WO2013137460A1 - 通信制御方法、ユーザ端末、基地局、及びホーム基地局 - Google Patents
通信制御方法、ユーザ端末、基地局、及びホーム基地局 Download PDFInfo
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- WO2013137460A1 WO2013137460A1 PCT/JP2013/057514 JP2013057514W WO2013137460A1 WO 2013137460 A1 WO2013137460 A1 WO 2013137460A1 JP 2013057514 W JP2013057514 W JP 2013057514W WO 2013137460 A1 WO2013137460 A1 WO 2013137460A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
- H04W12/062—Pre-authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
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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]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a communication control method, a user terminal, a base station, and a home base station in a mobile communication system.
- Non-Patent Document 1 In 3GPP (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, specifications for home base stations, which are small base stations installed in residences and companies, are formulated (see Non-Patent Document 1).
- the home base station forms a specific cell such as a CSG (Closed Subscriber Group) cell or a hybrid cell.
- the CSG cell is a cell that can be accessed only by user terminals having access rights (referred to as “CSG members”).
- a hybrid cell is a cell that can be accessed without being a CSG member, but is advantageously handled by a CSG member.
- cell is also used as a term indicating a function of performing wireless communication with a user terminal in addition to being used as a term indicating a minimum unit of a wireless communication area.
- the mobility management device included in the core network authenticates the user terminal (access control) for the access right to the specific cell.
- the mobility management device authenticates the user terminal during the handover procedure
- the handover procedure via the core network must be performed. For this reason, there are problems that the time required for the handover procedure becomes longer and the traffic of the core network increases.
- an object of the present invention is to provide a communication control method, a user terminal, a base station, and a home base station that can improve the efficiency of a handover procedure to a specific cell.
- the communication control method of the present invention includes a home base station that forms a specific cell, and a mobility management device that authenticates the user terminal for access rights to the specific cell in a handover procedure of the user terminal to the specific cell.
- a communication control method applied to a mobile communication system including a step A in which the user terminal updates a list of specific cells accessible by the user terminal, and an elapsed time since the list is updated within a predetermined time. Accordingly, the method includes a step B of omitting authentication of the user terminal by the mobility management device in the handover procedure.
- FIG. 1 is a configuration diagram of a mobile communication system.
- FIG. 2 is a configuration diagram of a radio frame used in the mobile communication system.
- FIG. 3 is a block diagram of the UE.
- FIG. 4 is a block diagram of the eNB.
- FIG. 5 is a block diagram of the MME.
- FIG. 6 is a block diagram of the HeNB.
- FIG. 7 is a block diagram of HeNB GW.
- FIG. 8 is a sequence diagram of an operation sequence 1 according to the first embodiment.
- FIG. 9 is a sequence diagram of an operation sequence 2 according to the first embodiment.
- FIG. 10 is a sequence diagram of an operation sequence 1 according to the second embodiment.
- FIG. 11 is a sequence diagram of an operation sequence 2 according to the second embodiment.
- a communication control method includes a home base station that forms a specific cell, a mobility management device that authenticates the user terminal with respect to an access right to the specific cell in a handover procedure of the user terminal to the specific cell, It is applied to a mobile communication system including
- the communication control method includes a step A in which the user terminal updates a list of specific cells that the user terminal can access (a so-called white list), and an elapsed time since the update of the list (hereinafter, “white list progress”).
- Step B) that omits authentication of the user terminal by the mobility management device in the handover procedure in response to the time being within a predetermined time (hereinafter referred to as “whitelist guarantee time”).
- whitelist guarantee time a predetermined time
- the whitelist elapsed time is within the whitelist guarantee time, it is considered that the whitelist is highly reliable, and the authentication of the user terminal by the mobility management apparatus is omitted in the process of the handover procedure.
- the handover procedure to a specific cell can be made efficient.
- the communication control method further includes a step C in which the user terminal transmits a measurement report related to the specific cell to a serving cell before the handover procedure.
- the user terminal transmits a measurement report related to the specific cell to a serving cell before the handover procedure.
- the user terminal The predetermined information related to the elapsed time or the update time of the list may be transmitted together with the measurement report.
- the predetermined information may indicate whether or not the elapsed time is within the predetermined time.
- the user terminal may update the list according to a list update message from the mobility management device, and the list update message may include information specifying the predetermined time. .
- the communication control method is the case where the base station forming the serving cell determines that the user terminal is to be handed over to the specific cell, and the elapsed time is based on the predetermined information. In the case where it is determined that the time is within the predetermined time, authentication of the user terminal by the mobility management device may be omitted and a step D of transmitting a handover request to the home base station may be further included.
- the communication control method is the case where the base station determines that the user terminal is to be handed over to the specific cell, and the elapsed time is set to the predetermined time based on the predetermined information. In the case where it is determined that the number exceeds that, it may further include a step E of requesting the mobility management device to authenticate the user terminal.
- the communication control method when the base station forming the serving cell determines to perform handover of the user terminal to the specific cell, the communication control method sends the predetermined information to the home base station together with a handover request. You may further have the step F which transmits.
- the home base station determines that the elapsed time is within the predetermined time based on the predetermined information
- the user terminal authentication by the mobility management device is omitted, and the handover
- the method may further include a step G of transmitting a response to the request to the base station.
- the home base station when the home base station determines that the elapsed time exceeds the predetermined time based on the predetermined information, the home base station requests authentication of the user terminal to the mobility management device H May further be included.
- the user terminal is a user terminal that performs handover from a serving cell to the specific cell in a mobile communication system including a mobility management apparatus that authenticates an access right to the specific cell in a handover procedure to the specific cell.
- a control unit that performs control to update a list of specific cells accessible by itself, and a transmission unit that transmits a measurement report related to the specific cell to the serving cell. Predetermined information regarding the elapsed time since the update or the update time of the list is transmitted together with the measurement report.
- the base station includes a mobility management device that performs authentication for the access right to the specific cell in a handover procedure to the specific cell, and a user terminal that updates a list of specific cells accessible by the base station.
- a base station that forms a serving cell of the user terminal, wherein the elapsed time since the list is updated is within a predetermined time, and the mobility management device performs the handover procedure in the handover procedure. It has a control part which performs control which omits authentication of a user terminal.
- the home base station includes a mobility management device that authenticates the access right to the specific cell in a handover procedure to the specific cell, and a user terminal that updates a list of specific cells accessible by the home base station.
- a mobility management device that authenticates the access right to the specific cell in a handover procedure to the specific cell
- a user terminal that updates a list of specific cells accessible by the home base station.
- the handover by the mobility management device in the handover procedure It has a control part which performs control which omits authentication of a user terminal.
- FIG. 1 is a configuration diagram of a mobile communication system according to the present embodiment.
- a mobile communication system includes a user terminal (UE) 100, a base station (eNB: evolved Node-B) 200, a mobility management device (MME: Mobility Management Entity) 300, a home station (UE).
- MME Mobility Management Entity
- UE user terminal
- HeNB Home evolved Node-B
- HeNB GW Home evolved Node-B Gateway
- Each of the eNB 200, the HeNB 400, and the HeNB GW 500 is a network device included in a radio access network (E-UTRAN: Evolved-UMTS Terrestrial Radio Access Network) 10.
- the MME 300 is a network device included in a core network (EPC: Evolved Packet Core) 20.
- the UE 100 is a mobile radio communication device owned by a user.
- the UE 100 performs radio communication with a cell (referred to as a “serving cell”) that has established a connection in a connection state corresponding to a state during communication.
- a serving cell a cell that has established a connection in a connection state corresponding to a state during communication.
- the handover procedure includes a preparation stage (Preparation), an execution stage (Execution), and a completion stage (Completion).
- the UE 100 that uses the cell of the eNB 200 as a serving cell is moving toward the cell of the HeNB 400, and performs handover from the cell of the eNB 200 to the cell of the HeNB 400.
- the cell of the eNB 200 is a “source cell”
- the cell of the HeNB 400 is a “target cell”.
- the eNB 200 is a macro base station (MeNB), a pico base station (PeNB), or a home base station (HeNB). In the present embodiment, the description will be given assuming an example in which the eNB 200 is a MeNB.
- the eNB 200 forms one or a plurality of cells.
- the eNB 200 performs radio communication with the UE 100.
- the eNB 200 has a handover decision right for the UE 100 under its cell. Specifically, the eNB 200 can determine whether or not to perform the handover of the UE 100 to the CSG cell based on the measurement report (Measurement Report) from the UE 100.
- the measurement report Measurement Report
- ENB200 communicates with EPC20 on the S1 interface which is a logical communication path between EPC20.
- the eNB 200 communicates with the MME 300 over an S1-MME interface that is a kind of S1 interface.
- the eNB 200 can perform inter-base station communication with the adjacent HeNB 400 on the X2 interface that is a logical communication path with the adjacent HeNB 400.
- the MME 300 is provided corresponding to a control plane that handles control information, and performs various types of mobility management and authentication processing for the UE 100.
- the MME 300 performs authentication of the UE 100 (hereinafter referred to as “CSG authentication”) for the access right to the CSG cell / hybrid cell.
- the general handover procedure to the CSG cell uses the S1 interface.
- the MME 300 performs CSG authentication of the UE 100, and in detail confirms whether the UE 100 is a member UE of the CSG cell.
- the UE 100 can be handed over to the CSG cell.
- the handover of the UE 100 to the CSG cell is rejected.
- the HeNB 400 is a small fixed wireless communication device that can be installed indoors.
- the HeNB 400 forms a specific cell with a narrower coverage than the cell.
- the specific cell is referred to as a “CSG cell”, a “hybrid cell”, or an “open cell” depending on the set access mode.
- the CSG cell is a cell that can be accessed only by the UE 100 having the access right (referred to as “member UE”), and broadcasts the CSG ID.
- the UE 100 maintains a list (white list) of CSG IDs of CSG cells to which the UE 100 has access rights, and determines whether there is access rights based on the white list and the CSG ID broadcast by the CSG cell. To do.
- the hybrid cell is a cell in which the member UE is handled more favorably than the non-member UE, and broadcasts information indicating that the cell is a cell released to the non-member UE in addition to the CSG ID.
- the UE 100 determines whether or not there is an access right based on the white list and the CSG ID broadcast by the hybrid cell.
- the UE 100 confirms the presence or absence of the access right based on the white list
- the white list managed by the UE 100 and the CSG subscriber information (CSG Subscription Data) managed by the MME 300 are always synchronized. Not necessarily. For this reason, basically, CSG authentication of the UE 100 by the MME 300 is required in the handover procedure of the UE 100 to the CSG cell or the hybrid cell.
- An open cell is a cell that is handled equally by the UE 100 regardless of whether it is a member, and does not broadcast a CSG ID. From the viewpoint of UE 100, an open cell is equivalent to a cell.
- the description will be given assuming an example in which the cell (specific cell) of the HeNB 400 is a CSG cell.
- the cell (specific cell) of HeNB 400 may be a hybrid cell.
- the HeNB 400 communicates with the MME 300 via the HeNB-GW 500 on the S1 interface (S1-MME interface). However, when the S1 interface that does not pass through the HeNB GW 500 is established with the MME 300, the HeNB 400 can directly communicate with the MME 300 without passing through the HeNB GW 500.
- the HeNB 400 is connected to the eNB 200 via the X2 interface.
- X2 connection the connection using the X2 interface.
- the HeNB GW 500 manages a set of the plurality of HeNBs 400 between the EPC 20 (MME 300) and the plurality of HeNBs 400. From the viewpoint of the MME 300, the HeNB GW 500 is equivalent to the HeNB 400. On the other hand, from the viewpoint of the HeNB 400, the HeNB GW 500 is equivalent to the MME 300.
- the HeNB-to-GW 500 reduces traffic to be transmitted to and received from the MME 300 by performing communication with the MME 300 on behalf of the plurality of HeNBs 400. Further, the HeNB GW 500 can also relay data from one HeNB 400 under the management of the HeNB to the other HeNB 400.
- FIG. 2 is a configuration diagram of a radio frame used in the mobile communication system (LTE system) according to the present embodiment.
- the LTE system employs OFDMA (Orthogonal Frequency Division Multiplexing Access) for the downlink, and SC-FDMA (Single Carrier Division Multiple Access) for the uplink.
- OFDMA Orthogonal Frequency Division Multiplexing Access
- SC-FDMA Single Carrier Division Multiple Access
- the radio frame is composed of ten subframes arranged in the time direction, and each subframe is composed of two slots arranged in the time direction.
- the length of each subframe is 1 ms, and the length of each slot is 0.5 ms.
- Each subframe includes a plurality of resource blocks (RB) in the frequency direction and includes a plurality of symbols in the time direction.
- a guard interval called a cyclic prefix (CP) is provided at the head of each symbol.
- the section of the first few symbols of each subframe is a control region mainly used as a physical downlink control channel (PDCCH).
- the remaining section of each subframe is a data area mainly used as a physical downlink shared channel (PDSCH).
- both ends in the frequency direction in each subframe are control regions mainly used as a physical uplink control channel (PUCCH). Further, the central portion in the frequency direction in each subframe is a data region mainly used as a physical uplink shared channel (PUSCH).
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- FIG. 3 is a block diagram of the UE 100. As illustrated in FIG. 3, the UE 100 includes a radio transmission / reception unit 110, a storage unit 120, and a control unit 130.
- the wireless transceiver 110 transmits and receives wireless signals.
- the storage unit 120 stores various information used for control by the control unit 130.
- the control unit 130 controls various functions of the UE 100.
- the control unit 130 controls the wireless transmission / reception unit 110 to perform wireless communication with the serving cell in the connected state.
- the storage unit 120 stores a white list.
- the white list is updated by the control unit 130.
- the control unit 130 updates the white list according to the white list update message from the MME 300.
- the control unit 130 manages the elapsed time (whitelist elapsed time) since the whitelist was updated. For example, the control unit 130 records the time (update time) every time the white list is updated. Alternatively, the control unit 130 activates a timer for measuring the elapsed time of the white list when updating the white list.
- the storage unit 120 stores the whitelist guarantee time.
- the white list guarantee time may be a fixed length time stored in advance in the storage unit 120.
- the control unit 130 uses the whitelist guarantee time included in the whitelist update message to store the whitelist guarantee time stored in the storage unit 120. May be updated.
- the whitelist guarantee time can be determined as follows.
- One type of CSG member is a temporary CSG member (Temporary Member). If the period that can be set as such a temporary CSG member (hereinafter referred to as “member period”) is within the range of 2.4 hours to 3 days, for example, the shortest member period is 2.4 hours. Can be used as the whitelist guarantee time.
- the control unit 130 determines to transmit the measurement report, the control unit 130 compares the managed whitelist elapsed time with the whitelist guarantee time stored in the storage unit 120. Then, the control unit 130 generates whitelist update information (Whitelist Update Info.) Indicating whether or not the whitelist elapsed time is within the whitelist guarantee time.
- whitelist update information (Whitelist Update Info.) Indicating whether or not the whitelist elapsed time is within the whitelist guarantee time.
- the storage unit 120 stores location information (fingerprint information) related to the location of the CSG cell to which the storage unit 120 has access rights.
- the control unit 130 When the control unit 130 is in the connected state in the cell of the eNB 200, the control unit 130 enters the vicinity of the CSG cell to which the control unit 130 has the access right based on the position information (fingerprint information) regarding the position of the CSG cell to which the control unit 130 has the access right. When this is detected, the radio transmission / reception unit 110 is controlled to transmit a proximity notification to the eNB 200.
- the control unit 130 receives a measurement report including a physical identifier (PCI: Physical Cell Identifier) of the CSG cell.
- PCI Physical Cell Identifier
- the control unit 130 acquires broadcast information of the CSG cell.
- the radio transceiver 110 is controlled to transmit a measurement report based on the broadcast information to the eNB 200.
- the measurement report includes a CSG cell identifier (CGI: Cell Global Identifier), a tracking area identifier (TAI: Tracking Area Identifier), a CSG ID, and status information (Membership status) indicating whether or not the member is a CSG member. .
- the control unit 130 transmits white list update information together with the measurement report.
- the white list update information may be a message separate from the measurement report, or may be a message common to the measurement report.
- 1-bit whitelist update information is included in the measurement report. For example, “1” is set as the whitelist update information if the whitelist elapsed time is within the whitelist guarantee time, and “0” is set otherwise.
- the control unit 130 starts a process of establishing a connection (RRC connection) with the CSG cell.
- FIG. 4 is a block diagram of the eNB 200. As illustrated in FIG. 4, the eNB 200 includes a radio transmission / reception unit 210, a network communication unit 220, a storage unit 230, and a control unit 240.
- the wireless transmission / reception unit 210 transmits / receives a wireless signal.
- the wireless transmission / reception unit 210 forms one or a plurality of cells.
- the network communication unit 220 communicates with the MME 300 over the S1 interface.
- the network communication unit 220 performs inter-base station communication with the HeNB 400 on the X2 interface.
- the storage unit 230 stores various information used for control by the control unit 240.
- the control unit 240 controls various functions of the eNB 200.
- the control unit 240 transmits the measurement control information (Measurement Configuration) for instructing measurement to the CSG cell to the UE 100. 210 is controlled.
- the control unit 240 reports information (SI: System) of the CSG cell.
- the radio transmission / reception unit 210 is controlled to transmit request information (SI request) for requesting acquisition of Information to the UE 100.
- the control unit 240 performs handover of the UE 100 to the CSG cell based on the measurement report. Judge whether or not.
- the measurement report includes whitelist update information.
- the control unit 240 determines whether to omit the CSG authentication of the UE 100 by the MME 300 according to the white list update information included in the measurement report. Specifically, when the whitelist update information confirms that the whitelist elapsed time is within the whitelist guarantee time, the control unit 240 determines to omit the CSG authentication. On the other hand, when the whitelist update information confirms that the whitelist elapsed time exceeds the whitelist guarantee time, the control unit 240 determines to perform the CSG authentication.
- the whitelist is considered to be synchronized with the CSG subscriber information (CSG Subscription Data) managed by the MME 300 immediately after the update, so the whitelist elapsed time is within the whitelist guarantee time. If so, the CSG authentication of the UE 100 by the MME 300 is omitted.
- CSG Subscriber Information CSG Subscription Data
- control unit 240 determines to perform the handover of the UE 100 to the CSG cell and determines to omit the CSG authentication of the UE 100 by the MME 300 based on the whitelist update information
- the control unit 240 performs the CSG authentication of the UE 100 by the MME 300.
- the network communication unit 220 is controlled to transmit a handover request (HO Request) to the HeNB 400 on the X2 interface.
- control unit 240 determines that the UE 100 is to be handed over to the CSG cell and determines that the MME 300 performs CSG authentication of the UE 100 based on the whitelist update information, the control unit 240 requests the CSG authentication of the UE 100.
- the network communication unit 310 is controlled to transmit (CSG verification request) to the MME 300 over the S1 interface.
- the CSG authentication request includes the CSG ID of the CSG cell and the identification information of the UE 100.
- the control unit 240 controls the network communication unit 220 to transmit a handover request (HO Request) to the HeNB 400 over the X2 interface. To do.
- the control unit 240 stops the handover of the UE 100 to the CSG cell.
- control unit 240 transmits a handover instruction (HO Command) to the CSG cell to the UE 100. Controls the radio transceiver 210.
- FIG. 5 is a block diagram of the MME 300. As illustrated in FIG. 5, the MME 300 includes a network communication unit 310, a storage unit 320, and a control unit 330.
- the network communication unit 310 communicates with the eNB 200 and the HeNB GW 500 on the S1 interface.
- the storage unit 320 stores various types of information used for control by the control unit 330.
- the storage unit 320 stores CSG subscriber information (CSG Subscription Data) related to the access right of the UE 100.
- the CSG subscriber information is obtained by associating the identifier of the UE 100 with the CSG ID of each CSG cell to which the UE 100 has access rights.
- the control unit 330 controls various functions of the MME 300.
- the control unit 330 controls the network communication unit 310 to transmit a whitelist update message for updating the whitelist of the UE100 to the corresponding UE100. Good.
- the control unit 330 may include information specifying the whitelist guarantee time in the whitelist update message.
- the whitelist guarantee time when updating the whitelist for the temporary CSG member (Temporary Member) described above, the whitelist guarantee time having a length corresponding to the member period can be set.
- the control unit 330 When the network communication unit 310 receives the CSG authentication request (CSG verification request) of the UE 100 from the eNB 200, the control unit 330 is stored in the storage unit 320 and the CSG ID and the identification information of the UE 100 included in the CSG authentication request. Based on the CSG subscriber information, CSG authentication of the UE 100 is performed.
- the control unit 330 determines that the CSG authentication is successful and sends a response (CSG verification Ack) indicating the CSG authentication success.
- the network communication unit 310 is controlled to transmit to the eNB 200 on the S1 interface.
- the control unit 330 determines that the CSG authentication has failed and a response indicating the CSG authentication failure (CSG verification Nack ) Is transmitted to the eNB 200 over the S1 interface.
- FIG. 6 is a block diagram of HeNB 400. As illustrated in FIG. 6, the HeNB 400 includes a radio transmission / reception unit 410, a network communication unit 420, a storage unit 430, and a control unit 440.
- the wireless transmission / reception unit 410 transmits / receives a wireless signal.
- the wireless transmission / reception unit 410 forms a CSG cell.
- the CSG cell (wireless transmission / reception unit 410) transmits broadcast information on a BCCH (Broadcast Control Channel).
- the notification information includes CGI, TAI, and CSG ID.
- the network communication unit 420 communicates with the MME 300 via the HeNB-GW 500 on the S1 interface.
- the network communication unit 420 performs inter-base station communication with the eNB 200 on the X2 interface.
- the storage unit 430 stores various information used for control by the control unit 440.
- the control unit 440 controls various functions of the HeNB 400.
- the control unit 440 determines whether to permit the handover request. When determining that the handover request is permitted, the control unit 440 controls the network communication unit 420 to transmit an acknowledgment (HO Request Ack) to the handover request to the eNB 200 over the X2 interface. In contrast, when the control unit 440 determines to reject the handover request, the control unit 440 controls the network communication unit 420 to transmit a negative response (HO Request Nack) to the handover request to the eNB 200 over the X2 interface.
- HO Request Ack acknowledgment
- HO Request Nack negative response
- FIG. 7 is a block diagram of the HeNB GW 500. As illustrated in FIG. 7, the HeNB GW 500 includes a network communication unit 510, a storage unit 520, and a control unit 530.
- the network communication unit 510 performs communication with the MME 300 and the HeNB 400 on the S1 interface.
- the storage unit 520 stores various information used for control by the control unit 530.
- the HeNB 400 under the management of the HeNB GW 500 is registered.
- the control unit 530 controls various functions of the HeNB-GW 500.
- the control unit 530 manages a set of a plurality of HeNBs 400.
- the control unit 530 controls the network communication unit 510 to perform communication with the MME 300 on behalf of the plurality of HeNBs 400.
- the operation sequence 1 is an operation sequence when the UE 100 updates the white list and performs handover to the CSG cell within the white list guarantee time.
- the operation sequence 2 is an operation sequence in the case where handover to the CSG cell is performed after the whitelist guarantee time has elapsed after the whitelist is updated in the UE 100.
- FIG. 8 is a sequence diagram of the operation sequence 1 according to the present embodiment.
- the UE 100 In the initial state of this sequence, the UE 100 is in a connected state and performs communication using the cell of the eNB 200 as a serving cell.
- step S101 the MME 300 transmits a white list update message for updating the white list of the UE 100 to the UE 100 via the eNB 200.
- the white list update message includes information specifying the white list guarantee time.
- step S102 the UE 100 updates its own white list in accordance with the white list update message from the MME 300, records the white list update time, and stores the white list guarantee time included in the white list update message. To do. However, the UE 100 may start a timer for measuring the whitelist elapsed time instead of recording the whitelist update time.
- step S103 the UE 100 receives broadcast information from the HeNB 400 on the BCCH.
- step S104 the UE 100 determines to transmit the measurement report to the serving cell (eNB 200) in response to the occurrence of the trigger for transmitting the measurement report.
- step S105 the UE 100 calculates the whitelist elapsed time based on the whitelist update time and the current time recorded in step S101. Or UE100 acquires whitelist elapsed time based on the value of the timer mentioned above. The UE 100 determines whether or not the whitelist elapsed time is within the whitelist guarantee time.
- the description will be made assuming that the whitelist elapsed time is determined to be within the whitelist guarantee time.
- step S106 the UE 100 transmits a measurement report including the CGI, TAI, CSG ID, Membership status, and whitelist update information (Whitelist Update Info.) To the eNB 200.
- the whitelist update information indicates that the whitelist elapsed time is within the whitelist guarantee time.
- step S107 the eNB 200 determines to perform the handover of the UE 100 to the CSG cell of the HeNB 400 based on the measurement report from the UE 100.
- the preparation stage (Preparation) in the handover procedure starts when it is determined that the UE 100 is to be handed over to the CSG cell.
- the eNB 200 determines whether or not to omit the CSG authentication of the UE 100 by the MME 300 based on the white list update information included in the measurement report.
- the eNB 200 confirms that the whitelist elapsed time is within the whitelist guarantee time based on the whitelist update information, and determines that the CSG authentication is omitted.
- step S108 the eNB 200 transmits a handover request (HO Request) for requesting acceptance of the UE 100 to the HeNB 400 over the X2 interface.
- the handover request includes a Membership status.
- the HeNB 400 determines whether to permit the handover request based on the handover request. Here, the description will be made assuming that the handover request is permitted.
- step S109 the HeNB 400 transmits an acknowledgment (HO Request Ack) to the handover request to the eNB 200 over the X2 interface.
- HO Request Ack an acknowledgment
- step S110 the eNB 200 transmits a handover instruction (HO Command) to the CSG cell to the UE 100 in response to receiving the positive response (HO Request Ack) from the HeNB 400.
- HO Command handover instruction
- HO Request Ack positive response
- FIG. 9 is a sequence diagram of an operation sequence 2 according to the present embodiment. In this sequence, differences from the operation sequence 1 will be mainly described.
- steps S201 to S204 are performed in the same manner as steps S101 to S104 of the operation sequence 1.
- step S205 the UE 100 determines whether or not the whitelist elapsed time is within the whitelist guarantee time.
- description will be made assuming that it is determined that the whitelist elapsed time exceeds the whitelist guarantee time.
- step S206 the UE 100 transmits a measurement report including CGI, TAI, CSG ID, Membership status, and white list update information (Whitelist Update Info.) To the eNB 200.
- the whitelist update information indicates that the whitelist elapsed time exceeds the whitelist guarantee time.
- step S207 the eNB 200 determines to perform the handover of the UE 100 to the CSG cell of the HeNB 400 based on the measurement report from the UE 100. Further, the eNB 200 determines whether or not to omit the CSG authentication of the UE 100 by the MME 300 based on the white list update information included in the measurement report. Here, the eNB 200 confirms that the whitelist elapsed time exceeds the whitelist guarantee time based on the whitelist update information, and determines to perform the CSG authentication.
- step S208 the eNB 200 transmits a CSG authentication request (CSG verification request) of the UE 100 to the MME 300 over the S1 interface.
- the CSG authentication request includes the CSG ID of the CSG cell and the identification information of the UE 100.
- step S209 the MME 300 transmits a response (CSG verification response) indicating the CSG authentication result to the eNB 200 over the S1 interface.
- a response CSG verification response
- the description will be made on the assumption that the response indicates authentication success (Ack).
- step S210 the eNB 200 transmits a handover request (HO Request) for requesting acceptance of the UE 100 to the HeNB 400 over the X2 interface in response to the success of the CSG authentication.
- HO Request handover request
- the whitelist is considered to be synchronized with the CSG subscriber information (CSG Subscription Data) managed by the MME300 immediately after the update, the whitelist elapsed time is within the whitelist guarantee time. If so, it is considered that the reliability of the white list is high, and the CSG authentication of the UE 100 by the MME 300 is omitted. In this case, since a handover procedure that does not pass through the EPC 20 can be applied, the handover procedure to the CSG cell can be made efficient.
- CSG Subscription Data CSG Subscription Data
- the UE 100 transmits whitelist update information together with a measurement report related to the CSG cell to the serving cell (eNB 200).
- the white list update information indicates whether the white list elapsed time is within the white list guarantee time.
- the eNB 200 determines whether the whitelist elapsed time is within the whitelist guarantee time. I can grasp. Therefore, when starting the handover procedure, it can be determined whether or not the handover procedure that does not pass through the EPC 20 can be applied.
- the UE 100 updates the white list according to the white list update message from the MME 300.
- the white list update message includes information specifying the white list guarantee time.
- the whitelist guarantee time can be designated on the EPC 20 side, so that the whitelist guarantee time can be changed as necessary.
- the eNB 200 determines to perform the handover of the UE 100 to the CSG cell, and when it is determined that the whitelist elapsed time is within the whitelist guarantee time based on the whitelist update information, While omitting the CSG authentication of the UE 100 by the MME 300, a handover request is transmitted to the HeNB 400.
- the handover request is transmitted to the HeNB 400 over the X2 interface, so that the CSG cell can be promptly transmitted. Handover can be performed.
- the eNB 200 determines that the UE 100 is to be handed over to the CSG cell and determines that the whitelist elapsed time exceeds the whitelist guarantee time based on the whitelist update information
- the MME 300 is requested for CSG authentication of the UE 100.
- the UE100 to the CSG cell is requested by requesting the MME 300 to perform CSG authentication of the UE100. Can be made possible.
- the eNB 200 determines whether to omit the CSG authentication of the UE 100 by the MME 300.
- HeNB400 determines whether the CSG authentication of UE100 by MME300 is abbreviate
- the operation sequence 1 is an operation sequence when the UE 100 updates the white list and performs handover to the CSG cell within the white list guarantee time.
- the operation sequence 2 is an operation sequence in the case where handover to the CSG cell is performed after the whitelist guarantee time has elapsed after the whitelist is updated in the UE 100.
- FIG. 10 is a sequence diagram of the operation sequence 1 according to the present embodiment.
- the UE 100 In the initial state of this sequence, the UE 100 is in a connected state and performs communication using the cell of the eNB 200 as a serving cell.
- steps S301 to S305 are performed in the same manner as the operation sequence 1 according to the first embodiment.
- step S306 the eNB 200 determines to perform the handover of the UE 100 to the CSG cell of the HeNB 400 based on the measurement report from the UE 100.
- the preparation stage (Preparation) in the handover procedure starts when it is determined that the UE 100 is to be handed over to the CSG cell.
- the eNB 200 does not determine whether to omit CSG authentication based on the whitelist update information included in the measurement report.
- the eNB 200 transmits a handover request (HO Request) for requesting acceptance of the UE 100 to the HeNB 400 over the X2 interface.
- the handover request includes whitelist update information (Whitelist Update Info.) Included in the measurement report from the UE 100 in addition to the Membership status.
- the whitelist update information indicates that the whitelist elapsed time is within the whitelist guarantee time.
- step S308 when receiving the handover request from the eNB 200, the HeNB 400 determines whether to permit the handover request based on the handover request. Specifically, it is determined whether to omit the CSG authentication of the UE 100 by the MME 300 based on the whitelist update information included in the handover request.
- the eNB 200 confirms that the whitelist elapsed time is within the whitelist guarantee time based on the whitelist update information, and determines that the CSG authentication is omitted.
- Step S309 the HeNB 400 determines that the handover request from the eNB 200 is permitted, and transmits an acknowledgment (HO Request Ack) to the handover request to the eNB 200 over the X2 interface.
- HO Request Ack acknowledgment
- Step S310 the eNB 200 transmits a handover instruction (HO Command) to the CSG cell to the UE 100 in response to receiving an affirmative response (HO Request Ack) from the HeNB 400.
- HO Command handover instruction
- HO Request Ack affirmative response
- FIG. 11 is a sequence diagram of an operation sequence 2 according to the present embodiment.
- steps S401 to S405 are performed in the same manner as the operation sequence 2 according to the first embodiment.
- step S406 the eNB 200 determines to perform the handover of the UE 100 to the CSG cell of the HeNB 400 based on the measurement report from the UE 100. Unlike the first embodiment, it should be noted that the eNB 200 does not determine whether to omit CSG authentication based on the whitelist update information included in the measurement report.
- the eNB 200 transmits a handover request (HO Request) for requesting acceptance of the UE 100 to the HeNB 400 over the X2 interface.
- the handover request includes whitelist update information (Whitelist Update Info.) Included in the measurement report from the UE 100 in addition to the Membership status.
- the whitelist update information indicates that the whitelist elapsed time exceeds the whitelist guarantee time.
- step S408 when receiving the handover request from the eNB 200, the HeNB 400 determines whether to permit the handover request based on the handover request. Specifically, it is determined whether to omit the CSG authentication of the UE 100 by the MME 300 based on the whitelist update information included in the handover request.
- the eNB 200 confirms that the whitelist elapsed time exceeds the whitelist guarantee time based on the whitelist update information, and determines to perform the CSG authentication.
- step S409 the HeNB 400 transmits a CSG authentication request (CSG verification request) of the UE 100 to the MME 300 over the S1 interface.
- the CSG authentication request includes the CSG ID of the CSG cell and the identification information of the UE 100.
- step S410 the MME 300 transmits a response (CSG verification response) indicating the CSG authentication result to the HeNB 400 over the S1 interface.
- a response CSG verification response
- the response indicates successful authentication (Ack).
- Step S411 the HeNB 400 determines that the handover request from the eNB 200 is permitted, and transmits an acknowledgment (HO Request Ack) to the handover request to the eNB 200 over the X2 interface.
- HO Request Ack acknowledgment
- step S412 the eNB 200 transmits a handover instruction (HO Command) to the CSG cell to the UE 100 in response to receiving an acknowledgment (HO Request Ack) from the HeNB 400.
- HO Command handover instruction
- HO Request Ack acknowledgment
- the eNB 200 when the eNB 200 determines to perform the handover of the UE 100 to the CSG cell, the eNB 200 transmits whitelist update information together with the handover request to the HeNB 400. .
- the HeNB 400 can determine whether to permit the handover request based on the whitelist update information.
- the HeNB 400 when the HeNB 400 determines that the whitelist elapsed time is within the whitelist guarantee time based on the whitelist update information, the HeNB400 omits the CSG authentication of the UE100 by the MME300 and sends a response to the handover request to the eNB200. Send to.
- the HeNB 400 can permit the handover request from the eNB 200 after confirming the validity of the UE 100 (that is, the validity of the white list).
- the HeNB 400 requests the CME authentication of the UE 100 from the MME 300 when determining that the whitelist elapsed time exceeds the whitelist guarantee time based on the whitelist update information.
- the HeNB 400 requests the MME 300 for CSG authentication of the UE 100 to enable the UE 100 to be handed over to the CSG cell. can do.
- the handover procedure to the CSG cell has been mainly described, but the present invention may be applied to the handover procedure to the hybrid cell.
- the whitelist update information (Whitelist Update Info.) Is information indicating whether the whitelist elapsed time is within the whitelist guarantee time.
- the white list update information may be information indicating the white list update time.
- the whitelist elapsed time is calculated on the base station (eNB 200 or HeNB 400) side.
- the white list update information may be information based on the white list elapsed time or the white list update time, and simply “whether or not CSG authentication by the MME 300 is required (that is, the UE 100 may be a CSG member). It may be information indicating whether or not it is guaranteed.
- the communication control method, the user terminal, the base station, and the home base station according to the present invention can improve the efficiency of the handover procedure to a specific cell, and thus are useful in the mobile communication field.
Abstract
Description
実施形態に係る通信制御方法は、特定セルを形成するホーム基地局と、前記特定セルへのユーザ端末のハンドオーバ手順において前記特定セルへのアクセス権について前記ユーザ端末の認証を行う移動管理装置と、を含む移動通信システムに適用される。前記通信制御方法は、前記ユーザ端末が、自身がアクセス可能な特定セルのリスト(いわゆる、ホワイトリスト)を更新するステップAと、前記リストが更新されてからの経過時間(以下、「ホワイトリスト経過時間」と称する)が所定時間(以下、「ホワイトリスト保証時間」と称する)内であることに応じて、前記ハンドオーバ手順において前記移動管理装置による前記ユーザ端末の認証を省略するステップBと、を有する。
本実施形態においては、リリース10以降の3GPP規格(すなわち、LTE Advanced)に基づいて構成される移動通信システムを例に説明する。
図1は、本実施形態に係る移動通信システムの構成図である。図1に示すように、移動通信システムは、ユーザ端末(UE:User Equipment)100と、基地局(eNB:evolved Node-B)200と、移動管理装置(MME:Mobility Management Entity)300と、ホーム基地局(HeNB:Home evolved Node-B)400と、ゲートウェイ装置(HeNB GW:Home evolved Node-B Gateway)500と、を有する。
以下において、UE100、eNB200、MME300、HeNB400、及びHeNB GW500のそれぞれのブロック構成を説明する。
図3は、UE100のブロック図である。図3に示すように、UE100は、無線送受信部110と、記憶部120と、制御部130と、を含む。
図4は、eNB200のブロック図である。図4に示すように、eNB200は、無線送受信部210と、ネットワーク通信部220と、記憶部230と、制御部240と、を含む。
図5は、MME300のブロック図である。図5に示すように、MME300は、ネットワーク通信部310と、記憶部320と、制御部330と、を含む。
図6は、HeNB400のブロック図である。図6に示すように、HeNB400は、無線送受信部410と、ネットワーク通信部420と、記憶部430と、制御部440と、を含む。
図7は、HeNB GW500のブロック図である。図7に示すように、HeNB GW500は、ネットワーク通信部510と、記憶部520と、制御部530と、を含む。
以下において、本実施形態に係る移動通信システムの動作シーケンス1及び2を説明する。
図8は、本実施形態に係る動作シーケンス1のシーケンス図である。本シーケンスの初期状態において、UE100は接続状態であり、eNB200のセルをサービングセルとして通信を行っている。
図9は、本実施形態に係る動作シーケンス2のシーケンス図である。本シーケンスでは、動作シーケンス1との相違点を主として説明する。
以上説明したように、CSGセルを形成するHeNB400と、CSGセルへのUE100のハンドオーバ手順においてCSGセルへのアクセス権についてUE100のCSG認証を行うMME300と、を含む移動通信システムにおいて、ホワイトリスト経過時間がホワイトリスト保証時間内であることに応じて、ハンドオーバ手順においてMME300によるUE100のCSG認証が省略される。
以下、第2実施形態について、第1実施形態との相違点を説明する。第1実施形態では、MME300によるUE100のCSG認証を省略するか否かの判断をeNB200が行っていた。これに対し、第2実施形態では、MME300によるUE100のCSG認証を省略するか否かの判断をHeNB400が行う。
以下において、本実施形態に係る移動通信システムの動作シーケンス1及び2を説明する。
図10は、本実施形態に係る動作シーケンス1のシーケンス図である。本シーケンスの初期状態において、UE100は接続状態であり、eNB200のセルをサービングセルとして通信を行っている。
図11は、本実施形態に係る動作シーケンス2のシーケンス図である。
以上説明したように、本実施形態では、eNB200は、CSGセルへのUE100のハンドオーバを行うと判断した場合に、ハンドオーバ要求と共にホワイトリスト更新情報をHeNB400に送信する。
上記のように、本発明は各実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。
Claims (12)
- 特定セルを形成するホーム基地局と、
前記特定セルへのユーザ端末のハンドオーバ手順において前記特定セルへのアクセス権について前記ユーザ端末の認証を行う移動管理装置と、
を含む移動通信システムに適用される通信制御方法であって、
前記ユーザ端末が、自身がアクセス可能な特定セルのリストを更新するステップAと、
前記リストが更新されてからの経過時間が所定時間内であることに応じて、前記ハンドオーバ手順において前記移動管理装置による前記ユーザ端末の認証を省略するステップBと、
を有することを特徴とする通信制御方法。 - 前記ユーザ端末が、前記ハンドオーバ手順の前において、前記特定セルに関する測定報告をサービングセルに送信するステップCをさらに有し、
前記ステップCにおいて、前記ユーザ端末は、前記経過時間又は前記リストの更新時刻に関する所定情報を、前記測定報告と共に送信することを特徴とする請求項1に記載の通信制御方法。 - 前記所定情報は、前記経過時間が前記所定時間内であるか否かを示すことを特徴とする請求項2に記載の通信制御方法。
- 前記ステップAにおいて、前記ユーザ端末は、前記移動管理装置からのリスト更新メッセージに応じて前記リストを更新し、
前記リスト更新メッセージは、前記所定時間を指定する情報を含むことを特徴とする請求項3に記載の通信制御方法。 - 前記サービングセルを形成する基地局が、前記特定セルへの前記ユーザ端末のハンドオーバを行うと判断した場合で、かつ、前記所定情報に基づいて前記経過時間が前記所定時間内であると判断した場合に、前記移動管理装置による前記ユーザ端末の認証を省略するとともに、ハンドオーバ要求を前記ホーム基地局に送信するステップDをさらに有することを特徴とする請求項2に記載の通信制御方法。
- 前記基地局が、前記特定セルへの前記ユーザ端末のハンドオーバを行うと判断した場合で、かつ、前記所定情報に基づいて前記経過時間が前記所定時間を超過していると判断した場合に、前記ユーザ端末の認証を前記移動管理装置に要求するステップEをさらに有することを特徴とする請求項5に記載の通信制御方法。
- 前記サービングセルを形成する基地局が、前記特定セルへの前記ユーザ端末のハンドオーバを行うと判断した場合に、ハンドオーバ要求と共に前記所定情報を前記ホーム基地局に送信するステップFをさらに有することを特徴とする請求項2に記載の通信制御方法。
- 前記ホーム基地局が、前記所定情報に基づいて前記経過時間が前記所定時間内であると判断した場合に、前記移動管理装置による前記ユーザ端末の認証を省略するとともに、前記ハンドオーバ要求に対する応答を前記基地局に送信するステップGをさらに有することを特徴とする請求項7に記載の通信制御方法。
- 前記ホーム基地局が、前記所定情報に基づいて前記経過時間が前記所定時間を超過していると判断した場合に、前記ユーザ端末の認証を前記移動管理装置に要求するステップHをさらに有することを特徴とする請求項8に記載の通信制御方法。
- 特定セルへのハンドオーバ手順において前記特定セルへのアクセス権について認証を行う移動管理装置を含む移動通信システムにおいて、サービングセルから前記特定セルへのハンドオーバを行うユーザ端末であって、
自身がアクセス可能な特定セルのリストを更新する制御を行う制御部と、
前記特定セルに関する測定報告を前記サービングセルに送信する送信部と、
を有し、
前記送信部は、前記リストが更新されてからの経過時間又は前記リストの更新時刻に関する所定情報を、前記測定報告と共に送信することを特徴とするユーザ端末。 - 特定セルへのハンドオーバ手順において前記特定セルへのアクセス権について認証を行う移動管理装置と、自身がアクセス可能な特定セルのリストを更新するユーザ端末と、を含む移動通信システムにおいて、前記ユーザ端末のサービングセルを形成する基地局であって、
前記リストが更新されてからの経過時間が所定時間内であることに応じて、前記ハンドオーバ手順において前記移動管理装置による前記ユーザ端末の認証を省略する制御を行う制御部を有することを特徴とする基地局。 - 特定セルへのハンドオーバ手順において前記特定セルへのアクセス権について認証を行う移動管理装置と、自身がアクセス可能な特定セルのリストを更新するユーザ端末と、を含む移動通信システムにおいて、前記特定セルを形成するホーム基地局であって、
前記リストが更新されてからの経過時間が所定時間内であることに応じて、前記ハンドオーバ手順において前記移動管理装置による前記ユーザ端末の認証を省略する制御を行う制御部を有することを特徴とするホーム基地局。
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US10425932B2 (en) | 2014-05-28 | 2019-09-24 | Sony Corporation | Apparatus and method |
US10813087B2 (en) | 2014-05-28 | 2020-10-20 | Sony Corporation | Apparatus and method |
Also Published As
Publication number | Publication date |
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US9288737B2 (en) | 2016-03-15 |
EP2827641A4 (en) | 2015-12-02 |
JP5851585B2 (ja) | 2016-02-03 |
US20150079937A1 (en) | 2015-03-19 |
EP2827641A1 (en) | 2015-01-21 |
JPWO2013137460A1 (ja) | 2015-08-03 |
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