WO2017035697A1 - 语音承载的建立方法及接入网设备 - Google Patents

语音承载的建立方法及接入网设备 Download PDF

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Publication number
WO2017035697A1
WO2017035697A1 PCT/CN2015/088392 CN2015088392W WO2017035697A1 WO 2017035697 A1 WO2017035697 A1 WO 2017035697A1 CN 2015088392 W CN2015088392 W CN 2015088392W WO 2017035697 A1 WO2017035697 A1 WO 2017035697A1
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WIPO (PCT)
Prior art keywords
network device
access network
voice bearer
terminal
voice
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PCT/CN2015/088392
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English (en)
French (fr)
Inventor
曾美艳
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2018511111A priority Critical patent/JP2018529291A/ja
Priority to CN201580033025.4A priority patent/CN106717057B/zh
Priority to PCT/CN2015/088392 priority patent/WO2017035697A1/zh
Publication of WO2017035697A1 publication Critical patent/WO2017035697A1/zh

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    • 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
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for establishing a voice bearer and an access network device.
  • FIG. 1 is a schematic diagram of an existing voice bearer setup process.
  • the terminal sends a service request to the core network device to initiate a voice service (S101).
  • the core network device sends a bearer setup request to the first access network device according to the service request (S102).
  • the first access network device is requested to establish a voice bearer for it.
  • the first access network device cannot establish a voice bearer for the terminal due to coverage or legal restrictions, etc., it sends a response message to the core network device (S103) to notify the core network device that the bearer establishment fails.
  • the first access network device switches the terminal to the neighboring cell (S104), and notifies the core network device (S105).
  • the core network device sends a bearer setup request to the second access network device where the neighboring cell is located (S106), and the second access network device where the neighboring cell is located establishes a voice bearer (S107), and sends the voice bearer to the core network.
  • the device sends a response message (S108) to inform the core network device that the bearer establishment is successful. It can be seen that when the cell in which the terminal resides cannot establish a voice bearer, a large voice call delay will occur, and the user experience is not good.
  • the technical problem to be solved by the embodiments of the present invention is to provide a method for establishing a voice bearer and an access network device. In order to solve the problem that the voice call delay is large when the current camping cell of the terminal cannot establish a voice bearer.
  • an embodiment of the present invention provides a method for establishing a voice bearer, which is used for establishing a voice bearer of a terminal, where the terminal resides in a cell provided by a first access network device, and the first access
  • the network device is not suitable for establishing a voice bearer, and the method includes:
  • the bearer setup request message is used to request the first access network device to establish a voice bearer
  • the first access network device sends a bearer setup response message to the core network device, where the bearer setup response message is used to notify the core network device that the voice bearer is successfully established;
  • the first access network device switches the terminal to the target cell, and triggers establishment of the voice bearer in the target cell during the handover process.
  • the method before the first access network device switches the terminal to the target cell, the method further includes:
  • the target cell is selected from neighboring cells according to the acquired state information.
  • the state information includes a voice service processing capability.
  • the status information further includes one or both of signal quality and load.
  • the cell that the terminal resides in is a time division duplex TDD cell
  • the target cell is a frequency division duplex FDD cell.
  • the first access network device when the target cell belongs to the second access network device, the first access network device triggers the establishment of the voice bearer in the target cell during the handover process, including:
  • the first access network device sends the voice bearer setup indication information to the second access network device, where the voice bearer setup indication information is used to indicate that the second access network device establishes a voice bearer.
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message. Or X2 switch request message.
  • the target cell belongs to the first access network device
  • the first access network device triggers the establishment of the voice bearer in the target cell during the handover process, and further includes:
  • the embodiment of the present invention provides a method for establishing a voice bearer, which is used for establishing a voice bearer of a terminal, where the terminal resides in a cell provided by a first access network device, and the first access
  • the network device is not suitable for establishing a voice bearer, and the method includes:
  • the second access network device receives the voice bearer setup indication information sent by the first access network device, where the voice bearer setup indication information is received by the first access network device by the voice bearer setup request sent by the core network device. And sent to the second access network device;
  • the second access network device establishes a voice bearer for the terminal according to the voice bearer setup indication information
  • the second access network device sends a voice bearer setup response to the first access network device to notify the first access network device that the voice bearer setup is complete.
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message or an X2 handover request message;
  • the voice bearer setup response is a handover request acknowledgement message.
  • an embodiment of the present invention provides an access network device, which is used to establish a voice bearer of a terminal, where the terminal resides in a cell provided by the access network device, and the access network device is uncomfortable.
  • the voice network bearer is established, and the access network device includes:
  • a receiving unit configured to receive a bearer setup request message sent by the core network device, where the bearer setup request message is used to request the access network device to establish a voice bearer;
  • a sending unit configured to send a bearer setup response message to the core network device, where the bearer setup response message is used to notify the core network device that the voice bearer is successfully established;
  • a switching unit configured to switch the terminal to the target cell, and trigger establishment of the voice bearer in the target cell during the handover process.
  • the access network device further includes:
  • An acquiring unit configured to acquire state information of a neighboring cell of the cell where the terminal resides
  • a selecting unit configured to select from neighboring cells according to the state information acquired by the acquiring unit The target cell.
  • the state information includes a voice service processing capability.
  • the status information further includes one or all of a signal quality and a load.
  • the cell in which the terminal resides is a time division duplex TDD cell
  • the target cell is a frequency division duplex FDD cell.
  • the switching unit when the target cell belongs to the second access network device, the switching unit is specifically configured to:
  • the voice bearer setup indication information is sent to the second access network device, where the voice bearer setup indication information is used to indicate that the second access network device establishes a voice bearer.
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message. Or X2 switch request message.
  • the switching unit when the target cell belongs to the access network device, the switching unit is specifically configured to:
  • an embodiment of the present invention provides an access network device, which is used to establish a voice bearer of a terminal, where the terminal resides in a cell provided by the access network device, and the access network device is uncomfortable.
  • the voice network bearer is established, and the access network device includes:
  • a processor a first interface circuit, a second interface circuit, a memory, a bus, and a transceiver, wherein the processor, the first interface circuit, the second interface circuit, the transceiver, and the memory are connected by the bus and complete communication with each other
  • the memory stores a set of program codes
  • the processor is configured to invoke program code stored in the memory to perform the following operations:
  • the terminal is handed over to the target cell, and the establishment of the voice bearer in the target cell is triggered during the handover process.
  • the processor is further configured to:
  • the target cell is selected from neighboring cells according to the acquired state information.
  • the state information includes a voice service processing capability.
  • the status information further includes one or all of a signal quality and a load.
  • the cell that the terminal resides in is a time division duplex TDD cell
  • the target cell is a frequency division duplex FDD cell.
  • the processor when the target cell belongs to the second access network device, the processor is specifically configured to:
  • the voice bearer setup indication information is sent to the second access network device by using the second interface circuit, where the voice bearer setup indication information is used to indicate that the second access network device establishes a voice bearer.
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message. Or X2 switch request message.
  • the processor when the target cell belongs to the first access network device
  • the processor is specifically configured to:
  • a voice bearer is set up for the terminal in the target cell, and a handover command message is sent to the terminal by the transceiver, where the handover command message carries a voice bearer established for the terminal.
  • an embodiment of the present invention provides an access network device, where the terminal is used for establishing a voice bearer, where the terminal resides in a cell provided by a first access network device, and the first access network
  • the device is not suitable for establishing a voice bearer, and the access network device includes:
  • a receiving unit configured to receive the voice bearer setup indication information sent by the first access network device, where the voice bearer setup indication information is received by the first access network device after receiving the voice bearer setup request sent by the core network device Sent to the access network device;
  • An establishing unit configured to establish, according to the voice bearer setup indication information, a voice bearer for the terminal;
  • a sending unit configured to send a voice bearer setup response to the first access network device, to notify the first access network device that voice bearer establishment is completed.
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message or an X2 handover request.
  • the message; the voice bearer setup response is a handover request acknowledgement message.
  • an embodiment of the present invention provides an access network device, where the terminal is used for establishing a voice bearer, where the terminal resides in a cell provided by a first access network device, and the first access network
  • the device is not suitable for establishing a voice bearer, and the access network device includes:
  • a processor an interface circuit, a memory, and a bus
  • the processor, the interface circuit, and the memory are connected by the bus and complete communication with each other
  • the memory stores a set of program codes
  • the processor is used to call the The program code stored in the memory, do the following:
  • the interface circuit Receiving, by the interface circuit, the voice bearer setup indication information sent by the first access network device, where the voice bearer setup indication information is sent by the first access network device after receiving the voice bearer setup request sent by the core network device Sent by the access network device;
  • the voice bearer setup indication information is carried in a handover request message, and the handover request message is an S1 handover request message or an X2 handover request.
  • the message; the voice bearer setup response is a handover request acknowledgement message.
  • the first access network device receives the bearer setup request sent by the core network device. Sending a bearer setup response message to the core network device to notify the core network device of the voice bearer establishment layer, and then triggering the establishment of the voice bearer in the target cell during the handover process when the terminal is handed over to the target cell, so that
  • an access network device is not suitable for establishing a voice bearer, although it does not establish a voice bearer, it still sends a response message to the core network device that the bearer is successfully established, so that the core network device does not consider the bearer establishment failure but waits for the handover.
  • the terminal After the success, the terminal sends a bearer setup request message to the newly cut-in cell, so that the continuation of the communication after the voice resource is prepared in the target cell is ensured, so that the terminal can directly use the resource prepared in advance after the cell handover.
  • Establish a voice bearer complete the processing of the voice call service, reduce the delay of the voice call, and reduce the waiting time of the user.
  • FIG. 1 is a schematic diagram of a conventional voice bearer establishment process
  • FIG. 2 is a schematic flowchart of a method for establishing a voice bearer according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart diagram of another method for establishing a voice bearer according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart of a method for establishing a voice bearer in an X2 handover process according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart of a method for establishing a voice bearer in an S1 handover process according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flowchart of a method for establishing a voice bearer in an intra-station handover process according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of an access network device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another access network device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of still another access network device according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of still another access network device according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of still another access network device according to an embodiment of the present invention.
  • the problem that the access delay caused by the terminal camping cell cannot establish a voice bearer is large, and when the voice bearer cannot be established on the access network device, although the voice bearer is not established, The bearer of the core network device is notified to be successfully established, and the voice bearer is established in the handover process, so that the target access network device prepares the voice resource in advance, reduces the access delay, and improves the user experience.
  • the access network is used to connect the terminal to the wireless network, and the access network device includes but is not limited to: an evolved Node B (eNB), a radio network controller (RNC), and a node.
  • B Node B, NB
  • BSC Base Station Controller
  • BTS Base Transceiver Station
  • HNB baseband unit
  • BBU Wifi Access Point
  • the core network is used to provide management and connection to the external network for the terminal.
  • Core network equipment includes, but is not limited to, Mobility Management Entity (MME), General Packet Radio System (GPRS) service support node (SGSN), and mobile switching center (Mobile Switching Center). , MSC) and so on.
  • MME Mobility Management Entity
  • GPRS General Packet Radio System
  • SGSN General Packet Radio System
  • SGSN General Packet Radio System
  • MSC Mobile Switching Center
  • Terminal also known as User Equipment (UE)
  • UE User Equipment
  • UE is a device that provides voice and/or data connectivity to users, for example, a handheld device with wireless connectivity, and a connection to a wireless modem solution.
  • FIG. 2 is a schematic flowchart of a method for establishing a voice bearer according to an embodiment of the present invention.
  • the method is used for establishing a voice bearer of a terminal, and the terminal camps on a cell provided by the first access network device (hereinafter referred to as a camping cell), and the first access network device is not suitable for establishing a voice bearer.
  • the method includes the following steps:
  • the first access network device receives a bearer setup request message sent by the core network device, where the bearer setup request message is used to request the first access network device to establish a voice bearer.
  • the first access network device sends a bearer setup response message to the core network device, where the bearer setup response message is used to notify the core network device that the voice bearer is successfully established.
  • S203 The first access network device switches the terminal to the target cell, and triggers establishment of the voice bearer in the target cell during the handover process.
  • the first access network device is not suitable for establishing a voice bearer, but still returns a message that the voice bearer is successfully established to the core network device, and triggers the establishment of the voice bearer in the neighboring cell in the subsequent handover process. Therefore, the voice resource is prepared in advance in the handover process, and the voice bearer is not required to be established after the handover is completed, thereby reducing the voice access delay and improving the user experience.
  • the first access network device is not suitable for establishing a voice bearer, and one or all of the scenarios in which the voice bearer and the voice service service quality are not suitable for voice communication cannot be established. Poor voice service quality can be judged by setting the voice service quality threshold. This application does not impose any restrictions.
  • the bearer setup request message may carry the voice bearer setup indication information, where the voice bearer setup indication information is used to indicate that the bearer to be established is a voice bearer.
  • the voice bearer setup indication information may use a Quality of Service Class Identifier (QCI).
  • QCI is used to describe the characteristics of data transmission between the terminal and the Policy and Charging Enforcement Function (PCEF). It mainly includes four types of information: Resource Type, Priority, and Priority. Packet Delay Budget, Packet Error Loss Rate.
  • QCI is a scale value, and each service requires different levels of QCI to ensure transmission quality.
  • DRB Data Radio Bearer
  • QCI1, QCI2, and QCI5 are all voice-related QCIs.
  • the QCI1 carries the voice service
  • the QCI2 carries the video service
  • the QCI5 carries the session initiation protocol (English: Session Initiation Protocol, SIP) signaling, for example, the SIP signaling used to establish and release the voice service.
  • SIP Session Initiation Protocol
  • the voice service is established, it is completed by sending SIP signaling to the core network device in the QCI5, triggering the core network to establish the QCI1 bearer, or completing the QCI1 and QCI2 bearers for the videophone.
  • the voice service is terminated, the corresponding SIP signaling is transmitted on the QCI5 to trigger the core network device to release the QCI1, or for the videophone industry. It is necessary to release QCI1 and QCI2 to complete and think that the call is over.
  • the QCI1 can be used to indicate that the bearer to be established is a voice bearer, that is, the QCI1 can be used as the voice bearer setup indication information.
  • the QCI1 and QCI2 can be utilized as voice bearer setup indication information.
  • a message may be defined to indicate that the bearer to be established is a voice bearer, and the application does not impose any limitation on this.
  • step S202 since the first access network device is not suitable for establishing a voice bearer, it does not establish a voice bearer, but it still sends a response message that the bearer setup is successful to the core network device. Therefore, the core network device does not consider that the bearer establishment fails, and waits for the handover to succeed, and then sends a bearer setup request message to the newly cut-in cell of the terminal. It ensures the continued communication after the voice resources are prepared in the target cell in the subsequent handover process.
  • the first access network device may select the target cell to be handed over.
  • FIG. 3 is a schematic flowchart diagram of another method for establishing a voice bearer according to an embodiment of the present invention.
  • the steps S301-S302 are the same as the steps S201-S202, and are not described here again.
  • the method further includes:
  • the first access network device acquires state information of a neighboring cell of the camping cell.
  • S304 Select a target cell from the neighboring cells according to the acquired state information.
  • the foregoing status information may include a language service processing capability, and the first access network device selects, according to the status information, a cell having voice service processing capability from a neighboring cell of the camping cell as the target cell.
  • the status information of the neighboring cell indicates that the neighboring cell is suitable for establishing a voice bearer
  • the neighboring cell is used as the target cell.
  • the neighboring cell suitable for establishing a voice bearer is used as a target cell; if more than one neighboring cell is suitable for establishing a voice bearer, then any one of the neighboring cells is suitable for establishing a voice bearer.
  • One is used as the target cell, or one best cell is selected as the target cell according to other state information.
  • a Time Division Duplex (TDD) cell is not suitable for establishing a voice bearer
  • a Frequency Division Duplex (FDD) cell is suitable for establishing a voice bearer. Therefore, when the camped cell is a TDD cell, An FDD cell is selected as a target cell from its neighboring cells, and the terminal is switched over, and the establishment of the voice bearer in the target cell is triggered during the handover process.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • the basis for selecting the target cell from the neighboring cells suitable for establishing the voice bearer may include the signal quality of the neighboring cell, and may also include the load of the neighboring cell. For example, choose the best signal quality
  • the neighboring cell is the most targeted cell, or the neighboring cell with the lowest load is selected as the target cell.
  • it is merely an example and is not intended to limit the application.
  • the signal quality can be measured and reported by the terminal, and the load of the neighboring cell can be obtained through the interaction between the base stations.
  • the neighboring cell and the camping cell belong to the same access network device, no inter-base station interaction is required.
  • the above handover process refers to inter-station handover, including S1 handover and X2 handover.
  • inter-station handover including S1 handover and X2 handover.
  • LTE Long Term Evolution
  • eNBs access network devices
  • S1 switching is performed.
  • the inter-station handover is usually an S1 handover.
  • the switching between different systems, that is, the source access network device and the target access network device belong to different network standards, and the inter-station handover is usually S1 handover.
  • the above handover procedure refers to intra-station handover.
  • LTE Long Term Evolution
  • FIG. 4 is a schematic flowchart of a method for establishing a voice bearer in an X2 handover process according to an embodiment of the present invention.
  • the first access network device is the eNB1
  • the second access network device is the eNB2
  • the core network device is the mobility management entity MME.
  • the neighboring cell selected by eNB1 is located at eNB2, and the terminal is handed over from eNB1 to eNB2 by X2 handover.
  • the method includes the following steps:
  • S401 The terminal sends a service request to the MME to initiate a voice call.
  • the MME sends a bearer setup request message to the eNB1, where the bearer setup request message is used to request the eNB1 to establish a voice bearer.
  • S403 The eNB1 returns a bearer setup response message, and notifies the MME that the voice bearer is successfully established.
  • S404 The eNB1 selects a neighboring cell of the current camping cell, and initiates an X2 handover procedure, where the neighboring cell is located at the eNB2.
  • the eNB1 sends a handover request message to the eNB2, and carries the voice bearer setup indication information, where the voice bearer setup indication information is used to indicate that the eNB2 establishes a voice bearer.
  • the eNB2 can prepare the resources of the voice bearer in advance according to the handover request message.
  • the preparation in advance refers to resource preparation for voice bearer before the terminal switches the cell.
  • S406 eNB2 performs resource admission, and allocates air interface resources and voice bearer resources for access of the terminal.
  • the eNB1 instructs the terminal to perform handover.
  • the RRC connection reconfiguration message may be sent to the terminal to instruct the terminal to perform handover.
  • the terminal After the terminal successfully accesses the target cell, the terminal informs the eNB2 that the handover process is complete. For example, the terminal sends an RRC connection reconfiguration complete message to the second base station, and confirms that the handover process is completed to the second base station.
  • S410 The eNB2 sends a request message to the MME requesting to update the node address of the service data channel.
  • the MME After updating the data channel node address, the MME sends an acknowledgement message to the eNB2, indicating that the service communication can be performed on the new bearer.
  • S412 The terminal has accessed the target cell, and can perform service communication in the target cell. At this time, the eNB2 instructs the eNB1 to release the resource and the context of the terminal.
  • the eNB2 After the eNB2 prepares the voice bearer resources for the X2 handover in advance, the eNB can perform the cell handover according to the handover procedure defined by the TS36.300 protocol, quickly establish the voice bearer by using the prepared resources, and process the voice call service, thereby reducing the delay of the voice call. .
  • FIG. 5 is a schematic flowchart of a method for establishing a voice bearer in an S1 handover process according to an embodiment of the present invention.
  • the first access network device is the eNB1
  • the second access network device is the eNB2
  • the core network device is the MME.
  • the neighboring cell selected by eNB1 is located at eNB2, and the terminal is handed over from eNB1 to eNB2 by S1 handover.
  • the method includes the following steps:
  • Steps S501-S503 are the same as steps S401-S403, and refer to S401-S403, and details are not described herein again.
  • S504 The eNB1 selects a neighboring cell of the current camping cell, and initiates an S1 handover procedure.
  • eNB1 sends a handover request message to the MME, and carries a voice bearer setup indication message, where the voice bearer setup indication information is used to indicate that the eNB2 establishes a voice bearer.
  • the mobility management entity can notify the eNB2 to prepare the resources of the voice bearer in advance.
  • S506 The MME sends a handover request message to the eNB2.
  • S507 eNB2 performs resource admission, and allocates air interface resources and voice bearer resources for access of the terminal.
  • the MME sends a handover indication to the eNB1, and informs the eNB2 of the address and other information.
  • the eNB1 instructs the terminal to perform handover.
  • the RRC connection reconfiguration message may be sent to the terminal to instruct the terminal to perform handover.
  • the terminal After the terminal successfully accesses the target cell, the terminal informs the eNB2 that the handover process is complete. For example, the terminal sends an RRC connection reconfiguration complete message to the eNB2, and confirms that the handover process is completed to the eNB2.
  • S512 The terminal has accessed the target cell, and can perform service communication in the target cell. At this time, the eNB2 instructs the eNB1 to release the resource and the context of the terminal.
  • the voice bearer can be quickly established and the voice call service can be quickly used after the cell handover, and the delay of the voice call can be reduced.
  • FIG. 6 is a schematic flowchart of a method for establishing a voice bearer in an intra-station handover process according to an embodiment of the present invention.
  • the first access network device is used as the eNB1
  • the core network device is the MME.
  • the neighboring cell selected by eNB1 is located in the station. Therefore, there is no need to perform handover between base stations.
  • the method includes the following steps:
  • Steps S601-S603 are the same as steps S401-S403, and refer to S401-S403, and details are not described herein again.
  • S604 eNB1 selects a neighboring cell of the current camping cell, initiates an intra-station handover process, and prepares a resource for voice bearer in advance for the terminal.
  • the intra-station handover is mainly implemented by the RRC reconfiguration, that is, the RRC reconfiguration message is sent to the terminal, and the selected neighboring cell is configured as the serving cell by the reconfiguration message.
  • the RRC reconfiguration message may be referred to as a handover command message for intra-station handover. That includes the following steps:
  • the eNB1 sends a handover command message to the terminal, and carries the voice bearer established for the terminal.
  • the eNB1 can notify the terminal of the voice bearer resource established by the terminal, and then quickly use the prepared resource to establish a voice bearer and process the voice call service after the cell handover is completed. , reducing the delay of voice calls.
  • FIG. 7 is a schematic diagram of a composition of an access network device according to an embodiment of the present invention.
  • the access network device is used to establish a voice bearer of a terminal, where the terminal resides in the access network device. And the access network device is not suitable for establishing a voice bearer.
  • the access network device includes:
  • the receiving unit 100 is configured to receive a bearer setup request message sent by the core network device, where the bearer setup request message is used to request the access network device to establish a voice bearer.
  • the sending unit 200 is configured to send a bearer setup response message to the core network device, where the bearer setup response message is used to notify the core network device that the voice bearer is successfully established.
  • the switching unit 300 is configured to switch the terminal to the target cell, and trigger the establishment of the voice bearer in the target cell during the handover process.
  • the cell in which the terminal resides is a time division duplex TDD cell
  • the target cell is a frequency division duplex FDD cell.
  • the switching unit 300 is specifically configured to:
  • the voice bearer setup indication information is sent to the second access network device, where the voice bearer setup indication information is used to indicate that the second access network device establishes a voice bearer.
  • the voice bearer setup indication information is carried in the handover request message, and the handover request message is an S1 handover request message or an X2 handover request message.
  • the switching unit 300 is specifically configured to:
  • the access network devices include, but are not limited to, an evolved Node B, a radio network controller, a Node B, a base station controller, a base transceiver station, a home base station, a baseband unit, a Wifi access point, and the like.
  • the receiving unit and the sending unit in this embodiment may be an access network device interface circuit, and the interface circuit is used to implement communication with the core network device, for example, may be an S1 interface circuit, and is used to implement the S1 interface protocol.
  • the interface circuit can be connected to the processor of the access network device, and the processor generates a bearer setup response message according to the received bearer setup request message, and sends the bearer setup response message to the core network device.
  • the switching unit may be a separately set processor, or may be integrated in one processor of the access network device, or may be stored in the memory of the access network device in the form of program code, by the access network device.
  • One of the processors calls and executes the functions of the above switching unit.
  • the processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement embodiments of the present invention. Circuit.
  • FIG. 8 is a schematic diagram of another access network device according to an embodiment of the present invention. Compared with the access network device shown in FIG. 7, the access network device in the embodiment of the present invention further includes:
  • the obtaining unit 400 is configured to acquire state information of a neighboring cell of the cell where the terminal resides;
  • the selecting unit 500 is configured to select the target cell from the neighboring cells according to the state information acquired by the acquiring unit 400.
  • the status information includes voice service processing capabilities.
  • the status information further includes one or both of signal quality and load.
  • the acquisition unit and the selection unit are implemented as the switching unit, and may be integrated with the switching unit or independently.
  • the acquiring unit can obtain status information by interacting with the terminal of the access network device to obtain status information, and can also obtain status information by interacting with other access network devices through interface circuits of other access network devices.
  • the processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more sets configured to implement embodiments of the present invention. Into a circuit.
  • FIG. 9 is a schematic diagram of a composition of an access network device according to an embodiment of the present invention.
  • the access network device is used to establish a voice bearer of a terminal, where the terminal resides in the access network device.
  • the provided network, and the access network device is not suitable for establishing a voice bearer.
  • the access network device includes:
  • the bus 1105 is connected to and completes communication with each other, wherein the memory 1104 stores a set of program codes, and the processor 1101 is configured to call the program code stored in the memory 1104 to perform the following operations:
  • the terminal is handed over to the target cell, and the establishment of the voice bearer in the target cell is triggered during the handover process.
  • processor 1101 is further configured to:
  • the target cell is selected from neighboring cells according to the acquired state information.
  • the processor 1101 may obtain status information from the terminal through the transceiver 1106, or obtain status information through the access network device and the second interface circuit 1103 of the other access network device.
  • the status information includes voice service processing capabilities.
  • the status information further includes one or both of signal quality and load.
  • the cell in which the terminal resides is a time division duplex TDD cell, and the target cell is a frequency division duplex FDD cell.
  • the processor 1101 is specifically configured to:
  • the voice bearer setup indication information is sent to the second access network device by using the second interface circuit 1103, where the voice bearer setup indication information is used to indicate that the second access network device establishes a voice bearer.
  • the voice bearer setup indication information is carried in the handover request message, and the handover is requested.
  • the message is an S1 handover request message or an X2 handover request message.
  • the processor 1101 is specifically configured to:
  • a voice bearer is set up for the terminal in the target cell, and a handover command message is sent to the terminal by the transceiver 1106, where the handover command message carries a voice bearer established for the terminal.
  • the processor 1101 herein may be a processor or a collective name of multiple processing elements.
  • the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • DSP digital signal processor
  • FPGA Field Programmable Gate Array
  • the memory 1103 may be a storage device or a collective name of a plurality of storage elements, and is used to store executable program code or parameters, data, and the like required for operation of the access network device. And the memory 1103 may include random access memory (RAM), and may also include non-volatile memory such as a magnetic disk memory, a flash memory, or the like.
  • RAM random access memory
  • non-volatile memory such as a magnetic disk memory, a flash memory, or the like.
  • the bus 1104 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus 1104 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus.
  • FIG. 10 is a schematic diagram of a composition of an access network device according to an embodiment of the present invention.
  • the access network device is used to establish a voice bearer of a terminal, where the terminal resides in a first access network device.
  • the receiving unit 600 is configured to receive the voice bearer setup indication information sent by the first access network device, where the voice bearer setup indication information is received by the first access network device by the voice bearer setup request sent by the core network device. And sent to the access network device;
  • the establishing unit 700 is configured to establish a voice bearer for the terminal according to the voice bearer setup indication information.
  • the sending unit 800 is configured to send a voice bearer setup response to the first access network device to notify the first access network device that voice bearer establishment is complete.
  • the voice bearer setup indication information is carried in the handover request message, and the handover request message is an S1 handover request message or an X2 handover request message; and the voice bearer setup response is a handover request acknowledgement message.
  • the access network devices include, but are not limited to, an evolved Node B, a radio network controller, a Node B, a base station controller, a base transceiver station, a home base station, a baseband unit, a Wifi access point, and the like.
  • the receiving unit and the sending unit in this embodiment may be interface circuits of the access network device, such as an X2 interface circuit or an S1 interface circuit, and the interface circuit is configured to implement communication with other access network devices to access other access networks.
  • the device receives the voice bearer setup indication information, and sends the voice bearer setup response to the other access network device; or the interface circuit is configured to implement communication with the core network device to receive the voice of the other access network device forwarded by the core network device.
  • the establishing unit may be a separately set processor, or may be implemented in one processor of the access network device, or may be stored in the memory of the access network device in the form of program code, and the access network device One of the processors calls and executes the functions of the above established unit.
  • the processor described herein may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated systems configured to implement embodiments of the present invention. Circuit.
  • FIG. 11 is a schematic diagram of a composition of an access network device according to an embodiment of the present invention.
  • the access network device is used to establish a terminal voice bearer, where the terminal resides in a first access network device.
  • the processor 2101, the interface circuit 2102, the memory 2103, and the bus 2104, the processor 2101, the interface circuit 2102, and the memory 2103 are connected through the bus 2104 and complete communication with each other, wherein the memory 2103 stores a set of programs.
  • the processor 2101 is configured to invoke the program code stored in the memory 2103, and perform the following operations:
  • the interface circuit 2102 Receiving, by the interface circuit 2102, the voice bearer setup indication information sent by the first access network device, where the voice bearer setup indication information is sent by the first access network device after receiving the voice bearer setup request sent by the core network device Transmitted by the access network device;
  • the voice bearer setup response is sent to the first access network device by the interface circuit 2102 to notify the first access network device that the voice bearer setup is completed.
  • the interface circuit 2102 may be an interface circuit that interacts with other access network devices, such as an X2 interface circuit, to receive voice bearer setup indication information from other access network devices, and send a voice bearer setup response to other access network devices. Or an interface circuit that interacts with the core network device, such as an S1 interface circuit, to receive voice bearer setup indication information of other access network devices forwarded by the core network device, and forward the voice bearer setup response to the core device through the core network device. Access network equipment.
  • the voice bearer setup indication information is carried in the handover request message, and the handover request message is an S1 handover request message or an X2 handover request message; and the voice bearer setup response is a handover request acknowledgement message.
  • the processor 2101 herein may be a processor or a collective name of multiple processing elements.
  • the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • DSPs digital signal processors
  • FPGAs Field Programmable Gate Arrays
  • the memory 2103 may be a storage device or a collective name of a plurality of storage elements, and is used to store executable program code or parameters, data, and the like required for the operation of the access network management device. And the memory 2103 may include a random access memory (RAM), and may also include a non-volatile memory such as a disk memory, a flash memory, or the like.
  • RAM random access memory
  • the bus 2104 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus 1104 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.
  • the present invention has the following advantages:
  • the first access network device When receiving the bearer setup request message sent by the core network device, the first access network device sends a bearer setup response message to the core network device, notifies the core network device of the voice bearer setup layer, and then, when the terminal is handed over to the target cell, During the handover process, the voice bearer is triggered to be established in the target cell, so that when the first access network device is not suitable for establishing a voice bearer, although the voice bearer is not established, the bearer is successfully sent to the core network device.
  • the message is such that the core network device does not consider the bearer establishment failure, and waits for the handover to succeed, and then sends a bearer setup request message to the newly cut-in cell of the terminal, so as to continue the communication after the voice resource is prepared in the target cell in the subsequent handover process.
  • the terminal can directly use the resources prepared in advance to establish a voice bearer, complete the processing of the voice call service, reduce the delay of the voice call, and reduce the waiting time of the user.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例公开了一种语音承载的建立方法及接入网设备，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述方法包括：所述第一接入网设备接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述第一接入网设备建立语音承载；所述第一接入网设备向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；所述第一接入网设备将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。采用本发明，可在终端进行小区切换时降低语音呼叫时延。

Description

语音承载的建立方法及接入网设备 技术领域
本发明涉及通信技术领域，尤其涉及一种语音承载的建立方法及接入网设备。
背景技术
随着通信技术的不断发展，数据传输越来越快。最基础且非常重要的语音呼叫也从最初的纯语音发展到音视频通话。现有的语音呼叫接通等待时间更短，且能为用户提供更高质量、更自然的音视频通话，方便了用户的之间的沟通。
请参考图1，其为一种现有的语音承载建立过程的示意图。如图1所示，终端向核心网设备发送业务请求(service request)以发起语音业务(S101)；核心网设备基于该业务请求，向第一接入网设备发送承载建立请求(S102)，以请求第一接入网设备为其建立语音承载。当第一接入网设备因为覆盖或法律限制等原因无法为该终端建立语音承载时，其向核心网设备发送响应消息(S103)，以告知核心网设备承载建立失败。而后，第一接入网设备将终端切换到相邻小区(S104)，并通知核心网设备(S105)。如此，核心网设备向相邻小区所在的第二接入网设备发送承载建立请求(S106)，并由该相邻小区所在的第二接入网设备建立语音承载(S107)，并向核心网设备发送响应消息(S108)，以告知核心网设备承载建立成功。可见，当终端驻留的小区无法建立语音承载时，将产生较大的语音呼叫时延，用户体验不佳。
发明内容
本发明实施例所要解决的技术问题在于，提供一种语音承载的建立方法及接入网设备。以解决终端当前驻留小区无法建立语音承载时，语音呼叫时延较大的问题。
第一方面，本发明实施例提供了一种语音承载的建立方法，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述方法包括：
所述第一接入网设备接收核心网设备发送的承载建立请求消息，其中，所 述承载建立请求消息用于请求所述第一接入网设备建立语音承载；
所述第一接入网设备向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
所述第一接入网设备将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
结合第一方面，在第一方面第一种可能的实现方式中，所述第一接入网设备将所述终端切换到目标小区之前，还包括：
所述第一接入网设备获取所述终端所驻留的所述小区的相邻小区的状态信息；
根据所获取的状态信息，从相邻小区中选择所述目标小区。
结合第一方面第一种可能的实现方式，在第一方面第二种可能的实现方式中，所述状态信息包括语音业务处理能力。
结合第一方面第二种可能的实现方式，在第一方面第三种可能的实现方式中，所述状态信息还包括信号质量和负载之一或全部。
结合第一方面、或第一方面第一种至第三种任一可能的实现方式，在第一方面第四种可能的实现方式中，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
结合第一方面、或第一方面第一种至第四种任一可能的实现方式，在第一方面第五种可能的实现方式中，当所述目标小区属于第二接入网设备时，所述第一接入网设备在切换过程中触发语音承载在所述目标小区的建立，包括：
所述第一接入网设备向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
结合第一方面第五种可能的实现方式，在第一方面第六种可能的实现方式中，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
结合第一方面、或第一方面第一种至第四种任一可能的实现方式，在第一方面第七种可能的实现方式中，当所述目标小区属于所述第一接入网设备时，所述第一接入网设备在切换过程中触发语音承载在所述目标小区的建立，还包括：
在所述目标小区为所述终端建立语音承载；
向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
第二方面，本发明实施例提供了一种语音承载的建立方法，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述方法包括：
第二接入网设备接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述第二接入网设备发送的；
所述第二接入网设备根据所述语音承载建立指示信息，为所述终端建立语音承载；
所述第二接入网设备向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
结合第二方面，在第二方面第一种可能的实现方式中，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
第三方面，本发明实施例提供了一种接入网设备，用于终端语音承载的建立，所述终端驻留在所述接入网设备所提供的小区，且所述接入网设备不适于建立语音承载，所述接入网设备包括：
接收单元，用于接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述接入网设备建立语音承载；
发送单元，用于向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
切换单元，用于将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
结合第三方面，在第三方面第一种可能的实现方式中，所述接入网设备还包括：
获取单元，用于获取所述终端所驻留的所述小区的相邻小区的状态信息；
选择单元，用于根据所述获取单元所获取的状态信息，从相邻小区中选择 所述目标小区。
结合第三方面第一种可能的实现方式，在第三方面第二种可能的实现方式中，所述状态信息包括语音业务处理能力。
结合第三方面第二种可能的实现方式，在第三方面第三种可能的实现方式中，所述状态信息还包括信号质量和负载之一或全部。
结合第三方面、或第三方面第一种至第三种任一可能的实现方式，在第三方面第四种可能的实现方式中，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
结合第三方面、或第三方面第一种至第四种任一可能的实现方式，在第三方面第五种可能的实现方式中，当所述目标小区属于第二接入网设备时，所述切换单元具体用于：
向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
结合第三方面第五种可能的实现方式，在第三方面第六种可能的实现方式中，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
结合第三方面、或第三方面第一种至第四种任一可能的实现方式，在第三方面第七种可能的实现方式中，当所述目标小区属于所述接入网设备时，所述切换单元具体用于：
在所述目标小区为所述终端建立语音承载；向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
第四方面，本发明实施例提供了一种接入网设备，用于终端语音承载的建立，所述终端驻留在所述接入网设备所提供的小区，且所述接入网设备不适于建立语音承载，所述接入网设备包括：
处理器、第一接口电路、第二接口电路、存储器、总线和收发机，所述处理器、第一接口电路、第二接口电路、收发机和存储器通过所述总线连接并完成相互间的通信，其中，所述存储器中存储一组程序代码，所述处理器用于调用所述存储器中存储的程序代码，执行以下操作：
通过第一接口电路接收核心网设备发送的承载建立请求消息，其中，所述 承载建立请求消息用于请求所述接入网设备建立语音承载；
通过第一接口电路向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
结合第四方面，在第四方面第一种可能的实现方式中，所述处理器还用于：
通过收发机或第二接口电路获取所述终端所驻留的所述小区的相邻小区的状态信息；
根据所获取的状态信息，从相邻小区中选择所述目标小区。
结合第四方面第一种可能的实现方式，在第四方面第二种可能的实现方式中，所述状态信息包括语音业务处理能力。
结合第四方面第二种可能的实现方式，在第四方面第三种可能的实现方式中，所述状态信息还包括信号质量和负载之一或全部。
结合第四方面、或第四方面第一种至第三种任一可能的实现方式，在第四方面第四种可能的实现方式中，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
结合第四方面、或第四方面第一种至第四种任一可能的实现方式，在第四方面第五种可能的实现方式中，当所述目标小区属于第二接入网设备时，所述处理器具体用于：
通过第二接口电路向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
结合第四方面第五种可能的实现方式，在第四方面第六种可能的实现方式中，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
结合第四方面、或第四方面第一种至第四种任一可能的实现方式，在第四方面第七种可能的实现方式中，当所述目标小区属于所述第一接入网设备时，所述处理器具体用于：
在所述目标小区为所述终端建立语音承载；通过收发机向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
第五方面，本发明实施例提供了一种接入网设备，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述接入网设备包括：
接收单元，用于接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述接入网设备发送的；
建立单元，用于根据所述语音承载建立指示信息，为所述终端建立语音承载；
发送单元，用于向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
结合第五方面的实现方式，在第五方面第一种可能的实现方式中，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
第六方面，本发明实施例提供了一种接入网设备，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述接入网设备包括：
处理器、接口电路、存储器和总线，所述处理器、接口电路和存储器通过所述总线连接并完成相互间的通信，其中，所述存储器中存储一组程序代码，所述处理器用于调用所述存储器中存储的程序代码，执行以下操作：
通过接口电路接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述接入网设备发送的；
根据所述语音承载建立指示信息，为所述终端建立语音承载；
通过接口电路向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
结合第六方面的实现方式，在第六方面第一种可能的实现方式中，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
通过上述方案，第一接入网设备在接收到核心网设备发送的承载建立请求 消息时，向核心网设备发送承载建立响应消息，通知核心网设备语音承载建立层，然后在将终端切换到目标小区时，于切换过程中触发语音承载在该目标小区的建立，这样，在第一接入网设备不适于建立语音承载时，虽然其并没有建立语音承载，但仍向核心网设备发送了承载建立成功的响应消息，使得核心网设备就不会认为承载建立失败，而等待切换成功后再向终端新切入的小区发送承载建立请求消息，为后续切换过程中在目标小区准备好语音资源后的继续通信做好了保障，使得终端在进行小区切换后可直接使用提前准备的资源建立语音承载，完成对语音呼叫业务的处理，降低了语音呼叫的时延，减少了用户等待的时间。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为一种现有的语音承载建立过程的示意图；
图2为本发明实施例提供的一种语音承载的建立方法的流程示意图；
图3为本发明实施例提供的另一种语音承载的建立方法的流程示意图；
图4为本发明实施例提供的一种X2切换过程中语音承载建立方法的流程示意图；
图5为本发明实施例提供的一种S1切换过程中语音承载建立方法的流程示意图；
图6为本发明实施例提供的一种站内切换过程中语音承载建立方法的流程示意图；
图7是本发明实施例提供的一种接入网设备的组成示意图；
图8是本发明实施例提供的另一种接入网设备的组成示意图；
图9是本发明实施例提供的又一种接入网设备的组成示意图；
图10是本发明实施例提供的又一种接入网设备的组成示意图；
图11是本发明实施例提供的又一种接入网设备的组成示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在本申请中，考虑到了终端驻留小区无法建立语音承载时所带来的接入时延较大的问题，在接入网设备无法建立语音承载时，虽然不进行语音承载的建立，但仍通知核心网设备承载建立成功，并在切换过程中建立语音承载；以便目标接入网设备提前准备语音资源，减少接入时延，提高用户体验。
首先，对本申请中的部分用语进行解释说明，以便于本领域技术人员理解。
1)、接入网用于将终端接入到无线网络，接入网设备包括但不限于：演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(Base Station Controller，BSC)、基站收发台(Base Transceiver Station,BTS)、家庭基站(例如，Home evolved NodeB，或Home Node B，HNB)、基带单元(BaseBand Unit，BBU)、Wifi接入点(Access Point，AP)等。
2)、核心网用于为终端提供管理和外部网络的连接。核心网设备包括但不限于移动性管理实体(Mobility Management Entity，MME)、通用分组无线系统(General Packet Radio System，GPRS)业务支撑节点(serving GPRS support node，SGSN)、移动交换中心(Mobile Switching Center，MSC)等。
3)、终端，又称之为用户设备(User Equipment，UE)，是一种向用户提供语音和/或数据连通性的设备，例如，具有无线连接功能的手持式设备、连接到无线调制解调译码器的其他处理设备等。
下面结合附图对以上承载建立过程进行举例说明。
请参考图2，其为本发明实施例提供的一种语音承载的建立方法的流程示意图。该方法用于终端语音承载的建立，且终端驻留在第一接入网设备所提供的小区(以下称为驻留小区)，且该第一接入网设备不适于建立语音承载。如图2所示，该方法包括如下步骤：
S201：第一接入网设备接收核心网设备发送的承载建立请求消息，其中，该承载建立请求消息用于请求第一接入网设备建立语音承载；
S202：第一接入网设备向核心网设备发送承载建立响应消息，该承载建立响应消息用于通知核心网设备语音承载建立成功；
S203：第一接入网设备将终端切换到目标小区，且在切换过程中触发语音承载在目标小区的建立。
可见，在以上方法中，第一接入网设备虽然不适于建立语音承载，但其仍然向核心网设备返回语音承载建立成功的消息，且在后续切换过程中触发语音承载在相邻小区的建立，如此在切换过程中提前准备好了语音资源，不需要等到切换完成后再进行语音承载的建立，减少了语音接入时延，提高了用户体验。
需要说明的是，在本申请中：第一接入网设备不适于建立语音承载包括不能建立语音承载和语音服务服务质量较差不适合进行语音通信的情景之一或全部。语音服务质量较差可以通过设置语音业务质量门限来判断，本申请不做任何限制。
在以上步骤S201中，所述承载建立请求消息中可以携带语音承载建立指示信息，该语音承载建立指示信息用于指示需建立的承载为语音承载。例如，上述语音承载建立指示信息可以使用服务质量等级标识(Quality of Service Class Identifier，简称QCI)。QCI用于描述终端与策略及计费执行功能实体(Policy and Charging Enforcement Function，简称PCEF)之间数据传输的特性，主要包含4个信息：资源类型(Resource Type)、资源优先级(Priority)、数据时延(Packet Delay Budget)、数据丢包率(Packet Error Loss Rate)。QCI是一个标度值，每种业务需要不同等级的QCI来确保传输质量。数据无线承载(Data Radio Bearer，DRB)上的QCI中，QCI1、QCI2和QCI5都是语音相关的QCI。其中，QCI1承载语音业务，QCI2承载视频业务，QCI5承载语音业务的会话初始化协议(英文：Session Initiation Protocol，缩写：SIP)信令，例如，建立和释放语音业务所用的SIP信令。在建立语音业务时，通过在QCI5发送SIP信令给核心网设备，触发核心网建立QCI1承载来完成，或者，对于可视电话需要建立QCI1和QCI2承载来完成。在结束语音业务时，在QCI5上传输相应的SIP信令，以触发核心网设备释放QCI1来完成，或者，对于可视电话业 务，需要释放QCI1和QCI2来完成，认为通话结束。因此，对于语音业务，QCI1可以用于指示需要建立的承载为语音承载，即可以利用QCI1作为语音承载建立指示信息。对于可视电话业务，可以利用QCI1和QCI2作为语音承载建立指示信息。此外，也可以定义一个信息用于指示需要建立的承载为语音承载，本申请对此不做任何限制。
在以上步骤S202中，由于第一接入网设备不适于建立语音承载，因此其并没有建立语音承载，但其仍向核心网设备发送了承载建立成功的响应消息。这样核心网设备就不会认为承载建立失败，而等待切换成功后再向终端新切入的小区发送承载建立请求消息。为后续切换过程中在目标小区准备好语音资源后的继续通信做好保障。
在以上步骤S203之前，第一接入网设备可以选择切换的目标小区。请参考图3，其为本发明实施例提供的另一种语音承载的建立方法的流程示意图。其中，步骤S301-S302与步骤S201-S202相同，此处不再赘述，在与步骤S203相同的步骤S305之前，该方法还包括：
S303：第一接入网设备获取驻留小区的相邻小区的状态信息；
S304：根据所获取的状态信息，从相邻小区中选择目标小区。
以上状态信息可以包括语言业务处理能力，第一接入网设备根据该状态信息，从驻留小区的相邻小区中选择具有语音业务处理能力的小区作为目标小区。当相邻小区只有一个时，如果相邻小区的状态信息显示该相邻小区适合建立语音承载，则将该相邻小区作为目标小区。当相邻小区有多个时，如果只有一个相邻小区适合建立语音承载，则将该适合建立语音承载的相邻小区作为目标小区；如果不止一个相邻小区适合建立语音承载，则从中任选一个作为目标小区，或者依据其它状态信息选择一个最佳小区作为目标小区。
例如，时分双工(Time Division Duplex，TDD)小区不适于建立语音承载，而频分双工(Frequency Division Duplex，FDD)小区适合建立语音承载，因此，当驻留小区为TDD小区时，便可以从其相邻小区中选择一个FDD小区作为目标小区，将终端切换过去，并在切换过程中触发语音承载在目标小区的建立。
以上从适合建立语音承载的相邻小区中选择目标小区的依据可以包括相邻小区的信号质量，也可以包括相邻小区的负载。例如，选择信号质量最好的 相邻小区最为目标小区，或者选择负载最低的相邻小区作为目标小区。此处，仅为举例并非用于限制本申请。
信号质量可以通过终端测量并上报得到，相邻小区的负载可以通过基站之间的交互获得。当然，如果相邻小区和驻留小区属于同一个接入网设备，则不需要基站间交互既可以获得。
在以上步骤S203中，如果驻留小区和目标小区属于不同接入网设备，则以上切换过程是指站间切换，包括S1切换和X2切换。例如，在长期演进(Long Term Evolution，LTE)系统中，如果接入网设备(eNB)之间建立有X2口，则可以进行X2切换，如果没有X2口，则进行S1切换。对于接入网设备之间不存在直接连接的网络制式，站间切换通常为S1切换。此外，异系统之间的切换，即源接入网设备和目标接入网设备属于不同的网络制式下的切换，站间切换通常为S1切换。如果驻留小区和目标小区属于相同的接入网设备，则以上切换过程是指站内切换。下面以长期演进(Long Term Evolution，LTE)为例，结合图4和图5来分别描述站间的S1切换过程中承载的建立和X2切换过程中承载的建立；并结合图6来描述站内切换过程中承载的建立。
请参照图4，其为本发明实施例提供的一种X2切换过程中语音承载建立方法的流程示意图。在本实施例中，以第一接入网设备为eNB1，第二接入网设备为eNB2，核心网设备为移动管理实体MME进行举例说明。其中eNB1选取的相邻小区位于eNB2，且通过X2切换将终端从eNB1切换到eNB2。
所述方法包括以下步骤：
S401：终端向MME发送服务请求，发起语音呼叫。
S402：MME向eNB1发送承载建立请求消息，所述承载建立请求消息用于请求eNB1建立语音承载。
S403：eNB1返回承载建立响应消息，通知MME语音承载建立成功。
S404：eNB1选取当前驻留小区的相邻小区，发起X2切换流程，其中相邻小区位于eNB2。
S405：eNB1向eNB2发送切换请求消息，携带语音承载建立指示信息，所述语音承载建立指示信息用于指示eNB2建立语音承载。
这样eNB2便可以根据该切换请求消息提前准备语音承载的资源。
需要说明的是，此处的提前准备是指在终端切换小区之前进行语音承载的资源准备。
以下继续描述切换的过程，但以下过程为仅为一种现有切换过程的举例，并非用于限制本申请。
S406：eNB2进行资源准入，为终端的接入分配空口资源和语音的承载资源。
S407：eNB2资源准入成功后，向eNB1发送切换请求确认(handover request acknowledge)消息，指示切换准备工作完成。
S408：eNB1指示终端进行切换，例如，可以向终端发送RRC连接重配置消息指示终端执行切换。
S409：当终端成功接入目标小区后，终端告知eNB2切换过程完成，例如，终端向第二基站发送RRC连接重配置完成消息，向第二基站确认切换过程完成。
S410：eNB2向MME发送请求消息，请求更新业务数据通道的节点地址。
S411：MME更新数据通道节点地址后，向eNB2发送确认消息，表示可以在新的承载上进行业务通信。
S412：终端已经接入目标小区，并且可以在目标小区进行业务通信，此时，eNB2指示eNB1释放终端的资源和上下文；
S413：eNB1释放终端的上下文和资源。
当eNB2为X2切换提前准备好语音承载的资源后，便可以根据TS36.300协议定义的切换流程进行小区切换，快速使用已准备的资源建立语音承载并处理语音呼叫业务，减少语音呼叫的时延。
请参照图5，其为本发明实施例提供的一种S1切换过程中语音承载建立方法的流程示意图。在本实施例中，以第一接入网设备为eNB1，第二接入网设备为eNB2，核心网设备为MME进行举例说明。其中eNB1选取的相邻小区位于eNB2，且通过S1切换将终端从eNB1切换到eNB2。
所述方法包括以下步骤：
步骤S501-S503与步骤S401-S403相同，可参照S401-S403，此处不再赘述。
S504：eNB1选取当前驻留小区的相邻小区，发起S1切换流程。
S505：eNB1向MME发送切换请求消息，携带语音承载建立指示消息，所述语音承载建立指示信息用于指示eNB2建立语音承载。
这样，移动管理实体便可以通知eNB2提前准备语音承载的资源。
S506：MME发送切换请求消息给eNB2。
以下继续描述切换的过程，但以下过程为仅为一种现有切换过程的举例，并非用于限制本申请。
S507：eNB2进行资源准入，为终端的接入分配空口资源和语音的承载资源。
S508：eNB2资源准入成功后，向MME发送切换请求确认消息，指示切换准备工作完成。
S509：MME发送切换指示至eNB1，告知其eNB2的地址等信息。
S510：eNB1指示终端进行切换，例如，可以向终端发送RRC连接重配置消息指示终端执行切换。
S511：当终端成功接入目标小区后，终端告知eNB2切换过程完成，例如，终端向eNB2发送RRC连接重配置完成消息，向eNB2确认切换过程完成。
S512：终端已经接入目标小区，并且可以在目标小区进行业务通信，此时，eNB2指示eNB1释放终端的资源和上下文；
S513：eNB1释放终端的上下文和资源。
当MME通知eNB2为S1切换提前准备好语音承载的资源后，便可以在小区切换后，快速使用已准备的资源建立语音承载并处理语音呼叫业务，减少语音呼叫的时延。
请参照图6，其为本发明实施例提供的一种站内切换过程中语音承载建立方法的流程示意图。在本实施例中，以第一接入网设备为eNB1，核心网设备为MME进行举例说明。其中eNB1选取的相邻小区位于站内。因此不需要进行基站间的切换。
所述方法包括以下步骤：
步骤S601-S603与步骤S401-S403相同，可参照S401-S403，此处不再赘述。
S604：eNB1选取当前驻留小区的相邻小区，发起站内切换流程，为终端提前准备语音承载的资源。
站内切换主要是通过RRC重配置实现的，即向终端发送RRC重配置消息，通过该重配置消息为终端配置选取的相邻小区作为其服务小区。该RRC重配置消息可以称为站内切换的切换命令消息。即包括如下步骤：
S605：eNB1向终端发送切换命令消息，携带为终端建立的语音承载。
S606：当eNB1为小区切换提前准备好语音承载的资源后，便可以告知终端为其建立的语音承载的资源，然后在小区切换完成后，快速使用已准备的资源建立语音承载并处理语音呼叫业务，减少语音呼叫的时延。
请参照图7，为本发明实施例提供的一种接入网设备的组成示意图，所述接入网设备用于终端语音承载的建立，所述终端驻留在所述接入网设备所提供的小区，且所述接入网设备不适于建立语音承载，在本实施例中，所述接入网设备包括：
接收单元100，用于接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述接入网设备建立语音承载；
发送单元200，用于向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
切换单元300，用于将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
可选地，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
可选地，当所述目标小区属于第二接入网设备时，所述切换单元300具体用于：
向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
可选地，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
可选地，当所述目标小区属于所述接入网设备时，所述切换单元300具体用于：
在所述目标小区为所述终端建立语音承载；向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
需要说明的是，接入网设备包括但不限于：演进型节点B、无线网络控制器、节点B、基站控制器、基站收发台、家庭基站、基带单元、Wifi接入点等。本实施例中的接收单元和发送单元可以为接入网设备接口电路，该接口电路用于实现与核心网设备的通信，例如可以为S1接口电路，用于实现S1接口协议。且该接口电路可以连接于接入网设备的处理器，处理器根据接收到的承载建立请求消息，生成承载建立响应消息，并通过接口电路发送给核心网设备。切换单元可以为单独设立的处理器，也可以集成在接入网设备的某一个处理器中实现，此外，也可以以程序代码的形式存储于接入网设备的存储器中，由接入网设备的某一个处理器调用并执行以上切换单元的功能。这里所述的处理器可以是一个中央处理器(Central Processing Unit，CPU)，或者是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路。
请参照图8，为本发明实施例提供的另一种接入网设备的组成示意图，与图7所示的接入网设备相比，本发明实施例中的接入网设备还包括：
获取单元400，用于获取所述终端所驻留的所述小区的相邻小区的状态信息；
选择单元500，用于根据所述获取单元400所获取的状态信息，从相邻小区中选择所述目标小区。
可选地，所述状态信息包括语音业务处理能力。
可选地，所述状态信息还包括信号质量和负载之一或全部。
与图7所示实施例类似地，本实施例中的接收单元、发送单元、切换单元的实现同以上实施例的描述。获取单元和选择单元的实现同切换单元，且可以与切换单元集成在一起，也可以独立实现。且获取单元可以通过接入网设备的收发机与终端交互，获得状态信息；也可以通过与其它接入网设备的接口电路与其它接入网设备交互，获得状态信息。这里所述的处理器可以是一个中央处理器(Central Processing Unit，CPU)，或者是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集 成电路。
请参照图9，为本发明实施例提供的又一种接入网设备的组成示意图，所述接入网设备用于终端语音承载的建立，所述终端驻留在所述接入网设备所提供的小区，且所述接入网设备不适于建立语音承载，在本实施例中，所述接入网设备包括：
处理器1101、第一接口电路1102、第二接口电路1103、存储器1104、总线1105和收发机1106，所述处理器1101、第一接口电路1102、第二接口电路1103、收发机1106和存储器1104通过所述总线1105连接并完成相互间的通信，其中，所述存储器1104中存储一组程序代码，所述处理器1101用于调用所述存储器1104中存储的程序代码，执行以下操作：
通过第一接口电路1102接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述接入网设备建立语音承载；
通过第一接口电路1102向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
可选地，所述处理器1101还用于：
获取所述终端所驻留的所述小区的相邻小区的状态信息；
根据所获取的状态信息，从相邻小区中选择所述目标小区。
具体，处理器1101可以通过收发机1106从终端获得状态信息，也可以通过该接入网设备与其它接入网设备的第二接口电路1103获得状态信息。
其中，所述状态信息包括语音业务处理能力。
可选地，所述状态信息还包括信号质量和负载之一或全部。
所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
当所述目标小区属于第二接入网设备时，所述处理器1101具体用于：
通过第二接口电路1103向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
其中，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请 求消息为S1切换请求消息或X2切换请求消息。
可选地，当所述目标小区属于所述第一接入网设备时，所述处理器1101具体用于：
在所述目标小区为所述终端建立语音承载；通过收发机1106向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
需要说明的是，这里的处理器1101可以是一个处理器，也可以是多个处理元件的统称。例如，该处理器可以是中央处理器(Central Processing Unit，CPU)，也可以是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路，例如：一个或多个微处理器(digital signal processor，DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，FPGA)。
存储器1103可以是一个存储装置，也可以是多个存储元件的统称，且用于存储可执行程序代码或接入网设备运行所需要参数、数据等。且存储器1103可以包括随机存储器(RAM)，也可以包括非易失性存储器(non-volatile memory)，例如磁盘存储器，闪存(Flash)等。
总线1104可以是工业标准体系结构(Industry Standard Architecture，ISA)总线、外部设备互连(Peripheral Component，PCI)总线或扩展工业标准体系结构(Extended Industry Standard Architecture，EISA)总线等。该总线1104可以分为地址总线、数据总线、控制总线等。为便于表示，图9中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
请参照图10，为本发明实施例提供的又一种接入网设备的组成示意图，所述接入网设备用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述接入网设备包括：
接收单元600，用于接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述接入网设备发送的；
建立单元700，用于根据所述语音承载建立指示信息，为所述终端建立语音承载；
发送单元800，用于向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
可选地，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
需要说明的是，接入网设备包括但不限于：演进型节点B、无线网络控制器、节点B、基站控制器、基站收发台、家庭基站、基带单元、Wifi接入点等。本实施例中的接收单元和发送单元可以为接入网设备的接口电路，例如X2接口电路或S1接口电路，该接口电路用于实现与其它接入网设备的通信，以从其它接入网设备接收语音承载建立指示信息，并将语音承载建立响应发送给其它接入网设备；或者该接口电路用于实现与核心网设备的通信，以接收核心网设备转发的其它接入网设备的语音承载建立指示信息，并通过核心网设备转发语音承载建立响应给其它接入网设备。建立单元可以为单独设立的处理器，也可以集成在接入网设备的某一个处理器中实现，此外，也可以以程序代码的形式存储于接入网设备的存储器中，由接入网设备的某一个处理器调用并执行以上建立单元的功能。这里所述的处理器可以是一个中央处理器(Central Processing Unit，CPU)，或者是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路。
请参照图11，为本发明实施例提供的又一种接入网设备的组成示意图，所述接入网设备用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述接入网设备包括：
处理器2101、接口电路2102、存储器2103和总线2104，所述处理器2101、接口电路2102和存储器2103通过所述总线2104连接并完成相互间的通信，其中，所述存储器2103中存储一组程序代码，所述处理器2101用于调用所述存储器2103中存储的程序代码，执行以下操作：
通过接口电路2102接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述接入网设备发送的；
根据所述语音承载建立指示信息，为所述终端建立语音承载；
通过接口电路2102向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
以上接口电路2102可以是与其它接入网设备进行交互的接口电路，例如X2接口电路，以从其它接入网设备接收语音承载建立指示信息，并将语音承载建立响应发送给其它接入网设备；也可以是与核心网设备进行交互的接口电路，例如S1接口电路，以接收核心网设备转发的其它接入网设备的语音承载建立指示信息，并通过核心网设备转发语音承载建立响应给其它接入网设备。
可选地，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
需要说明的是，这里的处理器2101可以是一个处理器，也可以是多个处理元件的统称。例如，该处理器可以是中央处理器(Central Processing Unit，CPU)，也可以是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路，例如：一个或多个微处理器(digital signal processor，DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，FPGA)。
存储器2103可以是一个存储装置，也可以是多个存储元件的统称，且用于存储可执行程序代码或接入网管理设备运行所需要参数、数据等。且存储器2103可以包括随机存储器(RAM)，也可以包括非易失性存储器(non-volatile memory)，例如磁盘存储器，闪存(Flash)等。
总线2104可以是工业标准体系结构(Industry Standard Architecture，ISA)总线、外部设备互连(Peripheral Component，PCI)总线或扩展工业标准体系结构(Extended Industry Standard Architecture，EISA)总线等。该总线1104可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置实施例而言，由于其与方法实施例基本相似，所以 描述的比较简单，相关之处参见方法实施例的部分说明即可。
通过上述实施例的描述，本发明具有以下优点：
第一接入网设备在接收到核心网设备发送的承载建立请求消息时，向核心网设备发送承载建立响应消息，通知核心网设备语音承载建立层，然后在将终端切换到目标小区时，于切换过程中触发语音承载在该目标小区的建立，这样，在第一接入网设备不适于建立语音承载时，虽然其并没有建立语音承载，但仍向核心网设备发送了承载建立成功的响应消息，使得核心网设备就不会认为承载建立失败，而等待切换成功后再向终端新切入的小区发送承载建立请求消息，为后续切换过程中在目标小区准备好语音资源后的继续通信做好了保障，使得终端在进行小区切换后可直接使用提前准备的资源建立语音承载，完成对语音呼叫业务的处理，降低了语音呼叫的时延，减少了用户等待的时间。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上对本发明实施例所提供的一种语音承载的建立方法及接入网设备进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

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  1. 一种语音承载的建立方法，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，其特征在于，所述方法包括：
    所述第一接入网设备接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述第一接入网设备建立语音承载；
    所述第一接入网设备向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
    所述第一接入网设备将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
  2. 如权利要求1所述的方法，其特征在于，所述第一接入网设备将所述终端切换到目标小区之前，还包括：
    所述第一接入网设备获取所述终端所驻留的所述小区的相邻小区的状态信息；
    根据所获取的状态信息，从相邻小区中选择所述目标小区。
  3. 如权利要求2所述的方法，其特征在于，所述状态信息包括语音业务处理能力。
  4. 如权利要求3所述的方法，其特征在于，所述状态信息还包括信号质量和负载之一或全部。
  5. 如权利要求1至4任一项所述的方法，其特征在于，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
  6. 如权利要求1至5任一项所述的方法，其特征在于，当所述目标小区属于第二接入网设备时，所述第一接入网设备在切换过程中触发语音承载在所 述目标小区的建立，包括：
    所述第一接入网设备向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
  7. 如权利要求6所述的方法，其特征在于，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
  8. 如权利要求1至5任一项所述的方法，其特征在于，当所述目标小区属于所述第一接入网设备时，所述第一接入网设备在切换过程中触发语音承载在所述目标小区的建立，还包括：
    在所述目标小区为所述终端建立语音承载；
    向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
  9. 一种语音承载的建立方法，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，所述方法包括：
    第二接入网设备接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述第二接入网设备发送的；
    所述第二接入网设备根据所述语音承载建立指示信息，为所述终端建立语音承载；
    所述第二接入网设备向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
  10. 根据权利要求9所述的方法，其特征在于，所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
  11. 一种接入网设备，用于终端语音承载的建立，所述终端驻留在所述接入网设备所提供的小区，且所述接入网设备不适于建立语音承载，其特征在于，所述接入网设备包括：
    接收单元，用于接收核心网设备发送的承载建立请求消息，其中，所述承载建立请求消息用于请求所述接入网设备建立语音承载；
    发送单元，用于向所述核心网设备发送承载建立响应消息，所述承载建立响应消息用于通知所述核心网设备语音承载建立成功；
    切换单元，用于将所述终端切换到目标小区，且在切换过程中触发语音承载在所述目标小区的建立。
  12. 如权利要求11所述的接入网设备，其特征在于，所述接入网设备还包括：
    获取单元，用于获取所述终端所驻留的所述小区的相邻小区的状态信息；
    选择单元，用于根据所述获取单元所获取的状态信息，从相邻小区中选择所述目标小区。
  13. 如权利要求12所述的接入网设备，其特征在于，所述状态信息包括语音业务处理能力。
  14. 如权利要求13所述的接入网设备，其特征在于，所述状态信息还包括信号质量和负载之一或全部。
  15. 如权利要求11-14任一项所述的接入网设备，其特征在于，所述终端驻留的小区为时分双工TDD小区，所述目标小区为频分双工FDD小区。
  16. 如权利要求11-15任一项所述的接入网设备，其特征在于，当所述目标小区属于第二接入网设备时，所述切换单元具体用于：
    向所述第二接入网设备发送语音承载建立指示信息，所述语音承载建立指示信息用于指示所述第二接入网设备建立语音承载。
  17. 如权利要求16所述的接入网设备，其特征在于，所述语音承载建立指示信息携带在切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息。
  18. 如权利要求11-15任一项所述的接入网设备，其特征在于，当所述目标小区属于所述接入网设备时，所述切换单元具体用于：
    在所述目标小区为所述终端建立语音承载；向所述终端发送切换命令消息，所述切换命令消息中携带为所述终端建立的语音承载。
  19. 一种接入网设备，用于终端语音承载的建立，所述终端驻留在第一接入网设备所提供的小区，且所述第一接入网设备不适于建立语音承载，其特征在于，所述接入网设备包括：
    接收单元，用于接收所述第一接入网设备发送的语音承载建立指示信息，该语音承载建立指示信息由所述第一接入网设备在接收到核心网设备发送的语音承载建立请求后向所述接入网设备发送的；
    建立单元，用于根据所述语音承载建立指示信息，为所述终端建立语音承载；
    发送单元，用于向所述第一接入网设备发送语音承载建立响应，以通知所述第一接入网设备语音承载建立完成。
  20. 如权利要求19所述的接入网设备，其特征在于，
    所述语音承载建立指示信息携带于切换请求消息中，且所述切换请求消息为S1切换请求消息或X2切换请求消息；所述语音承载建立响应为切换请求确认消息。
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