CN104427560A - Single radio voice call continuity switching configuration method, switching method and device - Google Patents

Abstract

The present invention discloses a configuration method, a switching method and a device for single radio telephone tone call continuity switching, wherein the switching method includes: configuring the capability of a neighboring cell of a target terrestrial radio access network (UTRAN), and the corresponding configuration information is included in Indication information is added to the UTRAN neighboring cell capability; the indication information is the indication information of whether the UTRAN neighboring cell supports the Session Initiation Protocol (SIP); when the Single Radio Voice Call Continuity (SRVCC) handover process is initiated, whether the UTRAN neighboring cell is sent Supporting SIP indication information; receiving the indication information of whether the UTRAN neighbor cell supports SIP, and deciding whether to send the SIP service to the UTRAN for handover. Adopting the present invention at least solves the problem that SRVCC switching wastes resources and causes switching failure when it is not supported.

Description

Single radiotelephone tone call continuity handover configuration method, handover method and equipment

technical field

The present invention relates to the technical field of wireless communication, in particular to a single radio voice call continuity (SRVCC, Single Radio Voice Call Continuity) switching configuration method, switching method and equipment.

Background technique

SRVCC is a Voice over LTE (VoLTE, Voice-over-LTE) voice service continuity solution proposed by the Third Generation Partnership Project (3GPP, Third Generation Partnership Project), mainly to solve the problem when the user equipment (UE, User Equipment) When moving between Long Term Evolution (LTE, Long Term Evolution) networks and 3G/2G networks, how to ensure the continuity of voice calls, that is, to ensure that the UE is controlled by IP Multimedia Subsystem (IMS, IP Multimedia Subsystem) Voice over IP (VoIP , Voice over Internet Protocol) voice and circuit switching (CS, Circuit Switching) domain voice smooth switching.

There are different real-time services and non-real-time services in the IMS. Voice calls and video calls are real-time services, while instant messaging and RCS services are non-real-time services.

For VOIP in the real-time IMS service, IMS establishes two bearers: voice bearer service classification identifier (QCI, QoS Class Identifier) = 1 bearer, and session initiation protocol (SIP, SessionInitiation Protocol) bearer in QCI = 5 bearer, where SIP carries the Session Control Protocol.

For non-real-time IMS services, this service can be directly carried on SIP (QCI=5 bearer).

According to the default value of the current protocol, the enhanced UMTS terrestrial radio access network (E-UTRAN, Evolved universal terrestrial radio access network) uses QCI=5 to carry IMS signaling (IMS signaling), and IMS signaling may carry session initialization protocol and non-real-time Sexual IMS business.

According to the description of the current SRVCC protocol, when the target terrestrial radio access network (UTRAN, Terrestrial Radio Access Network) capability does not support VOIP voice or packet switching (PS, PacketSwitching) switching capability, E-UTRAN initiates only CS domain services SRVCC handover to UTRAN.

When the target UTRAN capability does not support VOIP voice and supports PS HO capability, the source ENODEB indicates "CS+PS" in the SRVCC HO Indication IE, and switches the voice bearer to the CS domain of UTRAN, and switches other bearers except the voice bearer to PS domain of UTRAN.

According to the understanding of the current protocol: in the CS+PS SRVCC handover process, all PS bearers except QCI=1, including the bearer where SIP is located with QCI=5, will be switched to the PS domain of the target UTRAN. The services to be established in the incoming relocation request message received by the RNC include: CS domain voice service; PS domain: common PS service + SIP service.

According to the current SRVCC protocol, as shown in Figure 1: when the voice service is switched from VOIP in the PS domain to voice in the circuit domain, it is not necessary to switch the IMS signaling bearer to UTRAN.

The inventor found in the process of implementing the embodiments of the present invention that the current SRVCC protocol has at least the following problems:

Compared with the UE directly accessing UTRAN to establish CS domain voice, the voice service switched from E-UTRAN to UTRAN through the CS+PS SRVCC handover process always needs to establish an additional SIP service.

With the hot sale of smart phones, the users and traffic of mobile broadband network have increased explosively, which makes the wireless resources of UTRAN network tense. Each CS voice must be accompanied by at least one SIP service. For the UTRAN network with tight radio resources, radio resources are wasted, which may reduce the radio capacity and service throughput of UTRAN.

The SIP service is introduced by the IMS, but some traditional UTRANs do not support the SIP service. When the UTRAN network does not support the SIP service, the UTRAN will return a PS domain service handover failure response, which may cause the CS+PS SRVCC handover process to fail.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a configuration method, switching method and equipment for SRVCC switching, which at least solve the above-mentioned problems that SRVCC switching wastes resources and fails when it is not supported.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for configuring single radio tone call continuity switching, the method comprising:

Configure the UTRAN neighbor cell capability of the target terrestrial radio access network to realize the SRVCC indication of single radio tone call continuity;

The corresponding configuration information includes adding indication information in the capability of the UTRAN neighbor cell; the indication information is the indication information whether the UTRAN neighbor cell supports the session initiation protocol SIP.

A method for switching continuity of a single radiotelephone tone call, the method comprising:

The target terrestrial radio access network UTRAN neighbor cell capability is configured, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initiation protocol SIP;

When initiating a single radio tone call continuity SRVCC handover process, send indication information of whether the UTRAN neighbor cell supports SIP;

After receiving the indication information indicating whether the UTRAN neighbor cell supports SIP, it is decided whether to send the SIP service to the UTRAN for handover.

A method for switching continuity of a single radiotelephone tone call, the method comprising:

The target terrestrial radio access network UTRAN neighbor cell capability is configured, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initiation protocol SIP;

When initiating the single radio tone call continuity SRVCC handover procedure, send the indication information of whether the UTRAN neighbor cell supports SIP.

Wherein, the basis for configuring the capability of the neighbor cell of the target terrestrial radio access network UTRAN specifically includes any of the following:

If the wireless resources of the UTRAN network are tight and exceed the preset value, configure not to switch the bearer corresponding to SIP to UTRAN;

If the IMS system does not deploy non-real-time services or UTRAN does not support IMS non-real-time services, configure not to switch the voice bearer service classification identifier QCI corresponding to SIP to UTRAN;

If the IMS system deploys non-real-time services and expects the continuity of the IMS non-real-time services during the SRVCC handover process, configure to switch the QCI bearer corresponding to SIP to UTRAN.

A method for switching continuity of a single radiotelephone tone call, the method comprising:

Receive the indication information of whether the neighboring cell of the target UTRAN UTRAN supports the session initiation protocol SIP, and decide whether to send the SIP service to the UTRAN according to the indication information of whether the neighboring cell of the UTRAN supports the SIP to perform handover.

Wherein, the decision whether to send the SIP service to the UTRAN according to the indication information of whether the UTRAN neighbor cell supports SIP, specifically includes:

If the SRVCC handover type is only CS ONLY, it will be processed according to the existing CS ONLY process;

If the SRVCC switching type is circuit switching combined with packet switching CS+PS, it is decided whether to switch the SIP service to the UTRAN according to the indication information of whether the UTRAN neighbor cell supports SIP.

A device for switching continuity of a single radiotelephone tone call, the device is located on the E-UTRAN side, comprising:

The configuration unit is used to configure the capability of the UTRAN neighbor cell of the target terrestrial radio access network, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is an indication of whether the UTRAN neighbor cell supports the session initiation protocol SIP information;

The sending unit is configured to send indication information of whether the UTRAN neighbor cell supports SIP to the CN when the SRVCC handover process is initiated.

Wherein, the configuration unit is further used to configure the UTRAN neighboring cell capability according to the following basis:

If the wireless resources of the UTRAN network are tight and exceed the preset value, configure not to switch the bearer corresponding to SIP to UTRAN; or,

If the IMS system does not deploy non-real-time services or UTRAN does not support IMS non-real-time services, configure not to switch the voice bearer service classification identifier QCI corresponding to SIP to UTRAN; or,

If the IMS system deploys non-real-time services and expects the continuity of the IMS non-real-time services during the SRVCC handover process, configure to switch the QCI bearer corresponding to SIP to UTRAN.

A device for switching continuity of a single radiotelephone tone call, the device is located at the CN side, and the device includes:

A receiving unit, configured to receive indication information indicating whether the neighbor cell of the target UTRAN UTRAN supports the session initiation protocol SIP;

The handover decision unit is configured to decide whether to send the SIP service to the UTRAN to perform handover according to the indication information of whether the UTRAN neighbor cell supports SIP.

Wherein, the switching decision unit is further used to process according to the existing CS ONLY process if the SRVCC switching type is CS ONLY only; or, if the SRVCC switching type is circuit switching combined with packet switching CS+PS, then according to The indication information of whether the UTRAN neighbor cell supports SIP decides whether to switch the SIP service to the UTRAN.

Wherein, the receiving unit is specifically a Mobility Management Entity MME in the CN, configured to receive indication information sent by the E-UTRAN whether the UTRAN neighbor cell supports the Session Initiation Protocol SIP;

The handover decision unit is specifically the general packet radio service support node SGSN in the CN, which is used to decide whether the UTRAN neighbor cell supports the session initialization protocol SIP according to the indication information in the intersystem handover request sent by the MME. Switch the SIP service to UTRAN.

Wherein, the SGSN is further used to decide whether to switch the SIP service to the RNC, and request the RNC to allocate PS service-related resources; receive the allocated PS service-related resources, and send a message including the allocated PS service-related resources A relocation response is sent to the MME.

Wherein, both the receiving unit and the handover decision unit are located in the mobility management entity MME in the CN.

The present invention configures the UTRAN neighbor cell capability to realize SRVCC indication; the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initialization protocol SIP. The indication information can provide a decision basis for handover, so as to at least solve the above-mentioned problem that SRVCC handover wastes resources and causes handover failure if it is not supported.

Description of drawings

Figure 1 is an overall high-level schematic diagram of an existing SRVCC handover from E-UTRAN to UTRAN/GERAN;

FIG. 2 is a schematic diagram of the implementation flow of the switching method of the present invention;

Fig. 3 is the SRVCC handover schematic diagram of the present invention from E-UTRAN to the UTRAN of DTM;

FIG. 4 is a schematic diagram of SRVCC switching from E-UTRAN to UTRAN with DTM according to the present invention. Detailed ways

The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

The solution provided by the present invention is to control whether EUTRAN and CN switch the SIP bearer where VOIP accompanying signaling is located to the UTRAN network in the SRVCC handover process. The tension of wireless resources in the network, the deployment of IMS services, and the support of SIP services in the UTRAN network are used to flexibly control the SRVCC strategy, so that operators can use this control method to avoid possible problems caused by the SRVCC handover process to the UTRAN network capacity. In order to avoid wasting resources, and avoid the problem that the SRVCC handover process fails if it is not supported.

The present invention mainly comprises the following contents:

1. From the perspective of the configuration method of SRVCC handover, the method of the present invention provides configuration information configured by the E-UTRAN system for UTRAN, and the configuration information includes adding an indication information to the UTRAN neighbor cell capability to indicate the UTRAN neighbor cell Whether to support SIP.

2. From the perspective of the SRVCC handover method, the method of the present invention provides configuration information configured by the E-UTRAN system for UTRAN, and the configuration information includes adding an indication information to the UTRAN neighbor cell capability to indicate whether the UTRAN neighbor cell Support SIP; when initiating the SRVCC handover process, send the indication information whether the UTRAN neighbor cell supports SIP to the CN; when the CN handles the CS+PS SRVCC handover process, according to whether the UTRAN neighbor cell supports SIP received from the E-UTRAN system The instruction information determines whether to send the SIP service to the UTRAN, specifically, it can send the SIP service to the UTRAN through a relocation request message.

3. From the perspective of the SRVCC handover method, as far as the E-UTRAN system is concerned, the method of the present invention includes: configuring the UTRAN neighbor cell capability, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; The indication information is the indication information of whether the UTRAN neighbor cell supports the Session Initiation Protocol SIP; when the single radio voice call continuity SRVCC handover process is initiated, the indication information of whether the UTRAN neighbor cell supports the SIP is sent.

4. From the perspective of the SRVCC handover method, as far as the CN system side is concerned, the method of the present invention includes: when initiating a single radio tone call continuity SRVCC handover process, after sending the indication information of whether the UTRAN neighbor cell supports SIP , receiving indication information indicating whether the UTRAN neighbor cell supports SIP, and deciding whether to send the SIP service to the UTRAN for handover, specifically, sending it to the UTRAN through a relocation request message.

5. From the perspective of SRVCC handover equipment, as far as the E-UTRAN system is concerned, the equipment of the present invention provides an E-UTRAN system for handover control, and the configuration unit is used to configure the capabilities of UTRAN neighboring cells, and the corresponding configuration information includes Add indication information in the UTRAN neighbor capability; the indication information is the indication information of whether the UTRAN neighbor supports the session initialization protocol SIP; the sending unit is used to send the UTRAN neighbor when the E-UTRAN system initiates the SRVCC handover process Indicates whether to support SIP to the CN.

6. From the perspective of the equipment for SRVCC handover, as far as the CN system is concerned, the equipment of the present invention provides a CN system for handover control. When the CN handles the SRVCC handover process of CS+PS, the receiving unit is used to The UTRAN system receives the indication information whether the UTRAN neighbor cell supports SIP, and decides whether to send the SIP service to the UTRAN, specifically, it can send the SIP service to the UTRAN through a relocation request message.

The process flow of the switching method, as shown in Figure 2, includes the following steps:

Step 11: Configure the capability of the UTRAN neighbor cell, and add indication information in the capability of the UTRAN neighbor cell; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initiation protocol SIP.

Specifically, in the E-UTRAN configuration of the UTRAN neighboring cell capability, an indication of whether the UTRAN neighboring cell supports SIP is added; the value of the indication is a BOOL variable.

Step 12: When initiating a SRVCC handover procedure for single radio tone call continuity, send indication information whether the UTRAN neighbor cell supports SIP.

Specifically, when the E-UTRAN receives the UE measurement report and decides to initiate the SRVCC handover to the UTRAN, it transmits the indication information of whether the neighboring cell of the UTRAN supports SIP to the CN.

Step 13: Receive the indication information whether the UTRAN neighbor cell supports SIP, and decide whether to send the SIP service to the UTRAN for handover.

Specifically, after the CN receives the above information, if the SRVCC switching type is CS ONLY, it will be processed according to the existing CS ONLY process; otherwise, if the SRVCC switching type is CS+PS, it will be determined according to the indication information whether the UTRAN neighbor cell supports SIP Whether to switch the SIP service to UTRAN.

The rest of the steps are handled in the same way as the existing SRVCC process, and will not be described in detail, and a complete description of the embodiment will follow.

The functions that the system can realize are the same as those described in the flow of the method here, and will not be repeated here. However, it should be pointed out that: from the perspective of the equipment handed over by SRVCC, and the equipment is located on the side of the E-UTRAN system, the equipment provides the E-UTRAN system for handover control, and the E-UTRAN system belongs to the side of the wireless network Hardware entity: From the perspective of SRVCC switching equipment, and when the equipment is located on the side of the CN system, the equipment of the present invention provides a CN system for switching control, and the CN system belongs to the hardware entity on the core network side.

The main hardware entities included in the CN system are: Mobility Management Entity (MME), which is mainly used to realize the signaling processing function of CN; GPRS Service Support Node (SGSN), that is, the General Packet Radio Service Support Node, which is mainly used to realize CN It mainly completes the routing and forwarding of packet data packets, mobility management, session management, logical link management, authentication and encryption, bill generation and output and other functions. The service gateway (S-GW) is mainly used to realize the data processing function of the CN.

The beneficial effect of adopting the scheme of the present invention is:

The operator can flexibly control whether the SIP bearer in the E-UTRAN network is switched to the UTRAN, thereby saving the radio resources of the UTRAN network; and can improve the success rate of the switching of the SRVCC process.

Regarding the flexible control, specifically, if the radio resources of the UTRAN network are insufficient, the operator may configure not to switch the bearer corresponding to the SIP to the UTRAN.

For the flexible control, specifically, if the IMS system does not deploy non-real-time services or UTRAN does not support IMS non-real-time services, the operator may configure not to switch the QCI bearer corresponding to SIP to UTRAN.

For the flexible control, specifically, if the IMS system deploys non-real-time services and the operator also wants the IMS non-real-time services to maintain continuity during the SRVCC handover process, the operator can configure the QCI bearer corresponding to SIP to be switched to UTRAN.

With regard to saving the wireless resources of the UTRAN network, specifically, the SRVCC process from the EUTAN to the UTRAN can be avoided from wasting the wireless resources of the UTRAN, and the impact on its wireless service throughput and wireless service capacity can be avoided.

For improving the handover success rate of the SRVCC process, specifically, the handover success rate of the SRVCC process handed over from EUTRAN to UTRAN can be improved.

The following describes the present invention with specific examples, taking the SRVCC process of switching from E-UTRAN to UTRAN as an example, but the implementation of the present invention is not limited to this specific scene.

Example 1:

When EUTRAN instructs MME to initiate the CS+PS SRVCC handover process, EUTRAN will also give the MME an indication of whether the UTRAN neighbor cell supports SIP, and MME will decide whether to request SGSN to hand over SIP services to RNC. The specific process is shown in Figure 3 display, including:

In step 101, an indication of whether the UTRAN neighbor cell supports SIP is added to the capability of the UTRAN neighbor cell on the EUTRAN side; the UE accesses the EUTRAN system and establishes an IMS voice service.

In the UTRAN neighboring cell capability on the EUTRAN side, on the basis of the existing indication of whether to support VOIP and whether to support PS handover, an indication of whether the UTRAN neighboring cell supports SIP is added.

After the UE initiates the IMS voice service, its bearers are: QCI=1 (IMS voice bearer), QCI=5 (SIP bearer), QCI=N (N is the default bearer, depending on the configuration);

If the UE initiates other PS services, it may also be accompanied by other QCI=M

In step 102, the UE moves to a 3G neighboring cell, and reports a measurement report to trigger a handover to the UTRAN system.

Step 103, EUTRAN sends Handover Required to the source MME, wherein the SRVCC HOindication indicates the SRVCC handover type of CS+PS, and at the same time, the source EUTRAN also sends an indication of whether the UTRAN neighbor cell supports SIP to the MME.

Step 104, the MME separates the voice bearer and the non-voice PS bearer from the PS bearer, and initiates an outgoing inter-system handover request to the MSC SERVER and the SGSN respectively.

Step 105a, MME initiates a PS-CS voice handover request of SRVCC to MSC SERVER, and marks whether it is an emergency call. And obtain the security key of the CS service;

Step 105b, MSC SERVER forwards the PS-CS voice switching request of SRVCC to the target MSC;

In step 105c, the target MSC sends a CS service incoming inter-system handover request to the target RNC, requesting to allocate CS service-related resources.

Steps 106a-107b, if there is concurrent inter-system handover of non-voice PS services, the source MME initiates a PS service inter-system handover request to the target SGSN, and the target SGSN sends a PS service incoming inter-system handover request to the target RNC, requesting to allocate PS services For related resources, the target RNC returns the PS resource allocation result to the SGSN/MME;

If the indication of whether the UTRAN neighbor cell supports SIP is TRUE, the source MME sends to the target SGSN an indication that the services that need to be handed over to the RNC include all bearer services except voice bearers: that is, services on all bearers except QCI=1, include:

QCI=5 (SIP bearer), SGSN indicates SIP service in the incoming relocation request message sent to RNC;

QCI=N (N is the default bearer, and N depends on the configuration), the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

QCI=M (M is the bearer corresponding to the data service initiated by the UE), and the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

The RNC needs to allocate radio resources for the above-mentioned SIP service and other common PS services.

If the indication of whether the UTRAN neighbor cell supports SIP is FALSE, the source MME sends the target SGSN an indication that the services that need to be handed over to the RNC include all bearer services except voice bearer and SIP: that is, except QCI=1 and QCI=5 All bearers, including:

QCI=N (N is the default bearer, and N depends on the configuration), the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

QCI=M (M is the bearer corresponding to the data service initiated by the UE), and the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

The RNC needs to allocate radio resources for the above-mentioned common PS services.

Step 108a, the target RNC informs the target MSC of the CS resource allocation result (in the form of Target to Source Transparent Container) through the RELOCAITON REQUEST ACK message;

Step 108b, target MSC sends Prepare Handover Response (including Target to SourceTransparent Container) to MSC SERVER;

In step 108c, a CS domain link is directly established between the MGW related to the MSC SERVER and the target MSC.

Note: If it is an intersystem handover between CS and PS, it is similar to DTM handover. The Target to Source Transparent Container returned by the target RNC to the SGSN in 7a and the Target to Source Transparent Container returned by the target RNC to the target MSC in 8a are the same, both contain CS and PS business information.

Step 109, the MSC SERVER initiates a session conversion process to the IMS.

Step 110, the session switching process makes the VOIP packet switch to CS access.

Step 111, the original IMS access is released.

Step 112, MSC SERVER sends the PS-CS voice switching response of SRVCC to MME.

Step 113, MME collects the PS-CS voice handover response and PS handover response (if any) of SRVCC, and sends Handover Command (including Target to Source Transparent Container) to E-UTRAN.

Step 114, the E-UTRAN sends the handover command to the UE.

Step 115, the UE switches to the UTRAN system.

Step 116, handover detection process processing. UE sends Handover Complete to MSC SERVER (via target RNC/target MSC).

Step 117, the voice switching is completed. The target RNC sends Relocation Complete to MSCSERVER (through the target MSC), and MSC SERVER completes the establishment of the circuit domain voice and sends SRVCC PS to CS Complete Notification to MME.

Step 118, the concurrent PS handover process is completed. If there is a concurrent PS handover process, the target RNC sends Relocation Complete to the target SGSN, and the target SGSN transparently transmits this message to the MME; if there is an SRVCC PS-CS voice handover process, the SGSN needs to modify the session that has been handed over to the CS domain .

Step 119, if it is an emergency call, the source MME or MSC SERVER needs to send a SubscriberLocation Report message to the GMLC to support location continuity.

Example 2:

When EUTRAN instructs MME to initiate the CS+PS SRVCC handover process, EUTRAN will also give the MME an indication of whether the UTRAN neighbor cell supports SIP, and MME will decide whether to request SGSN to handover SIP service to RNC. The specific process is shown in Figure 4 display, including:

Step 211 , adding an indication of whether the UTRAN neighbor cell supports SIP to the UTRAN neighbor cell capability on the EUTRAN side; the UE accesses the EUTRAN system and establishes an IMS voice service.

In the UTRAN neighboring cell capability on the EUTRAN side, on the basis of the existing indication of whether to support VOIP and whether to support PS handover, an indication of whether the UTRAN neighboring cell supports SIP is added.

After the UE initiates the IMS voice service, its bearers are: QCI=1 (IMS voice bearer), QCI=5 (SIP bearer), QCI=N (N is the default bearer, depending on the configuration);

If the UE initiates other PS services, it may also be accompanied by other QCI=M

In step 212, the UE moves to a 3G neighboring cell, and reports a measurement report to trigger a handover to the UTRAN system.

Step 213, EUTRAN sends Handover Required to the source MME, wherein the SRVCC HOindication indicates the SRVCC handover type of CS+PS, and at the same time, the source EUTRAN also sends an indication of whether the UTRAN neighbor cell supports SIP to the MME.

Step 214, the MME separates the voice bearer and the non-voice PS bearer from the PS bearer, and initiates an outgoing inter-system handover request to the MSC SERVER and the SGSN respectively.

Step 215a, MME initiates a PS-CS voice handover request of SRVCC to MSC SERVER, and a flag of whether it is an emergency call. And obtain the security key of the CS service;

Step 215b, MSC SERVER forwards the PS-CS voice switching request of SRVCC to the target MSC;

In step 215c, the target MSC sends a CS service incoming inter-system handover request to the target RNC, requesting to allocate CS service-related resources.

Steps 216a-217b, if there is concurrent non-voice PS service inter-system handover, the source MME initiates a PS service inter-system handover request to the target SGSN, and at the same time sends an indication of whether the UTRAN neighbor cell supports SIP to the target SGSN. The target SGSN sends a PS service incoming inter-system handover request to the target RNC, requesting to allocate resources related to the PS service, and the target RNC returns the PS resource allocation result to the SGSN/MME.

If the indication of whether the UTRAN neighbor cell supports SIP is TRUE, the incoming relocation request message sent by the target SGSN to the RNC indicates that the services that need to be handed over to the RNC include all bearer services except the voice bearer: that is, all bearer services except QCI=1 All bearer services, including:

QCI=5 (SIP bearer), the target SGSN indicates the SIP service in the incoming relocation request message sent to the RNC;

QCI=N (N is the default bearer, and N depends on the configuration), the target SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, and there is no special indication.

QCI=M (M is the bearer corresponding to the data service initiated by the UE), and the target SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

The RNC needs to allocate radio resources for the above-mentioned SIP service and other common PS services.

If the indication of whether the UTRAN neighbor cell supports SIP is FALSE, the target SGSN indicates that the services that need to be handed over to the RNC include all bearer services except voice bearer and SIP: that is, all bearers except QCI=1 and QCI=5, including :

QCI=N (N is the default bearer, and N depends on the configuration), the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

QCI=M (M is the bearer corresponding to the data service initiated by the UE), and the SGSN indicates the general PS service in the incoming relocation request message sent to the RNC, without special instructions.

The RNC needs to allocate radio resources for the above-mentioned common PS services.

Step 218a, the target RNC informs the target MSC of the CS resource allocation result (in the form of Target to Source Transparent Container) through the RELOCAITON REQUEST ACK message;

Step 218b, target MSC sends Prepare Handover Response (including Target to SourceTransparent Container) to MSC SERVER;

In step 218c, a CS domain link is directly established between the MGW related to the MSC SERVER and the target MSC.

Note: If it is an intersystem handover between CS and PS, it is similar to DTM handover. The Target to Source Transparent Container returned by the target RNC to the SGSN in 7a and the Target to Source Transparent Container returned by the target RNC to the target MSC in 8a are the same, both contain CS and PS business information.

Step 219, the MSC SERVER initiates a session conversion process to the IMS.

Step 220, the session switching process makes the VOIP packet switch to CS access.

Step 221, the original IMS access is released.

Step 222, MSC SERVER sends the PS-CS voice switching response of SRVCC to MME.

Step 223, MME receives all PS-CS voice handover responses and PS handover responses (if any) from SRVCC, and sends Handover Command (including Target to Source Transparent Container) to E-UTRAN.

Step 224, the E-UTRAN sends the handover command to the UE.

Step 225, the UE switches to the UTRAN system.

Step 226, Handover detection process processing. UE sends Handover Complete to MSC SERVER (via target RNC/target MSC).

Step 227, the voice switching is completed. The target RNC sends Relocation Complete to MSCSERVER (through the target MSC), and MSC SERVER completes the establishment of the circuit domain voice and sends SRVCC PS to CS Complete Notification to MME.

Step 228, the concurrent PS handover process is completed. If there is a concurrent PS handover process, the target RNC sends Relocation Complete to the target SGSN, and the target SGSN transparently transmits this message to the MME; if there is an SRVCC PS-CS voice handover process, the SGSN needs to modify the session that has been handed over to the CS domain .

Step 229, if it is an emergency call, the source MME or MSC SERVER needs to send a SubscriberLocation Report message to the GMLC to support location continuity.

For the convenience of description, the QCI configuration cited in the above example adopts the default value of the protocol, that is: QCI=5 bears IMS signaling; it is also assumed that the default bearer is not QCI=5.

If the QCI of carrying IMS signaling in the actual configuration is other values, or the default carrying is also QCI=5, it will not affect the application effect of the present invention.

The embodiment of the present invention takes the example of the SRVCC handover from EUTRAN to UTRAN, and the idea is also applicable to the SRVCC handover process from ETURAN to GERAN.

If the integrated modules described in the embodiments of the present invention are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for Make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. . Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (13)

1. A configuration method for single radio tone call continuity handover, characterized in that the method comprises: Configure the UTRAN neighbor cell capability of the target terrestrial radio access network to realize the SRVCC indication of single radio tone call continuity; The corresponding configuration information includes adding indication information in the capability of the UTRAN neighbor cell; the indication information is the indication information whether the UTRAN neighbor cell supports the session initiation protocol SIP. 2. A method for single radio tone call continuity switching, characterized in that the method comprises: The target terrestrial radio access network UTRAN neighbor cell capability is configured, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initiation protocol SIP; When initiating a single radio tone call continuity SRVCC handover process, send indication information of whether the UTRAN neighbor cell supports SIP; After receiving the indication information indicating whether the UTRAN neighbor cell supports SIP, it is decided whether to send the SIP service to the UTRAN for handover. 3. A method for single radio tone call continuity switching, characterized in that the method comprises: The target terrestrial radio access network UTRAN neighbor cell capability is configured, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is the indication information of whether the UTRAN neighbor cell supports the session initiation protocol SIP; When initiating the single radio tone call continuity SRVCC handover procedure, send the indication information of whether the UTRAN neighbor cell supports SIP. 4. The method according to claim 3, wherein the basis for configuring the capability of the neighbor area of the target terrestrial radio access network UTRAN specifically includes any of the following: If the wireless resources of the UTRAN network are tight and exceed the preset value, configure not to switch the bearer corresponding to SIP to UTRAN; If the IMS system does not deploy non-real-time services or UTRAN does not support IMS non-real-time services, configure not to switch the voice bearer service classification identifier QCI corresponding to SIP to UTRAN; If the IMS system deploys non-real-time services and expects the continuity of the IMS non-real-time services during the SRVCC handover process, configure to switch the QCI bearer corresponding to SIP to UTRAN. 5. A method for switching over continuity of a single radio tone call, characterized in that the method comprises: Receive the indication information of whether the neighboring cell of the target UTRAN UTRAN supports the session initiation protocol SIP, and decide whether to send the SIP service to the UTRAN according to the indication information of whether the neighboring cell of the UTRAN supports the SIP to perform handover. 6. The method according to claim 5, wherein the decision whether to send the SIP service to the UTRAN to perform handover according to the indication information of whether the UTRAN neighbor cell supports SIP, specifically includes: If the SRVCC handover type is only CS ONLY, it will be processed according to the existing CS ONLY process; If the SRVCC switching type is circuit switching combined with packet switching CS+PS, it is decided whether to switch the SIP service to the UTRAN according to the indication information of whether the UTRAN neighbor cell supports SIP. 7. A device for single radio tone call continuity switching, characterized in that the device is located at the E-UTRAN side, comprising: The configuration unit is used to configure the capability of the UTRAN neighbor cell of the target terrestrial radio access network, and the corresponding configuration information includes adding indication information in the UTRAN neighbor cell capability; the indication information is an indication of whether the UTRAN neighbor cell supports the session initiation protocol SIP information; The sending unit is configured to send indication information of whether the UTRAN neighbor cell supports SIP to the CN when the SRVCC handover procedure is initiated. 8. The device according to claim 7, wherein the configuration unit is further configured to configure the UTRAN neighbor cell capability according to the following: If the wireless resources of the UTRAN network are tight and exceed the preset value, configure not to switch the bearer corresponding to SIP to UTRAN; or, If the IMS system does not deploy non-real-time services or UTRAN does not support IMS non-real-time services, configure not to switch the voice bearer service classification identifier QCI corresponding to SIP to UTRAN; or, If the IMS system deploys non-real-time services and expects the continuity of the IMS non-real-time services during the SRVCC handover process, configure to switch the QCI bearer corresponding to SIP to UTRAN. 9. A device for switching continuity of a single radiotelephone tone call, characterized in that the device is located at the CN side, and the device includes: A receiving unit, configured to receive indication information indicating whether the neighbor cell of the target UTRAN UTRAN supports the session initiation protocol SIP; The handover decision unit is configured to decide whether to send the SIP service to the UTRAN to perform handover according to the indication information of whether the UTRAN neighbor cell supports SIP. 10. The device according to claim 9, wherein the switching decision unit is further configured to process according to an existing CS ONLY process if the SRVCC switching type is only CS ONLY; or, if the SRVCC switching If the type is circuit switching combined with packet switching CS+PS, it is decided whether to switch the SIP service to the UTRAN according to the indication information of whether the UTRAN neighbor cell supports SIP. 11. The device according to claim 9 or 10, wherein the receiving unit is specifically a Mobility Management Entity (MME) in the CN, and is configured to receive information sent by E-UTRAN whether the UTRAN neighbor cell supports session Instruction information of the initialization protocol SIP; The handover decision unit is specifically the general packet radio service support node SGSN in the CN, which is used to decide whether the UTRAN neighbor cell supports the session initialization protocol SIP according to the indication information in the intersystem handover request sent by the MME. Switch the SIP service to UTRAN. 12. The device according to claim 11, wherein the SGSN is further used to decide whether to switch the SIP service to the RNC, and request the RNC to allocate PS service-related resources; receive the allocated PS service-related resources resources, and send a relocation response including the allocated PS service-related resources to the MME. 13. The device according to claim 9 or 10, wherein both the receiving unit and the handover decision unit are located in a Mobility Management Entity (MME) in the CN.