WO2015096718A1 - 一种保持组通信业务连续性的方法、装置和系统 - Google Patents

一种保持组通信业务连续性的方法、装置和系统 Download PDF

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Publication number
WO2015096718A1
WO2015096718A1 PCT/CN2014/094744 CN2014094744W WO2015096718A1 WO 2015096718 A1 WO2015096718 A1 WO 2015096718A1 CN 2014094744 W CN2014094744 W CN 2014094744W WO 2015096718 A1 WO2015096718 A1 WO 2015096718A1
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WIPO (PCT)
Prior art keywords
gcse
group communication
conversion
communication service
transmission
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PCT/CN2014/094744
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English (en)
French (fr)
Inventor
汪颖
刘建华
赵亚利
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to US15/105,644 priority Critical patent/US10158980B2/en
Priority to EP14875508.5A priority patent/EP3089487B1/en
Publication of WO2015096718A1 publication Critical patent/WO2015096718A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/25—Maintenance of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method, apparatus, and system for maintaining continuity of a group communication service.
  • Group communication refers to a communication mode in which a network simultaneously transmits service data to a plurality of terminals belonging to the group.
  • the network architecture of group communication is shown in Figure 1. The functions of each interface in the network architecture are as follows:
  • M3 interface Provides session management related functions between the Mobility Management Entity (MME) and the Multi-cell/Multicast Coordination Entity (MCE), such as session start (session start) ), session stop (session stop) notification;
  • MME Mobility Management Entity
  • MCE Multi-cell/Multicast Coordination Entity
  • the M2 interface provides functions such as session management and delivery of Multimedia Broadcast Multicast Service (MBMS) scheduling information between the MCE and the Evolved Node B (eNB);
  • MBMS Multimedia Broadcast Multicast Service
  • M1 interface providing MBMS service transmission between an MBMS gateway (Gateway, GW) and an eNB;
  • GW MBMS gateway
  • the interface between the user equipment (User Equipment, UE, also called the terminal) and the Group Communication Service Enabler Application Server (GCSE AS) is used to define the service layer command of the GCSE related function. Session establishment, flow control, etc.
  • GC2 interface provides the interaction function between the Broadcast Multicast-Service Centre (BM-SC) and the GCSE AS;
  • BM-SC Broadcast Multicast-Service Centre
  • SGi-mb interface user plane interface of BM-SC and MBMS GW;
  • SGmb interface Control plane interface of BM-SC and MBMS GW.
  • the group communication terminals can be divided into two categories: one is a transmitting terminal, that is, a terminal authorized by the group communication server to send group communication data to the group communication server, the transmitting terminal and The uplink data between the group communication servers is transmitted by means of unicast; the second is the receiving terminal, that is, the terminal authorized by the group communication server to receive the group communication data delivered by the group communication server, and the receiving terminal can be unicast or multicast. Receive group communication data from the network.
  • the network side ie, GCSE-AS
  • LTE unicast evolved packet system Evolved Packet
  • EPS evolved packet system
  • the network side can use the existing MBMS network to broadcast the group of communication services.
  • the network side can perform switching between multicast transmission and unicast transmission according to a set policy. For example, if the number of user equipments receiving a certain group of communication services in a cell is reduced, the network can switch the multicast transmission of the service in the MBMS Single Frequency Network (MBSFN) domain to the unicast transmission.
  • MBSFN Single Frequency Network
  • the network device cannot transmit the group of communication services on the unicast EPS bearer because the user equipment does not establish a suitable unicast EPS bearer.
  • the group communication service has a long interruption time and cannot meet the requirements of group communication for business continuity.
  • the embodiment of the present application provides a method, an apparatus, and a system for maintaining continuity of a group communication service, which are used to solve the problem that when a network switches a service in a related MBSFN domain to a unicast transmission, The resulting problem of inability to meet group communication requirements for business continuity.
  • the embodiment of the present application provides a method for maintaining continuity of a group communication service, including:
  • the GCSE-AS notifies the GCSE-AS served by the GCSE-AS to perform the group communication service from multicast to unicast when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission. Conversion of transmission;
  • the GCSE-AS After receiving the first notification message sent by the terminal, the GCSE-AS transmits the group communication service on a unicast bearer that is established by the terminal for unicast transmission, and stops transmitting by using multicast mode.
  • the group communication service After receiving the first notification message sent by the terminal, the GCSE-AS transmits the group communication service on a unicast bearer that is established by the terminal for unicast transmission, and stops transmitting by using multicast mode.
  • the terminal when the GCSE-AS switches the group communication service from the multicast transmission to the unicast transmission without changing the existing network architecture, the terminal has established a unicast bearer for unicast transmission, thereby ensuring The continuity of the group communication service.
  • the GCSE-AS notifies the terminal that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission, including:
  • the GCSE-AS sends a second notification message to the BM-SC through the GC2 interface, where the second notification message is used to notify the BM-SC that the GCSE-AS will perform the group communication service from multicast.
  • the conversion to a unicast transmission is used to notify the BM-SC that the GCSE-AS will perform the group communication service from multicast.
  • the method further includes:
  • the BM-SC After receiving the second notification message, the BM-SC sends data carrying synchronization (SYNC) information to the base station, where the SYNC information carries information indicating that the GCSE-AS will perform the group. Indication information for the conversion of the communication service from multicast transmission to unicast transmission; or
  • the BM-SC After receiving the second notification message, the BM-SC sends a first MBMS session conversion message to the MBMS gateway to notify the MBMS gateway that the GCSE-AS will perform the group communication service from multicast transmission to Conversion of unicast transmissions.
  • the first MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • the method further includes: after receiving the first MBMS session conversion message, the MBMS gateway sends a second MBMS session conversion message to the MME to notify the MME that the GCSE-AS will perform the group communication.
  • the second MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • the method further includes: after receiving the second MBMS session conversion message, the MME sends a third MBMS session conversion message to the MCE to notify the MCE that the GCSE-AS will perform the group communication.
  • the third MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • the method further includes: after receiving the third MBMS session conversion message, the MCE sends a fourth MBMS session conversion message to the base station to notify the base station that the GCSE-AS will perform the group communication.
  • the fourth MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission; or
  • the fourth MBMS session conversion message is an MBMS Counting Request message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • the method further includes:
  • the base station After receiving the data carrying the SYNC information or the fourth MBMS session conversion message, the base station notifies the GCSE-AS served by the base station to perform the group communication service from multicast transmission to Conversion of unicast transmissions.
  • the base station notifies the terminal that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission, including:
  • the base station informs the terminal that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission by using MCH Scheduling Information (MSI; Multicast Channel, MCH).
  • MSI MCH Scheduling Information
  • MCH Multicast Channel
  • the base station controls by radio resources on a Multicast Control Channel (MCCH) (Radio Resource Control, RRC) message, informing the terminal served by the base station that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission, where the RRC message carries
  • MCCH Multicast Control Channel
  • RRC Radio Resource Control
  • the base station sends an MBMS Counting Request message on the MCCH to notify the terminal served by the base station that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission, in the MBMS counting request message.
  • the base station notifies the terminal that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission by using a system information block (SIB), where the SIB carries And indication information indicating that the GCSE-AS is to perform a conversion of the group communication service from multicast transmission to unicast transmission.
  • SIB system information block
  • the SIB is SIB13 or SIB15.
  • the embodiment of the present application further provides a method for maintaining continuity of a group communication service, including:
  • the terminal After receiving the notification that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, the terminal triggers the establishment process of the unicast bearer for the unicast transmission;
  • the terminal sends a first notification message to the GCSE-AS, and stops receiving the group communication service by using a multicast mode, where the first notification message is used to notify the GCSE-AS to perform a single transaction for the group communication service. Broadcast transmission.
  • the terminal since the GCSE-AS switches the group communication service from multicast transmission to unicast transmission, the terminal has established a unicast bearer for unicast transmission, thereby ensuring continuity of the group communication service.
  • the terminal receives a notification that the GCSE-AS will perform a conversion of the group communication service from multicast transmission to unicast transmission, including:
  • the terminal receives the MSI sent by the base station to which the terminal belongs, where the MSI carries indication information for instructing the GCSE-AS to perform the conversion of the group communication service from multicast transmission to unicast transmission; or ,
  • the terminal receives, on the MCCH, an RRC message sent by the base station to which the terminal belongs, where the RRC message carries an indication that the GCSE-AS will perform the group communication service from multicast transmission to unicast transmission. Instructions for conversion; or,
  • the terminal receives an MBMS Counting Request message sent by the base station to which the terminal belongs, on the MCCH, where the MBMS Counting Request message is used to indicate that the GCSE-AS will perform the group communication service from multicast transmission to An indication of the conversion of the unicast transmission; or,
  • the SIB sent by the base station to which the terminal belongs, where the SIB carries a conversion for instructing the GCSE-AS to perform the conversion of the group communication service from multicast to unicast transmission. Instructions.
  • the SIB is SIB13 or SIB15.
  • a GCSE-AS including:
  • a first processing module configured to notify the station when it is determined that the group communication service needs to be switched from multicast transmission to unicast transmission
  • the GCSE-AS described by the terminal served by the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission;
  • a second processing module configured to: after receiving the first notification message sent by the terminal, transmit the group communication service on a unicast bearer that is established by the terminal for unicast transmission, and stop using multicast The mode sends the group communication service.
  • the first processing module is specifically configured to:
  • the embodiment of the present application further provides a terminal, including:
  • a first control module configured to trigger a process of establishing a unicast bearer for unicast transmission after receiving a notification that the GCSE-AS performs a transition of the group communication service from the multicast transmission to the unicast transmission;
  • a second control module configured to send a first notification message to the GCSE-AS, and stop receiving the group communication service by using a multicast mode, where the first notification message is used to notify the GCSE-AS to the group
  • the communication service performs unicast transmission.
  • the first control module is specifically configured to:
  • the MSI carries indication information for instructing the GCSE-AS to perform a conversion of the group communication service from multicast transmission to unicast transmission;
  • the RRC message Receiving, by the RRC message, the RRC message sent by the base station to which the terminal belongs, where the RRC message carries an indication that the GCSE-AS is to perform the conversion of the group communication service from multicast transmission to unicast transmission. Information; or,
  • an MBMS Counting Request message sent by the base station to which the terminal belongs, where the MBMS Counting Request message is used to instruct the GCSE-AS to perform the group communication service from multicast transmission to unicast transmission. Instructions for conversion; or,
  • the SIB sent by the base station to which the terminal belongs is received on the MCCH, where the SIB carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the embodiment of the present application further provides a communication system, including:
  • the GCSE-AS is configured to notify the terminal served by the GCSE-AS that the GCSE-AS to perform the multicast transmission of the group communication service when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission. And converting to the unicast transmission; and, after receiving the first notification message sent by the terminal, transmitting the group communication service on the unicast bearer for unicast transmission established by the terminal, and stopping adopting Transmitting the group communication service in a multicast manner;
  • a terminal configured to: after receiving a notification that the GCSE-AS performs a conversion of the group communication service from a multicast transmission to a unicast transmission, triggering a setup process of a unicast bearer for unicast transmission; and, to the GCSE - the AS sends a first notification message and stops receiving the group communication service in a multicast manner, the first notification message being used to notify the The GCSE-AS performs unicast transmission on the group of communication services.
  • the system further includes: a BM-SC and a base station, where:
  • the GCSE-AS is further configured to: send, by using a GC2 interface, a second notification message to the BM-SC, where the second notification message is used to notify the BM-SC that the GCSE-AS is to perform the group communication.
  • the BM-SC is specifically configured to: after receiving the second notification message, send data carrying the SYNC information to the base station, where the SYNC information is used to indicate that the GCSE-AS is to perform the group communication. Indication of the conversion of the service from multicast to unicast transmission;
  • the base station is specifically configured to: after receiving the data carrying the SYNC information, notify the terminal served by the base station that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission. .
  • the system further includes: a BM-SC, an MBMS gateway, an MME, an MCE, and a base station, where:
  • the GCSE-AS is further configured to: send, by using a GC2 interface, a second notification message to the BM-SC, where the second notification message is used to notify the BM-SC that the GCSE-AS is to perform the group communication.
  • the BM-SC is specifically configured to: after receiving the second notification message, send a first MBMS session conversion message to the MBMS gateway to notify the MBMS gateway that the GCSE-AS will perform the group communication The conversion of services from multicast to unicast transmission;
  • the MBMS gateway is specifically configured to: after receiving the first MBMS session conversion message, send a second MBMS session conversion message to the MME, to notify the MME that the GCSE-AS will perform the group communication service. Conversion from multicast transmission to unicast transmission;
  • the MME is specifically configured to: after receiving the second MBMS session conversion message, send a third MBMS session conversion message to the MCE, to notify the MCE that the GCSE-AS will perform the group communication service from the Multicast transmission to unicast transmission conversion;
  • the MCE is specifically configured to: after receiving the third MBMS session conversion message, send a fourth MBMS session conversion message to the base station, to notify the base station that the GCSE-AS will perform the group communication service from the Multicast transmission to unicast transmission conversion;
  • the base station is specifically configured to: after receiving the fourth MBMS session conversion message, notify the terminal served by the base station that the GCSE-AS performs a conversion of the group communication service from multicast transmission to unicast transmission. .
  • the first MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission;
  • the second MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission;
  • the third MBMS session conversion message is an MBMS session update message carrying indication information that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission;
  • the fourth MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission; or the fourth MBMS session
  • the conversion message is an MBMS Counting Request message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • the base station is specifically configured to:
  • the MSI Notifying, by the MSI, that the GCSE-AS performs a conversion of the group communication service from a multicast transmission to a unicast transmission, where the MSI carries an indication that the GCSE-AS will perform the group communication service from An indication of the conversion of the multicast transmission to the unicast transmission; or,
  • the SIB Notifying, by the SIB, that the GCSE-AS performs a conversion of the group communication service from a multicast transmission to a unicast transmission, where the SIB carries a flag indicating that the GCSE-AS will perform the group communication. An indication of the transition of a service from multicast transmission to unicast transmission.
  • the embodiment of the present application further provides a GCSE-AS, including a transceiver, and at least one processor connected to the transceiver, where:
  • the processor is configured for the GCSE-AS to trigger the transceiver to notify the terminal served by the GCSE-AS when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission, the GCSE-AS will perform the group communication service from Multicast transmission to unicast transmission conversion;
  • the transceiver is configured to: receive the first notification message sent by the terminal; the processor is further configured to transmit the group communication service on the unicast bearer that the terminal has established for unicast transmission, and stop using the multicast The mode sends a group communication service.
  • the transceiver is configured to: send a second notification message to the BM-SC through the GC2 interface, where the second notification message is used to notify the BM-SC that the GCSE-AS will perform group communication service from multicast The conversion to a unicast transmission.
  • an embodiment of the present application further provides a BM-SC including a transceiver and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive a second notification message sent by the GCSE-AS;
  • the processor is configured to: according to the second notification message, determine that the GCSE-AS is to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver to send the data carrying the SYNC information to the base station,
  • the SYNC information carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission; or triggering the transceiver to send the first MBMS session conversion message to the MBMS gateway to notify the MBMS Gateway
  • the GCSE-AS will perform the conversion of group communication services from multicast to unicast transmission.
  • the first MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • an embodiment of the present application further provides an MBMS gateway, including a transceiver, and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive a first MBMS session conversion message sent by the BM-SC;
  • the processor is configured to: according to the first MBMS session conversion message, determine that the GCSE-AS is about to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver to send the second MBMS session conversion to the MME.
  • the second MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • an embodiment of the present application further provides an MME, including a transceiver, and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive a second MBMS session conversion message sent by the MBMS gateway;
  • the processor is configured to: according to the second MBMS session conversion message, determine that the GCSE-AS is about to perform a conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver to send the third MBMS session conversion to the MME.
  • the third MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from multicast to unicast transmission.
  • an embodiment of the present application further provides an MCE, including a transceiver, and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive a third MBMS session conversion message sent by the MME;
  • the processor is configured to: according to the third MBMS session conversion message, determine that the GCSE-AS is about to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver to send the fourth MBMS session conversion to the base station.
  • the fourth MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, or the fourth MBMS session conversion message is Carrying a conversion to indicate that the GCSE-AS will perform group communication services from multicast transmission to unicast transmission.
  • An MBMS Counting Request message indicating the information.
  • an embodiment of the present application further provides a base station, including a transceiver, and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive the data carried by the BM-SC carrying the SYNC information or receive the fourth MBMS session conversion message sent by the MCE;
  • the processor is configured to: determine, according to the data carrying the SYNC information or the fourth MBMS session conversion message, that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, and triggers the transceiver notification.
  • the terminal served by the base station, the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the transceiver is configured to:
  • the MSI Notifying, by the MSI, that the GCSE-AS performs a conversion of the group communication service from a multicast transmission to a unicast transmission, where the MSI carries an indication that the GCSE-AS will perform the group communication service from An indication of the conversion of the multicast transmission to the unicast transmission; or,
  • the SIB Notifying, by the SIB, that the GCSE-AS performs a conversion of the group communication service from a multicast transmission to a unicast transmission, where the SIB carries a flag indicating that the GCSE-AS will perform the group communication. An indication of the transition of a service from multicast transmission to unicast transmission.
  • the SIB is SIB13 or SIB15.
  • an embodiment of the present application further provides a terminal, including a transceiver, and at least one processor connected to the transceiver, where:
  • the transceiver is configured to: receive a notification that the GCSE-AS will perform a conversion of the group communication service from the multicast transmission to the unicast transmission;
  • the processor is configured to: trigger a setup process of the unicast bearer for unicast transmission, and trigger the transceiver to send the first notification message to the GCSE-AS, and stop receiving the group communication sent by the GCSE-AS by using the multicast mode
  • the service, the first notification message is used to notify the GCSE-AS to perform unicast transmission on the group communication service.
  • the transceiver is configured to specifically:
  • an MSI Receiving, by the base station to which the terminal belongs, an MSI, where the MSI carries indication information for instructing the GCSE-AS to perform a conversion of the group communication service from the multicast transmission to the unicast transmission; or
  • the RRC message Receiving, by the RRC message, the RRC message sent by the base station to which the terminal belongs, where the RRC message carries the indication information used to indicate that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission; or
  • an MBMS Counting Request message sent by the base station to which the terminal belongs, where the MBMS Counting Request message carries indication information for instructing the GCSE-AS to perform a conversion of the group communication service from the multicast transmission to the unicast transmission;
  • the SIB sent by the base station to which the terminal belongs is received on the MCCH, where the SIB carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • FIG. 1 is a schematic diagram of a network architecture of group communication in the background art
  • FIG. 2 is a schematic diagram of a method for maintaining continuity of a group communication service on a network side according to the present application
  • FIG. 3 is a schematic diagram of a method for maintaining continuity of a group communication service on a terminal side according to the present application
  • Embodiment 4 is a schematic flow chart of Embodiment 1 provided by the present application.
  • FIG. 5 is a schematic flowchart of Embodiment 2 provided by the present application.
  • FIG. 6 is a schematic structural diagram of a GCSE-AS provided by the present application.
  • FIG. 7 is a schematic structural diagram of a terminal provided by the present application.
  • FIG. 8 is a schematic structural diagram of a communication system according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another GCSE-AS provided by the present application.
  • FIG. 10 is a schematic structural diagram of a BM-SC provided by the present application.
  • FIG. 11 is a schematic structural diagram of an MBMS gateway provided by the present application.
  • FIG. 13 is a schematic structural diagram of an MCE provided by the present application.
  • FIG. 14 is a schematic structural diagram of a base station provided by the present application.
  • FIG. 15 is a schematic structural diagram of another terminal provided by the present application.
  • the embodiment of the present application provides a method for maintaining continuity of a group communication service on a network side, where the method includes the following steps:
  • Step 21 The GCSE-AS notifies the terminal served by the GCSE-AS when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission, and the GCSE-AS performs the group communication service from the multicast transmission to the unicast transmission. Conversion
  • Step 22 After receiving the first notification message sent by the terminal, the GCSE-AS transmits the group communication service on the unicast bearer that is established by the terminal for unicast transmission, and stops transmitting the group communication service by using the multicast mode.
  • the sequence in which the group communication service is sent in the unicast mode and the group communication service is stopped in the multi-play mode is not limited.
  • the GCSE-AS may first transmit the group communication service on the unicast bearer, and then stop using the multicast mode to send the group communication service; or may stop using the multicast mode first.
  • the group communication service is sent, and the group communication service is transmitted on the unicast EPS bearer.
  • the GCSE-AS when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission, notifies the terminal served by the GCSE-AS that the GCSE-AS transmits the group communication service from the multicast to the The conversion of the unicast transmission; and after receiving the first notification message sent by the terminal, the GCSE-AS transmits the group communication service on the unicast bearer that the terminal has established for unicast transmission, and stops using the multicast mode. Send group communication services.
  • the terminal when the GCSE-AS switches the group communication service from the multicast transmission to the unicast transmission without changing the existing network architecture, the terminal has established a unicast bearer for unicast transmission, thereby ensuring The continuity of the group communication service.
  • the GCSE-AS may notify the terminal in different manners that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, specifically:
  • the terminal is in an idle state (idle);
  • step 21 the GCSE-AS notifies the terminal that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and specifically includes:
  • the GCSE-AS sends a second notification message to the BM-SC through the GC2 interface, where the second notification message is used to notify the BM-SC that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the BM-SC may notify the Evolved UMTS Terrestrial Radio Access Network (E-UTRAN; Universal Mobile) by using a user plane mechanism or a control plane mechanism.
  • E-UTRAN Evolved UMTS Terrestrial Radio Access Network
  • UMTS Telecommunications System
  • the GCSE-AS will perform the conversion of group communication services from multicast transmission to unicast transmission.
  • the BM-SC After receiving the second notification message, the BM-SC notifies the E-UTRAN side device that the GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission through the user plane mechanism, which specifically includes:
  • the BM-SC sends data carrying the SYNC information to the base station, and the SYNC information carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • PDU Protocol Data Unit
  • TYPE Protocol Data Unit type
  • an indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission may be added to the existing SYNC information.
  • the base station determines that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and further, the base station notifies the GCSE that is served by the base station.
  • the AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the base station notifies the serving terminal GCSE-AS to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, including the following methods:
  • the base station informs the terminal that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission through the MCH, where the MSI carries the indication that the GCSE-AS will perform the group communication service.
  • the indication of the conversion of the transmission to the unicast transmission is the indication of the conversion of the transmission to the unicast transmission.
  • the base station expands the existing MSI to notify the terminal that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the base station may indicate, by using the reserved value in the MSI, that the terminal GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission.
  • the base station informs the terminal GCSE-AS served by the base station to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, where the RRC message carries the indication for the GCSE-
  • the AS will perform indication of the conversion of the group communication service from multicast transmission to unicast transmission.
  • the base station sends a new RRC message to notify the terminal that the GCSE-AS will perform group communication service from multicast.
  • Manner 3 The base station sends an MBMS Counting Request message on the MCCH to notify the terminal that the base station served by the base station GCSE-AS to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, wherein the MBMS Counting Request (MBMS Counting Request)
  • the message carries indication information indicating that the GCSE-AS will perform a conversion of the group communication service from multicast transmission to unicast transmission.
  • the base station expands the existing MBMS counting request message, that is, the existing MBMS counting request message carries a conversion for instructing the GCSE-AS to perform the group communication service from the multicast transmission to the unicast transmission. Instructing information to inform the terminal that the GCSE-AS will perform a conversion of the group communication service from multicast transmission to unicast transmission.
  • Mode 4 The base station informs the terminal GCSE-AS to perform the conversion of the group communication service from the multicast transmission to the unicast transmission through the SIB, where the SIB carries the indication that the GCSE-AS will perform the group communication service from the multicast transmission to the Indication of conversion of unicast transmission.
  • the base station may extend the existing SIB, that is, carry the indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission in the existing SIB, to notify the terminal.
  • the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission; the new SIB can also inform the terminal that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the base station may carry the indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission by extending the existing SIB13 or the SIB15, and broadcasting the manner. Notifying the terminal that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the base station may notify the terminal that it serves that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the BM-SC After receiving the second notification message, the BM-SC notifies the E-UTRAN side device that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission by using a control plane mechanism, which specifically includes:
  • the BM-SC After receiving the second notification message, the BM-SC sends a first MBMS session conversion message to the MBMS gateway to notify the MBMS gateway that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the first MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the first MBMS Session Change message is an MBMS Session Update message carrying the indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, that is, the BM-SC
  • the existing MBMS Session Update message is extended to inform the MBMS gateway that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the MBMS gateway after receiving the first MBMS session conversion message, the MBMS gateway sends a second MBMS session conversion message to the MME to notify the MME that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the second MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the second MBMS session change message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the group communication service from the multicast transmission to the unicast transmission, that is, the MBMS gateway adopts The existing MBMS Session Update message is extended to inform the MME that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the MME after receiving the second MBMS session conversion message, the MME sends a third MBMS session conversion message to the MCE to notify the MCE that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the third MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the third MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, that is, the MME adopts the existing MBMS Session.
  • the Update message is extended to inform the MCE that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the MCE after receiving the third MBMS session conversion message, the MCE sends a fourth MBMS session conversion message to the base station to notify the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the fourth MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the fourth MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the group communication service from the multicast transmission to the unicast transmission, that is, the MCE adopts the pair.
  • the existing MBMS Session Update message is extended to inform the base station that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the fourth MBMS session conversion message is an MBMS Counting Request (MBMS Counting Request) carrying indication information indicating that the GCSE-AS will perform a group communication service from multicast transmission to unicast transmission.
  • the message that is, the MCE, extends the existing MBMS Counting Request message to inform the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the base station determines that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, and further, the base station notifies the GCSE-AS of the terminal it serves. The conversion of the group communication service from multicast transmission to unicast transmission will be performed.
  • the base station notifies the serving terminal GCSE-AS to convert the group communication service from the multicast transmission to the unicast transmission by using any one of the foregoing manners 1 to 4.
  • the base station notifies the serving terminal GCSE-AS to convert the group communication service from the multicast transmission to the unicast transmission by using any one of the foregoing manners 1 to 4.
  • the terminal is connected (connected);
  • the GCSE-AS may adopt a scheme in which the foregoing terminal is in an idle state, and notify the terminal.
  • the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission. For details, refer to the description that the terminal is in the idle state, and details are not described herein.
  • the GCSE-AS directly sends a notification message to the terminal it serves to inform the terminal that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the embodiment of the present application further provides a method for maintaining continuity of a group communication service on the terminal side.
  • the method includes the following steps:
  • Step 31 After receiving the notification that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, the terminal triggers the establishment process of the unicast bearer for the unicast transmission.
  • the terminal uses the MBMS bearer for multicast transmission to receive the group communication service, and the terminal may be in an idle state or a connected state; the terminal receives the GCSE-AS to perform the group communication service from the multicast.
  • the terminal After transmitting the notification of the conversion to the unicast transmission, it is learned that the group communication service will perform the conversion from the multicast transmission to the unicast transmission, and therefore, the terminal triggers the establishment of the unicast bearer (such as the EPS bearer) for the unicast transmission. process.
  • the unicast bearer such as the EPS bearer
  • Step 32 The terminal sends a first notification message to the GCSE-AS, and stops receiving the group communication service sent by the GCSE-AS in a multicast manner, where the first notification message is used to notify the GCSE-AS to perform unicast transmission on the group communication service.
  • the terminal In this step, after the unicast bearer is established, the terminal notifies the GCSE-AS to perform unicast transmission. After that, the terminal stops receiving the group communication service sent by the GCSE-AS by using the multicast mode.
  • the terminal receives the notification that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and triggers the establishment process of the unicast bearer used for the unicast transmission;
  • the first notification message is sent to the GCSE-AS, and the group communication service sent by the GCSE-AS is stopped in the multicast mode.
  • the first notification message is used to notify the GCSE-AS to perform unicast transmission on the group communication service. Since the GCSE-AS switches the group communication service from multicast transmission to unicast transmission, the terminal has established a unicast bearer for unicast transmission, thereby ensuring the continuity of the group communication service.
  • the terminal receives the notification that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and specifically includes:
  • the terminal receives the MSI sent by the base station to which the terminal belongs, where the MSI carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the foregoing manner 1 for details) ;
  • the terminal receives, on the MCCH, an MBMS count request message sent by the base station to which the terminal belongs, where the MBMS count request message carries a conversion for instructing the GCSE-AS to perform group communication service from multicast transmission to unicast transmission. Instructions (see the description of Mode 3 above);
  • the terminal receives the SIB sent by the base station to which the terminal belongs on the MCCH, where the SIB carries indication information for indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner 4). description of).
  • Embodiment 1 the BM-SC sends the MBMS session multicast/unicast transmission conversion information through the user plane SYNC protocol mechanism.
  • the following steps are included:
  • Step 0 The UE uses the MBMS bearer to receive the group communication service, and the UE may be in an idle state or a connected state.
  • Step 1 The GCSE-AS informs the BM-SC through the GC2 interface that the GCSE-AS is about to perform the multicast transmission of the group communication service to the unicast transmission.
  • Step 3 After receiving the data packet carrying the SYNC information, the eNB determines that the GCSE-AS is about to perform the MBMS session from the multicast transmission to the unicast transmission conversion, and the eNB will notify the UE that the GCSE-AS is about to perform the MBMS session from the multicast transmission. Conversion to unicast transmission.
  • the eNB may notify the UE by using any one of the foregoing methods 1 to 4.
  • Step 4 After receiving the indication information sent by the eNB to indicate that the GCSE-AS is about to perform the transition of the MBMS session multicast transmission to the unicast transmission, the UE triggers the establishment process of the unicast EPS bearer for the unicast transmission.
  • Step 5 The UE directly notifies the GCSE-AS to perform unicast transmission.
  • Step 6 After receiving the notification from the UE, the GCSE-AS transmits the group communication service on the unicast EPS bearer that has been established by the UE.
  • Step 7 The UE stops receiving the MBMS service, that is, the UE stops receiving the group communication service by using the multicast mode.
  • Step 8 The GCSE-AS stops the MBMS transmission of the group of communication services, that is, the GCSE-AS stops transmitting the group communication service to the UE by using the multicast mode.
  • Embodiment 2 the BM-SC sends the MBMS session multicast/unicast transmission conversion information through the control plane mechanism.
  • the following steps are included:
  • Step 0 The UE uses the MBMS bearer to receive the group communication service, and the UE may be in an idle state or a connected state.
  • Step 1 The GCSE-AS informs the BM-SC through the GC2 interface that the GCSE-AS is about to perform the multicast transmission of the group communication service to the unicast transmission.
  • Step 2 The BM-SC sends an MBMS session conversion message to the MBMS-GW through the control plane mechanism to notify the MBMS-GW that the MBMS service needs to perform conversion from multicast transmission to unicast transmission.
  • the MBMS session conversion message may be a new message or an existing MBMS Session Update message is added (ie, an indication information is added to the message).
  • Step 3 The MBMS-GW forwards the MBMS session conversion message or the MBMS Session Update message to the MME to notify the MCE that the MBMS service needs to perform the conversion from the multicast transmission to the unicast transmission; further, the MME forwards the MBMS session conversion message or the MBMS to the MCE. Session Update message.
  • Step 4 The MCE forwards the MBMS session conversion message or the MBMS Session Update message to the eNB or enhances the existing MBMS Counting Request message (ie, adds an indication message to the message) to notify the eNB that the MBMS service needs to be transmitted from the multicast to the Conversion of unicast transmissions.
  • Step 5 After receiving the indication information, the eNB notifies the UE that the MBMS service needs to perform conversion from multicast transmission to unicast transmission; further.
  • the eNB may notify the UE by using any one of the foregoing methods 1 to 4.
  • Step 6 After receiving the indication information sent by the eNB to indicate that the GCSE-AS is about to perform the transition of the MBMS session multicast transmission to the unicast transmission, the UE triggers the establishment process of the unicast EPS bearer for the unicast transmission.
  • Step 7 The UE notifies the GCSE-AS to perform unicast transmission.
  • Step 8 The GCSE-AS then transmits the group communication service on the unicast EPS bearer.
  • Step 9 The UE stops receiving the MBMS service.
  • Step 10 The GCSE-AS stops the MBMS transmission of the group of communication services.
  • the above method processing flow can be implemented by a software program, which can be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
  • the embodiment of the present application further provides a group communication service application server GCSE-AS, and the method for solving the problem by the GCSE-AS and the method for maintaining the continuity of the communication service of the network side shown in FIG. 2 above.
  • the implementation of the GCSE-AS can be referred to the implementation of the method, and the details are not repeated here.
  • the embodiment of the present application provides a group communication service application server GCSE-AS, where the GCSE-AS includes:
  • the first processing module 61 is configured to notify the terminal served by the GCSE-AS when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission, and the GCSE-AS performs the group communication service from the multicast transmission to the unicast. Conversion of transmission;
  • the second processing module 62 is configured to: after receiving the first notification message sent by the terminal, transmit the group communication service on the unicast bearer that is established by the terminal for unicast transmission, and stop sending the group communication by using the multicast mode. business.
  • the sequence in which the second processing module 62 sends the group communication service in the unicast mode and stops the group communication service in the multi-play mode is not limited. Specifically, after receiving the first notification message sent by the terminal, the second processing module 62 may first transmit the group communication service on the unicast bearer, and then stop transmitting the group communication service by using the multicast mode; The broadcast mode sends the group communication service, and then transmits the group communication service on the unicast EPS bearer.
  • the GCSE-AS provided by the embodiment of the present application enables the terminal to establish a unicast transmission when the GCSE-AS switches the group communication service from the multicast transmission to the unicast transmission without changing the existing network architecture.
  • the unicast bearer ensures the continuity of the group communication service.
  • the GCSE-AS may notify the terminal in different manners that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, specifically:
  • the terminal is in an idle state (idle);
  • the first processing module 61 is specifically configured to: send, by using a GC2 interface, a second notification message to the BM-SC, where the second notification message is used to notify the BM-SC that the GCSE-AS will perform group communication services from multiple The conversion of the broadcast to the unicast transmission.
  • the terminal is connected (connected);
  • the first processing module 61 may adopt a scheme in which the terminal is in an idle state, and notify the terminal that the GCSE-AS performs a conversion of the group communication service from the multicast transmission to the unicast transmission, and specifically, the terminal is idle. The description of the state will not be repeated here.
  • the first processing module 61 directly sends a notification message to the terminal it serves to inform the terminal that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • a terminal is also provided in the embodiment of the present application.
  • the method for solving the problem is similar to the method for maintaining the continuity of the communication service on the terminal side shown in FIG. 3, so the implementation of the terminal can be seen.
  • the implementation of the method, the repetition will not be repeated.
  • the present application provides a terminal, where the terminal includes:
  • the first control module 71 is configured to: after receiving the notification that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, trigger the establishment process of the unicast bearer for the unicast transmission;
  • the second control module 72 is configured to send a first notification message to the GCSE-AS, and stop receiving the group communication service sent by the GCSE-AS in a multicast manner, where the first notification message is used to notify the GCSE-AS to perform group communication services. Unicast transmission.
  • the terminal provided in the embodiment of the present application has established a unicast bearer for unicast transmission when the GCSE-AS switches the group communication service from the multicast transmission to the unicast transmission, thereby ensuring the continuity of the group communication service. .
  • the first control module 71 is specifically configured to:
  • the MSI carries indication information for indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the foregoing manner 1 for details);
  • the RRC message sent by the base station to which the terminal belongs is received on the MCCH, where the RRC message carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner).
  • the RRC message carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner). Description of 2);
  • an MBMS Counting Request message sent by the base station to which the terminal belongs, where the MBMS Counting Request message carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission ( For details, refer to the description of the above mode 3);
  • the SIB carries indication information for instructing the GCSE-AS to perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner 4 description).
  • the embodiment of the present application further provides a communication system. As shown in FIG. 8, the system includes:
  • the GCSE-AS 81 is configured to notify the terminal served by the GCSE-AS when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission, and the GCSE-AS performs the group communication service from the multicast transmission to the unicast transmission. And after receiving the first notification message sent by the terminal, transmitting the group communication service on the unicast bearer for the unicast transmission established by the terminal, and stopping transmitting the group communication service by using the multicast mode;
  • the terminal 82 is configured to: after receiving the notification that the GCSE-AS performs the conversion of the group communication service from the multicast transmission to the unicast transmission, trigger a setup process of the unicast bearer used for the unicast transmission; and send the message to the GCSE-AS.
  • the first notification message stops receiving the group communication service by using a multicast mode, and the first notification message is used to notify the GCSE-AS to perform unicast transmission on the group communication service.
  • the system further includes: a BM-SC 83 and a base station 84, wherein:
  • the GCSE-AS 81 is specifically configured to: send, by using a GC2 interface, a second notification message to the BM-SC, where the second notification message is used to notify the BM-SC that the GCSE-AS transmits the group communication service from multicast to unicast. Conversion of transmission;
  • the BM-SC 83 is specifically configured to: after receiving the second notification message, send data carrying the SYNC information to the base station, where the SYNC information is used to indicate that the GCSE-AS performs the group communication service from the multicast transmission to the unicast transmission. Indication of the conversion;
  • the base station 84 is specifically configured to: after receiving the data carrying the SYNC information, notify the terminal served by the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the BM-SC notifies the E-UTRAN side device through the user plane mechanism that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the system further includes: a BM-SC 83, an MBMS gateway 85, an MME 86, an MCE 87, and a base station 84, where:
  • the GCSE-AS 81 is specifically configured to: send, by using a GC2 interface, a second notification message to the BM-SC, where the second notification message is used to notify the BM-SC that the GCSE-AS transmits the group communication service from multicast to unicast. Conversion of transmission;
  • the BM-SC 83 is specifically configured to: after receiving the second notification message, send the first MBMS session to the MBMS gateway. Transmitting a message to inform the MBMS gateway that the GCSE-AS will perform a conversion of the group communication service from multicast transmission to unicast transmission;
  • the MBMS gateway 85 is specifically configured to: after receiving the first MBMS session conversion message, send a second MBMS session conversion message to the MME to notify the MME that the GCSE-AS converts the group communication service from multicast transmission to unicast transmission. ;
  • the MME 86 is specifically configured to: after receiving the second MBMS session conversion message, send a third MBMS session conversion message to the MCE, to notify the MCE that the GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission;
  • the MCE 87 is specifically configured to: after receiving the third MBMS session conversion message, send a fourth MBMS session conversion message to the base station to notify the base station that the GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission;
  • the base station 84 is specifically configured to: after receiving the fourth MBMS session conversion message, notify the terminal served by the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the first MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the network side method for details). The description of some parts will not be repeated here);
  • the second MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the network side method part, not here) Further details);
  • the third MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the network side method part, not here) Further details);
  • the fourth MBMS session conversion message is an MBMS session update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission; or the fourth MBMS session conversion message is carried for An MBMS Counting Request message indicating that the GCSE-AS will perform the indication of the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the network side method part, and details are not described herein again).
  • the base station 84 is specifically configured to:
  • the MSI carrying the conversion for indicating that the GCSE-AS will perform the group communication service from the multicast transmission to the unicast transmission.
  • Indication information (refer to the description of Mode 1 above); or,
  • the RRC message is used to notify the terminal served by the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and the RRC message carries the indication that the GCSE-AS will perform the group communication service. Indication of conversion from multicast transmission to unicast transmission (refer to the description of mode 2 above); or
  • the MBMS Counting Request message is sent to the MCCH to notify the terminal served by the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and the MBMS counting request message is carried in the indication.
  • the GCSE-AS will perform indication of the conversion of the group communication service from multicast transmission to unicast transmission (refer to the description of mode 3 above); or
  • the SIB carries the indication that the GCSE-AS will perform the group communication service from the multicast transmission to The indication of the conversion of the unicast transmission (refer to the description of the mode 4 above).
  • GCSE-AS 9 includes a transceiver 91 and at least one processor 92 coupled to the transceiver 91, wherein:
  • the processor 92 is configured for the GCSE-AS to trigger the transceiver 91 to notify the terminal served by the GCSE-AS that the GCSE-AS will perform group communication when determining that the group communication service needs to be switched from the multicast transmission to the unicast transmission.
  • the transceiver 91 is configured to: receive a first notification message sent by the terminal; the processor 92 is further configured to transmit the group communication service on the unicast bearer that the terminal has established for unicast transmission, and stop adopting Multicast mode sends group communication services.
  • the transceiver 91 is configured to: send a second notification message to the BM-SC through the GC2 interface, where the second notification message is used to notify the BM-SC that the GCSE-AS will perform group communication services from multiple The conversion of the broadcast to the unicast transmission.
  • the BM-SC 10 includes a transceiver 101 and at least one processor 102 coupled to the transceiver 101, wherein:
  • the transceiver 101 is configured to: receive a second notification message sent by the GCSE-AS;
  • the processor 102 is configured to: according to the second notification message, determine that the GCSE-AS is about to perform a conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver 101 to pass the user plane mechanism or the control plane mechanism. Notifying the E-UTRAN side device that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the first mode of the transceiver 101 is configured to: send data carrying the SYNC information to the base station, where the SYNC information carries a conversion for instructing the GCSE-AS to perform the group communication service from the multicast transmission to the unicast transmission.
  • SYNC information carries a conversion for instructing the GCSE-AS to perform the group communication service from the multicast transmission to the unicast transmission.
  • the second mode of the transceiver 101 is configured to: send a first MBMS session conversion message to the MBMS gateway to notify the MBMS gateway that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the first MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the first MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, that is, the BM-SC adopts the pair.
  • the existing MBMS Session Update message is extended to inform the MBMS gateway that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the MBMS gateway 11 includes a transceiver 111 and at least one processor 112 coupled to the transceiver 111, wherein:
  • the transceiver 111 is configured to: receive a first MBMS session conversion message sent by the BM-SC;
  • the processor 112 is configured to: according to the first MBMS session conversion message, determine that the GCSE-AS is about to perform a conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver 111 to send the second MBMS to the MME.
  • the session converts the message to inform the MME that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the second MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the second MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, that is, the MBMS gateway adopts the existing MBMS.
  • the Session Update message is extended to inform the MME that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the MME 12 includes a transceiver 121 and at least one processor 122 coupled to the transceiver 121, wherein:
  • the transceiver 121 is configured to: receive a second MBMS session conversion message sent by the MBMS gateway;
  • the processor 122 is configured to: according to the second MBMS session conversion message, determine that the GCSE-AS is about to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver 121 to send the third MBMS to the MME.
  • the session converts the message to inform the MCE that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the third MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the third MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission, that is, the MME adopts the existing MBMS Session.
  • the Update message is extended to inform the MCE that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • MCE 13 includes a transceiver 131 and at least one processor 132 coupled to the transceiver 131, wherein:
  • the transceiver 131 is configured to: receive a third MBMS session conversion message sent by the MME;
  • the processor 132 is configured to: according to the third MBMS session conversion message, determine that the GCSE-AS is about to perform the conversion of the group communication service from the multicast transmission to the unicast transmission, and trigger the transceiver 131 to send the fourth MBMS to the base station.
  • the session converts the message to inform the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • the fourth MBMS session conversion message may be new signaling, or may be extended to existing signaling.
  • the fourth MBMS session conversion message is an MBMS Session Update message carrying indication information indicating that the GCSE-AS will perform the group communication service from the multicast transmission to the unicast transmission, that is, the MCE adopts the pair.
  • the existing MBMS Session Update message is extended to inform the base station that the GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the fourth MBMS session conversion message is an MBMS Counting Request (MBMS Counting Request) carrying indication information indicating that the GCSE-AS will perform a group communication service from multicast transmission to unicast transmission.
  • the message that is, the MCE, extends the existing MBMS Counting Request message to inform the base station that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission.
  • base station 14 includes a transceiver 141 and at least one processor 142 coupled to the transceiver 141, wherein:
  • the BM-SC After receiving the second notification message, the BM-SC notifies the E-UTRAN side device that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission through the user plane mechanism:
  • the transceiver 141 is configured to: receive data carried by the BM-SC and carrying the SYNC information;
  • the processor 142 is configured to: determine, according to the data carrying the SYNC information, that the GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission, and triggers the transceiver 141 to notify the base station to serve Terminal The GCSE-AS will perform the conversion of group communication services from multicast transmission to unicast transmission.
  • the transceiver 141 may notify the terminal GCSE-AS served by the base station to convert the group communication service from multicast transmission to unicast transmission by using any one of the foregoing manners 1 to 4.
  • the transceiver 141 may notify the terminal GCSE-AS served by the base station to convert the group communication service from multicast transmission to unicast transmission by using any one of the foregoing manners 1 to 4.
  • the BM-SC After receiving the second notification message, the BM-SC notifies the E-UTRAN side device that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission through the control plane mechanism:
  • the transceiver 141 is configured to: receive a fourth MBMS session conversion message sent by the MCE;
  • the processor 142 is configured to: according to the fourth MBMS session conversion message, determine that the GCSE-AS converts the group communication service from the multicast transmission to the unicast transmission, and triggers the transceiver 141 to notify the base station to serve The terminal GCSE-AS will perform the conversion of the group communication service from multicast transmission to unicast transmission.
  • the transceiver 141 may notify the terminal GCSE-AS served by the base station to convert the group communication service from multicast transmission to unicast transmission by using any one of the foregoing manners 1 to 4.
  • the transceiver 141 may notify the terminal GCSE-AS served by the base station to convert the group communication service from multicast transmission to unicast transmission by using any one of the foregoing manners 1 to 4.
  • terminal 15 includes a transceiver 151 and at least one processor 152 coupled to the transceiver 151, wherein:
  • the transceiver 151 is configured to: receive a notification that the GCSE-AS will perform a conversion of the group communication service from the multicast transmission to the unicast transmission;
  • the processor 152 is configured to: trigger a setup process of a unicast bearer for unicast transmission, and trigger the transceiver 151 to send a first notification message to the GCSE-AS, and stop receiving the GCSE-AS transmission in a multicast manner.
  • the group communication service is used to notify the GCSE-AS to perform unicast transmission on the group communication service.
  • the transceiver 151 is configured to specifically:
  • the MSI carries indication information for indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the description of the foregoing manner 1 for details); or,
  • the RRC message sent by the base station to which the terminal belongs is received on the MCCH, where the RRC message carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner). Description of 2); or,
  • an MBMS Counting Request message sent by the base station to which the terminal belongs, where the MBMS Counting Request message carries indication information indicating that the GCSE-AS will perform the conversion of the group communication service from the multicast transmission to the unicast transmission ( For details, refer to the description of the above mode 3); or,
  • the SIB carries indication information for instructing the GCSE-AS to perform the conversion of the group communication service from the multicast transmission to the unicast transmission (refer to the foregoing manner 4 description).
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the device is implemented in a flow or a flow or a block diagram of a block or multiple The function specified in the box.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请公开了一种保持组通信业务连续性的方法、装置和系统，用于解决现有当网络将业务在MBSFN域的多播传输切换到单播传输后，可能导致的无法满足组通信对业务连续性要求的问题。方法包括：GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；GCSE-AS在接收到终端发送的第一通知消息后，在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。由于GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。

Description

一种保持组通信业务连续性的方法、装置和系统
本申请要求在2013年12月25日提交中国专利局、申请号为201310728776.0、发明名称为“一种保持组通信业务连续性的方法、装置和系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别涉及一种保持组通信业务连续性的方法、装置和系统。
背景技术
组通信是指网络同时向归属于该组的多个终端传输业务数据的通信方式。组通信的网络架构如图1所示，该网络架构中各个接口功能如下：
M3接口：在移动管理实体(Mobility Management Entity，MME)和多小区/多播协调实体(Multi-cell/Multicast Coordination Entity，MCE)之间提供会话(Session)管理相关功能，比如session start(会话开始)、session stop(会话停止)通知；
M2接口：在MCE和演进型基站(Evolved Node B，eNB)之间提供会话管理、传递多媒体广播多播业务(Multimedia Broadcast Multicast Service，MBMS)调度信息等功能；
M1接口：在MBMS网关(Gateway，GW)和eNB之间提供MBMS业务传输；
GC1接口:用户设备(User Equipment，UE，又称终端)和组通信业务应用服务器(Group Communication Service Enabler Application Server，GCSE AS)之间的接口，用于定义GCSE相关功能的业务层行令，比如会话建立，流量控制等；
GC2接口：提供广播-多播服务中心(Broadcast Multicast-Service Centre，BM-SC)和GCSE AS之间的交互功能；
SGi-mb接口：BM-SC和MBMS GW的用户平面接口；
SGmb接口：BM-SC和MBMS GW的控制平面接口。
组通信方式下，根据组通信中终端角色的不同，可以将组通信终端划分为两类：一是发送终端，即被组通信服务器授权可以向组通信服务器发送组通信数据的终端，发送终端和组通信服务器之间的上行数据通过单播方式传输；二是接收终端，即被组通信服务器授权可以接收该组通信服务器下发的组通信数据的终端，接收终端可以通过单播或者多播方式从网络接收组通信数据。
对于长期演进(Long Term Evolution，LTE)系统的组通信业务，在用户设备数目比较少的情况下，网络侧(即GCSE-AS)可以使用LTE单播演进型分组系统(Evolved Packet  System，EPS)承载进行业务传输；在用户设备数目较多的场景下，网络侧可以使用现有的MBMS网络，广播该组通信业务。为了有效利用网络资源，网络侧可以根据设定的策略，执行多播传输与单播传输之间的切换。例如，若一个小区(cell)下接收某个组通信业务的用户设备数目减少，网络可以将该业务在相关单频网(MBMS Single Frequency Network，MBSFN)域的多播传输切换到单播传输。
然而，当网络将业务在相关MBSFN域的多播传输切换到单播传输后，由于用户设备没有建立合适的单播EPS承载，网络将无法在单播EPS承载上传输该组通信业务，从而导致组通信从多播传输切换到单播传输的过程中，组通信业务中断时间较长，无法满足组通信对业务连续性的要求。
发明内容
本申请实施例提供了一种保持组通信业务连续性的方法、装置和系统，用于解决现有技术中存在的当网络将业务在相关MBSFN域的多播传输切换到单播传输后，可能导致的无法满足组通信对业务连续性要求的问题。
本申请实施例提供了一种保持组通信业务连续性的方法，包括：
GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，通知所述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述GCSE-AS在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务。
本申请实施例在不改变现有网络架构的情况下，使得GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，所述GCSE-AS通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，包括：
所述GCSE-AS通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
进一步，该方法还包括：
所述BM-SC在接收到所述第二通知消息后，向基站发送携带有同步(Synchronization，SYNC)信息的数据，所述SYNC信息中携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述BM-SC在接收到所述第二通知消息后，向MBMS网关发送第一MBMS会话转换消息，以通知所述MBMS网关所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
优选的，所述第一MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
进一步，该方法还包括：所述MBMS网关在接收到所述第一MBMS会话转换消息后，向MME发送第二MBMS会话转换消息，以通知所述MME所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
优选的，所述第二MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
进一步，所述方法还包括：所述MME在接收到所述第二MBMS会话转换消息后，向MCE发送第三MBMS会话转换消息，以通知所述MCE所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
优选的，所述第三MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
进一步，所述方法还包括：所述MCE在接收到所述第三MBMS会话转换消息后，向基站发送第四MBMS会话转换消息，以通知所述基站所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
优选的，所述第四MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；或者，
所述第四MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求消息。
基于上述BM-SC的两种通知方式，进一步，所述方法还包括：
所述基站在接收到携带有所述SYNC信息的数据或所述第四MBMS会话转换消息之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
在实施中，所述基站通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，包括：
所述基站通过多播信道调度信息(MCH Scheduling Information，MSI；Multicast Channel，MCH)，通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述基站在多播控制信道(Multicast Control Channel，MCCH)上通过无线资源控制 (Radio Resource Control，RRC)消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述基站在MCCH上通过MBMS计数请求消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述基站通过广播系统消息块(System Information Block，SIB)，通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
优选的，所述SIB为SIB13或SIB15。
基于同一发明构思，本申请实施例还提供了一种保持组通信业务连续性的方法，包括：
终端接收到GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；
所述终端向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述GCSE-AS对所述组通信业务进行单播传输。
本申请实施例中，由于在GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，终端接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知，包括：
所终端接收所述终端所属的基站发送的MSI，其中，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述终端在MCCH上接收所述终端所属的基站发送的RRC消息，其中，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述终端在MCCH上接收所述终端所属的基站发送的MBMS计数请求消息，其中，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
所述终端在MCCH上接收所述终端所属的基站发送的SIB，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
优选的，所述SIB为SIB13或SIB15。
基于同一发明构思，本申请实施例还提供了一种GCSE-AS，包括：
第一处理模块，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知所 述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
第二处理模块，用于在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务。
在实施中，所述第一处理模块具体用于：
通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
基于同一发明构思，本申请实施例还提供了一种终端，包括：
第一控制模块，用于收到GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；
第二控制模块，用于向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述GCSE-AS对所述组通信业务进行单播传输。
在实施中，所述第一控制模块具体用于：
接收所述终端所属的基站发送的MSI，其中，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收所述终端所属的基站发送的RRC消息，其中，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收所述终端所属的基站发送的MBMS计数请求消息，其中，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收所述终端所属的基站发送的SIB，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
基于同一发明构思，本申请实施例还提供了一种通信系统，包括：
GCSE-AS，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知所述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；以及，在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务；
终端，用于收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；以及，向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述 GCSE-AS对所述组通信业务进行单播传输。
作为一种优选的实现方式，该系统进一步还包括：BM-SC和基站，其中：
所述GCSE-AS还用于：通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述BM-SC具体用于：在接收到所述第二通知消息后，向基站发送携带有SYNC信息的数据，所述SYNC信息中携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；
所述基站具体用于：在接收到携带有所述SYNC信息的数据之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
作为另一种优选的实现方式，该系统进一步还包括：BM-SC、MBMS网关、MME、MCE和基站，其中：
所述GCSE-AS还用于：通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述BM-SC具体用于：在接收到所述第二通知消息后，向所述MBMS网关发送第一MBMS会话转换消息，以通知所述MBMS网关所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述MBMS网关具体用于：在接收到所述第一MBMS会话转换消息后，向所述MME发送第二MBMS会话转换消息，以通知所述MME所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述MME具体用于：在接收到所述第二MBMS会话转换消息后，向所述MCE发送第三MBMS会话转换消息，以通知所述MCE所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述MCE具体用于：在接收到所述第三MBMS会话转换消息后，向所述基站发送第四MBMS会话转换消息，以通知所述基站所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
所述基站具体用于：在接收到所述第四MBMS会话转换消息之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
优选的，所述第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
所述第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
所述第三MBMS会话转换消息为携带有用于所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
所述第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；或者，所述第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求消息。
基于上述两种优选的实现方式，所述基站具体用于：
通过MSI通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上通过RRC消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上通过MBMS计数请求消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
通过SIB通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
基于同一发明构思，本申请实施例还提供了一种GCSE-AS，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
处理器被配置用于GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，触发收发信机通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
收发信机被配置用于：接收终端发送的第一通知消息；处理器还被配置用于在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。
进一步，收发信机被配置具体用于:通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
基于同一发明构思，本申请实施例还提供了一种BM-SC包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置用于：接收GCSE-AS发送的第二通知消息；
处理器被配置用于：根据该第二通知消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机向基站发送携带有SYNC信息的数据，该SYNC信息中携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息；或者触发收发信机向MBMS网关发送第一MBMS会话转换消息，以通知该MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
优选的，第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
基于同一发明构思，本申请实施例还提供了一种MBMS网关，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置用于：接收BM-SC发送的第一MBMS会话转换消息；
处理器被配置用于：根据该第一MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机向MME发送第二MBMS会话转换消息，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
优选的，第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
基于同一发明构思，本申请实施例还提供了一种MME，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置用于：接收MBMS网关发送的第二MBMS会话转换消息；
处理器被配置用于：根据该第二MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机向MME发送第三MBMS会话转换消息，以通知MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
优选的，第三MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
基于同一发明构思，本申请实施例还提供了一种MCE，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置用于：接收MME发送的第三MBMS会话转换消息；
处理器被配置用于：根据该第三MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机向基站发送第四MBMS会话转换消息，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
优选的，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息，或者，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的 指示信息的MBMS计数请求消息。
基于同一发明构思，本申请实施例还提供了一种基站，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置具体用于：接收BM-SC发送的携带有SYNC信息的数据或者，接收MCE发送的第四MBMS会话转换消息；
处理器被配置具体用于：根据携带有SYNC信息的数据或者第四MBMS会话转换消息，判断出GCSE-AS将进行组通信业务从多播传输到单播传输的转换，并触发收发信机通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，收发信机被配置具体用于：
通过MSI通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上通过RRC消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上通过MBMS计数请求消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
通过SIB通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
优选的，所述SIB为SIB13或SIB15。
基于同一发明构思，本申请实施例还提供了一种终端，包括收发信机、以及与该收发信机连接的至少一个处理器，其中：
收发信机被配置用于：接收GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知；
处理器被配置用于：触发用于单播传输的单播承载的建立过程，并触发收发信机向GCSE-AS发送第一通知消息，以及停止采用多播方式接收GCSE-AS发送的组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。
具体的，收发信机被配置具体用于：
接收该终端所属的基站发送的MSI，其中，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收该终端所属的基站发送的RRC消息，其中，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收该终端所属的基站发送的MBMS计数请求消息，其中，该MBMS计数请求消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息；或者，
在MCCH上接收该终端所属的基站发送的SIB，其中，该SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
附图说明
图1为背景技术中组通信的网络架构的示意图；
图2为本申请提供的网络侧保持组通信业务连续性的方法的示意图；
图3为本申请提供的终端侧保持组通信业务连续性的方法的示意图；
图4为本申请提供的实施例一的流程示意图；
图5为本申请提供的实施例二的流程示意图；
图6为本申请提供的一种GCSE-AS的结构示意图；
图7为本申请提供的一种终端的结构示意图；
图8为本申请实施例提供的通信系统的结构示意图；
图9为本申请提供的另一种GCSE-AS的结构示意图；
图10为本申请提供的BM-SC的结构示意图；
图11为本申请提供的MBMS网关的结构示意图；
图12为本申请提供的MME的结构示意图；
图13为本申请提供的MCE的结构示意图；
图14为本申请提供的基站的结构示意图；
图15为本申请提供的另一种终端的结构示意图。
具体实施方式
下面结合说明书附图对本申请实施例作进一步详细描述。应当理解，此处所描述的实施例仅用于说明和解释本申请，并不用于限定本申请。
参见图2所示，本申请实施例提供了网络侧保持组通信业务连续性的方法，该方法包括以下步骤：
步骤21、GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
步骤22、GCSE-AS在接收到终端发送的第一通知消息后，在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。
本步骤中不对采用单播方式发送组通信业务和停止采用多播放方式发送组通信业务的先后顺序进行限定。具体的，GCSE-AS在接收到终端发送的第一通知消息后，可以先在该单播承载上传输组通信业务，再停止采用多播方式发送组通信业务；也可以先停止采用多播方式发送组通信业务，再在该单播EPS承载上传输组通信业务。
本申请实施例中，GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；以及，GCSE-AS在接收到终端发送的第一通知消息后，在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。本申请实施例在不改变现有网络架构的情况下，使得GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，根据终端当前的状态不同，GCSE-AS可以采用不同的方式通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体为：
一、终端处于空闲态(idle)；
步骤21中，GCSE-AS通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体包括：
GCSE-AS通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
进一步，BM-SC在接收到该第二通知消息后，可以通过用户面机制或控制面机制，通知演进通用移动通信系统陆地无线接入网(Evolved UMTS Terrestrial Radio Access Network，E-UTRAN；Universal Mobile Telecommunications System，UMTS)侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
方式一、BM-SC在接收到该第二通知消息后，通过用户面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体包括：
BM-SC向基站发送携带有SYNC信息的数据，该SYNC信息中携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
优选的，可以通过扩展现有SYNC信息中的协议数据单元(Protocol Data Unit，PDU)类型(TYPE)的预留值(如PDU TYPE＝4)来指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息，如下表所示：
Figure PCTCN2014094744-appb-000001
当然，除了上述方式，也可以在现有SYNC信息中增加一个用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的指示信息。
该方式下，基站在接收到携带有SYNC信息的数据之后，判断出GCSE-AS将进行组通信业务从多播传输到单播传输的转换，进一步，该基站通知其所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，基站通知其服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，包括以下几种方式：
方式1、基站通过MCH，通知终端该GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
该方式下，基站通过对现有MSI进行扩展，以通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。具体的，基站可以通过MSI中的预留值来指示终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
方式2、基站在MCCH上，通过RRC消息，通知该基站所服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，其中，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
该方式下，基站通过新的RRC消息以通知终端该GCSE-AS将进行组通信业务从多播 传输到单播传输的转换。
方式3、基站在MCCH上通过MBMS计数请求消息，通知该基站所服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，其中，该MBMS计数请求(MBMS Counting Request)消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
该方式下，基站通过对现有的MBMS计数请求消息进行扩展，即在现有的MBMS计数请求消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息，以通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
方式4、基站通过SIB，通知终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，其中，该SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息。
该方式下，基站可以通过扩展现有的SIB，即在现有的SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息，以通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；也可以通过新的SIB通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
优选的，基站可以通过扩展现有的SIB13或SIB15，在该SIB13或SIB15中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息，并通过广播方式，通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
需要说明的是，基站可以采用以上任一方式通知其所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
方式二、BM-SC在接收到该第二通知消息后，通过控制面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体包括：
BM-SC在接收到第二通知消息后，向MBMS网关发送第一MBMS会话转换消息，以通知该MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第一MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新(MBMS Session Update)消息，即BM-SC采用对现有的MBMS Session Update消息进行扩展，以通知MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
进一步，MBMS网关在接收到该第一MBMS会话转换消息后，向MME发送第二MBMS会话转换消息，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第二MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新(MBMS Session Update)消息，即MBMS网关采用对现有的MBMS Session Update消息进行扩展，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
进一步，MME在接收到该第二MBMS会话转换消息后，向MCE发送第三MBMS会话转换消息，以通知该MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第三MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第三MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即MME采用对现有的MBMS Session Update消息进行扩展，以通知MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
进一步，MCE在接收到该第三MBMS会话转换消息后，向基站发送第四MBMS会话转换消息，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第四MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
作为一种优选的实现方式，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即MCE采用对现有的MBMS Session Update消息进行扩展，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
作为另一种优选的实现方式，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求(MBMS Counting Request)消息，即MCE采用对现有的MBMS Counting Request消息进行扩展，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
进一步，基站在接收到该第四MBMS会话转换消息之后，判断出GCSE-AS将进行组通信业务从多播传输到单播传输的转换，进一步，该基站通知其所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，基站采用上述方式1～方式4中任一方式通知其服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体参见方式一中的描述，此处不再赘述。
二、终端处于连接态(connected)；
作为一种优选的实现方式，GCSE-AS可以采用上述终端处于空闲态的方案，通知终端 该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体参见终端处于空闲态的描述，此处不再赘述。
作为另一种优选的实现方式，GCSE-AS直接向其所服务的终端发送通知消息，以通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
基于同一发明构思，本申请实施例还提供了终端侧保持组通信业务连续性的方法，参见图3所示，该方法包括以下步骤：
步骤31、终端接收到GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程。
本步骤中，终端使用用于多播传输的MBMS承载接收组通信业务，该终端当前可以是空闲态，也可以是连接态；终端在接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，得知组通信业务将进行从多播传输到单播传输的转换，因此，该终端触发用于单播传输的单播承载(如EPS承载)的建立过程。
步骤32、终端向GCSE-AS发送第一通知消息，并停止采用多播方式接收GCSE-AS发送的组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。
本步骤中，终端在建立了单播承载之后，通知GCSE-AS进行单播传输，此后，终端停止采用多播方式接收GCSE-AS发送的组通信业务。
本申请实施例中，终端接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；以及，终端向GCSE-AS发送第一通知消息，并停止采用多播方式接收GCSE-AS发送的组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。由于在GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，步骤31中，终端接收到GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知，具体包括：
终端接收该终端所属的基站发送的MSI，其中，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式1的描述)；
或者，
终端在MCCH上接收该终端所属的基站发送的RRC消息，其中，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式2的描述)；
或者，
终端在MCCH上接收该终端所属的基站发送的MBMS计数请求消息，其中，该MBMS计数请求消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换 的指示信息(具体参见上述方式3的描述)；
或者，
终端在MCCH上接收该终端所属的基站发送的SIB，其中，该SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式4的描述)。
下面通过两个具体实施例，对本申请提供的保持组通信业务连续性的方法中各实体之间的交互过程进行详细说明。
实施例一、本实施例中，BM-SC通过用户面SYNC协议机制，发送MBMS会话多播/单播传输转换信息，具体流程参见图4所示，包括以下步骤：
步骤0：UE使用MBMS承载接收组通信业务，UE可以处于空闲态或者连接态。
步骤1：GCSE-AS通过GC2接口，通知BM-SC该GCSE-AS即将进行组通信业务的多播传输到单播传输的转换。
步骤2：BM-SC通过增强用户面SYNC协议的SYNC信息(比如使用新的PDUTYPE＝4)，指示eNB该GCSE-AS即将进行MBMS会话从多播传输到单播传输的转换。
步骤3：eNB接收到携带有SYNC信息的数据包后，判断GCSE-AS即将进行MBMS会话从多播传输到单播传输转换，该eNB将通知UE该GCSE-AS即将进行MBMS会话从多播传输到单播传输的转换。
具体的，eNB可以采用上述方式1～方式4中的任一方式通知UE。
步骤4：UE接收到eNB发送的用于指示该GCSE-AS即将进行MBMS会话多播传输到单播传输的转换的指示信息后，触发用于单播传输的单播EPS承载的建立过程。
步骤5：UE直接通知GCSE-AS进行单播传输。
步骤6：GCSE-AS接收到UE的通知后，在该UE已建立的单播EPS承载上传输组通信业务。
步骤7：UE停止接收MBMS业务，即UE停止通过多播方式接收组通信业务。
步骤8：GCSE-AS停止该组通信业务的MBMS传输，即GCSE-AS停止通过多播方式向UE发送组通信业务。
实施例二、本实施例中，BM-SC通过控制面机制，发送MBMS会话多播/单播传输转换信息，具体流程参见图5所示，包括以下步骤：
步骤0：UE使用MBMS承载接收组通信业务，UE可以处于空闲态或者连接态。
步骤1：GCSE-AS通过GC2接口，通知BM-SC该GCSE-AS即将进行组通信业务的多播传输到单播传输的转换。
步骤2：BM-SC通过控制面机制，向MBMS-GW发送MBMS会话转换消息，通知MBMS-GW该MBMS业务需要进行从多播传输到单播传输的转换。
其中，该MBMS会话转换消息可以是一条新的消息，或者增强现有MBMS Session Update消息(即在该消息中增加一个指示信息)。
步骤3：MBMS-GW向MME前传MBMS会话转换消息或者MBMS Session Update消息，以通知MCE该MBMS业务需要进行从多播传输到单播传输的转换；进一步，MME向MCE前传MBMS会话转换消息或者MBMS Session Update消息。
步骤4：MCE向eNB前传MBMS会话转换消息或者MBMS Session Update消息或者增强现有的MBMS Counting Request消息(即在该消息中增加一个指示信息)，以通知eNB该MBMS业务需要进行从多播传输到单播传输的转换。
步骤5：eNB接收到指示信息后，eNB通知UE该MBMS业务需要进行从多播传输到单播传输的转换；进一步，。
具体的，eNB可以采用上述方式1～方式4中的任一方式通知UE。
步骤6：UE接收到eNB发送的用于指示该GCSE-AS即将进行MBMS会话多播传输到单播传输的转换的指示信息后，触发用于单播传输的单播EPS承载的建立过程。
步骤7：UE通知GCSE-AS进行单播传输。
步骤8：GCSE-AS随后在该单播EPS承载上传输组通信业务。
步骤9：UE停止接收MBMS业务。
步骤10：GCSE-AS停止该组通信业务的MBMS传输。
上述方法处理流程可以用软件程序实现，该软件程序可以存储在存储介质中，当存储的软件程序被调用时，执行上述方法步骤。
基于同一发明构思，本申请实施例中还提供了一种组通信业务应用服务器GCSE-AS，由于该GCSE-AS解决问题的原理与上述图2所示的网络侧保持组通信业务连续性的方法相似，因此该GCSE-AS的实施可以参见方法的实施，重复之处不再赘述。
参见图6所示，本申请实施例提供了一种组通信业务应用服务器GCSE-AS，该GCSE-AS包括：
第一处理模块61，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
第二处理模块62，用于在接收到终端发送的第一通知消息后，在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。
本申请实施例中，不对第二处理模块62采用单播方式发送组通信业务和停止采用多播放方式发送组通信业务的先后顺序进行限定。具体的，第二处理模块62在接收到终端发送的第一通知消息后，可以先在该单播承载上传输组通信业务，再停止采用多播方式发送组通信业务；也可以先停止采用多播方式发送组通信业务，再在该单播EPS承载上传输组通信业务。
本申请实施例提供的GCSE-AS，在不改变现有网络架构的情况下，使得GCSE-AS将组通信业务从多播传输切换到单播传输时，终端已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，根据终端当前的状态不同，GCSE-AS可以采用不同的方式通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体为：
一、终端处于空闲态(idle)；
具体的，第一处理模块61具体用于：通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
二、终端处于连接态(connected)；
作为一种优选的实现方式，第一处理模块61可以采用上述终端处于空闲态的方案，通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体参见终端处于空闲态的描述，此处不再赘述。
作为另一种优选的实现方式，第一处理模块61直接向其所服务的终端发送通知消息，以通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
基于同一发明构思，本申请实施例中还提供了一种终端，由于该终端解决问题的原理与上述图3所示的终端侧保持组通信业务连续性的方法相似，因此该终端的实施可以参见方法的实施，重复之处不再赘述。
参见图7所示，本申请是所提供了一种终端，该终端包括：
第一控制模块71，用于接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；
第二控制模块72，用于向GCSE-AS发送第一通知消息，并停止采用多播方式接收GCSE-AS发送的组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。
本申请实施例中提供的终端接在GCSE-AS将组通信业务从多播传输切换到单播传输时，已建立了用于单播传输的单播承载，从而保证了组通信业务的连续性。
在实施中，第一控制模块71具体用于：
接收该终端所属的基站发送的MSI，其中，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式1的描述)；
或者，
在MCCH上接收该终端所属的基站发送的RRC消息，其中，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式2的描述)；
或者，
在MCCH上接收该终端所属的基站发送的MBMS计数请求消息，其中，该MBMS计数请求消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式3的描述)；
或者，
在MCCH上接收该终端所属的基站发送的SIB，其中，该SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式4的描述)。
基于同一发明构思，本申请实施例还提供了一种通信系统，参见图8所示，该系统包括：
GCSE-AS81，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；以及，在接收到终端发送的第一通知消息后，在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务；
终端82，用于收到GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；以及，向GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。
作为一种优选的实现方式，该系统还包括：BM-SC83和基站84，其中：
GCSE-AS81具体用于：通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
BM-SC83具体用于：在接收到第二通知消息后，向基站发送携带有SYNC信息的数据，该SYNC信息中携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息；
基站84具体用于：在接收到携带有SYNC信息的数据之后，通知基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
该方式下，BM-SC通过用户面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
作为另一种优选的实现方式，该系统还包括：BM-SC83、MBMS网关85、MME86、MCE87和基站84，其中：
GCSE-AS81具体用于：通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
BM-SC83具体用于：在接收到第二通知消息后，向MBMS网关发送第一MBMS会话 转换消息，以通知MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
MBMS网关85具体用于：在接收到第一MBMS会话转换消息后，向MME发送第二MBMS会话转换消息，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
MME86具体用于：在接收到第二MBMS会话转换消息后，向MCE发送第三MBMS会话转换消息，以通知MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
MCE87具体用于：在接收到第三MBMS会话转换消息后，向基站发送第四MBMS会话转换消息，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
基站84具体用于：在接收到第四MBMS会话转换消息之后，通知基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
该方式下，优选的，第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息(具体参见网络侧方法部分的描述，此处不再赘述)；
第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息(具体参见网络侧方法部分的描述，此处不再赘述)；
第三MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息(具体参见网络侧方法部分的描述，此处不再赘述)；
第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；或者，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求消息(具体参见网络侧方法部分的描述，此处不再赘述)。
基于上述两种优选的实现方式，基站84具体用于：
通过MSI通知终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式1的描述)；或者，
在MCCH上通过RRC消息，通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式2的描述)；或者，
在MCCH上通过MBMS计数请求消息，通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示 GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式3的描述)；或者，
通过SIB通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，其中，SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式4的描述)。
下面结合优选的硬件结构，对本申请实施例提供的通信系统中的各实体的结构、处理方式进行说明。
参见图9所示，GCSE-AS9包括收发信机91、以及与该收发信机91连接的至少一个处理器92，其中：
处理器92被配置用于GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，触发收发信机91通知该GCSE-AS所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换；
收发信机91被配置用于：接收终端发送的第一通知消息；处理器92还被配置用于在该终端已建立的用于单播传输的单播承载上传输组通信业务，且停止采用多播方式发送组通信业务。
进一步，收发信机91被配置具体用于:通过GC2接口，向BM-SC发送第二通知消息，其中，该第二通知消息用于通知BM-SC该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
参见图10所示，BM-SC10包括收发信机101、以及与该收发信机101连接的至少一个处理器102，其中：
收发信机101被配置用于：接收GCSE-AS发送的第二通知消息；
处理器102被配置用于：根据该第二通知消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机101通过用户面机制或控制面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
方式一、收发信机101被配置具体用于：向基站发送携带有SYNC信息的数据，该SYNC信息中携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息，具体参见方法部分中的方式一的描述。
方式二、收发信机101被配置具体用于：向MBMS网关发送第一MBMS会话转换消息，以通知该MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第一MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即BM-SC采用对 现有的MBMS Session Update消息进行扩展，以通知MBMS网关该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
参见图11所示，MBMS网关11包括收发信机111、以及与该收发信机111连接的至少一个处理器112，其中：
收发信机111被配置用于：接收BM-SC发送的第一MBMS会话转换消息；
处理器112被配置用于：根据该第一MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机111向MME发送第二MBMS会话转换消息，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第二MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即MBMS网关采用对现有的MBMS Session Update消息进行扩展，以通知MME该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
参见图12所示，MME12包括收发信机121、以及与该收发信机121连接的至少一个处理器122，其中：
收发信机121被配置用于：接收MBMS网关发送的第二MBMS会话转换消息；
处理器122被配置用于：根据该第二MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机121向MME发送第三MBMS会话转换消息，以通知MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第三MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
优选的，第三MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即MME采用对现有的MBMS Session Update消息进行扩展，以通知MCE该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
参见图13所示，MCE13包括收发信机131、以及与该收发信机131连接的至少一个处理器132，其中：
收发信机131被配置用于：接收MME发送的第三MBMS会话转换消息；
处理器132被配置用于：根据该第三MBMS会话转换消息，判断出GCSE-AS即将进行组通信业务从多播传输到单播传输的转换，并触发收发信机131向基站发送第四MBMS 会话转换消息，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
在实施中，第四MBMS会话转换消息可以为新的信令，也可以采用对现有信令进行扩展。
作为一种优选的实现方式，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS Session Update消息，即MCE采用对现有的MBMS Session Update消息进行扩展，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
作为另一种优选的实现方式，第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求(MBMS Counting Request)消息，即MCE采用对现有的MBMS Counting Request消息进行扩展，以通知基站该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
参见图14所示，基站14包括收发信机141、以及与该收发信机141连接的至少一个处理器142，其中：
一、若BM-SC在接收到该第二通知消息后，通过用户面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，则：
收发信机141被配置具体用于：接收BM-SC发送的携带有SYNC信息的数据；
处理器142被配置具体用于：根据携带有SYNC信息的数据，判断出GCSE-AS将进行组通信业务从多播传输到单播传输的转换，并触发收发信机141通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
具体的，收发信机141可以采用上述方式1～方式4中的任一方式通知该基站所服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体参见方法部分的描述。
二、若BM-SC在接收到该第二通知消息后，通过控制面机制通知E-UTRAN侧设备该GCSE-AS将进行组通信业务从多播传输到单播传输的转换，则：
收发信机141被配置具体用于：接收MCE发送的第四MBMS会话转换消息；
处理器142被配置具体用于：根据该第四MBMS会话转换消息，判断出GCSE-AS将进行组通信业务从多播传输到单播传输的转换，并触发收发信机141通知该基站所服务的终端该GCSE-AS将进行组通信业务从多播传输到单播传输的转换。
具体的，收发信机141可以采用上述方式1～方式4中的任一方式通知该基站所服务的终端GCSE-AS将进行组通信业务从多播传输到单播传输的转换，具体参见方法部分的描述。
参见图15所示，终端15包括收发信机151、以及与该收发信机151连接的至少一个处理器152，其中：
收发信机151被配置用于：接收GCSE-AS将进行组通信业务从多播传输到单播传输的转换的通知；
处理器152被配置用于：触发用于单播传输的单播承载的建立过程，并触发收发信机151向GCSE-AS发送第一通知消息，以及停止采用多播方式接收GCSE-AS发送的组通信业务，该第一通知消息用于通知GCSE-AS对组通信业务进行单播传输。
具体的，收发信机151被配置具体用于：
接收该终端所属的基站发送的MSI，其中，该MSI中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式1的描述)；或者，
在MCCH上接收该终端所属的基站发送的RRC消息，其中，该RRC消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式2的描述)；或者，
在MCCH上接收该终端所属的基站发送的MBMS计数请求消息，其中，该MBMS计数请求消息中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式3的描述)；或者，
在MCCH上接收该终端所属的基站发送的SIB，其中，该SIB中携带用于指示GCSE-AS将进行组通信业务从多播传输到单播传输的转换的指示信息(具体参见上述方式4的描述)。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (25)

  1. 一种保持组通信业务连续性的方法，其特征在于，该方法包括：
    组通信业务应用服务器GCSE-AS在确定需要将组通信业务从多播传输切换到单播传输时，通知所述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述GCSE-AS在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务。
  2. 如权利要求1所述的方法，其特征在于，所述GCSE-AS通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，包括：
    所述GCSE-AS通过GC2接口，向广播-多播服务中心BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  3. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    所述BM-SC在接收到所述第二通知消息后，向基站发送携带有同步SYNC信息的数据，所述SYNC信息中携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述BM-SC在接收到所述第二通知消息后，向多媒体广播多播业务MBMS网关发送第一MBMS会话转换消息，以通知所述MBMS网关所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  4. 如权利要求3所述的方法，其特征在于，所述第一MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
  5. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    所述MBMS网关在接收到所述第一MBMS会话转换消息后，向MME发送第二MBMS会话转换消息，以通知所述MME所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  6. 如权利要求5所述的方法，其特征在于，所述第二MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
  7. 如权利要求5所述的方法，其特征在于，所述方法还包括：
    所述MME在接收到所述第二MBMS会话转换消息后，向多小区/多播协调实体MCE 发送第三MBMS会话转换消息，以通知所述MCE所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  8. 如权利要求7所述的方法，其特征在于，所述第三MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息。
  9. 如权利要求7所述的方法，其特征在于，所述方法还包括：
    所述MCE在接收到所述第三MBMS会话转换消息后，向基站发送第四MBMS会话转换消息，以通知所述基站所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  10. 如权利要求9所述的方法，其特征在于，所述第四MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；或者，
    所述第四MBMS会话转换消息为携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求消息。
  11. 如权利要求3或9所述的方法，其特征在于，所述方法还包括：
    所述基站在接收到携带有所述SYNC信息的数据或所述第四MBMS会话转换消息之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  12. 如权利要求11所述的方法，其特征在于，所述基站通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，包括：
    所述基站通过多播信道调度信息MSI，通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述基站在MCCH上通过无线资源控制RRC消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述基站在MCCH上通过MBMS计数请求消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述基站通过广播系统消息块SIB，通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，所述SIB中携带用于指示所述GCSE-AS将进行 所述组通信业务从多播传输到单播传输的转换的指示信息。
  13. 如权利要求10所述的方法，其特征在于，所述SIB为SIB13或SIB15。
  14. 一种保持组通信业务连续性的方法，其特征在于，该方法包括：
    终端接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；
    所述终端向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述GCSE-AS对所述组通信业务进行单播传输。
  15. 如权利要求14所述的方法，其特征在于，终端接收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知，包括：
    所终端接收所述终端所属的基站发送的MSI，其中，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述终端在MCCH上接收所述终端所属的基站发送的RRC消息，其中，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述终端在MCCH上接收所述终端所属的基站发送的MBMS计数请求消息，其中，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    所述终端在MCCH上接收所述终端所属的基站发送的SIB，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
  16. 如权利要求15所述的方法，其特征在于，所述SIB为SIB13或SIB15。
  17. 一种组通信业务应用服务器GCSE-AS，其特征在于，该GCSE-AS包括：
    第一处理模块，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知所述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    第二处理模块，用于在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务。
  18. 如权利要求17所述的GCSE-AS，其特征在于，所述第一处理模块具体用于：
    通过GC2接口，向广播多播服务中心BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  19. 一种终端，其特征在于，该终端包括：
    第一控制模块，用于收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的 转换的通知后，触发用于单播传输的单播承载的建立过程；
    第二控制模块，用于向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述GCSE-AS对所述组通信业务进行单播传输。
  20. 如权利要求19所述的终端，其特征在于，所述第一控制模块具体用于：
    接收所述终端所属的基站发送的MSI，其中，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    在MCCH上接收所述终端所属的基站发送的RRC消息，其中，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    在MCCH上接收所述终端所属的基站发送的MBMS计数请求消息，其中，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    在MCCH上接收所述终端所属的基站发送的SIB，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
  21. 一种通信系统，其特征在于，该系统包括：
    GCSE-AS，用于在确定需要将组通信业务从多播传输切换到单播传输时，通知所述GCSE-AS所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；以及，在接收到所述终端发送的第一通知消息后，在所述终端已建立的用于单播传输的单播承载上传输所述组通信业务，且停止采用多播方式发送所述组通信业务；
    终端，用于收到GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的通知后，触发用于单播传输的单播承载的建立过程；以及，向所述GCSE-AS发送第一通知消息，并停止采用多播方式接收所述组通信业务，所述第一通知消息用于通知所述GCSE-AS对所述组通信业务进行单播传输。
  22. 如权利要求21所述的系统，其特征在于，该系统还包括：BM-SC和基站，其中：
    所述GCSE-AS还用于：通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述BM-SC具体用于：在接收到所述第二通知消息后，向基站发送携带有SYNC信息的数据，所述SYNC信息中携带有用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；
    所述基站具体用于：在接收到携带有所述SYNC信息的数据之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  23. 如权利要求21所述的系统，其特征在于，该系统还包括：BM-SC、MBMS网关、MME、MCE和基站，其中：
    所述GCSE-AS还用于：通过GC2接口，向BM-SC发送第二通知消息，其中，所述第二通知消息用于通知所述BM-SC所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述BM-SC具体用于：在接收到所述第二通知消息后，向所述MBMS网关发送第一MBMS会话转换消息，以通知所述MBMS网关所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述MBMS网关具体用于：在接收到所述第一MBMS会话转换消息后，向所述MME发送第二MBMS会话转换消息，以通知所述MME所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述MME具体用于：在接收到所述第二MBMS会话转换消息后，向所述MCE发送第三MBMS会话转换消息，以通知所述MCE所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述MCE具体用于：在接收到所述第三MBMS会话转换消息后，向所述基站发送第四MBMS会话转换消息，以通知所述基站所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换；
    所述基站具体用于：在接收到所述第四MBMS会话转换消息之后，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换。
  24. 如权利要求23所述的系统，其特征在于，
    所述第一MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
    所述第二MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
    所述第三MBMS会话转换消息为携带有用于所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；
    所述第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS会话更新消息；或者，所述第四MBMS会话转换消息为携带有用于指示GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息的MBMS计数请求消息。
  25. 如权利要求22～24任一项所述的系统，其特征在于，所述基站具体用于：
    通过MSI通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MSI中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单 播传输的转换的指示信息；或者，
    在MCCH上通过RRC消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述RRC消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    在MCCH上通过MBMS计数请求消息，通知所述基站所服务的终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，所述MBMS计数请求消息中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息；或者，
    通过SIB通知所述终端所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换，其中，所述SIB中携带用于指示所述GCSE-AS将进行所述组通信业务从多播传输到单播传输的转换的指示信息。
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