WO2014044211A1 - 一种移动通信网络中直连通讯终端会话切换方法及装置 - Google Patents

一种移动通信网络中直连通讯终端会话切换方法及装置 Download PDF

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Publication number
WO2014044211A1
WO2014044211A1 PCT/CN2013/083924 CN2013083924W WO2014044211A1 WO 2014044211 A1 WO2014044211 A1 WO 2014044211A1 CN 2013083924 W CN2013083924 W CN 2013083924W WO 2014044211 A1 WO2014044211 A1 WO 2014044211A1
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WIPO (PCT)
Prior art keywords
terminal
session
bearer
session switching
peer
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PCT/CN2013/083924
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English (en)
French (fr)
Inventor
谢宝国
李志军
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中兴通讯股份有限公司
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Publication of WO2014044211A1 publication Critical patent/WO2014044211A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for switching a direct communication terminal in a mobile communication network. Background technique
  • UE User Equipment
  • AS Application Server
  • a Packet Service (PS) network and an Evolved Packet System (EPS) provide IP-based data communication.
  • PS Packet Service
  • EPS Evolved Packet System
  • the IP address of the UE is the responsibility of the IP assignment entity in the network, and all IP data flows need to go through the IP assignment entity.
  • FIG. 1 is a schematic structural diagram of a UE accessing a 3GPP (3rd Generation Partnership Project) wireless network packet domain according to the related art.
  • the architecture involves: UE, UMTS Terrestrial Radio Access Network (UTRAN), Evolved UMTS (E-UTRAN for short), and service GPRS.
  • the PGW and the GGSN are respectively IP assignment entities in the E-UTRAN and UTRAN/GERAN, and the GGSN and the PGW may be collectively referred to as a public data network gateway.
  • the UE can access the core network through UMTS and E-UTRAN, and after the IP address is assigned, the IP data communication with the application server AS and other terminals can be realized.
  • IP data After passing through the base station, the flow is forwarded to the public data network gateway (GGSN/PGW), which is then sent by the GGSN/PGW to the AS and the destination UE according to the IP routing rules.
  • the communication between the UE to the base station and the base station to the public data network gateway (GGSN/PGW) is not based on IP routing rules, but is based on a dedicated data tunnel routing technology.
  • the base station does not perceive the information of the IP layer. For example, the base station does not know the IP address, port, and the like of the UE.
  • the existing solution can use the base station to perform the offloading manner, and the IP data of the UE accessing the IT website can be directly accessed by the base station to the external data gateway.
  • LTE Direct communication LTE radio frequency band
  • D2D Direct to Direct communication
  • the D2D terminal performs enhanced mobility management, D2D authentication, network resource allocation, etc., and needs to newly define an access control method and system for the neighboring terminal, so as to ensure that the adjacent terminal realizes the direct data link under the network control.
  • Road IP communication To the network, the D2D terminal performs enhanced mobility management, D2D authentication, network resource allocation, etc., and needs to newly define an access control method and system for the neighboring terminal, so as to ensure that the adjacent terminal realizes the direct data link under the network control. Road IP communication.
  • FIG. 2 is one of the scenarios of D2D communication, that is, a scheme for seeking to establish a direct communication link between UE1 and UE2, which is a D2D terminal directly communicating.
  • the communication uses the burst technology of power-up and similar WIFI broadcast mechanism to realize mutual discovery, and then establishes direct data communication between D2D terminals under network control, and the IP data packet is sent and received without passing through the base station and the core network.
  • the D2D session has a regional location range limitation, so there is a need to switch between the D2D bearer and the EPS bearer when in the critical region.
  • the source UE1 and the opposite UE2 are in the same eNB for the session, and the session is switched when the source UE1 moves to another eNB. See Figure 3, the session at this time.
  • the switching process is as follows:
  • Step 101 The source UE1 and the peer UE2 implement a session through the EPS bearer in the EPS network, and both the source end and the peer end access the network in the first eNB.
  • Step 102 When the source end moves from the first eNB to the second eNB, the first eNB detects that the source end has moved to the second eNB by using the measurement report of the source UE1, and the first eNB sends the information from the X2 interface to the second eNB. Session switch request.
  • the second eNB After receiving the session handover request, the second eNB establishes a wireless data bearer with the source UE1, and sends the session request to the MME.
  • Step 103 If the X2 interface switching in step 102 is not used, and the S1 interface is switched, the first eNB needs to send the session switching request to the MME through the S1 interface.
  • the MME performs session switching through the second eNB, and the second eNB establishes a radio data bearer with the source UE1.
  • Steps 104-105 The MME performs bearer modification by using the SGW/PGW.
  • the SGW acquires the IP address and the tunnel identifier of the second eNB in the bearer modification message, and establishes a tunnel data channel with the second eNB.
  • Step 106 The session between the source end and the peer end is successfully switched.
  • the source end UE1 can send the IP packet data to the peer UE2 of the first eNB through the second eNB, and the source end and the peer end perform a session on the EPS link.
  • D2D bearers When a D2D session occurs, if the source or peer moves and leaves the D2D area, the D2D session may be disconnected or the session may be poor due to poor wireless signals. There is a need for D2D bearers to switch to EPS bearers; vice versa.
  • D2D bearer and EPS inheritance The switching between the two is very different from the existing session switching technology.
  • the energy end and the opposite end are still located in the same eNB. Therefore, the eNB cannot switch according to the strength of the signal in the measurement report.
  • the network side needs to know the information of the source end and the peer end, and establish a D2D bearer or EPS bearer for the terminal again to complete the session switch.
  • the technical problem to be solved by the present invention is to provide a method and a device for switching a direct communication terminal in a mobile communication network, thereby implementing seamless switching between a D2D bearer and an EPS bearer in an EPS network, so that the user is not caused by the terminal moving.
  • the impact of disconnection or poor voice improves the user experience.
  • the present invention provides a session switching method for a direct communication terminal in a mobile communication network.
  • the network side initiates a handover of the D2D bearer and the evolved packet system (EPS) bearer according to the D2D session switching request decision.
  • D2D first continuous communication
  • EPS evolved packet system
  • the range of the D2D area changes, including:
  • the first D2D terminal and the second D2D terminal enter or leave the D2D area.
  • the network side decides to initiate the switching of the EPS bearer to the D2D bearer
  • the network side decision initiates a handover of the D2D bearer to the EPS bearer.
  • the first D2D terminal or the second D2D terminal initiates the D2D session switching request to the network side when it is determined that the D2D area range changes by checking the strength of the other party's wireless signal;
  • the base station or the mobility management entity (MME) on the network side judges according to the location information in the measurement report, or the D2D discovery mechanism on the radio access side, or the D2D discovery mechanism on the core network side. And when the D2D session switching request is changed, the D2D session switching request is initiated, where the D2D session switching request includes the terminal identifier of the first D2D terminal and the second D2D terminal, and a D2D session switching indication.
  • MME mobility management entity
  • the method further includes:
  • the network side performs a D2D communication check on the first D2D terminal and the second D2D terminal according to the D2D session switching request, and then initiates a switch between the D2D bearer and the EPS bearer.
  • the D2D communication check includes one or any combination of the following: a D2D area location of the first D2D terminal and the second D2D terminal, a D2D capability; a D2D capability on the network side; the first D2D Whether the terminal and the second D2D terminal subscribe to the D2D service.
  • the method further includes:
  • the first D2D terminal and the second D2D terminal are allocated D2D 7 resources or EPS 7 resources.
  • the method further includes:
  • the network side When the first D2D terminal or the second D2D terminal is in an idle state, the network side performs paging according to the terminal identifier, so that the first D2D terminal or the second D2D terminal resumes the connected state.
  • the present invention also provides a direct communication terminal session switching device in a mobile communication network, which is applied to a D2D terminal, and the device includes:
  • the D2D area range detecting module is configured to: detect whether the D2D area of the D2D terminal and the D2D peer end of the current session change;
  • the session switching initiation module is configured to: initiate a D2D session switching request to the network side when the D2D area range changes;
  • the session switching execution module is configured to: receive a session switching command from the network side, and perform a corresponding session switching operation according to the session switching command.
  • the session switching initiation module is configured to: carry the D2D terminal and the D2D peer terminal identifier, and the D2D session switching request indication in the initiated D2D session switching request.
  • the D2D area range detecting module is configured to: determine whether the D2D area range changes by checking the strength of the other party's wireless signal;
  • the range of the D2D area changes, including: entering or leaving the D2D area with the opposite end of the D2D.
  • the device further includes:
  • the communication link establishing module is configured to: establish a D2D bearer with the D2D peer end, or establish an EPS bearer with the network side.
  • the present invention also provides a direct communication terminal session switching device in a mobile communication network, which is applied to the network side, and the device includes:
  • the session switching processing module is configured to: initiate a switch between the D2D bearer and the EPS bearer when the D2D terminal of the D2D terminal and the D2D peer range of the D2D peer change are changed, or according to the D2D session switch request.
  • the session switching processing module is configured to: determine whether the range of the D2D area of the D2D terminal and the D2D peer changes by:
  • the location information in the measurement report or the D2D discovery mechanism on the radio access side, or the D2D discovery mechanism on the core network side.
  • the session switching processing module is configured to: after the decision to initiate the switching of the D2D bearer and the EPS bearer, carry the terminal identifier of the D2D terminal and the D2D peer, and the D2D session switching indication in the session switching message, and The D2D terminal sends a session switching command with the D2D peer.
  • the device further includes:
  • the communication service resource allocation module is configured to allocate D2D communication service resources, including D2D bearer resources or EPS bearer resources, to the D2D terminal and the D2D peer.
  • the device further includes:
  • the D2D communication service check module is configured to: check whether the requested D2D session switch meets one of the following conditions or any combination thereof: a D2D area position of the D2D terminal and the D2D peer end, a D2D capability; a D2D capability of the network side; Whether the D2D terminal and the D2D peer sign the D2D service.
  • the device further includes:
  • a paging module configured to: when the D2D terminal and the D2D peer are in an idle state, paging the D2D terminal and the D2D peer according to the D2D terminal and the D2D peer terminal identifier in the session switching request Let it return to the connected state.
  • FIG. 1 is a schematic diagram of an architecture of a UE accessing a packet domain according to the related art
  • FIG. 2 is a schematic diagram of a D2D terminal implementing D2D direct communication in a packet domain domain architecture
  • FIG. 3 is a schematic diagram of a process in which a terminal performs session switching in an EPS network in the prior art
  • FIG. 4 is a D2D terminal in the first embodiment of the present invention
  • FIG. 5 is a schematic flowchart of implementing D2D session switching between a D2D terminal and a peer end in the same eNB according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic flowchart of implementing D2D session switching between a D2D terminal and a peer end in the same eNB according to Embodiment 3 of the present invention
  • FIG. 7 is a schematic flowchart of D2D session switching between a D2D terminal and a peer end in a neighboring eNB according to Embodiment 4 of the present invention.
  • FIG. 8 is a schematic flowchart of D2D session switching between a D2D terminal and a peer end in a neighboring eNB according to Embodiment 5 of the present invention
  • FIG. 9 is a schematic block diagram of a D2D terminal session switching apparatus in a network side and a D2D terminal side mobile communication network according to an embodiment of the present invention. Preferred embodiment of the invention
  • the embodiment provides a method for D2D terminal session switching in a mobile communication network, and the purpose is to use a D2D bearer or an EPS bearer to perform a session in a D2D source end and a D2D peer end, and when the terminal moves, leave or enter D2D.
  • the 3GPP network needs to provide a seamless session switching service, so that the user's session quality is not affected by the terminal mobility.
  • the method for switching a D2D terminal session in a mobile communication network adopts the following scheme:
  • the network side initiates a switch between the D2D bearer and the EPS bearer according to the D2D session switch request decision.
  • the range of the D2D area changes, including:
  • the first D2D terminal and the second D2D terminal enter or leave the D2D area.
  • the network side decides to initiate the switching of the EPS bearer to the D2D bearer
  • the network side decision initiates a handover of the D2D bearer to the EPS bearer.
  • the first/second D2D terminal may determine whether the D2D area range changes according to its own capability.
  • the D2D session switching request is initiated, and the D2D bearer and the EPS bearer are switched.
  • the D2D session switching request is initiated to the network side eNB/MME;
  • the D2D session switching request includes a terminal identifier of the opposite end and a D2D session switching indication. Further, after the network side performs the D2D communication check according to the D2D session switching indication, The decision initiates a handover of the D2D bearer and the EPS bearer.
  • the D2D communication check includes: checking whether the first/second D2D terminal has a D2D service capability, and whether the first/second D2D terminal enters or leaves the location check of the D2D area range, and the like.
  • the above solution includes the following main contents:
  • the source or peer moves and leaves the D2D area.
  • the terminal has the capability to check whether the D2D area changes, the D2D terminal initiates a D2D session switching request to the network side when the D2D terminal is critical, and requests to switch from the D2D bearer to the EPS bearer to prevent the D2D session from being caused by the excessive distance between the terminals. Interrupted.
  • the D2D session switching request needs to carry the terminal identifier of the other party, and notify the network side which terminal is in the session.
  • the D2D session switching request also needs to carry a D2D session switching indication, indicating that it is a D2D session switching.
  • a D2D session switching indication indicating that it is a D2D session switching.
  • the radio access network eNB has the capability to check whether the D2D area range changes, when the eNB finds the D2D area critical
  • the D2D session switching request may be initiated to the MME, and the source end identifier, the peer end identifier, and the D2D session switching indication are also required to be carried in the D2D session switching request.
  • the MME also decides to initiate a D2D session handover request when the MME finds the D2D area critical, and then notifies the radio access network eNB to perform session switching.
  • the MME receives the session handover request or the decision initiation session request, the MME performs a D2D communication check according to the D2D session handover indication and decides to initiate a session handover from the D2D bearer to the EPS bearer.
  • the D2D communication check includes checking whether the terminal and the network have D2D service capabilities, and whether the terminal enters or leaves the location check of the D2D area.
  • the network side needs to first paging the terminal to connect the terminal to the network and establish an EPS bearer to restore the connection state.
  • the network side performs D2D session switching, allocates resources to the D2D source end and the D2D peer end according to the terminal and the source end identifier in the session switching request, and notifies the D2D source end and the peer end to perform session switching.
  • the source end and the peer end switch the IP session packet from the D2D bearer to the EPS bearer, and optionally release the D2D bearer, and complete the session switching operation of the D2D bearer to the EPS bearer.
  • the D2D source and the peer connected to the same eNB or neighboring eNB are transmitting through the EPS During a D2D session, the source or peer moves and enters the D2D area.
  • session switching is required. If the terminal has the capability to check whether the range of the D2D area changes, the D2D terminal initiates a D2D session switching request to the network side when the D2D terminal is found to be critical, requesting to switch from the EPS bearer to the D2D bearer, so that the terminal uses a higher call quality.
  • the D2D bearer is engaged in a session.
  • the D2D session switching request needs to carry the terminal identifier of the other party, and notify the network side which terminal is in the session.
  • the D2D session switching request also needs to carry a D2D session switching indication, indicating that it is a D2D session switching.
  • the D2D session switching request may be initiated to the MME, and the source end identifier, the peer end identifier, and the D2D session switching indication are also required to be carried in the D2D session switching request.
  • the MME also decides to initiate a D2D session handover request when the MME discovers the D2D area criticality, and then notifies the radio access network eNB to perform session switching.
  • the MME receives the session handover request or the decision initiation session request, the MME performs a D2D communication check according to the D2D session handover indication and decides to initiate a session handover from the D2D bearer to the EPS bearer.
  • the D2D communication check includes checking whether the terminal and the network have D2D service capabilities, and whether the terminal enters or leaves the location check of the D2D area.
  • the network side performs D2D session switching, allocates resources to the D2D source end and the D2D peer end according to the terminal and the source end identifier in the session switching request, and notifies the D2D source end and the peer end to perform session switching.
  • the source end and the peer end switch the IP session packet from the EPS bearer to the D2D bearer, and optionally release the EPS bearer, and complete the session switching operation of the EPS bearer to the D2D bearer.
  • the 3GPP network can perform D2D communication service check on the service request initiated by the D2D terminal, and determine whether to allocate the communication resource of the D2D session to the terminal according to the result of the D2D communication service check, and implement D2D session switching. If the network side decides to perform session switching for the D2D terminal, the communication resource of the D2D session is provided for the session switching, and the terminal completes the switching between the D2D bearer and the EPS bearer according to the communication resources provided by the network side.
  • This embodiment mainly describes that the D2D source and the peer connected to the same eNB are carrying out D2D sessions through the D2D bearer. At this time, the source end moves and leaves the D2D area.
  • the D2D terminal may initiate a D2D session switching request to the network side when checking the D2D area criticality.
  • the eNB may initiate a D2D session handover request to the MME when checking the D2D area criticality; and check whether the D2D area is critical for the MME to check whether the D2D area range satisfies the D2D session scenario. It is possible to decide whether to initiate a D2D session handover, and then notify the radio access network eNB to perform session switching.
  • the MME performs D2D communication check according to the D2D session handover indication and decides to initiate session switching from the D2D bearer to the EPS bearer.
  • the network side notifies the terminal to perform session switching, and the source end and the peer end transmit and receive the IP session packet from the EPS bearer, and release the D2D bearer, and complete the session switching operation of the D2D bearer to the EPS bearer.
  • Step 201 The D2D source end and the D2D peer end access the EPS network through the same eNB, and the network side establishes the EPS bearer and the D2D bearer for the source end and the terminal.
  • the D2D source and terminal use the D2D link for D2D sessions.
  • Step 202 The D2D source moves, and gradually leaves the D2D area. In this case, to prevent the session from being interrupted, a session switch is required.
  • the D2D terminal checks whether the D2D area is satisfied, for example, the strength of the wireless signal of the other party can be checked.
  • the D2D terminal can initiate a session switching request to the network side to request to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 203 After receiving the D2D session switching request initiated by the terminal, the network side eNB sends a session switching request to the MME through the S1 interface with the MME.
  • the network side eNB has the ability to check whether the D2D area range is satisfied according to the related information, for example, according to the location information in the measurement report of the terminal, or according to the D2D discovery mechanism of the wireless access side.
  • the eNB may initiate a session switch request to the MME, please Seek to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 204 After receiving the session switching request, the MME performs D2D communication check on the source end and the terminal according to the D2D session switching request indication in the handover request, checks whether the D2D capability is available, and signs the D2D service. And checking the D2D area range of the source end and the terminal, whether the location of the terminal has met the condition of D2D session switching. If the check satisfies the requirements, the MME performs a D2D session switching operation.
  • Step 205 The MME sends a session handover command to the eNB where the terminal is located, and notifies the eNB to perform session switching.
  • the network side MME has the ability to check whether the D2D area range of the terminal has met the session switching condition based on the related information, for example, the D2D discovery mechanism on the core network side.
  • the MME may decide to initiate a session switching operation.
  • the MME may send a session handover request to the eNB where the terminal is located.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 206 The eNB checks whether the source end has established a wireless data bearer. If the wireless data bearer is established, the eNB sends a session switch command to the source end to notify the source end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the peer identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 207 The source end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the peer end can also receive the IP data packet of the source end through the EPS bearer.
  • Steps 208 ⁇ 209 The source end returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the eNB may carry the source identifier, the IP address of the eNB allocated to the source, and the tunnel ID information.
  • Step 210 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW to restore the downlink bearer link of the source EPS bearer.
  • Step 211 After the EPS bearer uplink and downlink recovery, the IP data packet of the source end can pass the EPS. Bearer transceiver, not required to pass D2D bearer.
  • Step 212 The MME sends a session handover command or request to the eNB where the peer end is located, and notifies the eNB to perform session switching.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 213 The eNB checks whether the wireless data bearer is established on the peer end. If the wireless data bearer is established, the eNB sends a session switch command to the peer end to notify the peer end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the source end identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 214 The peer end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the source end can also receive the IP data packet of the peer end through the EPS bearer.
  • Steps 215 ⁇ 216 The peer returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the eNB may carry the peer identifier, the IP address of the eNB allocated to the peer, and the tunnel ID information.
  • Step 217 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW to restore the downlink bearer link of the peer EPS bearer.
  • Step 218 After the EPS bearer uplink and downlink link is restored, the IP data packet of the source end can be sent and received through the EPS bearer, and is not required to be carried by the D2D bearer.
  • Step 219 After the D2D bearer is switched to the EPS bearer, optionally, the source end and the peer end request the eNB to release the D2D radio resource, and after the eNB decides, notify the source end and the peer end to release the D2D radio resource.
  • This embodiment mainly describes that the D2D source and the peer end accessed by the same eNB are performing D2D sessions through the D2D bearer. At this time, the source end moves and leaves the D2D area.
  • the D2D terminal may initiate a D2D session switching request to the network side when checking the D2D area criticality.
  • the eNB may initiate D2D to the MME when checking the D2D area criticality.
  • the MME checks whether the D2D area is critical, the MME can decide whether to initiate a D2D session handover, and then notify the radio access network eNB to perform session switching.
  • the MME performs a D2D communication check according to the D2D session handover indication and decides to initiate a session handover from the D2D bearer to the EPS bearer. If the terminal and the peer are in the idle state, the EPS bearer connection is interrupted, and the network first pages the terminal, so that the terminal accesses the network to establish an EPS bearer.
  • the network side notifies the terminal to perform the session switching, and the source and the peer end transmit and receive the IP session packet from the EPS bearer, and release the D2D bearer, and complete the session switching operation of the D2D bearer to the EPS bearer.
  • Step 301 The D2D source end and the D2D peer end are connected to the EPS network through the same eNB, and the D2D bearer is established on the network side for the source end and the terminal end, and the source end and the opposite end are in the IDLE state, and the EPS bearer is released.
  • the D2D source and terminal use the D2D link for D2D sessions.
  • Step 302 The D2D source moves, and gradually leaves the D2D area. In this case, to prevent the session from being interrupted, a session switch is required.
  • the D2D terminal checks whether the D2D area is satisfied, for example, the strength of the wireless signal of the other party can be checked.
  • the D2D terminal can initiate a session switching request to the network side to request to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 303 After receiving the D2D session switching request initiated by the terminal, the network side eNB sends a session switching request to the MME through the S1 interface with the MME.
  • the network side eNB has the ability to check whether the D2D area range is satisfied according to the related information, for example, according to the location information in the measurement report of the terminal, or according to the D2D discovery mechanism of the wireless access side.
  • the eNB may initiate a session handover request to the MME requesting handover to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 304 After receiving the session switching request, the MME performs D2D communication check on the source end and the terminal according to the D2D session switching request indication in the handover request, checks whether the D2D capability is available, and signs the D2D service. And checking the D2D area range of the source end and the terminal, whether the location of the terminal has met the condition of D2D session switching. If the check meets the requirements, the MME proceeds D2D session switching operation.
  • Step 305 The MME sends a session handover command to the eNB where the terminal is located, and notifies the eNB to perform session switching.
  • the network side MME has the ability to check whether the D2D area range of the terminal has met the session switching condition based on the related information, for example, the D2D discovery mechanism on the core network side.
  • the MME may decide to initiate a session switching operation.
  • the MME may send a session handover request to the eNB where the terminal is located.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 306 If the source end is in the idle state, the EPS bearer is not established, and the network side pages the source end, activates the terminal to access the network, and establishes an EPS bearer.
  • Step 307 After receiving the paging, the source sends an access request to the eNB, requesting re-access to the network, and the eNB sends an access request to the MME, and the MME notifies the eNB to establish a wireless data bearer for the source.
  • the MME sends a bearer setup request to the SGW/PGW, establishes an EPC bearer on the core network side, and finally establishes an EPS bearer.
  • Step 308 The eNB checks whether the source end has established a wireless data bearer. If the wireless data bearer is established, the eNB sends a session switch command to the source end to notify the source end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the peer identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 309 The source end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the peer end can also receive the IP data packet of the source end through the EPS bearer.
  • Steps 310 to 311 The source end returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the eNB may carry the source identifier, the IP address of the eNB allocated to the source, and the tunnel ID information.
  • Step 312 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW to modify the downlink bearer link of the source EPS bearer.
  • Step 313 After the EPS bears the uplink and downlink links, the IP data packet of the source end can pass the EPS. Bearer transceiver, not required to pass D2D bearer.
  • Step 314 The MME sends a session handover command or request to the eNB where the peer end is located, and notifies the eNB to perform session switching.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 315 If the peer is in the idle state, the EPS bearer is not established, and the network side pages the peer end, activates the terminal to access the network, and establishes an EPS bearer.
  • Step 316 After receiving the paging, the peer sends an access request to the eNB, requesting to re-access the network, and the eNB sends an access request to the MME, and the MME notifies the eNB to establish a wireless data bearer for the peer.
  • the MME sends a bearer setup request to the SGW/PGW, establishes an EPC bearer on the core network side, and finally establishes an EPS bearer.
  • Step 317 The eNB checks whether the wireless data bearer is established on the peer end. If the wireless data bearer is established, the eNB sends a session switch command to the peer end to notify the peer end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the source end identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 318 The peer end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the source end can also receive the IP data packet of the peer end through the EPS bearer.
  • Steps 319-320 The peer returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the eNB may carry the peer identifier, the IP address of the eNB allocated to the peer, and the tunnel ID information.
  • Step 321 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW to modify the downlink bearer link of the peer EPS bearer.
  • Step 322 After the IP bearer uplink and downlink is normal, the IP data packet of the source end can be sent and received through the EPS bearer, and is not required to be carried by the D2D.
  • Step 323 After the D2D bearer is switched to the EPS bearer, optionally, the source end and the peer end request the eNB to release the D2D radio resource, and after the eNB decides, notify the source end and the peer end to release the D2D radio resource.
  • Embodiment 3 After the D2D bearer is switched to the EPS bearer, optionally, the source end and the peer end request the eNB to release the D2D radio resource, and after the eNB decides, notify the source end and the peer end to release the D2D radio resource.
  • This embodiment mainly describes that the D2D source and the peer end accessed by the same eNB are performing D2D sessions through the EPS bearer. At this time, the source end moves and enters the D2D area.
  • the D2D terminal may initiate a D2D session switching request to the network side when checking the D2D area criticality.
  • the eNB may initiate a D2D session handover request to the MME when checking the D2D area criticality; and check whether the D2D area is critical for the MME to check whether the D2D area range satisfies the D2D session scenario. It is possible to decide whether to initiate a D2D session handover, and then notify the radio access network eNB to perform session switching.
  • the MME performs D2D communication check according to the D2D session handover indication and decides to initiate a session handover from the EPS bearer to the D2D bearer.
  • the network side notifies the terminal to perform session switching.
  • the source and the peer end transmit and receive the IP session packet from the D2D bearer, and optionally release the EPS bearer, and complete the session switching operation of the EPS bearer to the D2D bearer.
  • Step 401 The D2D source end and the D2D peer end are connected to the EPS network through the same eNB, and the network side establishes an EPS bearer for the source end and the terminal.
  • the D2D source and terminal use the EPS bearer link for D2D sessions.
  • Step 402 The D2D source moves, and gradually enters the D2D area. At this time, if both the terminal and the network support the D2D service and the D2D capability, session switching is required for the high-QoS and low-cost communication services of the core network data to be effectively split and the terminal communication.
  • the D2D terminal checks whether the D2D area is satisfied, for example, the strength of the wireless signal of the other party can be checked.
  • the D2D terminal can initiate a session switching request to the network side to request to switch to the D2D bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 403 After receiving the D2D session switching request initiated by the terminal, the network side eNB sends a session switching request to the MME through the S1 interface with the MME.
  • the network side eNB has the ability to check whether the D2D area range is satisfied according to the related information, for example, according to the location information in the measurement report of the terminal, or according to the D2D discovery mechanism of the wireless access side.
  • the eNB may initiate a session switch request to the MME, please Seek to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 404 After receiving the session switching request, the MME performs D2D communication check on the source end and the terminal according to the D2D session switching request indication in the handover request, checks whether the D2D capability is available, and signs the D2D service. And checking the D2D area range of the source end and the terminal, whether the location of the terminal has met the condition of D2D session switching. If the check satisfies the requirements, the MME performs a D2D session switching operation.
  • Step 405 The MME sends a session handover command to the eNB where the terminal is located, and notifies the eNB to perform session switching.
  • the network side MME has the ability to check whether the D2D area range of the terminal has met the session switching condition based on the related information, for example, the D2D discovery mechanism on the core network side.
  • the MME may decide to initiate a session switching operation.
  • the MME may send a session handover request to the eNB where the terminal is located.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 406 The eNB allocates D2D radio resources to the source and the peer, including LTE spectrum resources, time slot parameters, and QoS parameters.
  • Step 407 After the eNB allocates the D2D radio resource to the terminal, the eNB sends a session switch command message to the source end, where the message includes the D2D radio resource parameter, the peer end identifier, and the EPS bearer to the D2D bearer switch indication.
  • Step 408 The eNB sends a session switch command message to the peer end, where the message includes information such as a D2D radio resource parameter, a source end identifier, and an EPS bearer handover indication to the D2D bearer.
  • the message includes information such as a D2D radio resource parameter, a source end identifier, and an EPS bearer handover indication to the D2D bearer.
  • Step 409 After receiving the D2D session switching command, the source end and the peer end establish a direct D2D bearer according to the identity of the other party, and send and receive IP data packets through the D2D bearer, and switch the session on the EPS bearer to the D2D bearer.
  • Steps 410 to 411 The source end returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • Step 412 After receiving the session handover confirmation response, the MME may, optionally, provide the SGW/PGW The bearer deactivation request is initiated, and the EPC bearer is released. Optionally, the S1 release interface is sent to the eNB, and the radio bearer is requested to be released.
  • Steps 413 to 414 The peer returns a session handover confirmation response to the eNB, and the eNB returns a session handover confirmation response to the MME.
  • Step 415 After receiving the session handover confirmation response, the MME may initiate a bearer deactivation request to the SGW/PGW to release the EPC bearer. Optionally, the MME sends an S1 release interface to release the radio bearer.
  • Step 416 After the session of the EPS bearer is successfully switched to the D2D bearer, the eNB deletes the RRC connection with the source end and the peer end to release the radio bearer resource.
  • This embodiment mainly describes that the D2D source and the peer connected to the neighboring eNB are performing D2D sessions through the D2D bearer. At this time, the source end moves and leaves the D2D area.
  • the D2D terminal may initiate a D2D session switching request to the network side when checking the D2D area criticality.
  • the eNB may initiate a D2D session handover request to the MME when checking the D2D area criticality; and check whether the D2D area is critical for the MME to check whether the D2D area range satisfies the D2D session scenario. It is possible to decide whether to initiate a D2D session handover, and then notify the radio access network eNB to perform session switching.
  • the MME performs D2D communication check according to the D2D session handover indication and decides to initiate session switching from the D2D bearer to the EPS bearer.
  • the EPS bearer connection is interrupted, and the network first pages the terminal, so that the terminal accesses the network to establish an EPS bearer.
  • the network side notifies the terminal to perform the session switching.
  • the source and the peer end transmit and receive the IP session packet from the EPS bearer, and release the D2D bearer to complete the session switching operation of the D2D bearer to the EPS bearer.
  • Step 501 Both the D2D source end and the D2D peer end access the EPS network through the neighboring eNB, the D2D source end accesses from the first eNB, the D2D peer end accesses from the second eNB, and the D2D source end and the opposite end are in the D2D area. range.
  • the network side establishes a D2D bearer for the source end and the terminal, and the source end and the opposite end can be in the IDLE state, and the EPS bearer is released.
  • D2D source and terminal use D2D link for D2D Conversation.
  • Step 502 The D2D source moves, and gradually leaves the D2D area. In this case, to prevent the session from being interrupted, a session switch is required.
  • the D2D terminal checks whether the D2D area is satisfied, for example, the strength of the wireless signal of the other party can be checked.
  • the D2D terminal can initiate a session switching request to the network side to request to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 503 The network side first eNB (or the second eNB, the document mainly describes the source end and the first eNB, and the process of initiating the session between the peer end and the second eNB is similar, and the description is not repeated) receiving the D2D session initiated by the terminal
  • the session handover request may be sent to the second eNB or the MME through the X2 interface with the second eNB or the S1 interface of the MME, requesting to switch to the EPS bearer.
  • the first eNB on the network side has the ability to check whether the D2D area range is satisfied according to the related information, for example, according to the location information in the measurement report of the terminal, or according to the D2D discovery mechanism of the wireless access side.
  • the first eNB may send a session switching request by using the X2 interface with the second eNB, where the session switching request carries information such as the source identifier, the peer identifier, and the D2D session switching indication, and requests the handover.
  • the EPS bearer may be used to send a session switching request by using the X2 interface with the second eNB, where the session switching request carries information such as the source identifier, the peer identifier, and the D2D session switching indication, and requests the handover.
  • Step 504 After receiving the session switching request of the first eNB, the second eNB sends the session switching request to the MME through the S1 interface.
  • Step 505 If there is no X2 interface between the eNBs, the first eNB may directly send a session handover request to the MME through the S1 interface, requesting to switch to the EPS bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 506 After receiving the session switching request, the MME performs D2D communication check on the source end and the terminal according to the D2D session switching request indication in the handover request, checks whether the D2D capability is available, and signs the D2D service. And checking the D2D area range of the source end and the terminal, whether the location of the terminal has met the condition of D2D session switching. If the check satisfies the requirements, the MME performs a D2D session switching operation.
  • Step 507 The MME sends a session handover command to the first eNB where the source end is located, and notifies the first eNB to perform session switching. If the terminal or the eNB does not send a session handover request to the MME, the network side MME has the capability to check whether the D2D area range of the terminal has met the session handover condition according to the related information, for example, the D2D discovery mechanism on the core network side. When the MME finds that the D2D area range is critical, the MME may decide to initiate a session switching operation. The MME may send a session handover request to the eNB where the terminal is located at this time.
  • the related information for example, the D2D discovery mechanism on the core network side.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 508 If the source end is in the idle state, the EPS bearer is not established, and the network side pages the source end, activates the terminal to access the network, and establishes an EPS bearer.
  • the source After receiving the paging, the source sends an access request to the first eNB to request re-access to the network.
  • the eNB sends an access request to the MME, and the MME notifies the eNB to establish a wireless data bearer for the source.
  • the MME sends a bearer setup request to the SGW/PGW, establishes an EPC bearer on the core network side, and finally establishes an EPS bearer.
  • the first eNB checks whether the source end has established a radio data bearer. If the radio data bearer is established, the first eNB sends a session switch command to the source end to notify the source end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the peer identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 509 The source end returns a session handover confirmation response to the first eNB, and the first eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the first eNB may carry the source identifier, the IP address of the eNB allocated to the source, and the tunnel ID information.
  • Step 510 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW, and modify the downlink bearer link of the source EPS bearer to ensure that the downlink data can originate through the EPS bearer.
  • Step 511 The source end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the peer end can also receive the IP data packet of the source end through the EPS bearer.
  • the IP packets of the source end can be sent and received through the EPS bearer, and are not required to be carried by the D2D.
  • Step 512 The MME sends a session switching command or request to the second eNB where the peer end is located. It is known that the second eNB performs session switching.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 513 If the peer is in the idle state, the EPS bearer is not established, and the network side pages the peer end, activates the terminal to access the network, and establishes an EPS bearer.
  • Step 514 After receiving the paging, the peer sends an access request to the second eNB, requesting to re-access the network, and the second eNB sends an access request to the MME, and the MME notifies the eNB to establish a wireless data bearer for the peer.
  • the MME sends a bearer setup request to the SGW/PGW, establishes an EPC bearer on the core network side, and finally establishes an EPS bearer.
  • the second eNB checks whether the wireless data bearer is established on the peer end. If the wireless data bearer is established, the second eNB sends a session switch command to the peer end to notify the peer end of the session switchover, and switches from the D2D bearer to the EPS bearer.
  • the session switching command carries information such as the source end identifier and the indication that the D2D bearer switches to the EPS bearer.
  • Step 515 The peer returns a session handover confirmation response to the second eNB, and the second eNB returns a session handover confirmation response to the MME.
  • the acknowledgment response returned by the second eNB may carry the source identifier, the IP address of the second eNB allocated to the source, and the tunnel ID information.
  • Step 516 After receiving the session handover confirmation response, the MME may initiate a bearer modification request to the SGW/PGW, and modify the downlink bearer link of the source EPS bearer to ensure that the downlink data can be initiated by the EPS bearer.
  • Step 517 The peer end transmits the IP data packet through the D2D bearer, and also forwards the IP data packet to the EPS bearer.
  • the D2D bearer is interrupted, and the source end can also receive the IP data packet of the peer end through the EPS bearer.
  • the IP data packets of the peer end can be sent and received through the EPS bearer, and are not required to be carried by the D2D.
  • Step 518 After the D2D bearer is switched to the EPS bearer, optionally, the source end and the peer end request the eNB to release the D2D radio resource, and after the eNB decides, notify the source end and the peer end to release the D2D radio resource.
  • Step 519 The source end and the opposite end implement a D2D session on the EPS bearer.
  • This embodiment mainly describes that the D2D source and the peer end accessed by the neighboring eNB are performing D2D sessions through the EPS bearer. At this time, the source end moves and enters the D2D area.
  • the D2D terminal may initiate a D2D session switching request to the network side when checking the D2D area criticality.
  • the eNB may initiate a D2D session handover request to the MME when checking the D2D area criticality; and check whether the D2D area is critical for the MME to check whether the D2D area range satisfies the D2D session scenario. It is possible to decide whether to initiate a D2D session handover, and then notify the radio access network eNB to perform session switching.
  • the MME performs D2D communication check according to the D2D session handover indication and decides to initiate a session handover from the EPS bearer to the D2D bearer.
  • the network side notifies the terminal to perform session switching.
  • the source and the peer end transmit and receive the IP session packet from the D2D bearer, and optionally release the EPS bearer, and complete the session switching operation of the EPS bearer to the D2D bearer.
  • Step 601 Both the D2D source end and the D2D peer end are connected to the EPS network through the neighboring eNB, and the D2D source end and the opposite end are located in the range of the D2D area.
  • the network side establishes an EPS bearer for the source end and the terminal.
  • the D2D source and the terminal use the EPS bearer link for D2D sessions.
  • Step 602 The D2D source moves, and gradually enters the D2D area. At this time, if both the terminal and the network support the D2D service and the D2D capability, session switching is required for the high-QoS and low-cost communication services of the core network data to be effectively split and the terminal communication.
  • the D2D terminal checks whether the D2D area is satisfied, for example, the strength of the wireless signal of the other party can be checked.
  • the D2D terminal can initiate a session switching request to the network side to request to switch to the D2D bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 603 The network-side first eNB (or the second eNB, the document mainly describes the source end and the first eNB, and the process of initiating the session between the peer end and the second eNB is similar, and the description is not repeated) receiving the D2D session initiated by the terminal
  • the session switching request may be sent to the second eNB or the MME through the X2 interface with the second eNB or the S1 interface of the MME, requesting to switch to the D2D bearer.
  • the first eNB on the network side has the capability to check whether the D2D area range is satisfied according to the related information, For example, according to the location information in the measurement report of the terminal, or according to the D2D discovery mechanism of the wireless access side.
  • the first eNB may send a session switching request by using the X2 interface with the second eNB, where the session switching request carries information such as the source identifier, the peer identifier, and the D2D session switching indication, and requests the handover.
  • the session switching request carries information such as the source identifier, the peer identifier, and the D2D session switching indication
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 604 After receiving the session switching request of the first eNB, the second eNB sends the session switching request to the MME through the S1 interface.
  • Step 605 If there is no X2 interface between the eNBs, the first eNB may directly send a session handover request to the MME through the S1 interface, requesting to switch to the D2D bearer.
  • the session switching request carries information such as a source end identifier, a peer end identifier, and a D2D session switching indication.
  • Step 606 After receiving the session switching request, the MME performs D2D communication check on the source end and the terminal according to the D2D session switching request indication in the handover request, checks whether the D2D capability is available, and signs the D2D service. And checking the D2D area range of the source end and the terminal, whether the location of the terminal has met the condition of D2D session switching. If the check satisfies the requirements, the MME performs a D2D session switching operation.
  • Step 607 The MME sends a session handover command to the first eNB where the source end is located, and notifies the first eNB to perform session switching.
  • the network side MME has the ability to check whether the D2D area range of the terminal has met the session switching condition based on the related information, for example, the D2D discovery mechanism on the core network side.
  • the MME may decide to initiate a session switching operation.
  • the MME may send a session handover request to the eNB where the terminal is located.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 608 The first eNB allocates D2D radio resources to the source, including LTE spectrum resources, slot parameters, and QoS parameters.
  • Step 609 After the first eNB allocates the D2D radio resource to the source end, the first eNB sends a session switch command message to the source end, where the message includes information such as a D2D radio resource parameter, a peer end identifier, and an EPS bearer handover indication to the D2D bearer.
  • the session switching request or command carries information such as the source end identifier, the peer end identifier, and the D2D session switching indication.
  • Step 611 The second eNB allocates D2D radio resources to the source, including LTE spectrum resources, time slot parameters, and QoS parameters.
  • Step 612 The second eNB sends a session switch command message to the peer end, where the message includes information such as a D2D radio resource parameter, a source end identifier, and an EPS bearer handover indication to the D2D bearer.
  • the message includes information such as a D2D radio resource parameter, a source end identifier, and an EPS bearer handover indication to the D2D bearer.
  • Step 613 After receiving the D2D session switching command, the source end and the peer end establish a direct D2D bearer according to the identity of the other party, and send and receive IP data packets through the D2D bearer, and switch the session on the EPS bearer to the D2D bearer.
  • Step 614 615 The source end returns a session handover confirmation response to the first eNB, and the first eNB returns a session handover confirmation response to the MME.
  • Step 616 After receiving the session handover confirmation response, the MME may initiate a bearer deactivation request to the SGW/PGW to release the EPC bearer. Optionally, the MME sends an S1 release interface to the first eNB to request to release the radio bearer.
  • Steps 617 ⁇ 618 The peer end returns a session handover confirmation response to the second eNB, and the second eNB returns a session handover confirmation response to the MME.
  • Step 619 After receiving the session handover confirmation response, the MME may initiate a bearer deactivation request to the SGW/PGW to release the EPC bearer. Optionally, the MME sends an S1 release interface to the second eNB to request to release the radio bearer.
  • Step 620 After the session of the EPS bearer is successfully switched to the D2D bearer, optionally, the first eNB and the second eNB delete the RRC connection with the source end and the opposite end, and release the radio bearer resource.
  • the embodiment of the present invention further provides a direct communication terminal session switching device in a mobile communication network, which is applied to a D2D terminal.
  • the device mainly includes:
  • the D2D area range detecting module is configured to detect whether a range of the D2D area of the D2D terminal and the D2D end session currently in the session changes;
  • the session switching initiation module is configured to initiate to the network side when the range of the D2D area changes. D2D session switching request;
  • the session switching execution module is configured to receive a session switching command from the network side, and perform a corresponding session switching operation according to the session switching command.
  • the session switching initiation module is configured to carry, in the initiated D2D session switching request, the terminal identifier of the D2D terminal and the D2D peer end, and the D2D session switching request indication.
  • the D2D area range detecting module is configured to determine whether the D2D area range changes by checking the strength of the other party's wireless signal
  • the range of the D2D area changes, including: entering or leaving the D2D area with the opposite end of the D2D.
  • the device may further include:
  • a communication link establishing module is configured to establish a D2D bearer with the D2D peer end or establish an EPS bearer with the network side.
  • the embodiment of the present invention further provides a direct communication terminal session switching device in a mobile communication network, which is applied to the network side.
  • the device mainly includes:
  • the session switching processing module is configured to: when the range of the D2D area of the D2D terminal and the D2D peer that is in the session is changed, or according to the D2D session switching request, initiate a handover of the D2D bearer and the EPS bearer.
  • the session switching processing module is configured to: determine whether the range of the D2D area of the D2D terminal and the D2D peer is changed by:
  • the location information in the measurement report or the D2D discovery mechanism on the radio access side, or the D2D discovery mechanism on the core network side.
  • the session switching processing module is configured to: after the decision to initiate the handover of the D2D bearer and the EPS bearer, carry the terminal identifier of the D2D terminal and the D2D peer, and the D2D session switching indication in the session switching message, and The D2D terminal sends a session switching command with the D2D peer.
  • the device may further include:
  • the communication service resource allocation module is configured to allocate D2D communication service resources, including D2D bearer resources or EPS bearer resources, to the D2D terminal and the D2D peer end. Further, the device may further include:
  • the D2D communication service check module is configured to check whether the requested D2D session switch meets one of the following conditions or any combination thereof: the D2D area position of the D2D terminal and the D2D peer end, the D2D capability; the D2D capability of the network side; the D2D Whether the terminal and the D2D peer sign the D2D service.
  • the device may further include:
  • a paging module configured to: when the D2D terminal and the D2D peer are in an idle state, page the D2D terminal and the D2D peer according to the D2D terminal and the D2D peer terminal identifier in the session switching request It restores the connected state.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any particular combination of hardware and software.
  • D2D session and session switching are implemented under the premise of network control, so that the D2D session does not disconnect or the voice is bad due to the terminal moving, so that the user
  • the experience is not affected by the terminal mobile; at the same time, the data traffic of the network is effectively reduced, the network resources are optimized, and the user gets better communication service quality, low rate and other better application experience.

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Abstract

一种移动通信网络中直连通讯终端会话切换方法及装置，第一D2D终端与第二D2D终端进行会话过程中，当D2D区域范围发生变化时，网络侧根据D2D会话切换请求决策发起D2D承载与EPS承载的切换。本发明实施例，实现了在EPS网络中D2D承载与EPS承载之间的无缝切换，使用户不受因终端移动而产生断话或语音不良的影响，提高了用户体验。

Description

一种移动通信网络中直连通讯终端会话切换方法及装置
技术领域
本发明涉及移动通信技术领域， 尤其涉及一种移动通信网络中直连通讯 终端会话切换方法及装置。 背景技术
移动通信中，通讯可以发生在用户设备（User Equipment, 简称 UE ) (或 者也称为终端、或用户终端）和应用服务器（ Application Server,简称为 AS ) 之间， 也可以发生在两个用户设备之间。 两个用户设备之间的通讯， 可能通 过 AS中转， 也可能是两个用户设备之间通过端到端的的 IP数据流进行。
在移动通信中， 分组（Packet Service, 简称 PS ) 网络和演进分组系统 ( Evolved Packet System, 简称为 EPS )提供了基于 IP的数据通信。 UE的 IP 地址由网络中的 IP分配实体负责， 所有的 IP数据流均需要经过该 IP分配实 体。
图 1 是根据相关技术下 UE接入到 3GPP ( 3rd Generation Partnership Project,第三代合作伙伴计划）无线网络分组域的架构示意图。如图 1所示， 该架构涉及： UE、 UMTS陆地无线接入网 （UMTS Terrestrial Radio Access Network, 简称为 UTRAN ) 、 演进的陆地无线接入网 （Evolved UMTS, 简 称为 E-UTRAN ) 、 服务 GPRS支持节点 （ Serving GPRS Supporting Node, 简称为 SGSN )、移动性管理实体（ Mobile Management Entity,简称 MME )、 归属位置寄存器 （Home Location Register, 简称为 HLR ) /归属用户服务器 ( Home Subscriber Server, 简称为 HSS )、 服务网关（ Serving Gateway , 简 称 SGW )、分组数据网络网关（ Packet Data Network Gateway,简称为 PGW )、 网关 GPRS支持节点 （Gateway GPRS Supporting Node, 简称为 GGSN ) 、 AS。 其中， PGW、 GGSN即分别为 E-UTRAN、 UTRAN/GERAN下的 IP分 配实体， 可以将 GGSN、 PGW统称为公共数据网络网关。
UE可通过 UMTS、 E-UTRAN接入到核心网， 被分配 IP地址后， 才能 实现和应用服务器 AS、 其他终端进行 IP数据通讯。 在通讯过程中， IP数据 流经过基站后被转发到公共数据网络网关 （GGSN/PGW ) , 然后再由 GGSN/PGW根据 IP路由规则， 发送给 AS、 目的端 UE。 其中， UE到基站、 基站到公共数据网络网关 （GGSN/PGW )之间的通讯， 并不是基于 IP路由 规则， 而是基于专用数据隧道路由技术。 在整个过程中， 基站并不感知 IP层 的信息， 比如， 基站不知道 UE的 IP地址、 端口等信息。
随着智能手机广泛应用， 在移动网络中传输媒体数据流越来越频繁。 尤 为突出的是， 随着社交应用和基于位置的通讯应用越来越流行， 在同一个区 域内 （同一个基站下、 临近基站范围内） 的数据流量越来越大。 这些流量均 需要迂回到核心网的公共数据网络网关（GGSN/PGW ) , 因而大大增加了回 程带宽要求， 增大了 IP通讯的时延， 也加大了基站（E-UTRAN )及公共数 据网络网关（GGSN/PGW )的负荷负担。并且，随着移动宽带化越来越深入， 日益增长的 IP数据流量对无线基站（E-UTAN )及核心网的公共数据网络网 关 （ GGSN/PGW )也提出了更高的要求。
针对日益增多的流量问题， 需要能对特定的 IP流量进行必要的分流， 以 减轻对公共数据网关（GGSN/PGW )的负荷及对核心网的信令冲击。 现有方 案可以釆用基站进行分流的方式，UE访问 IT网站的 IP数据可直接通过基站 接入到外部数据网关。
随着智能手机的爆炸式增长， 网络已渐渐无法满足 IP流量增长需求， 因 此， 如何解决日益增长的 IP流量对网络带来的冲击是目前需要解决的问题。 业界目前正在讨论终端之间釆用 LTE 无线频段直接建立通信的方式（LTE Direct通信） ， 即在物理位置上临近的终端 （比如： lKm范围内） ， 利用运 营商 LTE频语资源建立点对点的直连无线通讯。终端间直连通讯是一种新兴 的无线通讯模式， 实现直连通讯的终端也是一种新型的 D2D ( Direct to Direct communication, 直连通讯 )终端， 这就需要 3GPP网络支持对该 D2D终端接 入到网络， 对该 D2D终端进行增强的移动性管理、 D2D认证及网络资源分 配等， 并且需要新定义临近终端的接入控制方法及系统， 保证临近终端之间 在网络控制下实现直连数据链路的 IP通信。
考虑减轻网络侧的流量负荷， 需要能够实现临近区域内的终端釆用 LTE 无线频段进行直接通信， IP数据流不经过基站及核心网环回， 以减轻网络侧 的流量负荷。 图 2是 D2D通信的场景之一， 即在 UE1和 UE2之间寻求建立 直连通讯链路的方案，是 D2D终端直接进行通信。该通信釆用通过调增功率 的突发脉冲技术， 以及类似 WIFI广播机制实现相互发现， 然后在网络控制 下建立 D2D终端间的直接数据通信， IP数据包的收发不经过基站与核心网。 但 D2D会话有区域位置范围限制， 因此当在临界区域时有 D2D承载与 EPS 承载互相切换的需求。
现有技术中， 釆用 EPS架构， 源端 UE1与对端 UE2在同一个 eNB中进 行会话， 当源端 UE1移动到另一个 eNB时需要进行会话切换， 参见图 3所 示， 此时的会话切换流程如下：
步骤 101 , 源端 UE1与对端 UE2在 EPS网络实现了通过 EPS承载进行 会话， 源端与对端都在第一 eNB无线接入网络。
步骤 102, 当源端从第一 eNB移动到第二 eNB时， 第一 eNB通过源端 UE1的测量报告， 发现源端已移动到第二 eNB, 第一 eNB就从 X2接口向第 二 eNB发送会话切换请求。
第二 eNB收到会话切换请求后， 与源端 UE1建立无线数据承载， 并将 会话请求发给 MME。
步骤 103 , 若不釆用步骤 102的 X2接口切换， 而釆用 S1接口切换的方 式， 第一 eNB需要将会话切换请求通过 S1接口发给 MME。
MME通过第二 eNB进行会话切换， 第二 eNB与源端 UE1建立无线数 据承载。
步骤 104 - 105 , MME通过 SGW/PGW进行承载修改； SGW获取承载 修改消息中的第二 eNB的 IP地址及隧道标识 , 建立起与第二 eNB的隧道数 据通道。
步骤 106, 源端与对端的会话切换成功， 源端 UE1可以通过第二 eNB发 送 IP包数据至第一 eNB的对端 UE2, 源端与对端在 EPS链路上进行会话。
当 D2D会话发生时，若源端或对端发生了移动，离开了 D2D区域范围， 此时可能因无线信号不良， 可能会发生 D2D会话断线或会话效果很差。 有 D2D承载向 EPS承载的切换需求； 反之亦然。 对于会话 D2D承载与 EPS承 载互相的切换， 与现有会话切换技术有很大不同， D2D会话需要切换时， 可 能源端与对端还是位于同一 eNB的， 因此 eNB无法根据测量报告中的信号 强弱进行切换。此外，在切换过程中，网络侧还需要知道源端及对端的信息， 为终端再次建立 D2D承载或 EPS承载，才能完成会话切换。 因此，对于 D2D 会话， 当终端在 EPS网络进行移动时， 如何解决 D2D承载与 EPS承载的无 缝切换，使 D2D会话不会因为终端的移动而发生断话或会话效果很差， 降低 用户体验， 是现有技术中亟需解决的问题。 发明内容
本发明解决的技术问题是提供一种移动通信网络中直连通讯终端会话切 换方法及装置， 实现在 EPS网络中 D2D承载与 EPS承载之间的无缝切换， 使用户不受因终端移动而产生断话或语音不良的影响， 提高用户体验。
为解决上述技术问题， 本发明提供了一种移动通信网络中直连通讯终端 会话切换方法，
第一直连通讯 (D2D)终端与第二 D2D终端进行会话过程中，当 D2D区域 范围发生变化时， 网络侧根据 D2D会话切换请求决策发起 D2D承载与演进 分组系统 (EPS)承载的切换。
优选地， 所述 D2D区域范围发生变化， 包括：
第一 D2D终端与第二 D2D终端进入或者离开 D2D区域。
优选地， 第一 D2D终端与第二 D2D终端进入 D2D区域时， 网络侧决策 发起 EPS承载到 D2D承载的切换；
第一 D2D终端与第二 D2D终端离开 D2D区域时，网络侧决策发起 D2D 承载到 EPS承载的切换。
优选地， 所述第一 D2D终端、 或者第二 D2D终端通过检查对方无线信 号的强弱， 判断出 D2D区域范围发生变化时， 向网络侧发起所述 D2D会话 切换请求；
或者， 网络侧的基站或者移动性管理实体 (MME)根据测量报告中的位置 信息、 或者无线接入侧的 D2D发现机制、 或者核心网侧的 D2D发现机制判 断出 D2D区域范围发生变化时， 发起所述 D2D会话切换请求； 其中，所述 D2D会话切换请求中包含所述第一 D2D终端与所述第二 D2D 终端的终端标识、 D2D会话切换指示。
优选地， 所述方法还包括：
所述网络侧根据所述 D2D会话切换请求， 对所述第一 D2D终端及所述 第二 D2D终端进行 D2D通信检查后， 决策发起所述 D2D承载与 EPS承载 的切换。
优选地， 所述 D2D通信检查， 包括以下之一或其任意组合： 所述第一 D2D终端与所述第二 D2D终端的 D2D区域位置、 D2D能力； 网络侧的 D2D 能力； 所述第一 D2D终端与所述第二 D2D终端是否签约 D2D业务。
优选地， 所述方法还包括：
网络侧决策发起所述 D2D承载与 EPS承载的切换后， 为所述第一 D2D 终端与所述第二 D2D终端分配 D2D 7 载资源或 EPS 7 载资源。
优选地， 所述方法还包括：
当所述第一 D2D终端或者所述第二 D2D终端处于空闲状态时， 网络侧 根据所述终端标识进行寻呼， 使所述第一 D2D终端或者所述第二 D2D终端 恢复连接态。
本发明还提供了一种移动通信网络中直连通讯终端会话切换装置， 应用 于 D2D终端， 所述装置包括：
D2D区域范围检测模块，设置为：检测 D2D终端与当前进行会话的 D2D 对端的 D2D区域范围是否发生变化；
会话切换发起模块， 设置为： 当 D2D区域范围发生变化时， 发起向网络 侧的 D2D会话切换请求；
会话切换执行模块， 设置为： 接收来自网络侧的会话切换命令， 并根据 所述会话切换命令进行相应的会话切换操作。
优选地，所述会话切换发起模块设置为： 在发起的所述 D2D会话切换请 求中携带本 D2D终端和 D2D对端的终端标识、以及 D2D会话切换请求指示。 优选地，所述 D2D区域范围检测模块设置为： 通过检查对方无线信号的 强弱， 判断 D2D区域范围是否发生变化；
其中，所述 D2D区域范围发生变化，包括：与 D2D对端进入或离开 D2D 区域。
优选地， 所述装置还包括：
通信链路建立模块， 设置为： 与 D2D对端之间建立 D2D承载、 或者与 网络侧建立 EPS承载。
本发明还提供了一种移动通信网络中直连通讯终端会话切换装置， 应用 于网络侧， 所述装置包括：
会话切换处理模块， 设置为： 当获知正在进行会话的 D2D终端与 D2D 对端的 D2D区域范围发生变化时、 或者根据 D2D会话切换请求， 决策发起 D2D承载与 EPS承载的切换。
优选地，所述会话切换处理模块设置为： 通过以下方式获知 D2D终端与 D2D对端的 D2D区域范围是否发生变化：
根据测量报告中的位置信息、或者无线接入侧的 D2D发现机制、或者核 心网侧的 D2D发现机制。
优选地， 所述会话切换处理模块设置为： 决策发起 D2D承载与 EPS承 载的切换后 ,在会话切换消息中携带所述 D2D终端与 D2D对端的终端标识、 及 D2D会话切换指示， 并向所述 D2D终端与 D2D对端发送会话切换命令。
优选地， 所述装置还包括：
通信服务资源分配模块，设置为：为所述 D2D终端与 D2D对端分配 D2D 通信服务资源， 包括 D2D承载资源或 EPS承载资源。
优选地， 所述装置还包括：
D2D通信服务检查模块， 设置为： 检查所请求的 D2D会话切换是否满 足如下条件之一或其任意组合：所述 D2D终端与 D2D对端的 D2D区域位置、 D2D能力； 网络侧的 D2D能力； 所述 D2D终端与 D2D对端是否签约 D2D 业务。 优选地， 所述装置还包括：
寻呼模块， 设置为： 当所述 D2D终端与 D2D对端处于空闲状态时， 根 据会话切换请求中的所述 D2D终端与 D2D对端的终端标识，对所述 D2D终 端与 D2D对端进行寻呼使其恢复连接态。
综上所述，釆用本发明实施例，在具有直连通讯的终端之间进行 D2D会 话中， 当终端发生了移动而离开或进入 D2D会话区域时， 实现了 D2D承载 与 EPS承载的无缝切换。 附图概述
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中：
图 1是根据相关技术下 UE接入到分组域的架构示意图；
图 2是釆用分组域架构， D2D终端实现 D2D直连通信的架构示意图； 图 3是现有技术中终端在 EPS网络进行会话切换的流程示意图； 图 4是本发明实施例一中 D2D终端与对端在同一 eNB下实现 D2D会话 切换的流程示意图；
图 5是本发明实施例二中 D2D终端与对端在同一 eNB下实现 D2D会话 切换的流程示意图；
图 6是本发明实施例三中 D2D终端与对端在同一 eNB下实现 D2D会话 切换的流程示意图；
图 7是本发明实施例四中 D2D终端与对端在相邻 eNB下实现 D2D会话 切换的流程示意图；
图 8是本发明实施例五中 D2D终端与对端在相邻 eNB下实现 D2D会话 切换的流程示意图；
图 9为本发明实施例的网络侧及 D2D终端侧移动通信网络中 D2D终端 会话切换装置的示意框图。 本发明的较佳实施方式
本实施方式提供一种移动通信网络中 D2D终端会话切换的方法，其目的 在于， 在 D2D源端及 D2D对端使用 D2D承载或 EPS承载进行会话中， 当 终端发生了移动，离开或进入了 D2D区域范围时，为保证用户体验不受影响， 3GPP 网络需要提供无缝的会话切换服务， 使用户的会话质量不受终端移动 的影响。
本实施方式提供的移动通信网络中 D2D终端会话切换的方法，釆用如下 方案：
第一 D2D终端与第二 D2D终端进行会话过程中，当 D2D区域范围发生 变化时， 网络侧根据 D2D会话切换请求决策发起 D2D承载与 EPS承载的切 换。
进一步地， 所述的 D2D区域范围发生变化， 包括：
第一 D2D终端与第二 D2D终端进入、 或者离开 D2D区域。
进一步地，
第一 D2D终端与第二 D2D终端进入 D2D区域时， 网络侧决策发起 EPS 承载到 D2D承载的切换；
第一 D2D终端与第二 D2D终端离开 D2D区域时，网络侧决策发起 D2D 承载到 EPS承载的切换。
进一步地， 所述第一 /第二 D2D终端， 或者网络侧 eNB、 MME任意之一 都可以根据自身能力判断 D2D区域范围是否发生变化。
进一步地， 网络侧判断出 D2D区域范围发生变化时， 发起所述 D2D会 话切换请求， 并决策发起 D2D承载与 EPS承载的切换。
进一步地， 所述第一 /第二 D2D终端判断出 D2D区域范围发生变化时， 向网络侧 eNB/MME发起所述 D2D会话切换请求；
所述 D2D会话切换请求中包含对端的终端标识、 D2D会话切换指示。 进一步地， 网络侧根据所述 D2D会话切换指示进行 D2D通信检查后， 决策发起 D2D承载与 EPS承载的切换。
所述的 D2D通信检查包括： 检查第一 /第二 D2D终端是否具有 D2D业 务能力、 以及第一 /第二 D2D终端是否进入或者离开 D2D区域范围的位置检 查， 等。
更具体地， 上述方案包括如下主要内容：
当在同一 eNB或相邻 eNB接入的 D2D源端及对端正在通过 D2D承载 进行 D2D会话， 此时源端或对端发生了移动， 离开了 D2D区域。 如果终端 有能力检查 D2D区域范围是否发生变化，当 D2D终端发现 D2D区域临界时 就向网络侧发起 D2D会话切换请求， 请求从 D2D承载切换到 EPS承载， 防 止因终端之间距离过大导致 D2D会话中断。 D2D会话切换请求中需要携带 对方的终端标识， 通知网络侧是与哪个终端在进行会话。 D2D会话切换请求 中还需要携带 D2D会话切换指示， 表明是一个 D2D会话的切换； 对于网络 侧来说， 如果无线接入网络 eNB有能力检查 D2D区域范围是否发生变化， 当 eNB发现 D2D区域临界时可以向 MME发起 D2D会话切换请求， D2D会 话切换请求中也需要携带源端标识、 对端标识及 D2D会话切换指示。 同样， 如果移动性管理网元 MME有能力检查 D2D区域范围是否发生变化，当 MME 发现 D2D区域临界时也决策发起 D2D会话切换请求， 然后通知无线接入网 络 eNB进行会话切换。 MME收到会话切换请求或决策发起会话请求时， MME 根据 D2D会话切换指示进行 D2D通信检查并决策发起从 D2D承载到 EPS 承载的会话切换。 D2D通信检查包括检查终端及网络是否具有 D2D业务能 力， 以及终端是否进入或离开 D2D区域范围的位置检查。 若 D2D源端或对 端处于 IDLE状态， 网络侧需要先 paging (寻呼 )终端使终端接入到网络并 建立 EPS承载， 使终端恢复连接态。 网络侧执行 D2D会话切换， 根据会话 切换请求中的终端及源端标识 , 为 D2D源端及 D2D对端分配资源 , 并通知 D2D源端及对端执行会话切换。 源端及对端将 IP会话包从 D2D承载切换到 从 EPS承载上进行收发， 并可选的释放 D2D承载， 完成 D2D承载向 EPS承 载的会话切换操作。
当在同一 eNB或相邻 eNB接入的 D2D源端及对端正在通过 EPS进行 D2D会话时， 此时源端或对端发生了移动， 进入了 D2D区域范围。 为使核 心网数据有效分流及为终端通信提供更高 QoS、 更低资费通信服务， 需要进 行会话切换。 如果终端有能力检查 D2D区域范围是否发生变化， 当 D2D终 端发现 D2D区域临界时就向网络侧发起 D2D会话切换请求， 请求从 EPS承 载切换到 D2D承载， 使终端之间釆用更高通话质量的 D2D承载进行会话。 D2D会话切换请求中需要携带对方的终端标识， 通知网络侧是与哪个终端在 进行会话。 D2D会话切换请求中还需要携带 D2D会话切换指示， 表明是一 个 D2D会话的切换； 对于网络侧来说， 如果无线接入网络 eNB有能力检查 D2D区域范围是否发生变化， 当 eNB发现 D2D区域临界时可以向 MME发 起 D2D会话切换请求， D2D会话切换请求中也需要携带源端标识、 对端标 识及 D2D会话切换指示。 同样，如果移动性管理网元 MME有能力检查 D2D 区域范围是否发生变化， 当 MME发现 D2D区域临界时也决策发起 D2D会 话切换请求， 然后通知无线接入网络 eNB进行会话切换。 MME收到会话切 换请求或决策发起会话请求时， MME根据 D2D会话切换指示进行 D2D通 信检查并决策发起从 D2D承载到 EPS承载的会话切换。 D2D通信检查包括 检查终端及网络是否具有 D2D业务能力， 以及终端是否进入或离开 D2D区 域范围的位置检查。 网络侧执行 D2D会话切换，根据会话切换请求中的终端 及源端标识， 为 D2D源端及 D2D对端分配资源 , 并通知 D2D源端及对端执 行会话切换。 源端及对端将 IP会话包从 EPS承载切换到从 D2D承载上进行 收发，并可选的释放 EPS承载，完成 EPS承载向 D2D承载的会话切换操作。
釆用上述方案， 3GPP网络能对 D2D终端发起的业务请求进行 D2D通信 服务检查， 并根据 D2D通信服务检查的结果决定是否为终端分配 D2D会话 的通信资源， 并实现 D2D会话切换。 网络侧若决策为 D2D终端进行会话切 换，则为本次会话切换提供 D2D会话的通信资源，终端间根据网络侧提供的 通信资源完成 D2D承载与 EPS承载的切换。
以下将结合附图及具体实施例对本发明技术方案的实施作进一步详细描 述。 需要说明的是， 在不冲突的情况下， 本申请中的实施例及实施例中的特 征可以相互任意组合。 实施例一
本实施例主要描述在同一 eNB接入的 D2D源端及对端正在通过 D2D承 载进行 D2D会话， 此时源端发生了移动， 离开了 D2D区域。 对于终端检测 D2D区域范围是否满足 D2D会话的场景， D2D终端检查 D2D区域临界时可 以向网络侧发起 D2D会话切换请求。对于网络侧 eNB检测 D2D区域范围是 否满足 D2D会话的场景， eNB检查 D2D区域临界时可以向 MME发起 D2D 会话切换请求； 对于网络侧 MME检查 D2D区域范围否满足 D2D会话的场 景， MME检查 D2D区域临界时可以决策是否发起 D2D会话切换， 然后通 知无线接入网络 eNB进行会话切换。 MME根据 D2D会话切换指示进行 D2D 通信检查并决策发起从 D2D承载到 EPS承载的会话切换。 若终端及对端的 EPS承载连接一直保持， 网络侧通知终端执行会话切换， 源端及对端将 IP会 话包从 EPS承载上进行收发， 并释放 D2D承载， 完成 D2D承载向 EPS承载 的会话切换操作。
参见图 4所示， 本实施例具体步骤描述如下：
步骤 201： D2D源端与 D2D对端都通过同一 eNB接入到 EPS网络， 网 络侧为源端及终端建立了 EPS承载及 D2D承载。 D2D源端及终端釆用 D2D 链路进行 D2D会话。
步骤 202： D2D源端进行移动， 逐渐离开 D2D区域范围。 此时为防止会 话中断， 需要进行会话切换。
如果 D2D终端自行检查 D2D区域范围是否满足， 例如可以检查对方的 无线信号的强弱， 当发现 D2D区域范围临界时， D2D终端可向网络侧发起 会话切换请求， 请求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 203: 网络侧 eNB收到终端发起的 D2D会话切换请求后， 通过与 MME的 S1接口， 向 MME发送会话切换请求。
如果网络侧 eNB有能力根据相关信息检查 D2D区域范围是否满足， 例 如根据终端的测量报告中的位置信息， 或根据无线接入侧的 D2D发现机制。 当 eNB发现 D2D区域范围临界时， eNB可向 MME发起会话切换请求， 请 求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 204: MME收到会话切换请求后， 根据切换请求中的 D2D会话切 换请求指示， 对源端及终端进行 D2D通信检查， 检查是否具有 D2D能力并 签约了 D2D业务。 以及对源端及终端的 D2D区域范围进行检查， 是否终端 的所在位置已满足 D2D会话切换的条件。 如果检查满足要求， MME就进行 D2D会话切换操作。
步骤 205: MME向终端所在的 eNB发送会话切换命令， 通知 eNB进行 会话切换。
如果终端或 eNB未向 MME发送会话切换请求 , 网络侧 MME有能力根 据相关信息检查终端的 D2D区域范围是否已满足会话切换条件，例如核心网 侧的 D2D发现机制。 当 MME发现 D2D区域范围临界时， MME可决策发 起会话切换操作。 MME此时可向终端所在的 eNB发送会话切换请求。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 206: eNB检查源端是否已建立无线数据承载， 若已建立无线数据 承载， eNB向源端发送会话切换命令， 通知源端进行会话切换， 从 D2D承 载切换到 EPS承载。 会话切换命令中携带对端标识， D2D承载向 EPS承载 切换的指示等信息。
步骤 207: 源端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 对端此时通过 EPS承载也能收到源端的 IP数据包。
步骤 208~209： 源端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。 eNB返回的确认响应中可携带源端标识、 为源端分配的 eNB的 IP地址及隧道 ID信息。
步骤 210: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 恢复源端 EPS承载的下行承载链路。
步骤 211 : EPS承载上下行链路恢复后， 源端的 IP数据包可以通过 EPS 承载收发， 不在需要通过 D2D承载。
步骤 212: MME向对端所在的 eNB发送会话切换命令或请求，通知 eNB 进行会话切换。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 213: eNB检查对端是否已建立无线数据承载， 若已建立无线数据 承载， eNB向对端发送会话切换命令， 通知对端进行会话切换， 从 D2D承 载切换到 EPS承载。 会话切换命令中携带源端标识， D2D承载向 EPS承载 切换的指示等信息。
步骤 214: 对端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 源端此时通过 EPS承载也能收到对端的 IP数据包。
步骤 215~216： 对端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。 eNB返回的确认响应中可携带对端标识、 为对端分配的 eNB的 IP地址及隧道 ID信息。
步骤 217: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 恢复对端 EPS承载的下行承载链路。
步骤 218: EPS承载上下行链路恢复后， 源端的 IP数据包可以通过 EPS 承载收发， 不在需要通过 D2D承载。
步骤 219: D2D承载切换到 EPS承载后， 可选的， 源端及对端向 eNB 请求释放 D2D无线资源， eNB决策后通知源端及对端释放 D2D无线资源。
实施例二
本实施例主要描述在同一 eNB接入的 D2D源端及对端正在通过 D2D承 载进行 D2D会话， 此时源端发生了移动， 离开了 D2D区域。 对于终端检测 D2D区域范围是否满足 D2D会话的场景， D2D终端检查 D2D区域临界时可 以向网络侧发起 D2D会话切换请求。对于网络侧 eNB检测 D2D区域范围是 否满足 D2D会话的场景， eNB检查 D2D区域临界时可以向 MME发起 D2D 会话切换请求； 对于网络侧 MME检查 D2D区域范围否满足 D2D会话的场 景， MME检查 D2D区域临界时可以决策是否发起 D2D会话切换， 然后通 知无线接入网络 eNB进行会话切换。 MME根据 D2D会话切换指示进行 D2D 通信检查并决策发起从 D2D承载到 EPS承载的会话切换。 若终端及对端处 于 idle态， EPS承载连接中断， 网络先寻呼终端，使终端接入到网络建立 EPS 承载。 网络侧通知终端执行会话切换， 源端及对端将 IP会话包从 EPS承载 上进行收发，并释放 D2D承载，完成 D2D承载向 EPS承载的会话切换操作。
参见图 5所示， 本实施例具体步骤描述如下：
步骤 301 : D2D源端与 D2D对端都通过同一 eNB接入到 EPS网络， 网 络侧为源端及终端建立了 D2D承载， 源端及对端处于 IDLE状态， 此时 EPS 承载释放。 D2D源端及终端釆用 D2D链路进行 D2D会话。
步骤 302： D2D源端进行移动， 逐渐离开 D2D区域范围。 此时为防止会 话中断， 需要进行会话切换。
如果 D2D终端自行检查 D2D区域范围是否满足， 例如可以检查对方的 无线信号的强弱， 当发现 D2D区域范围临界时， D2D终端可向网络侧发起 会话切换请求， 请求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 303: 网络侧 eNB收到终端发起的 D2D会话切换请求后， 通过与 MME的 S1接口， 向 MME发送会话切换请求。
如果网络侧 eNB有能力根据相关信息检查 D2D区域范围是否满足， 例 如根据终端的测量报告中的位置信息， 或根据无线接入侧的 D2D发现机制。 当 eNB发现 D2D区域范围临界时， eNB可向 MME发起会话切换请求， 请 求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 304: MME收到会话切换请求后， 根据切换请求中的 D2D会话切 换请求指示， 对源端及终端进行 D2D通信检查， 检查是否具有 D2D能力并 签约了 D2D业务。 以及对源端及终端的 D2D区域范围进行检查， 是否终端 的所在位置已满足 D2D会话切换的条件。 如果检查满足要求， MME就进行 D2D会话切换操作。
步骤 305: MME向终端所在的 eNB发送会话切换命令， 通知 eNB进行 会话切换。
如果终端或 eNB未向 MME发送会话切换请求 , 网络侧 MME有能力根 据相关信息检查终端的 D2D区域范围是否已满足会话切换条件，例如核心网 侧的 D2D发现机制。 当 MME发现 D2D区域范围临界时， MME可决策发 起会话切换操作。 MME此时可向终端所在的 eNB发送会话切换请求。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 306: 若源端处于 idle状态， 未建立 EPS承载， 网络侧对源端进行 寻呼， 激活终端接入网络并建立 EPS承载。
步骤 307: 源端收到寻呼后， 向 eNB发送接入请求， 请求重新接入到网 络， eNB将接入请求发给 MME, MME通知 eNB为源端建立无线数据承载。
MME向 SGW/PGW发送承载建立请求， 在核心网侧建立 EPC承载， 最终建 立起 EPS承载。
步骤 308: eNB检查源端是否已建立无线数据承载， 若已建立无线数据 承载， eNB向源端发送会话切换命令， 通知源端进行会话切换， 从 D2D承 载切换到 EPS承载。 会话切换命令中携带对端标识， D2D承载向 EPS承载 切换的指示等信息。
步骤 309: 源端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 对端此时通过 EPS承载也能收到源端的 IP数据包。
步骤 310~311： 源端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。 eNB返回的确认响应中可携带源端标识、 为源端分配的 eNB的 IP地址及隧道 ID信息。
步骤 312: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 修改源端 EPS承载的下行承载链路。
步骤 313: EPS承载上下行链路正常后， 源端的 IP数据包可以通过 EPS 承载收发， 不在需要通过 D2D承载。
步骤 314: MME向对端所在的 eNB发送会话切换命令或请求，通知 eNB 进行会话切换。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 315: 若对端处于 idle状态， 未建立 EPS承载， 网络侧对对端进行 寻呼， 激活终端接入网络并建立 EPS承载。
步骤 316: 对端收到寻呼后， 向 eNB发送接入请求， 请求重新接入到网 络， eNB将接入请求发给 MME, MME通知 eNB为对端建立无线数据承载。
MME向 SGW/PGW发送承载建立请求， 在核心网侧建立 EPC承载， 最终建 立起 EPS承载。
步骤 317: eNB检查对端是否已建立无线数据承载， 若已建立无线数据 承载， eNB向对端发送会话切换命令， 通知对端进行会话切换， 从 D2D承 载切换到 EPS承载。 会话切换命令中携带源端标识， D2D承载向 EPS承载 切换的指示等信息。
步骤 318: 对端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 源端此时通过 EPS承载也能收到对端的 IP数据包。
步骤 319~320： 对端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。 eNB返回的确认响应中可携带对端标识、 为对端分配的 eNB的 IP地址及隧道 ID信息。
步骤 321 : MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 修改对端 EPS承载的下行承载链路。
步骤 322: EPS承载上下行链路正常后， 源端的 IP数据包可以通过 EPS 承载收发， 不在需要通过 D2D承载。
步骤 323: D2D承载切换到 EPS承载后， 可选的， 源端及对端向 eNB 请求释放 D2D无线资源， eNB决策后通知源端及对端释放 D2D无线资源。 实施例三
本实施例主要描述在同一 eNB接入的 D2D源端及对端正在通过 EPS承 载进行 D2D会话， 此时源端发生了移动， 进入了 D2D区域。 对于终端检测 D2D区域范围是否满足 D2D会话的场景， D2D终端检查 D2D区域临界时可 以向网络侧发起 D2D会话切换请求。对于网络侧 eNB检测 D2D区域范围是 否满足 D2D会话的场景， eNB检查 D2D区域临界时可以向 MME发起 D2D 会话切换请求； 对于网络侧 MME检查 D2D区域范围否满足 D2D会话的场 景， MME检查 D2D区域临界时可以决策是否发起 D2D会话切换， 然后通 知无线接入网络 eNB进行会话切换。 MME根据 D2D会话切换指示进行 D2D 通信检查并决策发起从 EPS承载到 D2D承载的会话切换。 网络侧通知终端 执行会话切换， 源端及对端将 IP会话包从 D2D承载上进行收发， 并可选的 释放 EPS承载， 完成 EPS承载向 D2D承载的会话切换操作。
参见图 6所示， 本实施例具体步骤描述如下：
步骤 401： D2D源端与 D2D对端都通过同一 eNB接入到 EPS网络， 网 络侧为源端及终端建立了 EPS承载。 D2D源端及终端釆用 EPS承载链路进 行 D2D会话。
步骤 402: D2D源端进行移动， 逐渐进入 D2D区域范围。 此时若终端及 网络都支持 D2D业务及 D2D能力， 为使核心网数据有效分流及终端通信的 高 QoS、 低资费通信服务， 需要进行会话切换。
如果 D2D终端自行检查 D2D区域范围是否满足， 例如可以检查对方的 无线信号的强弱， 当发现 D2D区域范围临界时， D2D终端可向网络侧发起 会话切换请求， 请求切换到 D2D承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 403: 网络侧 eNB收到终端发起的 D2D会话切换请求后， 通过与 MME的 S1接口， 向 MME发送会话切换请求。
如果网络侧 eNB有能力根据相关信息检查 D2D区域范围是否满足， 例 如根据终端的测量报告中的位置信息， 或根据无线接入侧的 D2D发现机制。 当 eNB发现 D2D区域范围临界时， eNB可向 MME发起会话切换请求， 请 求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 404: MME收到会话切换请求后， 根据切换请求中的 D2D会话切 换请求指示， 对源端及终端进行 D2D通信检查， 检查是否具有 D2D能力并 签约了 D2D业务。 以及对源端及终端的 D2D区域范围进行检查， 是否终端 的所在位置已满足 D2D会话切换的条件。 如果检查满足要求， MME就进行 D2D会话切换操作。
步骤 405: MME向终端所在的 eNB发送会话切换命令， 通知 eNB进行 会话切换。
如果终端或 eNB未向 MME发送会话切换请求 , 网络侧 MME有能力根 据相关信息检查终端的 D2D区域范围是否已满足会话切换条件，例如核心网 侧的 D2D发现机制。 当 MME发现 D2D区域范围临界时， MME可决策发 起会话切换操作。 MME此时可向终端所在的 eNB发送会话切换请求。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 406: eNB为源端及对端分配 D2D无线资源，包括 LTE频谱资源， 时隙参数， QoS参数等信息。
步骤 407: eNB为终端分配 D2D无线资源后， 向源端发送会话切换命令 消息， 消息中包含 D2D无线资源参数， 对端标识， 以及 EPS承载向 D2D承 载切换指示等信息。
步骤 408: eNB向对端发送会话切换命令消息， 消息中包含 D2D无线资 源参数， 源端端标识， 以及 EPS承载向 D2D承载切换指示等信息。
步骤 409: 源端及对端收到 D2D会话切换命令后， 根据对方的标识建立 起直连的 D2D承载，并通过 D2D承载互相收发 IP数据包，将 EPS承载上的 会话切换到 D2D承载上。
步骤 410~411： 源端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。
步骤 412: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载去活请求， 释放 EPC承载； 可选的， 向 eNB发送 S1释放接口， 请 求释放无线承载。
步骤 413~414： 对端向 eNB返回会话切换确认响应 , eNB向 MME返回 会话切换确认响应。
步骤 415: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载去激活请求， 释放 EPC承载； 可选的， 向 eNB发送 S1释放接口， 请求释放无线承载。
步骤 416: EPS承载向 D2D承载的会话切换成功后， 可选的， eNB删除 与源端及对端的 RRC连接， 释放无线承载资源。
实施例四
本实施例主要描述在相邻 eNB接入的 D2D源端及对端正在通过 D2D承 载进行 D2D会话， 此时源端发生了移动， 离开了 D2D区域。 对于终端检测 D2D区域范围是否满足 D2D会话的场景， D2D终端检查 D2D区域临界时可 以向网络侧发起 D2D会话切换请求。对于网络侧 eNB检测 D2D区域范围是 否满足 D2D会话的场景， eNB检查 D2D区域临界时可以向 MME发起 D2D 会话切换请求； 对于网络侧 MME检查 D2D区域范围否满足 D2D会话的场 景， MME检查 D2D区域临界时可以决策是否发起 D2D会话切换， 然后通 知无线接入网络 eNB进行会话切换。 MME根据 D2D会话切换指示进行 D2D 通信检查并决策发起从 D2D承载到 EPS承载的会话切换。 若终端及对端处 于 idle态， EPS承载连接中断， 网络先寻呼终端，使终端接入到网络建立 EPS 承载。 网络侧通知终端执行会话切换， 源端及对端将 IP会话包从 EPS承载 上进行收发，并释放 D2D承载，完成 D2D承载向 EPS承载的会话切换操作。
参见图 7所示， 本实施例具体步骤描述如下：
步骤 501 : D2D源端与 D2D对端都通过相邻 eNB接入到 EPS网络， D2D 源端从第一 eNB接入， D2D对端从第二 eNB接入， D2D源端及对端处于 D2D区域范围。 网络侧为源端及终端建立了 D2D承载， 源端及对端可处于 IDLE状态， 此时 EPS承载释放。 D2D源端及终端釆用 D2D链路进行 D2D 会话。
步骤 502： D2D源端进行移动， 逐渐离开 D2D区域范围。 此时为防止会 话中断， 需要进行会话切换。
如果 D2D终端自行检查 D2D区域范围是否满足， 例如可以检查对方的 无线信号的强弱， 当发现 D2D区域范围临界时， D2D终端可向网络侧发起 会话切换请求， 请求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 503： 网络侧第一 eNB (或第二 eNB , 此文稿主要描述源端及第一 eNB, 对端及第二 eNB发起会话的流程类似， 不再进行重复描述）收到终端 发起的 D2D会话切换请求后， 可以通过与第二 eNB的 X2接口， 或与 MME 的 S1接口，向第二 eNB或 MME发送会话切换请求，请求切换到 EPS承载。
如果网络侧第一 eNB有能力根据相关信息检查 D2D区域范围是否满足， 例如根据终端的测量报告中的位置信息，或根据无线接入侧的 D2D发现机制。 当第一 eNB发现 D2D区域范围临界时， 第一 eNB可通过与第二 eNB的 X2 接口发送会话切换请求，会话切换请求中携带源端标识，对端标识及 D2D会 话切换指示等信息， 请求切换到 EPS承载。
步骤 504: 第二 eNB收到第一 eNB的会话切换请求后，将该会话切换请 求通过 S1接口发给 MME。
步骤 505: 如果 eNB之间没有 X2接口， 第一 eNB可通过 S1接口直接 将会话切换请求发给 MME, 请求切换到 EPS承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 506: MME收到会话切换请求后， 根据切换请求中的 D2D会话切 换请求指示， 对源端及终端进行 D2D通信检查， 检查是否具有 D2D能力并 签约了 D2D业务。 以及对源端及终端的 D2D区域范围进行检查， 是否终端 的所在位置已满足 D2D会话切换的条件。 如果检查满足要求， MME就进行 D2D会话切换操作。
步骤 507: MME向源端所在的第一 eNB发送会话切换命令， 通知第一 eNB进行会话切换。 如果终端或 eNB未向 MME发送会话切换请求， 网络侧 MME有能力根 据相关信息检查终端的 D2D区域范围是否已满足会话切换条件，例如核心网 侧的 D2D发现机制。 当 MME发现 D2D区域范围临界时， MME可决策发 起会话切换操作。 MME此时可向终端所在的 eNB发送会话切换请求。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 508: 若源端处于 idle状态， 未建立 EPS承载， 网络侧对源端进行 寻呼， 激活终端接入网络并建立 EPS承载。
源端收到寻呼后，向第一 eNB发送接入请求，请求重新接入到网络， eNB 将接入请求发给 MME , MME通知 eNB为源端建立无线数据承载。 MME向 SGW/PGW发送承载建立请求， 在核心网侧建立 EPC承载， 最终建立起 EPS 承载。
第一 eNB检查源端是否已建立无线数据承载， 若已建立无线数据承载， 第一 eNB向源端发送会话切换命令， 通知源端进行会话切换， 从 D2D承载 切换到 EPS承载。 会话切换命令中携带对端标识， D2D承载向 EPS承载切 换的指示等信息。
步骤 509: 源端向第一 eNB返回会话切换确认响应 , 第一 eNB向 MME 返回会话切换确认响应。 第一 eNB返回的确认响应中可携带源端标识、 为源 端分配的 eNB的 IP地址及隧道 ID信息。
步骤 510: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 修改源端 EPS承载的下行承载链路， 保证下行数据可通 过 EPS承载发起源端。
步骤 511 : 源端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 对端此时通过 EPS承载也能收到源端的 IP数据包。
EPS承载上下行链路正常后 ,源端的 IP数据包可以通过 EPS承载收发， 不在需要通过 D2D承载。
步骤 512: MME向对端所在的第二 eNB发送会话切换命令或请求， 通 知第二 eNB进行会话切换。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 513: 若对端处于 idle状态， 未建立 EPS承载， 网络侧对对端进行 寻呼， 激活终端接入网络并建立 EPS承载。
步骤 514: 对端收到寻呼后， 向第二 eNB发送接入请求， 请求重新接入 到网络， 第二 eNB将接入请求发给 MME , MME通知 eNB为对端建立无线 数据承载。 MME向 SGW/PGW发送承载建立请求， 在核心网侧建立 EPC承 载， 最终建立起 EPS承载。
第二 eNB检查对端是否已建立无线数据承载， 若已建立无线数据承载， 第二 eNB向对端发送会话切换命令， 通知对端进行会话切换， 从 D2D承载 切换到 EPS承载。 会话切换命令中携带源端标识， D2D承载向 EPS承载切 换的指示等信息。
步骤 515: 对端向第二 eNB返回会话切换确认响应 , 第二 eNB向 MME 返回会话切换确认响应。 第二 eNB返回的确认响应中可携带源端标识、 为源 端分配的第二 eNB的 IP地址及隧道 ID信息。
步骤 516: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载修改请求， 修改源端 EPS承载的下行承载链路， 保证下行数据可通 过 EPS承载发起对端。
步骤 517: 对端再通过 D2D承载发送 IP数据包的同时， 也向 EPS承载 转发 IP数据包， 如 D2D承载中断， 源端此时通过 EPS承载也能收到对端的 IP数据包。
EPS承载上下行链路正常后，对端的 IP数据包可以通过 EPS承载收发， 不在需要通过 D2D承载。
步骤 518: D2D承载切换到 EPS承载后， 可选的， 源端及对端向 eNB 请求释放 D2D无线资源， eNB决策后通知源端及对端释放 D2D无线资源。
步骤 519: 源端及对端在 EPS承载上实现 D2D会话。 实施例五
本实施例主要描述在相邻 eNB接入的 D2D源端及对端正在通过 EPS承 载进行 D2D会话， 此时源端发生了移动， 进入了 D2D区域。 对于终端检测 D2D区域范围是否满足 D2D会话的场景， D2D终端检查 D2D区域临界时可 以向网络侧发起 D2D会话切换请求。对于网络侧 eNB检测 D2D区域范围是 否满足 D2D会话的场景， eNB检查 D2D区域临界时可以向 MME发起 D2D 会话切换请求； 对于网络侧 MME检查 D2D区域范围否满足 D2D会话的场 景， MME检查 D2D区域临界时可以决策是否发起 D2D会话切换， 然后通 知无线接入网络 eNB进行会话切换。 MME根据 D2D会话切换指示进行 D2D 通信检查并决策发起从 EPS承载到 D2D承载的会话切换。 网络侧通知终端 执行会话切换， 源端及对端将 IP会话包从 D2D承载上进行收发， 并可选的 释放 EPS承载， 完成 EPS承载向 D2D承载的会话切换操作。
参见图 8所示， 本实施例具体步骤描述如下：
步骤 601 : D2D源端与 D2D对端都通过相邻 eNB接入到 EPS网络， D2D 源端及对端位于 D2D区域范围之夕卜。网络侧为源端及终端建立了 EPS承载。 D2D源端及终端釆用 EPS承载链路进行 D2D会话。
步骤 602: D2D源端进行移动， 逐渐进入 D2D区域范围。 此时若终端及 网络都支持 D2D业务及 D2D能力， 为使核心网数据有效分流及终端通信的 高 QoS、 低资费通信服务， 需要进行会话切换。
如果 D2D终端自行检查 D2D区域范围是否满足， 例如可以检查对方的 无线信号的强弱， 当发现 D2D区域范围临界时， D2D终端可向网络侧发起 会话切换请求， 请求切换到 D2D承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 603： 网络侧第一 eNB (或第二 eNB , 此文稿主要描述源端及第一 eNB, 对端及第二 eNB发起会话的流程类似， 不再进行重复描述）收到终端 发起的 D2D会话切换请求后， 可以通过与第二 eNB的 X2接口， 或与 MME 的 S1接口，向第二 eNB或 MME发送会话切换请求，请求切换到 D2D承载。
如果网络侧第一 eNB有能力根据相关信息检查 D2D区域范围是否满足， 例如根据终端的测量报告中的位置信息，或根据无线接入侧的 D2D发现机制。 当第一 eNB发现 D2D区域范围临界时， 第一 eNB可通过与第二 eNB的 X2 接口发送会话切换请求，会话切换请求中携带源端标识，对端标识及 D2D会 话切换指示等信息， 请求切换到 D2D承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 604: 第二 eNB收到第一 eNB的会话切换请求后，将该会话切换请 求通过 S1接口发给 MME。
步骤 605: 如果 eNB之间没有 X2接口， 第一 eNB可通过 S1接口直接 将会话切换请求发给 MME, 请求切换到 D2D承载。
会话切换请求中携带源端标识， 对端标识及 D2D会话切换指示等信息。 步骤 606: MME收到会话切换请求后， 根据切换请求中的 D2D会话切 换请求指示， 对源端及终端进行 D2D通信检查， 检查是否具有 D2D能力并 签约了 D2D业务。 以及对源端及终端的 D2D区域范围进行检查， 是否终端 的所在位置已满足 D2D会话切换的条件。 如果检查满足要求， MME就进行 D2D会话切换操作。
步骤 607: MME向源端所在的第一 eNB发送会话切换命令， 通知第一 eNB进行会话切换。
如果终端或 eNB未向 MME发送会话切换请求 , 网络侧 MME有能力根 据相关信息检查终端的 D2D区域范围是否已满足会话切换条件，例如核心网 侧的 D2D发现机制。 当 MME发现 D2D区域范围临界时， MME可决策发 起会话切换操作。 MME此时可向终端所在的 eNB发送会话切换请求。
会话切换请求或命令中携带源端标识，对端标识及 D2D会话切换指示等 信息。
步骤 608: 第一 eNB为源端分配 D2D无线资源， 包括 LTE频谱资源， 时隙参数， QoS参数等信息。
步骤 609: 第一 eNB为源端分配 D2D无线资源后， 向源端发送会话切 换命令消息， 消息中包含 D2D无线资源参数， 对端标识， 以及 EPS承载向 D2D承载切换指示等信息。 步骤 610: MME向对端所在的第二 eNB发送会话切换命令， 通知第二 eNB进行会话切换。 会话切换请求或命令中携带源端标识， 对端标识及 D2D 会话切换指示等信息。
步骤 611 : 第二 eNB为源端分配 D2D无线资源， 包括 LTE频谱资源， 时隙参数， QoS参数等信息。
步骤 612: 第二 eNB向对端发送会话切换命令消息， 消息中包含 D2D 无线资源参数， 源端标识， 以及 EPS承载向 D2D承载切换指示等信息。
步骤 613: 源端及对端收到 D2D会话切换命令后， 根据对方的标识建立 起直连的 D2D承载，并通过 D2D承载互相收发 IP数据包，将 EPS承载上的 会话切换到 D2D承载上。
步骤 614 615: 源端向第一 eNB返回会话切换确认响应， 第一 eNB向 MME返回会话切换确认响应。
步骤 616: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载去活请求，释放 EPC承载；可选的，向第一 eNB发送 S1释放接口， 请求释放无线承载。
步骤 617~618： 对端向第二 eNB返回会话切换确认响应， 第二 eNB向 MME返回会话切换确认响应。
步骤 619: MME收到会话切换确认响应后， 可选的， 可向 SGW/PGW 发起承载去活请求，释放 EPC承载；可选的，向第二 eNB发送 S1释放接口， 请求释放无线承载。
步骤 620: EPS承载向 D2D承载的会话切换成功后， 可选的， 第一 eNB 及第二 eNB删除与源端及对端的 RRC连接， 释放无线承载资源。
此外， 本发明实施例中还提供了一种移动通信网络中直连通讯终端会话 切换装置， 应用于 D2D终端， 如图 9所示， 所述装置主要包括：
D2D区域范围检测模块， 用于检测 D2D终端与当前进行会话的 D2D对 端的 D2D区域范围是否发生变化；
会话切换发起模块，用于当 D2D区域范围发生变化时，发起向网络侧的 D2D会话切换请求；
会话切换执行模块， 用于接收来自网络侧的会话切换命令， 并根据所述 会话切换命令进行相应的会话切换操作。
进一步地，所述会话切换发起模块用于，在发起的所述 D2D会话切换请 求中携带本 D2D终端和 D2D对端的终端标识、以及 D2D会话切换请求指示。
进一步地，所述 D2D区域范围检测模块用于，通过检查对方无线信号的 强弱， 判断 D2D区域范围是否发生变化；
其中，所述 D2D区域范围发生变化，包括：与 D2D对端进入或离开 D2D 区域。
此外， 所述装置还可以包括：
通信链路建立模块， 用于与 D2D对端之间建立 D2D承载、 或者与网络 侧建立 EPS承载。
此外， 本发明实施例中还提供了一种移动通信网络中直连通讯终端会话 切换装置， 应用于网络侧， 如图 9所示， 所述装置主要包括：
会话切换处理模块， 用于当获知正在进行会话的 D2D终端与 D2D对端 的 D2D区域范围发生变化时、 或者根据 D2D会话切换请求， 决策发起 D2D 承载与 EPS承载的切换。
进一步地，所述会话切换处理模块用于，通过以下方式获知 D2D终端与 D2D对端的 D2D区域范围是否发生变化：
根据测量报告中的位置信息、或者无线接入侧的 D2D发现机制、或者核 心网侧的 D2D发现机制。
进一步地， 所述会话切换处理模块用于， 决策发起 D2D承载与 EPS承 载的切换后 ,在会话切换消息中携带所述 D2D终端与 D2D对端的终端标识、 及 D2D会话切换指示， 并向所述 D2D终端与 D2D对端发送会话切换命令。
进一步地， 所述装置还可以包括：
通信服务资源分配模块，用于为所述 D2D终端与 D2D对端分配 D2D通 信服务资源， 包括 D2D承载资源或 EPS承载资源。 进一步地， 所述装置还可以包括：
D2D通信服务检查模块， 用于检查所请求的 D2D会话切换是否满足如 下条件之一或其任意组合： 所述 D2D终端与 D2D对端的 D2D区域位置、 D2D能力； 网络侧的 D2D能力； 所述 D2D终端与 D2D对端是否签约 D2D 业务。
进一步地， 所述装置还可以包括：
寻呼模块， 用于当所述 D2D终端与 D2D对端处于空闲状态时， 根据会 话切换请求中的所述 D2D终端与 D2D对端的终端标识，对所述 D2D终端与 D2D对端进行寻呼使其恢复连接态。
以上仅为本发明的优选实施案例而已， 并不用于限制本发明， 本发明还 可有其他多种实施例， 在不背离本发明精神及其实质的情况下， 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形， 但这些相应的改变和 变形都应属于本发明所附的权利要求的保护范围。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 并 且在某些情况下， 可以以不同于此处的顺序执行所示出或描述的步骤， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。
工业实用性 本发明实施例至少具有如下有益效果： 在 D2D通讯中，在网络可控的前 提下实现 D2D会话及会话切换， 使 D2D会话不会因为终端发生移动而断线 或语音不良， 使用户的体验不受终端移动的影响； 同时也有效降低了网络的 数据流量， 使网络资源最优化， 用户也得到更优的通信服务质量、 低的费率 等更好的应用体验。

Claims

权 利 要 求 书
1、 一种移动通信网络中直连通讯终端会话切换方法， 包括：
第一直连通讯 (D2D)终端与第二 D2D终端进行会话过程中，当 D2D区域 范围发生变化时， 网络侧根据 D2D会话切换请求决策发起 D2D承载与演进 分组系统 (EPS)承载的切换。
2、 如权利要求 1所述的方法， 其中， 所述 D2D区域范围发生变化， 包 括：
第一 D2D终端与第二 D2D终端进入或者离开 D2D区域。
3、 如权利要求 2所述的方法， 其中，
第一 D2D终端与第二 D2D终端进入 D2D区域时， 网络侧决策发起 EPS 承载到 D2D承载的切换；
第一 D2D终端与第二 D2D终端离开 D2D区域时，网络侧决策发起 D2D 承载到 EPS承载的切换。
4、 如权利要求 1、 2或 3所述的方法， 其中，
所述第一 D2D终端、或者第二 D2D终端通过检查对方无线信号的强弱， 判断出 D2D区域范围发生变化时， 向网络侧发起所述 D2D会话切换请求； 或者， 网络侧的基站或者移动性管理实体 (MME)根据测量报告中的位置 信息、 或者无线接入侧的 D2D发现机制、 或者核心网侧的 D2D发现机制判 断出 D2D区域范围发生变化时， 发起所述 D2D会话切换请求；
其中，所述 D2D会话切换请求中包含所述第一 D2D终端与所述第二 D2D 终端的终端标识、 D2D会话切换指示。
5、 如权利要求 4所述的方法， 其中， 所述方法还包括：
所述网络侧根据所述 D2D会话切换请求， 对所述第一 D2D终端及所述 第二 D2D终端进行 D2D通信检查后， 决策发起所述 D2D承载与 EPS承载 的切换。
6、 如权利要求 5所述的方法， 其中，
所述 D2D通信检查， 包括以下之一或其任意组合： 所述第一 D2D终端 与所述第二 D2D终端的 D2D区域位置、 D2D能力； 网络侧的 D2D能力； 所述第一 D2D终端与所述第二 D2D终端是否签约 D2D业务。
7、 如权利要求 1、 2或 3所述的方法， 其中， 所述方法还包括： 网络侧决策发起所述 D2D承载与 EPS承载的切换后， 为所述第一 D2D 终端与所述第二 D2D终端分配 D2D 7 载资源或 EPS 7 载资源。
8、 如权利要求 4所述的方法， 其中， 所述方法还包括：
当所述第一 D2D终端或者所述第二 D2D终端处于空闲状态时， 网络侧 根据所述终端标识进行寻呼， 使所述第一 D2D终端或者所述第二 D2D终端 恢复连接态。
9、一种移动通信网络中直连通讯终端会话切换装置，应用于 D2D终端， 所述装置包括：
D2D区域范围检测模块，设置为：检测 D2D终端与当前进行会话的 D2D 对端的 D2D区域范围是否发生变化；
会话切换发起模块， 设置为： 当 D2D区域范围发生变化时， 发起向网络 侧的 D2D会话切换请求；
会话切换执行模块， 设置为： 接收来自网络侧的会话切换命令， 并根据 所述会话切换命令进行相应的会话切换操作。
10、 如权利要求 9所述的装置， 其中，
所述会话切换发起模块设置为：在发起的所述 D2D会话切换请求中携带 本 D2D终端和 D2D对端的终端标识、 以及 D2D会话切换请求指示。
11、 如权利要求 9所述的装置， 其中，
所述 D2D区域范围检测模块设置为： 通过检查对方无线信号的强弱，判 断 D2D区域范围是否发生变化；
其中，所述 D2D区域范围发生变化，包括：与 D2D对端进入或离开 D2D 区域。
12、 如权利要求 9、 10或 11所述的装置， 其中， 所述装置还包括： 通信链路建立模块， 设置为： 与 D2D对端之间建立 D2D承载、 或者与 网络侧建立 EPS承载。
13、 一种移动通信网络中直连通讯终端会话切换装置， 应用于网络侧， 所述装置包括：
会话切换处理模块， 设置为： 当获知正在进行会话的 D2D终端与 D2D 对端的 D2D区域范围发生变化时、 或者根据 D2D会话切换请求， 决策发起 D2D承载与 EPS承载的切换。
14、 如权利要求 13所述的装置， 其中，
所述会话切换处理模块设置为： 通过以下方式获知 D2D终端与 D2D对 端的 D2D区域范围是否发生变化：
根据测量报告中的位置信息、或者无线接入侧的 D2D发现机制、或者核 心网侧的 D2D发现机制。
15、 如权利要求 13所述的装置， 其中，
所述会话切换处理模块设置为： 决策发起 D2D承载与 EPS承载的切换 后， 在会话切换消息中携带所述 D2D终端与 D2D对端的终端标识、 及 D2D 会话切换指示， 并向所述 D2D终端与 D2D对端发送会话切换命令。
16、 如权利要求 13、 14或 15所述的装置， 其中， 所述装置还包括： 通信服务资源分配模块，设置为：为所述 D2D终端与 D2D对端分配 D2D 通信服务资源， 包括 D2D承载资源或 EPS承载资源。
17、 如权利要求 13、 14或 15所述的装置， 其中， 所述装置还包括： D2D通信服务检查模块， 设置为： 检查所请求的 D2D会话切换是否满 足如下条件之一或其任意组合：所述 D2D终端与 D2D对端的 D2D区域位置、 D2D能力； 网络侧的 D2D能力； 所述 D2D终端与 D2D对端是否签约 D2D 业务。
18、 如权利要求 13、 14或 15所述的装置， 其中， 所述装置还包括： 寻呼模块， 设置为： 当所述 D2D终端与 D2D对端处于空闲状态时， 根 据会话切换请求中的所述 D2D终端与 D2D对端的终端标识，对所述 D2D终 端与 D2D对端进行寻呼使其恢复连接态。
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