WO2014054201A1 - 無線通信システム、無線局、無線端末、通信制御方法、及びコンピュータ可読媒体 - Google Patents
無線通信システム、無線局、無線端末、通信制御方法、及びコンピュータ可読媒体 Download PDFInfo
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- WO2014054201A1 WO2014054201A1 PCT/JP2013/003739 JP2013003739W WO2014054201A1 WO 2014054201 A1 WO2014054201 A1 WO 2014054201A1 JP 2013003739 W JP2013003739 W JP 2013003739W WO 2014054201 A1 WO2014054201 A1 WO 2014054201A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to a wireless communication system in which a wireless station and a wireless terminal communicate using a plurality of cells.
- 3GPP LTE Long Term Evolution
- eNode B eNB
- UE User Equipment
- CA Carrier Aggregation
- FIG. 17 illustrates an example in which the UE performs CA on the first cell (Cell1) and the second cell (Cell2) operated by the eNB.
- UE and eNB establish a wireless connection in the first cell (RRC Connection Establishment).
- the UE receives downlink data from the eNB in the first cell (Downlink data on Cell1).
- the first cell is a primary cell (Primary cell: PCell).
- step S3 eNB judges that it is necessary to set a secondary cell (Secondary cell: SCell) in UE, and sets the second cell as SCell in PCell (RRC Connection Reconfiguration on Cell1 (including Configuration of Cell2 ( Secondary cell: SCell))
- step S4 the UE transmits a completion notification to the eNB in response to the completion of the setting of the second cell, that is, the preparation for using the second cell is completed. (RRC Connection Reconfiguration Complete).
- step S5 the eNB transmits a use start notification of the second cell to the UE (Cell2 Activation).
- step S6 the UE receives downlink data by using the first and second cells simultaneously (DL data on Cell1 and Cell2).
- UE in step S6 should just be able to use the 1st and 2nd cell simultaneously for downlink data reception. In other words, the UE need not always receive downlink data in both the first and second cells. Whether one or both of the first and second cells are used for downlink data reception is determined based on, for example, the downlink data amount or the service used by the UE.
- the UE transmits uplink data in the second cell it can be basically realized by the same procedure as shown in FIG.
- the UE that performs CA has at least a part of the functions of Physical layer and MAC (Medium Access Control) layer for each cell to be integrated, but the configuration beyond RLC (Radio Link Control) layer is the same as when CA is not performed It is. Therefore, the core network (EvolvedvolvePacket Core: EPC) is not aware of whether or not the UE is CA.
- EPC EvolvedvolvePacket Core
- Inter-eNB ⁇ ⁇ ⁇ ⁇ ⁇ CA that integrates multiple cells operated by different eNBs in a heterogeneous network (HetNet) environment.
- HetNet heterogeneous network
- a macro cell operated by a macro base station
- a pico cell operated by a pico base station
- Pico eNB PeNB
- Non-Patent Document 3 a method has been proposed in which a macro cell having a wide coverage is used for transmission / reception of a control system signal such as UE mobility management, and a pico cell having relatively good communication quality is used for transmission / reception of a data system signal such as user data.
- 3GPP TS 36.331 V11.0.0 "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification", Section 5.3.5, July 2012
- 3GPP TSG RAN Works on Rel-12 and Onwards Ljubljana, Slovenia, 11-12 June 2012
- 3GPP RWS-120010, NTT DOCOMO "Requirements, Candidate Solutions & Technology Roadmap for LTE Rel-12 Onward”
- CA carrier aggregation
- UE radio terminal
- eNB radio station
- the UE can set a plurality of cells.
- the UE is a cell for performing communication so that the plurality of cells operated by different eNBs can be used simultaneously.
- Configuration eg RRC Connection Setup or RRC Connection Reconfiguration or both
- the UE when the UE establishes a wireless connection in one eNB cell, the wireless connection cannot be established in another eNB cell.
- one of the objects of the present invention is to enable a single wireless terminal to establish wireless connection in a plurality of wireless station cells in order to realize carrier aggregation of multiple cells operated by different wireless stations.
- a wireless communication system, a wireless station, a wireless terminal, a communication control method, and a program are provided.
- the wireless communication system includes a first wireless station that operates the first cell and a second wireless station that operates the second cell.
- the first radio station prepares for communication with the radio terminal in the second cell while a first radio connection with the radio terminal in the first cell is established.
- the second radio station is configured to request or instruct the second radio station.
- the first radio station establishes a second radio connection between the second radio station and the radio terminal in the second cell while maintaining the first radio connection. It is configured to instruct a terminal or the second wireless station.
- the first wireless station that operates the first cell includes a communication control unit that controls communication with a wireless terminal in which a first wireless connection is established in the first cell.
- the communication control unit is configured to prepare for communication with the wireless terminal in the second cell while a first wireless connection with the wireless terminal in the first cell is established.
- the second radio station is configured to request or instruct.
- the communication control unit is configured to establish a second wireless connection between the second wireless station and the wireless terminal in the second cell while maintaining the first wireless connection. It is configured to instruct the second radio station.
- the second radio station that operates the second cell includes a communication control unit that controls communication with the radio terminal.
- the communication control unit responds to an instruction or request from the first radio station while a first radio connection with the radio terminal is established in a first cell operated by the first radio station. In response, it is configured to prepare for communication with the wireless terminal in the second cell. Furthermore, the communication control unit responds to an instruction from the first radio station, and the second radio station and the radio in the second cell while the first radio connection is maintained. It is configured to establish a second wireless connection with the terminal.
- the wireless terminal includes a wireless communication unit and a control unit.
- the control unit performs the first communication with the first radio station.
- the second cell is set while maintaining one wireless connection.
- the communication control method in the first radio station operating the first cell is: (A) While the first wireless connection between the first wireless station and the wireless terminal in the first cell is established, the second cell operated by the second wireless station Requesting or instructing the second radio station to prepare for communication with a radio terminal; and (b) a first with the radio terminal in the second cell while maintaining the first radio connection. Instructing the wireless terminal or the second wireless station to establish two wireless connections; including.
- the communication control method in the second radio station operating the second cell is: (A) In response to an instruction or request from the first wireless station while the first wireless connection with the wireless terminal is established in the first cell operated by the first wireless station, Preparing for communication with the wireless terminal in the second cell, and (b) in response to an instruction from the first wireless station, while maintaining the first wireless connection, Establishing a second wireless connection between the second wireless station and the wireless terminal in a second cell; including.
- a communication control method in a wireless terminal is responsive to an instruction from the first wireless station or the second wireless station according to the first, second, or third aspect described above, Setting the second cell while maintaining a first wireless connection with the first wireless station.
- the program includes a group of instructions for causing a computer to perform the communication control method in the first wireless station according to the fifth aspect described above.
- the program includes a group of instructions for causing a computer to perform the communication control method in the second wireless station according to the sixth aspect described above.
- the program includes a group of instructions for causing a computer to perform the communication control method in the wireless terminal according to the seventh aspect described above.
- a wireless terminal, a communication control method, and a program can be provided.
- FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment.
- the wireless communication system according to the present embodiment includes a first wireless station 1, a second wireless station 2, and a wireless terminal 3.
- the radio stations 1 and 2 operate the first cell 10 and the second cell 20, respectively.
- the radio stations 1 and 2 are, for example, radio base stations or base station control stations.
- the radio terminal 3 is configured to be able to establish a second radio connection in the second cell 20 while maintaining the first radio connection in the first cell 10.
- wireless terminal 3 can use a some cell (for example, cell 10 and 20) simultaneously for transmission or reception of a signal (for example, user data or control information).
- the wireless terminal 3 supports carrier aggregation of a plurality of cells operated by different wireless stations.
- FIG. 1 shows a HetNet environment. Specifically, the first cell 10 shown in FIG. 1 has a wider coverage than the second cell 20.
- FIG. 1 shows a hierarchical cell configuration in which the second cell 20 is arranged in the first cell 10.
- the cell configuration shown in FIG. 1 is only an example.
- the first and second cells 10 and 20 may have similar coverage.
- the wireless communication system according to the present embodiment may be applied to a homogeneous network environment.
- the radio communication system of the present embodiment is connected to the radio terminal 3.
- a wireless connection needs to be established in each of cell 10 and cell 20.
- the wireless communication system of the present embodiment operates as follows. That is, the wireless station 1 establishes a first wireless connection with the wireless terminal 3 in the cell 10 so that the cells 10 and 20 can be used simultaneously in the wireless terminal 3 for receiving or transmitting signals. In the meantime, it is configured to request or instruct the radio station 2 to prepare for communication with the radio terminal 3 in the cell 20.
- the wireless station 1 is configured to instruct the wireless terminal 3 or the wireless station 2 to establish a second wireless connection with the wireless terminal 3 in the cell 20 while maintaining the first wireless connection. .
- the wireless terminal 3 can establish wireless connection in the plurality of cells 10 and 20.
- the above-mentioned “using a plurality of cells simultaneously” is not limited to actually receiving or transmitting a signal simultaneously in a plurality of cells, but may include receiving or transmitting a signal in both of a plurality of cells. Although it is in a possible state, it actually receives or transmits signals in any cell, receives or transmits different types of signals in each of multiple cells, or receives signals in each of multiple cells. Or use for either transmission or the like.
- the wireless station 1 instructs the wireless terminal 3 to establish a second wireless connection in the cell 20. Then, the wireless terminal 3 sets the cell 20 in response to an instruction from the wireless station 1. Thereby, the wireless terminal 3 can establish the second wireless connection with the wireless station 2 in the cell 20.
- the radio station 1 instructs the radio terminal 3 via a control connection between the radio station 1 and the radio terminal 3 in the cell 10 (for example, a control channel or a signaling radio bearer (SRB)). Just send it. Accordingly, the wireless terminal 3 prepares for communication using the cell 20 of the wireless station 2 while communicating with the wireless station 1 (that is, transmitting and / or receiving a signal carrying user data). It can be done easily.
- the wireless station 1 instructs the wireless station 2 to establish a second wireless connection in the cell 20.
- the wireless station 2 instructs the wireless terminal 3 to establish the second wireless connection in the cell 20.
- the wireless terminal 3 sets the cell 20 in response to an instruction from the wireless station 1.
- the wireless terminal 3 can establish the second wireless connection with the wireless station 2 in the cell 20.
- the instruction to establish the second wireless connection from the wireless station 1 to the wireless station 2 may be transmitted at the same time as the instruction (or request) for communication preparation with the wireless terminal 3 in the cell 20, or the communication It may also be used as a preparation instruction (or request).
- the message for requesting (or requesting) communication preparation with the wireless terminal 3 in the cell 20 explicitly or implicitly indicates the instruction for establishing the second wireless connection from the wireless station 1 to the wireless station 2.
- the wireless station 2 prepares for communication with the wireless terminal 3 in response to receiving a communication preparation instruction (or request) with the wireless terminal 3, and establishes the second wireless connection to the wireless terminal. 3 may be instructed.
- An instruction from the radio station 2 to the radio terminal 3 can be sent from the radio station 2 to the radio terminal 3 via a control connection (for example, a control channel or a signaling radio bearer) between the radio station 1 and the radio terminal 3 in the cell 20. That's fine.
- the wireless station 1 transmits wireless resource setting information necessary for reception in the cell 20 through the control connection in the cell 10. 3 may be notified.
- establishing a wireless connection means, for example, that a wireless terminal and a wireless station can communicate with each other, or the wireless terminal and the wireless station share information necessary for communication. It corresponds to becoming a state.
- setting a cell in a wireless terminal corresponds to, for example, a state where a cell can be used in a wireless terminal or a state where preparation for using a cell is completed in a wireless terminal.
- preparing for communication with a wireless terminal at a wireless station means, for example, a state in which information necessary for wireless connection with the wireless terminal is held, and wireless communication with the wireless terminal. This corresponds to generating information necessary for connection, allowing wireless connection with the wireless terminal, or accepting communication with the wireless terminal.
- the wireless terminal related to establishment of the first wireless connection or establishment of the second wireless connection from the wireless station 1 to the wireless station 2 or from the wireless station 2 to the wireless station 1 3 terminal individual information may be sent.
- wireless connection related to establishment of the first wireless connection or establishment of the second wireless connection from the wireless station 2 to the wireless station 1 or from the wireless station 1 to the wireless station 2 At least one of setting information and wireless access information may be sent.
- the terminal individual information of the wireless terminal 3 related to establishment of the first wireless connection or establishment of the second wireless connection may include at least one of the information elements listed below.
- ⁇ Wireless terminal capability information ⁇ Wireless terminal identifier information ⁇ Selected network information ⁇ Bearer information ⁇ Radio resource control information ⁇ Wireless terminal movement history information ⁇ Service information
- the wireless connection setting information related to the establishment of the first wireless connection or the establishment of the second wireless connection may include at least one of the information elements listed below. -Serving cell information-System information-Radio resource setting information-Measurement setting information-Mobility control information-Security setting information
- the radio access information related to the establishment of the first radio connection or the establishment of the second radio connection may include at least one of the information elements listed below.
- Radio access identifier information ⁇ Radio access resource information
- the first radio station 1 is a radio station that operates (manages) a cell with relatively large coverage
- the second radio station 2 has a cell with small coverage.
- LPN Low Power Node
- the LPN for example, a wireless station having the same function as the wireless station 1 or a new type of network node (New (Node) having a smaller function than the wireless station 1 can be considered.
- the second cell may be a new type of cell (New Cell Type) different from the conventional type having a new type of carrier (New Carrier Type) different from the conventional one as a constituent element.
- FIG. 2 is a block diagram illustrating a configuration example of the first radio station 1.
- the wireless communication unit 11 receives an uplink signal (uplink signal) transmitted from the wireless terminal 3 via an antenna.
- the reception data processing unit 13 restores the received uplink signal.
- the obtained received data is transferred via the communication unit 14 to another network node, for example, a data relay device or a mobility management device of an upper network, or another wireless station.
- the uplink user data received from the wireless terminal 3 is transferred to the data relay device of the upper network.
- control data of the non-access layer (Non-Access Stratum (NAS)) among the control data received from the wireless terminal 3 is transferred to the mobility management device of the upper network. Further, the reception data processing unit 13 receives control data to be transmitted to the radio station 2 from the communication control unit 15 and transmits it to the radio station 2 via the communication unit 14.
- NAS Non-Access Stratum
- the transmission data processing unit 12 acquires user data addressed to the wireless terminal 3 from the communication unit 14, and performs error correction coding, rate matching, interleaving, and the like to generate a transport channel. Further, the transmission data processing unit 12 adds control information to the data sequence of the transport channel to generate a transmission symbol sequence.
- the radio communication unit 11 performs each process such as carrier wave modulation, frequency conversion, and signal amplification based on the transmission symbol sequence to generate a downlink signal, and transmits this to the radio terminal 3. Further, the transmission data processing unit 12 receives control data transmitted to the wireless terminal 3 from the communication control unit 15 and transmits it to the wireless terminal 3 via the wireless communication unit 11.
- the communication control unit 15 signals the wireless station 2 and the wireless terminal 3 so that the cells 10 and 20 can be used simultaneously in the wireless terminal 3 for receiving or transmitting user data. That is, the communication control unit 15 transmits a message requesting or instructing preparation for communication with the wireless terminal 3 in the cell 20 to the wireless station 2 via the communication unit 14. In addition, a message instructing establishment of the second wireless connection in the cell 20 is transmitted to the wireless terminal 3 or the wireless station 2 via the wireless communication unit 11 or the communication unit 14. In the case of the procedure example 1 described above, the communication control unit 15 transmits the wireless connection setting information regarding the cell 20 of the wireless station 2 to the wireless terminal 3. The wireless connection setting information may be transmitted in the same message as the wireless connection establishment instruction, or may be transmitted in a separate message. In the case of the procedure example 2 described above, the communication control unit 15 may transmit the radio resource setting information regarding the cell 20 of the radio station 2 to the radio terminal 3.
- FIG. 3 is a block diagram illustrating a configuration example of the second radio station 2.
- the functions and operations of the wireless communication unit 21, the transmission data processing unit 22, the reception data processing unit 23, and the communication unit 24 shown in FIG. 3 correspond to the corresponding elements of the wireless station 1 shown in FIG. The same as the unit 11, the transmission data processing unit 12, the reception data processing unit 13, and the communication unit 14.
- the communication control unit 25 of the radio station 2 receives a message requesting or instructing preparation for communication with the radio terminal 3 in the cell 20 from the radio station 1, and sets the radio communication unit 21 based on the message. Preparation for communication with the wireless terminal 3 in the cell 20 is performed. In the case of the procedure example 2 described above, the communication control unit 25 transmits the wireless connection setting information regarding the cell 20 of the wireless station 2 to the wireless terminal 3.
- the wireless connection setting information may be transmitted in the same message as the wireless connection establishment instruction, or may be transmitted in a separate message.
- FIG. 4 is a block diagram illustrating a configuration example of the wireless terminal 3.
- the wireless communication unit 31 supports carrier aggregation of a plurality of cells operated by different wireless stations, and can simultaneously use a plurality of cells (for example, the cells 10 and 20) for signal transmission or reception.
- the radio communication unit 31 receives a downlink signal from the radio station 1 or the radio station 2 or both via an antenna.
- the reception data processing unit 32 restores the reception data from the received downlink signal and sends it to the data control unit 33.
- the data control unit 33 uses the received data according to the purpose.
- the transmission data processing unit 34 and the wireless communication unit 31 generate an uplink signal using the transmission data supplied from the data control unit 33 and transmit the uplink signal to the wireless station 1 or the wireless station 2 or both.
- the communication control unit 35 of the wireless terminal 3 sets the cell 20 in response to an instruction from the wireless station 1 or the wireless station 2 so that the cells 10 and 20 can be simultaneously used in the wireless communication unit 31.
- the wireless terminal 3 can communicate with the wireless station 2 while communicating with the wireless station 1 (that is, transmitting and / or receiving a signal carrying user data).
- FIG. 5 is a flowchart showing the operation of the wireless station 1 in Procedure Example 1.
- the wireless station 1 (communication control unit 15) performs communication (that is, transmission or reception of a signal carrying user data or the like, or both) in the cell 20 by the wireless terminal 3 belonging to the own cell 10. Is requested or instructed to the wireless station 2.
- the wireless station 1 determines whether an acknowledgment from the wireless station 2 with respect to the request or instruction in step S101 has been received. As already described, in Procedure Example 1, the wireless station 1 directly instructs the wireless terminal 3 to establish the second wireless connection in the cell 20.
- step S102 when an affirmative response is received (YES in step S102), the wireless station 1 transmits an instruction to establish a second wireless connection to the wireless terminal 3 (step S103). On the other hand, when an affirmative response is not obtained (NO in step S102), the wireless station 1 ends the process of FIG. 5 without instructing the establishment of the second wireless connection.
- FIG. 6 is a flowchart showing the operation of the radio station 2 in Procedure Example 1.
- the wireless station 2 receives from the wireless station 1 a message that instructs or requests preparation for communication with the wireless terminal 3 belonging to the cell 10 in the cell 20.
- the wireless station 2 determines whether to permit an instruction or request from the wireless station 1. For example, the radio station 2 may reject the instruction or request from the radio station 1 when sufficient radio resources for communication with the radio terminal 3 cannot be secured because the load of the cell 20 is high.
- the radio station 2 transmits a negative response to the radio station 1 when rejecting the instruction or request from the radio station 1 (step S203), and transmits an affirmative response to the radio station 1 when permitting (step S204).
- the wireless station 2 prepares for communication with the wireless terminal 3 in the cell 20.
- FIG. 7 is a flowchart showing the operation of the wireless terminal 3 in Procedure Example 1.
- the wireless terminal 3 (communication control unit 35) receives an instruction for establishing a second wireless connection from the first wireless station 1.
- the wireless terminal 3 sets the cell 20 in response to the instruction in step S301, and establishes the second wireless connection with the wireless station 2 in the cell 20.
- the wireless terminal 3 reports the establishment completion of the second wireless connection in the cell 20 to the wireless station 1.
- FIG. 8 is a sequence diagram showing the entire procedure example 1.
- the first radio station 1 and the radio terminal 3 establish a first radio connection in the first cell 10.
- the wireless station 1 communicates with the wireless terminal 3 in the cell 10.
- the wireless station 1 transmits downlink data addressed to the wireless terminal 3 in the cell 10.
- Steps S 403 to S 406 are procedures for establishing a second wireless connection in the cell 20 for the wireless terminal 3 communicating in the cell 10. That is, in step S403, the wireless station 1 requests or instructs the wireless station 2 to prepare for communication with the wireless terminal 3 in the cell 20. In step S404, the wireless station 2 transmits a response to the request or instruction in step S403 to the wireless station 1. The response is an affirmative response or a negative response. When transmitting an affirmative response in step S ⁇ b> 404, the wireless station 2 prepares for communication in the cell 20 with the wireless terminal 3 based on a request or instruction from the wireless station 1.
- step S ⁇ b> 405 the radio station 1 transmits an instruction to establish the second radio connection in the cell 20 to the radio terminal 3 in the cell 10 in response to receiving the affirmative response.
- step S406 the wireless terminal 3 sets the cell 20 based on an instruction from the wireless station 1. As a result, a wireless connection between the wireless station 2 and the wireless terminal 3 is established in the cell 20.
- the wireless terminal 3 can use the cells 10 and 20 simultaneously by completing step S406. Therefore, in step S407, for example, the wireless terminal 3 receives downlink data in both the cells 10 and 20.
- the wireless terminal 3 in step S407 only needs to be able to use the cells 10 and 20 at the same time for communication (reception or transmission of a signal carrying user data or the like, or both).
- the radio terminal 3 does not always need to receive downlink data in both the first and second cells, and does not always need to transmit uplink data.
- Whether to use one or both of the cells 10 and 20 for receiving or transmitting user data or both is determined based on, for example, the amount of user data or the service used by the wireless terminal 3.
- the wireless station 1 may make a request for communication preparation.
- the wireless station 2 is a wireless station having a part (only) of a function for communicating with the wireless terminal 3, for example, in step S403, the wireless station 1 performs a communication preparation instruction.
- “request” and “instruction” are distinguished as follows. “Request” is used when the side receiving the request determines whether to accept the request. The “instruction” is used when the side receiving the instruction accepts the instruction.
- a wireless station having a part (only) of a function for communicating with the wireless terminal 3 is, for example, a wireless station that communicates only user data between the wireless terminal 3 and a higher-level network, or A wireless station that communicates only control signals between the wireless terminal 3 and the host network is conceivable.
- a radio station having a part (only) of a function for communicating with the wireless terminal 3 it has a function of communicating with the wireless terminal 3, but a function of communicating with an upper network.
- the first wireless station 1 may transmit the following information when performing the request or the instruction. These pieces of information may be transmitted together with the request or the instruction (that is, in the same message), or may be transmitted in another message.
- Wireless connection setting information For example, serving cell information;
- Terminal individual information For example, wireless terminal capability information, wireless terminal identifier information, selected network identifier information, bearer information, wireless resource control information, wireless terminal movement history information, or service information, or any combination thereof;
- Wireless access information For example, wireless access identifier information.
- the wireless station 2 may transmit the following information in step S404 in FIG. These pieces of information may be transmitted together with the request or the response to the instruction (that is, in the same message) or may be transmitted in another message.
- Wireless connection setting information For example, system information, wireless resource setting information, measurement setting information, movement control information, security setting information, or any combination thereof;
- Radio access information For example, radio access identifier information, radio access resource information, or a combination thereof.
- FIG. 9 is a flowchart showing the operation of the wireless station 1 in the procedure example 2.
- the processes in steps S101 and S102 of FIG. 9 are the same as steps S101 and S102 of the procedure example 1 shown in FIG.
- the radio station 1 instructs the radio station 2 to establish the second radio connection in the cell 20.
- the instruction for establishing the second wireless connection from the wireless station 1 to the wireless station 2 may also be used as the communication preparation instruction (or request) in step S101.
- the procedure of FIG. 9 shows a case where the instruction for establishing the second wireless connection is also used as the instruction for communication preparation in step S101.
- the communication preparation instruction (or request) message in step S101 explicitly or implicitly indicates the second wireless connection establishment instruction.
- the wireless station 1 does not need to transmit an independent message indicating the instruction to establish the second wireless connection to the wireless station 2.
- the wireless station 1 (communication control unit 15) instructs the wireless terminal 3 to receive information on the second cell 20 in the first cell 10.
- the wireless station 1 determines reception of the completion notification of establishment of the second wireless connection from the wireless station 2, and ends the procedure of FIG. 9 on condition that the completion notification is received.
- FIG. 10 is a flowchart showing the operation of the wireless station 2 in the procedure example 2.
- the processes in steps S201 to S204 in FIG. 10 are the same as steps S201 to S204 in the procedure example 2 shown in FIG.
- the wireless station 2 (communication control unit 25) instructs the wireless terminal 3 to establish the second wireless connection in the cell 20.
- the wireless station 2 transmits a completion notification to the wireless station 1 in response to completion of establishment of the second wireless connection (steps S606 and S607).
- FIG. 11 is a flowchart showing the operation of the wireless terminal 3 in the procedure example 2.
- the wireless terminal 3 (communication control unit 35) receives an instruction to receive information on the second cell 20 from the first wireless station 1 in the first cell 10.
- the radio terminal 3 performs a reception operation in the second cell 20 based on an instruction from the radio station 1.
- the wireless terminal 3 receives an instruction to establish a second wireless connection from the second wireless station 2.
- the wireless terminal 3 sets the cell 20 in response to the instruction in step S701, and establishes the second wireless connection with the wireless station 2 in the cell 20.
- the wireless terminal 3 reports the completion of establishment of the second wireless connection in the cell 20 to the wireless station 2.
- FIG. 12 is a sequence diagram showing the entire procedure example 2.
- the processes in steps S401 to S404 in FIG. 12 are the same as steps S401 to S404 in the procedure example 1 shown in FIG.
- the wireless station 1 instructs the wireless terminal 3 to receive the information of the second cell 20 in the first cell 10.
- the instruction in step S805 includes the radio resource setting information of the second cell 20 that is necessary for the radio terminal 2 to perform the reception operation in the second cell 20. Further, in step S805, the radio station 1 may notify information (for example, a gap pattern) that defines a gap period for the radio terminal 3 to perform a reception operation in the cell 20.
- the radio terminal 3 may set the gap period voluntarily in response to receiving the radio resource setting information of the second cell 20 from the radio station 1.
- the gap period is a period in which transmission in the first cell 10 to the radio terminal 3 is stopped for reception of information in the second cell 20, or the radio terminal 3 is in the first cell. It means a period when it is not necessary to receive a signal to itself.
- step S806 the wireless station 1 instructs the wireless station 2 to establish a second wireless connection with the wireless terminal 3 in the cell 20.
- the instruction in step S806 may not be explicitly performed.
- step S807 the radio station 2 instructs the radio terminal 3 to establish the second radio connection in the cell 20.
- step S808 the wireless terminal 3 sets the cell 20 based on the instruction from the wireless station 2. As a result, a wireless connection between the wireless station 2 and the wireless terminal 3 is established in the cell 20.
- step S809 the wireless station 2 notifies the wireless station 1 of the completion of establishment of the second wireless connection.
- the wireless terminal 3 can use the cells 10 and 20 simultaneously. Therefore, in step S810, for example, the wireless terminal 3 receives downlink data in both the cells 10 and 20.
- a configuration example of the wireless communication system according to the present embodiment may be the same as that in FIG.
- the radio stations 1 and 2 correspond to eNB
- the radio terminal 3 corresponds to UE.
- X2 that is a direct interface
- S1 that is an interface via a core network
- newly defined Interface for example, X3
- the radio terminal (UE) 3 supports carrier aggregation (Inter-eNB CA) of a plurality of cells operated by different radio stations (eNB).
- Inter-eNB CA here is not limited to receiving or transmitting signals simultaneously in different eNB cells, but in both eNB cells (for example, user data or control). (Information) can be received or transmitted, but in reality, signals are received or transmitted in any eNB cell, and different types of signals are received or transmitted in different eNB cells. Or using different eNB cells for either signal reception or transmission.
- radio station 1 and 2 are demonstrated as eNB1 and 2, and the radio
- the procedure for establishing the wireless connection between each of the cells 10 and 20 and the UE 3 may be the same as that in the first embodiment. That is, eNB1 requests or instructs eNB2 to prepare communication with UE3 in cell 20 while the first wireless connection with UE3 in cell 10 is established. Furthermore, eNB1 instruct
- the control system signal (Control Plane (CP) signal) may be transmitted from the eNB1
- the user data system signal (User Plane (UP) signal) may be transmitted from the eNB2.
- Procedure example 3 corresponds to procedure example 1 of the first embodiment.
- the eNB 1 instructs the UE 3 to establish the second wireless connection in the cell 20.
- the eNB 1 may notify the UE 3 of the radio connection setting information (RRC Connection Reconfiguration information) related to the radio connection in the cell 20.
- UE3 sets the cell 20 in response to the instruction
- RRC Connection Reconfiguration information radio connection setting information
- Procedure example 4 corresponds to procedure example 1 of the second embodiment.
- the eNB 1 instructs the eNB 2 to establish the second wireless connection in the cell 20.
- eNB 2 instructs UE 3 to establish the second wireless connection in cell 20.
- the eNB 2 may notify the UE 3 of wireless connection setting information (RRC Connection Reconfiguration information) related to the wireless connection in the cell 20.
- UE3 sets the cell 20 in response to the instruction
- RRC Connection Reconfiguration information wireless connection setting information
- UE3 terminal-specific information (UE Context information) related to establishment of the second wireless connection is transmitted from eNB1 to eNB2 or from eNB2 to eNB1. May be.
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE3 terminal-specific information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- UE Context information UE Context information
- RRC ⁇ Connection Reconfiguration information
- Radio Access information radio access information
- the terminal individual information may include at least one of information elements listed below.
- -UE capability information For example, UE radio access capability, UE network capability, UE security capability, or any combination thereof;
- Wireless terminal identifier information (UE identification information): for example, C-RNTI, (S-) TMSI, or shortMAC-I, or any combination thereof;
- UE selected network information for example, GUMMEI (Globally Unique MME Identifier), eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or any combination thereof; Bearer information: For example, E-RAB ID, E-RAB Level QoS Parameters, or UL GTP Tunnel Endpoint ID, or any combination thereof;
- Radio resource control information (RRC context information): AS-Config, AS-Context, ue-ConfigRelease, or ue-RadioAccessCapabilityInfo, or any combination thereof;
- Wireless terminal movement history information (UE history information): For example, Last Visited Cell Information; Service information
- the radio connection setting information may include at least one of the information elements listed below.
- Serving cell information for example, Physical Cell ID (PCI), or EUTRAN Cell Global ID (ECGI), or a combination thereof;
- Radio resource configuration information for example, PhysicalConfigDedicated, Mac-Mainconfig, RLC-Config, PDCP-Config, logicalChannelIdentity, drb-Identity, or eps-BearerIdentity, or any combination thereof;
- Measurement configuration information For example, MeasObject or ReportConfig, or a combination thereof;
- Mobility control information For example, targetPhysCellId, carrierFreq, or newUE-Identity, or any combination thereof;
- Security configuration information SecurityAlgorithmConfig, for example.
- Radio access information may include at least one of the information elements listed below.
- Radio access identification information For example, RACH preamble index
- Radio access resource information For example, PRACH resource configuration.
- eNB1 is a macro radio base station (Macro eNB: MeNB) that operates (manages) a macrocell with relatively large coverage, and eNB2 operates a cell with small coverage ( It is conceivable that it is a low power radio station (Low Power Node: LPN) to be managed), but is not limited to this.
- LPN Low Power Node
- a pico radio base station (Pico eNB: PeNB) having the same function as the MeNB or a new type of network node (New Node) having a smaller function than the MeNB can be considered.
- the second cell (cell 20) may be a new type of cell (New Cell Type) different from the conventional type including a new type of carrier (New Carrier Type) different from the conventional one.
- FIG. 13 is a sequence diagram illustrating the entire procedure example 3
- FIG. 14 is a sequence diagram illustrating the entire procedure example 4. 13 and 14, the first cell 10 is displayed as CELL1, and the second cell 20 is displayed as CELL2.
- step S901 eNB1 and UE3 establish a 1st radio
- step S902 eNB1 communicates with UE3 in the cell 10.
- the eNB 1 transmits downlink data addressed to the UE 3 in the cell 10.
- step S903 or eNB1 performs the detection or determination (secondary cell discovery or decision) of the cell 20.
- FIG. 1 eNB1 and UE3 establish a 1st radio
- eNB1 communicates with UE3 in the cell 10.
- the eNB 1 transmits downlink data addressed to the UE 3 in the cell 10.
- step S903 or eNB1 performs the detection or determination (secondary cell discovery or decision) of the cell 20.
- step S904 the eNB 1 prepares for the UE 3 belonging to its own cell (serving cell) 10 to perform communication (that is, transmission and / or reception of a signal carrying user data or the like) in the cell 20 Is requested or instructed to the eNB 2 that operates (Secondary Cell Preparation Request (or instruction)).
- step S905 eNB2 transmits a response to the request or instruction in step S904 to eNB1 (Secondary Cell Preparation Request (or instruction) response).
- the eNB 2 prepares for communication in the cell 20 with the UE 3 based on a request or instruction from the eNB 1.
- step S906 in response to receiving the acknowledgment, the eNB 1 transmits an instruction to establish the second wireless connection in the cell 20 to the UE 3 in the cell 10 (RRC Connection Reconfiguration).
- the instruction includes the wireless connection setting information (Secondary Cell configuration) of the second cell 20.
- step S907 UE3 sets the cell 20 based on the said instruction
- step S908 the eNB 1 transmits a message indicating activation of the cell 20 (that is, start of use) to the UE 3 in the first cell 10 in order to start carrier aggregation (Secondary Cell Activation).
- step S909 eNB1 notifies eNB1 that the setting of the cell 20, ie, the secondary cell for a carrier aggregation, was completed (Secondary
- the UE 3 can perform carrier aggregation in the cells 10 and 20. Therefore, in step S910, for example, UE3 receives downlink data in both cells 10 and 20.
- step S1006 the eNB 1 instructs the UE 3 to receive information on the second cell 20 in the own cell (serving cell) 10 (Radio Resource Configuration of Second Cell).
- step S1007 the eNB1 instructs the eNB2 to establish the second radio connection with the UE3 in the cell 20 (Secondary Cell Preparation Complete).
- step S1008 eNB2 instruct
- step S1009 UE3 sets the cell 20 based on the instruction
- eNB2 notifies eNB1 of completion of establishment of the second wireless connection (Secondary (Cell Configuration Complete).
- UE3 can perform carrier aggregation in cells 10 and 20. Therefore, in step S1011, for example, UE3 receives downlink data in both cells 10 and 20.
- EPS RB Evolved Packet System
- the bearer for user data transfer between the radio stations (eNB) 1 and 2 and the upper network is an S1 bearer.
- the S1 bearer is set between the data relay device (that is, Serving GW: S-GW) and the eNB in the upper network.
- a bearer set between two data relay apparatuses in the EPC, that is, an S-GW and a P-GW (Packet Data Network Gateway) is an S5 / S8 bearer.
- the EPS RB and S1 bearer are collectively called a radio access bearer (E-UTRAN Radio Access Bearer: E-RAB).
- E-RAB is a bearer for transferring user data between UE and EPC via eNB. Furthermore, the bearer between the P-GW and the UE including the E-RAB and the S5 / S8 bearer is called an EPS bearer.
- the EPS bearer is set for each UE.
- one UE can use a plurality of EPS bearers.
- a plurality of EPS bearers related to one UEPS are distinguished by, for example, a QoS class of user data to be transferred.
- the settings of EPS bearer, E-RAB, and S1 bearer are controlled by a mobility management device (Mobility Management Entity: MME) in the upper network.
- MME mobility management device
- the MME communicates with the S-GW and the eNB
- the MME, the S-GW, and the eNB are mutually bearer contexts (for example, the IP address of the S-GW, the IP address of the eNB, the S-GW, and the eNB S1 bearer is set by sharing the endpoint identifier of
- FIG. 15 is a block diagram illustrating a configuration example of the wireless communication system according to the present embodiment.
- the EPC 4 that is a specific example of the host network includes an MME 5 and an S / P-GW 6.
- Each of eNB1 and 2 connects MME5 and a control connection (S1-MME), and sets up the bearer (S1 bearer) for user data transfer between S / P-GW6.
- Step 1101 an EPS bearer for transferring user data between UE 3 and EPC 4 via cell 10 is set by signaling of UE 3, eNB 1, MME 5, and S / P-GW 6.
- step S1102 the cell 20 is set as a secondary cell in order for the UE 3 to perform carrier aggregation of the cells 10 and 20 according to the procedure described in the second embodiment.
- step S1103 the eNB 2 requests the MME 5 to set a bearer (S1 bearer, E-RAB, or EPS bearer) for transferring user data between the UE 3 and the EPC 4 via the cell 20.
- a bearer setting procedure is implemented by signaling of UE3, eNB2, MME5, and S / P-GW6.
- eNB2 sets S1 bearer (or E-RAB) according to the said bearer setting procedure.
- steps S1104 and S1106 the S / P-GW 6 transfers the downlink user data to the UE 3 to the first S1 bearer associated with the eNB1 or the second S1 bearer associated with the eNB2.
- step S1105 and S1107 eNB1 and 2 transmit the downlink user data received through the S1 bearer to UE3.
- eNBs 1 and 2 which of eNBs 1 and 2 is used for downlink user data transmission may be determined according to, for example, the type of service and the necessary QoS (or QCI). Further, a control system signal (Control Plane (CP) signal) may be transmitted from the eNB1, and a user data system signal (User Plane (UP) signal) may be transmitted from the eNB2.
- CP Control Plane
- UP User Plane
- the selection network information or bearer information of the UE 3 from the eNB 1 to the eNB 2 at the time of the request (or instruction) of the UE 3 communication preparation in the cell 20 An example of transmitting at least one of them was shown.
- Specific examples of the selected network information are GUMMEI, eNB UE S1AP ID, MME UE S1AP ID, or CSG ID, or any combination thereof.
- Specific examples of the bearer information are E-RAB ID, E-RAB Level QoS Parameters, UL GTP Tunnel Endpoint ID, or any combination thereof.
- eNB2 can trigger bearer setting for transferring user data of UE3 via cell 20 in this embodiment. It is. That is, eNB2 should just generate
- the UE 3 uses the uplink physical control channel (physical uplink control channel: PUCCH) in the secondary cell (cell 20) to control information of Layer 1 or Layer 2 or both of them ( L1 / L2 control information) may be transmitted. Specifically, the UE 3 responds to downlink reception in the secondary cell (cell 20) (for example, H-ARQ (Hybrid Automatic Repeat Request) ACK, CQI (Channel Quality Indicator) / PMI (Precoding Matrix Indicator), or RI.
- the PUCCH of the secondary cell (cell 20) may be used for the reply of (Rank Indicator).
- eNB1 uses, for example, a random access preamble identifier (RA) preamble ID) and a mask value (RA PRACH Mask) used in a physical random access channel (Physical Random Access Channel: PRACH). May be sent to. Thereby, the access delay in the uplink of the second cell can be reduced.
- RA random access preamble identifier
- RA PRACH Mask mask value used in a physical random access channel
- the radio link terminal identifier may be the same in the primary cell (cell 10) and the secondary cell (cell 20).
- Time Alignment (TA) Timer for determining the synchronization of uplink signals is set as the primary cell (cell 10) and the secondary cell (cell). 20) may be held for each. Furthermore, when there are a plurality of secondary cells, one TA timer may be held for the plurality of secondary cells, and the synchronization may be determined. Therefore, the primary cell and the secondary cell (or secondary cell group) may belong to different timing groups (Timing Advance Group: TAG).
- TAG Timing Advance Group
- the eNB 2 may transmit MIB (Master Information Block) / SIB (System Information Block) information and security context to the eNB 1.
- MIB Master Information Block
- SIB System Information Block
- the secondary cell (cell 20) added for carrier aggregation is used only for the downlink component carrier (Component (Carrier: CC) or only for the uplink component carrier (CC). You may make it do.
- Component Carrier: CC
- CC uplink component carrier
- the primary cell (cell 10) and the secondary cell (cell 20) may be in different duplex modes.
- the primary cell (cell 10) may be FDD (Frequency Division Duplex) and the secondary cell (cell 20) may be TDD (Time Division Duplex).
- the diagrams illustrated in the first to third embodiments show a heterogeneous network (HetNet) environment.
- HetNet heterogeneous network
- these embodiments can also be applied to a homogenous network.
- Homogeneous Network a cellular network composed of macro (or micro) cells of a macro (or micro) base station can be considered.
- the communication control method by the wireless station 1 (communication control unit 15), the wireless station 2 (communication control unit 25), and the wireless terminal 3 (communication control unit 35) described in the first to third embodiments is not limited. Alternatively, it may be realized using a semiconductor processing apparatus including Application Specific Integrated Circuit (ASIC). In addition, these processes may be realized by causing a computer system including at least one processor (e.g., microprocessor, Micro Processing Unit (MPU), Digital Signal Processor (DSP)) to execute a program. Specifically, one or a plurality of programs including a group of instructions for causing a computer system to execute the algorithm shown in the flowchart and the sequence diagram may be created and the programs may be supplied to the computer.
- processor e.g., microprocessor, Micro Processing Unit (MPU), Digital Signal Processor (DSP)
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
- LTE Long Term Evolution
- 3GPP UMTS Universal Mobile Telecommunications System
- 3GPP2 CDMA2000 system (1xRTT 3GPP2 CDMA2000 system (1xRTT
- HRPD High Rate Packet Data
- GSM Global System for Mobile Communications
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Abstract
Description
(a)前記第1のセルでの前記第1の無線局と無線端末との第1の無線接続が確立されている間に、第2の無線局により運用される第2のセルでの前記無線端末との通信の準備をするよう前記第2の無線局に要求又は指示すること、及び
(b)前記第1の無線接続を維持したまま前記第2のセルでの前記無線端末との第2の無線接続を確立するよう前記無線端末又は前記第2の無線局に指示すること、
を含む。
(a)第1の無線局により運用される第1のセルで無線端末との第1の無線接続が確立されている間に、前記第1の無線局からの指示又は要求に応答して、前記第2のセルでの前記無線端末との通信の準備をすること、及び
(b)前記第1の無線局からの指示に応答して、前記第1の無線接続が維持されたまま、前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立すること、
を含む。
図1は、本実施形態に係る無線通信システムの構成例を示している。本実施形態に係る無線通信システムは、第1の無線局1、第2の無線局2、及び無線端末3を含む。無線局1及び2は、第1のセル10及び第2のセル20をそれぞれ運用する。無線局1及び2は、例えば、無線基地局、又は基地局制御局である。無線端末3は、第1のセル10における第1の無線接続を維持したまま、第2のセル20における第2の無線接続を確立することができるよう構成されている。これにより、無線端末3は、信号(例えば、ユーザーデータ又は制御情報)の送信又は受信のために複数のセル(例えば、セル10及び20)を同時に使用することができる。言い換えると、無線端末3は、異なる無線局によって運用される複数のセルのキャリアアグリゲーションをサポートする。
・無線端末能力情報
・無線端末識別子情報
・選択ネットワーク情報
・ベアラ情報
・無線リソース制御情報
・無線端末移動履歴情報
・サービス情報
・サービングセル情報
・システム情報
・無線リソース設定情報
・測定設定情報
・移動制御情報
・セキュリティ設定情報
・無線アクセス識別子情報
・無線アクセスリソース情報
図5は、手順例1における無線局1の動作を示すフローチャートである。ステップS101では、無線局1(通信制御部15)は、自セル10に帰属する無線端末3がセル20において通信(つまり、ユーザーデータなどを乗せた信号の送信若しくは受信又はこれら両方)を行うための準備を無線局2に要求又は指示する。ステップS102では、無線局1は、ステップS101での要求又は指示に対する無線局2からの肯定応答を受信したかを判定する。既に述べたように、手順例1では、セル20での第2の無線接続の確立を無線局1が直接的に無線端末3に指示する。したがって、肯定応答を受信した場合(ステップS102でYES)、無線局1は、第2の無線接続の確立の指示を無線端末3に送信する(ステップS103)。一方、肯定応答が得られない場合(ステップS102でNO)、無線局1は、第2の無線接続の確立を指示することなく、図5の処理を終了する。
・無線接続設定情報:例えば、サービングセル情報;
・端末個別情報:例えば、無線端末能力情報、無線端末識別子情報、選択ネットワーク識別子情報、ベアラ情報、無線リソース制御情報、無線端末移動履歴情報、若しくはサービス情報、又はこれらの任意の組み合わせ;
・無線アクセス情報:例えば、無線アクセス識別子情報。
・無線接続設定情報:例えば、システム情報、無線リソース設定情報、測定設定情報、移動制御情報、若しくはセキュリティ設定情報、又はこれらの任意の組み合わせ;
・無線アクセス情報:例えば、無線アクセス識別子情報、若しくは無線アクセスリソース情報、又はこれらの組み合わせ。
図9は、手順例2における無線局1の動作を示すフローチャートである。図9のステップS101及びS102における処理は、図5に示した手順例1のステップS101及びS102と同様である。既に述べたように、手順例2では、無線局1は、セル20での第2の無線接続の確立を無線局2に指示する。また、無線局1から無線局2への第2の無線接続の確立の指示は、ステップS101における通信準備の指示(又は要求)と兼用されてもよい。図9の手順は、第2の無線接続の確立の指示がステップS101における通信準備の指示と兼用される場合を示している。つまり、ステップS101における通信準備の指示(又は要求)のメッセージは、第2の無線接続の確立の指示を明示的又は暗示的に示す。したがって、図9の例では、無線局1は、第2の無線接続の確立の指示を示す独立したメッセージを無線局2に送信しなくてもよい。ステップS503では、無線局1(通信制御部15)は、第1のセル10において、第2のセル20の情報の受信を無線端末3に指示する。ステップS504では、無線局1は、無線局2からの第2の無線接続の確立の完了通知の受信を判定し、完了通知の受信を条件として図9の手順を終了する。
本実施形態では、上述した第1の実施形態を3GPP LTEシステムに適用する例について説明する。本実施形態に係る無線通信システムの構成例は、図1と同様とすればよい。ただし、無線局1及び2はeNBに相当し、無線端末3はUEに相当する。また、無線局間(つまり、eNB間)の情報の送受信は、直接インターフェースであるX2を用いても良いし、コアネットワークを経由するインターフェースであるS1を用いても良いし、或いは、新たに規定されるインターフェース(例えば、X3)でも良い。無線端末(UE)3は、異なる無線局(eNB)によって運用される複数のセルのキャリアアグリゲーション(Inter-eNB CA)をサポートする。尚、ここでの「Inter-eNB CA」とは、実際に異なるeNBのセルで信号を同時に受信又は送信することに限定はされず、異なるeNBのセルの両方において信号(例えば、ユーザーデータ又は制御情報)を受信又は送信することが可能な状態になっているが実際にはいずれかのeNBのセルで信号を受信又は送信すること、異なるeNBのセルそれぞれで種類の異なる信号を受信又は送信すること、或いは、異なるeNBのセルそれぞれを信号の受信又は送信のいずれかに使用すること、などを含む。以下では、無線局1及び2をeNB1及び2、無線端末3をUE3として説明する。
・無線端末能力情報(UE capability information):例えば、 UE radio access capability、 UE network capability、若しくはUE security capability、又はこれらの任意の組み合わせ;
・無線端末識別子情報(UE identification information):例えば、C-RNTI、 (S-)TMSI、若しくは shortMAC-I、又はこれらの任意の組み合わせ;
・選択ネットワーク情報(UE selected network information):例えば、GUMMEI (Globally Unique MME Identifier)、eNB UE S1AP ID、MME UE S1AP ID、若しくはCSG ID、又はこれらの任意の組み合わせ;
・ベアラ情報(Bearer information):例えば、E-RAB ID、E-RAB Level QoS Parameters、若しくはUL GTP Tunnel Endpoint ID、又はこれらの任意の組み合わせ;
・無線リソース制御情報(RRC context information): AS-Config、AS-Context、 ue-ConfigRelease、若しくはue-RadioAccessCapabilityInfo、又はこれらの任意の組み合わせ;
・無線端末移動履歴情報(UE history information):例えば、Last Visited Cell Information;
・サービス情報(Service information):例えば、QCI、 QoS、若しくはMBMS information)、又はこれらの任意の組み合わせ。
・サービングセル情報(Serving Cell information):例えば、Physical Cell ID (PCI)、 若しくはEUTRAN Cell Global ID(ECGI)、又はこれらの組み合わせ;
・システム情報(System information):例えば、MIB (Master Information Block)、若しくはSIB (System Information Block) x (x=1,2,..)、又はこれらの組み合わせ;
・無線リソース設定情報(Radio resource configuration information):例えば、PhysicalConfigDedicated、Mac-Mainconfig、RLC-Config、PDCP-Config、logicalChannelIdentity、drb-Identity、若しくはeps-BearerIdentity、又はこれらの任意の組み合わせ;
・測定設定情報(Measurement configuration information):例えば、MeasObject、若しくはReportConfig、又はこれらの組み合わせ;
・移動制御情報(Mobility control information):例えば、targetPhysCellId、carrierFreq、若しくはnewUE-Identity、又はこれらの任意の組み合わせ;
・セキュリティ設定情報(Security configuration information):例えば、SecurityAlgorithmConfig。
・無線アクセス識別子情報(Radio access identification information):例えば、RACH preamble index;
・無線アクセスリソース情報(Radio access resource information):例えば、PRACH resource configuration。
ステップS901では、eNB1及びUE3は、セル10において第1の無線接続を確立する(RRC Connection Establishment)。ステップS902では、eNB1はUE3とセル10において通信する。図13の例では、eNB1は、UE3宛ての下りデータをセル10において送信する。ステップS903では、UE3又はeNB1は、セル20の検出又は判定(secondary cell discovery or decision)を行う。ステップS904では、eNB1は、自セル(serving cell)10に帰属するUE3がセル20において通信(つまり、ユーザーデータなどを乗せた信号の送信若しくは受信又はこれら両方)を行うための準備を、セル20を運用するeNB2に要求又は指示する(Secondary Cell Preparation Request (or instruction))。ステップS905では、eNB2は、ステップS904の要求又は指示に対する応答をeNB1に送信する(Secondary Cell Preparation Request (or instruction) response)。ステップS905にて肯定応答(Acknowledgement)を送信する場合、eNB2は、eNB1からの要求又は指示に基づいて、UE3とのセル20での通信の準備を行う。
図14のステップS901~S905における処理は、図13のステップS901~S905と同様である。ステップS1006では、eNB1は、自セル(serving cell)10において、第2のセル20の情報の受信をUE3に指示する(Radio Resource Configuration of Second Cell)。ステップS1007では、eNB1は、セル20でのUE3との第2の無線接続の確立をeNB2に指示する(Secondary Cell Preparation Complete)。ステップS1008では、eNB2は、セル20において、第2の無線接続の確立をUE3に指示する(RRC connection Reconfiguration)。
本実施形態では、上述した第2の実施形態の変形について説明する。本実施形態では、無線局1及び2と上位ネットワークの間のベアラ、及び上位ネットワーク内のベアラの設定について説明する。これらのベアラは、ユーザーデータの転送のために、第2の実施形態で説明した手順によって設定されるセル10及び20での第1及び第2の無線接続(つまり、データ無線ベアラ(Evolved Packet System Radio bearer:EPS RB))と対応付けられる。
上述した第2及び第3の実施形態では、UE3は、セカンダリセル(セル20)において上り物理制御チャネル(physical uplink control channel:PUCCH)を用いてLayer 1若しくは Layer 2 又はこれらの両方の制御情報(L1/L2制御情報)を送信してもよい。具体的には、UE3は、セカンダリセル(セル20)での下り受信に対する応答(例えば、H-ARQ(Hybrid Automatic Repeat Request)ACK、CQI (Channel Quality Indicator)/PMI(Precoding Matrix Indicator)、又はRI(Rank Indicator))の返信に、セカンダリセル(セル20)のPUCCHを使用してもよい。
2 第2の無線局
3 無線端末
10 第1のセル
20 第2のセル
15 通信制御部
25 通信制御部
35 通信制御部
Claims (45)
- 第1のセルを運用する第1の無線局と、
第2のセルを運用する第2の無線局と、
を備え、
前記第1の無線局は、
前記第1のセルでの無線端末との第1の無線接続が確立されている間に、前記第2のセルでの前記無線端末との通信の準備をするよう前記第2の無線局に要求又は指示し、
前記第1の無線接続を維持したまま前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立するよう前記無線端末又は前記第2の無線局に指示するよう構成されている、
無線通信システム。 - 前記第1の無線局は、前記第2の無線接続を確立するよう前記無線端末に指示し、
前記無線端末は、前記第2のセルを設定する、
請求項1に記載の無線通信システム。 - 前記第1の無線局は、前記第2の無線接続を確立するよう前記第2の無線局に指示し、
前記第2の無線局は、前記第2の無線接続を確立するよう前記無線端末に指示し、
前記無線端末は、前記第2のセルを設定する、
請求項1に記載の無線通信システム。 - 前記第1の無線局は、前記第1又は第2の無線接続の確立に関連する前記無線端末の端末個別情報を前記第2の無線局に通知する、請求項1~3のいずれか1項に記載の無線通信システム。
- 前記第2の無線局は、前記端末個別情報に基づいて、上位ネットワークと前記第2の無線局の間で前記無線端末のユーザーデータを転送するためのベアラの設定をトリガーする、請求項4に記載の無線通信システム。
- 前記第1の無線局は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第2の無線局に通知する、請求項1~5のいずれか1項に記載の無線通信システム。
- 前記第2の無線局は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第1の無線局に通知する、請求項1~6のいずれか1項に記載の無線通信システム。
- 前記第1のセルはプライマリセルであり、
前記第2のセルはセカンダリセルであり、
前記無線端末は、前記第2のセルにおいて上り物理制御チャネルを用いてLayer 1制御情報及びLayer 2制御情報の少なくとも一方を送信する、
請求項1~7のいずれか1項に記載の無線通信システム。 - 前記端末個別情報は、(a)無線端末能力情報、(b)無線端末識別子情報、(c)選択ネットワーク情報、(d)ベアラ情報、(e)無線リソース制御情報、(f)無線端末移動履歴情報、及び(g)サービス情報のうち少なくとも1つを含む、請求項4又は5に記載の無線通信システム。
- 前記無線接続設定情報は、(a)サービングセル情報、(b)システム情報、(c)無線リソース設定情報、(c)測定設定情報、(d)移動制御情報、及び(f)セキュリティ設定情報のうち少なくとも1つを含む、請求項6又は7に記載の無線通信システム。
- 前記無線アクセス情報は、(a)無線アクセス識別子情報、及び(b)無線アクセスリソース情報のうち少なくとも1つを含む、請求項6又は7に記載の無線通信システム。
- 前記第1の無線局は、前記第1及び第2のセルを信号の受信又は送信のために前記無線端末において同時に利用できるようにするために、前記第2の無線接続を前記第2の無線局に指示する、請求項1~11のいずれか1項に記載の無線通信システム。
- 第1のセルを運用する第1の無線局であって、
前記第1のセルにおいて第1の無線接続が確立されている無線端末との通信を制御する通信制御手段を備え、
前記通信制御手段は、
前記第1のセルでの前記無線端末との第1の無線接続が確立されている間に、第2のセルでの前記無線端末との通信の準備をするよう前記第2のセルを運用する第2の無線局に要求又は指示し、
前記第1の無線接続を維持したまま前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立するよう前記無線端末又は前記第2の無線局に指示するよう構成されている、
第1の無線局。 - 前記通信制御手段は、前記第2の無線接続を確立するよう前記無線端末に指示する、請求項13に記載の第1の無線局。
- 前記通信制御手段は、前記第2の無線接続を確立するよう前記第2の無線局に指示する、請求項13に記載の第1の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する前記無線端末の端末個別情報を前記第2の無線局に通知する、請求項13~15のいずれか1項に記載の第1の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第2の無線局に通知する、請求項13~16のいずれか1項に記載の第1の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第2の無線局から受信する、請求項13~17のいずれか1項に記載の第1の無線局。
- 前記第1のセルはプライマリセルであり、
前記第2のセルはセカンダリセルであり、
前記無線端末は、前記第2のセルにおいて上り物理制御チャネルを用いてLayer 1制御情報及びLayer 2制御情報の少なくとも一方を送信する、
請求項13~18のいずれか1項に記載の第1の無線局。 - 前記端末個別情報は、(a)無線端末能力情報、(b)無線端末識別子情報、(c)選択ネットワーク情報、(d)ベアラ情報、(e)無線リソース制御情報、(f)無線端末移動履歴情報、及び(g)サービス情報のうち少なくとも1つを含む、請求項16に記載の第1の無線局。
- 前記無線接続設定情報は、(a)サービングセル情報、(b)システム情報、(c)無線リソース設定情報、(c)測定設定情報、(d)移動制御情報、及び(f)セキュリティ設定情報のうち少なくとも1つを含む、請求項17又は18に記載の第1の無線局。
- 前記無線アクセス情報は、(a)無線アクセス識別子情報、及び(b)無線アクセスリソース情報のうち少なくとも1つを含む、請求項17又は18に記載の第1の無線局。
- 前記通信制御手段は、前記第1及び第2のセルを信号の受信又は送信のために前記無線端末において同時に利用できるようにするために、前記第2の無線接続を前記第2の無線局に指示する、請求項13~22のいずれか1項に記載の第1の無線局。
- 第2のセルを運用する第2の無線局であって、
無線端末との通信を制御する通信制御手段を備え、
前記通信制御手段は、
第1の無線局により運用される第1のセルで前記無線端末との第1の無線接続が確立されている間に、前記第1の無線局からの指示又は要求に応答して、前記第2のセルでの前記無線端末との通信の準備をし、
前記第1の無線局からの指示に応答して、前記第1の無線接続が維持されたまま、前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立するよう構成されている、
第2の無線局。 - 前記通信制御手段は、前記第2の無線接続を確立するよう前記無線端末に指示する、請求項24に記載の第2の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する前記無線端末の端末個別情報を前記第1の無線局から受信する、請求項24又は25に記載の第2の無線局。
- 前記通信制御手段は、前記端末個別情報に基づいて、上位ネットワークと前記第2の無線局の間で前記無線端末のユーザーデータを転送するためのベアラの設定をトリガーする、請求項26に記載の第2の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第1の無線局から受信する、請求項24~27のいずれか1項に記載の第2の無線局。
- 前記通信制御手段は、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第1の無線局に通知する、請求項24~28のいずれか1項に記載の第2の無線局。
- 請求項1~12のいずれか1項に記載の無線通信システムと結合して使用される無線端末であって、
無線通信手段と、
前記第1の無線局又は前記第2の無線局からの指示に応答して、前記第1の無線局との第1の無線接続を維持したまま前記第2のセルを設定する制御手段と、
を備える、無線端末。 - 前記第1のセルはプライマリセルであり、
前記第2のセルはセカンダリセルであり、
前記無線通信手段は、前記第2のセルにおいて上り物理制御チャネルを用いてLayer 1制御情報及びLayer 2制御情報の少なくとも一方を送信する、
請求項30に記載の無線端末。 - 第1のセルを運用する第1の無線局における通信制御方法であって、
前記第1のセルでの前記第1の無線局と無線端末との第1の無線接続が確立されている間に、第2の無線局により運用される第2のセルでの前記無線端末との通信の準備をするよう前記第2の無線局に要求又は指示すること、及び
前記第1の無線接続を維持したまま前記第2のセルでの前記無線端末との第2の無線接続を確立するよう前記無線端末又は前記第2の無線局に指示すること、
を備える通信制御方法。 - 前記第2の無線接続を確立するよう指示することは、前記第2の無線接続を確立するよう前記無線端末に指示することを含む、請求項32に記載の通信制御方法。
- 前記第2の無線接続を確立するよう指示することは、前記第2の無線接続を確立するよう前記第2の無線局に指示することを含む、請求項32に記載の通信制御方法。
- 前記無線端末との通信の準備をするよう要求又は指示することは、前記第1又は第2の無線接続の確立に関連する前記無線端末の端末個別情報を前記第2の無線局に通知することを含む、請求項32~34のいずれか1項に記載の通信制御方法。
- 前記無線端末との通信の準備をするよう要求又は指示することは、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第2の無線局に通知することを含む、請求項32~35のいずれか1項に記載の通信制御方法。
- 前記無線端末との通信の準備をするよう要求又は指示することは、前記第1又は第2の無線接続の確立に関連する無線接続設定情報、及び前記第1又は第2の無線接続に関連する無線アクセス情報のうち少なくとも1つを前記第2の無線局から受信することを含む、請求項32~36のいずれか1項に記載の通信制御方法。
- 第2のセルを運用する第2の無線局における通信制御方法であって、
第1の無線局により運用される第1のセルで無線端末との第1の無線接続が確立されている間に、前記第1の無線局からの指示又は要求に応答して、前記第2のセルでの前記無線端末との通信の準備をすること、及び
前記第1の無線局からの指示に応答して、前記第1の無線接続が維持されたまま、前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立すること、
を備える通信制御方法。 - 前記確立することは、前記第2の無線接続を確立するよう前記無線端末に指示することを含む、請求項38に記載の通信制御方法。
- 前記準備をすることは、前記第1又は第2の無線接続の確立に関連する前記無線端末の端末個別情報を前記第1の無線局から受信することを含む、請求項38又は39に記載の通信制御方法。
- 前記端末個別情報に基づいて、上位ネットワークと前記第2の無線局の間で前記無線端末のユーザーデータを転送するためのベアラの設定をトリガーすることをさらに備える、請求項40に記載の通信制御方法。
- 請求項1~12のいずれか1項に記載の無線通信システムと結合して使用される無線端末における通信制御方法であって、
前記第1の無線局又は前記第2の無線局からの指示に応答して、前記第1の無線局との第1の無線接続を維持したまま前記第2のセルを設定することを備える、
通信制御方法。 - 第1のセルを運用する第1の無線局における通信制御方法をコンピュータに行わせるためのプログラムを格納した非一時的なコンピュータ可読媒体であって、
前記通信制御方法は、
前記第1のセルでの無線端末との第1の無線接続が確立されている間に、第2の無線局により運用される第2のセルでの前記無線端末との通信を準備するよう前記第2の無線局に要求又は指示すること、及び
前記第2のセルでの前記無線端末との第2の無線接続を確立するよう前記無線端末又は前記第2の無線局に指示すること、
を含む、コンピュータ可読媒体。 - 第2のセルを運用する第2の無線局における通信制御方法をコンピュータに行わせるためのプログラムを格納した非一時的なコンピュータ可読媒体であって、
前記通信制御方法は、
第1の無線局により運用される第1のセルで無線端末との第1の無線接続が確立されている間に、前記第1の無線局からの指示又は要求に応答して、前記第2のセルでの前記無線端末との通信の準備をすること、及び
前記第1の無線局からの指示に応答して、前記第1の無線接続が維持されたまま、前記第2のセルでの前記第2の無線局と前記無線端末との第2の無線接続を確立すること、
を含む、コンピュータ可読媒体。 - 請求項1~12のいずれか1項に記載の無線通信システムと結合して使用される無線端末における通信制御方法をコンピュータに行わせるためのプログラムを格納した非一時的なコンピュータ可読媒体であって、
前記通信制御方法は、前記第1の無線局又は前記第2の無線局からの指示に応答して、前記第1の無線局との第1の無線接続を維持したまま前記第2のセルを設定することを含む、
コンピュータ可読媒体。
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