CN105578537B

CN105578537B - A method, device and base station for voice call switching

Info

Publication number: CN105578537B
Application number: CN201410548784.1A
Authority: CN
Inventors: 姜怡
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2014-10-16
Filing date: 2014-10-16
Publication date: 2019-04-30
Anticipated expiration: 2034-10-16
Also published as: CN105578537A

Abstract

Embodiments of the present invention disclose a voice call switching method, device and base station, wherein the method includes: when detecting that a terminal initiates a voice call through a current cell of a first base station of a first network and moves to an adjacent cell, obtaining a Configuration information on whether multiple first network neighboring cells adjacent to the cell support voice services; according to the configuration information, when it is detected that there are first network neighboring cells that do not support voice services in the multiple first network neighboring cells, send a notification to the terminal. Send a measurement instruction; obtain the measurement results of the first network neighbor cell and the second network neighbor cell adjacent to the current cell in the second network reported by the terminal according to the measurement instruction; according to the measurement result and the configuration information, for the terminal Select the target cell for handover; handover the terminal's current voice call to the target cell. The solution of the present invention can select a suitable target cell for voice call switching, protect the user's voice call from being interrupted, and improve the user experience.

Description

A kind of method, apparatus of audio call switching and base station

Technical field

The present invention relates to the communications field, method, apparatus and the base station of a kind of audio call switching are particularly related to.

Background technique

LTE wireless network (3GPP Long Term Evolution) is needed if you need to support VoLTE business (voice service based on IMS) Function upgrading is carried out to the network elements such as eNB and MME (mobile management entity), during actual deployment, in fact it could happen that operator The network element updatings such as subregional eNB and MME support VoLTE business in the middle part of network, and another part eNB does not upgrade support VoLTE。

When VoLTE terminal is under the eNB covering for supporting VoLTE business, network will inform that terminal, terminal support VoLTE, Terminal will carry out VoLTE business by LTE.When terminal leaves LTE covering, if carrying out VoLTE calling, can pass through SRVCC (double-mode single-standby wireless voice call continuity) mechanism switches the call to 2G/3G circuit domain, guarantees the company of voice service It is continuous.

But when VoTE terminal enters the LTE covering for not supporting VoLTE business from the LTE covering of support VoLTE business, SRVCC can't be triggered, therefore when network attempts when establishing VoLTE carrying under target LTE is covered, meeting is due to target network VoLTE voice is not supported and can not establish the dedicated PDN connection of VoLTE, so that audio call interrupts, user experience is brought Larger impact.

Summary of the invention

The method, apparatus switched the technical problem to be solved in the present invention is to provide a kind of audio call and base station, so as to So that VoTE terminal, when entering the LTE covering for not supporting VoLTE business from the LTE covering of support VoLTE business, Ke Yixuan The switching that suitable Target cell carries out audio call is selected, the audio call of user is protected not interrupt, improves user experience.

In order to solve the above technical problems, the embodiment of the present invention provides a kind of method of audio call switching, comprising:

Detect that terminal is initiated audio call by the current area of the first base station of first network and is moved to adjacent small Qu Shi obtains the configuration information whether multiple first network adjacent cells adjacent with current area support voice service；

According to the configuration information, the first net for existing in multiple first network adjacent cells and not supporting voice service is detected When network adjacent cell, measurement instruction is sent to terminal；

Obtain terminal according to the measurement instruction report in first network adjacent cell and the second network with currently it is small The measurement result of the second adjacent network adjacent cell of area；

According to the measurement result and configuration information, for the Target cell of terminal selection switching；

The current audio call of terminal is switched to Target cell.

It wherein, is that the step of terminal selects the Target cell switched includes: according to the measurement result and configuration information

When in measurement result there are signal strength be higher than a preset value, and support voice service first network adjacent cell, Selecting the first network adjacent cell is switching target small area；Or

When the first network adjacent cell in measurement result there are signal strength higher than a preset value, and first network neighbour is small Area does not support voice service, then selects the second network adjacent cell for the Target cell of switching；Or

When the signal strength of first network adjacent cells all in measurement result is below voice service desired signal intensity threshold Value then selects the second network adjacent cell for the Target cell of switching.

Wherein, first network is LTE network, and audio call is VoLTE calling, and the second network is 2G/3G network.

Wherein, when selecting the first network adjacent cell as switching target small area, the current audio call of terminal is switched to The step of Target cell includes:

Switching request of the base station belonging to current area to mobility management entity MME initiation packet domain to packet domain, and Sv interface between mobile switching center server MSC Server is passed through by MME and initiates double-mode single-standby wireless voice call company Continuous property SRVCC switching flow, is switched to mobile switching center server MSC Server for voice bearer, complete by MSC Server While at carrying switching flow, the session switching flow for arriving IP multimedia subsystem IMS domain is initiated, instruction IMS domain completes meeting Switching of the session layer to first network adjacent cell.

Wherein, select the second network adjacent cell for switching Target cell when, the current audio call of terminal is switched to The step of Target cell includes:

Base station belonging to current area is asked to the switching that mobility management entity MME initiates packet domain PS to circuit domain CS It asks；Pass through the initiation double-mode single-standby wireless speech of the Sv interface between mobile switching center server MSC Server by MME to exhale It is continuity SRVCC switching flow, voice bearer is switched to MSC Server, carrying switching flow is completed by MSC Server While, the session switching flow for arriving IP multimedia subsystem IMS domain is initiated, instruction IMS domain completes session layer to the second network The switching of adjacent cell.

The embodiment of the present invention also provides a kind of device of audio call switching, comprising:

Detection module, for detecting that terminal initiates audio call simultaneously by the current area of the first base station of first network When being moved to neighboring community, the configuration whether multiple first network adjacent cells adjacent with current area support voice service is obtained Information；

Sending module does not support language for according to the configuration information, detecting to exist in multiple first network adjacent cells When the first network adjacent cell of sound business, measurement instruction is sent to terminal；

Obtain module, for obtain terminal according to the measurement instruction report to first network adjacent cell and the second net The measurement result of the second network adjacent cell adjacent with current area in network；

Determining module, for selecting the Target cell of switching for terminal according to the measurement result and configuration information；

Switching module, for the current audio call of terminal to be switched to Target cell.

Wherein, obtaining module includes:

First obtains submodule, for when there are signal strengths to be higher than a preset value, and support voice industry in measurement result The first network adjacent cell of business, selecting the first network adjacent cell is switching target small area；Or

Second obtains submodule, for when there are signal strength is small higher than the first network neighbour of a preset value in measurement result Area, and the first network adjacent cell does not support voice service, then selects the second network adjacent cell for the Target cell of switching；Or

Third obtains submodule, for being below voice when the signal strength of all first network adjacent cells in measurement result Business desired signal intensity threshold then selects the second network adjacent cell for the Target cell of switching.

Wherein, switching module is specifically used for the switching request to mobility management entity MME initiation packet domain to packet domain, Sv interface between mobile switching center server MSC Server is passed through by MME and initiates double-mode single-standby wireless voice call company Continuous property SRVCC switching flow, is switched to MSC Server for voice bearer, completes the same of carrying switching flow by MSC Server When, the session switching flow for arriving IP multimedia subsystem IMS domain is initiated, it is small to first network neighbour that instruction IMS domain completes session layer The switching in area.

Wherein, switching module is specifically used for: the switching of packet domain PS to circuit domain CS is initiated to mobility management entity MME Request；Sv interface between mobile switching center server MSC Server is passed through by MME and initiates double-mode single-standby wireless speech Voice bearer is switched to MSC Server by call continuity SRVCC switching flow, completes carrying switching stream by MSC Server While journey, the session switching flow for arriving IP multimedia subsystem IMS domain is initiated, instruction IMS domain completes session layer to the second net The switching of network adjacent cell.

The embodiment of the present invention also provides a kind of base station, including device as described above.

The advantageous effects of the above technical solutions of the present invention are as follows:

Above scheme of the invention is by detecting that terminal initiates language by the current area of the first base station of first network When sound calls and is moved to neighboring community, obtain whether the multiple first network adjacent cells adjacent with current area support voice industry The configuration information of business；According to the configuration information, detects to exist in multiple first network adjacent cells and do not support voice service When first network adjacent cell, measurement instruction is sent to terminal；Obtain terminal according to the measurement instruction report to first network The measurement result of the second network adjacent cell adjacent with current area in adjacent cell and the second network；According to the measurement result And configuration information, for the Target cell of terminal selection switching；The current audio call of terminal is switched to Target cell, thus It is able to detect that target LTE covering lower network does not support VoLTE, and then triggers SRVCC switching, switch the call to 2G/3G electricity Road domain, to guarantee the continuity of voice service.

Detailed description of the invention

Fig. 1 shows the method flow diagrams of audio call of the invention switching；

Fig. 2 indicates the specific embodiment flow chart of the method for audio call switching of the invention；

Fig. 3 indicates audio call SRVCC switching flow schematic diagram of the invention.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, right below in conjunction with the accompanying drawings and the specific embodiments The present invention is described in detail.

The embodiment of the present invention is to solve in the prior art, does not support VoLTE in target LTE covering lower network, cannot touch The problem of sending out SRVCC switching, the embodiment of the present invention provides a kind of audio call switching method and device, can be in target LTE Covering lower network does not support VoLTE, 2G/3G circuit domain is switched the call to, to guarantee the continuity of voice service.

As shown in Figure 1, the embodiment of the present invention provides a kind of method of audio call switching, comprising:

Step 11, detect that terminal is initiated audio call by the current area of the first base station of first network and is moved to When neighboring community, the configuration information whether multiple first network adjacent cells adjacent with current area support voice service is obtained；

Step 12, it according to the configuration information, detects to exist in multiple first network adjacent cells and does not support voice service First network adjacent cell when, to terminal send measurement instruction；

Step 13, obtain terminal according to the measurement instruction report in first network adjacent cell and the second network with The measurement result of the second adjacent network adjacent cell of current area；

Step 14, according to the measurement result and configuration information, for the Target cell of terminal selection switching；

Step 15, the current audio call of terminal is switched to Target cell.

In the embodiment of the invention, detect that terminal initiates voice by the current area of the first base station of first network When calling and being moved to neighboring community, obtain whether the multiple first network adjacent cells adjacent with current area support voice service Configuration information；According to the configuration information, for existing in multiple first network adjacent cells and not supporting voice service is detected When one network adjacent cell, measurement instruction is sent to terminal；Acquisition terminal reports adjacent to first network according to the measurement instruction The measurement result of the second network adjacent cell adjacent with current area in cell and the second network；According to the measurement result with And configuration information, for the Target cell of terminal selection switching；The current audio call of terminal is switched to Target cell, so as to It enough detects that target LTE covering lower network does not support VoLTE, and then triggers SRVCC switching, switch the call to 2G/3G circuit Domain, to guarantee the continuity of voice service.

In a specific embodiment of the invention, including on the basis of above-mentioned steps 11-15, step 14 be specifically as follows as Under several situations:

Situation 1: when there are signal strengths to be higher than a preset value, and the first network neighbour of support voice service in measurement result Cell, selecting the first network adjacent cell is switching target small area；Wherein, which can be LTE adjacent cell, That is terminal is currently located LTE cell adjacent cell in the lte networks, terminal from be currently located LTE cell be moved in LTE network with When the adjacent LTE adjacent cell in current LTE cell, if LTE adjacent cell supports VoLTE business, select the LTE adjacent cell as The Target cell of VolTE service switching；

Situation 2: when there are the first network adjacent cell that signal strength is higher than a preset value, and first nets in measurement result Network adjacent cell does not support voice service, then selects the second network adjacent cell for the Target cell of switching；Wherein, the first network is adjacent Cell can be LTE adjacent cell, i.e. terminal is currently located LTE cell adjacent cell in the lte networks, and terminal is from being currently located LTE When cell is moved to LTE adjacent cell adjacent with current LTE cell in LTE network, if LTE adjacent cell does not support VoLTE business, It then can choose Target cell of the adjacent cell adjacent with current LTE cell in 2G or 3G network as VoLTE service switching；

Situation 3: when the signal strength of first network adjacent cells all in measurement result is below voice service desired signal Intensity threshold then selects the second network adjacent cell for the Target cell of switching；Wherein, which can be LTE Adjacent cell, i.e. terminal are currently located LTE cell adjacent cell in the lte networks, and terminal is moved to LTE from LTE cell is currently located In network when the LTE adjacent cell adjacent with current LTE cell, if the signal strength of all LTE adjacent cells is below voice service Required signal strength threshold then also can choose adjacent cell conduct adjacent with current LTE cell in 2G or 3G network The Target cell of VoLTE service switching.

Further, in above situation 1, when selecting the first network adjacent cell as switching target small area, above-described embodiment The switching flow that the current audio call of terminal is switched to Target cell includes: by middle step 15

Switching request of the base station belonging to current area to mobility management entity MME initiation packet domain to packet domain；

MME passes through the Sv interface between mobile switching center server MSC Server and initiates double-mode single-standby wireless speech Voice bearer is switched to mobile switching center server MSC Server by call continuity SRVCC switching flow；

While completing carrying switching flow by MSC Server, initiate to the session of IP multimedia subsystem IMS domain to cut Change of current journey, instruction IMS domain complete the switching of session layer to first network adjacent cell.

Further, in above situation 2 and 3, select the second network adjacent cell for switching Target cell when, above-mentioned implementation Example in step 15, include: by the switching flow that the current audio call of terminal is switched to Target cell

Base station belonging to current area is asked to the switching that mobility management entity MME initiates packet domain PS to circuit domain CS It asks；

MME passes through the Sv interface between mobile switching center server MSC Server and initiates double-mode single-standby wireless speech Voice bearer is switched to MSC Server by call continuity SRVCC switching flow；

While MSC Server completes carrying switching flow, initiate to the session of IP multimedia subsystem IMS domain to switch Process, instruction IMS domain complete the switching of session layer to the second network adjacent cell.

As shown in Fig. 2, the specific implementation flow of the above embodiment of the present invention includes:

1, VoLTE terminal is in the LTE covering for supporting VoLTE, and is carrying out a VoLTE calling；

2, VoLTE terminal will be moved to neighboring community from current area, and eNB discovery terminal is carrying out a VoLTE It calls, there is the LTE adjacent cell for not supporting VoLTE in neighboring community, therefore it is required that terminal measures the phase of LTE and 2G/3G simultaneously Adjacent cell；

3, terminal return measurement result；

4, eNB switches target to the support situation selection of VoLTE business according to measurement result and the LTE adjacent cell of configuration Cell:

5, when in measurement result some LTE adjacent cell signal it is preferable, and the cell also supports VoLTE business, selects the LTE Adjacent cell is switching target small area；ENB initiates PS to PS HO switching request to source MME；Follow-up process is standard PS to The normal process of PS HO switching, switches the call to target side network, guarantees call continuity；

6, when in measurement result some LTE adjacent cell signal it is preferable, but the cell does not support VoLTE business, then does not select The cell is switching target small area, but selects in 2G/3G the preferable cell of signal as Target cell；ENB is sent out to source MME Play PS to CS HO switching request；Follow-up process is the normal process of standard SRVCC switching, switches the call to target side 2G/ 3G circuit-domain network guarantees call continuity；

7, when in measurement result LTE adjacent cell signal be below VoLTE business needed for threshold value, then select signal in 2G/3G Preferable cell is as Target cell；ENB initiates PS to CS HO switching request to source MME；Follow-up process is standard The normal process of SRVCC switching, switches the call to target side 2G/3G circuit-domain network, guarantees call continuity；

As shown in figure 3, specific SRVCC switching flow includes:

1, E-UTRAN indicates that MME carries out SR VCC switching.

2, MME passes through the initiation SR VCC process of the Sv interface between MSC Server, and voice bearer is switched to MSC Server。

3, while MSC Server completes carrying switching flow, the session switching flow for arriving IMS domain is initiated, indicates IMS The switching of domain completion session layer.

4, after the bearing resource that MSC Server completes the domain CS prepares, E-UTRAN is passed through by Sv interface notification MME, MME Instruction UE starts to switch.

5, in step 2, MME can also initiate PS switching flow as needed, and non-voice carrying is switched to purpose The ps domain (SGSN) of GERAN/UTRAN.

The scheme for the SRVCC handover trigger that the above embodiment of the present invention proposes, configures adjacent LTE cell pair by eNB The support situation of VoLTE business；It is called when eNB discovery terminal is carrying out a VoLTE, exists in neighboring community and do not support The LTE cell of VoLTE, it is desirable that terminal measures the neighboring community of LTE and 2G/3G simultaneously；ENB is according to measurement result and configuration LTE adjacent cell selects switching target small area to the support situation of VoLTE business, initiates PS when LTE can support VoLTE business To PS switching flow, and SRVCC process is initiated when LTE cannot support VoLTE business；So as to detect that target LTE covers Lid lower network does not support VoLTE, and then triggers SRVCC switching, 2G/3G circuit domain is switched the call to, to guarantee voice industry The continuity of business.

Wherein, obtaining module includes: the first acquisition submodule, for when there are signal strengths to be higher than one in advance in measurement result If value, and support the first network adjacent cell of voice service, selecting the first network adjacent cell is switching target small area；Or

Switching module is specifically used for the switching request to mobility management entity MME initiation packet domain to packet domain, by MME Double-mode single-standby wireless voice call continuity is initiated by the Sv interface between mobile switching center server MSC Server Voice bearer is switched to MSC Server by SRVCC switching flow, while completing carrying switching flow by MSC Server, The session switching flow of IP multimedia subsystem IMS domain is initiated, instruction IMS domain completes session layer to first network adjacent cell Switching.

Switching module is specifically used for: the switching request of packet domain PS to circuit domain CS is initiated to mobility management entity MME； Sv interface between mobile switching center server MSC Server is passed through by MME and initiates double-mode single-standby wireless voice call company Continuous property SRVCC switching flow, is switched to MSC Server for voice bearer, completes the same of carrying switching flow by MSC Server When, the session switching flow for arriving IP multimedia subsystem IMS domain is initiated, it is small to the second network neighbour that instruction IMS domain completes session layer The switching in area.

It should be understood that the device is device corresponding to the above method embodiment, institute in above method embodiment There is implementation suitable for the embodiment of the device, can also reach identical technical effect.

In the above method of the invention, by detecting that terminal is initiated by the current area of the first base station of first network Audio call and when being moved to neighboring community, obtains whether the multiple first network adjacent cells adjacent with current area support voice The configuration information of business；According to the configuration information, detects to exist in multiple first network adjacent cells and do not support voice service First network adjacent cell when, to terminal send measurement instruction；Obtain terminal according to the measurement instruction report to the first net The measurement result of the second network adjacent cell adjacent with current area in network adjacent cell and the second network；It is tied according to the measurement Fruit and configuration information, for the Target cell of terminal selection switching；The current audio call of terminal is switched to Target cell, from And it is able to detect that target LTE covering lower network does not support VoLTE, and then trigger SRVCC switching, switch the call to 2G/3G Circuit domain, to guarantee the continuity of voice service.

Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come It says, can also make several improvements and retouch under the premise of not departing from principle of the present invention, these improvements and modifications also exist In protection scope of the present invention.

Claims

1. a method for voice call switching, characterized in that, comprising:

When it is detected that the terminal initiates a voice call through the current cell of the first base station of the first network and moves to an adjacent cell, obtain configuration information of whether a plurality of adjacent cells of the first network adjacent to the current cell support voice services;

According to the configuration information, when detecting that there is a first network neighboring cell that does not support the voice service in the multiple first network neighboring cells, sending a measurement instruction to the terminal;

Obtaining the measurement results of the first network neighbor cell and the second network neighbor cell adjacent to the current cell in the second network reported by the terminal according to the measurement instruction;

According to the measurement result and the configuration information, select the target cell for handover for the terminal;

Switch the current voice call of the terminal to the target cell;

The first network is an LTE network, the voice call is a VoLTE call, and the second network is a 2G/3G network.

2. The method for voice call handover according to claim 1, wherein, according to the measurement result and the configuration information, the step of selecting a target cell for handover for the terminal comprises:

When there is a first network neighbor cell whose signal strength is higher than a preset value and supports voice services in the measurement result, select the first network neighbor cell as the handover target cell; or

When there is a first network neighbor cell with a signal strength higher than a preset value in the measurement result, and the first network neighbor cell does not support voice services, the second network neighbor cell is selected as the target cell for handover; or

When the signal strengths of all the first network neighboring cells in the measurement result are lower than the signal strength threshold required for the voice service, the second network neighboring cell is selected as the target cell for handover.

3. The method for switching a voice call according to claim 2, wherein when selecting the first network neighbor cell as the switching target cell, the step of switching the current voice call of the terminal to the target cell comprises:

The base station to which the current cell belongs initiates a handover request from the packet domain to the packet domain to the mobility management entity MME, and the MME initiates the dual-mode single-standby wireless voice call continuity SRVCC handover process through the Sv interface with the mobile switching center server MSC Server , switch the voice bearer to the mobile switching center server MSC Server, while the MSC Server completes the bearer switching process, initiates the session switching process to the IMS domain of the IP multimedia subsystem, and instructs the IMS domain to complete the switching from the session layer to the first network adjacent cell. .

4. The method for voice call handover according to claim 2, wherein when selecting the second network adjacent cell as the target cell for handover, the step of switching the current voice call of the terminal to the target cell comprises:

The base station to which the current cell belongs initiates a handover request from the packet domain PS to the circuit domain CS to the mobility management entity MME; the MME initiates a dual-mode single-standby wireless voice call continuity SRVCC handover through the Sv interface with the mobile switching center server MSC Server In the process, the voice bearer is switched to the MSC Server. While the MSC Server completes the bearer switching process, it initiates a session switching process to the IMS domain of the IP multimedia subsystem, instructing the IMS domain to complete the switching from the session layer to the second network neighbor cell.

5. A device for voice call switching, comprising:

A detection module, configured to acquire the configuration of whether a plurality of adjacent cells of the first network adjacent to the current cell support voice services when the terminal initiates a voice call through the current cell of the first base station of the first network and moves to an adjacent cell information;

a sending module, configured to, according to the configuration information, send a measurement instruction to the terminal when detecting that there is a first network neighbor cell that does not support the voice service in the plurality of first network neighbor cells;

an obtaining module, configured to obtain the measurement results of the neighboring cell of the first network and the neighboring cell of the second network that are adjacent to the current cell in the second network and reported by the terminal according to the measurement instruction;

a determining module, configured to select a handover target cell for the terminal according to the measurement result and the configuration information;

a switching module, used for switching the current voice call of the terminal to the target cell;

6. The device for voice call switching according to claim 5, wherein the obtaining module comprises:

a first obtaining sub-module, configured to select the first network neighbor cell as the handover target cell when there is a first network neighbor cell whose signal strength is higher than a preset value and supports voice services in the measurement result; or

The second obtaining sub-module is configured to select the second network neighbor cell as the handover when there is a first network neighbor cell with a signal strength higher than a preset value in the measurement result, and the first network neighbor cell does not support voice services the target cell; or

The third obtaining submodule is configured to select the second network neighbor cell as the handover target cell when the signal strengths of all the first network neighbor cells in the measurement result are lower than the required signal strength threshold of the voice service.

7. the device of voice call switching according to claim 6, is characterized in that, switching module is specifically used to initiate the switching request of grouping domain to grouping domain to mobility management entity MME, by MME through and between mobile switching center server MSCServer The Sv interface between the two devices initiates the dual-mode single-standby wireless voice call continuity SRVCC switching process, and switches the voice bearer to the MSC Server. When the MSC Server completes the bearer switching process, it initiates the session switching process to the IMS domain of the IP Multimedia Subsystem. The IMS domain completes the handover from the session layer to the first network neighbor cell.

8. The device for voice call switching according to claim 6, wherein the switching module is specifically configured to: initiate a switching request from the packet domain PS to the circuit domain CS to the mobility management entity MME; The Sv interface between the servers MSC Server initiates a dual-mode single-standby wireless voice call continuity SRVCC switching process, and switches the voice bearer to the MSC Server. The MSC Server completes the bearer switching process and initiates a session to the IMS domain of the IP Multimedia Subsystem. The handover process is to instruct the IMS domain to complete the handover from the session layer to the adjacent cell of the second network.

9. A base station, comprising the device according to any one of claims 5-8.