WO2012136023A1 - 实现多媒体广播多播业务连续性的方法、用户设备及系统 - Google Patents

实现多媒体广播多播业务连续性的方法、用户设备及系统 Download PDF

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Publication number
WO2012136023A1
WO2012136023A1 PCT/CN2011/076698 CN2011076698W WO2012136023A1 WO 2012136023 A1 WO2012136023 A1 WO 2012136023A1 CN 2011076698 W CN2011076698 W CN 2011076698W WO 2012136023 A1 WO2012136023 A1 WO 2012136023A1
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WIPO (PCT)
Prior art keywords
mbms service
target cell
cell
mbms
mbsfn area
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PCT/CN2011/076698
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English (en)
French (fr)
Inventor
许辉
马子江
李大鹏
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP11863227.2A priority Critical patent/EP2696607A4/en
Priority to US13/988,283 priority patent/US9237498B2/en
Publication of WO2012136023A1 publication Critical patent/WO2012136023A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • 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
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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

Definitions

  • the present invention relates to Multimedia Broadcast and Multicast Service (MBMS), and in particular to a method, user equipment and system for implementing multimedia broadcast multicast service continuity.
  • MBMS Multimedia Broadcast and Multicast Service
  • the 3rd Generation Partnership Project (3GPP) proposes a multimedia broadcast multicast service, which is a technology for transmitting data from one data source to multiple target user devices.
  • the sharing of resources improves the utilization of network resources (especially air interface resources).
  • the MBMS service defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, and provide a variety of rich video, audio and multimedia services, which undoubtedly conforms to the future.
  • the trend of mobile data development provides a better business prospect for the development of 3G.
  • a user equipment In a long-term evolution (LTE) system, a user equipment (UE, User Equipment) can have two working modes: a radio resource control idle (RRC Idle, idle) mode or a radio resource control connection (RRC Connected, referred to as a connection). )mode.
  • RRC Idle mode The UE mobility is implemented by cell selection or cell reselection, and the cell selection or cell reselection process is initiated by the UE. The cell reselection first considers the frequency priority, the frequency priority is provided by the system message, and the UE preferentially selects the highest priority. The frequency is used for cell reselection; the UE mobility of the connected mode is implemented by handover, and the handover procedure is initiated by an evolved node (eNB) where the source cell is located.
  • eNB evolved node
  • the MBMS service is characterized by a large amount of data in the service, a long duration of the user equipment receiving the service, and a constant average data rate. These characteristics determine that the scheduling and control signaling configuration of the MBMS service is semi-static, that is, the scheduling information and control signaling information of the MBMS service are "long-term" unchanged, and the information passes through the MBMS control channel (MCCH, MBMS). Control Channel) is sent periodically, collectively as MCCH information.
  • MCCH MBMS
  • eMBMS evolved MBMS
  • Each MCCH corresponds to a different multicast broadcast single frequency network (MBSFN).
  • MBSFN multicast broadcast single frequency network
  • the MCCH only carries the control signaling of the MBMS service corresponding to the MBSFN area. information.
  • the configuration information of the MCCH is indicated by the system message SIB13 (System Information Block), and the scheduling of the SIB13 is indicated by SIB1.
  • MBMS technology was introduced in Release 9 (R9, Release 9) of the LTE system and was enhanced in Release 10 (RIO, Release 10).
  • R9 the control signal of the MBMS service is transmitted separately from the user data, which are called Control Plane (CP) and User Plane (UP, User Plane).
  • the control plane controls the transmission of user plane data by controlling the start, update, and end of the service, and implements the basic MBMS service transmission.
  • the MBMS service is sent in the MBSFN area of fixed size (which can be statically or semi-statically configured).
  • the MBMS technology has been enhanced, mainly including: counting and priority-based preemption mechanisms.
  • LTE-A LTE Advanced
  • CA multi-carrier aggregation
  • Each UE supports aggregation of at least 2 component carriers (CC, Component Carrier abbreviation); the network side allocates a primary cell (Pcell, Primary Cell) indicating the UE and a secondary cell (Scell, Secondary Cell) of the UE; The UE camps in its own Pcell; the UE receives broadcast system information and paging messages only in the Pcell; the UE does not retrieve the public search area of the Physical Downlink Control Channel (PDCCH) in the Scell.
  • CC Component Carrier abbreviation
  • the MBMS service area (MBMSN) and the MBSFN area reserved cell are defined in the MBMS system.
  • the MBMS service area refers to the area for transmitting specific MBMS session data.
  • the MBSFN area refers to multiple cells.
  • the MBSFN area reserved cell refers to a cell that does not participate in MBSFN transmission in the MBSFN area and transmits other services with limited power on the corresponding MBSFN subframe resource. In this application, other cells outside the reserved cell in the MBSFN area are referred to as non-reserved cells.
  • the MBMS service area is dynamically configured by the Broadcast-Multicast Service Centre (BM-SC) according to the service requirements.
  • the MBSFN area is composed of Multi-cell/Multicast Coordination Entity (MCE). For static or semi-static configuration, the reserved cell is configured by the MCE. In general, the MBMS service area is larger than the MBSFN area, as shown in Figure 1.
  • the MBMS service is provided by the BM-SC, and the BM-SC sends MBMS session data to the network element in the MBMS service area, where the network element includes an MBMS gateway (MBMS-GW) and a packet data network gateway (PDN-GW).
  • the MBMS gateway sends the MBMS session data to the eNBs that join the multicast group in the multicast mode.
  • the eNBs in the same MBSFN area send the MBMS session data to the UEs in the MBSFN area through the MBSFN mode. This is called point-to-multipoint (PTM). , Point To Multipoint) transmission or MBSFN transmission.
  • PTM Point-to-multipoint
  • the PDN gateway After the PDN gateway receives the MBMS session data, if a Unicast service bearer is established, the PDN gateway will count the number of MBMS sessions. According to the sending to the Serving Gateway (S-GW), the S-GW further sends the MBMS session data to the eNB, and the eNB sends the MBMS session data to the corresponding UE, which is called a point-to-point.
  • S-GW Serving Gateway
  • PTP Point To Point
  • PSS client packet switched stream client
  • PSS server Packet-switched Streaming Service server
  • the BM-SC Before the MBMS service starts, the BM-SC first performs service advertisement.
  • the purpose of the advertisement is to send an introduction to the MBMS service to the UE.
  • the advertisement can be sent by: MBMS bearer; or interactive mode, such as a hypertext transfer protocol ( HTTP); or PTP push
  • Push mode, such as Short Message Service (SMS), Multimedia Message Service (MMS), HTTP push, etc.
  • SMS Short Message Service
  • MMS Multimedia Message Service
  • HTTP push etc.
  • the prior art is found to have the following problems: During the mobile UE receiving the MBMS service, the UE only considers the continuity of the unicast service when the cell reselects or the network side performs the handover decision. If a plurality of component carriers are deployed in the network, the UE may be reselected or switched to a target cell different from the CC in which the MBMS service is located, thereby causing the MBMS service to be interrupted and reducing the MBMS service experience of the user; in the MBMS service area, The UE that receives the MBMS service in the PTM mode moves to the non-MBSFN area or moves to the reserved cell in the MBSFN area.
  • the MBMS service is interrupted, which reduces the MBMS service experience of the user.
  • the MBMS service is received through the PTP mode.
  • the UE moves to the non-reserved cell in the MBSFN area.
  • the MBMS service is simultaneously sent through the PTP mode and the PTM mode, which causes waste of resources.
  • the main object of the present invention is to provide a method, a user equipment, and a system for implementing continuity of a multimedia broadcast multicast service, which can improve a user's MBMS service experience.
  • a method for implementing continuity of a multimedia broadcast multicast service including: when a UE is receiving or interested in receiving an MBMS service, when the UE is in an idle mode, the UE selects a target cell that is in the same frequency as the MBMS service to perform cell reselection or The UE performs the cell reselection with the MBMS frequency as the highest priority frequency; or when the UE is in the connected mode, the network side selects the target cell with the same frequency as the MBMS service to perform handover according to the MBMS reception status reported by the UE.
  • the method further includes: determining, by the UE, whether the target cell can provide the MBMS service according to the attribute of the target cell, and if yes, the UE Receiving, by the PTM mode, the MBMS service in the target cell; otherwise, the UE requests to establish a PTP connection, and receives the MBMS service in the target cell by using a PTP manner.
  • the method specifically includes:
  • the UE When the UE that receives the MBMS service in the PTM mode of the source cell moves to the target cell that cannot provide the MBMS service, the UE requests to establish a PTP connection, and continues to receive the MBMS service by using the PTP mode.
  • the method specifically includes:
  • the UE determines that the target cell is a reserved cell in the MBSFN area; or when the UE determines that the target cell is a non-reserved cell in the MBSFN area that does not have the MBMS service, and the MBSFN area and the source cell to which the target cell belongs When not, when the UE determines that the target cell belongs to a non-MBSFN area and the target cell and the source cell belong to the same MBMS service area,
  • the UE requests to establish a PTP connection, and continues to receive the MBMS service through the PTP mode.
  • the UE determines, according to an indication in the SIB13 of the target cell, whether the target cell is a reserved cell in the MBSFN area.
  • the UE is identified according to the MBSFN area in the SIB13 of the target cell. Whether the target cell and the source cell belong to the same MBSFN area are determined according to whether the MBSFN area identifier in the SIB 13 of the source cell is the same, and whether the target cell has the MBMS service is determined according to the MBMS identifier in the MCCH message in the target cell.
  • the UE determines whether the target cell belongs to the non-MBSFN area according to whether the SIB13 is in the target cell, and determines whether the target cell and the source cell belong to the same MBMS service area according to whether the target cell receives the advertisement of the MBMS service. .
  • the method specifically includes:
  • the UE that receives the MBMS service in the PTP mode of the source cell moves to the target cell that can provide the MBMS service, the UE continues to receive the MBMS service by using the PTM mode.
  • the method specifically includes:
  • the UE When the UE determines that the target cell is a non-reserved cell with the MBMS service in the MBSFN area, the UE continues to receive the MBMS service in the PTM mode according to the MBMS service configuration information in the target cell.
  • the method specifically includes:
  • the UE that receives the MBMS service in the PTM mode in the source cell moves to the target cell; wherein the target cell is a non-reserved cell in the MBSFN area that has the MBMS service, and the MBSFN area and the source cell to which the target cell belongs The UE does not continue to receive the MBMS service in the PTM mode according to the MBMS service configuration information in the target cell.
  • the method specifically includes: when a UE that receives the MBMS service by using a PTP manner in a source cell moves to a non-reserved cell in the MBSFN area that does not have the MBMS service; or
  • the UE that receives the MBMS service in the PTP mode moves to the reserved cell in the MBSFN area, the UE requests to establish a PTP connection and pass the PTP. The mode continues to receive the MBMS service.
  • the method specifically includes: when the UE that receives the MBMS service in the PTP mode moves to the cell in the non-MBSFN area, the UE requests to establish a PTP connection, and if the request is successful, the UE passes the PTP mode.
  • the MBMS service continues to be received; otherwise, the MBMS service is interrupted.
  • the method further includes: when the UE that receives the MBMS service in the PTM mode in the source cell moves to a target cell that belongs to a different MBMS service area from the source cell, the MBMS service is interrupted.
  • the method further includes: when the MBMS service is interrupted, indicating, by the access layer, a reason for the MBMS service interruption to the non-access stratum or the application layer.
  • the target cell with the same frequency as the MBMS service is selected for cell reselection, or the MBMS frequency is used as the highest priority frequency for the cell.
  • the UE when the UE is receiving or interested in receiving the MBMS service, when the UE is in the connected mode, reporting the MBMS receiving status of the UE to the network side, so that the network side selects according to the MBMS receiving status reported by the UE.
  • the target cell with the same frequency as the MBMS service is switched.
  • the UE is further configured to:
  • determining whether the target cell can provide the MBMS service according to the attribute of the target cell if yes, receiving the MBMS service by using the PTM mode in the target cell; And requesting to establish a PTP connection, and receiving, by the PTP mode, the MBMS service in the target cell.
  • the UE is further configured to: after the UE that receives the MBMS service by using the PTM mode in the source cell moves to the target cell, Determining that the target cell is a reserved cell in the MBSFN area; or determining that the target cell is a non-reserved cell in the MBSFN area without the MBMS service, and the MBSFN area to which the target cell belongs is different from the source cell; or
  • the target cell belongs to a non-MBSFN area and the target cell and the source cell belong to the same MBMS service area
  • a PTP connection is requested to be established, and the MBMS service is received by the PTP in the target cell.
  • the UE is further configured to: after the target cell is a non-reserved cell with the MBMS service in the MBSFN area, after the UE that receives the MBMS service in the PTP mode moves to the target cell, according to the target cell.
  • the MBMS service configuration information in the MBMS service continues to receive the MBMS service.
  • a system for implementing continuity of a multimedia broadcast multicast service comprising: a UE and a network side that are receiving or interested in receiving an MBMS service;
  • the UE is configured to: when the UE moves in an idle mode, select a target cell with the same frequency as the MBMS service to perform cell reselection, or use the MBMS frequency as the highest priority frequency for cell reselection; or When the UE moves, when the UE is in the connected mode, the MBMS receiving status of the UE is reported;
  • the network side is configured to: switch to a target cell with the same frequency as the MBMS service according to the MBMS receiving status reported by the UE.
  • the UE preferentially selects the target cell that is in the same frequency as the MBMS service to perform cell reselection, or the UE performs the cell with the MBMS frequency as the highest priority frequency.
  • the reselection, or the network side preferentially selects the target cell with the same frequency as the MBMS service, so as to implement the continuity of the MBMS service and improve the MBMS service experience of the user. Further, after determining that the target cell performs cell reselection or handover, if the target cell can provide the MBMS service, receive the MBMS.
  • the UE of the service continues to receive the MBMS service in the target cell by using the PTM mode; if the target cell cannot provide the MBMS service, the UE requests to establish a PTP connection, and continues to receive the MBMS service in the target cell through the PTP mode;
  • the MBMS service interruption caused by UE mobility can be avoided, and the continuity of the MBMS service can be realized, thereby improving the MBMS service experience of the user; and the MBMS service can be repeatedly transmitted on the network side, thereby improving the utilization of the radio resource.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for implementing MBMS service continuity according to the present invention
  • FIG. 3 is a flowchart of a method for implementing MBMS service continuity according to Embodiment 2 of the present invention
  • FIG. 4 is a flowchart of a method for implementing MBMS service continuity according to Embodiment 3 of the present invention
  • FIG. 6 is a flowchart of a method for implementing MBMS service continuity according to Embodiment 5 of the present invention
  • FIG. 7 is a schematic structural diagram of a system for implementing MBMS service continuity according to the present invention. detailed description
  • the present invention is mainly directed to the following application scenarios: when a UE that is receiving or interested in receiving an MBMS service moves, the UE performs cell reselection or the network side switches the UE to the target cell, and the target cell is located in the MBSFN area or the non-MBSFN area; When located in the MBSFN area, the target cell may be a reserved cell or a non-reserved cell.
  • the method for implementing MBMS service continuity of the present invention includes:
  • Step 201 When receiving or interested in receiving the UE mobile of the MBMS service, the UE preferentially selects a target cell that is in the same frequency as the MBMS service to perform cell reselection or the UE performs cell reselection using the MBMS frequency as the highest priority frequency, or the network side according to the network side Reported by the UE
  • the MBMS receiving state preferentially selects a target cell that is in the same frequency as the MBMS service to perform handover;
  • the UE that is receiving the MBMS service refers to the UE that is receiving the MBMS service through the PTM mode;
  • the UE that is interested in receiving the MBMS service refers to the UE that receives the MBMS service through the PTP mode or does not receive the MBMS service, and the UE wants to receive through the PTM mode.
  • MBMS business The MBMS business.
  • the method further comprises steps 202-205 to further implement continuity of the MBMS service.
  • Steps 202-205 after determining that the target cell performs cell reselection or handover, the UE determines, according to the attribute of the target cell, whether the target cell can provide the MBMS service; if yes, the UE receives the MBMS in the target cell by using a PTM mode. Otherwise, the UE requests to establish a PTP connection, and receives the MBMS service in the target cell through the PTP mode.
  • Determining the target cell for cell reselection or handover includes the meaning of the UE moving to the target cell.
  • the attribute of the target cell refers to whether there is an SIB13 in the target cell, whether the target cell in the SIB13 of the target cell is an reserved cell in the MBSFN area, the MBSFN area identifier in the SIB13 of the target cell, and the MCCH message in the target cell.
  • the scenario of the first embodiment is: the UE moves in the MBMS service area, and multiple component carriers are deployed in the network, and the UE has CA capability, that is, the UE in the connected mode can receive more than one component carrier at the same time, and the MBMS service is deployed on one of the component carriers.
  • the UE prepares cell reselection or the network side prepares to switch the UE.
  • the method for implementing MBMS service continuity in Embodiment 1 includes:
  • the UE receives the MBMS service on the source cell CC1, and the candidate target cell carrier frequency includes CC 1, CC2, and CC3;
  • the state that is, the network side knows that the UE is receiving the MBMS service on the CC1, and the UE may report its own MBMS reception status or report its own MBMS reception status according to the network side request; for the idle mode, the UE needs to perform cell reselection, and the UE preferentially selects
  • the carrier frequency of the MBMS service is used as the target cell for cell reselection, or the UE uses the MBMS frequency as the highest priority frequency for cell reselection.
  • the UE selects the CC1 cell as the target cell, and the UE reselects to the target cell, and continues to receive the MBMS service or listen.
  • MCCH notification message The above MBMS frequency refers to the frequency of MBMS service deployment, and may also be referred to as MBMS carrier, or MBMS frequency layer.
  • the UE autonomously sets the MBMS frequency as the highest priority, that is, does not consider the MBMS frequency priority set by the network side, and the UE performs cell reselection according to the unicast cell reselection criterion. .
  • the UE in the connection mode needs to perform handover, and the network side preferentially selects the target cell of the carrier frequency of the MBMS service to perform handover, that is, the CC1 cell is selected as the target cell, the UE enters the target cell, and continues to receive the MBMS service or listen for the MCCH notification message on the CC1;
  • the foregoing UE may also be a UE that is interested in receiving the MBMS service, that is, the UE does not receive the MBMS service or receives the MBMS service through the PTP, and the UE prepares to receive the MBMS service through the MBSFN, and the UE monitors the MCCH notification message.
  • the UE preferentially selects the cell with the same frequency as the MBMS service as the target cell when the cell is reselected or the network side is ready for handover.
  • the user's MBMS service experience can be improved.
  • the scenario in the second embodiment is: in the MBMS service area, the UE that receives the MBMS service in the PTM mode moves from one MBSFN area to another MBSFN area, as shown in scenario A in FIG. 1; or receives the MBMS service through the PTM mode.
  • UE is in the same
  • the MBSFN area i moves internally or internally, as shown in scenario B of FIG.
  • the method for implementing MBMS service continuity in the second embodiment of the present invention includes: Step 301: A UE moves from a source cell in an MBFSN area 1 to a target cell;
  • the UE may determine, by using the system message, whether the target cell is a cell in a certain MBS FN area, in which: the UE reads the SIB1 of the target cell, and if there is SIB13 related scheduling information in the SIB1, the target cell is an MBSFN area. The cell in the middle.
  • Step 302 The UE determines whether the target cell is a reserved cell, and if yes, performs step 306; otherwise, performs step 303;
  • the reserved cell refers to a cell that does not participate in MBSFN transmission and transmits other services with limited power on the corresponding MBSFN subframe resource in the MBSFN area; the reserved cell is generally located at the edge of the MBSFN area, and the purpose is to prevent other MBSFN areas and Mutual interference of Unicast services; reserved cells are configured by MCE on the network side;
  • the control unit receives the control plane information of the MBMS service, and needs to send the MCCH-related broadcast control channel (BCCH) information, that is, the SIB13, so that the SIB13 can carry the indication of the reserved cell; the UE can judge according to the indication in the SIB13 of the target cell.
  • the reserved cell does not participate in the MBSFN transmission, it can use the PTP method to send the MBMS service.
  • Step 303 the UE determines whether the target cell and the source cell belong to the same MBSFN area, and if yes, step 308 is performed; otherwise, step 304 is performed;
  • the UE reads the MBSFN Area ID in the SIB13 of the target cell, and determines whether it is the same as the MBSFN Area ID in the SIB13 of the source cell. If they are the same, the target cell and the source cell belong to the same MBSFN area; otherwise, the target cell is indicated. And the source cell belongs to a different MBSFN area i or; If the target cell and the source cell belong to the same MBSFN area, it corresponds to scenario B in FIG. 1; if the target cell and the source cell belong to different MBSFN areas, it corresponds to scenario A in FIG.
  • Step 304 the UE determines whether the target cell has the MBMS service required by the UE, and if yes, step 305 is performed; otherwise, step 306 is performed;
  • the UE reads the MCCH message in the target cell, and determines whether the target cell has the MBMS service required by the UE according to the MBMS service identifier in the MCCH message, if the MBMS service identifier in the MCCH message in the target cell and the MBMS service that the UE is receiving. If the identifiers are the same, the target cell has the MBMS service required by the UE;
  • the MBMS service identifier is a temporary mobile group identifier (TMGI, Temporary Mobile)
  • Step 305 The UE continues to receive the required MBMS service in the target cell by using the PTM mode according to the MBMS service configuration information in the target cell, and the current processing process ends.
  • the configuration information of the same MBMS service in different cells is generally different. Therefore, after entering the target cell, the UE needs to re-read the MBMS service in the target cell. Configuring information, and receiving corresponding MBMS services according to the configuration information;
  • the MBMS service configuration information includes at least: an SIB 13, an MCCH message, a multicast channel scheduling information (MSI, MCH Scheduling Information), and the like.
  • Step 306 The UE requests to establish a PTP connection, and is configured to receive the required
  • the request is a request that the UE enters the target cell and is initiated in the target cell; the request may be an access layer (AS, Access Stratum) message or a non-access stratum (NAS, Non-Access Stratum) message;
  • AS refers to a request message sent by the UE to the eNB where the target cell is located;
  • NAS message refers to the mobile management to which the UE belongs to the target cell.
  • a request message sent by the MME (Mobility Management Entity); the request may be initiated by the UE through the PSS client;
  • the request includes at least one of the following information: an MBMS service identifier (ID), an MBMS session start time, and a PDN-GW to which the UE belongs;
  • ID an MBMS service identifier
  • PDN-GW a PDN-GW to which the UE belongs
  • the network side After the request reaches the network side, the network side establishes a PTP bearer for the UE;
  • the UE is an idle mode or a connected mode UE, and the idle mode UE needs to establish an RRC connection with the network side.
  • Step 307 The UE continues to receive the required MBMS service in the target cell by using the PTP mode; the current processing procedure ends.
  • Step 308 The UE continues to receive the required MBMS service in the target cell by using the PTM mode; the current processing procedure ends;
  • the source cell and the target cell belong to the same MBSFN area, so the UE can continue to receive the MBMS service in the target cell.
  • the UE can continue to receive the MBMS service, thereby implementing the continuity of the suspended MBMS service.
  • the scenario in the third embodiment is: In the MBMS service area, the UE that receives the MBMS service through the PTM moves from the MBSFN area to the non-MBSFN area, as shown in scenario C of FIG.
  • the method for implementing the MBMS service continuity in the third embodiment of the present invention includes: Step 401: The UE moves to a target cell, where the target cell belongs to a non-MBSFN area; and the non-MBSFN area refers to a cell in the area.
  • the system message SIB 13 is not transmitted; if the UE does not find the SIB13 of the target cell, it indicates that the target cell is a cell in the non-MBSFN area.
  • Step 402 the UE determines whether the target cell and the source cell belong to the same MBMS service area, and if so, step 403 is performed, otherwise, step 405 is performed;
  • the BM-SC sends an announcement in the MBMS service area, which is used to introduce the content of the MBMS service, the start time of the MBMS service, and the like;
  • the UE may determine, according to the advertisement, whether the target cell and the source cell belong to the same MBMS service area; for example, if the UE can receive the advertisement of the required MBMS service in the target cell, the target cell and the source cell belong to the same MBMS service area;
  • the eNB is aware of the MBMS service area to which the eNB belongs.
  • the eNB of the source cell can exchange the MBMS service area information with the eNB of the target cell through the X2 interface. According to the exchanged MBMS service area information, the eNB of the source cell can switch the UE to the same service MBMS area.
  • Step 403 The UE requests to establish a PTP connection, and is used to receive the required MBMS service by using the PTP mode; that is, the UE sends a request message to the network side, requesting the network side to send the required MBMS service by using the PTP mode;
  • Step 403 is the same as step 306, and details are not described herein again.
  • Step 404 The UE continues to receive the required MBMS service in the target cell by using the PTP mode; the current processing procedure ends.
  • Step 405 The UE enters the target cell, and the MBMS service is interrupted.
  • the message may be sent to the NAS layer or the application layer through the AS layer to indicate that the MBMS service is interrupted.
  • the UE leaves the MBMS service area, which improves the MBMS service experience of the user.
  • the scenario in the fourth embodiment is as follows: In the MBMS service area, the UE that receives the MBMS service through the PTP mode moves from the non-MBSFN area to the MBSFN area, as shown in FIG.
  • the method for implementing MBMS service continuity in Embodiment 4 of the present invention includes: Step 501: The UE moves from a source cell in a non-MBSFN area to a target cell in an MBSFN area.
  • the UE may determine, by using the system message, whether the target cell is a cell in a certain MBS FN area, in which: the UE reads the SIB1 of the target cell, and if there is SIB13 related scheduling information in the SIB1, the target cell is an MBSFN area. The cell in the middle.
  • Step 502 The UE determines whether the target cell is a reserved cell, and if yes, performs step 505; otherwise, performs step 503;
  • Step 502 is the same as step 302, and details are not described herein again.
  • Step 503 The UE determines whether the target cell has an MBMS service required by the UE. If yes, step 504 is performed; otherwise, step 505 is performed.
  • Step 503 is the same as step 304, and details are not described herein again.
  • Step 504 The UE continues to receive the required MBMS service in the target cell by using the PTM mode according to the MBMS service configuration information in the target cell; the current processing procedure ends;
  • Step 504 further includes: releasing, by the UE, a PTP connection with the source cell;
  • the UE that receives the MBMS service in the target cell may be in an idle mode or a connected mode; the MBMS service configuration information includes at least: an SIB13, an MCCH message, an MSI, and the like.
  • Step 505 The UE requests to establish a PTP connection, and is configured to receive the required MBMS service by using a PTP manner.
  • the establishing a PTP connection means: releasing a PTP connection with the source cell, and reestablishing a PTP connection in the target cell;
  • Step 506 The process of establishing a PTP connection in the target cell is as described in step 306, and details are not described herein again.
  • Step 506 The UE continues to receive the required MBMS service in the target cell by using the PTP mode; the current processing procedure ends;
  • the UE receives the MBMS service through the re-established PTP connection in the target cell.
  • Embodiment 5 The scenario in the fifth embodiment is as follows: In the MBMS service area, the UE that receives the MBMS service in the PTP mode moves from one cell in the non-MBSFN area to one cell in a non-MBSFN area, as shown in scenario E of FIG.
  • the method for implementing MBMS service continuity in Embodiment 5 of the present invention includes: Step 601: A UE moves to a target cell in a non-MBSFN area;
  • the UE does not find the SIB13 of the target cell, it indicates that the target cell is a cell in the non-MBSFN area.
  • Step 602 The UE requests to establish a PTP connection in the target cell, and is used to receive the required MBMS service by using the PTP mode. If the request is successful, step 603 is performed; otherwise, step 604 is performed;
  • the request failure refers to: the RRC connection request fails due to random access failure or other reasons;
  • the UE may repeatedly initiate the request, so this step may be performed multiple times.
  • Step 603 The UE continues to receive the required MBMS service in the target cell by using the PTP mode; the current processing procedure ends.
  • Step 604 The UE enters the target cell, and the required MBMS service is interrupted.
  • the message may be sent to the NAS layer or the application layer through the AS layer to indicate that the MBMS service is interrupted.
  • the UE leaves the MBMS service area, which improves the MBMS service experience of the user.
  • the present invention provides a UE that implements MBMS service continuity, where the UE is used to: when the UE is in the idle mode when receiving or moving the UE that is interested in receiving the MBMS service, Selecting a target cell with the same frequency as the MBMS service for cell reselection, or performing MBC frequency as the highest priority frequency for cell reselection; Or for: when the UE is receiving or interested in receiving the MBMS service, when the UE is in the connected mode, reporting the MBMS receiving status of the UE to the network side, so that the network side selects according to the MBMS receiving status reported by the UE.
  • the target cell with the same frequency as the MBMS service is switched.
  • the UE is also used to:
  • determining whether the target cell can provide the MBMS service according to the attribute of the target cell if yes, receiving the MBMS service by using the PTM mode in the target cell; And requesting to establish a PTP connection, and receiving, by the PTP mode, the MBMS service in the target cell.
  • the UE is further configured to: after the UE that receives the MBMS service by using the PTM mode in the source cell moves to the target cell,
  • the target cell is a non-reserved cell in the MBSFN area that does not have the MBMS service, and the MBSFN area to which the target cell belongs is different from the source cell;
  • the target cell belongs to a non-MBSFN area and the target cell and the source cell belong to the same MBMS service area
  • a PTP connection is requested to be established, and the MBMS service is received by the PTP in the target cell.
  • the UE is further configured to: after the target cell is a non-reserved cell with the MBMS service in the MBSFN area, after the UE that receives the MBMS service in the PTP mode moves to the target cell, according to the target cell.
  • the MBMS service configuration information in the MBMS service continues to receive the MBMS service.
  • the UE includes:
  • the reselection module 10 is configured to select, when the UE is in the idle mode, when the UE is in the idle mode, when the UE is in the idle mode, select the same frequency as the MBMS service.
  • the target cell performs cell reselection, or the MBMS frequency is used as the highest priority frequency for cell reselection;
  • the reporting module 20 is configured to report, when the UE is in the connected mode, the MBMS receiving state of the UE is reported to the network side, so that the network side receives the MBMS received according to the UE, when the UE is in the connected mode.
  • the state selection is switched with the target cell of the same frequency as the MBMS service.
  • the UE further includes: a determining module 30, configured to determine, according to an attribute of the target cell, whether the target cell can provide the MBMS service; if yes, triggering the first receiving module 40; otherwise, triggering the second receiving module 50;
  • a first receiving module 40 configured to receive, by using a PTM manner, the MBMS service in the target cell
  • the second receiving module 50 is configured to request to establish a PTP connection, and receive the MBMS service in the target cell by using a PTP manner.
  • the determining module 30 is further configured to: after the UE that receives the MBMS service in the PTM mode in the source cell moves to the target cell,
  • the target cell is a non-reserved cell in the MBSFN area that does not have the MBMS service, and the MBSFN area to which the target cell belongs is different from the source cell;
  • the target cell belongs to a non-MBSFN area and the target cell and the source cell belong to the same MBMS service area
  • the second receiving module 50 is triggered.
  • the determining module 30 is further configured to: after the UE that receives the MBMS service in the PTP mode moves to the target cell, and determines that the target cell is a non-reserved cell with the MBMS service in the MBSFN area, triggering The first receiving module 40 continues to receive the PTM mode according to the MBMS service configuration information in the target cell. MBMS business.
  • the present invention provides a system for implementing MBMS service continuity, and the system includes: a UE and a network side that are receiving or interested in receiving an MBMS service;
  • the UE is configured to: when the UE moves in an idle mode, select a target cell with the same frequency as the MBMS service to perform cell reselection, or use the MBMS frequency as the highest priority frequency for cell reselection; or When the UE moves, when the UE is in the connected mode, the MBMS receiving status of the UE is reported;
  • the network side is configured to: switch to a target cell with the same frequency as the MBMS service according to the MBMS receiving status reported by the UE.
  • the network side includes: a switching module 100, configured to select, according to an MBMS receiving status reported by the reporting module 20, a target cell that is in the same frequency as the MBMS service to perform handover.
  • the UE and the system for implementing MBMS continuity are designed to implement the foregoing method for implementing MBMS continuity. Therefore, the implementation functions of the foregoing modules may refer to the related description of the foregoing method, and Let me repeat.

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Abstract

本发明公开了一种实现多媒体广播多播业务连续性的方法、用户设备及系统。所述方法包括：正在接收或者感兴趣接收MBMS业务的UE移动时，当UE处于空闲模式时，UE选择与MBMS业务同频的目标小区进行小区重选或者UE将MBMS频率作为最高优先级频率进行小区重选；或者当UE处于连接模式时，网络侧根据UE上报的MBMS接收状态选择与MBMS业务同频的目标小区进行切换。采用本发明能够提高用户的MBMS业务体验。

Description

实现多媒体广播多播业务连续性的方法、 用户设备及系统 技术领域
本发明涉及多媒体广播多播业务（MBMS , Multimedia Broadcast and Multicast Service ), 尤其涉及一种实现多媒体广播多播业务连续性的方法、 用户设备及系统。 背景技术
随着互联网的迅速发展和大屏幕多功能用户设备的普及， 出现了大量 移动数据多媒体业务和各种高带宽多媒体业务， 如视频会议、 电视广播、 视频点播、 广告、 网上教育、 互动游戏等， 这些业务既满足了移动用户多 业务的需求， 也为移动运营商带来了新的业务增长点。 这些移动数据多媒 体业务要求多个用户能够同时接收相同数据， 与一般的数据业务相比， 具 有数据量大、 持续时间长、 时延敏感等特点。
为了有效利用移动网络资源， 第三代合作伙伴计划 （3GPP , 3rd Generation Partnership Project )提出了多媒体广播多播业务， 该业务是一种 从一个数据源向多个目标用户设备传送数据的技术， 实现了网络（包括核 心网和接入网） 资源的共享， 提高了网络资源 （尤其是空中接口资源） 的 利用率。 3GPP定义的 MBMS业务不仅能够实现纯文本低速率的消息类组 播和广播， 而且还能够实现高速多媒体业务的广播和组播， 提供多种丰富 的视频、 音频和多媒体业务， 这无疑顺应了未来移动数据发展的趋势， 为 3G的发展提供了更好的业务前景。
长期演进（LTE, Long Time Evolution ) 系统中， 用户设备（UE, User Equipment )可以有两种工作模式： 无线资源控制空闲 （ RRC Idle, 简称空 闲）模式或无线资源控制连接（RRC Connected, 简称连接）模式。 空闲模 式的 UE移动性釆用小区选择或小区重选实现，小区选择或小区重选过程由 UE发起，小区重选首先考虑频率的优先级，频率优先级通过系统消息提供， UE优先选择优先级最高的频率进行小区重选； 连接模式的 UE移动性釆用 切换实现， 切换过程由源小区所在的演进型节点 （eNB )发起。
MBMS业务的特点是业务的数据量大、 用户设备接收业务时持续时间 长、 平均数据率恒定。 这些特点决定了 MBMS业务的调度与控制信令配置 都是半静态的， 即 MBMS业务的调度信息与控制信令信息都是 "长期" 保 持不变的，这些信息通过 MBMS控制信道（ MCCH, MBMS Control Channel ) 周期性地发送， 统称为 MCCH信息。 演进型 MBMS ( eMBMS ) 系统可能 存在多个 MCCH, 每个 MCCH对应于不同的组播广播单频网 （MBSFN, Multicast Broadcast Single Frequency Network ), MCCH仅 载对应 MBSFN 区域发送的 MBMS业务的控制信令信息。 MCCH的配置信息通过系统消息 SIB13 ( System Information Block, 系统信息块）指示， SIB13的调度通过 SIB1指示。
在 LTE系统的版本 9 ( R9 , Release 9 ) 中引入了 MBMS技术， 并在版 本 10 ( RIO, Release 10 ) 中进行了加强。 在 R9中， MBMS业务的控制信 令与用户数据分开传输，分别称为控制面（ CP , Control Plane )和用户面（ UP , User Plane )。控制面通过控制业务的开始、 更新和结束， 来控制用户面数据 的发送， 实现基本的 MBMS业务的发送。 MBMS业务在固定大小（可以静 态或半静态配置）的 MBSFN区域中发送。在 R10版本中，为了提高 MBMS 系统的资源利用率， 方便运营商管理， 对 MBMS技术进行了增强， 主要包 括： 计数和基于优先级的抢占机制。
在 LTE-A ( LTE Advanced ) 中， 引入了多载波聚合 （CA, Carrier Aggregation )技术， 即一个位置存在多个不同频率 （段） 的载波， 这些载 波频率之间可以连续的或离散的， 网络侧同时使用两个或两个以上的载波 为一个 UE发送数据。 具有 CA能力的连接模式的 UE可以同时在两个或者 两个以上的载波上接收数据。 每个 UE 至少支持 2 个分量载波（CC , Component Carrier简称）的聚合；网络侧为 UE分配指示 UE的主小区（ Pcell, Primary Cell )和 UE的辅小区 （ Scell, Secondary Cell ) ； 空闲状态的 UE 驻留在自己的 Pcell 中； UE仅在 Pcell 中接收广播系统信息和寻呼消息 ( Paging message )； UE不在 Scell中检索物理下行控制信道 ( PDCCH )的 公共检索区域。
在 MBMS 系统中定义了 MBMS 业务区域（ MBMS Service Area )、 MBSFN区域和 MBSFN区域保留小区； 其中， MBMS业务区域是指发送特 定的 MBMS会话（session )数据的区域； MBSFN区域是指由多个小区组 成的、协同完成 MBSFN传输的区域； MBSFN区域保留小区是指在 MBSFN 区域内， 不参与 MBSFN传输，在相应的 MBSFN子帧资源上以有限的功率 发送其他业务的小区。本申请中将 MBSFN区域内保留小区之外的其他小区 称为非保留小区。 MBMS 业务区域是由广播多播业务中心 （BM-SC , Broadcast-Multicast Service Centre )根据业务需求动态配置的， MBSFN区 域是由多小区 /多播协作实体（ MCE, Multi-cell/multicast Coordination Entity ) 静态或半静态配置的， 保留小区是由 MCE配置的。 一般来说， MBMS业 务区域大于 MBSFN区域， 如图 1所示。
MBMS业务由 BM-SC提供， BM-SC向 MBMS业务区域内的网元发送 MBMS会话数据， 所述网元包括 MBMS网关（ MBMS-GW )和分组数据网 网关 （PDN-GW )。 MBMS 网关通过多播方式向加入多播组的 eNB 发送 MBMS会话数据， 位于同一个 MBSFN区域内的 eNB通过 MBSFN方式向 该 MBSFN区域内的 UE发送 MBMS会话数据， 这称为点到多点 （ PTM , Point To Multipoint )传输或 MBSFN传输。 PDN网关收到 MBMS会话数据 后， 如果建立了单播（Unicast )业务承载， 则 PDN网关将 MBMS会话数 据发送到服务网关 （S-GW, Serving Gateway ), S-GW进一步发送 MBMS 会话数据到 eNB , eNB发送 MBMS会话数据到相应的 UE , 这称为点到点
( PTP, Point To Point )传输。 上述传输过程说明： 在 MBMS业务区域内， UE可以通过 PTP方式或者 PTM方式接收 MBMS业务。 对于 PTP方式， 一般由 UE向分组交换流业务服务器（ PSS server, Packet-switched Streaming Service server )发起分组交换流客户端 （ PSS client )请求。
在 MBMS业务开始之前（ session start ), BM-SC先进行业务通告， 通 告的目的是向 UE发送 MBMS业务的简介， 通告可以通过以下方式发送： MBMS承载； 或者交互方式， 如超文本传输协议（ HTTP ); 或者 PTP push
(推）方式， 如短消息服务 ( SMS , Short Message Service )、 多媒体消息服 务（MMS, Multimedia Message Service ), HTTP push等。
在对现有技术的研究和实践过程中发现现有技术存在以下问题： 正在 接收 MBMS业务的 UE在移动过程中 , UE在小区重选或者网络侧在切换 判决时只考虑单播业务的连续性， 如果网络中部署了多个分量载波， 则 UE 可能小区重选或被切换到与 MBMS业务所在 CC不同的目标小区， 从而导 致 MBMS业务中断，降低用户的 MBMS业务体验；在 MBMS业务区域内 , 通过 PTM方式接收 MBMS业务的 UE移动到非 MBSFN区域或者移动到 MBSFN区域中的保留小区 , 此时 MBMS业务中断 , 降低了用户的 MBMS 业务体验； 在 MBMS业务区域内， 通过 PTP方式接收 MBMS业务的 UE 移动到 MBSFN区域内的非保留小区，此时 MBMS业务同时通过 PTP方式 和 PTM方式发送， 造成了资源的浪费。 发明内容
有鉴于此， 本发明的主要目的在于提供一种实现多媒体广播多播业务 连续性的方法、 用户设备及系统， 能够提高用户的 MBMS业务体验。
为达到上述目的， 本发明的技术方案是这样实现的： 一种实现多媒体广播多播业务连续性的方法， 包括： 正在接收或者感 兴趣接收 MBMS业务的 UE移动时， 当 UE处于空闲模式时， UE选择与 MBMS业务同频的目标小区进行小区重选或者 UE将 MBMS频率作为最高 优先级频率进行小区重选； 或者当 UE处于连接模式时， 网络侧根据 UE上 报的 MBMS接收状态选择与 MBMS业务同频的目标小区进行切换。
进一步地， 在确定了目标小区进行小区重选或切换后， 所述方法还包 括： 所述 UE根据所述目标小区的属性判断目标小区能否提供所述 MBMS 业务， 如果能， 则所述 UE在所述目标小区通过 PTM方式接收所述 MBMS 业务； 否则， 所述 UE请求建立 PTP连接， 并在所述目标小区通过 PTP方 式接收所述 MBMS业务。
进一步地， 所述方法具体包括：
当在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到不能 提供所述 MBMS业务的目标小区时， 所述 UE请求建立 PTP连接， 并通 过 PTP方式继续接收所述 MBMS业务。
进一步地， 所述方法具体包括：
当 UE确定所述目标小区为 MBSFN区域中的保留小区时； 或 当 UE确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务 的非保留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或 当 UE确定所述目标小区属于非 MBSFN区域且所述目标小区与源 小区属于相同的 MBMS业务区域时，
所述 UE请求建立 PTP连接，并通过 PTP方式继续接收所述 MBMS 业务。
进一步地， 所述 UE根据目标小区的 SIB13中的指示判断所述目标 小区是否为 MBSFN区域中的保留小区。
进一步地， 所述 UE根据目标小区的 SIB13 中的 MBSFN区域标识 与源小区的 SIB 13中的 MBSFN区域标识是否相同判断目标小区和源小 区是否属于相同的 MBSFN区域， 并根据目标小区中的 MCCH消息中的 MBMS标识判断目标小区是否有所述 MBMS业务。
进一步地， 所述 UE根据目标小区中是否有 SIB13判断目标小区是 否属于非 MBSFN区域， 并根据自身在目标小区是否收到所述 MBMS业 务的通告判断目标小区与源小区是否属于相同的 MBMS业务区域。
进一步地， 所述方法具体包括：
当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到能提供 所述 MBMS业务的目标小区时， 所述 UE通过 PTM方式继续接收所述 MBMS业务。
进一步地， 所述方法具体包括：
当 UE确定所述目标小区为 MBSFN区域中的有所述 MBMS业务的 非保留小区时， 所述 UE根据目标小区中的 MBMS 业务配置信息通过 PTM方式继续接收所述 MBMS业务。
进一步地， 所述方法具体包括：
当在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到目标 小区； 其中， 所述目标小区为 MBSFN区域中的有所述 MBMS业务的非 保留小区， 且目标小区所属的 MBSFN区域与源小区的不同时， 所述 UE 根据目标小区中的 MBMS 业务配置信息通过 PTM 方式继续接收所述 MBMS业务。
进一步地， 所述方法具体包括： 当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到 MBSFN区域中的没有所述 MBMS业务的非保 留小区时； 或
当在所述源小区通过 PTP方式接收所述 MBMS业务的 UE移动到 MBSFN区域中的保留小区时，所述 UE请求建立 PTP连接，并通过 PTP 方式继续接收所述 MBMS业务。
进一步地， 所述方法具体包括： 当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到非 MBSFN区域中的小区时， 所述 UE请求建 立 PTP连接， 如果请求成功， 则 UE通过 PTP方式继续接收所述 MBMS 业务； 否则， 所述 MBMS业务中断。
进一步地， 所述方法还包括： 当在源小区通过 PTM 方式接收所述 MBMS业务的 UE移动到与源小区属于不同的 MBMS业务区域的目标小 区时， 所述 MBMS业务中断。
进一步地， 所述方法还包括： 当所述 MBMS业务中断时， 通过接入 层向非接入层或应用层指示所述 MBMS业务中断的原因。
一种实现多媒体广播多播业务连续性的 UE, 用于：
在正在接收或者感兴趣接收 MBMS业务的所述 UE移动时， 当所述 UE处于空闲模式时，选择与 MBMS业务同频的目标小区进行小区重选， 或者将 MBMS频率作为最高优先级频率进行小区重选；
或者用于： 在正在接收或者感兴趣接收 MBMS业务的所述 UE移动 时， 当所述 UE处于连接模式时， 向网络侧上报 UE的 MBMS接收状态， 使网络侧根据 UE上报的 MBMS接收状态选择与 MBMS业务同频的目 标小区进行切换。
进一步地， 所述 UE还用于：
在确定了目标小区进行小区重选或切换后， 根据所述目标小区的属 性判断目标小区能否提供所述 MBMS业务； 如果能， 则在所述目标小区 通过 PTM方式接收所述 MBMS业务； 否则， 请求建立 PTP连接， 并在 所述目标小区通过 PTP方式接收所述 MBMS业务。
所述 UE进一步用于： 在源小区通过 PTM方式接收所述 MBMS业 务的 UE移动到目标小区后， 确定所述目标小区为 MBSFN区域中的保留小区时； 或 确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务的非保 留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或
确定所述目标小区属于非 MBSFN 区域且所述目标小区与源小区属 于相同的 MBMS业务区域时，
请求建立 PTP 连接， 并在所述目标小区通过 PTP 方式接收所述 MBMS业务。
所述 UE进一步用于：在源小区通过 PTP方式接收所述 MBMS业务 的 UE移动到目标小区后， 确定所述目标小区为 MBSFN区域中的有所 述 MBMS业务的非保留小区时， 根据目标小区中的 MBMS业务配置信 息通过 PTM方式继续接收所述 MBMS业务。
一种实现多媒体广播多播业务连续性的系统， 包括： 正在接收或者 感兴趣接收 MBMS业务的 UE和网络侧； 其中，
UE用于：在 UE移动时，当所述 UE处于空闲模式时，选择与 MBMS 业务同频的目标小区进行小区重选，或者将 MBMS频率作为最高优先级 频率进行小区重选； 或用于在 UE移动时， 当所述 UE处于连接模式时， 上报 UE的 MBMS接收状态；
网络侧用于：根据 UE上报的 MBMS接收状态选择与 MBMS业务同频 的目标小区进行切换。
由以上技术方案可以看出， 正在接收或感兴趣接收 MBMS业务的 UE 在移动时， UE优先选择与 MBMS业务同频的目标小区进行小区重选， 或 者 UE将 MBMS频率作为最高优先级频率进行小区重选， 或者网络侧优先 选择与 MBMS业务同频的目标小区进行切换， 从而实现 MBMS业务的连 续性， 提高用户的 MBMS业务体验。 进一步地， 在确定了目标小区进行小 区重选或切换后， 如果目标小区能提供所述 MBMS 业务， 则接收 MBMS 业务的 UE在目标小区通过 PTM方式继续接收所述 MBMS业务；如果目标 小区不能提供所述 MBMS业务， 则 UE请求建立 PTP连接， 并在目标小区 通过 PTP方式继续接收所述 MBMS业务； 因此本发明能够避免因 UE移动 造成的 MBMS 业务中断， 实现 MBMS 业务的连续性， 从而提高用户的 MBMS业务体验； 并且能够避免网络侧重复发送 MBMS业务，从而提高无 线资源的利用率。 附图说明
图 1为本发明实施例应用场景的示意图；
图 2为本发明实现 MBMS业务连续性的方法的流程图；
图 3为本发明实施例二的实现 MBMS业务连续性的方法的流程图； 图 4为本发明实施例三的实现 MBMS业务连续性的方法的流程图； 图 5为本发明实施例四的实现 MBMS业务连续性的方法的流程图； 图 6为本发明实施例五的实现 MBMS业务连续性的方法的流程图； 图 7为本发明实现 MBMS业务连续性的系统的结构示意图。 具体实施方式
本发明主要针对以下应用场景：正在接收或感兴趣接收 MBMS业务 的 UE在移动时， UE进行小区重选或网络侧将 UE切换到目标小区， 目 标小区位于 MBSFN 区域或非 MBSFN 区域； 当目标小区位于 MBSFN 区域时， 目标小区可以是保留小区或非保留小区。
如图 2所示， 本发明实现 MBMS业务连续性的方法包括：
步骤 201 , 正在接收或感兴趣接收 MBMS业务的 UE移动时， UE 优先选择与 MBMS业务同频的目标小区进行小区重选或者 UE将 MBMS 频率作为最高优先级频率进行小区重选， 或者网络侧根据 UE 上报的
MBMS接收状态优先选择与 MBMS业务同频的目标小区进行切换； 其中， 正在接收 MBMS 业务的 UE是指正在通过 PTM 方式接收 MBMS业务的 UE; 感兴趣接收 MBMS业务的 UE是指通过 PTP方式接 收 MBMS业务或没有接收 MBMS业务的 UE, 并且 UE希望通过 PTM 方式接收 MBMS业务。
优选地， 所述方法还包括步骤 202-205 , 以进一步实现 MBMS业务 的连续性。
步骤 202-205 , 在确定了目标小区进行小区重选或切换后， UE根据 目标小区的属性判断目标小区能否提供所述 MBMS 业务； 如果能， 则 UE在目标小区通过 PTM方式接收所述 MBMS业务； 否则， UE请求建 立 PTP连接， 并在目标小区通过 PTP方式接收所述 MBMS业务。
"确定了目标小区进行小区重选或切换" 包含了 UE移动到目标小 区的含义。
其中， 目标小区的属性指目标小区中是否有 SIB13 , 目标小区的 SIB13 中的目标小区是否为 MBSFN 区域中的保留小区的指示， 目标小 区的 SIB13 中的 MBSFN 区域标识、 目标小区中的 MCCH 消息中的 MBMS业务标识等内容， 这些内容将在下文详细描述。 实施例一
实施例一的场景是： UE在 MBMS业务区域内移动， 网络中部署了多 个分量载波， UE具有 CA能力， 即连接模式的 UE可以同时接收一个以上 分量载波， MBMS业务部署在其中一个分量载波上， UE准备小区重选或者 网络侧准备对 UE进行切换。
实施例一的实现 MBMS业务连续性的方法包括：
假设 MBMS业务部署在 CC1 , UE在源小区 CC1上接收 MBMS业务， 候选目标小区载频包括 CC 1、 CC2、 CC3； 网络侧已知 UE的 MBMS接收 状态， 即网络侧已知 UE正在 CC1上接收 MBMS业务， UE可以主动上报 自身的 MBMS接收状态或者根据网络侧请求上报自身的 MBMS接收状态； 对于空闲模式的 UE需要进行小区重选， UE优先选择 MBMS业务所 在载频作为目标小区进行小区重选， 或者 UE将 MBMS频率作为小区重选 的最高优先级频率， 因此 UE选择 CC1小区作为目标小区， UE重选到目标 小区 , 继续接收 MBMS业务或者监听 MCCH通知消息； 上述 MBMS频率 是指 MBMS业务部署的频率，也可以称为 MBMS载波，或 MBMS频率层。
需要指出的是： UE在进行小区重选过程中， 自主将 MBMS频率作为 最高优先级， 即不考虑网络侧设置的 MBMS频率优先级， 并且 UE进行小 区重选需要按照单播小区重选准则进行。
对于连接模式的 UE需要进行切换， 网络侧优先选择 MBMS业务所在 载频的目标小区进行切换， 即选择 CC1 小区作为目标小区， UE进入目标 小区， 在 CC1上继续接收 MBMS业务或监听 MCCH通知消息；
需要指出的是： 上述 UE也可以是感兴趣接收 MBMS业务的 UE, 即 UE没有接收 MBMS业务或者通过 PTP接收 MBMS业务， UE准备通 过 MBSFN接收 MBMS业务， UE监听 MCCH通知消息。 对于感兴趣接 收 MBMS业务的 UE, UE在小区重选或网络侧在切换准备时， 优先选 择与 MBMS业务同频的小区作为目标小区。
对于没有接收 MBMS业务的 UE, 如果在 UE小区重选或网络侧切 换小区时，一开始就选择与想要接收的 MBMS业务同频的小区作为目标 小区， 则可以提高用户的 MBMS业务的体验。
实施例二
实施例二针对的场景是： 在 MBMS业务区域内， 通过 PTM方式接 收 MBMS业务的 UE从一个 MBSFN区域移动到另一个 MBSFN区域， 如图 1所示的场景 A; 或通过 PTM方式接收 MBMS业务的 UE在同一 个 MBSFN区 i或内移动， 如图 1所示的场景 B。
如图 3所示，本发明实施例二的实现 MBMS业务连续性的方法包括： 步骤 301 , UE从 MBFSN区域 1中的源小区移动到一个目标小区；
UE可以通过系统消息判断目标小区是否为某一个 M B S FN区域中的 小区， 具体方式为： UE读取目标小区的 SIB1 , 如果 SIB1 中有 SIB13 相关的调度信息， 则说明目标小区为某一个 MBSFN区域中的小区。
步骤 302 , UE判断目标小区是否为保留小区， 如果是， 则执行步骤 306; 否则， 执行步骤 303 ;
所述保留小区是指在 MBSFN区域内， 不参与 MBSFN传输， 在相 应的 MBSFN子帧资源上以有限的功率发送其他业务的小区； 保留小区 一般位于 MBSFN区域的边缘， 目的是防止其他 MBSFN区域和 Unicast 业务的相互干扰； 保留小区由网络侧的 MCE配置；
保留小区接收 MBMS业务的控制面信息， 并需要发送 MCCH相关 的广播控制信道（BCCH )信息， 即 SIB13 , 因此可以在 SIB13中携带保 留小区的指示； UE可以根据目标小区的 SIB13 中的指示来判断目标小 区是否为保留小区； 具体地， 可以釆用一个比特 R指示， 如 R=l说明该 小区为保留小区； R=0说明该小区为非保留小区；
保留小区虽然不参与 MBSFN 传输， 但可以釆用 PTP 方式发送 MBMS业务。
步骤 303 , UE判断目标小区和源小区是否属于相同的 MBSFN区域， 如果是， 则执行步骤 308; 否则， 执行步骤 304;
UE读取目标小区的 SIB13中的 MBSFN Area ID , 并判断其与源小 区的 SIB13中的 MBSFN Area ID是否相同， 如果相同， 则说明目标小区 和源小区属于相同的 MBSFN区域； 否则， 说明目标小区和源小区属于 不同的 MBSFN区 i或； 如果目标小区和源小区属于相同的 MBSFN区域 , 则对应图 1 中的 场景 B; 如果目标小区和源小区属于不同的 MBSFN 区域， 则对应图 1 中的场景 A。
步骤 304 , UE判断目标小区是否有 UE所需的 MBMS业务， 如果 是， 则执行步骤 305 ; 否则， 执行步骤 306;
UE读取目标小区中的 MCCH消息 , 根据 MCCH消息中的 MBMS 业务标识判断目标小区是否有 UE所需的 MBMS业务， 如果目标小区中 的 MCCH消息中的 MBMS业务标识与 UE正在接收的 MBMS业务的标 识相同， 则说明目标小区有 UE所需的 MBMS业务；
所述 MBMS业务标识为临时移动组标识（ TMGI, Temporary Mobile
Group Identity ) 。
步骤 305 , UE根据目标小区中的 MBMS业务配置信息在目标小区 通过 PTM方式继续接收所需的 MBMS业务， 当前处理流程结束；
如果目标小区和源小区属于不同的 MBSFN 区域， 则对于相同的 MBMS业务， 其在不同的小区中的配置信息一般也不同， 因此在进入目 标小区后， UE需要重新读取目标小区中的 MBMS业务配置信息， 并根 据该配置信息接收相应的 MBMS业务；
所述 MBMS业务配置信息至少包括： SIB 13、 MCCH消息、 多播信 道调度信息 （MSI, MCH Scheduling Information ) 等。
步骤 306 , UE请求建立 PTP连接， 用于通过 PTP方式接收所需的
MBMS业务；
所述请求是指 UE进入目标小区， 在目标小区中发起的请求； 所述 请求可以是接入层 （AS , Access Stratum ) 消息或非接入层 （NAS , Non- Access Stratum )消息；所述 AS消息是指 UE向目标小区所在的 eNB 发送的请求消息； 所述 NAS消息是指 UE向目标小区所属的移动管理实 体 ( MME , Mobility Management Entity )发送的请求消息； 所述请求可以由 UE通过 PSS client发起；
所述请求包括以下至少一种信息： MBMS业务标识 （ID ) 、 MBMS 会话开始时间、 UE所属的 PDN-GW;
所述请求到达网络侧后， 网络侧为 UE建立 PTP承载；
所述 UE为空闲模式或连接模式的 UE , 对于空闲模式的 UE需要与 网络侧建立 RRC连接。
步骤 307 , UE在目标小区通过 PTP方式继续接收所需的 MBMS业 务； 当前处理流程结束。
步骤 308 , UE在目标小区通过 PTM方式继续接收所需的 MBMS业 务； 当前处理流程结束；
源小区和目标小区属于相同的 MBSFN区域， 因此 UE可以在目标 小区继续接收 MBMS业务。
通过上述流程， UE 可以继续接收 MBMS 业务， 从而实现挂起的 MBMS业务的连续性。
实施例三
实施例三的场景是： 在 MBMS业务区域内， 通过 PTM接收 MBMS 业务的 UE从 MBSFN区域移动到非 MBSFN区域，如图 1所示的场景 C。
如图 4所示，本发明实施例三的实现 MBMS业务连续性的方法包括： 步骤 401 , UE移动到目标小区， 该目标小区属于非 MBSFN区域； 所述非 MBSFN区域是指该区域中的小区没有发送系统消息 SIB 13； 如果 UE没有发现目标小区的 SIB13 ,则表明目标小区为非 MBSFN区域 中的小区。
步骤 402 , UE判断目标小区和源小区是否属于相同的 MBMS业务 区域， 如果是， 则执行步骤 403 , 否则， 执行步骤 405; BM-SC在 MBMS 业务开始之前， 在 MBMS 业务区域内发送通告 ( announcement ) , 用于简介 MBMS业务的内容、 MBMS业务的开始时 间等；
UE可以根据通告判断目标小区和源小区是否属于相同的 MBMS业 务区域； 例如， 如果 UE在目标小区可以收到所需 MBMS业务的通告， 则说明目标小区和源小区属于相同的 MBMS业务区域；
eNB知道自己所属的 MBMS业务区域， 源小区的 eNB可以和目标 小区的 eNB通过 X2接口交换 MBMS业务区域信息，根据交换的 MBMS 业务区域信息， 源小区的 eNB可以将 UE切换到相同业务 MBMS 区域 的 eNB所在的目标小区。
步骤 403 , UE请求建立 PTP连接， 用于通过 PTP方式接收所需的 MBMS业务； 即 UE向网络侧发送请求消息， 请求网络侧通过 PTP方式 发送所需的 MBMS业务；
步骤 403与步骤 306相同， 在此不再赘述。
步骤 404 , UE在目标小区通过 PTP方式继续接收所需的 MBMS业 务； 当前处理流程结束。
步骤 405 , UE进入目标小区， MBMS业务中断；
当 MBMS业务中断时， 可以通过 AS层向 NAS层或应用层发送消 息指示 MBMS业务中断的原因： UE离开了 MBMS业务区域， 这样可以 提高用户的 MBMS业务体验。
实施例四
实施例四的场景是： 在 MBMS 业务区域内， 通过 PTP 方式接收 MBMS业务的 UE从非 MBSFN区域移动到 MBSFN区域， 如图 1所示 的场景 D。
如图 5所示，本发明实施例四的实现 MBMS业务连续性的方法包括： 步骤 501 , UE从非 MBSFN区域中的源小区移动到 MBSFN区域中 的目标小区；
UE可以通过系统消息判断目标小区是否为某一个 M B S FN区域中的 小区， 具体方式为： UE读取目标小区的 SIB1 , 如果 SIB1 中有 SIB13 相关的调度信息， 则说明目标小区为某一个 MBSFN区域中的小区。
步骤 502 , UE判断目标小区是否为保留小区， 如果是， 则执行步骤 505 ; 否则， 执行步骤 503 ;
步骤 502与步骤 302相同， 在此不再赘述。
步骤 503 , UE判断目标小区是否有 UE所需的 MBMS业务； 如果 有， 则执行步骤 504; 否则， 执行步骤 505。
步骤 503与步骤 304相同， 在此不再赘述。
步骤 504 , UE根据目标小区中的 MBMS业务配置信息在目标小区 通过 PTM方式继续接收所需的 MBMS业务； 当前处理流程结束；
步骤 504还包括： UE释放与源小区的 PTP连接；
在目标小区接收 MBMS业务的 UE可以处于空闲模式或连接模式； 所述 MBMS业务配置信息至少包括： SIB13、 MCCH消息、 MSI等。 步骤 505 , UE请求建立 PTP连接， 用于通过 PTP方式接收所需的 MBMS业务；
所述建立 PTP连接是指： 释放与源小区的 PTP连接， 在目标小区重 新建立 PTP连接；
在目标小区建立 PTP连接的过程如步骤 306所述， 在此不再赘述。 步骤 506 , UE在目标小区通过 PTP方式继续接收所需的 MBMS业 务； 当前处理流程结束；
UE在目标小区通过重新建立的 PTP连接接收 MBMS业务。
实施例五 实施例五的场景是： 在 MBMS 业务区域内， 通过 PTP 方式接收 MBMS业务的 UE从非 MBSFN区域的一个小区移动到某一个非 MBSFN 区域的一个小区， 如图 1所示的场景 E。
如图 6所示，本发明实施例五的实现 MBMS业务连续性的方法包括： 步骤 601 , UE移动到非 MBSFN区域中的目标小区；
如果 UE没有发现目标小区的 SIB13 , 则表明目标小区为非 MBSFN 区域中的小区。
步骤 602 , UE在目标小区请求建立 PTP连接， 用于通过 PTP方式 接收所需的 MBMS业务， 如果请求成功， 则执行步骤 603 ; 否则， 执行 步骤 604;
所述请求失败是指： 由于随机接入失败， 或者其他原因导致 RRC连 接请求失败；
对于随机接入失败的情况， UE 可能后续重复发起请求， 因此本步 骤可能执行多次。
步骤 603 , UE在目标小区通过 PTP方式继续接收所需的 MBMS业 务； 当前处理流程结束。
步骤 604 , UE进入目标小区， 所需的 MBMS业务中断；
当 MBMS业务中断时， 可以通过 AS层向 NAS层或应用层发送消 息指示 MBMS业务中断的原因： UE离开了 MBMS业务区域， 这样可以 提高用户的 MBMS业务体验。
为实现上述方法， 本发明相应提供一种实现 MBMS 业务连续性的 UE, 所述 UE用于： 在正在接收或者感兴趣接收 MBMS业务的所述 UE 移动时， 当所述 UE处于空闲模式时， 选择与 MBMS业务同频的目标小 区进行小区重选， 或者将 MBMS 频率作为最高优先级频率进行小区重 选； 或者用于： 在正在接收或者感兴趣接收 MBMS业务的所述 UE移动 时， 当所述 UE处于连接模式时， 向网络侧上报 UE的 MBMS接收状态， 使网络侧根据 UE上报的 MBMS接收状态选择与 MBMS业务同频的目 标小区进行切换。
所述 UE还用于：
在确定了目标小区进行小区重选或切换后， 根据所述目标小区的属 性判断目标小区能否提供所述 MBMS业务； 如果能， 则在所述目标小区 通过 PTM方式接收所述 MBMS业务； 否则， 请求建立 PTP连接， 并在 所述目标小区通过 PTP方式接收所述 MBMS业务。
所述 UE进一步用于： 在源小区通过 PTM方式接收所述 MBMS业 务的 UE移动到目标小区后，
确定所述目标小区为 MBSFN区域中的保留小区时； 或
确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务的非保 留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或
确定所述目标小区属于非 MBSFN 区域且所述目标小区与源小区属 于相同的 MBMS业务区域时，
请求建立 PTP 连接， 并在所述目标小区通过 PTP 方式接收所述 MBMS业务。
所述 UE进一步用于：在源小区通过 PTP方式接收所述 MBMS业务 的 UE移动到目标小区后， 确定所述目标小区为 MBSFN区域中的有所 述 MBMS业务的非保留小区时， 根据目标小区中的 MBMS业务配置信 息通过 PTM方式继续接收所述 MBMS业务。
示例性地， 如图 7所示， 所述 UE包括：
重选模块 10, 用于在正在接收或者感兴趣接收 MBMS业务的所述 UE移动时， 当所述 UE处于空闲模式时， 选择与 MBMS业务同频的目 标小区进行小区重选，或者将 MBMS频率作为最高优先级频率进行小区 重选；
上报模块 20, 用于在正在接收或者感兴趣接收 MBMS业务的所述 UE移动时， 当所述 UE处于连接模式时 , 向网络侧上报 UE的 MBMS 接收状态， 使网络侧根据 UE上报的 MBMS接收状态选择与 MBMS业 务同频的目标小区进行切换。
所述 UE还包括： 判断模块 30, 用于根据所述目标小区的属性判断 目标小区能否提供所述 MBMS业务； 如果能， 则触发第一接收模块 40; 否则， 触发第二接收模块 50;
第一接收模块 40 , 用于在所述目标小区通过 PTM 方式接收所述 MBMS业务； 及
第二接收模块 50 , 用于请求建立 PTP连接， 并在所述目标小区通过 PTP方式接收所述 MBMS业务。
所述判断模块 30 进一步用于： 在源小区通过 PTM 方式接收所述 MBMS业务的 UE移动到目标小区后，
确定所述目标小区为 MBSFN区域中的保留小区时； 或
确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务的非保 留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或
确定所述目标小区属于非 MBSFN 区域且所述目标小区与源小区属 于相同的 MBMS业务区域时，
触发所述第二接收模块 50。
所述判断模块 30 进一步用于： 在源小区通过 PTP 方式接收所述 MBMS业务的 UE移动到目标小区后， 确定所述目标小区为 MBSFN区 域中的有所述 MBMS业务的非保留小区时， 触发所述第一接收模块 40 根据目标小区中的 MBMS 业务配置信息通过 PTM 方式继续接收所述 MBMS业务。
为实现上述方法，本发明相应提供一种实现 MBMS业务连续性的系 统， 所述系统包括： 正在接收或者感兴趣接收 MBMS业务的 UE和网络 侧； 其中，
UE用于：在 UE移动时，当所述 UE处于空闲模式时，选择与 MBMS 业务同频的目标小区进行小区重选，或者将 MBMS频率作为最高优先级 频率进行小区重选； 或用于在 UE移动时， 当所述 UE处于连接模式时， 上报 UE的 MBMS接收状态；
网络侧用于： 根据 UE上报的 MBMS接收状态选择与 MBMS业务 同频的目标小区进行切换。
所述 UE的示例性结构如图 7所示， 其中各功能模块已在上文描述 过， 在此不再赘述。 示例性地， 所述网络侧包括： 切换模块 100 , 用于 根据上报模块 20上报的 MBMS接收状态选择与 MBMS业务同频的目标 小区进行切换。
本领域技术人员应当理解 , 本发明实现 MBMS连续性的 UE和系统 是为实现前述实现 MBMS连续性的方法而设计的， 因此， 上述各模块的 实现功能可参照前述方法的相关描述， 在此不再赘述。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种实现多媒体广播多播业务 MBMS连续性的方法， 其特征在 于， 所述方法包括： 正在接收或者感兴趣接收 MBMS 业务的用户设备 UE移动时， 当 UE处于空闲模式时， UE选择与 MBMS业务同频的目标 小区进行小区重选或者 UE将 MBMS频率作为最高优先级频率进行小区 重选； 或者当 UE处于连接模式时， 网络侧根据 UE上报的 MBMS接收 状态选择与 MBMS业务同频的目标小区进行切换。
2、 根据权利要求 1所述的方法， 其特征在于， 在确定了目标小区进 行小区重选或切换后， 所述方法还包括： 所述 UE根据所述目标小区的 属性判断目标小区能否提供所述 MBMS业务， 如果能， 则所述 UE在所 述目标小区通过点到多点 PTM方式接收所述 MBMS业务； 否则， 所述 UE请求建立点到点 PTP连接， 并在所述目标小区通过 PTP方式接收所 述 MBMS业务。
3、 根据权利要求 2所述的方法， 其特征在于， 所述方法具体包括： 当在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到不能 提供所述 MBMS业务的目标小区时， 所述 UE请求建立 PTP连接， 并通 过 PTP方式继续接收所述 MBMS业务。
4、 根据权利要求 3所述的方法， 其特征在于， 所述方法具体包括： 当 UE确定所述目标小区为组播广播单频网 MBSFN区域中的保留 小区时； 或
当 UE确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务 的非保留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或 当 UE确定所述目标小区属于非 MBSFN区域且所述目标小区与源 小区属于相同的 MBMS业务区域时，
所述 UE请求建立 PTP连接，并通过 PTP方式继续接收所述 MBMS 业务。
5、 根据权利要求 4所述的方法， 其特征在于， 所述 UE根据目标小 区的系统信息块 SIB13中的指示判断所述目标小区是否为 MBSFN区域 中的保留小区。
6、 根据权利要求 4所述的方法， 其特征在于， 所述 UE根据目标小 区的 SIB13中的 MBSFN区域标识与源小区的 SIB13中的 MBSFN区域 标识是否相同判断目标小区和源小区是否属于相同的 MBSFN 区域， 并 根据目标小区中的 MBMS控制信道 MCCH消息中的 MBMS标识判断目 标小区是否有所述 MBMS业务。
7、 根据权利要求 4所述的方法， 其特征在于， 所述 UE根据目标小 区中是否有 SIB13判断目标小区是否属于非 MBSFN区域， 并根据自身 在目标小区是否收到所述 MBMS 业务的通告判断目标小区与源小区是 否属于相同的 MBMS业务区域。
8、 根据权利要求 2所述的方法， 其特征在于， 所述方法具体包括： 当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到能提供 所述 MBMS业务的目标小区时， 所述 UE通过 PTM方式继续接收所述 MBMS业务。
9、 根据权利要求 8所述的方法， 其特征在于， 所述方法具体包括： 当 UE确定所述目标小区为 MBSFN区域中的有所述 MBMS业务的 非保留小区时， 所述 UE根据目标小区中的 MBMS 业务配置信息通过 PTM方式继续接收所述 MBMS业务。
10、 根据权利要求 2所述的方法， 其特征在于， 所述方法具体包括： 当在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到目标 小区； 其中， 所述目标小区为 MBSFN区域中的有所述 MBMS业务的非 保留小区， 且目标小区所属的 MBSFN区域与源小区的不同时， 所述 UE 根据目标小区中的 MBMS 业务配置信息通过 PTM 方式继续接收所述 MBMS业务。
11、 根据权利要求 2所述的方法， 其特征在于， 所述方法具体包括： 当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到 MBSFN区 域中的没有所述 MBMS业务的非保留小区时； 或
当在所述源小区通过 PTP方式接收所述 MBMS业务的 UE移动到 MBSFN区域中的保留小区时，所述 UE请求建立 PTP连接，并通过 PTP 方式继续接收所述 MBMS业务。
12、 根据权利要求 2所述的方法， 其特征在于， 所述方法具体包括： 当在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到非 MBSFN 区域中的小区时， 所述 UE请求建立 PTP连接， 如果请求成功， 则 UE 通过 PTP方式继续接收所述 MBMS业务； 否则，所述 MBMS业务中断。
13、 根据权利要求 2所述的方法， 其特征在于， 所述方法还包括： 当在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到与源小区 属于不同的 MBMS业务区域的目标小区时， 所述 MBMS业务中断。
14、 根据权利要求 12或 13所述的方法， 其特征在于， 所述方法还 包括： 当所述 MBMS业务中断时， 通过接入层向非接入层或应用层指示 所述 MBMS业务中断的原因。
15、 一种实现多媒体广播多播业务连续性的 UE , 其特征在于， 所 述 UE用于：在正在接收或者感兴趣接收 MBMS业务的所述 UE移动时， 当所述 UE处于空闲模式时， 选择与 MBMS业务同频的目标小区进行小 区重选， 或者将 MBMS频率作为最高优先级频率进行小区重选；
或者用于： 在正在接收或者感兴趣接收 MBMS业务的所述 UE移动 时， 当所述 UE处于连接模式时， 向网络侧上报 UE的 MBMS接收状态， 使网络侧根据 UE上报的 MBMS接收状态选择与 MBMS业务同频的目 标小区进行切换。
16、 根据权利要求 15所述的 UE, 其特征在于， 所述 UE还用于： 在确定了目标小区进行小区重选或切换后， 根据所述目标小区的属 性判断目标小区能否提供所述 MBMS业务； 如果能， 则在所述目标小区 通过 PTM方式接收所述 MBMS业务； 否则， 请求建立 PTP连接， 并在 所述目标小区通过 PTP方式接收所述 MBMS业务。
17、 根据权利要求 16所述的 UE, 其特征在于， 所述 UE进一步用 于： 在源小区通过 PTM方式接收所述 MBMS业务的 UE移动到目标小 区后，
确定所述目标小区为 MBSFN区域中的保留小区时； 或
确定所述目标小区为 MBSFN区域中的没有所述 MBMS业务的非保 留小区， 且目标小区所属的 MBSFN区域与源小区的不同时； 或
确定所述目标小区属于非 MBSFN 区域且所述目标小区与源小区属 于相同的 MBMS业务区域时，
请求建立 PTP 连接， 并在所述目标小区通过 PTP 方式接收所述 MBMS业务。
18、 根据权利要求 16所述的 UE, 其特征在于， 所述 UE进一步用 于：在源小区通过 PTP方式接收所述 MBMS业务的 UE移动到目标小区 后，确定所述目标小区为 MBSFN区域中的有所述 MBMS业务的非保留 小区时， 根据目标小区中的 MBMS业务配置信息通过 PTM方式继续接 收所述 MBMS业务。
19、 一种实现多媒体广播多播业务连续性的系统， 其特征在于， 所 述系统包括： 正在接收或者感兴趣接收 MBMS业务的 UE和网络侧； 其 中，
UE用于：在 UE移动时，当所述 UE处于空闲模式时，选择与 MBMS 业务同频的目标小区进行小区重选，或者将 MBMS频率作为最高优先级 频率进行小区重选； 或用于在 UE移动时， 当所述 UE处于连接模式时， 上报 UE的 MBMS接收状态；
网络侧用于：根据 UE上报的 MBMS接收状态选择与 MBMS业务同频 的目标小区进行切换。
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