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Method, device and system for maintaining continuity of group communication service
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A group communication and continuity technology, applied in the field of communication, can solve the problem of inability to meet the service continuity requirements of group communication, and achieve the effect of ensuring continuity
Active Publication Date: 2015-07-01
DATANG MOBILE COMM EQUIP CO LTD
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[0013] Embodiments of the present invention provide a method, device and system for maintaining continuity of group communication services, which are used to solve the problem existing in the prior art when the network switches the multicast transmission of services in the relevant MBSFN domain to unicast transmission, which may The problem caused by the inability to meet the business continuity requirements of group communication
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Embodiment 1
[0199] Embodiment 1. In this embodiment, the BM-SC sends MBMS session multicast / unicast transmission conversion information through the user plane SYNC protocol mechanism. For specific procedures, see Figure 4 shown, including the following steps:
[0200] Step 0: User equipment (UE) uses MBMS bearer to receive group communication services, and the UE can be in an idle state or a connected state.
[0201] Step 1: The GCSE-AS notifies the BM-SC through the GC2 interface that the GCSE-AS is about to switch from multicast transmission to unicast transmission of the group communication service.
[0202] Step 2: The BM-SC instructs the eNB that the GCSE-AS is about to convert the MBMS session from multicast transmission to unicast transmission by enhancing the SYNC information of the user plane SYNC protocol (for example, using a new PDU TYPE=4).
[0203] Step 3: After the eNB receives the data packet carrying the SYNC information, it judges that the GCSE-AS is about to switch th...
Embodiment 2
[0210] Embodiment 2. In this embodiment, the BM-SC sends the MBMS session multicast / unicast transmission conversion information through the control plane mechanism. For the specific process, see Figure 5 shown, including the following steps:
[0211] Step 0: The UE uses the MBMS bearer to receive the group communication service, and the UE can be in an idle state or a connected state.
[0212] Step 1: The GCSE-AS notifies the BM-SC through the GC2 interface that the GCSE-AS is about to switch from multicast transmission to unicast transmission of the group communication service.
[0213] Step 2: The BM-SC sends an MBMS session switching message to the MBMS-GW through the control plane mechanism, notifying the MBMS-GW that the MBMS service needs to be switched from multicast transmission to unicast transmission.
[0214] Wherein, the MBMS session conversion message may be a new message, or enhance the existing MBMS Session Update message (that is, add an indication informatio...
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Abstract
Disclosed are a method, device and system for maintaining the continuity of a group communication service, for solving the problem in the prior art that the service continuity requirement of group communication may not be satisfied due to the switching of network service from multicast transmission to unicast transmission in an MBSFN domain. The method comprises: when determining that group communication service needs to be switched from multicast transmission to unicast transmission, a GCSE-AS notifies a terminal served by the GCSE-AS that the GCSE-AS is going to switch the group communication service from multicast transmission to unicast transmission; and after receiving a first notification message transmitted by the terminal, the GCSE-AS transmits the group communication service over a unicast carrier established by the terminal for unicast transmission, and stops transmitting the communication service in multicast mode. The terminal has already established a unicast carrier for unicast transmission before the GCSE-AS switches the group communication service from multicast transmission to unicast transmission, thus ensuring the continuity of the group communication service.
Description
technical field [0001] The present invention relates to the technical field of communication, in particular to a method, device and system for maintaining continuity of group communication services. Background technique [0002] Group communication refers to a communication mode in which the network simultaneously transmits service data to multiple terminals belonging to the group. The network architecture of group communication such as figure 1 As shown, the functions of each interface in the network architecture are as follows: [0003] M3 interface: Provides session (Session) management related functions between the Mobility Management Entity (MME) and the multi-cell / multicast coordination entity (Multi-cell / Multicast Coordination Entity, MCE), such as session start (session start ), session stop (session stop) notification; [0004] M2 interface: Provides functions such as session management and transmission of MultimediaBroadcast Multicast Service (MBMS) scheduling ...
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