since the radio terminal (UE) is performing communication using a plurality of cells which are operated by one of the radio stations (eNB), UE has been able to set a plurality of cells. On the other hand, in carrier aggregation of a plurality of cells which are operated by different eNB (Inter-eNB CA), to a plurality of cells that are operated by different eNB to be used simultaneously in a UE for reception or transmission of the user data, Data bearers for user data transfer needs to be set for each cell. However, the specification of the current LTE, UE may have set the data bearer in the cell of one of the eNB, it is impossible to set the same time the data bearer in a cell of another eNB for the same UE.
[0011]
　Incidentally, the term "data bearer" as used herein, a radio access network including eNB (Radio Access Network: RAN) and higher level network (EPC (Evolved Packet Core)) and an external network and the UE via the It means the bearer for transferring user packets between. Mobile communication system, generally, to create a data bearer for each UE. This is because the rapid switching of the packet transfer route (rearranged) is required to provide the UE's mobility. Data bearers in LTE, an EPS (Evolved Packet System) bearer. Data bearers in LTE, an EPS (Evolved Packet System) bearer.
[0012]
　The core network bearer external gateway which is arranged on the upper network (Packet Data Network Gateway: P-GW) and the data relaying node: a tunnel that is set between the (Serving Gateway S-GW), ie a logical transmission path, It is. External Gateway (P-GW) is a gateway node that is located on the boundary between the external network. Data relay node (S-GW) is a node that is located on the boundary with the RAN. The core network bearer in the LTE is a S5 / S8 bearer (ie, GTP (GPRS Tunneling Protocol) tunnels).
[0013]
　Radio access bearer is a bearer is set between the data relay node of the higher level network and the (S-GW) UE. Radio access bearer includes a bearer which is set between the RAN and the upper network, and the radio bearer. Bearer is set between the RAN and the upper network is set between the RLC (Radio Link Control) and RRC (Radio Resource Control) and is responsible RAN node (ie, LTE in eNB) to the upper network forwarding node. Radio bearer is set between the above-mentioned RAN node (eNB) UE in a RAN. Radio access bearers in LTE, an E-RAB (E-UTRAN Radio Access Bearer). For LTE, bearers are set between the RAN and the upper network is a S1 bearer (ie, GTP tunnel). In addition, radio bearer in LTE are EPS RB (Evolved Packet System Radio bearer).
[0014]
　One of the objects of the present invention is to realize a carrier aggregation of a plurality of cells which are operated by different wireless stations at the same time bearers in the cell a plurality of wireless stations for one of the wireless terminals (for example, S1 bearers, E -RAB, or EPS bearers) can set the wireless communication system, a radio station, it is to provide a wireless terminal, a communication control method, and a program.
Means for Solving the Problems
[0015]
　In a first aspect, a wireless communication system includes a first radio station to operate the first cell, the second radio station to operate the second cell, the wireless terminals, and the higher level network. It said wireless terminal has a function of establishing a second wireless connection in the second cell while the first wireless connection in the first cell has been established. The upper network is capable of transmitting or receiving a signal to and from the wireless terminal via the first and second radio stations. Furthermore, the upper network, as well as sets the control bearer for transmitting a control signal related to at least said wireless terminal between said first radio station and the upper network, the second radio station and the upper network It is configured to set the second bearer for transferring the user data relating to the wireless terminal among. The first radio station is configured to trigger the setting of the second bearer.
[0016]
　In a second aspect, the first radio station includes a radio communication unit for operating the first cell, and a communication control unit. The communication control unit includes a radio that has a function of establishing a second wireless connection in a second cell which is operated by the second radio station while the first wireless connection in the first cell has been established It controls communication with the terminal. Further, the communication control unit, as well as sets the control bearer for transmitting a control signal related to at least said wireless terminal between said the upper network the first radio station, the second radio station and the upper network It is configured to trigger the setting of the second bearer for transferring the user data relating to the wireless terminal among.
[0017]
　In a third aspect, the second radio station includes a radio communication unit for operating the second cell, and a communication control unit. The communication control unit includes a radio that has a function of establishing a second wireless connection in the second cell while the first radio connection in a first cell to be operated by the first radio station has been established It controls communication with the terminal. Further, the communication control section, the request or instruction from the first radio station, or the first in response to requests or instructions from the triggered upper network to the radio station, the upper network and the second It is configured to set the second bearer for transferring the user data relating to the wireless terminal among the radio stations.
[0018]
　In a fourth aspect, the radio terminal includes a radio communication unit and a communication control unit. The communication control unit receives the instruction to start the use of the second cell from the first radio station according to the first or second aspect described above, while the first wireless connection has been established in the second wireless connection is established, and is configured to control the wireless communication unit to receive or transmit user data in at least the second cell.
[0019]
　In a fifth aspect, a network device disposed in the upper network includes a control unit. Wherein, the second radio connection in the second cell, which is operated by the second radio station while the first radio connection in a first cell to be operated by the first radio station has been established It wants to control the settings of the bearer for the wireless terminal having an ability to establish. Wherein the control unit is configured to control the upper network to set a control bearer for transmitting or receiving a control signal related to at least the wireless terminal via the first wireless station in the first cell there. Furthermore, the control unit, in response to a setting request of bearers from said first of said first or second radio station is triggered by a radio station, the second radio station in the second cell and it is configured to control the upper network so as to set the second bearer for transmitting or receiving user data over.
[0020]
　In a sixth aspect, bearer control method in the first radio station to operate the first cell,
the second radio station while the first wireless connection has been established in (a) the first cell By for wireless terminal having a function of establishing a second wireless connection in the second cell to be operated, for sending a control signal related to at least said wireless terminal between said the upper network the first radio station Setting the control bearer, and
(b) to trigger the setting of the second bearer for transferring the user data relating to the wireless terminal between the second radio station and the upper network,
including.
[0021]
　In a seventh aspect, bearer control method in the second radio station to operate the second cell, from the first request or instruction or the first triggered upper network to the radio station from the radio stations request or response to the instruction, the ability to establish a second wireless connection in the second cell while the first wireless connection has been established in the first cell to be operated by the first radio station For a wireless terminal having a includes setting the second bearer for transferring the user data relating to the wireless terminal between the second radio station and the upper network.
[0022]
　In the eighth aspect, a communication control method in a wireless terminal receives the instruction to start the use of the second cell from the first radio station according to the first or second aspect described above, the first The second radio connection established between the wireless connection is established, it includes receiving or transmitting user data in at least the second cell.
[0023]
　In a ninth aspect, the bearer control method in a network device disposed in the upper network, the
die while the first wireless connection has been established in the first cell to be operated by (a) a first radio station For a wireless terminal having a function of establishing a second wireless connection in the second cell to be operated by the second radio station, for at least said wireless terminal via said first wireless station in the first cell to set a control bearer for transmitting or receiving control signals to control the upper network, and
(b) the bearer from the first or second radio station, which is triggered by the first radio station In response to the setting request, controlling the upper network so as to set the second bearer for transmitting or receiving user data related to the wireless terminal via the second radio station in the second cell ,
it includes.
[0024]
　In a tenth aspect, the program includes instructions for causing a bearer control method in a computer in the first radio station according to a sixth aspect of the described above.
[0025]
　In the eleventh aspect, the program includes instructions for causing a communication control method in a second radio station according to a seventh aspect of the described above into the computer.
[0026]
　In the eleventh aspect, the program includes instructions for causing a bearer control method for a computer in a wireless terminal according to an eighth aspect of the described above.
[0027]
　In a twelfth aspect, the program includes instructions for causing a bearer control method for a computer in a network system according to a ninth aspect of the described above.
Effect of the invention
[0028]
　According to the above-described manner, in order to realize the carrier aggregation of a plurality of cells which are operated by different wireless stations at the same time bearers in the cell a plurality of wireless stations for one mobile station (eg, S1 bearers, E-RAB, or is capable of wireless communication systems by setting the EPS bearer), the radio station, the radio terminal, it is possible to provide a communication control method, and program.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029]
[Figure 1] is a diagram showing an example configuration of a wireless communication system according to a first embodiment.
[Figure 2] is a diagram illustrating a configuration example of the first radio station according to the first embodiment.
[Figure 3] is a diagram showing a configuration example of the second radio station according to the first embodiment.
[Figure 4] is a diagram showing an example configuration of a wireless terminal according to the first embodiment.
[Figure 5] is a diagram illustrating a configuration example of a mobility management system according to the first embodiment.
[Figure 6] is a diagram illustrating a configuration example of a data relay apparatus according to the first embodiment.
[7] is a flowchart showing an operation example of the first radio station according to the first embodiment (procedure example 1).
[Figure 8] is a flowchart showing an operation example of the second radio station according to the first embodiment (procedure example 1).
[Figure 9] is a flowchart showing an operation example of the upper network according to the first embodiment (procedure example 1).
[Figure 10] is a flowchart showing an operation example of the wireless terminal according to the first embodiment (procedure example 1).
[Figure 11] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the first embodiment (procedure example 1).
[Figure 12] is a flowchart showing an operation example of the first radio station according to the first embodiment (Step Example 2).
[Figure 13] is a flowchart showing an operation example of the upper network according to the first embodiment (Step Example 2).
[Figure 14] is a flowchart showing an operation example of the second radio station according to the first embodiment (Step Example 2).
[Figure 15] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the first embodiment (Step Example 2).
[Figure 16] is a flowchart showing an operation example of the first radio station according to the first embodiment (Step Example 3).
[Figure 17] is a flowchart showing an operation example of the upper network according to the first embodiment (Step Example 3).
[Figure 18] is a flowchart showing an operation example of the second radio station according to the first embodiment (Step Example 3).
[Figure 19] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the first embodiment (Step Example 3).
[Figure 20] is a diagram showing an example configuration of a wireless communication system according to a second embodiment.
[Figure 21] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the second embodiment (Procedure Example 4).
[Figure 22] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the second embodiment (Procedure Example 5).
[Figure 23] is a sequence diagram showing an example of a bearer control method in a radio communication system according to the second embodiment (Procedure Example 6).
[Figure 24] is a diagram showing an example configuration of a wireless communication system according to a third embodiment.
[Figure 25] is a sequence diagram showing an example of a method for changing the user data path in a wireless communication system according to the second embodiment.
[Figure 26] is a sequence diagram showing an LTE carrier aggregation procedures (Background).
MODES FOR CARRYING OUT THE INVENTION
[0030]
　Hereinafter, specific embodiments will be described in detail with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, for the sake of clarity of description, duplicated explanation is omitted as appropriate.
[0031]

　Fig. 1 shows an example configuration of a wireless communication system according to this embodiment. Wireless communication system according to this embodiment includes a first radio station 1, the second radio station 2, the wireless terminal 3, and an upper network 4. STA 1 and 2, to operate the first cell 10 and second cell 20, respectively. STA 1 and 2, for example, a radio base station or a base station controller. The wireless terminal 3, while maintaining the first radio connection in the first cell 10 is configured to be able to establish a second wireless connection in the second cell 20. Thus, the wireless terminal 3, the signal (eg, user data, or control information) Multiple cells for transmission or reception of (eg, cell 10 and 20) can be used simultaneously. In other words, the wireless terminal 3, to support carrier aggregation of a plurality of cells which are operated by the different radio stations.
[0032]
　Incidentally, the expression "use of multiple cells at the same time", that can indeed limited to simultaneously receive or transmit signals in a plurality of cells which by no receiving or transmitting signals in both the plurality of cells It is that is actually ready to receive or transmit a signal in one of the cells, receiving or transmitting different signals in each of a plurality of cells, or the reception of a plurality of cell signal or The use in any of transmission, and the like.
[0033]
　Also the "establishment of the wireless connection" as used herein, for example, that the radio terminal and the radio station is communicable state, or a state in which the radio terminal and the radio station is to share information required for communication it is that, it corresponds to.
[0034]
　In addition, Figure 1 shows a HetNet environment. To be specific, the first cell 10 shown in Figure 1, has a wide coverage as compared to the second cell 20. In addition, Figure 1, the second cell 20 indicates a hierarchical cell structure arranged in the first cell 10. However, the cell arrangement shown in Figure 1 is merely an example. For example, the first and second cells 10 and 20 may have a coverage comparable. In other words, the radio communication system according to this embodiment, homogeneous networks (Homogeneous Network) may be applied to the environment.
[0035]
　Upper network 4 is a network managed by an operator that provides primarily mobile communication service. Upper network 4, mobility management of wireless terminal 3 (for example, location registration, location update), and bearer management (for example, bearer establishment, bearer configuration change, bearer release) control system that performs like (control plane: C-plane) functionality and, data transfer system for transferring user data in the radio terminal 3 with an external network (not shown) with the radio station 1 and 2: with a (user plane U-plane) functions. In other words, the higher the network 4 comprises at least one mobility management device is responsible for C-plane functionality, at least one data relaying apparatus carrying a U-plane functions. At least one data relaying apparatus includes a node located on the boundary between the RAN that includes the radio stations 1 and 2 may include an external gateway which is arranged on the boundary between the external network.
[0036]
　The cells 10 and 20 which are operated by different wireless stations 1 and 2 signals (eg, user data, or control information) to be available simultaneously in the wireless terminal 3 for the reception or transmission of, in this embodiment Wireless communication systems need to be set one at a time bearers in a plurality of multiple cells 10 and 20 of the radio stations 1 and 2 for the wireless terminal 3 (for example, control bearer, S1 bearer, E-RAB and EPS bearer) I have. For this purpose, the radio communication system of this embodiment operates as follows. In other words, the higher the network 4, and sets at least one control bearer for transmitting or receiving the first bearer, and the control signal to transmit or receive user data via the radio stations 1 in the cell 10, It is configured to set the second bearer for transmitting or receiving user data via the radio station 2 in the cell 20. The first bearer comprises a bearer for transferring user data between the host network 4 and the radio station 1 (for example, S1 bearer or E-RAB). The control bearer comprises a bearer for transmitting or receiving control signals between the host network 4 and the wireless station 1. The second bearer, including bearer for transferring user data between the host network 4 and the radio station 2 (eg, S1 bearer or E-RAB).
[0037]
　Furthermore, the radio station 1 is configured to trigger the setting of the second bearer. That is, in this embodiment, the wireless station 1 that is different from any of the wireless terminals 3 and the radio station 2 utilizes the second bearer triggers the setting of the second bearer. Upper network 4 may control the second bearer setting that is triggered by the wireless station 1. Thus, this embodiment, in order to realize the carrier aggregation of the cells 10 and 20 which are operated by different wireless stations 1 and 2, a bearer for the same time the radio terminal 3 in a plurality cells 10 and 20 (eg, control bearer , S1 bearer, it is possible to set E-RAB, or an EPS bearer).
[0038]
　In this embodiment, the second bearer may be a direct bearer between the radio station 2 and the upper network 4 may be a bearer via the radio station 1. In other words, the user data to the wireless terminal 3 transmits or receives via the radio station 2 in cell 20, may be transferred between the radio station 2 and the upper network 4 via the radio station 1.
[0039]
　Radio station 1, when it is communicating with the radio terminal 3 using the first bearer in the first cell 10, may be triggering the setting of the second bearer. Radio station 1, (a) that the radio terminal 3 detects the second cell 20, (b) that the predetermined condition relating to the traffic load of the first cell 10 is satisfied, and (c) the wireless terminal 3 that it has requested a given type of service, according to at least one, and may trigger the setting of the second bearer.
[0040]
　Then in the following, a description will be given of setting procedure of the second bearer. In one example, the wireless station 1 may trigger the wireless station 2 to set the second bearer. In this case, the wireless station 1, to trigger the second bearer settings may send a bearer setup request to the radio station 2. In yet another example, the wireless station 1, may trigger a host network 4 to set the second bearer. In this case, the wireless station 1, to trigger the second bearer settings may send a bearer setup request to the host network 4. Furthermore, there are several examples in the setting procedure of the second bearers to be started (initiate) in response to a trigger of the radio station 1. In the following, we outlined three examples of setting procedure of the second bearer (Procedure Example 1-3).
[0041]
　In step Example 1, the wireless station 1 by sending a bearer setup request to the radio station 2, to trigger the radio station 2 to set the second bearer. At this time, the wireless station 1, the terminal individual information of the wireless terminal 3 relating to the setting of the second bearer, the initial terminal information, and the non-access layer (Non-Access Stratum: NAS) sends at least one information that may be. Then, the wireless station 2, in response to a request of the radio station 1 transmits a setting request of the second bearer upper network 4 (that is, the mobility management device). Subsequently, the upper network 4, and performs the bearer setting in higher network 4 in response to the bearer setup request from the radio station 2, and notifies the bearer setting information for the second bearer to the radio station 2. Bearer setting information, for example, (a) the wireless terminal 3 of an address, (b) the radio station 2 and the upper network 4 and the end point identifier of the upper network 4 side regarding bearer between, (c) a second bearer QoS ( I, etc. Quality of Service) information. The radio station 2, based on the bearer setting information, and sets a bearer between the radio station 2 and the upper network 4 (for example, S1 bearer), the radio bearer between the wireless terminal 3 (for example, EPS RB ) set the. Radio station 2, after setting the second bearer may transmit a completion notification to the wireless station 1. In this case, the completion notification, the terminal individual information of the wireless terminal 3, the non-access layer information, and may include at least one bearer configuration information.
[0042]
　In step Example 2, the wireless station 1 by sending a bearer setup request to the upper network 4, triggers the upper network 4 to set the second bearer. Then, the higher the network 4, and it performs the bearer setting in higher network 4 in response to the bearer setup request from the wireless station 1, and notifies the bearer setting information for the second bearer to the radio station 1. Subsequently, the wireless station 1 transfers at least a portion of the received bearer setup information to the radio station 2. The radio station 2, based on the bearer setting information, and sets a bearer between the radio station 2 and the upper network 4 (for example, S1 bearer), the radio bearer between the wireless terminal 3 (for example, EPS RB ) set the. In the procedure Example 2, radio station 1, 2 or both of these higher-level network 4 or radio station, a terminal individual information of the wireless terminal 3 relating to the setting of the second bearer, initial terminal information, and of the non-access layer information out it may be transmitted to at least one.
[0043]
　In step Example 3, similarly to the procedure Example 2, the wireless station 1 by sending a bearer setup request to the upper network 4, triggers the upper network 4 to set the second bearer. Then, the higher the network 4, as well as the procedure Example 2, performs the bearer setting in the upper network 4 in response to the bearer setup request from the wireless station 1. However, in step Example 3, the upper network 4, the radio station 2 instead of radio station 1, to notify the bearer setting information for the second bearer. The radio station 2, based on the bearer setting information, and sets a bearer between the radio station 2 and the upper network 4 (for example, S1 bearer), the radio bearer between the wireless terminal 3 (for example, EPS RB ) set the. In the procedure Example 3, the radio station 1, 2 or both of these higher-level network 4 or radio station, a terminal individual information of the wireless terminal 3 relating to the setting of the second bearer, initial terminal information, and of the non-access layer information out it may be transmitted to at least one. In addition, higher-level network 4, the second set of higher-level network in the 4 on the bearer (for example, S1 bearer endpoint setting) after the completion, at least one of the terminal individual information of the wireless terminal 3 and the non-access layer information it may be directly transmitted to the wireless station 1, it may be transmitted to the radio station 1 through the radio station 2.
[0044]
　In these steps through Step Example 3 described above, the radio station 1 performs the setting of the radio bearer between the radio station 2 and the wireless terminal 3, such as the radio resource control information and radio resource setup information relating to the setting of the radio bearer and it may notify the wireless station 2.
[0045]
　In these steps 1 through Step Example 3 described above, the bearer setup information for the second bearer may comprise at least one of the listed information elements below.
Bearer information
and wireless terminal capability information
and wireless terminal identifier information
and selection network information
security information
[0046]
　Terminal individual information of the wireless terminal 3 relating to the setting of the second bearer may comprise at least one of the listed information elements below.
And wireless terminal capability information
and wireless terminal identifier information
and selection network information
bearer information
, radio resource control information
and wireless terminal movement history information
service information
[0047]
　The initial terminal information of the wireless terminal 3 relating to the setting of the second bearer may comprise at least one of the listed information elements below.
And wireless terminal identifier information
and selection network information
and wireless terminal area information
and wireless connection purposes (factors)
and non-access layer data
[0048]
　Non-access layer information of the wireless terminal 3 relating to the setting of the second bearer may comprise at least one of the listed information elements below.
And wireless terminal identifier information
and selection network information
and non-access layer data
[0049]
　The application destination of these procedure example 1-3, is a radio station that the first radio station 1 is operating a large cell of relatively coverage (management), the second radio station 2 is operating a small cell coverage ( management) to low-power radio stations (Low Power Node: if a LPN) but is considered, it is not limited thereto. The LPN, for example, a radio station having the same function as the radio stations 1, can be considered if a function as compared to the radio station 1 is small new type of network node (New Node). The second cell may be different new types of carriers (New Carrier Type) A new type different from the prior art to be a component of the cell (New Cell Type) from the conventional.
[0050]
　Subsequently hereinafter, the radio stations 1 and 2 according to this embodiment, the wireless terminal 3, and a description will be given of a configuration example of a node of a higher network 4 (mobility management device 5 and the data relaying device 6). Figure 2 is a block diagram showing a first configuration example of a radio station 1. The radio communication unit 11, an uplink signal transmitted from the wireless terminal 3 (uplink signal) received via an antenna. It received data processing unit 13, to restore the received uplink signal. reception data obtained is transferred via the communication unit 14 other network nodes, such data gateway or mobility management device of the upper network or other radio stations. For example, the uplink user data received from the wireless terminal 3 is transferred to the data relaying device of higher level network. Also, the control data of the non-access layer among the control data received from the wireless terminal 3 (Non-Access Stratum (NAS)) is transferred to the mobility management device of the upper network. Moreover, the reception data processing unit 13 receives the control data transmitted to the wireless station 2, or higher-level network 4 from the communication control unit 15, via the communication section 14 to which to send the radio station 2 or the upper network 4 .
[0051]
　Transmission data processing unit 12 obtains the wireless terminal 3 addressed to the user data from the communication unit 14, error correction coding, rate matching, and generates a transport channel by performing interleaving and the like. Furthermore, the transmission data processing unit 12 generates a transmission symbol sequence by adding control information to the data series of the transport channel. The radio communication unit 11, a carrier modulation based on the transmission symbol sequence, frequency conversion, the processing such as signal amplification is carried out to generate a downlink signal (downlink signal), and transmits it to the wireless terminal 3. Furthermore, the transmission data processing unit 12 receives the control data transmitted to the wireless terminal 3 from the communication control unit 15, and sends it to the wireless terminal 3 via the radio communication unit 11.
[0052]
　The communication control unit 15, signals to the cell 10 and 20 (eg, user data or control signals) to be available simultaneously in the wireless terminal 3 for receiving or sending the request to the wireless station 2, or higher-level network 4 by sending, to trigger the setting of the second bearer. That is, the communication control unit 15 starts the setting of the second bearer between the upper network and another radio station 2 for wireless terminal 3 belonging to the own cell (cell 10).
[0053]
　Figure 3 is a block diagram showing a second configuration example of a radio station 2. The wireless communication unit 21 shown in Figure 3, the transmission data processing unit 22, the function and operation of the reception data processing unit 23 and the communication unit 24, the corresponding elements of the radio station 1 shown in Figure 2, namely wireless communication Part 11 is the same as the transmission data processing unit 12, the reception data processing unit 13 and the communication unit 14.
[0054]
　The communication control unit 25 of the radio station 2, radio communicates with at least one radio station 1 and the higher level network 4 in a second bearer setup procedure is triggered by the wireless station 1, attributable to the cell 10 of the other radio stations 1 It sets the second bearer for the terminal 3.
[0055]
　Figure 4 is a block diagram showing a configuration example of the wireless terminal 3. Wireless communication unit 31 is different supports carrier aggregation of a plurality of cells managed by a radio station can be used multiple cells for transmission or reception of user data (for example, cell 10 and 20) at the same time . Specifically, the radio communication unit 31, via the antenna, to receive the downlink signals from the two or both the wireless station 1 or wireless stations. It received data processing unit 32 and sends it to restore the received data from the received downlink signal to the data control unit 33. The data control unit 33 is utilized in accordance with received data for that purpose. Also, transmission data processing unit 34 and the wireless communication unit 31 generates an uplink signal using the transmission data supplied from the data control unit 33, and transmitted to the two or both the wireless station 1 or wireless stations.
[0056]
　The communication control unit 35 of the wireless terminal 3, the signal (for example, user data or control signals) to the cells 10 and 20 for reception or transmission of the available simultaneously in the wireless communication unit 31, the radio station 1 and set for the second bearer in response to an instruction from the radio station 2 (eg, setting EPS RB, setting the EPS bearer) is performed. Thus, the wireless terminal 3 communicates with the wireless station 1 (that is, user transmit or receive, or both of these data) while, the wireless station 2 co communicable. In one example, the communication control unit 35 may receive an instruction to use the start of the second cell 20 from the first radio station 1.
[0057]
　Figure 5 is a block diagram showing a configuration example of a mobility management device 5 is arranged in the upper network 4. The communication unit 51, the radio station 1 and 2 and I communicate with the data relaying device 6 described later. Bearer setting control unit 52 communicates via a radio station 1 and 2 and the data relaying device 6 and the communication unit 51, controls the bearer setting in these devices. Specifically, the bearer setting control unit 52, in response to a setting request of the second bearer from the radio station 1 or 2, as well as requesting the bearer setting to the data repeater 6, bearer setup for the second bearer It will notify the information to the radio station 1 or radio station 2.
[0058]
　Typically, the wireless terminal 3, when it is connected to the upper network 4, a radio station in the upper network 4 (for example, wireless station 1) is managed in association with. For example, the mobility management unit 5, in order to identify the radio terminal 3 in control connection with the wireless station 1, a network identifier associated with the wireless station 1 (for example, MME UE S1AP ID) may be granted. One of the radio stations (for example, wireless station 1), the normal CA that are operating multiple cells, the higher the network 4, as usual, may be managing the radio terminal 3 in association with the radio station 1. However, if the CA using multiple cells 10 and 20 of different wireless stations 1 and 2, the upper network 4, may manage the radio terminal 3 in association with the plurality of wireless stations 1 and 2. Therefore, the mobility management device 5, to one of the wireless terminals 3, may be applied a plurality of network identifiers. The plurality of network identifiers, a first identifier for identifying the wireless terminal 3 in the control connection between the host network 4 and the wireless station 1, and the wireless terminal 3 in the control connection between the host network 4 and the radio station 2 and a second identifier for identifying. In addition, two types of network identifiers for the same wireless terminal 3 (for example, MME UE S1AP ID and eNB UE S1AP ID) may be set. In this case, first network identifier (for example, MME UE S1AP ID) one to the wireless terminal 3, the second network identifier (for example, eNB UE S1AP ID) to the upper network 4 and the wireless station 1 The one for the control connection between a further one of the control connections between the host network 4 and the radio station 2, can be set respectively.
[0059]
　Figure 6 is a block diagram illustrating a configuration example of a data relaying device 6 arranged on the upper network 4. The communication unit 61 includes first and second bearer between the radio station 1 and 2 (eg, S1 bearer) are set to transmit and receive user data to and from the radio station 1 and 2. The communication unit 64 sets the bearer between the other of the data relaying device or the external network in the upper network 4 (for example, S5 / S8 bearers or external bearer), while the other data relaying apparatus or an external network in me to send and receive user data.
[0060]
　Transmission data processing unit 62 receives the downlink user data from the communication unit 64, the two bearers of the upstream side and the downstream side (for example, S5 / S8 bearer and S1 bearer) for forwarding the downlink user data based on the correspondence between the . It received data processing unit 63 receives uplink user data from the communication unit 61, the two bearers (eg, S5 / S8 bearer and S1 bearer) for forwarding the uplink user data based on the correspondence relationship.
[0061]
　Bearer control unit 65, the signals and the mobility management device 5, under the control of the mobility management device 5, first and second bearer between the radio station 1 and 2 and the communication unit 61 (for example, S1 bearer), and other of data relay devices or external networks and between bearer (for example, S5 / S8 bearer, or external bearer) I set the.
[0062]
　Subsequently hereinafter, the signal (eg, user data or control information) to the cell 10 and 20 to be used simultaneously in the radio terminal 3 for receiving or sending, and sets the first and second bearer Specific examples of the procedure it will be explained. First, the procedure in Example 1 described above is described with reference to FIGS. 7-11, then the procedure Example 2 is described with reference to FIGS. 12-15, and finally the procedure example 3 will be described with reference to FIGS. 16-19 .
[0063]
(Procedure example 1)
　Figure 7 is a flowchart showing operations of the radio station 1 in step Example 1. In step S101, the wireless station 1 (the communication controller 15), by sending a setup request for a second bearer for the mobile station 3 belonging to the local cell 10 to the radio station 2, the setting of the second bearer It wants to trigger a. In step S102, the radio station 1 determines whether it has received an acknowledgment from the wireless station 2 to the request at step S101. If an acknowledgment is not obtained (NO in step S102), the radio station 1 ends the process in FIG. On the other hand, when receiving a positive response (YES in step S102), the radio station 1 determines the reception of the bearer setup completion notification from the radio station 2 (step S103). The completion notification indicating that the setting of the second bearer is completed. When receiving the bearer setup completion notification (YES in step S103), the radio station 1 transmits to the wireless terminal 3 in the cell 10 an instruction to activate the cell 20 (step S104).
[0064]
　Figure 8 is a flowchart showing operations of the radio station 2 in Step Example 1. At step S201, the radio station 2 (communication control unit 25) receives a message requesting the setting of a second bearer for communicating in a wireless terminal 3 and the cell 20 belonging to the cell 10 from the wireless station 1. At step S202, the wireless station 2 determines whether to grant the request from the radio station 1. For example, the wireless station 2, if it is not possible to ensure sufficient radio resources for communicating with the wireless terminal 3 to the load cell 20 is high, may reject the request from the radio station 1. STA 2 transmits a negative acknowledgment if it rejects the request from the wireless station 1 to the wireless station 1 (step S203), and transmits an acknowledgment to the radio station 1 in the case of permission (step S204).
[0065]
　If you grant a request from the wireless station 1, radio station 2, to prepare for communication in the cell 20 of the wireless terminal 3. Specifically, in step S205, the radio station 2 requests the setting of a second bearer for the wireless terminal 3 to the upper network 4 (mobility management unit 5). At step S206, the wireless station 2 determines whether it has received the bearer setup information from the upper network 4. When receiving the bearer setting information (YES in step S206), the wireless station 2, bearer setup for the second bearer based on the bearer setting information (eg, S1 bearer setup, EPS RB sets) performed. The radio station 2 transmits an acknowledgment of the bearer setting for the upper network 4 (step S207). Finally, the wireless station 2 notifies the setting completion of the second bearer to the radio station 1 (step S208). Confirmation of the bearer setting, for example, a bearer endpoint identifier for the downlink data reception has been set in the wireless station 2.
[0066]
　Figure 9 is a flowchart showing the operation of the upper network 4 in Step Example 1. At step S301, the host network 4 (mobility management unit 5) receives a setting request of a second bearer for the wireless terminal 3 from the wireless station 2. Upper network 4, in response to the request in step S301, and transmits the bearer setting information to the second radio station 2 (step S302). At step S303, the upper network 4 determines reception of a bearer setup for acknowledgment from the second radio station 2. When receiving the acknowledgment of the bearer setup (YES in step S303), the higher the network 4, and based on this acknowledgment, it updates the bearer setting in the data repeater 6 and completes the setting of the second bearer (step S304).
[0067]
　Figure 10 is a flow chart showing the operation of the wireless terminal 3 in Step Example 1. At step S401, the wireless terminal 3 (a communication control unit 35), an instruction to use the start of the second cell 20 is received in the first cell 10 from the wireless station 1. At step S402, the wireless terminal 3, in response to start of use of the instruction, the second cell 20 is set. Specifically, the wireless terminal 3, settings required for sending or receiving user data in a second bearer (eg, address setting of the wireless terminal 3, EPS bearer endpoint settings, radio bearer configuration, etc.) the line Ebayoi. At this time, the wireless station 1 may further transmit and radio resource control setting information (Radio Resource Control (RRC) Configuration) and radio resource setup information (Radio Resource Configuration). In step S403, the wireless terminal 3 reports the setting completion of the second cell 20 to the first radio station 1.
[0068]
　11 is a sequence diagram showing an overall procedure example 1. At step S501, the wireless terminal 3, the radio stations 1, and higher level network 4, it sets a control bearer for transmitting and receiving control information via the wireless station 1 in the cell 10. Furthermore, the wireless terminal 3, the radio stations 1, and higher level network 4 may be via a radio station 1 sets the first bearer for transmitting and receiving user data in the cell 10. In step S502, the radio station 1, to request the setting of the second bearer for the wireless terminal 3 to the radio station 2. The second bearer, a bearer for transmitting and receiving user data via the cell 20 and the radio station 2 (eg, E-RAB) are, for transferring user data between the host network 4 and the radio station 2 bearer (for example, S1 bearer) it includes. In step 503, the wireless station 2 sends an acknowledgment or a negative response to the bearer setup request to the radio station 1. When transmitting the acknowledgment in step S503, the wireless station 2 sends a setup request for a second bearer for upper network 4. Upper network 4 (mobility management unit 5), in response to a request from the wireless station 2, and controls the setting for the second bearer in the data repeater 6. Then, in step S505, the host network 4 (mobility management unit 5) instructs the setting for the second bearer to the radio station 2. The instruction includes a bearer configuration information for the second bearer.
[0069]
　Radio station 2, the settings for the second bearer based on the bearer setting information, and sends an acknowledgment of the bearer setting for the upper network 4 (step S506). Furthermore, the radio station 2 notifies the setting completion of the second bearer to the radio station 1 (step S507). Wireless station 1, depending on the setting completion of the second bearer, sending a use start notice of the second cell 20 in the cell 10 to the wireless terminal 3 (step S508). Finally, in step S509, the wireless terminal 3 transmits a setting completion report of the cell 20 to the radio station 1.
[0070]
　In step S502 in FIG. 11, the radio station 1, a may transmit the following information when performing a bearer setup request. This information along with the request may be transmitted (that is, in the same message), or may be sent in a separate message.
· Terminal individual information: for example, a wireless terminal capability information, wireless terminal identifier information, select network information, bearer information, radio resource control information, wireless terminal movement history information or service information, or any combination thereof;
· initial terminal information : for example, a wireless terminal identifier information, select network information, wireless terminal area information, wireless connection purposes (factor), or non-access layer data, or any combination thereof;
and non-access layer information: for example, a wireless terminal identifier information, Selection network information or non-access stratum data, or any combination thereof.
[0071]
　In step S507 in FIG. 11, the radio station 2 may transmit the following information when the setting completion notification of the second bearer. This information together with the notice may be transmitted (that is, in the same message), or may be sent in a separate message.
· Terminal individual information: for example, a wireless terminal capability information, wireless terminal identifier information, select network information, bearer information, radio resource control information, wireless terminal movement history information or service information, or any combination of these;
and non-access layer Information: For example, a wireless terminal identifier information, select network information, or non-access layer data, or any combination of these.
[0072]
　In step S505 in FIG. 11, upper network 4, when performing the setting instruction of the second bearer, (a) bearer information, (b) the wireless terminal capability information, (c) a wireless terminal identifier information, (d) Selection network information, or (e) security information, or transmit any combination of these as a bearer setup information. This information along with the instruction may be transmitted (that is, in the same message), or may be sent in a separate message.
[0073]
(Procedure Example 2)
　FIG. 12 is a flowchart showing operations of the radio station 1 in step Example 2. In step S601, the wireless station 1 (the communication controller 15), by sending a setup request for a second bearer for the mobile station 3 belonging to the local cell 10 to the upper network 4, the setting of the second bearer It wants to trigger a. In step S602, the radio station 1 receives the setting instruction of the second bearer from the upper network 4. At step S603, the radio station 1 instructs the setting of a second bearer for the mobile station 3 to the radio station 2. In step S604, the radio station 1 determines the reception of the bearer setup completion notification from the radio station 2. When receiving the bearer setup completion notification (YES in step S103), the radio station 1 notifies the setting completion of the second bearer to the upper network 4. Furthermore, the radio station 1 transmits to the wireless terminal 3 in the cell 10 an instruction to activate the cell 20 (step S606). At this time, the wireless station 1 may further transmit and radio resource control setting information (RRC Configuration) and radio resource configuration information (Radio Resource Configuration).
[0074]
　Figure 13 is a flowchart showing the operation of the upper network 4 in step Example 2. At step S701, the host network 4 (mobility management unit 5) receives a setting request of a second bearer for the wireless terminal 3 from the wireless station 1. At step S702, the upper network 4 transmits a setting instruction of a second bearer to the radio station 1. The setting instruction may include a bearer configuration information for the second bearer. At step S703, the upper network 4 determines reception of a bearer setup completion notification from the wireless station 1. Completion notification of the bearer setting, for example, a bearer endpoint identifier for the downlink data reception has been set in the wireless station 2. Upper network 4, based on the completion notification may update the bearer setting in the data repeater 6.
[0075]
　Figure 14 is a flowchart showing operations of the radio station 2 in Step Example 2. In step S801, the radio station 2 (communication control unit 25) receives the setting instruction of a second bearer from the radio station 1. The setting instruction may include a bearer configuration information for the second bearer. In step S802, the wireless station 2, bearer setup for the second bearer based on the bearer setting information (eg, S1 bearer setup, EPS RB sets) performed. In step S803, the radio station 2 notifies the setting completion of the second bearer to radio station 1.
[0076]
　Operation of the wireless terminal 3 in step Example 2 is similar to the operation of procedure example 1 shown in FIG.
[0077]
　15 is a sequence diagram showing an overall procedure example 2. Processing in step S501 in FIG. 15 are the same as step S501 of the procedure example 1 shown in FIG. In step S902, the radio station 1, to request a second bearer for the wireless terminal 3, that is bearer via the cell 20 and the radio station 2 to transfer the user data, the setting of the upper network 4. Upper network 4 (mobility management unit 5), in response to a request from the wireless station 2, and controls the setting for the second bearer in the data repeater 6. Then, in step S903, the host network 4 (mobility management device 5) instructs the setting for the second bearer to radio station 1. The instruction includes a bearer configuration information for the second bearer.
[0078]
　In step S904, the radio station 1 instructs the setting of the second of the bearer to the radio station 2. Radio station 2, the settings for the second bearer based on an instruction from the wireless station 1, and transmits a completion notification of the bearer setting for the radio station 1 (step S905). In step S906, the radio station 1 transmits a setting completion notification of the second bearer to the upper network 4. Processing in steps S508 and S509 in FIG. 15 are similar to steps S508 and S509 in Step Example 1 shown in Fig.
[0079]
　Radio station 1 may transmit the following information when performing a bearer setting request in step S902 in FIG. 15. Furthermore, the radio station 1 may transmit the information even when an instruction for bearer setup to the radio station 2 at step S904 in FIG. 15. This information along with the request may be transmitted (that is, in the same message), or may be sent in a separate message.
· Terminal individual information: for example, a wireless terminal capability information, wireless terminal identifier information, select network information, bearer information, radio resource control information, wireless terminal movement history information or service information, or any combination thereof;
· initial terminal information : for example, a wireless terminal identifier information, select network information, wireless terminal area information, wireless connection purposes (factor), or non-access layer data, or any combination thereof;
and non-access layer information: for example, a wireless terminal identifier information, Selection network information or non-access stratum data, or any combination thereof.
[0080]
　Upper network 4, when performing the setting instruction of the second bearer in step S903 in FIG. 15, (a) bearer information, (b) the wireless terminal capability information, (c) a wireless terminal identifier information, (d) selecting a network information, or (e) security information, or may be transmitted any combination thereof as bearer configuration information. This information along with the instruction may be transmitted (that is, in the same message), or may be sent in a separate message.
[0081]
(Procedure Example 3)
　Figure 16 is a flowchart showing operations of the radio station 1 in step Example 3. Processing in step S601 in FIG. 16 is the same as step S601 of the procedure example 2 of FIG. In step Example 3, in response to a setting request of the second bearer from the radio station 1 to the upper network 4, upper network 4 communicates with the radio station 2, and sets the second bearer. Therefore, in step S1002, the radio station 1 determines whether the upper network 4 receives a setting completion notification of the second bearer. When receiving the completion notification (YES in step S1002), the wireless station 1 transmits to the wireless terminal 3 a signal indicating a use start of the second cell 20 in the first cell 10 (step S1003). At this time, the wireless station 1, further Radio Resource Control (RRC Configuration) information and radio resource configuration information (Radio Resource Configuration) etc. may be transmitted.
[0082]
　17 is a flowchart showing the operation of the upper network 4 in step Example 3. Processing in step S701 in FIG. 17 are the same as step S701 in the procedure Example 2 in Figure 13. In step S1102, the host network 4 (mobility management device 5) transmits a setting instruction of the second bearer to radio station 2. The setting instruction may include a bearer configuration information for the second bearer. In step S1103, the higher the network 4 determines reception of a bearer setup completion notification from the wireless station 2. Completion notification of the bearer setting, for example, a bearer endpoint identifier for the downlink data reception has been set in the wireless station 2. Upper network 4, based on the completion notification may update the bearer setting in the data repeater 6. When receiving the completion notification (YES in step S1103), the higher the network 4 informs the completion of the bearer setup to the radio station 1 (step S1104).
[0083]
　Figure 18 is a flowchart showing operations of the radio station 2 in Step Example 3. In step S1201, the radio station 2 (communication control unit 25) receives the setting instruction of the second bearer from the upper network 4. The setting instruction may include a bearer configuration information for the second bearer. Step S802 in FIG. 18 is similar to that of Figure 14. That is, the wireless station 2, bearer setup for the second bearer based on the bearer setting information (eg, S1 bearer setup, EPS RB sets) performed. In step S1203, the radio station 2 notifies the setting completion of the second bearer in the upper network 4.
[0084]
　Operation of the wireless terminal 3 in step Example 3 is similar to the operation of procedure example 1 shown in FIG.
[0085]
　19 is a sequence diagram showing an overall procedure example 3. Processing in steps S501 and S902 in FIG. 19 are the same as steps S501 and S902 of the procedure Example 2 shown in FIG. In step S1303, the host network 4 (mobility management device 5) instructs the setting for the second bearer to radio station 2. The instruction includes a bearer configuration information for the second bearer. In step S1304, the radio station 2, the settings for the second bearer based on an instruction from the upper network 4, and transmits a completion notification of the bearer setting to the higher network 4. In step S1305, the host network 4 transmits a setting completion notification of the second bearer to radio station 1. Processing in steps S508 and S509 in FIG. 19 are similar to steps S508 and S509 in Step Example 1 and Step Example 2 shown in FIGS. 11 and 15.
[0086]
　Upper network 4, when performing the second bearer setup command at step S1303 in FIG. 19, (a) bearer information, (b) the wireless terminal capability information, (c) a wireless terminal identifier information, (d) selecting a network information, or (e) security information, or may be transmitted any combination thereof as bearer configuration information. This information along with the instruction may be transmitted (that is, in the same message), or may be sent in a separate message.
[0087]

　In the present embodiment, a description is given of an example of applying the first embodiment described above in a 3GPP LTE system. STA 1 and 2 correspond to the eNB, the radio terminal 3 corresponds to the UE, the higher the network 4 corresponds to a core network (EPC). In addition, the mobility management unit 5 included in the higher level network 4 corresponds to the MME (Mobility Management Entity), the data relaying device 6 corresponds to a combination of the S-GW or S-GW and P-GW. Here, between the radio station (ie, eNB between) transmission and reception of information are, may be used X2 is a direct interface may be used S1 is an interface through the core network, or, new defined interface are (eg, X3) may also be used. In addition, the radio station (ie, eNB) and an upper network (ie, EPC) transmission and reception of information between the can may be used to which is a direct interface S1 (S1-MME, also referred to as S1-U), a new It may be used to interface to be defined. The first and second bearer, for example, S1 bearer corresponds to the E-RAB or EPS bearer. Control bearer, for example, UE-associated logical S1-connection, S1-MME, or a radio station (ie eNB) signaling radio bearer for transmitting the C-plane control information to the wireless terminal (ie UE) through (Signaling Radio Bearer: it corresponds to the SRB).
[0088]
　A wireless terminal (UE) 3 supports carrier aggregation of a plurality of cells which are operated by different wireless stations (eNB) (Inter-eNB CA). In the "Inter-eNB CA" here actually different eNB cell signals (eg, user data and control information) at the same time limited to receiving or transmitting no means both in cells of different eNB signals receiving or has become a ready to transmit is actually able to receive or transmit signals in the cell of one of the eNB, to receive or transmit signals of different types in each cell of a different eNB and or, it includes it to use each cell of different eNB to any of the reception or transmission of signals, and the like.
[0089]
　In the following, a radio station 1 and 2 eNB1 and 2, the wireless terminal 3 UE3, higher network 4 EPC4, the mobility management device 5 MME5, explaining a data relay device 6 as S-GW6. Figure 20 is a block diagram showing a configuration example of a radio communication system according to this embodiment.
[0090]
　As already mentioned, in LTE, usually, a bearer necessary for transmitting and receiving user data set is triggered by the UE itself. However, UE3 is established already the first wireless connection in the first cell of eNB1 (RRC Connection Established), if you have completed the setting of the bearer, and even the second of the bearer in the second cell of other eNB2 It is, UE3 of the processing load becomes very large to carry out the setting of. In contrast, in the present embodiment, the trigger setting eNB1 of the second bearer, and performs the setting of the bearer in the radio network side including the eNB1 and 2 and EPC4. Thus, this embodiment can reduce the UE3 processing load required to perform the carrier aggregation of the cells 10 and 20 which are operated by different eNB1 and 2.
[0091]
　And whether to use eNB1 and eNB2 for downlink user data transmission, for example, it may be determined in accordance with the service type and the required QoS (or QCI). Furthermore, the control system of the signal (Control Plane (CP) signal) is sent from the eNB1, the user data based on the signal (User Plane (UP) signal) may be sent from eNB2.
[0092]
　Setting Procedure specific secondary bearer in the present embodiment, it may be the same as the first embodiment. That, eNB1 is, by sending a bearer setup request to the eNB2 or EPC4, triggers the setting of the second bearer. EPC4 may control the second bearer setting that is triggered by eNB1. Thus, this embodiment is different from eNB1 and in order to realize the carrier aggregation of the cells 10 and 20 which are operated by two, at the same time bearers for UE3 in multiple cells 10 and 20 (eg, a control bearer, S1 bearer, E-RAB, or an EPS bearer) can be set.
[0093]
　Setting of the second bearer may be performed in accordance with one of the procedures Examples 3-6 that correspond to the steps Examples 1 to 3 described in the first embodiment. Step Example 4 corresponds to a procedure example 1 of the first embodiment. In Step Example 4, eNB1 is, by sending a bearer setup request to the eNB2, triggers the eNB2 to set the second bearer. In this case, eNB1 is, UE3 of terminal individual information related to the setting of the second bearer (UE Context information), initial terminal information (Initial UE message), and at least one of the non-access layer information (NAS information) It may be transmitted. Then, eNB2 sends a request for setting the second bearer EPC4 (MME5). EPC4, as well make the bearer setting in EPC4, to notify the bearer setting information for the second bearer (Bearer Configuration information) to eNB2. Then, eNB2, based on the bearer setting information, the bearer between the eNB2 and EPC4 (eg, S1 bearer) as well as setting and sets a radio bearer between the UE3 (eg, EPS RB). eNB2 after setting of the second bearer may transmit a completion notification to eNB1. In this case, notification of completion may include UE3 terminal individual information, and at least one of the non-access stratum information.
[0094]
　Step Example 5 corresponds to a procedure example 2 of the first embodiment. In Step Example 5, eNB1 is, by sending a bearer setup request to EPC4, triggers the PEC4 to set the second bearer. EPC4, as well make the bearer setting in EPC4 depending on the bearer setting request from eNB1, to notify the bearer setting information for the second bearer (Bearer Configuration information) to eNB1. eNB1 transfers at least a portion of the bearer setting information to eNB2. eNB1 is, in EPC4 or eNB2 or both of these, UE3 of terminal individual information related to the setting of the second bearer (UE Context information), initial terminal information (Initial UE message), and the non-access layer information (NAS information) It may be transmitted at least one of.
[0095]
　Step Example 6 corresponds to a procedure example 3 of the first embodiment. In Step Example 6, similarly to the procedure Example 3, eNB1 is, by sending a bearer setup request to EPC4, triggers the EPC4 to set the second bearer. EPC4, as well make the bearer setting in EPC4, to notify the bearer setting information for the second bearer (Bearer Configuration information) to eNB2. eNB2, based on the bearer setting information set for the second bearer (E-RAB Setup) do. In the procedure example 6, eNB1 is, in EPC4 or eNB2 or both of these, the wireless terminal 3 of the terminal individual information related to the setting of the second bearer (UE Context information), initial terminal information (Initial UE message), and non- It may be transmitted at least one of the access layer information (NAS information). In addition, EPC4, the second set in the EPC4 on bearer (for example, S1 bearer endpoint setting) after the completed, at least one of UE3 of terminal individual information and non-access layer information directly to eNB1 transmission may be, it may be transmitted to the eNB1 through the eNB2.
[0096]
　In the procedure Example 4 - Procedure Example 6 above, eNB1 performs setting of a radio bearer between the eNB2 and UE3, the radio resource control information related to the setting of the radio bearer (RRC Configuration) and radio resource setup information (Radio Resource Configuration) and the like may be notified to eNB2.
[0097]
　In the procedure Example 4 - Procedure Example 6 above, the bearer setting information may include at least one of the listed information elements below.
Bearer information (Bearer information): For example, E-RAB ID, E-RAB Level QoS Parameters, or UL GTP Tunnel Endpoint ID, or any combination of these;
and wireless terminal capability information (UE capability information): for example, UE radio access capability, UE network capability, or UE security capability, or any combination of these;
and wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or these Any combination of:
- selecting network information (UE selected network information): for example, GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or any combination thereof;
security setting information (Security configuration information) : For example, SecurityAlgorithmConfig.
[0098]
　Terminal individual information (UE Context information) may also include at least one of the listed information elements below.
And wireless terminal capability information (UE capability information): for example, UE radio access capability, UE network capability, or UE security capability, or any combination of these;
and wireless terminal identifier information (UE identification information): for example, C-RNTI , (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting network information (UE selected network information): For example, GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or these Any combination of:
bearer information (Bearer information): for example, E-RAB ID, E-RAB Level QoS Parameters, or UL GTP Tunnel Endpoint ID, or any combination thereof;
and wireless resource control information (RRC context information ): AS-Config, AS-Context, ue-ConfigRelease, or ue-RadioAccessCapabilityInfo, or any combination of these;
and wireless terminal movement history information (UE history information): for example, Last Visited Cell Information;
-service information (Service information): for example, QCI, QoS, or MBMS information), or any combination thereof
[0099]
　Initial terminal information (Initial UE Message) may include at least one of the listed information elements below.
And wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting network information (UE selected network information): For example, GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or any combination of these;
and wireless terminal area information (UE are information): for example, Tracking Area ID (TAI), or EUTRAN Cell Global ID (ECGI), or a combination thereof;
and wireless connection purposes (factor) (Radio connection purpose information): for example, RRC Establishment cause;
-non-access layer data (NAS data information): for example, NAS PDU.
[0100]
　Non-access layer information (NAS information) may also include at least one of the listed information elements below.
And wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting network information (UE selected network information): For example, GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or any combination thereof;
and non-access layer data (NAS data information): for example, NAS PDU;
-non-access layer connection purposes (factor) (NAS connection purpose information): for example, NAS cause;
[0101]
　ここで、RRC Establishment cause又はNAS causeとして、例えばSecondary cell configuration（又はsetup）、Secondary bearer configuration（又はsetup）、target bearer configuration（又はsetup）、又はvirtual bearer configuration（又はsetup）、などを定義しても良い。
[0102]
　The application destination of these steps Examples 4 to procedure example 6, eNB1 operational large macrocells relatively coverage (management) to the macro radio base station: a (Macro eNB MeNB), eNB2 is operating a small cell coverage ( management) to low-power radio stations (Low Power Node: if a LPN) but is considered, it is not limited thereto. The LPN, for example pico radio base station having the same functions as those of the MeNB (Pico eNB: PeNB) and, it can be considered if a new type of network node function is small compared to the MeNB (New Node).
[0103]
　Then in the following will be described a specific example of a procedure example 4 to procedure example 6 described above. Figure 21 is a sequence diagram showing the whole procedure Example 4, Figure 22 is a sequence diagram showing an overall procedure example 5, FIG. 23 is a sequence diagram showing an overall procedure example 5.
[0104]
(Procedure Example 4)
　In Step S1401 of FIG. 21, UE3, eNB1, and EPC4 sets the control bearer for transmitting and receiving control information via the eNB1 in the cell 10 (Bearer Setup). Furthermore, UE3, eNB1, and EPC4 may set the first bearer for transmitting and receiving user data via the eNB1 in the cell 10. In step S1402, eNB1 sends a request for setting the second bearer for the U3 to eNB2 (Bearer Setup Request). In step 1403, eNB2 sends a request for setting the second bearer EPC4 (Initial UE Message). EPC4 (MME5), in response to a request from eNB2, controls the setting for the second bearer in S-GW6. Then, in step S1405, EPC4 (MME5) indicates the setting for the second bearer eNB2 (Initial Context Setup Request). The instruction includes a bearer configuration information for the second bearer. Instead of the Initial Context Setup Request message, and it may be used, for example E-RAB Setup Request message, or E-RAB Modify Request message, and the like.
[0105]
　eNB2 performs setting for the second bearer based on the bearer setting information. In step S1406, eNB2 transmits an acknowledgment of the bearer set EPC4 (Initial Context Setup Response). Instead of the Initial Context Setup Response message, and it may be used, for example E-RAB Setup Response message, or E-RAB Modify Response message, and the like. In step S1407, eNB2 notifies the setting completion of the second bearer eNB1 (Bearer Setup Complete). In step S1408, eNB1 sends a use start notification of the second cell 20 in the cell 10 to UE3 (Secondary Cell Configuration / Activation).
[0106]
(Procedure example 5)
　processing in step S1401 in FIG. 22 is the same as step S1401 in Fig. 21. In step S1502, eNB1 requests the setting of the second bearer for the UE3 to EPC4 (Bearer Setup Request). EPC4 (MME5), in response to a request from eNB2, controls the setting for the second bearer in S-GW6. Then, in step S1503, EPC4 (MME5) indicates the setting for the second bearer eNB1 (Initial Context Setup Request). Instead of the Initial Context Setup Request message, and it may be used, for example E-RAB Setup Request message, or E-RAB Modify Request message, and the like. The instruction includes a bearer configuration information for the second bearer. In step S15031, eNB1 transmits a response to the instruction from EPC4 (Initial Context Setup Response).
[0107]
　In step S1504, eNB1 instructs the setting of the second bearer eNB2 (Bearer Setup Instruction). eNB2 performs setting for the second bearer based on the instruction from the eNB1. In step S1505, eNB2 transmits a completion notification of the bearer set to eNB1 (Bearer Setup Complete). In step S1506, eNB1 sends a setting completion notification of the second bearer EPC4 (Bearer Setup Complete). Processing in step S1408 in FIG. 22 is the same as step S1408 in Fig. 21.
[0108]
(Procedure Example 6)
　processing at step S1401 and S1502 in Fig. 23 are the same as steps S1401 and S1502 of the procedure Example 2 shown in FIG. In step S1603, EPC4 (MME5) indicates the setting for the second bearer eNB2 (Initial Context Setup Request). Instead of the Initial Context Setup Request message, and it may be used, for example E-RAB Setup Request message, or E-RAB Modify Request message, and the like. The instruction includes a bearer configuration information for the second bearer. In step S1604, eNB2 performs settings relating to the second bearer based on the instruction from the EPC4, it transmits a completion notice of the bearer set EPC4 (Initial Context Setup Response). Instead of the Initial Context Setup Response message, and it may be used, for example E-RAB Setup Response message, or E-RAB Modify Response message, and the like. In step S1605, EPC4 sends a setting completion notification of the second bearer eNB1 (Bearer Setup Complete). Processing in steps S508 and S509 in FIG. 19 are similar to steps S508 and S509 in Step Example 1 and Step Example 2 shown in FIGS. 11 and 15.
[0109]

　In the present embodiment, will be described variation of the second embodiment described above. In the LTE system, transmission paths for the second cell 20 to transmit the downlink user data to UE3 (that is, the path of the second bearer) as, for example, are considered the following three routes.
· ALT1: transfers all of the downlink user data from the P / S-GW6 to eNB2 (eg LPN), these eNB2 sends to UE3.
· ALT2: transfers the part of the downlink user data from the P / S-GW6 to eNB1 (eg MeNB), to transfer the other from the P / S-GW6 to eNB2 (eg LPN). And, each of eNB1 and eNB2 to send a downlink user data to UE3.
· ALT3: I will transfer all of the downlink user data from the P / S-GW6 to eNB1 (eg MeNB). Next, it wants to transfer some or all of the downlink user data as needed eNB1 to eNB2 (eg LPN). And, each of eNB1 and eNB2 to send a downlink user data to UE3.
　Incidentally, ALT1 is, eNB1 becomes the role of a proxy (or a router), it can be considered when transferring downlink user data from the P / S-GW6 to eNB2 via eNB1.
[0110]
　On the other hand, control information for the UE3 (Control Plane Information) is transferred basically from MME5 to eNB1 (eg MeNB), eNB1 me is conceivable that sends it to the UE3. In the following, we will explain the route of this control information as a prerequisite. Figure 24 shows the path of ALT1 ~ ALT3, and control information of the above-described downlink user data path. However, the control information path of this embodiment is not limited thereto. For example, control information, as well as the user data, it may be transmitted to eNB2 via the eNB1 from MME5, it may be directly transmitted to the MME5 eNB2.
[0111]
　In the following, it will be described in detail example of the procedure of changing the downlink user data path due to the start of the Inter-eNB CA. First, the second bearer is set according to one of the procedures Examples 4-6 described in the second embodiment. Here the second bearer in is a E-RAB that goes through the S1 bearer, or eNB2 is set between EPC4 and eNB2. And, eNB1 requests the MME5 to change some of the downlink user data to the UE3 or all of the route in via eNB1. MME5, in response to a request from eNB1, (here, S-GW only, or both the S-GW and P-GW) a change request of the downlink user data path P / S-GW6 to send to. P / S-GW6 is, by updating the bearer set (Bearer Context) in response to a request MME5, changes the path of the downlink user data. The change request of the downlink user data path S-GW only, or whether to send to which of both the S-GW and P-GW, for example, necessity of a path change in the core network bearer (S5 / S8 bearer), or packet filters that are applied to the downlink user data in the P-GW: it is determined based on the necessity of changing the (Traffic Flow Template TFT).
[0112]
　When using different routes depending UE3 destined for the downlink user data (ie ALT2 or ALT3), it is necessary to divide the downlink user data to multiple data flows. This division, For example, the service type of the downlink user data, quality of service (QoS), Quality of Service class (Quality Class Indicator: QCI), real-time (Real time or Non-real time), on the basis of such a row Ebayoi. Switching between these units UE or service (QoS, QCI) downlink user data path in the unit, the delay may be carried out so as to satisfy the requirements such as a minimum throughput.
[0113]
　Figure 25 is a sequence diagram showing a procedure for changing the downlink user data path of the present embodiment. Note that FIG. 25 is a modification of the sequence diagram of a procedure example 4 described in the second embodiment (Fig. 21). Processing in steps S1401 ~ S1408 shown in Fig. 25 are the same as S1401 ~ S1408 of FIG. In step S1709, eNB1 transmits a switching request of the downlink user data path MME5 ((Partial) Path Switch Request). In step S1710, MME5 requests the change of bearer context or packet filter to P / S-GW6 ((Partial) U-Plane Update Request). In step S1711, P / S-GW6, based on the requirements of MME5, the update bearer context or packet filter, changing the path of some or all of the downlink user data destined for UE3. In step S1712, P / S-GW6 notifies the completion of the route change to MME5 (U-Plane Update Response). Finally, in step S1713, MME5 notifies the completion of the route change to eNB1 ((Partial) Path Switch Request ACK). Here, "Partial" is meant that the part of the user data to eNB1, when forwarding the remaining user data to eNB2, and sets the transfer destination types of user data (for example, service or QoS) each are doing. In other words, Partial Path Switch Request, Partial U-Plane Update Request, and Partial Path Switch Request ACK, etc., are applied when implementing the ALT2 described above.
[0114]
　Note that FIG. 25, there is shown a modification of the procedure Example 4, the procedure of changing the downlink user data path of the present embodiment can of course be applied to a procedure example 5 or procedure example 6.
[0115]

　In the second and third embodiments described above, UE3 is an uplink physical control channel in the secondary cell (cell 20) (physical uplink control channel: PUCCH) or Layer 1 or Layer 2 using Both these control information for the (L1 / L2 control information) may be transmitted. Specifically, UE3 is in response to the downlink reception of the secondary cell (cell 20) (eg, H-ARQ (Hybrid Automatic Repeat Request) ACK, CQI (Channel Quality Indicator) / PMI (Precoding Matrix Indicator), or RI the reply (Rank Indicator)), may be used PUCCH secondary cell (cell 20).
[0116]
　In normal CA that same eNB is to operate a plurality of cells, L1 / L2 control information using the PUCCH are all sent in the primary cell. However, employing the same architecture and normal CA in Inter-eNB CA, requires interworking between eNB1 and eNB2, it can lead to processing delays and additional network load. On the contrary, it is possible to use a physical uplink control channel of the secondary cell (cell 20) for response, etc. for the downlink reception of the secondary cell (cell 20), becomes unnecessary interworking between eNB1 and eNB2 .
[0117]

　In the first to third embodiments, the secondary cell to be added for carrier aggregation (cell 20), a downlink component carrier (Component Carrier: CC) alone, or, uplink component carrier (CC ) only it may be used for.
[0118]

　In the first to third embodiments, the primary cell (cell 10) and a secondary cell (cell 20) may be a different duplex modes (duplex mode). For example, a primary cell (cell 10) is in the FDD (Frequency Division Duplex), a secondary cell (cell 20) may be a TDD (Time Division Duplex).
[0119]

　In the first to third embodiments, the first radio station 1 (for example, eNB1) is a wireless terminal 3 (for example, UE3) the second radio station in the second cell 20 2 (eg, eNB2) showed a behavior that triggers the setting of the second bearer for performing transmission or reception of user data via the. Furthermore, in the case of releasing the second bearer (Release), the first radio station 1 may trigger the bearer release. For example, in Step Example 1 and 4 above, the radio station 1 (for example, eNB1) in response to the request (ie, triggering), the radio station 2 (eg, eNB2) is higher network 4 (for example, EPC4 (ie, MME5 )) the setting request of the second bearer we went to. Likewise, when releasing the second bearer, the radio station 2 releases the second bearer in response to the release request of the second bearer from the radio station 1, the second bearer to the upper network 4 release notification to (E-RAB Release Indication) may be transmitted.
[0120]
　In step Example 2 or 5 described above, the radio station 1 (for example, eNB1) the upper network 4 (for example, EPC4 (in other words, MME5)) settings request of the second bearer in the upper network 4 of the second bearer Set the wireless station 2 via the radio station 1 (for example, eNB2) to notify the setting information of the second bearer. Similarly, if you want to release the second bearer, radio station 1, release request of the second bearer in the upper network 4 (E-RAB Release Request) may be performed. Then, the higher the network 4 in response to a release request of the second bearer releases the second bearer may perform a release instruction of the second bearer to the radio station 1 (E-RAB Release Command) . The wireless station 1 then transfers the release instruction to the radio station 2, in response to the release of the second bearer in the radio station 2, the completion of the release of the second bearers to (E-RAB Release Complete) Top You may notify the network 4.
[0121]
　In step Example 3 or 6 above, the radio station 1 (for example, eNB1) the upper network 4 (for example, EPC4 (in other words, MME5)) settings request of the second bearer in the upper network 4 of the second bearer Set the wireless station 2 (eg, eNB2) to notify the setting information of the second bearer. Similarly, if you want to release the second bearer, radio station 1, release request of the second bearer in the upper network 4 (E-RAB Release Request) may be performed. Then, the higher the network 4 in response to a release request of the second bearer releases the second bearer, be notified of the second bearer release instruction (E-RAB Release Command) to the radio station 2 good. The radio station 2 releases the second bearer in response to the release instruction may be a second bearer release completion to (E-RAB Release Complete) notifies the upper network 4. Thus, the wireless terminal 3 (for example, UE3) in the case where it has carrier aggregation of cells of different radio stations, the release of the second bearer that has been used for transmission or reception of user data in the secondary cell, the radio terminal The three load can be achieved without increasing.
[0122]

　In addition, FIG exemplified in the first to third embodiments showed a heterogeneous network (HetNet) environment. However, these embodiments can also be applied to a homogeneous network (Homogeneous Network). Examples of Homogeneous Network, a cellular network of the macro (or micro) cells of the macro (or micro) base stations can be considered.
[0123]

　wireless station 1 (the communication controller 15) described in the first to third embodiments, the radio station 2 (communication control unit 25), the wireless terminal 3 (a communication control unit 35), mobility management unit 5 (the bearer setting control unit 52), and a bearer control method according to the data repeater 6 (bearer control unit 65) may be realized either by using a semiconductor processing apparatus including an Application Specific Integrated Circuit (ASIC). Moreover, these processes, at least one processor may be realized by executing the program on a computer system including a (eg microprocessor, Micro Processing Unit (MPU), Digital Signal Processor (DSP)). Specifically, to create one or more programs including instructions for performing the algorithm shown in the flowchart and the sequence diagram in a computer system, it may be supplied to the program in the computer.
[0124]
　The program is stored using different types of non-transitory computer readable medium (non-transitory computer readable medium), it can be supplied to the computer. Non-transitory computer readable medium includes a recording medium with different types of entities (tangible storage medium). Examples of non-transitory computer readable media include a magnetic recording medium (a flexible disk, magnetic tape, hard disk drives), optical recording media (for example, a magneto-optical disk), CD-ROM (Read Only Memory), CD-R, CD-R / W, and includes a semiconductor memory (for example, a mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). Also, the program may be supplied to the computer by a transitory computer readable media of various types (transitory computer readable medium). Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer readable media include wired communication path such as electrical wires or optical fibers, or via a wireless communication path, to supply the program to the computer.
[0125]

　In the first to third embodiments, it was primarily been described with respect to an LTE system. However, these embodiments, wireless communication systems other than the LTE system, for example, 3GPP UMTS (Universal Mobile Telecommunications System), 3GPP2 CDMA2000 system (1xRTT, HRPD (High Rate Packet Data)), GSM (Global System for Mobile Communications) system, or it may be applied to WiMAX systems.
[0126]
　Furthermore, the above-described embodiments are merely examples of the application of the technical idea obtained by the present inventors. That is, the technical concept is not intended to be limited only to the embodiment described above, it is needless to say various modifications are possible.
[0127]
　This application claims priority based on Japanese Patent Application No. 2012-223178, filed on October 5, 2012, the entire disclosure of which is incorporated herein.
Description of sign
[0128]
1 radio station
2 radio stations
3 wireless terminal
4-level network
5 mobility management device
6 data relay device
15 communication control unit
25 the communication control unit
35 the communication control unit
52 bearer setting control unit
65 bearer control unit

Claims
[Claim 1]
　A first radio station to operate the first cell,
　the second radio station to operate the second cell,
　the second while the first wireless connection has been established in the first cell and the wireless terminal having a function of establishing a second wireless connection in a cell,
　a host network capable of transmitting or receiving a signal to and from said first and second of said radio terminal via a radio station,
preparedness,
　the upper network, at least the as well as sets the control bearer for transmitting a control signal for the wireless terminal, the second radio station and the upper network between the first radio station and the upper network and it is configured to set the second bearer for transferring the user data relating to the wireless terminal among,
　the first radio station is adapted to trigger the setting of the second bearer,
the radio communication system.
[Claim 2]
　The upper network further sets the first bearer for transferring the user data between the first radio station and the upper network, a wireless communication system according to claim 1.
[Claim 3]
　The first radio station, by sending a setting request of the second bearer to the upper network, to trigger the upper network so as to set said second bearer according to claim 1 or 2, wireless communication system.
[Claim 4]
　The first radio station, by sending a request to the second radio station, and triggers the second radio station to set the second bearer,
　the second radio station, the In response to the request from the first radio station transmits a setting request of the second bearer to the upper network,
to a wireless communication system according to claim 1 or 2.
[Claim 5]
　The upper network, the response to the setting request, the second starting set the bearer, the radio communication system according to claim 3 or 4.
[6.]
　The upper network, the setting information of the second bearer to notify the first or second radio station, a radio communication system according to any one of claims 1-5.
[7.]
　The first radio station, said in response to the setting of the second bearer is completed, and instructs the use start of the second cell to the radio terminal, in any one of claims 1 to 6, wireless communication system described.
[8.]
　The second radio station to establish a second wireless connection with the wireless terminal, and transmitting or receiving the user data to and from the wireless terminal, according to any one of claims 1 to 7 of wireless communication system.
[9.]
　The first bearer, includes bearer between the first radio station and the upper network, and at least one bearer between the upper network through the first radio station and the radio terminal ,
　wherein the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal including, a wireless communication system according to claim 2.
[10.]
　The second radio station notifies the first radio station at least one of said terminal individual information of the wireless terminal associated with the setting of the second bearer, the initial terminal information, and the non-access stratum information , the radio communication system according to any one of claims 1-9.
[11.]
　The first radio station informs the at least one second radio station among the terminal individual information of the wireless terminal associated with the setting of the second bearer, the initial terminal information, and the non-access stratum information , the radio communication system according to any one of claims 1 to 10.
[12.]
　The setting information of the second bearer, (a) bearer information, (b) the wireless terminal capability information, at least one of (c) a wireless terminal identifier information, (d) selecting the network information, and (e) security information The comprises, the radio communication system according to claim 6.
[13.]
　The terminal individual information, (a) the wireless terminal capability information, (b) a wireless terminal identifier information, (c) selecting the network information, (d) bearer information, (e) the radio resource control information, (f) of the wireless terminal move history information, and (g) the service at least one of the information, the wireless communication system according to claim 10 or 11.
[14.]
　The initial terminal information, (a) wireless terminal identifier information, (b) select network information, (c) wireless terminal area information, (d) wireless connection purpose or cause, and (e) at least one of the non-access layer data The includes a wireless communication system according to claim 10 or 11 One.
[15.]
　The non-access stratum information, (a) a wireless terminal identifier information, (b) selecting the network information, and (c) at least one of the non-access stratum data, the wireless communication system according to claim 10 or 11.
[16.]
　The upper network sets a plurality of network identifiers to said wireless terminal, a wireless communication system according to any one of claims 1 to 15.
[17.]
　Wherein the plurality of network identifiers, a first identifier to identify the wireless terminal in the control connection between the first radio station and the upper network, and between the second radio station and the upper network including a second identifier for identifying the wireless terminal in the control connection, and wireless communication system according to claim 16.
[18.]
　The first radio station, (a) wherein the wireless terminal detects the second cell, (b) that the predetermined condition relating to the traffic load of the first cell is satisfied, and (c) the wireless terminal in accordance with at least one that has requested a certain type of service, and to trigger the setting of the second bearer, the radio communication system according to any one of claims 1 to 17.
[19.]
　The first cell is a primary cell,
　said second cell is a secondary cell,
　the wireless terminal, the Layer 1 control information and Layer 2 control information using a physical uplink control channel in said second cell sending at least one,
and wireless communication system according to any one of claims 1 to 17.
[20.]
　A first radio station to operate the first cell,
　the wireless communication means for operating said first cell,
　a second while the first wireless connection has been established in the first cell a communication controller for controlling communication with the radio terminal having a function of establishing a second wireless connection in the second cell to be operated by the radio station,
　said communication control means,
　wherein the upper network first radio as well as sets the control bearer for transmitting a control signal related to at least said wireless terminal between the stations,
　a second for transferring the user data relating to the wireless terminal between the second radio station and the upper network It triggers the bearer setting,
the first radio station.
[21.]
　The first setting the bearer, the first radio station according to claim 20 for transferring the user data between the communication control means further includes a first radio station and the upper network.
[22.]
　It said communication control unit, by sending a request to the upper network, to trigger the upper network so as to set the second bearer, the first radio station according to claim 20 or 21.
[23.]
　Said communication control unit, by sending a request to the second radio station, and triggering the second radio station to set the second bearer, the first according to Claim 20 or 21 radio station.
[24.]
　It said communication control means receives the setting information of the second bearer from the upper network, the first radio station according to any one of claims 21 to 23.
[25.]
　Said communication control means, wherein in response to the setting of the second bearer is completed, an instruction to use the start of the second cell to the radio terminal, as claimed in any one of claims 21 to 24 the first radio station.
[26.]
　The first bearer, includes bearer between the first radio station and the upper network, and at least one bearer between the upper network through the first radio station and the radio terminal ,
　wherein the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal It includes a first radio station according to claim 21.
[27.]
　Said communication control means receives the terminal individual information of the wireless terminal associated with the setting of the second bearer, the initial terminal information, and at least one of the non-access layer information from the second radio station, wherein The first radio station according to any one of claim 21 to 26.
[28.]
　It said communication control means transmits the terminal individual information of the wireless terminal associated with the setting of the second bearer, the initial terminal information, and at least one of the second radio station the non-access layer information, billing The first radio station according to any one of claim 21-27.
[29.]
　The first radio station, (a) wherein the wireless terminal detects the second cell, (b) that the predetermined condition relating to the traffic load of the first cell is satisfied, and (c) the wireless terminal in accordance with at least one that has requested a certain type of service, and to trigger the setting of the second bearer, the first radio station according to any one of claims 21 to 28.
[Claim 30]
　And a second radio station to operate the second cell,
　the wireless communication means for operating the second cell,
　the first radio connection in a first cell to be operated by the first radio station is established a communication controller for controlling communication with the radio terminal having a function of establishing a second wireless connection in the second cell while being,
　said communication control means, from the first radio station request or instruction or in response to a request or instruction from the first triggered upper network to the wireless station, for transferring user data relating to the wireless terminal between the second radio station and the upper network Setting the second bearer,
the second radio station.
[31.]
　It said communication control means sets the second bearer in response to a request or instruction from the first radio station, the second radio station according to claim 30.
[32.]
　It said communication control means receives the setting information of the second bearer from the first radio station or the upper network, the second radio station according to claim 31.
[33.]
　Wherein the second bearer may include the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal The second radio station according to any one of claims 30-32.
[34.]
　A wireless terminal used combined with a wireless communication system according to any one of claims 1 to 19,
　a wireless communication means,
　wherein said indication of usage start of the second cell the first wireless It is received from the station, and establishing a second wireless connection between the first wireless connection has been established, and controls the wireless communication unit to receive or transmit user data at least a second cellular communication and control means,
equipped with a wireless terminal.
[35.]
　Said communication control means receives the terminal individual information relating to the configuration of the second bearer, the initial terminal information, and at least one of the non-access layer information from the first radio station, according to claim 34 of the wireless terminal.
[36.]
　A network device disposed on the upper network,
　the second the first wireless connection in a first cell that is operated by the first radio station is operated by the second radio station while being established and a control means for controlling the setting of the bearer for the mobile station having a function of establishing a second wireless connection in a cell,
　the control means,
　at least via the first radio station in the first cell and controls the upper network to set a control bearer for transmitting or receiving a control signal related to the wireless terminal,
　the bearer from the first or second radio station, which is triggered by the first radio station In response to the setting request, it controls the upper network so as to set the second bearer for transmitting or receiving user data through the second radio station in the second cell,
the network devices.
[37.]
　Said control means further controlling said upper network to set the first bearer for transmitting or receiving the user data via the first radio station in the first cell, to claim 36 network device described.
[38.]
　Wherein the control unit notifies the setting information of the second bearer with the first or second radio station, the network apparatus according to claim 36 or 37.
[39.]
　The first bearer, includes bearer between the first radio station and the upper network, and at least one bearer between the upper network through the first radio station and the radio terminal ,
　wherein the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal including, to the network device according to claim 37.
[40.]
　Wherein the control means sets a plurality of network identifiers to said wireless terminal, a network device according to any one of claims 36-39.
[41.]
　Wherein the plurality of network identifiers, a first identifier to identify the wireless terminal in the control connection between the first radio station and the upper network, and between the second radio station and the upper network including a second identifier for identifying the wireless terminal in the control connection, and a network device according to claim 40.
[42.]
　A bearer control method in the first radio station to operate the first cell,
　the second to the first radio connection in the first cell is operated by the second radio station while being established For a wireless terminal having a function of establishing a second wireless connection in a cell, setting the control bearer for transmitting a control signal related to at least said wireless terminal between said the upper network the first radio station, and
　, to trigger the setting of the second bearer for transferring the user data relating to the wireless terminal between the second radio station and the upper network
including a bearer control method.
[43.]
　Setting the first bearer for transferring the user data relating to the wireless terminal between the first radio station and the upper network, further comprising, and bearer control method according to claim 42.
[44.]
　It is, by sending a request to the upper network, and involves triggering the upper network so as to set the second bearer, the bearer control method according to claim 42 or 43 to the trigger.
[45.]
　To the trigger, by sending a request to the second radio station, and involves triggering the second radio station to set said second bearer according to claim 42 or 43 bearer control method.
[46.]
　Further comprising receiving a setting information of the second bearer from the upper network, the bearer control method according to any one of claims 42-45.
[47.]
　Depending on the setting of the second bearer is completed, the use start of the second cell further comprising instructing the radio terminal to the bearer control according to any one of claims 42-46 Method.
[48.]
　The first bearer, includes bearer between the first radio station and the upper network, and at least one bearer between the upper network through the first radio station and the radio terminal ,
　wherein the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal including, the bearer control method according to claim 43.
[49.]
　A bearer control method in the second radio station to operate the second cell,
　and in response to a request or instruction from the request or instruction or the first upper network that is triggered in the radio station of the first radio station And then, the radio terminal having a function of establishing a second wireless connection in the second cell while the first radio connection in a first cell to be operated by the first radio station has been established For comprises setting the second bearer for transferring the user data relating to the wireless terminal between the second radio station and the upper network, the bearer control method.
[Claim 50]
　A communication control method in a wireless terminal used in conjunction with a wireless communication system according to any one of claims 1 to 19,
　wherein the first radio station an instruction to start the use of the second cell It is received from, and to establish a second wireless connection between the first wireless connection has been established, comprising to be controlled to receive or transmit user data in at least the second cell,
the communication control method .
[51.]
　A bearer control method in a network device disposed in the upper network,
　and is operated by the second radio station while the first radio connection in a first cell to be operated by the first radio station has been established For a wireless terminal having a function of establishing that the second radio connection in the second cell, and transmits or receives a control signal related to at least the wireless terminal via the first wireless station in the first cell By controlling the upper network to set a control bearer for, and
　in response to the bearer setup request from the first or second radio station, which is triggered by the first radio station, the second The second through the radio station, to control the upper network so as to set the second bearer for transmitting or receiving user data related to the wireless terminal in a cell
comprising a bearer control method.
[Claim 52]
　Further comprising controlling said upper network to set the first bearer for transmitting or receiving the user data via the first radio station in the first cell of claim 51 bearer control method.
[53.]
　The first bearer, includes bearer between the first radio station and the upper network, and at least one bearer between the upper network through the first radio station and the radio terminal ,
　wherein the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the upper network through the second radio station and the radio terminal including, the bearer control method according to claim 52.
[54.]
　A non-transitory computer readable medium storing a program for causing a bearer control method in the first radio station to operate the first cell in a computer,
　the method,
　first in the first cell 1 a second for a wireless terminal having a function of establishing a second wireless connection in a second cell that is operated by a radio station, the higher the network to the first radio station while the radio connection has been established for Setting the controlled bearer for transmitting a control signal related to at least said wireless terminal, and between the
　second bearer for transferring the user data to wireless terminals between the second radio station and the upper network to trigger a set of things,
including a computer-readable media.
[55.]
　A non-transitory computer readable medium storing a program for causing a bearer control method in a computer in the second radio station to operate the second cell,
　the method requests from the first radio station or in response to requests or instructions from the instruction or the first upper network that is triggered in the radio station, the first wireless connection has been established in the first cell to be operated by the first radio station For a wireless terminal having a function of establishing a second wireless connection in the second cell during, dies for transferring user data relating to the wireless terminal between the second radio station and the upper network including setting the two bearers,
computer-readable media.
[56.]
　A non-transitory computer readable medium storing a program for causing a communication control method in a wireless terminal used in conjunction with a wireless communication system according to any one of claims 1 to 19 in a computer ,
　The method includes receiving an instruction to use the start of the second cell from the first radio station, the second radio connection established between the first wireless connection has been established, at least the It includes controlling to receive or transmit user data in a second cell,
the computer-readable medium.
[57.]
　A non-transitory computer readable medium storing a program for causing a bearer control method for a computer in a network device disposed in the upper network,
　the method,
　the first operated by the first radio station For a wireless terminal having a function of establishing a second wireless connection in a second cell which is operated by the second radio station while the first radio connection in the cell has been established, the first is allowed By controlling the upper network to set a control bearer for transmitting or receiving a control signal related to at least the wireless terminal via the first radio station in, and
　the triggered by the first radio station In response to the bearer setup request from the first or second radio station, a second for transmitting or receiving user data related to the wireless terminal via the second radio station in the second cell By controlling the upper network to set the bearer,
including a computer readable medium.