WO2008023792A1 - Dispositif de réseau de noyau, dispositif de station de base de communication radio, et procédé de communication radio - Google Patents
Dispositif de réseau de noyau, dispositif de station de base de communication radio, et procédé de communication radio Download PDFInfo
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- WO2008023792A1 WO2008023792A1 PCT/JP2007/066446 JP2007066446W WO2008023792A1 WO 2008023792 A1 WO2008023792 A1 WO 2008023792A1 JP 2007066446 W JP2007066446 W JP 2007066446W WO 2008023792 A1 WO2008023792 A1 WO 2008023792A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
Definitions
- Core network apparatus radio communication base station apparatus, and radio communication method
- the present invention relates to a core network device, a non-spring communication base station device, and a wireless communication method that provide a multimedia broadcast / multicast service (MBMS).
- MBMS multimedia broadcast / multicast service
- UMTS Universal Mobile Telecommunications System
- GSM Global System for Mobile Communications
- CN GSM Core Network
- WCDMA Wideband Code
- UMTS provides MBMS.
- MBMS is a more advanced service for multicasting multimedia data to users who have subscribed to the service just by broadcasting multimedia data.
- MBMS provides news channels, music channels, movie channels, and so on.
- Non-Patent Documents 1, 2, and 3 describe the architecture and processing procedures thereof.
- FIG. 1 is a diagram illustrating a reference architecture that supports MBMS in a 3GPP UMTS network.
- the UMTS is composed of a terminal (User Equipment: UE) 10, a UTRAN 20, and a core network (Core Network: CN) 30.
- UE User Equipment
- UTRAN User Equipment
- CN Core Network
- UTRAN20 is composed of one or more radio network subsystems (RNS).
- RNS is composed of one radio network controller (RNC) 23 and RNC23. It consists of one or more Node Bs (base stations) 21 to be managed.
- RNC radio network controller
- the RNC 23 is responsible for allocation and management of radio resources, and is responsible for the role of an access point with the CN 30.
- the Node B 21 receives information transferred from the physical layer of the UE 10 via the uplink, and conversely transfers data to the UE 10 via the downlink.
- NodeB21 is UE10
- UTRAN 20 configures and maintains a radio access bearer (RAB) for a call between UE 10 and CN 30.
- RAB radio access bearer
- the CN 30 requests an end-to-end quality of service (QoS) requirement from the RAB, and the corresponding RAB supports the QoS requirement set by the CN 30. Therefore, UTRAN20 is able to meet the end-to-end QoS requirements by configuring and maintaining RAB.
- QoS quality of service
- MBMS is provided through a packet switching service.
- RNC 23 is connected to SGSN (Serving GPRS Support Node) 35 and GGSN (Gateway GPRS Support Node) 37 of CN 30.
- SGSN35 supports communication with RNC23
- GGSN37 manages connections with other packet switching networks such as the Internet.
- MBMS is a downlink dedicated service that provides streaming or background service to multiple UEs 10 using a common or dedicated downlink channel.
- MBMS is classified into a broadcast mode and a multicast mode.
- MBMS broadcast mode it is easy to transfer multimedia data to all users in the broadcast area.
- the MBMS multicast mode it is easy to transfer multimedia data to a specific user group in the multicast area.
- the broadcast area is an area where broadcast service is possible
- the multicast area is an area where multicast service is possible.
- a user who wants to receive MBMS can use the service provided by the network (Service
- service guidance is to notify the UE of a list of services to be provided in the future and related information.
- the user also receives a service notification provided by the network.
- service notification is forwarded It is to notify UE of information related to broadcast data.
- a multicast subscription group is a group of users who have undergone the subscription procedure!
- Users who have joined a multicast subscription group can join a multicast group, that is, a user group that receives the specific multicast service, in order to receive the specific multicast service.
- a multicast group is a group of users who receive a specific multicast service. Participation refers to joining a multicast group gathered to receive a specific multicast service, and is also referred to as MBMS multicast activation. Therefore, the user can receive specific multicast data by MBMS multicast activation (or participation P).
- the RNC 23 transfers MBMS user data to the UE 10 via the Node B 21 via the user plane of the UTRAN protocol.
- UT RAN20 configures and maintains a radio bearer for calls between UE10 and CN30.
- MB MS radio bearers are transferred only on the downlink.
- the MBMS radio bearer is responsible for transferring user data of one specific MBMS transferred from CN 30 to UTRAN 20 only to a specific UE.
- UTRAN 20 needs to confirm the existence of the UE in the entire service area in order to distribute MBMS user data only to Node B 21 where the user is present. Therefore, the UTRAN 20 counts the number of UEs. UTRAN 20 provides information on MBMS using the MBMS common control channel or notifies UE 10 that it is currently counting! / When paging for a specific MBMS group.
- UE10 counts for the corresponding service from the service notification regarding MBMS! /, And when it receives information, it indicates that it wants to receive the corresponding MBMS! /
- an RRC connection (UE10 RRC entity) is transmitted by transferring an RRC connection request (Connection Request) message to UTRAN via an uplink common channel.
- Utility and UTRAN20 RRC entity the UE 10 is notified to the UTRAN 20 that the UE 10 wants to receive the corresponding MBMS using the RRC connection request message.
- the UTRAN 20 can recognize the presence of a user requesting a specific MBMS in the cell by recognizing the UE 10 that has transmitted the RRC connection request message. If even one user is V, the MBMS radio Set the
- FIG. 2 shows conceptual diagrams of the two transfer methods.
- the first is called single cell transmission (SCT), as shown on the right side of Fig. 2, and counts to confirm the presence of a user and transmits data only to the cell where the user is located. Also, when the quality deteriorates at the cell edge or the like, the reception quality of the user is improved by resending or changing the modulation method.
- SCT single cell transmission
- the second is called multi-cell transmission (MCT) as shown on the left side of FIG. 2, and belongs to the same frequency area (Single Frequency Ne twork: SFN) regardless of the presence or absence of users.
- MCT multi-cell transmission
- SFN Single Frequency Ne twork
- Non-Patent Document 1 3GPP TS 23.246 3rd Generation Partnership Project; Technical Spec incation roup services and system Aspects, Multimedia Broadcast / Multicast 3 ⁇ 4ervi ce (MBMS), Architecture and functional description ", 2006-06
- Non-Patent Document 2 3GPP TS 25.346 "3rd Generation Partnership Project, Technical Specification Group Radio Access Network, Introduction of the Multimedia Broadcast Multicast Service (MBMS) in the Radio Access Network (RAN), Stage 2", 2006—06
- Patent Document 3 3GPP TS 25.331 "3rd Generation Partnership Project, Technical Specification Group Radio Access Network, Radio Resource control (RRC), Protocol Specification", 2006-06
- T Since T is selected, it has the following problems.
- An object of the present invention is to provide a core network device, a wireless communication base station device, and a wireless communication method for improving the utilization efficiency of wireless resources of the entire network without increasing the battery consumption of the UE. .
- the core network device of the present invention includes a user number counting means for counting the number of users participating in a multimedia broadcast / multicast service (MBMS) in units of location registration areas, the counted number of users and a predetermined threshold value. If the number of users is equal to or greater than the threshold, a plurality of radio communication base station devices belonging to the same frequency area select multi-cell transfer for transferring MBMS data in synchronization, and the number of users is less than the threshold.
- a single wireless communication base station apparatus including a user participating in the MBMS in a cell selects a single cell transfer for transferring MBMS data, and a selected multi-cell transfer or single cell transfer.
- a notifying unit for notifying the subordinate radio communication base station apparatus.
- the radio communication base station apparatus of the present invention is a multimedia broadcast / multicast service (MB) in which a plurality of radio communication base station apparatuses belonging to the same frequency area are synchronized.
- MB multimedia broadcast / multicast service
- MS Multi-cell transfer that transfers data or a single wireless communication base station device that includes users participating in MBMS in the cell acquires single cell transfer instructions for transferring MBMS data from the core network device; Only when the cell transfer instruction is obtained, the counting means for counting the cells managed by the device itself, and the transfer means for transferring MBMS data to the cell where the user exists as a result of the counting.
- the structure to comprise is taken.
- the wireless communication method of the present invention includes a core network device capability S, a user count counting step for counting the number of users participating in a multimedia broadcast / multicast service (MBMS) in units of location registration areas, The number of users is compared with a predetermined threshold, and when the number of users is equal to or greater than the threshold, a plurality of radio communication base station apparatuses belonging to the same frequency area select multi-cell transfer in which MBMS data is transferred synchronously, When the number of users is less than the threshold, a single radio communication base station apparatus including users participating in the MBMS in a cell selects a single cell transfer for transferring MBMS data, and a selected user number comparison step A notification step of notifying multi-cell transfer or single-cell transfer to a radio communication base station apparatus under the core network apparatus; and radio communication Only when the ground station device acquires the multi-cell transfer or single-cell transfer instruction from the core network device and the single-cell transfer instruction is counted, the cell managed by the radio communication base station device is counted
- FIG. 3 is a diagram showing a network configuration according to the first embodiment of the present invention.
- FIG. 4 Block diagram showing the configuration of the MME shown in FIG.
- FIG.8 Sequence diagram showing the mode switching procedure to SCT force, MCT, etc.
- FIG. 9 is a block diagram showing the configuration of the eNB according to Embodiment 1 of the present invention.
- FIG. 10 is a flowchart showing a recount procedure in the eNB according to Embodiment 2 of the present invention.
- FIG. 11 is a block diagram showing the configuration of the eNB according to Embodiment 2 of the present invention.
- FIG. 12 is a block diagram showing a configuration of a UPE according to the third embodiment of the present invention.
- FIG. 13 is a sequence diagram showing a session start procedure according to Embodiment 3 of the present invention.
- FIG. 14 is a sequence diagram showing an inquiry about the MBMS provision status between eNBs according to Embodiment 4 of the present invention.
- FIG. 15 is a block diagram showing a configuration of a UE according to Embodiments 5 and 6 of the present invention.
- FIG. 16 is a block diagram showing the configuration of the eNB according to Embodiments 5 and 6 of the present invention.
- FIG. 3 is a diagram showing a network configuration according to Embodiment 1 of the present invention.
- the network shown in FIG. 3 includes a terminal (User Equipment: UE) 100, a radio base station device (Evolved Node B: eNB) 120, a mobility management device (Mobility Management Entity: MME) 140, a user plane device (User Plane Entity: The eNB 120, the MME 140, and the UPE 160 are connected to each other via an IP network.
- UE User Equipment
- eNB Radio base station device
- MME Mobility Management Entity
- MME Mobility Management Entity
- the eNB 120, the MME 140, and the UPE 160 are connected to each other via an IP network.
- the eNB 120 is responsible for radio resource allocation and management, receives information transferred from the physical layer of the UE 100 via the uplink, and conversely transfers data to the UE 100 via the downlink.
- eNB120 is a radio access network for UE100. Responsible for the role of the access point.
- the MME 140 manages the position of the UE 100 in units of position registration areas (Tracking Area: TA), and performs signaling regarding the setting, correction, and release of the RAB with the UE 100.
- the MME 140 is allocated in the network connection procedure of the UE 100, and maintains a context related to the MBMS of the UE 100. There are multiple MME140 within a certain MBMS area, and the MME connected to each user is different.
- UPE 160 acts as a gateway to the external network, forwards the downlink packet to the eNB to which UE100 is connected according to the RAB setting, and forwards the uplink packet to the appropriate external address according to the destination address of the packet. Transfer to the network. There is only one UPE 160 per MBMS in a certain MBMS area, and the context related to MBMS is maintained.
- the BM-SC 180 is located between the MBMS content server and the UPE 160, and transfers information on session types, service start and end, and MBMS data to the UPE 160.
- FIG. 4 is a block diagram showing a configuration of MME 140 shown in FIG.
- the input unit 141 notifies the user information management unit 142 of the signals input from the BM-SC 180, the UPE 160, and the eNB 120.
- the user information management unit 142 compares the MB100 reception performance of the UE 100 with the performance of the UE 100 required for the service included in the MBMS registration response notified from the BM-SC 180. As a result of this comparison, when the MBMS reception capability S of the UE 100 exceeds the UE 100 performance required for the service, the user count counting unit 143 is notified of the identifiers related to the location registration area to which the service and the UE 100 belong. If the MBMS reception performance of the UE 100 is lower than the UE 100 performance required for the service, the BM-SC 180 and the UE 100 are notified of the suspension of processing.
- the user count counting unit 143 counts the number of users participating in each service in units of location registration areas, and updates the number of users according to the service and location registration area identifier notified from the user information management unit 142. To do.
- the updated number of users is output to the output unit 144.
- MME140 substitutes UE location registration and counts the number of users. And force S.
- the output unit 144 includes the number of users output from the user number counting unit 143 in the MBMS registration update, and sends the MBMS registration update to the UPE 160.
- FIG. 5 is a block diagram showing a configuration of UPE 160 shown in FIG.
- the input unit 161 notifies the parameter unit 162 and the user number counting unit 163 of the signals input from the BM-SC 180, the MME 140, and the eNB 120.
- the input unit 161 notifies the user count unit 163 of the number of MBMS users included in the MBMS registration update for each location registration area for each service.
- the parameter unit 162 manages various parameters related to the data path, and outputs the service data input from the BM-SC 180 from the output unit 165 according to the parameter settings.
- the number-of-users counting unit 163 counts the number of participating users for each service in units of location registration areas. Since there are multiple MME140s in the MBMS area, the number of users managed by UPE160 is the total number of users notified from each MME. Therefore, the UPE 160 can know the number of users participating in the service existing in the MBMS area for each location registration area.
- the user count unit 163 that has received the MBMS registration update updates the number of users participating in the service, and outputs the updated number of users to the user number comparison unit 164.
- the number-of-users comparison unit 164 compares the number of users output from the number-of-users counting unit 163 with a predetermined threshold value for each location registration area. As a result of the comparison, if the number of users is greater than or equal to the threshold, select MCT as the transfer mode in the location registration area, and select SCT if the threshold is not met. An identifier indicating the selected MCT or SCT is output to the output unit 165.
- the output unit 165 as a notification unit outputs the service data output from the parameter unit 162 and the identifier indicating the MCT or SCT output from the user number comparison unit 164 to the eNB 120.
- FIG. 6 is a sequence diagram showing a procedure for joining a multicast subscription group.
- step (hereinafter abbreviated as “ST”) 201 UE 100 that has received the service guidance sends a multicast subscription request to MM E 140.
- This multicast subscription request includes an identifier indicating the subscribed! / Multicast group.
- the MME 140 that has received the multicast subscription request performs a user approval procedure with the BM-SC 180. This approval procedure is performed based on the subscriber contract information of the user, and determines whether the user can receive the service correctly.
- MME140 sends an MBMS context activation request to UE100.
- UE 100 that has received the MBMS context activation request sends an MBMS context activation request to MME 140.
- the MBMS context activation request includes performance for receiving UE100's own MBMS.
- the MME 140 that has received the MBMS context activation request sends an MBMS registration request to the BM-SC 180 in ST205. If the UE 100 is not the first participant in the multicast group of the service, the processing of ST205 and ST206 is not performed.
- the MBMS registration request includes the UPE160 identifier for distributing MBMS data.
- the BM-SC 180 that has received the MBMS registration request transmits an MBMS registration response including the performance of the UE 100 required for the service to the MME 140.
- the MME 140 counts the number of users participating in each service for each location registration area, and updates the number of MME users.
- MME140 sends MBMS registration update to UPE160.
- the MBMS registration update includes the number of MBMS users for each updated location registration area.
- ST209 the number of users participating in the service existing in the UPE160-powered MBMS area is counted for each location registration area, and the number of UPE users is updated.
- MME140 force S MME140 force S
- MBMS context activation acceptance is transmitted to UE.
- the procedure for joining the user to the multicast subscription group is completed.
- updating the number of MME users can be done by leaving users from the multicast group,
- the location registration area of E100 is updated, it is updated in the same way, and the update result is notified to UPE160, and UPE160 also updates the number of UPE users.
- the session start procedure will be described with reference to FIG.
- the BM-SC 180 detects the start of service of an MBMS, it sends a session start request to the UPE 160 in ST301.
- the user number comparison unit 164 of the UPE 160 that has received the session start request compares the number of users participating in the service existing in the MBMS area with a predetermined threshold value for each location registration area. Is done. If the number of participating users is greater than or equal to the threshold, MCT is selected as the transfer mode in the location registration area, and if it is less than the threshold, SCT is selected.
- the service notification power ⁇ 120 and UE100 are notified through the output unit 165, and the UE100
- the service can be received anywhere in the location registration area, and no further processing is required.
- the session start request in ST303 includes an identifier indicating MCT or SCT, and the eNB 120 that has received the session start request thereby determines whether to perform service notification or to count. .
- the notification / counting notification of ST304 includes information indicating whether or not to count, and UE 100 determines whether or not to respond to the count.
- eNB 120 is the IP network between eNB 120 and UPE 160.
- a multicast group join request is sent to the UPE.
- each IP router and UPE 160 stores the output interface where the user participating in the service is stored, and thereafter transfers the MBMS data only to the necessary output interface.
- the RRC connection between UE 100 and eNB 120 established in ST 305 of the session start procedure is limited to the control plane that transmits and receives only control signals.
- RLC Radio Link Control
- Media Access Control Media Access Control: It has only an entity related to MAC, and reports the channel quality necessary for UE100 user plane data transmission / reception (CQI report) and does not monitor the downlink common control channel.
- the state in which only the control plane is active is limited between the eNB 120 and the UE 100, and no information is provided to the MME 140 that performs location management of the UE 100. UE100 location management will continue.
- the eNB 120 Since the eNB 120 maintains the RRC connection with the UEIOO, the eNB 120 can manage the position of the UEIOO in units of cells. Therefore, when the UE 100 moves to another adjacent eNB, a normal handover procedure is executed, and the RRC connection with the UE 100 is transferred to the destination eNB.
- the destination eNB detects that the MBMS user has moved under its control, and if the service is not provided, outputs a multicast group join request and newly provides the service. In addition, if there is no other UE 100 participating in the multicast group, the source eNB announces the UPE 160 to leave the multicast group.
- the UE 100 in the active state measures the reception quality of neighboring cells, and notifies the eNB 120 of the measurement result periodically or for each event.
- the eNB 120 that has received the neighbor cell reception quality measurement result reported from the UE 100 detects that the UE 100 is near the boundary with the neighbor cell.
- FIG. 8 is a sequence diagram showing a mode switching procedure from SCT to MCT
- FIG. 9 is a block diagram showing a configuration of eNB 120 according to Embodiment 1 of the present invention.
- ST401 UE100 power is measured according to a predetermined condition, and the reception quality of neighboring cells is measured, and the measurement result is notified to s-eNB (movement source eNB).
- s-eNB movement source eNB
- the tNB that has received the multicast group join request sends a multicast group join request to the UPE 160 through the output unit 125 when there is a resource to participate in the MBMS.
- the multicast group participation request includes the s—eNB identifier and information indicating switching to the MCT.
- the UPE 160 that has received the multicast group join request Switch the transfer mode to MCT, perform scheduling so that s-eNB and t-eNB can output data in synchronization in ST406, and notify the scheduling results to s-eNB and t eNB respectively.
- the parameter unit 122 of the s-eNB and t-eNB that has received the scheduling result stores the notified scheduling information and notifies the output unit 125 of it.
- the output unit 125 of the s-eNB and the t-eNB transmits MBMS data at a determined timing, and the UE 100 receives signals synthesized from a plurality of cells, so that reception quality is improved.
- the input unit 121 notifies the signal input from the UE 100, MME 140, UPE 160, and eNB 120 to the parameter unit 122, the cell edge detection unit 123, and the multicast processing unit 124.
- the parameter unit 122 manages various parameters set by signaling with the UE 100, MME 140, UPE 160, and eNB 120.
- the MBMS data is output as a transfer unit according to the parameters specified by the parameter unit 122. Output from 125.
- the cell edge detection unit 123 of the s-eNB that has received the measurement result detects that the UE 100 is at a boundary with a neighboring cell, and outputs the identifier of the neighboring cell to the multicast processing unit 124.
- the multicast processing unit 124 is the own device power eNB
- the multicast node requests the t eNB that manages the neighboring cell based on the identifier of the neighboring cell output from the cell edge detection unit 123 to join the multicast group. Is sent through the output unit 125.
- the multicast processing unit 124 receives the group participation request, and if there is a resource participating in the MBMS, sends the multicast group participation request to the UPE 160 through the output unit 125. .
- the number of UEs that have performed location registration is counted, and if the counted number of UEs is equal to or greater than a predetermined threshold, If MCT is selected and the number of counted UEs is less than a predetermined threshold, SCT and MCT can be switched appropriately according to the number of UEs by selecting SCT, so that unnecessary data distribution by MCT Can be reduced, and wasteful counts due to SCT can be reduced, thereby reducing notch consumption.
- the power S for detecting that UE 100 is at the boundary with a neighboring cell from the reception quality measurement result from UE 100, the missing data that UE 100 sends to eNB 120 when the reception quality deteriorates The eNB 120 may request the neighboring cell to participate in the multicast group when receiving the NACK by using the NACK that prompts retransmission.
- the user number comparison process shown in ST302 of FIG. 7 may be performed in units of a plurality of location registration areas with the number of UEs in the location registration area unit.
- Embodiment 2 of the present invention a case will be described in which UE 100 again transitions to the idle state after selecting SCT and performing counting.
- FIG. 10 is a flowchart showing a recount procedure in eNB 130 according to Embodiment 2 of the present invention.
- FIG. I; L is a block diagram showing a configuration of eNB 130 according to Embodiment 2 of the present invention.
- the recount procedure will be described with reference to these drawings.
- the eNB 130 notifies the accumulation count comparison unit 131 of the input signal from the UE 100 through the input unit 121 as an acquisition unit.
- the parameter selection unit 132 sets the first PF value (parameter) when starting the re-counting procedure.
- the first PF value selected by the Notification / Counting notification is output to the output unit.
- Receive PF value UE100 compares the random number generated by itself with the received PF value, and sends a response message if the random number is less than or equal to the PF value, and receives the next PF value if the random number is greater than the SPF value. Wait until you believe.
- input section 121 of eNB 130 receives the response message from UE 100, and notifies received count response message to cumulative count comparison section 131.
- cumulative count comparison section 131 as a counting means cumulatively counts the number of received response messages, and in ST505, compares whether the accumulated count value is equal to or greater than a predetermined threshold value. . If the cumulative count value is greater than or equal to the threshold (YES), the process proceeds to ST508, and if the cumulative count value is less than the threshold (NO), the process proceeds to ST506.
- cumulative count comparing section 131 determines whether or not the number of trial times S in ST502 to ST505 has reached a predetermined number (predetermined value). If the number of trials reaches the predetermined value! / (Yes), the process proceeds to ST509. If the number of trials reaches the predetermined value! /, (No), the process proceeds to ST507.
- parameter selection unit 132 selects a PF value that is larger than the PF value used this time. In the next trial, a PF value larger than this time will be selected, so it is expected that there will be a large number of UEs 100 that send response messages.
- the accumulated count value exceeds the threshold value in the determination of ST505
- the accumulated count comparison unit 131 uses the recount cycle selection unit 133 to select the power cycle, and the parameter Notifies the selector 132 to select the next first PF value.
- the cumulative count comparison unit 131 sends a recount cycle to the recount cycle selection unit 133.
- the parameter selector 132 is notified to select the next first PF value.
- the eNB 130 knows that there are only a few MBMS users in the subordinate cell, and in a cell with a small number of users, it can be considered that all users are no longer in that cell. Set to a short recount period (default value). As a result, it is possible to quickly detect when the number of users in the cell becomes 0, and by stopping the MBMS data distribution to the cell, it is possible to improve the utilization efficiency of wireless resources in the entire network. it can.
- the parameter selection unit 132 sets the first PF value large because the probability that the uplink is congested is low in the next recount. Thereby, the time required to complete the recount can be reduced.
- Embodiment 2 when it is determined that the number of users in the cell is large due to the recount performed in the SCT, the battery power consumption of the UE is reduced by increasing the recount cycle. By reducing the initial PF value, the interference and load on the uplink due to simultaneous response can be reduced. On the other hand, when it is determined that the number of users in the cell is small, it is possible to quickly detect the case where the number of users in the cell becomes 0 by shortening the recount period, and the MBMS data to the cell If the distribution is stopped, the use efficiency of the radio resources of the entire network can be improved, and the time required to complete the recount can be reduced by increasing the initial PF value. .
- the number of users in the cell is divided into two types, that is, a large number or a small number, but the present invention is not limited to this, and the number of users in the cell is divided into two or more types. You can control the recount period and PF value! /.
- Embodiment 3 of the present invention a case will be described in which after selecting an SCT and performing counting, the transfer mode is selected again according to the distribution of eNBs 120 where MBMS users exist.
- FIG. 12 is a block diagram showing a configuration of UPE 170 according to Embodiment 3 of the present invention.
- an input unit 171 notifies a signal input from the BM-SC 180, the MME 140, and the eNB 120 to the parameter unit 162, the user count unit 163, and the eNB distribution determination unit 172.
- the input unit 171 is included in the MBMS registration update and notifies the user count unit 163 of the number of MBMS users for each location registration area for each service.
- the eNB distribution determination unit 172 is notified of the eNB identifier that is included in the multicast group participation request and indicates the eNB 120 where the MBMS user exists.
- the eNB distribution determination unit 172 determines the distribution of the eNB 120 where the MBMS user exists, that is, the distribution for the entire location registration area. As a result of the determination, if the distribution of the eNB 120 where the MBMS user exists satisfies the predetermined condition, the MCT is selected as the transfer mode in the location registration area, and if the condition is not satisfied, the SCT is continuously selected. An identifier indicating the selected MCT or SCT is output to the output unit 173.
- the output unit 173 serving as a notification unit includes service data output from the parameter unit 162, an identifier indicating the MCT or SCT output from the user number comparison unit 164, and the MCT output from the eNB distribution determination unit 172.
- An identifier indicating the SCT is output to the eNB 120.
- eNB 120 sends a multicast group join request to UPE 170 in order to form an IP multicast tree in the IP network between eNB 120 and UPE 170.
- eNB120 includes the identifier which shows self in a multicast group participation request as an eNB identifier.
- Each IP router that has received the multicast group join request stores the output interface in which the user joining the service is located.
- the UPE 170 that has received the multicast group participation request temporarily stores the eNB identifier included in the multicast group participation request in the eNB distribution determination unit 172.
- the eNB distribution determination unit 172 is a location registration area Calculate the ratio of the number of eNBs with MBMS users to the total number of eNBs. If the ratio is greater than or equal to a predetermined threshold, select MCT as the transfer mode in the location registration area, and if it is less than the threshold, select SCT.
- MCT Mobility Management Entity
- the process proceeds to ST603.
- SCT SCT is selected, the UPE 170 stores an output interface in which a user participating in the service exists.
- the series of session start procedures is completed as described above, and the MBMS data output from the BM-SC180 is sent to the UPE170, and the UPE170 force, the presence of the MBMS user exists. Is sent only to the eNB 120, and finally sent to the UE 100 participating in the multicast group.
- UPE 170 has already notified eNB 120 that SCT has been selected in ST303. Therefore, in ST603, UPE 170 sends a transfer mode change notification indicating switching from SCT to MCT to all eNBs 120 in the location registration area.
- the transfer mode change notification of ST603 includes an identifier indicating MCT or SCT and information indicating whether or not to perform a force, and the eNB 120 that has received the transfer mode change notification Determine whether to change the transfer mode, and determine whether to count periodically after this reception.
- Embodiment 3 even if the number of users per location registration area is less than the threshold value, when a small number of MBMS users are evenly distributed in the location registration area, By switching the transfer mode from SCT to MCT, it is possible to reduce the amount of signaling between eNBs and between eNBs and core network devices for switching the transfer mode from SCTs to MCTs without reducing the use efficiency of radio resources. it can.
- eNB distribution determination section 172 switches the transfer mode based on the ratio of the number of eNBs in which MBMS users exist to the total number of eNBs in the entire location registration area! Force S, eNB identifier and actual eNB 120 location information are set in advance, the distribution status of eNB 120 where MBMS users actually exist is judged from the notified eNB identifier, and the transfer mode is switched. May be.
- eNB distribution determination section 172 also determines the distribution power of eNB 120 in which the MBMS user exists when counting is performed based on the count results of the power count that is switching the transfer mode. In addition, you can judge the distribution of eNB120 where MBMS users exist and switch the transfer mode! /.
- the eNB 120 located at the border of the adjacent location registration area If the service is not provided, inter-cell diversity combining cannot be performed, and service reception quality may deteriorate. Therefore, in the present embodiment, the eNB 120 located at the boundary of the location registration area periodically inquires the MBMS provision status to N-eNB;! To n located at the border of the adjacent location registration area. .
- FIG. 14 is a sequence diagram showing an inquiry about the MBMS provision status between eNBs 120 located at the boundaries of different location registration areas.
- the multicast processing unit 124 of the eNB 120 positioned at the boundary of the location registration area is previously positioned at the boundary of the location registration area. And are set.
- the multicast processing unit 124 of the eNB 120 corresponds to N—e NB;! To n located at the boundary of adjacent location registration areas.
- the service inquiry is output through the output unit 125 to inquire about the MBMS provision status.
- the service inquiry includes a service identifier indicating the corresponding MBMS! /.
- the service inquiry is received N—eNBl ⁇ ! !
- the input unit 121 outputs the service identifier to the multicast processing unit 124.
- the multicast processing unit 124 determines the service provision status indicated by the service identifier, includes the result in the service response, and outputs the result to the eNB 120 that has made the service inquiry through the output unit 125.
- the input unit 121 of the eNB 120 that has received the service response receives the N—eNBl ⁇ ! !
- the MBMS provision status is output to the multicast processing unit 124.
- the multicast processing unit 124 is N—eNBl ⁇ ! ! N— eNBl ⁇ ! ! Judging.
- N-eNB;! -N which requires participation in the MBMS, is adjacent to a cell that does not provide the MBMS and has a user requesting MBMS in an adjacent location registration area.
- N— eNBl ⁇ ! ! Point to.
- the eNB 120 that has identified the above completes the participation in the MBMS by performing the processing after ST403 shown in FIG.
- the eNB 120 located at the boundary of the location registration area periodically updates the MBMS provision status to N—eNBl to n located at the border of the adjacent location registration area.
- N-eNBl ⁇ ! Located at the boundary of adjacent position registration areas. !
- the location registration area where the MCT is selected is determined to determine the necessity of participating in the MBMS.
- All MBMS users existing in the cell located at the boundary of the key are transitioned to the active state, and N-eNBl to n are allowed to participate in the MBMS by performing cell edge detection as in the second embodiment. May be.
- the timing at which UE 100 power ⁇ Measurement Report in an active state in a cell in which SCT is selected is described.
- UE 100 in an active state in a cell for which SCT is selected performs measurement of reception quality of a neighboring cell, and notifies the measurement result to eNB 200 periodically or for each event.
- the notification of the reception quality measurement result is referred to as a measurement report.
- the eNB 200 determines which edge of the cell the UE 100 is at and requests the corresponding neighboring cell to participate in the MCT mode.
- the Measurement Report is transmitted periodically or for each event regardless of whether the MBMS data is received normally, that is, whether the MBMS data is normally received. Therefore, UE100 may send an unnecessary measurement report even though MBMS data can be received normally, and may waste battery power. On the other hand, it may take time until the measurement report transmission timing even though the MBMS data loss is detected, and the reception quality may continue to be poor.
- UE 100 when UE 100 existing at a cell edge detects a data loss of MBMS, UE 100 receives a measurement report of an adjacent cell in response to a NACK transmission requesting retransmission of the missing data. It will be sent to eNB200.
- FIG. 15 is a block diagram showing a configuration of UE 100 according to Embodiment 5 of the present invention.
- the input unit 101 outputs the MBMS data packet received from the eNB 200 to the reception data determination unit 102 and the reference signal received from the adjacent cell to the reception power measurement unit 103, respectively.
- Received data determination section 102 determines whether or not the MBMS data packet output from input section 101 has been successfully received. If the packet is received correctly, the received packet is transferred to the upper layer. If the signal cannot be received correctly, that is, the received data packet When a missing data is detected, a NACK message requesting retransmission of the missing data is created, the created NACK message is transmitted to the eNB 200 through the output unit 104, and a measurement report is sent to the received power measuring unit 103 I ask you to.
- Received power measuring section 103 measures the received power for each neighboring cell using the reference signal output from input section 101, receives a request from received data determining section 102, and receives the neighbor cell.
- a measurement report including the identifier and the measurement result of the received power is transmitted to the eNB 200 through the output unit 104.
- FIG. 16 is a block diagram showing the configuration of eNB 200 according to Embodiment 5 of the present invention. However, in FIG. 16, the same reference numerals as those in FIG. 9 are given to the portions common to FIG. 9, and the detailed description thereof will be omitted.
- the input unit 201 stores the MBMS data packet received from the UPE 160 in the buffer unit 202. Also, when receiving a NACK requesting retransmission of missing MBMS data from UE 100 and a measurement report, the measurement report is output to the senor edge detection unit 203. When retransmission of the missing MBMS data packet is requested from the cumulative count comparison unit 204, the MBMS data packet stored in the buffer unit 202 is transmitted to the UE 100 again through the output unit 125.
- the cell edge detection unit 203 Based on the Measurement Report input from the input unit 201, the cell edge detection unit 203 detects which neighboring cell the UE 100 that has transmitted the Measurement Report exists in the cell edge, and detects the detected neighboring cell. Is notified to the cumulative count comparison unit 204.
- Cumulative count comparison section 204 compares the total number of users existing at the cell edge with a predetermined threshold value for each adjacent cell notified from cell edge detection section 203. Comparison result
- the neighboring cell identifier is notified to the multicast processing unit 124. If the number is less than the threshold, the MBMS data corresponding to the NACK is stored in the MBMS data packet stored in the buffer unit 202. The input unit 201 is requested to retransmit the packet.
- the operation after the cumulative count comparison unit 204 notifies the multicast processing unit 124 of the identifier of the neighboring cell is the same as the operation after ST403 in FIG. [0143]
- UE 100 existing at a cell edge detects a loss of an MBMS data packet
- UE 100 uses an NAC K transmission requesting retransmission of the missing data as a trigger for neighboring cells.
- the measurement report is sent to the eNB 200 only when necessary, and it is possible to keep UE100's battery consumption low.
- switching from SCT to MCT can improve the user's reception service quality.
- NACK requesting retransmission of a missing MBMS data packet and Measurement Report are transmitted separately.
- NACK and Measurement Report are transmitted as one message. It may be.
- the total number of users existing in the vicinity of the cell edge is compared with a predetermined threshold value.
- a predetermined threshold value was requested to switch.
- there are as many cell edges as there are neighboring cells and measurement reports are sent uniformly from users near all cell edges, and the time until the number of users near the cell edge with a particular neighboring cell reaches the threshold value. And inefficient retransmission may be repeated. Therefore, in the present embodiment, transmission of the Measuremen Report is limited to users existing near the edge with a specific neighboring cell.
- parameter selection section 132 selects a cell identifier of an adjacent cell for every predetermined period, and transmits the selected cell identifier to UE 100 through output section 125.
- the cell identifier is located near the cell edge, and specifies the UE that sends the measurement report among the UEs that detected the missing MBMS data packet. Used for.
- input section 101 notifies received power measurement section 103 of the cell identifier received from eNB 200.
- the reception data determination unit 102 that has detected the loss of the MBMS data packet requests the reception power measurement unit 103 to transmit a measurement report.
- Received power measurement section 103 determines whether or not the measurement report to be transmitted includes information on neighboring cells corresponding to the cell identifier notified from input section 101. If neighbor cell information is included, a measurement report is sent to the eNB 200. If neighbor cell information is not included, measurement report transmission is stopped.
- the subsequent threshold determination and switching operation to MCT in the eNB 200 are the same as those in the fifth embodiment, and thus detailed description thereof is omitted.
- the parameter selection unit 132 selects the cell identifier of the adjacent cell every predetermined period, but the cell edge that is expected to have poor reception quality in advance. Only the identifiers of adjacent cells may be selected in succession.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Here, it is sometimes called IC, system LSI, super LSI, or unoretra LSI depending on the difference in power integration of LSI.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general-purpose processors is also possible. You can use a field programmable gate array (FPGA) that can be programmed after manufacturing the LSI, or a reconfigurable processor that can reconfigure the connection and settings of the circuit cells inside the LSI.
- FPGA field programmable gate array
- the core network device, the radio communication base station device, and the radio communication method that are effective in the present invention can improve the utilization efficiency of radio resources of the entire network without increasing the battery consumption of the UE, It can be applied to transmission control systems that provide MBMS.
Description
Claims
Priority Applications (3)
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US12/376,960 US20100165905A1 (en) | 2006-08-25 | 2007-08-24 | Core network device, radio communication base station device, and radio communication method |
EP07792975A EP2056491A1 (en) | 2006-08-25 | 2007-08-24 | Core network device, radio communication base station device, and radio communication method |
JP2008530966A JP4926177B2 (ja) | 2006-08-25 | 2007-08-24 | コアネットワーク装置、無線通信基地局装置及び無線通信方法 |
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JP2014523213A (ja) * | 2011-07-18 | 2014-09-08 | アルカテル−ルーセント | Mceアーキテクチャにおいてmbmsサービスをカウントするための方法および装置 |
WO2013057798A1 (ja) * | 2011-10-19 | 2013-04-25 | 富士通株式会社 | 基地局、コアネットワーク装置、およびサーバ |
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EP2056491A1 (en) | 2009-05-06 |
JP4926177B2 (ja) | 2012-05-09 |
US20100165905A1 (en) | 2010-07-01 |
JPWO2008023792A1 (ja) | 2010-01-14 |
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