Technical field
[0001]The present invention relates to a radio communication system in which radio station and the radio terminal performs communication using a plurality of cells.
BACKGROUND
[0002]Improvement of decrease in communication quality due to rapid increase in recent mobile traffic, and for the realization of higher speed communication, 3GPP LTE (Long Term Evolution) radio base station (eNode B: eNB) and a radio terminal (User Equipment: UE ) carrier aggregation (carrier aggregation for conducting communications using a plurality of cells: CA) functional specification of have been made. Incidentally, UE is available cell CA is limited to one eNB cell (i.e., cell eNB is operated).
[0003]
　The procedure of CA will be described with reference to FIG. 26 (Non-Patent Document 1). Figure 17 shows an example where the UE CA the first cell (Cell1) and a second cell that is operated (Cell2) by eNB. In step S1, UE and the eNB establishes a wireless connection in a first cell (RRC Connection Establishment). In step S2, UE receives downlink data from the eNB in ​​the first cell (Downlink data on Cell1). Here, the first cell is a primary cell to the UE (Primary cell: PCell) become.
[0004]
　In step S3, eNB is, UE secondary cell (Secondary cell: SCell) determines that it is necessary to set, and the second cell is set as SCell in PCell (RRC Connection Reconfiguration on Cell1 (including Configuration of Cell2 ( Secondary cell:. SCell)) in step S4, UE is the setting of the second cell is completed, that is it 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 transmits a use start notification of the second cell to the UE (Cell2 Activation). In step S6, UE uses the first and second cell simultaneously receives the downlink data (DL data on Cell1 and Cell2). Incidentally, UE in step S6 may be any time available for downstream data receiving first and second cell. In other words, UE does not always need to receive downlink data in both the first and second cells. Or using the first and one or both to use the one of the second cell for downlink data reception, for example, amount of downlink data or UE is determined based on the service to be used. Even if the UE in the second cell transmits the uplink data is basically feasible with a procedure similar to that shown in FIG. 26.
[0006]
　UE performing the CA, Physical layer a MAC (Medium Access Control) but with each cell is integrated at least part of the layer functions, RLC (Radio Link Control) layer above structure are the same as the case without CA it is. Therefore, the core network (Evolved Packet Core: EPC) is not aware whether the UE is CA.
[0007]
　Furthermore, heterogeneous network (Heterogeneous Network: HetNet) in the environment, the concept of Inter-eNB CA to integrate multiple cells that operate by different eNB has been proposed (Non-Patent Document 2). For example, the Inter-eNB CA, macro base station (Macro eNB: MeNB) macrocell operated by (Macro cell) and pico base station (Pico eNB: PeNB) be used picocell (Pico cell) operated by It is considered.
[0008]
　Furthermore, using a wide macrocell coverage for transmission and reception of the control system signals such as UE mobility management, a method of using a relatively communication quality good picocell to send and receive data system signals such as user data has been proposed (non-Patent Document 3).
CITATION
Non-patent literature
[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 to communicate using a plurality of cells which are operated by a single radio station (eNB), UE has been able to set a plurality of cells. On the other hand, in the carrier aggregation of multiple cells that operate by different eNB (Inter-eNB CA), in order to be able to use simultaneously in the UE a plurality of cells that are operated by different eNB for reception or transmission of user data, data bearer for the user data transfer needs to be set in each cell. However, in the current LTE specification, if the UE has configured the data bearer in a cell of one eNB, it is impossible to set the data bearer simultaneously 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 the 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 mobility. Data bearers in LTE is EPS (Evolved Packet System) bearer. Data bearers in LTE is EPS (Evolved Packet System) bearer.
[0012]
　The core network bearer external gateway arranged in the upper network (Packet Data Network Gateway: P-GW) and data relay node (Serving Gateway: S-GW) tunnels set between, that is logical transmission path, it is. External Gateway (P-GW) is the gateway node that is located on the boundary between the external network. Data relay node (S-GW) is a node that is located at the boundary between the RAN. Core network bearer in LTE is S5 / S8 bearer (i.e., GTP (GPRS Tunneling Protocol) tunnels).
[0013]
　Radio access bearer is a bearer is set between the data relay node of the upper network and (S-GW) UE. Radio access bearer includes bearer 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 of RLC (Radio Link Control) and RRC (Radio Resource Control) RAN node responsible for (i.e., the LTE eNB) and the upper network forwarding node. Radio bearer is set between the above RAN node (eNB) UE in a RAN. Radio access bearers in LTE is E-RAB (E-UTRAN Radio Access Bearer). If LTE, employed bearer is set between the RAN and the upper network is S1 bearer (i.e., GTP tunnel). The radio bearer in LTE is EPS RB (Evolved Packet System Radio bearer).
[0014]
　One of the objects of the present invention, in order to realize the carrier aggregation of multiple cells that operate by different radio stations, at the same time bearers in a plurality of cells of a radio station for one wireless terminal (e.g., S1 bearer, E -rab, or EPS bearer) can be set a radio communication system, a radio station is to provide wireless terminals, 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. The 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 through the first and second radio stations. Further, the upper network sets a control bearer for transmitting a control signal related to at least the wireless terminal between the first radio station and the higher-level network, said upper network of the second radio station It is configured to set a second bearer for transferring user data relating to the wireless terminal between. Further, 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 to operate the first cell, and a communication control unit. Said communication control unit, a radio having 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 the communication with the terminal. Further, the communication control unit sets a control bearer for transmitting a control signal related to at least the wireless terminals between said upper network first radio station, and the upper network of the second radio station It is configured to trigger the setting of the second bearer for transferring user data relating to the wireless terminal between.
[0017]
　In a third aspect, the second radio station includes a radio communication unit for operating the second cell, and a communication control unit. Said communication control unit, a radio having a function of establishing a second wireless connection in the second cell while the first radio connection in a first cell that is operated by the first radio station has been established It controls the communication with the terminal. Further, the communication control unit, a request or an instruction from the first radio station, or the response to a request or an instruction from the first triggered upper network to the radio station, the upper network and the second is configured to between the radio station sets the second bearer for transferring user data relating to the wireless terminal.
[0018]
　In a fourth aspect, the radio terminal includes a radio communication unit and a communication control unit. During the communication control unit, which receives an 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 wireless connection has been established the second establishes a wireless connection, 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 to be operated by the second radio station while the first wireless connection has been established in the first cell operated by a first radio station controlling the setting of the bearer for a wireless terminal having a function of establishing. Wherein the control unit is configured to control the upper network so as to set control bearer for transmitting or receiving a control signal related to at least the wireless terminal via the first radio station in the first cell there. Further, the control unit, in response to a request for setting bearer from said first of said first or second radio station is triggered by a radio station, the second radio station in the second cell through it and configured to control the upper network to set a second bearer for transmitting or receiving user data.
[0020]
　In a sixth aspect, bearer control method in the first radio station to operate the first cell,
(a) the second radio station while the first wireless connection in the first cell has been established 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 the wireless terminals between said upper network first radio station setting a control bearer, and
(b) to trigger the second bearer settings for transferring the user data relating to the wireless terminal between the upper network and the second radio station,
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 station request or in response to an instruction, the ability to establish a second wireless connection in the second cell while the first of the first radio connection in a first cell operated by the radio station has been established for a wireless terminal having an includes setting a second bearer for transferring user data relating to the wireless terminal between the second radio station and the higher-level network.
[0022]
　In an eighth aspect, a communication control method in a wireless terminal receives an 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 a second radio connection established between the wireless connection is established includes receiving or transmitting user data in at least the second cell.
[0023]
　In a ninth aspect, bearer control method in a network device disposed in the upper network,
the while being established first radio connection in a first cell that is operated by (a) a first radio station for a wireless terminal having a function of establishing a second wireless connection in a second cell that is operated by the second radio station, for at least said wireless terminal via the first radio station in the first cell controlling the upper network so as to set control bearer for transmitting or receiving control signals, and
(b) the bearer from said first of said first or second radio station is triggered by a radio station in response to the setting request, set a second bearer for transmitting or receiving user data related to the wireless terminal via the second radio station in the second cell Controlling the upper network to the constant,
including.
[0024]
　In a tenth aspect, the program includes instructions for causing a bearer control method in the first radio station according to a sixth aspect of the above in a computer.
[0025]
　In an eleventh aspect, the program includes instructions for causing a communication control method in the second radio station according to a seventh aspect of the above in a computer.
[0026]
　In an eleventh aspect, the program includes instructions for causing a bearer control method in a wireless terminal according to an eighth aspect of the above in a computer.
[0027]
　In a twelfth aspect, the program includes instructions for causing a bearer control method in a network device according to a ninth aspect of the above in a computer.
The invention's effect
[0028]
　According to the above embodiments, different in order to realize the carrier aggregation of multiple cells operated by radio station, at the same time bearers in the cell of the plurality of radio stations for one wireless terminal (e.g., S1 bearer, E-RAB, or EPS bearer) can be set a radio communication system, a radio station, it is possible to provide a wireless terminal, communication control method, and a program.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment.
2 is a diagram showing a first configuration example of a radio station according to the first embodiment.
3 is a diagram showing a configuration example of a second radio station according to the first embodiment.
4 is a diagram showing a configuration example of a radio terminal according to the first embodiment.
5 is a diagram showing a configuration example of a mobility management device according to the first embodiment.
6 is a diagram showing a configuration example of a data relay apparatus according to the first embodiment.
7 is a flowchart showing a first operation example of the radio station according to the first embodiment (procedure example 1).
8 is a flowchart showing an operation example of the second radio station according to the first embodiment (procedure example 1).
9 is a flowchart showing an operation example of the upper network according to the first embodiment (procedure example 1).
FIG. 10 is a flowchart showing an operation example of the wireless terminal according to the first embodiment (procedure example 1).
11 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the first embodiment (procedure example 1).
12 is a flowchart showing a first operation example of the wireless station according to the first embodiment (Procedure Example 2).
13 is a flowchart showing an operation example of the upper network according to the first embodiment (Procedure Example 2).
14 is a flowchart showing an operation example of the second radio station according to the first embodiment (Procedure Example 2).
15 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the first embodiment (Procedure Example 2).
16 is a flowchart showing a first operation example of the radio station according to the first embodiment (procedure example 3).
17 is a flowchart showing an operation example of the upper network according to the first embodiment (procedure example 3).
18 is a flowchart showing an operation example of the second radio station according to the first embodiment (procedure example 3).
19 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the first embodiment (procedure example 3).
FIG. 20 is a diagram showing an example of configuration of a wireless communication system according to the second embodiment.
21 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the second embodiment (procedure example 4).
22 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the second embodiment (Procedure Example 5).
FIG. 23 is a sequence diagram showing an example of a bearer control method in a wireless communication system according to the second embodiment (Procedure Example 6).
FIG. 24 is a diagram showing a configuration example of a wireless communication system according to the third embodiment.
[25] is a sequence diagram showing an example of a method for changing the user data path in the wireless communication system according to the second embodiment.
[FIG. 26] is a sequence diagram showing an LTE carrier aggregation procedure (background art).
DESCRIPTION OF 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 clarity of description, repeated explanation is omitted as appropriate.
[0031]

　FIG 1 shows a configuration example 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 the upper network 4. Radio station 1 and 2, to operate the first cell 10 and second cell 20, respectively. Radio station 1 and 2, for example, a radio base station, or a base station control station. The wireless terminal 3, while maintaining the first wireless connection in the first cell 10, and is configured to be able to establish a second wireless connection in the second cell 20. Thus, the wireless terminal 3, the signal (e.g., user data, or control information) can be used multiple cells for transmission or reception of the (e.g., cell 10 and 20) at the same time. In other words, the wireless terminal 3 supports carrier aggregation of a plurality of cells which are operated by different wireless stations.
[0032]
　Note that "at the same time using a plurality of cells", which can actually limited to simultaneously receive or transmit signals in a plurality of cells in the to Sarezu, receiving or transmitting signals in both of the plurality of cells it has become a state of actually receiving or transmitting signals in one cell, to receive or transmit different types of signals in each of a plurality of cells, or the reception or signals a plurality of cells It is used for either transmission, and the like.
[0033]
　In the present specification, "establishment of the wireless connection", for example, that the radio terminal and the radio station becomes ready for communication, or the state in which the radio terminal and the radio station is to share information necessary for communication It made it corresponds to.
[0034]
　Further, FIG. 1 shows a HetNet environment. More specifically, the first cell 10 shown in FIG. 1 has a wider coverage than the second cell 20. Further, FIG. 1, the second cell 20 indicates the placed hierarchical cell structure in the first cell 10. However, the cell arrangement shown in FIG. 1 is only an example. For example, the first and second cells 10 and 20 may have a coverage comparable. In other words, a wireless communication system according to this embodiment may be applied to a homogeneous network (Homogeneous Network) environment.
[0035]
　Upper network 4 is a network managed by the operator to provide a predominantly mobile communication services. Upper network 4, the mobility management of the radio terminal 3 (e.g., location registration, location update), and bearer management (e.g., bearer establishment, bearer reconfiguration, bearer release) control system for performing such (control plane: C-plane) function and, data transfer system for transferring user data of the wireless terminal 3 with an external network (not shown) and 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 responsible for C-plane function, at least one data relaying apparatus responsible for U-plane functions. At least one data relay apparatus, and a node disposed at the boundary between the RAN including the wireless station 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 (e.g., user data, or control information) to be made available simultaneously in the wireless terminal 3 for receiving or sending, the present embodiment wireless communication systems, at the same time the bearer in one of a plurality of multiple cells 10 and 20 of the radio station 1 and 2 for the wireless terminal 3 (for example, control bearer, S1 bearer, E-RAB, or EPS bearer) necessary to set the there is. Therefore, the wireless communication system of this embodiment operates as follows. That is, the higher the network 4, and sets at least one control bearer for transmitting or receiving a first bearer, and the control signal for transmitting or receiving user data via the radio station 1 in the cell 10, It is configured to set a second bearer for transmitting or receiving user data via the radio station 2 in the cell 20. Here, the first bearer includes a bearer (e.g., S1 bearer or E-RAB) for transferring user data between the upper network 4 and the wireless station 1. The control bearer includes a bearer for transmitting or receiving control signals between the upper network 4 and the wireless station 1. The second bearer includes a bearer (e.g., S1 bearer or E-RAB) for transferring user data between the upper network 4 and the radio station 2.
[0037]
　Furthermore, the radio station 1 is configured to trigger the setting of the second bearer. That is, in the present embodiment, the radio station 1 which is different from any of the wireless terminal 3 and the wireless station 2 to use the second bearer triggers the setting of the second bearer. Upper network 4 may control the second bearer setup 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, the bearer for the simultaneous wireless terminal 3 in a plurality cells 10 and 20 (e.g., control bearer it can be set S1 bearer, E-RAB, or EPS bearer).
[0038]
　In the present 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 which the wireless terminal 3 transmits or receives via the wireless station 2 in cell 20, may be transferred between the radio station 2 and the upper network 4 via the wireless station 1.
[0039]
　Wireless station 1, when communicating with the wireless terminal 3 by using the first bearer in the first cell 10 may be triggering the setting of the second bearer. Radio station 1 is (a) that the wireless terminal 3 detects the second cell 20, (b) when a predetermined condition is satisfied regarding the traffic load of the first cell 10, and (c) the wireless terminal 3 We have requested the given type of service, according to at least one, may trigger the setting of the second bearer.
[0040]
　Then hereinafter be described 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 radio station 1 is to trigger the second bearer configuration may be transmitted a bearer setup request to the radio station 2. In another example, the radio station 1 may trigger the upper network 4 so as to set the second bearer. In this case, the radio station 1 is to trigger the second bearer configuration may be transmitted a bearer setting request to the higher level network 4. Furthermore, there is a second example is also of some the procedure for setting bearer is initiated (initiate) in response to a trigger of the radio station 1. Hereinafter, we outlined three examples of setting procedure of the second bearer (Step Examples 1-3).
[0041]
　In Step Example 1, the radio station 1 by sending a bearer setup request to the radio station 2, to trigger the radio station 2 to set the second bearer. In this case, the radio station 1, the terminal individual information of the wireless terminal 3 associated with the setting of the second bearer, the initial terminal information, and the non-access layer: sending at least one of (Non-Access Stratum NAS) information it 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 to the upper network 4 (i.e., the mobility management device). Subsequently, the upper network 4, performs bearer settings of the upper network 4 in response to the bearer setting 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 address, (b) bearer upper network 4 side about the endpoint identifier between radio station 2 and the upper network 4, (c) a second bearer QoS ( including Quality of Service) information. Then, the wireless station 2, based on the bearer setting information, the bearer between the radio station 2 and the upper network 4 (e.g., S1 bearer) sets a radio bearer between the wireless terminal 3 (e.g., EPS RB ) to set. Wireless station 2, after setting the second bearer may transmit the completion notice to the radio station 1. At this time, 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 radio station 1 by sending a bearer setup request to the higher level network 4, triggering the upper network 4 so as to set the second bearer. Next, the upper network 4, performs bearer settings of the upper network 4 in response to the bearer setting request from the radio station 1 notifies the bearer setting information for the second bearer to the radio station 1. Subsequently, the radio station 1 transfers at least a portion of the received bearer setup information to the radio station 2. Then, the wireless station 2, based on the bearer setting information, the bearer between the radio station 2 and the upper network 4 (e.g., S1 bearer) sets a radio bearer between the wireless terminal 3 (e.g., EPS RB ) to set. In procedure example 2, the radio station 1, both the upper network 4 or the wireless station 2, or thereof, the terminal individual information of the wireless terminal 3 associated with the setting of the second bearer, the initial terminal information, and the non-access layer information out may send at least one.
[0043]
　In Step Example 3, similarly to the procedure Example 2, the radio station 1 by sending a bearer setup request to the higher level network 4, triggering the upper network 4 so as to set the second bearer. Next, the upper network 4, as in the procedure Example 2, performs bearer settings of the upper network 4 in response to the bearer setting request from the radio station 1. However, the procedure example 3, a higher network 4, the wireless station 2 without the wireless station 1 notifies the bearer setting information relating to the second bearer. Then, the wireless station 2, based on the bearer setting information, the bearer between the radio station 2 and the upper network 4 (e.g., S1 bearer) sets a radio bearer between the wireless terminal 3 (e.g., EPS RB ) to set. In procedure example 3, the radio station 1 is in both the upper network 4 or the wireless station 2, or thereof, the terminal individual information of the wireless terminal 3 associated with the setting of the second bearer, the initial terminal information, and the non-access layer information out may send at least one. Further, the upper network 4, the setting of the upper network 4 for a second bearer (e.g., S1 bearer endpoint settings) after the completion of, at least one of the terminal individual information and non-access layer information of the wireless terminal 3 may be directly transmitted to the wireless station 1 may transmit a radio station 1 via a radio station 2.
[0044]
　In these steps through Step Example 3 above, the radio station 1, to set the radio bearer between the radio station 2 and the radio terminal 3, such as radio resource control information and radio resource configuration information related to the setting of the radio bearer it may notify to the radio station 2.
[0045]
　In these steps 1 through Step Example 3 above, the bearer setting information for the second bearer may comprise at least one of listed information elements below.
Bearer Information
, wireless terminal capability information
, wireless terminal identifier information
and selecting a network information
security information
[0046]
　Terminal individual information of the wireless terminal 3 associated with the setting of the second bearer may comprise at least one of listed information elements below.
And wireless terminal capability information
, wireless terminal identifier information
and selecting network information
, bearer information
, the radio resource control information
and wireless terminal movement history information
and services
[0047]
　The initial terminal information of the wireless terminal 3 associated with the setting of the second bearer may comprise at least one of the listed information elements below.
· Wireless terminal identifier information
and selecting the network information
, the wireless terminal area information
and wireless connection object (factor)
and non-access stratum data
[0048]
　Non-access layer information of the wireless terminal 3 associated with the setting of the second bearer may comprise at least one of the listed information elements below.
· Wireless terminal identifier information
and selecting network information
and non-access stratum data
[0049]
　The Apply of procedure example 1 to 3, the radio station that the first radio station 1 is to operate the large cells of relatively coverage (management), the second radio station 2 is operating a small cell coverage ( management) is a low power radio stations (low power Node: LPN) in which it if is considered, the invention is not limited to this. The LPN, for example, a radio station having the same functions as the radio station 1, when a functional compared to the radio station 1 is small new type of network node (New Node) is considered. The second cell may be a different new types of cells (New Cell Type) from the conventional to the new type of carrier (New Carrier Type) components different from the conventional.
[0050]
　Then hereinafter, the radio stations 1 and 2 according to the present embodiment, the wireless terminal 3, and an example of the configuration of a node of a higher network 4 (mobility management device 5 and the data relay device 6) will be described. Figure 2 is a block diagram showing a first configuration example of a radio station 1. Wireless communication unit 11 receives uplink signals transmitted to (uplink Signal) via the antenna from the wireless terminal 3. Reception data processing unit 13, restores the received uplink signal. Reception data obtained is transferred via the communication unit 14 to other network nodes, e.g., data relay apparatus or the 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 apparatus of the upper network. The control data of the non-access layer of the control data received from the wireless terminal 3 (Non-Access Stratum (NAS)) is transferred to the mobility management device of the upper network. Further, the reception data processing unit 13 receives the control data transmitted to the radio station 2 or the upper network 4 from the communication control unit 15, to the radio station 2 or higher network 4 via the communication unit 14 of this .
[0051]
　Transmission data processing unit 12 obtains the wireless terminal 3 addressed user data from the communication unit 14, error correction coding, rate matching, and generates a transport channel by performing interleaving and the like. Further, transmission data processing unit 12 generates a transmission symbol sequence by adding control information to the data series of the transport channel. Wireless communication unit 11, carrier modulation based on the transmission symbol sequence, frequency conversion, performs the processing such as signal amplification to generate a downlink signal (downlink Signal), and transmits it to the wireless terminal 3. Further, transmission data processing unit 12 receives the control data transmitted to the wireless terminal 3 from the communication control unit 15 transmits to the wireless terminal 3 via the wireless communication unit 11 of this.
[0052]
　The communication control unit 15, a signal (e.g., user data or control signals) cells 10 and 20 in order to be available at the same time in the wireless terminal 3 for receiving or transmitting the request to the radio station 2 or higher 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 local cell (cell 10).
[0053]
　Figure 3 is a block diagram showing a second configuration example of the radio station 2. The wireless communication unit 21 shown in FIG. 3, transmission data processing unit 22, the reception data processing unit 23, and the function and operation of the communication unit 24, corresponding elements of the radio station 1 shown in FIG. 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 communicates with at least one radio station 1 and higher-level network 4 in a second bearer setup procedure triggered by the wireless station 1, attributable to the cell 10 of the other radio station 1 wirelessly setting a second bearer for the terminal 3.
[0055]
　Figure 4 is a block diagram showing a configuration example of the wireless terminal 3. The wireless communication unit 31 is different supports carrier aggregation of a plurality of cells operated by the radio station, it is possible to use a plurality of cells for transmission or reception of user data (e.g., cell 10 and 20) at the same time . Specifically, the radio communication unit 31, via the antenna, receives downlink signals from 2 or both the radio station 1 or wireless station. Reception data processing unit 32 sends to restore the received data from the received downlink signal to the data control unit 33. Data control unit 33 utilizes in accordance with received data for that purpose. Further, transmission data processing unit 34 and the radio communication unit 31 generates an uplink signal by using the transmission data supplied from the data control unit 33, is transmitted to the 2 or both the radio station 1 or wireless station.
[0056]
　Communication control unit of the wireless terminal 3 35, the signal (e.g., user data or control signal) in order that the cells 10 and 20 receiving or for transmission simultaneously utilized in a wireless communication unit 31, the radio station 1 or set for the second bearer in response to an instruction from the radio station 2 (e.g., setting of the EPS RB, setting EPS bearer) is performed. Thus, the wireless terminal 3, communicate with the wireless station 1 (i.e., the user transmission or reception or both of the data) while, the wireless station 2 both can communicate. In one example, the communication control unit 35 may be a start of use of the indication of the second cell 20 is received from the first radio station 1.
[0057]
　Figure 5 is a block diagram showing a configuration example of a mobility management device 5 which is arranged above the network 4. Communication unit 51, the radio station 1 and 2 and communicates with the data relaying device 6 described later. Bearer setting control unit 52 communicates via a radio station 1 and 2 and the data relay device 6 and the communication unit 51, controls the setting of the bearer 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 request a bearer set in the data relay device 6, bearer setup for the second bearer and notifies the information to the radio station 1 or wireless station 2.
[0058]
　Normally, the wireless terminal 3, when connected to the upper network 4, radio station in the upper network 4 (e.g., wireless station 1) is managed in association with. For example, the mobility management device 5, in order to identify the wireless terminal 3 in the control connection between the wireless station 1, a network identifier (e.g., MME UE S1AP ID) associated with the radio station 1 may be granted. One radio station (e.g., wireless station 1), the normal CA that is operating multiple cells, the higher the network 4, as usual, be managed wireless terminal 3 in association with the radio station 1. However, if the CA using multiple cells 10 and 20 of different radio stations 1 and 2, the upper network 4, may manage the radio terminal 3 in association with a plurality of radio stations 1 and 2. Therefore, the mobility management device 5, for one of the wireless terminal 3, may be applied a plurality of network identifiers. The plurality of network identifiers, a first identifier for the control connection between the upper network 4 and the wireless station 1 identifies the wireless terminal 3, and the wireless terminal 3 in the control connection between the upper network 4 and the radio station 2 including a second identifier for identifying. Further, for the same wireless terminal 3 two network identifiers (e.g., MME UE S1AP ID and eNB UE S1AP ID) may be set. In this case, first network identifier (e.g., MME UE S1AP ID) one for the radio terminal 3, the second network identifier (e.g., eNB UE S1AP ID) is the upper network 4 and the wireless station 1 one for controlling connection between one further control connection between the upper network 4 and the wireless station 2, may be set, respectively.
[0059]
　Figure 6 is a block diagram showing a configuration example of a data relay apparatus 6 arranged on the upper network 4. The communication unit 61 includes first and second bearer between the radio station 1 and 2 (e.g., S1 bearer) is set to transmit and receive user data to and from the radio station 1 and 2. During the communication unit 64, a bearer between the other data relay apparatus or an external network of the upper network 4 (e.g., S5 / S8 bearer, or external bearer) is set, and other data relay apparatus or an external network in 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 and downstream side (e.g., S5 / S8 bearer and S1 bearer) for forwarding the downlink user data based on the correspondence between the . Received data processing unit 63 receives the uplink user data from the communication unit 61, two bearers (e.g., S5 / S8 bearer and S1 bearer) for forwarding the uplink user data based on the correspondence relationship.
[0061]
　Bearer control unit 65, and a mobility management device 5 and the signal 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 (e.g., S1 bearer), and other the data relay apparatus or the external network and between bearer (e.g., S5 / S8 bearer, or external bearer) is set.
[0062]
　Then hereinafter, the signal (e.g., user data or control information) to be made available simultaneously in the wireless terminal 3 the cells 10 and 20 for reception or transmission of, setting the first and second bearer It will be described a specific example of the procedure. First, the procedure in Example 1 described above were described with reference to FIGS. 7-11, the following procedure example 2 described with reference to FIGS. 12 to 15 will be described with reference to FIGS. 16-19 for the last procedure example 3 .
[0063]
(Procedure example 1)
　FIG. 7 is a flowchart showing operations of the radio station 1 in the procedure in Example 1. In step S101, the radio station 1 (communication control unit 15), by sending a request for setting the second bearer for the wireless terminal 3 belonging to the local cell 10 to the radio station 2, setting of the second bearer the trigger. In step S102, the radio station 1 determines whether it has received an acknowledgment from the wireless station 2 to the request in step S101. If an acknowledgment is not obtained (NO at step S102), the radio station 1 ends the process in FIG. On the other hand, when receiving an acknowledgment (YES at 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 the cell 10 an instruction to activate the cell 20 to the wireless terminal 3 (step S104).
[0064]
　Figure 8 is a flowchart showing operations of the radio station 2 in Step Example 1. In step S201, the radio station 2 (communication control unit 25) receives a message requesting the setting of the second bearers for communication in the wireless terminal 3 and the cell 20 belonging to the cell 10 from the radio station 1. In step S202, the radio station 2 determines whether to grant the request from the radio station 1. For example, the wireless station 2, if there is not enough radio resources for communicating with the wireless terminal 3 due to the high load of the cell 20, may reject the request from the radio station 1. Wireless station 2 sends a negative acknowledgment when rejecting the request from the radio station 1 to the radio station 1 (step S203), and sends an acknowledgment to the radio station 1 when permission (step S204).
[0065]
　If you grant the request from the radio station 1, radio station 2, and prepares for communication in the cell 20 of the wireless terminal 3. Specifically, in step S205, the radio station 2 requests the setting of the second bearer for the wireless terminal 3 to the upper network 4 (mobility management device 5). In step S206, the radio station 2 determines whether it has received the bearer setting 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 (e.g., S1 bearer setup, EPS RB setting) is performed. Then, the wireless station 2 sends an acknowledgment of the bearer setting to the higher level network 4 (step S207). Finally, the wireless station 2 notifies the completion of setting the second bearer to the radio station 1 (step S208). Acknowledgment bearer configuration includes, for example, bearer endpoint identifier for the downlink data received, which is set at the radio station 2.
[0066]
　Figure 9 is a flowchart showing the operation of the higher level network 4 in the procedure in Example 1. In step S301, a higher network 4 (mobility management device 5) receives a setting request of the second bearer for the wireless terminal 3 from the radio station 2. Upper network 4 in response to the request at step S301, transmits the bearer setting information second to the radio station 2 (step S302). In step S303, the upper network 4 determines reception of bearer setting acknowledgment from the second radio station 2. When receiving the acknowledgment bearer setup (YES in step S303), the upper network 4 is based on this acknowledgment, updating the bearer setting in the data relay device 6, to complete the setting of the second bearer (Step S304).
[0067]
　Figure 10 is a flowchart showing the operation of the wireless terminal 3 in the procedure in Example 1. In step S401, the wireless terminal 3 (a communication control unit 35) receives the instruction of the first cell 10 from the wireless station 1 of the start of use of the second cell 20. In step S402, the wireless terminal 3, in response to an instruction of the start of use, set the second cell 20. Specifically, the radio terminal 3, settings required for sending or receiving user data in the second bearer (e.g., address setting of the wireless terminal 3, EPS bearer endpoint configuration, radio bearer configuration, etc.) rows Ebayoi. In this case, the radio station 1 may further send and radio resource control setting information (Radio Resource Control (RRC) Configuration) and radio resource configuration information (Radio Resource Configuration). In step S403, the wireless terminal 3 reports the completion of setting the second cell 20 to the first radio station 1.
[0068]
　Figure 11 is a sequence diagram showing the entire procedure example 1. At step S501, the wireless terminal 3, the radio station 1 and higher-level network 4 sets the control bearer for transmitting and receiving control information via the wireless station 1 in the cell 10. Further, the wireless terminal 3, the radio station 1 and higher-level network 4 may set the first bearer for transmitting and receiving user data via the wireless station 1 in the cell 10. At step S502, the radio station 1 requests 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 (e.g., E-RAB) are, for transferring user data between the upper network 4 and the radio station 2 It includes a bearer (e.g., S1 bearer). In step 503, the wireless station 2 sends an acknowledgment or negative acknowledgment for the bearer setting request to the radio station 1. When sending an acknowledgment at step S503, the radio station 2 transmits a setting request of the second bearer to the upper network 4. Upper network 4 (mobility management device 5), in response to a request from the radio station 2, and controls the settings related to the second bearer in the data relay device 6. In step S505, a higher network 4 (mobility management device 5) instructs the setting for the second bearer to the radio station 2. The instruction includes a bearer setting information relating to the second bearer.
[0069]
　Wireless station 2 performs setting for the second bearer based on the bearer setting information, and transmits an acknowledgment of the bearer setting to the higher level network 4 (step S506). Further, the wireless station 2 notifies the completion of setting the second bearer to the radio station 1 (step S507). Wireless station 1, depending on the setting completion of the second bearer, transmits a use start notification 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 the setting completion report of the cell 20 to the radio station 1.
[0070]
　In step S502 of FIG. 11, the radio station 1 may transmit the following information when performing a bearer setting request. This information together with the request (i.e., in the same message) may be transmitted may be transmitted in a separate message.
Terminate individual information: For example, the wireless terminal capability information, wireless terminal identifier information, select the network information, the bearer information, the radio resource control information, the wireless terminal movement history information or service information, or any combination thereof;
Initial terminal information : for example, wireless terminal identifier information, select the network information, the wireless terminal area information, the wireless connection object (factors), or non-access stratum data, or any combination thereof;
and non-access layer information: for example, wireless terminal identifier information, select network information or non-access stratum data, or any combination thereof.
[0071]
　In step S507 of FIG. 11, the radio station 2 may transmit the following information when the setting completion notification of the second bearer. This information along with the notification (i.e., in the same message) may be transmitted may be transmitted in a separate message.
Terminate individual information: For example, the wireless terminal capability information, wireless terminal identifier information, select the network information, the bearer information, the radio resource control information, the wireless terminal movement history information or service information, or any combination thereof;
and non-access layer information: for example, wireless terminal identifier information, select the network information, or non-access stratum data, or any combination thereof.
[0072]
　In step S505 of FIG. 11, upper network 4, when setting instruction of the second bearer, (a) bearer information, (b) wireless terminal capability information, (c) a wireless terminal identifier information, selecting (d) network information, or (e) security information, or may send any combination thereof as bearer configuration information. This information together with the instruction (i.e., in the same message) may be transmitted may be transmitted in a separate message.
[0073]
(Procedure example 2)
　FIG. 12 is a flowchart showing operations of the radio station 1 in the procedure Example 2. At step S601, the radio station 1 (communication control unit 15), by sending a request for setting the second bearer for the wireless terminal 3 belonging to the local cell 10 to the upper network 4, setting of the second bearer the trigger. In step S602, the radio station 1 receives the setting instruction of the second bearer from the upper network 4. In step S603, the radio station 1 instructs the setting of the second bearer for the wireless terminal 3 to the radio station 2. At step S604, the radio station 1 determines the reception of the bearer setup completion notification from the wireless station 2. When receiving the bearer setup completion notification (YES in step S103), the radio station 1 notifies the completion of setting the second bearer to the upper network 4. Furthermore, the radio station 1 transmits the cell 10 an instruction to activate the cell 20 to the wireless terminal 3 (step S606). In this case, the radio station 1 may further send 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 higher level network 4 in the procedure Example 2. At step S701, the upper network 4 (mobility management device 5) receives a setting request of the second bearer for the wireless terminal 3 from the radio station 1. In step S702, the upper network 4 transmits a setting instruction of the second bearer to the radio station 1. The setting instruction includes a bearer setting information relating to the second bearer. At step S703, the upper network 4 determines reception of the bearer setting completion notification from the wireless station 1. Notification of completion of the bearer setting, for example, includes a bearer endpoint identifier for the downlink data received, which is set at the radio station 2. Upper network 4 on the basis of the completion notification may update the bearer setting in the data relay device 6.
[0075]
　Figure 14 is a flowchart showing operations of the radio station 2 in the procedure Example 2. At step S801, the radio station 2 (communication control unit 25) receives the setting instruction of the second bearer from the radio station 1. The setting instruction includes a bearer setting information relating to the second bearer. At step S802, the wireless station 2, bearer setup for the second bearer based on the bearer setting information (e.g., S1 bearer setup, EPS RB setting) is performed. In step S803, the radio station 2 notifies the completion of setting the second bearer to the radio station 1.
[0076]
　Operation of the wireless terminal 3 in the procedure Example 2 is similar to the operation in Step Example 1 shown in FIG. 10.
[0077]
　Figure 15 is a sequence diagram showing the entire procedure example 2. Processing in step S501 of FIG. 15 is the same as step S501 of the procedure Example 1 shown in FIG. 11. At step S902, the radio station 1 requests a second bearer for the wireless terminal 3, i.e. bearer via the cell 20 and the radio station 2 transfers the user data, the setting of the upper network 4. Upper network 4 (mobility management device 5), in response to a request from the radio station 2, and controls the settings related to the second bearer in the data relay device 6. In step S903, a higher network 4 (mobility management device 5) instructs the setting for the second bearer to the radio station 1. The instruction includes a bearer setting information relating to the second bearer.
[0078]
　At step S904, the radio station 1 instructs the setting of the second bearer to the radio station 2. Wireless station 2 performs setting for the second bearer based on an instruction from the radio station 1 transmits a completion notification of the bearer setup to 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 of the procedure Example 1 shown in FIG. 11.
[0079]
　Radio station 1 may transmit the following information when performing a bearer setting request in step S902 of FIG. 15. Furthermore, the radio station 1 may transmit the information even when an instruction of the bearer setup to the radio station 2 in step S904 of FIG. 15. This information together with the request (i.e., in the same message) may be transmitted may be transmitted in a separate message.
Terminate individual information: For example, the wireless terminal capability information, wireless terminal identifier information, select the network information, the bearer information, the radio resource control information, the wireless terminal movement history information or service information, or any combination thereof;
Initial terminal information : for example, wireless terminal identifier information, select the network information, the wireless terminal area information, the wireless connection object (factors), or non-access stratum data, or any combination thereof;
and non-access layer information: for example, wireless terminal identifier information, select network information or non-access stratum data, or any combination thereof.
[0080]
　Upper network 4, when setting instruction of the second bearer in step S903 of FIG. 15, (a) bearer information, (b) wireless terminal capability information, (c) a wireless terminal identifier information, (d) selecting the network information, or (e) security information, or may send any combination thereof as bearer configuration information. This information together with the instruction (i.e., in the same message) may be transmitted may be transmitted in a separate message.
[0081]
(Procedure example 3)
　FIG. 16 is a flowchart showing operations of the radio station 1 in the procedure Example 3. Processing in step S601 in FIG. 16 is the same as step S601 of the procedure example 2 of FIG. 12. In procedure example 3, in response to a setting request of the second bearer from the radio station 1 to the upper network 4, a higher network 4 to communicate with the wireless station 2, it 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 radio station 1 transmits a signal indicating the start of use of the second cell 20 in the first cell 10 of the wireless terminal 3 (step S1003). In this case, the radio station 1 may be further transmitted and radio resource control (RRC Configuration) information and radio resource configuration information (Radio Resource Configuration).
[0082]
　Figure 17 is a flowchart showing the operation of the higher level network 4 in the procedure Example 3. Processing in step S701 of FIG. 17 are similar to steps S701 procedure example 2 of FIG. 13. In step S1102, the higher the network 4 (mobility management device 5) transmits a setting instruction of the second bearer to the radio station 2. The setting instruction includes a bearer setting information relating to the second bearer. In step S1103, the higher the network 4 determines reception of the bearer setting completion notification from the wireless station 2. Notification of completion of the bearer setting, for example, includes a bearer endpoint identifier for the downlink data received, which is set at the radio station 2. Upper network 4 on the basis of the completion notification may update the bearer setting in the data relay device 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 the procedure 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 includes a bearer setting information relating to the second bearer. Step S802 of FIG. 18 is similar to that of FIG. 14. That is, the wireless station 2, bearer setup for the second bearer based on the bearer setting information (e.g., S1 bearer setup, EPS RB setting) is performed. In step S1203, the radio station 2 notifies the completion of setting the second bearer to the upper network 4.
[0084]
　Operation of the wireless terminal 3 in the procedure Example 3 is similar to the operation in Step Example 1 shown in FIG. 10.
[0085]
　Figure 19 is a sequence diagram showing the entire 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. 15. In step S1303, the higher the network 4 (mobility management device 5) instructs the setting for the second bearer to the radio station 2. The instruction includes a bearer setting information relating to the second bearer. In step S1304, the radio station 2 performs setting for the second bearer based on the instruction from the host network 4, transmits a completion notification of the bearer setting to the higher level network 4. In step S1305, the upper network 4 transmits a setting completion notification of the second bearer to the radio station 1. Processing in steps S508 and S509 in FIG. 19 are similar to steps S508 and S509 in Step Example 1 and Procedure Example 2 shown in FIGS. 11 and 15.
[0086]
　Upper network 4, when setting instruction of the second bearer in step S1303 in FIG. 19, (a) bearer information, (b) wireless terminal capability information, (c) a wireless terminal identifier information, (d) selecting the network information, or (e) security information, or may send any combination thereof as bearer configuration information. This information together with the instruction (i.e., in the same message) may be transmitted may be transmitted in a separate message.
[0087]

　In the present embodiment, an example of applying the first embodiment described above in 3GPP LTE system. Radio station 1 and 2 corresponds to eNB, the radio terminal 3 corresponds to UE, the upper network 4 corresponds to the core network (EPC). Further, the mobility management device 5 contained in the higher level network 4 corresponds to the MME (Mobility Management Entity), the data relaying device 6 corresponds to a combination of S-GW or S-GW and P-GW. Here, between the radio stations (i.e., inter-eNB) transmitting and receiving information may be used X2 is a direct interface, it may be used S1, which is an interface through the core network, or a new interface defined (e.g., X3) may be used. The radio station (i.e., eNB) and an upper network (i.e., EPC) transmission and reception of information between may be used is a direct interface S1 (also referred to as S1-MME, S1-U) , a new it may be used an interface defined. The first and second bearer, for example, corresponds to S1 bearer E-RAB or EPS bearers. Control bearer, for example, UE-associated logical S1-connection, S1-MME, or a radio station (i.e. eNB) signaling radio bearer for transmitting the C-plane control information to the wireless terminal (i.e. UE) via a (Signaling Radio Bearer: corresponds to the SRB).
[0088]
　Wireless terminal (UE) 3 supports a plurality of different cells carrier aggregation operated by radio station (eNB) (Inter-eNB CA). Here the "Inter-eNB CA" is actually different cell signal eNB (e.g., user data and control information) limited to receiving or transmitting simultaneously is not the sole, the signal in both the cells of different eNB While in the state capable of receiving or transmitting to actually receive or transmit signals at the cell of one of the eNB that, to receive or transmit different types of signals in the respective cells of different eNB or it comprises the use of respective cells of different eNB to any of the signals received or transmitted, and the like.
[0089]
　In the following, the radio station 1 and 2 the eNB1 and 2, the wireless terminal 3 to UE3, upper network 4 EPC4, the mobility management device 5 MME5, illustrating a data relay device 6 as S-GW6. Figure 20 is a block diagram showing a configuration example of a wireless 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 establishes already first radio connection in the first cell of the eNB1 (RRC Connection Established), if you have completed the setting of the bearer, further second bearer in the second cell of the other eNB2 performing the setting of, UE3 processing load becomes very large. In contrast, in the present embodiment, the trigger setting eNB1 of the second bearer, executes 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]
　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 transmitted from eNB1, the user data based signal (User Plane (UP) signal) may also be sent from eNB2.
[0092]
　Setting procedure of specific second bearer in the present embodiment may be similar to the first embodiment. That, eNB1 by sending a bearer setup request to the eNB2 or EPC4, triggers the setting of the second bearer. EPC4 may control the second bearer setup triggered by eNB1. Thus, this embodiment differs eNB1 and in order to realize the carrier aggregation of the cells 10 and 20 operated by 2, at the same time bearers for UE3 in multiple cells 10 and 20 (e.g., control bearer, S1 bearer, E-RAB, or EPS bearer) can be set.
[0093]
　Setting of the second bearer may be performed in accordance with one of the procedures Examples 3-6 corresponding to these steps 1 to 3 described in the first embodiment. Procedure example 4 corresponds to the procedure in Example 1 of the first embodiment. In procedure example 4, eNB1 by sending a bearer setup request to eNB2, triggers the eNB2 to set the second bearer. At this time, eNB1 is, UE3 terminal individual information relating to the setting of the second bearer (UE Context information), the initial terminal information (Initial UE message), and at least one of the non-access layer information (NAS information) it may be sent. Then, eNB2 transmits a setting request of the second bearer EPC4 (MME5). EPC4 not only conducts bearer setting in EPC4, notifies the bearer setting information regarding the second bearer (Bearer Configuration information) to the eNB2. Then, eNB2, based on the bearer setting information, the bearer (e.g., S1 bearer) between the eNB2 and EPC4 sets a, it sets a radio bearer between the UE3 (e.g., EPS RB). eNB2 after setting of the second bearer may transmit a completion notification to eNB1. At this time, completion notification may include UE3 terminal individual information, and at least one of the non-access layer information.
[0094]
　Step Example 5 corresponds to the procedure example 2 of the first embodiment. In Step Example 5, eNB1 by sending a bearer setup request to EPC4, triggers the PEC4 to set the second bearer. EPC4 not only conducts bearer setting in EPC4 in response to the bearer setup request from eNB1, and notifies the bearer setting information regarding the second bearer (Bearer Configuration information) to the eNB1. eNB1 transfers at least part of the bearer setup information to the eNB2. eNB1 is to EPC4 or eNB2 or both, UE3 terminal individual information (UE Context information) associated with the setting of the second bearer, the initial terminal information (Initial UE message), and the non-access layer information (NAS information) it may send at least one of.
[0095]
　Procedure example 6 corresponds to step 3 of the first embodiment. In Step Example 6, similarly to the procedure Example 3, eNB1 by sending a bearer setup request to EPC4, it triggers the EPC4 to set the second bearer. EPC4 not only conducts bearer setting in EPC4, notifies the bearer setting information regarding the second bearer (Bearer Configuration information) to the eNB2. eNB2, based on the bearer setting information, set for the second bearer (E-RAB Setup) performed. In Step Example 6, eNB1 is to EPC4 or eNB2 or both terminal individual information (UE Context information) of the wireless terminal 3 associated with the setting of the second bearer, the initial terminal information (Initial UE message), and non it may send at least one of the access layer information (NAS information). Further, EPC4 is set in EPC4 for the second bearer (e.g., end-point configuration S1 bearer) after the completion of, at least one of UE3 terminal individual information and non-access layer information directly to the eNB1 sends it may be, may be transmitted to the eNB1 through eNB2.
[0096]
　In procedure example 4 through Step Example 6 above, eNB1 performs setting of a radio bearer between the eNB2 and UE3, the radio resource control information (RRC Configuration) related to the setting of the radio bearer and radio resource configuration information (Radio Resource Configuration) may be notified to eNB2, and the like.
[0097]
　In procedure example 4 through Step Example 6 above, the bearer setting information may include at least one of 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 thereof;
and wireless terminal capability information (UE capability information): for example, UE radio access capability, UE network capability, or UE security capability data, or any combination thereof;
and wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or their 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 include at least one of listed information elements below.
· Wireless terminal capability information (UE capability information): for example, UE radio access capability, UE network capability, or UE security capability data, or any combination thereof;
and wireless terminal identifier information (UE identification information): for example, C-RNTI , (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting a network information (UE selected network information): for example, GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or their 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 thereof;
and wireless terminal movement history information (UE hist ory 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 listed information elements below.
· Wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting a 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 wireless terminal area information (UE are information): for example, Tracking area ID (TAI), or EUTRAN Cell Global ID (ECGI), or combinations thereof;
and wireless connection object (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 include at least one of listed information elements below.
· Wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or any combination thereof;
and selecting a 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;
and non-access layer connection object (factor) (NAS connection purpose information): for example, NAS cause;
[0101]
　Here, as the RRC Establishment cause or NAS cause, for example, Secondary cell configuration (or setup), Secondary bearer configuration (or setup), target bearer configuration (or setup), or virtual bearer configuration (or setup), etc. define the it may be.
[0102]
　The Apply these steps Examples 4 through Step Example 6, eNB1 operational relatively large macrocells coverage (Management) macro radio base station: a (Macro eNB MeNB), eNB2 operational small cell coverage ( management) is a low power radio stations (low power Node: LPN) in which it if is considered, the invention is not limited to this. The LPN, for example MeNB and pico radio base station having the same function (Pico eNB: PeNB) and, cases can be considered a less functional than the MeNB new type of network node (New Node).
[0103]
　Then hereinafter, a specific example of procedure example 4 through Step Example 6 described above. Figure 21 is a sequence diagram showing the entire procedure example 4, FIG. 22 is a sequence diagram showing the entire procedure example 5, FIG. 23 is a sequence diagram showing the entire procedure example 5.
[0104]
(Procedure example 4)
　In step of FIG. 21 S1401, 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 transmits a setting request of a second bearer for the U3 to eNB2 (Bearer Setup Request). In step 1403, eNB2 transmits a setting request of 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. In step S1405, EPC4 (MME5) indicates the setting for the second bearer eNB2 (Initial Context Setup Request). The instruction includes a bearer setting information relating to the second bearer. Instead of Initial Context Setup Request message, for example, E-RAB Setup Request message, or E-RAB Modify Request message, or the like may be used.
[0105]
　eNB2 performs setting for the second bearer based on the bearer setting information. In step S1406, eNB2 transmits an acknowledgment bearer set EPC4 (Initial Context Setup Response). Instead of Initial Context Setup Response message, for example, E-RAB Setup Response message, or E-RAB Modify Response message, or the like may be used. In step S1407, eNB2 informs the completion of setting the second bearer eNB1 (Bearer Setup Complete). In step S1408, eNB1 transmits a use start notification of the second cell 20 in the cell 10 to the UE3 (Secondary Cell Configuration / Activation).
[0106]
(Procedure example 5)
　process in the step S1401 in FIG. 22 are similar to steps S1401 in FIG. In step S1502, eNB1 requests the setting of the second bearer for UE3 in EPC4 (Bearer Setup Request). EPC4 (MME5) in response to a request from eNB2, controls the setting for the second bearer in S-GW6. In step S1503, EPC4 (MME5) indicates the setting for the second bearer eNB1 (Initial Context Setup Request). Instead of Initial Context Setup Request message, for example, E-RAB Setup Request message, or E-RAB Modify Request message, or the like may be used. The instruction includes a bearer setting information relating to 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 an 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 transmits a setting completion notification of the second bearer EPC4 (Bearer Setup Complete). Processing in step S1408 in FIG. 22 are similar to steps S1408 in FIG.
[0108]
(Procedure example 6)
　processing in steps S1401 and S1502 in FIG. 23 are similar to steps S1401 and S1502 of the procedure Example 2 shown in FIG. 22. In step S1603, EPC4 (MME5) indicates the setting for the second bearer eNB2 (Initial Context Setup Request). Instead of Initial Context Setup Request message, for example, E-RAB Setup Request message, or E-RAB Modify Request message, or the like may be used. The instruction includes a bearer setting information relating to the second bearer. In step S1604, eNB2 performs setting for the second bearer based on an instruction from EPC4, transmits a notification of completion of bearer set EPC4 (Initial Context Setup Response). Instead of Initial Context Setup Response message, for example, E-RAB Setup Response message, or E-RAB Modify Response message, or the like may be used. In step S1605, EPC4 transmits 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 Procedure Example 2 shown in FIGS. 11 and 15.
[0109]

　In the present embodiment describes a variation of the second embodiment described above. In LTE system, the transmission path for transmitting the downlink user data to UE3 in the second cell 20 (i.e., the path of the second bearer) as, for example, can be considered the following three routes.
· ALT1: forwards all downlink user data from the P / S-GW6 the eNB2 (eg LPN), these eNB2 sends to UE3.
· ALT2: transferred to a portion of the downlink user data from the P / S-GW6 eNB1 (eg MeNB), and transfers the other from P / S-GW6 the eNB2 (eg LPN). Each of the eNB1 and eNB2 transmits downlink user data to UE3.
· ALT3: to transfer all of the downlink user data from the P / S-GW6 to eNB1 (eg MeNB). Then forwards some or all of the downlink user data as needed eNB1 to eNB2 (eg LPN). Each of the eNB1 and eNB2 transmits downlink user data to UE3.
　Incidentally, ALT1 is, eNB1 is the role of a proxy (or router), it is conceivable for transferring downlink user data to the eNB2 through the eNB1 from P / S-GW6.
[0110]
　On the other hand, the control information for UE3 (Control Plane Information) is transferred from the essentially MME5 to eNB1 (eg MeNB), it is considered that eNB1 sends it to the UE3. The following describes the path of the control information as a prerequisite. Figure 24 shows the path of ALT1 ~ ALT3, and control information for downlink user data path described above. However, the control information path of this embodiment is not limited thereto. For example, control information, like the user data may be transmitted to eNB2 via the eNB1 from MME5, it may be directly transmitted to eNB2 from MME5.
[0111]
　Hereinafter, a specific example of a procedure of changing the downlink user data path associated with 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 a E-RAB passing through the S1 bearer or eNB2 is set between EPC4 the eNB2. Then, eNB1 requests the MME5 to change some or all of the path of the downlink user data to UE3 in via eNB1. MME5, in response to a request from eNB1, (here, S-GW only, or both S-GW and P-GW) a change request of the downlink user data path P / S-GW6 be sent to. P / S-GW6 by updating the bearer setting (Bearer Context) in response to a request MME5, reroute downlink user data. The change request of the downlink user data path S-GW only, or to send to either of both S-GW and P-GW, for example, necessity of a path change of the core network bearer (S5 / S8 bearer), or P-GW in the applied packet filters in downlink user data: is determined based on the necessity of change of (Traffic Flow Template TFT).
[0112]
　When using different routes depending UE3 addressed downlink user data (i.e. ALT2 or ALT3), it is necessary to divide the downlink user data to a plurality of data flows. This division is, for example, the type of service 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 line Ebayoi. Switching between these UE units or service (QoS, QCI) downlink user data path in a unit, the delay may be performed 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. FIG. 25 is a modification of the sequence diagram of the 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. 21. In step S1709, eNB1 transmits a switching request of the downlink user data path MME5 ((Partial) Path Switch Request). In step S1710, MME5 requests to change the bearer context or packet filter P / S-GW6 ((Partial) U-Plane Update Request). In step S1711, P / S-GW6 based on a request MME5, by updating the bearer context or packet filter to change some or all of the path of the downlink user data addressed to UE3. In step S1712, P / S-GW6 notifies the completion of the route change in 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 to eNB1 part of user data, when transferring the remaining user data to the eNB2, the type of user data (e.g., service or QoS) to set a transfer destination for each are doing. That, Partial Path Switch Request, Partial U-Plane Update Request, and Partial Path Switch Request ACK etc., are applied in implementing ALT2 above.
[0114]
　FIG. 25 is shown as a modification of the procedure Example 4, the procedure of changing the downlink user data path of the present embodiment, it is naturally applicable to a procedure example 5 or procedure example 6.
[0115]

　In the second and third embodiments described above, UE3 includes the uplink physical control channel in the secondary cell (cell 20) (physical uplink control channel: PUCCH) Layer 1 or Layer 2 or with both of these control information (L1 / L2 control information) may be transmitted. Specifically, UE3 is a response to the downlink reception of the secondary cell (cell 20) (e.g., H-ARQ (Hybrid Automatic Repeat Request) ACK, CQI (Channel Quality Indicator) / PMI (Precoding Matrix Indicator), or RI to reply (Rank Indicator)), it may be used PUCCH secondary cell (cell 20).
[0116]
　In conventional CA the same eNB to operate a plurality of cells are all L1 / L2 control information using the PUCCH are transmitted in the primary cell. However, when employing the same architecture and normal CA in Inter-eNB CA, it requires interworking between eNB1 and eNB2, which may result in processing delays and additional network load. In contrast, by using the physical uplink control channel of the secondary cell (cell 20) for a response such as for the downlink reception of the secondary cell (cell 20), it becomes unnecessary interworking between eNB1 and eNB2 .
[0117]

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

　In the first to third embodiments, the primary cell (cell 10) and a secondary cell (cell 20) may be different duplex modes (duplex mode). For example, the primary cell (cell 10) 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 wireless station 1 (e.g., eNB1) is, the wireless terminal 3 (e.g., UE3) the second radio station in the second cell 20 2 (e.g., eNB2) showing an operation that triggers the setting of the second bearer for transmission or reception of user data via the. Furthermore, in the case where the second bearer release (Release), the first radio station 1 may trigger the bearer release. For example, the procedure in Example 1 or 4 above, the radio station 1 (e.g., eNB1) in response to a request (i.e., trigger), the radio station 2 (e.g., eNB2) is higher network 4 (e.g., EPC4 (i.e., MME5 )) to make configuration request of the second bearer. Similarly, when releasing the second bearer, the radio station 2, the second bearer released 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 (E-RAB release Indication) may be transmitted.
[0120]
　In Step Example 2 or 5 above, the radio station 1 (e.g., eNB1) is higher network 4 (e.g., EPC4 (i.e., MME5)) to set request for a second bearer, the higher the network 4 is a second bearer set the radio station 2 via a radio station 1 (for example, eNB2) notifies the configuration information of the second bearer. Similarly, when releasing the second bearer, the radio station 1, the second bearer release request to the higher level network 4 (E-RAB Release Request) may be performed. Next, the upper network 4 in response to the release request of the second bearer release the second bearer may be performed release instruction of the second bearer to the radio station 1 (E-RAB Release Command) . Then, the radio station 1 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 bearer (E-RAB Release Complete) Top it may be notified to the network 4.
[0121]
　In procedure example 3 or 6 above, the radio station 1 (e.g., eNB1) is higher network 4 (e.g., EPC4 (i.e., MME5)) to set request for a second bearer, the higher the network 4 is a second bearer set the radio station 2 (e.g., eNB2) notifies the configuration information of the second bearer. Similarly, when releasing the second bearer, the radio station 1, the second bearer release request to the higher level network 4 (E-RAB Release Request) may be performed. Next, the upper network 4 in response to the release request of the second bearer release the second bearer, and notify the release instruction of the second bearer (E-RAB Release Command) to the radio station 2 good. Then, the wireless station 2 releases the second bearer in response to the release instruction, the completion of the release of the second bearer (E-RAB Release Complete) may notify the higher-level network 4. Thus, the wireless terminal 3 (e.g., UE3) when is carrier aggregation of cells of different radio stations, the release of the second bearer which has been used for transmission or reception of user data in the secondary cell, the radio terminal 3 of the load can be achieved without increasing.
[0122]

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

　wireless station 1 (the communication control unit 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), a mobility management device 5 (bearer setting control unit 52), and bearer control method by the data relaying device 6 (bearer control unit 65) may be realized either by using a semiconductor processing apparatus including an Application Specific Integrated Circuit (ASIC). Further, these processes may be realized by executing a program on a computer system that includes at least one processor (eg a 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 a sequence diagram in a computer system, it may be supplied to the program in the computer.
[0124]
　This program is stored using a non-transitory computer readable media of various types (non-transitory computer readable medium), can be supplied to the computer. Non-transitory computer readable media include with various types of entities (tangible storage medium). Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tape, hard disk drive), magneto-optical recording medium (e.g. optical disk), CD-ROM (Read Only Memory), CD-R, CD-R / W, a semiconductor memory (e.g., a mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) including. The program may be provided to a computer using a temporary 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, wired communication path such as electrical wires and optical fibers, or via a wireless communication path can provide the program to a computer.
[0125]

　In the first to third embodiments have been described primarily in the context of a LTE system. However, these embodiments are non-LTE system radio communication system, for example, 3GPP UMTS (Universal Mobile Telecommunications System ), 3GPP2 CDMA2000 systems (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 only examples for the application of technical ideas obtained by the present inventor. In other words, the technical idea is not limited to the embodiments 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 SYMBOLS
[0128]
1 radio station
2 radio station
3 radio terminal
4 upper network
5 mobility management device
6 data relay device
15 communication control unit
25 communication control unit
35 communication control unit
52 bearer setting control unit
65 bearer control unit

CLAIM

The scope of the claims

[Requested item 1]A first radio station to operate the first cell,
　and a second radio station to operate the second cell,
　the second while the first wireless connection in the first cell has been established and a wireless terminal having a function of establishing a second wireless connection in a cell,
　and the upper network capable of transmitting or receiving a signal to and from the wireless terminal through the first and second radio station,
the provided,
　said upper network sets a control bearer for transmitting a control signal related to at least the wireless terminal between the first radio station and the upper network, the upper network and the second radio station is configured to set a second bearer for transferring user data relating to the wireless terminal between,
　the first radio station is configured to trigger the setting of the second bearer
Wireless communication system.
[Requested item 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.
[Requested item 3]
　The first radio station, by transmitting a setting request of the second bearer to the upper network, to trigger the higher-level network to set the second bearer, according to claim 1 or 2 wireless communication system.
[Requested item 4]
　The first radio station, by sending a request to the second radio station, 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,
a wireless communication system according to claim 1 or 2.
[Requested item 5]
　The upper network in response to the setting request, starts the setting of the second bearer, the radio communication system according to claim 3 or 4.
[Requested item 6]
　The upper network notifies the setting information of the second bearer to the first or second radio station, a radio communication system according to any one of claims 1 to 5.
[Requested item 7]
　The first radio station, in response to the setting of the second bearer is completed, it instructs a start of use of the second cell to the radio terminal, to any one of claims 1 to 6, the wireless communication system according.
[Requested item 8]
　The second radio station establishes the second wireless connection with the wireless terminal, transmitting or receiving the user data to and from the wireless terminal, according to any one of claims 1 to 7 of the wireless communication system.
[Requested item 9]
　The first bearer includes bearer between the first radio station and the upper network, and at least one bearer between the upper network and the wireless terminal via the first radio station ,
　the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the wireless terminal and the higher-level network via the second radio station including radio communication system according to claim 2.
[Requested item 10]
　The second radio station notifies the at least one in the first 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 layer information the wireless communication system according to any one of claims 1-9.
[Requested item 11]
　The first radio station notifies the at least one said second wireless station 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 layer information the wireless communication system according to any one of claims 1 to 10.
[Requested item 12]
　Setting information of the second bearer, at least one of (a) bearer information, (b) wireless terminal capability information, (c) a wireless terminal identifier information, (d) selecting the network information, and (e) security information including, radio communication system according to claim 6.
[Requested item 13]
　The terminal individual information, (a) 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 movement history information, and at least one of (g) the service information, the wireless communication system according to claim 10 or 11.
[Requested item 14]
　The initial terminal information, (a) a wireless terminal identifier information, (b) selecting network information, (c) radio terminal area information, (d) a wireless connection object or factors, and (e) at least one of the non-access stratum data One containing, radio communication system according to claim 10 or 11.
[Requested item 15]
　The non-access layer information, (a) a wireless terminal identifier information, (b) selecting includes network information, and at least one of (c) non-access stratum data, the wireless communication system of claim 10 or 11.
[Requested item 16]
　The upper network sets a plurality of network identifiers to the radio terminal, the radio communication system according to any one of claims 1 to 15.
[Requested item 17]
　Wherein the plurality of network identifiers, a first identifier for identifying the wireless terminal in the control connection between the said upper network first radio station, and between the second radio station and the upper network in control connection includes a second identifier for identifying the wireless terminal, a wireless communication system according to claim 16.
[Requested item 18]
　The first radio station, (a) that the wireless terminal detects the second cell, (b) when a 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 requested the predetermined type of service, to trigger the setting of the second bearer, the radio communication system according to any one of claims 1 to 17.
[Requested item 19]
　The first cell is a primary cell,
　said second cell is a secondary cell,
　the radio terminal, of the Layer 1 control information using a physical uplink control channel in the second cell and Layer 2 control information transmitting at least one,
radio communication system according to any one of claims 1 to 17.
[Requested item 20]
　A first radio station to operate the first cell,
　the wireless communication means for operating the first cell,
　the second while the first wireless connection in the first cell has been established a communication control means for controlling the communication with the radio terminal having a function of establishing a second wireless connection in a second cell operated by a radio station,
　said communication control means,
　wherein the upper network first radio it sets the control bearer for transmitting a control signal related to at least the wireless terminal between the stations,
　the higher-level network and between the second for transferring user data relating to the wireless terminal of the second radio station It triggers the bearer setting,
the first radio station.
[Requested item 21]
　Wherein the communication control means further sets a first bearer for transferring the user data between the first of the upper network and the radio station, the first radio station according to claim 20.
[Requested item 22]
　It said communication control means, by sending a request to the upper network, to trigger the higher-level network to set the second bearer, the first radio station according to claim 20 or 21.
[Requested item 23]
　Said communication control means, by sending a request to the second radio station, triggering the second radio station to set the second bearer, the first according to claim 20 or 21 radio stations.
[Requested item 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.
[Requested item 25]
　Said communication control means, in response to the setting of the second bearer is completed, it instructs a start of use of the second cell to the radio terminal, according to any one of claims 21-24 the first radio station.
[Requested item 26]
　The first bearer includes bearer between the first radio station and the upper network, and at least one bearer between the upper network and the wireless terminal via the first radio station ,
　the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the wireless terminal and the higher-level network via the second radio station including, a first wireless station of claim 21.
[Requested item 27]
　Said communication control means receives said terminal-specific 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 clauses 21 to 26.
[Requested item 28]
　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 non-access layer information to the second radio station, wherein the first radio station according to any one of claim 21-27.
[Requested item 29]
　The first radio station, (a) that the wireless terminal detects the second cell, (b) when a 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 requested the predetermined type of service, to trigger the setting of the second bearer, the first radio station according to any one of claims 21-28.
[Requested item 30]
　A second radio station to operate the second cell,
　and radio communication means for operating the second cell,
　the first radio connection established in the first cell operated by a first radio station a communication control means for controlling the 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 an instruction from the first triggered upper network to the radio 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.
[Requested item 31]
　Wherein the communication control means is responsive to a request or an instruction from the first radio station sets the second bearer, the second radio station according to claim 30.
[Requested item 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.
[Requested item 33]
　The second bearer includes said upper network the second bearer between the radio stations, and at least one bearer between the second of said wireless terminal and the higher-level network via radio station , the second radio station according to any one of claims 30-32.
[Requested item 34]
　A wireless terminal used in conjunction with a wireless communication system according to any one of claims 1 to 19,
　the radio communication means and,
　said the instruction of the start of the second cell the first radio received from a station to establish a second wireless connection between the first wireless connection has been established, and controls the wireless communication unit to receive or transmit user data in at least the second cell communication and control means,
comprising a wireless terminal.
[Requested item 35]
　It said communication control means, said associated terminal individual information to the setting of the second bearer is received from the initial terminal information, and the first radio station at least one of the non-access layer information, according to claim 34 of the wireless terminal.
[Requested item 36]
　A network apparatus disposed in the upper network,
　a second operated by the second radio station while the first radio connection in a first cell that is operated by the first radio station has been established a control means for controlling the setting of the bearer for a wireless terminal having a function of establishing a second wireless connection in the cell,
　wherein,
　at least through the first radio station in the first cell controls the upper network so as to set control bearer for transmitting or receiving a control signal related to the wireless terminal,
　the bearer of the said first of said first or second radio station is triggered by a radio station in response to the setting request, the to via the second radio station in the second cell to set a second bearer for transmitting or receiving user data Position to control the network,
the network device.
[Requested item 37]
　Wherein said control means further controls the upper network so as to set the first bearer for transmitting or receiving the user data through the first radio station in the first cell, to claim 36 network device as claimed.
[Requested item 38]
　Wherein said control means notifies the setting information of the second bearer to the first or second radio station, the network device according to claim 36 or 37.
[Requested item 39]
　The first bearer includes bearer between the first radio station and the upper network, and at least one bearer between the upper network and the wireless terminal via the first radio station ,
　the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the wireless terminal and the higher-level network via the second radio station including network device according to claim 37.
[Requested item 40]
　It said control means sets a plurality of network identifiers to the wireless terminal, a network device according to any one of claims 36-39.
[Requested item 41]
　Wherein the plurality of network identifiers, a first identifier for identifying the wireless terminal in the control connection between the said upper network first radio station, and between the second radio station and the upper network in control connection includes a second identifier for identifying the wireless terminal, a network device according to claim 40.
[Requested item 42]
　A bearer control method in the first radio station to operate the first cell,
　a second operated by the second radio station while the first wireless connection in the first cell has been 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 the wireless terminals between said upper network first radio station, and
　that, to trigger the setting of the second bearer for transferring user data relating to the wireless terminal between the second radio station and the upper network
comprising a bearer control method.
[Requested item 43]
　Wherein between the upper network and the first wireless station by setting the first bearer for transferring user data for the wireless terminal further comprises a bearer control method according to claim 42.
[Requested item 44]
　It is by sending a request to the upper network, comprising triggering the upper network to set the second bearer, the bearer control method according to claim 42 or 43 to the trigger.
[Requested item 45]
　That said trigger, by sending a request to the second radio station, comprising triggering said second radio station to set the second bearer, according to claim 42 or 43 bearer control method.
[Requested item 46]
　Further comprising, the bearer control method according to any one of claims 42-45 to receive setting information of the second bearer from the upper network.
[Requested item 47]
　Depending on the setting of the second bearer is completed, further comprising using a start of the second cell to instruct the wireless terminal, bearer control according to any one of claims 42-46 Method.
[Requested item 48]
　The first bearer includes bearer between the first radio station and the upper network, and at least one bearer between the upper network and the wireless terminal via the first radio station ,
　the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the wireless terminal and the higher-level network via the second radio station including, bearer control method according to claim 43.
[Requested item 49]
　A bearer control method in the second radio station to operate the second cell,
　in response to a request or instruction from the request or instruction or the first triggered upper network to the wireless station from the first radio station to, in a wireless terminal having a function of establishing a second wireless connection in the second cell while the first radio connection in a first cell that is operated by the first radio station has been established Therefore, the comprising setting a second bearer for transferring user data relating to the wireless terminal between the second radio station and the higher-level network, the bearer control method.
[Requested item 50]
　A communication control method in a radio 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 use the start of the second cell received from the second radio connection established between the first wireless connection has been established, it comprises controlling so as to receive or transmit user data in at least the second cell,
the communication control method .
[Requested item 51]
　A bearer control method in a network device disposed in the upper network,
　is managed by the second radio station while the first radio connection in a first cell that is operated by the first radio station has been established for a wireless terminal having a function of establishing a second wireless connection in a second cell that transmits or receives a control signal related to at least the wireless terminal via the first radio station in the first cell controlling the upper network so as to set control bearer for, and
　in response to a setting request of the first bearer from the first or second radio station triggered by a radio station, the second It said upper net to the cell via the second wireless station sets a second bearer for transmitting or receiving user data related to the wireless terminal Controlling the workpiece,
comprising a bearer control method.
[Requested item 52]
　Further comprising controlling the upper network so as to set the first bearer for transmitting or receiving the user data through the first radio station in the first cell, according to claim 51 bearer control method.
[Requested item 53]
　The first bearer includes bearer between the first radio station and the upper network, and at least one bearer between the upper network and the wireless terminal via the first radio station ,
　the second bearer, the bearer between the second radio station and the upper network, and at least one bearer between the wireless terminal and the higher-level network via the second radio station including, bearer control method according to claim 52.
[Requested item 54]
　The 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 comprising
　the in the first cell 1 second for a wireless terminal having a function of establishing a second wireless connection in a second cell operated by a radio station, said the upper network first radio station while the radio connection has been established at least the setting the control bearer for transmitting control signals for the wireless terminal, and between the
　second bearer for transferring user data for the wireless terminal between the second radio station and the upper network to trigger the setting of,
including computer readable media.
[Requested item 55]
　The non-transitory computer readable medium storing a program for causing a bearer control method in the second radio station to operate a second cell in a computer,
　the method comprising a request from a first radio station or instruction or in response to a request or an instruction from the first triggered upper network to the wireless station, the first wireless connection has been established in the first cell operated by the first radio station for a wireless terminal having a function of establishing a second wireless connection in the second cell during, first for transferring the user data relating to the wireless terminal between the second radio station and the upper network It includes setting a second bearer,
computer-readable media.
[Requested item 56]
　The 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 ,
　said method comprising the instruction of the start of the second cell is received from the first radio station, the second radio connection established between the first wireless connection has been established, at least the and controlling so as to receive or transmit user data in the second cell,
computer-readable media.
[Requested item 57]
　The non-transitory computer readable medium storing a program for causing a bearer control method in a network device disposed in the upper network to the computer,
　the method comprising
　a 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 cell controlling the upper network so as to set control bearer for transmitting or receiving a control signal related to at least the wireless terminal via the first radio station in, and
　said triggered by the first radio station in response to the setting request bearer from the first or second radio station, via said second radio station in the second cell Controlling the upper network to set a second bearer for transmitting or receiving user data related to the line terminal,
comprising a computer readable medium.