WO2009096521A1 - 無線通信システム、基地局装置、移動制御ノード、無線通信方法 - Google Patents
無線通信システム、基地局装置、移動制御ノード、無線通信方法 Download PDFInfo
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- WO2009096521A1 WO2009096521A1 PCT/JP2009/051578 JP2009051578W WO2009096521A1 WO 2009096521 A1 WO2009096521 A1 WO 2009096521A1 JP 2009051578 W JP2009051578 W JP 2009051578W WO 2009096521 A1 WO2009096521 A1 WO 2009096521A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04W60/02—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration by periodical registration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/06—Registration at serving network Location Register, VLR or user mobility server
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
Definitions
- the present invention relates to a radio communication system, a base station apparatus, a mobile control node, and a radio communication method.
- EUTRAN Evolved UMTS Terrestrial Radio Access Network
- UMTS Universal Mobile Telecommunication System
- EPC Evolved Packet Core 1
- LTE Long Term Evolution
- SAE System Architecture Evolution
- EUTRAN and EPC are sometimes referred to as EPS (Evolved Packet System).
- an eNode B (evolved Node B) 10 that is a base station apparatus is provided on the EUTRAN side.
- CN Core Network
- MME Mobility Management Entity
- S-GW Serving Gateway
- P-GW Serving Gateway
- Packet Data Network Gateway (40) and HSS Home Subscriber Server
- the eNode B 10 is connected to a UE (User Equipment) 60 that is a radio communication device via a radio interface.
- the MME 20 is a node having a mobility control (location registration) function of the UE 60, a handover control function, a selection function of the S-GW 30 and the P-GW 40, a bearer management function, and the like (4.4. 2).
- the S-GW 30 is a node for transferring user plane packet data between the eNode B 10 and the P-GW 40.
- the HSS 50 is a server that stores user information used for authentication of the UE 60.
- a TA Tracking Area
- a TA Tracking Area
- MME 20 Mobile Communications Management Entity
- a list of assigned TAs is registered in the UE 60.
- UE60 detects having moved to TA which is not in the registered list
- the number of TAs allocated to the UE 60 at the time of location registration of the UE 60 is reduced in order to reduce the area for paging to the UE 60 when, for example, paging traffic is high.
- the number of TAs allocated to the UE 60 moving at high speed is increased.
- the UE 60 is considered in consideration of these relationships. It is necessary to optimize the number of TAs to be allocated.
- C # 1 to C # 23 are arranged in each cell C of the plurality of eNode Bs 10. Also, C # 1 to C # 23 belong to any of TA # 1 to TA # 7 as follows.
- the MME 20 assigns a TA to the UE 60 according to a rule manually set by a maintenance person (operator). Further, this rule assigns a plurality of TAs to UE 60 in a fixed manner.
- the MME 20 sends two TA # 1 and TA # 4 to the UE 60. Even if assigned, since it passes TA # 1 and TA # 4 in a few seconds and enters TA # 5, the UE 60 needs to register a new location immediately.
- the actual time when the UE 60 passes TA # 1 and TA # 4 is calculated as follows.
- the location registration of UE 60 is C # 2 eNode B 10 belonging to TA # 1
- the cell diameter of cells belonging to TA # 1 and TA # 4 is 500 m
- the moving speed of UE 60 is 80 km / h.
- the time for the UE 60 to pass through TA # 1 and TA # 4 is 113 seconds ( ⁇ 2500 m / 80 km / h). This numerical value indicates that the UE 60 performs location registration in about 2 minutes. Therefore, the number of location registrations of the UE 60 cannot be reduced.
- the UE 60 outputs paging traffic at the time of incoming calls over a plurality of TA ranges, so that the paging traffic cannot be reduced and a large load is imposed on the radio communication system.
- the configuration in which a plurality of TAs are fixedly assigned to the UE 60 has a problem that an optimal number of TAs cannot be assigned to the UE 60.
- an object of the present invention is to provide a wireless communication system, a base station apparatus, a mobile control node, and a wireless communication method that can solve at least one of the above-described problems.
- the wireless communication system of the present invention includes: A wireless communication system comprising a base station device and a mobile control node, The base station device Transmitting at least one of the location information of the base station device and the information on the cell size of the base station device to the mobility control node; The mobility control node is From the base station apparatus, at least one of position information of the base station apparatus and information regarding a cell size of the base station apparatus is received.
- the base station apparatus of the present invention A transmission unit configured to transmit at least one of position information of the base station device and information on a cell size of the base station device to the mobility control node;
- the first mobility control node of the present invention is: A receiving unit configured to receive at least one of position information of the base station device and information on a cell size of the base station device from the base station device;
- the second mobility control node of the present invention is: A receiving unit that receives information about the movement of the wireless communication device registered in the base station device from the base station device; A control unit that allocates a tracking area based on the information on the arrangement of the base station devices and the information on the movement.
- the first wireless communication method of the present invention includes: A wireless communication method by a base station device, There is a transmission step of transmitting at least one of position information of the base station device and information regarding a cell size of the base station device to a mobility control node.
- the second wireless communication method of the present invention includes: A wireless communication method by a mobile control node, A receiving step of receiving at least one of position information of the base station device and information on a cell size of the base station device from the base station device;
- the base station apparatus is configured to transmit at least one of its own base station apparatus location information and cell size information to the mobile control node.
- the mobile control node can grasp the cell arrangement relationship by receiving at least one of the position information of the base station apparatus and the information on the cell size, the maintenance person for allocating the tracking area This makes it possible to reduce the OPEX associated with the manual operation, and to allocate an optimal number of tracking areas to the wireless communication apparatus.
- FIG. 10 is a flowchart for explaining a processing flow when calculating a TA range in steps 706 and 712 shown in FIG. 9.
- FIG. It is a sequence diagram explaining the operation
- the eNode B 10 includes a transmission unit 11 that transmits information on the position information and the size of the cell of the own eNode B 10 to the MME 20.
- the MME 20 includes a receiving unit 21 that receives information on the position information and the size of the cell of the eNode B 10 from the eNode B 10.
- step 201 the transmission unit 11 of the eNode B 10 transmits information on the position information and the size of the cell of its own eNode B 10 to the MME 20.
- the information transmitted to the MME 20 is received by the receiving unit 21 of the MME 20.
- the MME 20 can grasp the cell arrangement relationship by receiving the information on the cell location information and the size of the eNode B 10, the OPEX accompanying the manual operation of the maintainer for the TA allocation can be performed. The effect that it becomes possible to reduce and it becomes possible to allocate the optimal number of TA to UE60 is acquired.
- the eNode B 10 according to the present embodiment is different from the first embodiment of FIG. 3 in that a receiving unit 12 and a control unit 13 are added.
- the control unit 13 includes the following information regarding the eNode B 10 in the message.
- the cell location information is obtained by using a GPS (Global Positioning System) or the like by a location information measurement unit mounted on the eNode B10. This is information on the latitude and longitude of the cell (for example, the center position of the cell or the center position of the eNode B 10). Further, the cell position information can be information necessary for the position calculation acquired by the eNode B 10 using GPS or the like.
- GPS Global Positioning System
- the cell position information can be information necessary for the position calculation acquired by the eNode B 10 using GPS or the like.
- the cell size may be the cell diameter or radius (eg, 500 m, 1 km, 2 km). Or it can be set as the type (for example, Macro, Micro, Pico, Femto) showing the size of a cell.
- the transmission unit 11 transmits a message including the information (1) to (4) regarding the eNode B 10 to the MME 20.
- the receiving unit 12 receives, from the MME 20, a message including information on the TA assigned to the UE 60 that has registered the location of the eNode B 10 itself.
- transmission / reception of messages by the transmission unit 11, the reception unit 12, and the control unit 13 is also performed with the UE 60.
- the MME 20 according to the present embodiment is different from the first embodiment of FIG. 3 in that a transmission unit 22 and a control unit 23 are added.
- the receiving unit 21 receives a message including the information (1) to (4) related to the eNode B 10 from the eNode B 10.
- the control unit 23 creates a map representing the cell arrangement relationship based on the information (1) to (4) regarding the eNode B 10.
- control unit 23 dynamically assigns an optimal number of TAs to the UE 60 that has registered the location in the eNode B 10 based on the moving speed and moving direction of the UE 60 and the map, and sends information about the allocated TAs as messages. Include in
- the transmission unit 22 transmits a message including information on the TA assigned to the UE 60 that has been registered in the eNode B 10 to the eNode B 10.
- eNode B10 is added to stabilize and optimize communication services according to the traffic volume in a certain area and places such as shadows in the valleys of buildings where radio does not reach from existing eNode B10. , Reduction, rearrangement, etc.
- C # 30 belonging to TA # 1 is newly added to the cell arrangement of FIG.
- step 401 it is assumed that C # 30 eNode B 10 added to TA # 1 is newly added.
- step 402 the transmission unit 11 of the added eNode B 10 transmits a setup message (S1 Setup message) including the information (1) to (4) related to the eNode B 10 to the MME 20.
- a setup message S1 Setup message
- step 403 the control unit 23 of the MME 20 calculates the range of TA # 1 based on the positional information and size information of C # 1 to C # 5 and C # 30 belonging to TA # 1, A new map as shown in FIG. 7 is created and stored in a storage unit (not shown).
- step 404 the transmission unit 22 of the MME 20 transmits a response message (S1 Setup Response message) to the setup message to the eNode B 10.
- control unit 23 of the MME 20 determines that the eNode B 10 whose connection link with the MME 20 is disconnected has been removed, deletes the cell of the removed eNode B 10 from the map, and creates a new map. To the storage unit (not shown).
- step 601 it is assumed that the range covered by the cell of eNode B 10 is changed due to rearrangement or configuration change of eNode B 10 (antenna replacement, antenna direction change, etc.).
- step 602 the transmission unit 11 of the eNode B 10 whose cell coverage has been changed, sends the reconfiguration message (S1 Reconfiguration message) including the information (1) to (4) related to the eNode B 10 to the MME 20 Send to.
- the reconfiguration message S1 Reconfiguration message
- step 603 the control unit 23 of the MME 20 calculates the TA range to which the cell whose cover range has changed belongs, creates a new map, and stores it in a storage unit (not shown).
- step 604 the transmission unit 22 of the MME 20 transmits a response message (S1 Reconfiguration Response message) to the reconfiguration to the eNode B 10.
- the control unit 23 of the MME 20 assigns an optimal number of TAs to the UE 60 based on the moving speed Sue and the moving direction Dir of the UE 60.
- the moving speed Sue of the UE 60 can be calculated from the number of changes in TA assigned at the time of the location registration of the UE 60 within a certain period. Specifically, if the TA number increases, it can be determined that the moving speed of the UE 60 is high, and conversely if the TA number decreases, it can be determined that the moving speed of the UE 60 is low. In addition, you may make it acquire the information of the moving speed of UE60 also with another method. For example, the MME 20 may receive information on the moving speed known by the UE 60 from the UE 60 via the eNode B 10.
- the movement direction Dir of UE 60 can be calculated from the locus of location registration of UE 60 within a certain period.
- the MME 20 may receive information on the moving direction known by the UE 60 from the UE 60 via the eNode B 10.
- C Assignment of TA to UE 60
- UE 60 registers the location of C # 2 eNode B 10 belonging to TA # 1
- the cell diameter of cells belonging to TA # 1 and TA # 4 is 2 km
- UE 60 The moving speed Sue of the UE 60 is 80 km / h
- the moving direction Dir of the UE 60 is the direction from TA # 1 to TA # 4.
- the UE 60 registers the location of the C # 2 eNode B 10 belonging to TA # 1, and the cell diameters of the cells belonging to TA # 1, TA # 4, and TA # 5 are It is assumed that 1.5 km, the moving speed Sue of the UE 60 is 80 km / h, and the moving direction Dir of the UE 60 is the direction from TA # 1 to TA # 4.
- the time for passing through TA # 1, TA # 4, and TA # 5 is 6.8. Minutes ( ⁇ 9.0 km / 80 km / h). That is, since it takes 6 minutes or more for the UE 60 to pass through TA # 1, TA # 4, and TA # 5, three of UE # 1, TA # 4, and TA # 5 are allocated to the UE60.
- the location registration of the UE 60 is the C # 2 eNode B 10 belonging to the TA # 1, but the moving speed Sue of the UE 60 is 0 km / h.
- the UE 60 stays at the company during the day and hardly moves. Therefore, only one TA # 1 to which C # 2 of the location registration destination eNode B 10 belongs is assigned to the UE 60. In this way, by assigning only one TA to the UE 60 that does not substantially move during the day, it is only necessary to provide the paging traffic at the time of incoming call to the TA # 1, thereby reducing the paging traffic and wireless communication. Do not load the system.
- the flow of the TA allocation process to the UE 60 described above is as follows.
- the control unit 23 of the MME 20 first calculates the moving speed Sue of the UE 60 in Step 701, and the moving speed Sue is 0 in Step 702. If there is, in step 703, only one TA to which the cell of the location registration destination eNode B 10 belongs is assigned to the UE 60.
- Step 702 the control unit 23 calculates the moving direction Dir of the UE 60 in Step 704, and in Step 705, the cell of the current TA (location registration destination eNode B 10 is determined). Calculate the range of TA) to which it belongs.
- the TA range is calculated when the moving speed Sue is not 0.
- the moving speed Sue is not limited to 0.
- the TA range is calculated. You may make it calculate.
- the TA range is calculated as shown in FIG. 10, for example.
- step 801 the control unit 23 sets, as x, the number of cells arranged in the moving direction Dir of the UE 60 among the cells belonging to the TA.
- step 802 the control unit 23 sets the next cell number (the first cell number at the time of transition from step 801) as n.
- step 803 the control unit 23 sets the cell n set in step 802 as Dn.
- Set the diameter As the cell diameter, the cell diameter received from the eNode B 10 as the information (2) is used. When the information (2) received from the eNode B 10 is the cell radius or type, the cell diameter is obtained based on the information.
- step 804 the control unit 23 sets a value obtained by adding Dn set in step 803 to the current TAd (0 at the time of transition from step 801) as a TAd representing the range covered by the TA.
- step 805 the control unit 23 sets a new x obtained by subtracting 1 from the current x. If x is 0 in step 806, the control unit 23 sets it in step 804 in step 807. TAd is stored in a storage unit (not shown).
- step 806 the process returns to step 802 and the same processing is repeated until x becomes 0.
- Equation 1 the TA cover range TAd is expressed as in Equation 1 below.
- Equation 1 n represents a cell number.
- control unit 23 sets the current TA range calculated in step 705 as TAd in step 706, sets an initial value 0 as TAdm, and sets a new value in step 707.
- TAd a value obtained by adding TAd and TAdm set in Step 706 is set.
- step 708 the control unit 23 obtains the passing time T for the UE 60 to pass the TA by dividing the TAd newly set in step 707 by the moving speed Sue calculated in step 701.
- Equation 2 the passing time T of the UE 60 is expressed as the following Equation 2.
- Equation 2 m represents a TA number.
- step 709 the control unit 23 determines that the transit time T calculated in step 708 exceeds X minutes, which is a predetermined time (the time required for the UE 60 to pass through all the assigned TAs). If so, in step 710, the current TA is assigned to the UE 60.
- step 708 determines whether the passing time T is less than or equal to X minutes in step 709. If the passing time T calculated in step 708 is less than or equal to X minutes in step 709, the control unit 23 sets the range covered by the next TA in the moving direction of the UE 60 as a new TAdm in step 711. TAd (m + 1) to be expressed is set, and in step 712, TAdm newly set in step 711 is calculated. Thereafter, the process returns to step 707 and the same processing is repeated until the passage time T exceeds X minutes.
- the movement speed Sue and the movement direction Dir are used as the information regarding the movement of the UE 60.
- the invention may be configured to use either one of them.
- a method of assigning TAs in the four directions around the position of the UE 60 can be considered.
- a method of assigning a predetermined number of TAs in that direction is conceivable.
- the eNode B 10 sends a message including information on the location and size of the cell of its own eNode B 10 when the eNode B 10 is added or when the cell coverage is changed. Send to.
- the MME 20 can grasp the cell arrangement relationship based on the cell location information and size information of the eNode B 10, the optimal number of TAs can be dynamically determined as in the first embodiment. The effect that it becomes possible to allocate to UE60 is acquired.
- the MME 20 can assign an optimal number of TAs to the UE 60 that balances the number of location registrations and the number of paging of the UE 60 by considering the moving speed Sue and the moving direction Dir of the UE 60. Is obtained.
- the MME 20 can determine that the eNode B 10 has been removed because the connection link with the eNode B 10 has been disconnected.
- eNode B10 since eNode B10 transmits said information to MME20, the manual operation by the maintenance person for TA allocation can be reduced, and the effect that OPEX can be reduced is also acquired. .
- the MME assigns the TA to the UE based on the information on the arrangement of the eNode B 10 and the information on the movement of the UE.
- TAs can be dynamically assigned.
- the movement of the UE can be, for example, a moving speed or a moving direction.
- the eNode B 10 according to the present embodiment is similar in configuration to the second embodiment illustrated in FIG.
- the eNode B 10 transmits the information (1) to (4) related to the eNode B 10 to the MME 20 when the eNode B 10 is added. Instead, the present embodiment Then, it transmits when UE60 has attached. Note that “attach” refers to the first access to the eNode B 10 of the UE 60, for example, the first access after the power is turned on. Other operations of the eNode B 10 are the same as those in the second embodiment.
- the configuration and operation of the MME 20 according to the present embodiment are the same as those of the second embodiment shown in FIG.
- step 901 the UE 60 transmits a message (Attach Request message) for requesting attachment to the eNode B 10 for attachment.
- the transmission unit 11 of the attachment destination eNode B 10 includes the attachment procedure (Attach procedure) including the information (1) to (4) above and the information of the attach request message (Attach Request message) regarding the eNode B 10. ) Is transmitted to the MME 20 (Initial UE Message message).
- step 903 when the authentication of the UE 60 by the authentication unit (not shown) of the MME 20 using the user information stored in the HSS 50 is successful, in step 904, the transmission unit 22 of the MME 20 requests a message for requesting bearer generation ( Create Default Bearer Request message) is sent to S-GW30.
- a message for requesting bearer generation Create Default Bearer Request message
- step 905 a message (Create Default Bearer Request message) requesting bearer generation is transmitted from the S-GW 30 to the P-GW 40.
- Steps 906 and 907 a response message (Create Default Bearer Response message) to the message requesting bearer generation is transmitted from the P-GW 40 to the MME 20 via the S-GW 30.
- control unit 23 of the MME 20 calculates the TA range to which the cell of the attachment-destination eNode B 10 belongs, creates a new map, stores it in the storage unit, and assigns the TA to the UE 60 that has been attached. Process.
- step 908 the transmission unit 22 of the MME 20 transmits a message (Initial Context Setup Request message) including information on the TA allocated to the UE 60 and a message indicating that the attachment is accepted (Attach Accept message) to the eNode B 10. To do. Subsequently, in step 909, the transmission unit 11 of the eNode B 10 sends a message (Radio Bearer Establishment Request message) including a message (Attach Accept message) indicating acceptance of attachment including information on the TA assigned to the UE 60 to the UE 60. Send.
- a message (Initial Context Setup Request message) including information on the TA allocated to the UE 60 and a message indicating that the attachment is accepted (Attach Accept message) to the eNode B 10.
- the transmission unit 11 of the eNode B 10 sends a message (Radio Bearer Establishment Request message) including a message (Attach Accept message) indicating acceptance of attachment including information on the TA assigned to the
- step 910 the UE 60 transmits a message (Radio Bearer Establishment Response message) including a response message (Attach Complete message) to the eNode B 10 in response to the message indicating that the attachment is permitted.
- step 911 the transmission unit 11 of the eNode B 10 transmits a message (Initial Context Setup Response message) including a response message (Attach Complete message) to the message indicating that the attachment is accepted to the MME 20.
- the eNode B 10 when the eNode B 10 attaches, the eNode B 10 always transmits the latest information on the eNode B 10 because the information (1) to (4) related to the eNode B 10 is transmitted to the MME 20. The effect that it can notify to MME20 is acquired. Other effects are the same as those of the second embodiment.
- the eNode B 10 according to the present embodiment is similar in configuration to the second embodiment illustrated in FIG.
- the eNode B 10 transmits the information (1) to (4) related to the eNode B 10 to the MME 20 when the eNode B 10 is added. Instead, the present embodiment Then, it transmits when UE60 has registered the location. Other operations of the eNode B 10 are the same as those in the second embodiment.
- the configuration and operation of the MME 20 according to the present embodiment are the same as those of the second embodiment shown in FIG.
- the existing MME 20 and S-GW 30 are referred to as Old MME 20-O and Old S-GW 30-O, respectively, and the information contained in the location registration request message (TAU Request message) from the UE 60 by the eNode B 10
- the MME 20 newly selected based on the information is referred to as New MME 20-N
- the S-GW 30 newly selected based on information included in the TAU Request message by the New MME 20-N is referred to as New S-GW 30-N.
- step 1001 the UE 60 transmits a TAU Request message for location registration to the eNode B 10.
- step 1002 the transmission unit 11 of the location registration destination eNode B 10 performs a TA update procedure (TA Update procedure) including the information (1) to (4) above and information on the TAU Request message regarding the eNode B 10.
- TA Update procedure a TA update procedure including the information (1) to (4) above and information on the TAU Request message regarding the eNode B 10.
- a message for starting (Initial UE Message message) is transmitted to the New MME 20-N.
- the transmission unit 22 of the New MME 20-N transmits a message (Context Request message) requesting the context information of the UE 60 to the Old MME 20-O.
- the transmission unit of the Old MME 20-O. 22 transmits a response message (Context Response message) to the message requesting the context information of the UE 60 to the New MME 20-N.
- Step 1005 when the authentication of the UE 60 by the authentication unit (not shown) of the MME 20 using the user information stored in the HSS 50 is successful in Step 1005, the transmission unit 22 of the New MME 20-N performs the context text of the UE 60 in Step 1006. Is sent to the Old MME20-O, and a message (Context Acknowledge message) indicating that it is valid at the New MME20-N and invalidated at the Old MME20-O is sent to the Old MME20-O. (Create Bearer Request message) is sent to the New S-GW30-N.
- Context Acknowledge message indicating that it is valid at the New MME20-N and invalidated at the Old MME20-O is sent to the Old MME20-O.
- Create Bearer Request message is sent to the New S-GW30-N.
- a request message (Update Bearer Request message) for switching the data transfer route from Old S-GW30-O to New S-GW30-N is sent from New S-GW30-N to P-GW40. Is done.
- a message (Update Bearer Response message) is transmitted from the P-GW 40 to the New S-GW 30-N in response to a request message for switching the data transfer route.
- a response message (Create Bearer Response message) to the message requesting bearer generation is transmitted from the New S-GW 30-N to the New MME 20-N.
- a bearer release process related to the Old S-GW 30 -O is performed.
- the control unit 23 of the New MME 20-N has calculated the TA range to which the cell of the location registration destination eNode B 10 belongs, creates a new map, and stores the location in the storage unit. The process which allocates TA to UE60 is performed.
- the transmitting unit 22 of the New MME 20-N sends a message (Initial Context Setup Request message) including the TA information allocated to the UE 60 and a message (TAU Accept message) to accept location registration.
- a message (Initial Context Setup Request message) including the TA information allocated to the UE 60 and a message (TAU Accept message) to accept location registration.
- the transmission unit 11 of the eNode B 10 transmits a message (Radio Bearer Establishment Request message) including a message (TAU Accept message) indicating that the location registration is accepted, including the TA information allocated to the UE 60, to the UE 60. .
- the UE 60 transmits a message (Radio Bearer Establishment Response message) including a response message (TAU Complete message) to the eNode B 10 to accept the location registration.
- the transmission unit 11 of the eNode B 10 transmits a message (Initial Context Setup Response message) including a response message (TAU Complete message) to the message accepting the location registration to the MME 20.
- the eNode B 10 when the eNode B 10 has registered the location, the eNode B 10 always transmits the information (1) to (4) related to the eNode B 10 to the MME 20, so the latest information regarding the eNode B 10 is always updated. Can be notified to the MME 20.
- Other effects are the same as those of the second embodiment.
- the LTE wireless communication system has been described as an example.
- the present invention is not limited to the LTE radio communication system, but can also be applied to other radio communication systems having a mobile control node, a base station apparatus, and a radio communication apparatus.
- the radio communication system in which the mobile control node and the gateway device are separated has been described as an example.
- the present invention also applies to a radio communication system in which the mobile control node and the gateway device are integrated. Can be applied.
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Abstract
Description
TA#2=C#17,C#18,C#19,C#20,C#21,C#22
TA#3=C#6,C#7,C#8
TA#4=C#9,C#10,C#12,C#13,C#14
TA#5=C#16
TA#6=C#11,C#15
TA#7=C#23
一般的に、MME20は、保守者(オペレータ)により手動で設定されたルールにしたがって、UE60にTAを割り当てる。また、このルールは、UE60に固定的に複数のTAを割り当てるものになっている。
3GPP TS 23.401,V8.0.0 3GPP TS 36.300,V8.2.0
基地局装置と、移動制御ノードと、を有してなる無線通信システムであって、
前記基地局装置は、
前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を前記移動制御ノードに送信し、
前記移動制御ノードは、
前記基地局装置から、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する。
基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、移動制御ノードに送信する送信部を有する。
基地局装置から、当該基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する受信部を有する。
基地局装置から、前記基地局装置に位置登録した無線通信装置の動きに関する情報を受信する受信部と、
前記基地局装置の配置に関する情報と前記動きに関する情報とを基に、トラッキングエリアを割り当てる制御部と、を有する。
基地局装置による無線通信方法であって、
前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、移動制御ノードに送信する送信ステップを有する。
移動制御ノードによる無線通信方法であって、
基地局装置から、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する受信ステップを有する。
図3を参照すると、本実施形態に係るeNode B10は、自己のeNode B10のセルの位置情報および大きさに関する情報をMME20に送信する送信部11を有している。
図5を参照すると、本実施形態に係るeNode B10は、図3の第1の実施形態と比較して、受信部12および制御部13が追加された点が異なる。
例えば、セルの位置情報は、eNode B10に搭載された位置情報測定部でGPS(Global Positioning System)等を利用して取得された、eNode B10のセルの位置(例えば、セルの中心位置またはeNode B10の中心位置)の緯度経度の情報である。また、セルの位置情報は、eNode B10がGPS等を利用して取得した、位置計算に必要な情報とすることができる。
例えば、セルの大きさは、セルの直径または半径(例えば、500m、1km、2km)とすることができる。もしくは、セルの大きさを表すタイプ(例えば、Macro、Micro、Pico、Femto)とすることができる。
(4)eNode B10の番号もしくはeNode B10のセルの番号
なお、上記の(2)~(4)は、eNode B10に予め設定されるものである。
まず、eNode B10の増設時の動作について、図6を参照して説明する。
eNode B10の減設時には、減設されたeNode B10のセルが削除されることになるため、MME20は、減設されたeNode B10から通知をもらうことはできない。ただし、eNode B10の減設時には、減設されたeNode B10とMME20との接続リンクが切断されることになる。
次に、eNode B10のセルがカバーするカバー範囲の変更時の動作について、図8を参照して説明する。
UE60の位置登録(TA Update)時に、MME20の制御部23は、UE60の移動速度Sueおよび移動方向Dirを基に、最適な数のTAをUE60に割り当てる。
例えば、UE60の移動速度Sueは、一定期間内のUE60の位置登録時にそれぞれ割り当てたTAの変化数から、計算することができる。具体的には、TA数が増えていれば、UE60の移動速度は高速であると判断でき、逆に、TA数が減っていれば、UE60の移動速度は低速であると判断できる。なお、UE60の移動速度の情報は、その他の方法でも取得するようにしてもよい。例えば、UE60が把握している移動速度の情報を、UE60からeNode B10を経由して、MME20が受信してもよい。
例えば、UE60の移動方向Dirは、一定期間内のUE60の位置登録の軌跡から、計算することができる。なお、UE60の移動方向の情報は、その他の方法でも取得するようにしてもよい。例えば、UE60が把握している移動方向の情報を、UE60からeNode B10を経由して、MME20が受信してもよい。
ここでは、UE60にTAを割り当てる際、UE60が割り当てられた全てのTAを通過するのに、例えば、6分以上かかるようにする。ただし、UE60が割り当てられた全てのTAを通過するのにかかる時間は、6分に限られず、システムの設計に応じて適宜決定することができる。
・具体例1
ここでは、図7に示すように、UE60が位置登録するのがTA#1に属するC#2のeNode B10であり、TA#1およびTA#4に属するセルのセル直径が2kmであり、UE60の移動速度Sueが80km/hであり、UE60の移動方向DirがTA#1からTA#4の方向であるものとする。
・具体例2
ここでは、図7に示すように、UE60が位置登録するのがTA#1に属するC#2のeNode B10であり、TA#1、TA#4、およびTA#5に属するセルのセル直径が1.5kmであり、UE60の移動速度Sueが80km/hであり、UE60の移動方向DirがTA#1からTA#4の方向であるものとする。
・具体例3
ここでは、上記と同様に、UE60が位置登録するのがTA#1に属するC#2のeNode B10であるが、UE60の移動速度Sueが0km/hであるものとする。
(第3の実施形態)
本実施形態に係るeNode B10は、図5に示した第2の実施形態と比較して、構成自体は同様であるが、動作が異なる。
本実施形態に係るeNode B10は、図5に示した第2の実施形態と比較して、構成自体は同様であるが、動作が異なる。
Claims (33)
- 基地局装置と、移動制御ノードと、を有してなる無線通信システムであって、
前記基地局装置は、
前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を前記移動制御ノードに送信し、
前記移動制御ノードは、
前記基地局装置から、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する、無線通信システム。 - 前記基地局装置は、
前記基地局装置の増設時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項1に記載の無線通信システム。 - 前記基地局装置は、
無線通信装置が前記基地局装置にアタッチしてきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項1に記載の無線通信システム。 - 前記基地局装置は、
無線通信装置が前記基地局装置に位置登録してきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項1に記載の無線通信システム。 - 前記基地局装置は、
前記基地局装置のセルのカバー範囲に変更があった時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項2から4のいずれか1項に記載の無線通信システム。 - 前記基地局装置は、
前記基地局装置の位置を測定し、
前記セルの位置情報は、前記測定された位置情報である、請求項1から5のいずれか1項に記載の無線通信システム。 - 前記セルの大きさに関する情報は、当該セルの直径または半径の情報である、請求項1から6のいずれか1項に記載の無線通信システム。
- 前記セルの大きさに関する情報は、当該セルの大きさを表すタイプの情報である、請求項1から6のいずれか1項に記載の無線通信システム。
- 前記移動制御ノードは、
前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を基に、セルの配置関係を表すマップを作成する、請求項1から8のいずれか1項に記載の無線通信システム。 - 前記移動制御ノードは、
前記移動制御ノードとの接続リンクが切断された基地局装置のセルを前記マップから削除する、請求項9に記載の無線通信システム。 - 前記移動制御ノードは、
前記基地局装置に位置登録してきた無線通信装置に対し、当該無線通信装置の移動速度および移動方向と前記マップとを基に、トラッキングエリアを割り当てる、請求項9または10に記載の無線通信システム。 - 基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、移動制御ノードに送信する送信部を有する基地局装置。
- 前記送信部は、
前記基地局装置の増設時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項12に記載の基地局装置。 - 前記送信部は、
無線通信装置が前記基地局装置にアタッチしてきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項12に記載の基地局装置。 - 前記送信部は、
無線通信装置が前記基地局装置に位置登録してきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項12に記載の基地局装置。 - 前記送信部は、
前記セルのカバー範囲に変更があった時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項13から15のいずれか1項に記載の基地局装置。 - 基地局装置から、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する受信部を有する移動制御ノード。
- 前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を基に、セルの配置関係を表すマップを作成する制御部をさらに有する、請求項17に記載の移動制御ノード。
- 前記制御部は、
前記移動制御ノードとの接続リンクが切断された基地局装置のセルを前記マップから削除する、請求項18に記載の移動制御ノード。 - 前記制御部は、
前記基地局装置に位置登録してきた無線通信装置に対し、当該無線通信装置の移動速度および移動方向と前記マップとを基に、トラッキングエリアを割り当てる、請求項18または19に記載の移動制御ノード。 - 基地局装置から、前記基地局装置に位置登録した無線通信装置の動きに関する情報を受信する受信部と、
前記基地局装置の配置に関する情報と前記動きに関する情報とを基に、トラッキングエリアを割り当てる制御部と、を有する移動制御ノード。 - 基地局装置による無線通信方法であって、
前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、移動制御ノードに送信する送信ステップを有する無線通信方法。 - 前記送信ステップでは、
前記基地局装置の増設時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項22に記載の無線通信方法。 - 前記送信ステップでは、
無線通信装置が前記基地局装置にアタッチしてきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項22に記載の無線通信方法。 - 前記送信ステップでは、
無線通信装置が前記基地局装置に位置登録してきた時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項22に記載の無線通信方法。 - 前記送信ステップでは、
前記セルのカバー範囲に変更があった時に、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を、前記移動制御ノードに送信する、請求項23から25のいずれか1項に記載の無線通信方法。 - 移動制御ノードによる無線通信方法であって、
基地局装置から、前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を受信する受信ステップを有する無線通信方法。 - 前記基地局装置の位置情報および前記基地局装置のセルの大きさに関する情報の少なくとも一方を基に、セルの配置関係を表すマップを作成するマップ作成ステップをさらに有する、請求項27に記載の無線通信方法。
- 前記マップ作成ステップでは、
前記移動制御ノードとの接続リンクが切断された基地局装置のセルを前記マップから削除する、請求項28に記載の無線通信方法。 - 前記基地局装置に位置登録してきた無線通信装置に対し、当該無線通信装置の移動速度および移動方向と前記マップとを基に、トラッキングエリアを割り当てる割当ステップをさらに有する、請求項28または29に記載の無線通信方法。
- 基地局装置と、移動制御ノードと、を有してなる無線通信システムであって、
前記基地局装置は、
前記基地局装置のセルの大きさに関する情報を前記移動制御ノードに送信し、
前記移動制御ノードは、
前記基地局装置から、前記基地局装置のセル大きさに関する情報を受信する、無線通信システム。 - 前記基地局装置のセルの大きさに関する情報は、当該セルの大きさを表すタイプの情報である、請求項31に記載の無線通信システム。
- 前記基地局装置のセルの大きさに関する情報は、セットアップメッセージにて送信される、請求項31または32に記載の無線通信システム。
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