CN102448036B

CN102448036B - A kind of method and apparatus realizing the continuous voice call of injection frequency subscriber equipment

Info

Publication number: CN102448036B
Application number: CN201010535402.3A
Authority: CN
Inventors: 衣强; 段小嫣; 金辉
Original assignee: Huawei Device Co Ltd
Current assignee: Huawei Device Co Ltd; Huawei Device Shenzhen Co Ltd
Priority date: 2010-09-30
Filing date: 2010-11-08
Publication date: 2015-08-19
Anticipated expiration: 2030-11-08
Also published as: CN102448036A

Abstract

The embodiment provides a kind of method and apparatus realizing the continuous voice call of injection frequency subscriber equipment, relate to communication technical field, for ensureing that normally carrying out of priority session is invented.The method of the continuous voice call of described injection frequency subscriber equipment comprises: receive handover request message; According to the SRVCC indication message that described handover request message is carried, detect the precedence information of voice bearer, and the voice bearer the highest to priority level is separated; Transmission packet switched ps domain is asked to the SRVCC of circuit-switched CS domain, and in this SRVCC asks, carries the precedence information of the voice bearer of separation, to make CS territory entity according to described precedence information priority allocation CS territory resource.

Description

A kind of method and apparatus realizing the continuous voice call of injection frequency subscriber equipment

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method and apparatus realizing the continuous voice call of injection frequency subscriber equipment.

Background technology

Multimedia priority service MPS (Multimedia Priortiy Server) can provide the conversational services of priority for user, and network side entity can according to the priority of session, this session request of priority treatment and be preferably this session Resources allocation; When in network congestion cannot be session Resources allocation, network side can be other according to session priority, selects lower priority session the release of its resource to be used for the session that priority is high; Or situation about waiting in line due to the needs that cause of Internet resources deficiency, when there being available resources, according to the priority of session, first be the wait session Resources allocation grown priority high and stand-by period.That is, network side priority treatment can be made to contract the user of priority service, realize the normal delivery of key message.

In prior art, the a certain moment can only be connected to the user equipment (UE) (UE of a radio frequency, User Equipment) terminal, i.e. injection UE terminal frequently, when carrying out by PS territory (circuit commutative field, Packet Switched Domain, packet-switched domain) to CS territory (Circuit SwitchedDomain, circuit commutative field) when switching (or transfer), need the continuity keeping voice conversation, the handoff procedure of the network domains of this maintenance conversation continuity, be called SRVCC (SingleRadio Voice Call Continuity, the continuous voice call of injection frequency UE) process.

Existing SRVCC process according to the session of transfer required for session status and state of activation or hold mode selection, after Session Hand-off, will discharge the session be not switched usually.Therefore, when carrying out SRVCC process, the priority session of UE is not likely switched and is released, and then causes the transmission of the key message of priority session to be interrupted.

Summary of the invention

Embodiments of the invention provide a kind of method and apparatus realizing SRVCC, can ensure normally carrying out of priority session.

For achieving the above object, embodiments of the invention adopt following technical scheme:

Realize a method of SRVCC, comprising:

Receive handover request message (Handover Required Message);

Obtain the precedence information of the highest voice bearer of priority level;

Send the handover request message of PS territory to CS territory, and in this handover request message, carry described precedence information, to make entity priority allocation CS territory, CS territory resource.

Realize a method of SRVCC, it is characterized in that, comprising:

Receive PS territory to the handover request message in CS territory, in described handover request message, carry precedence information;

Send preparation handover request message to target mobile switching centre, in this preparation handover request message, carry described the priority level information;

Session transfer request message is sent to SCC AS.

Realize a method of SRVCC, it is characterized in that, comprising:

User equipment (UE) is adjusted to CS territory by PS territory;

When described UE judges self to have one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

A kind of mobile management entity (Mobility Management Entity, MME), comprising:

Receiving element, for receiving handover request message;

Acquiring unit, for obtaining the precedence information of the highest voice bearer of priority level;

Transmitting element, for sending the handover request message of PS territory to CS territory, and carries described precedence information in this handover request message, to make entity priority allocation CS territory, CS territory resource.

A kind of UE, is characterized in that, comprising:

Adjustment unit, for being adjusted to CS territory by PS territory;

Buanch unit, for when judging self to have one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

After adopting technique scheme, the method and apparatus of what the embodiment of the present invention provided realize SRVCC, when there is priority dialogue and need to carry out PS territory to the SRVCC process in CS territory in UE, the switching that can conversate according to the priority level of session, the session that preferential transfer priority level is the highest, effectively ensures normally carrying out of priority session.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The flow chart realizing the method for SRVCC that Fig. 1 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Fig. 2 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Fig. 3 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Fig. 4 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Fig. 5 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Fig. 6 provides for the embodiment of the present invention;

The structured flowchart of the MME that Fig. 7 provides for the embodiment of the present invention;

The structured flowchart of the CS territory entity that Fig. 8 provides for the embodiment of the present invention;

The structured flowchart of the SCC AS that Fig. 9 provides for the embodiment of the present invention;

Figure 10 is the another kind of structured flowchart of the SCC AS shown in Fig. 9;

Figure 11 is the another kind of structured flowchart of the SCC AS shown in Fig. 9;

Figure 12 is the another kind of structured flowchart of the SCC AS shown in Fig. 9;

The structured flowchart of the UE that Figure 13 provides for the embodiment of the present invention;

The another kind of structured flowchart that Figure 14 is the UE shown in Figure 13;

The another kind of structured flowchart that Figure 15 is the UE shown in Figure 13;

The another kind of structured flowchart that Figure 16 is the UE shown in Figure 13;

The another kind of flow chart of the method for SRVCC that realizes that Figure 17 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Figure 18 provides for the embodiment of the present invention;

The another kind of flow chart of the method for SRVCC that realizes that Figure 19 provides for the embodiment of the present invention;

The another kind of structured flowchart of the MME that Figure 20 provides for the embodiment of the present invention;

The another kind of structured flowchart of the MSC server that Figure 21 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

As shown in Figure 1, a kind of method realizing SRVCC that the embodiment of the present invention provides, based on the MME (Mobility Management Entity, mobile management entity) of PS domain network side, comprising:

S11, receives handover request message;

When the base station eNodeB belonging to UE detects that UE needs to perform PS territory to the SRVCC process in CS territory, by the MME transmission handover request message to PS territory, in this handover request message, carry SRVCC indication message.

S12, according to the SRVCC indication message that described handover request message is carried, detect the precedence information of voice bearer, and the voice bearer the highest to priority level is separated;

After MME receives handover request, the separation of voice bearer will be carried out.First MME detects the precedence information of voice bearer, concrete, MME is by ARP (the Allocationand Retention Priority of carrying, Resourse Distribute and keep priority) precedence information of parameter detecting voice bearer, and judge the priority level of voice bearer respective session, select the highest session of priority to carry out the separation of voice bearer.

S13, transmission PS territory is asked to the SRVCC in CS territory, and in this SRVCC asks, carries the precedence information of the voice bearer of separation, to make CS territory entity according to described precedence information priority allocation CS territory resource.

Wherein, CS territory entity includes but not limited to MSC Server (Mobile SwitchingCenter Server, Mobile Switching Center Server), MGW (Media GataWay, media gateway) and BSS (Base Station Subsystem, base station sub-system module).

MME sends the SRVCC request of carrying precedence information to target CS territory network, target CS territory entity can be made to know that this handoff procedure comprises the switching of priority session, and can be to be switched session priority allocation resource according to the precedence information in SRVCC request, to set up the carrying of CS territory, ensure normally carrying out of priority session.

Concrete, in SRVCC request, the precedence information that carries can comprise three partial contents, is respectively: whether whether the priority level of the voice bearer of separation, the voice bearer of this separation resource corresponding to the voice bearer that is separated with this of the instruction of preempting resources can allow the instruction that is preempted.In addition, the instruction whether allowed request queue can also be comprised in precedence information.The particular content of precedence information can be arranged according to the actual conditions such as system configuration and carrier policy.

In this step, on the basis that MME can ask at existing SRVCC, in SRVCC request, carried the precedence information of session by two kinds of modes, specific as follows:

One, utilizes Sv flag parameter.

Sv flag is the parameter that existing SRVCC asks to comprise, and comprises some bytes, from the 6th byte, is the reserved place of this parameter, can specifies its implication, and therefore, MME by the reserved place of Sv flag, can carry the priority level information.Such as, MME expands the 6th of Sv flag the byte, specify this byte representation the priority level information, after expansion, the form of this byte can be as shown in Table 1, wherein the 3 to 6 bit is used for representing the priority level (Priority Level) of voice bearer be separated, and the 7th bit is used for representing PCI (PreemptionCapability Indicator), and namely whether this voice bearer can preempting resources instruction; 1st bit is used for representing PVI (Preemption Vulnerability Indicator), whether the resource that namely this voice bearer is corresponding allows to be preempted instruction, whether QA refers to Queuing Allowed Indicator, namely allow the instruction of request queue.Certainly, also can there is other extended mode, not limit here.

Table one:

Its two, utilize special STN-SR (Session Transfer Number-Single Radio, injection Session Hand-off number frequently).

STN-SR belongs to a part for subscription data, MME at UE attaching process from HSS (Home Subscriber Server, local subscribed services device) obtain the privately owned identity information of STN-SR and UE, and made an addition in the SRVCC request in PS to CS territory, to make IMS (Internet Protocol multimedia subsystem, network interconnection protocol multi-media sub-system) SCC AS (the Service Centralization And Continuity Application Server of layer, service set and continuous server) can know that this request is the SRVCC handoff procedure in PS to CS territory according to STN-SR.A few for STN-SR position according to carrying separation process, after knowing the loading priority of session to be transferred, can be set to the parameters such as Priority Level, PVI and PCI by MME.If do not have priority service, then corresponding position remains unchanged.

As shown in Figure 2, a kind of method realizing SRVCC that the embodiment of the present invention provides, based target CS territory entity, comprising:

S21, reception PS territory is asked to the SRVCC in CS territory, and this SRVCC carries precedence information in asking.

The SRVCC request that the MME that CS territory entity receives PS territory sends, according to the SRVCC request received, CS territory entity will know that this handoff procedure comprises the switching of priority session, the precedence information that CS territory entity receives can comprise three partial contents, is respectively: whether whether the priority level of voice bearer that MME is separated, this voice bearer the instruction of preempting resources and resource corresponding to this voice bearer can allow the instruction that is preempted.In addition, the instruction whether allowed request queue can also be comprised in precedence information.The particular content of precedence information can be arranged according to the actual conditions such as system configuration and carrier policy.

S22, according to the described precedence information in described SRVCC request, priority allocation CS territory resource.

CS territory entity is according to described precedence information, when CS territory request dispatching resource, carry the precedence information received, instruction CS territory entity is preferably this handoff procedure and distributes corresponding radio frequency resource and bearing resource, therefore, it is possible to ensure normally carrying out of priority session.Concrete, when eMLLPP (Enhanced Multi-Level Precedence AndPre-Emption Service is supported in CS territory, preferential and the resource strengthened seizes business business in advance) time, the described SRVCC received asks the precedence information carried to be converted into precedence information corresponding to eMLPP business by CS territory entity, during to CS territory request dispatching resource, carry the precedence information that described eMLPP business is corresponding.

S23, sends session transfer request to SCC AS.

In SRVCC process, need carry out IMS (IP Multimedia Subsystem, IP multimedia subsystem) layer handoff procedure, therefore, CS territory entity also will initiate the Session Hand-off of IMS layer, sends session transfer request to SCC AS.

Concrete, this session transfer request can carry precedence information, wherein, this precedence information can be identical with the precedence information received by the entity of CS territory, also can be the priorities associated information different from the precedence information received by the entity of CS territory, such as, only comprise priority level, or only comprise the precedence information of the instruction of priority Session Hand-off, the precedence information that SCC AS can carry according to session transfer request knows that this Session Hand-off process comprises the transfer process of priority session, and the precedence information that the priority level of session to be transferred etc. is correlated with can be known.

It is pointed out that between S22 and S23 step, order can not be fixing, both can carry out simultaneously, and also can carry out successively, those skilled in the art can suitably adjust this as required, and the present embodiment does not limit this.

As shown in Figure 3, a kind of method realizing SRVCC that the embodiment of the present invention provides, based on the SCC AS of IMS layer, comprising:

S31, receives the session transfer request that mobile switching center server MSC Server sends;

Wherein, this session transfer request can carry precedence information, like this, SCC AS can according to the precedence information received, know that this Session Hand-off process comprises the transfer process of priority session, and, SCC AS can also according to the precedence information received, know the relevant precedence information of session to be transferred, and the former session priority information of this precedence information and self being preserved contrasts, when both are different, SCC AS is in the process upgrading opposite end, carry new precedence information, make the Qos parameter that opposite end carries by new priority update.

S32, when judging that user equipment (UE) corresponding to described session transfer request has one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

SCC AS self stores the session related information of UE corresponding to described session transfer request, and therefore, SCC AS can according to the relevant information of described session, determines that UE corresponding to described session transfer request has one or more priority session.

The method realizing SRVCC of the present embodiment, the transfer that SCC AS can conversate according to the priority level of session, namely preferentially can shift the high session of priority, ensures normally carrying out of priority session.

MSC Server assisted mid-call characteristic is a kind of network configuration, when UE and network entity (MSC Server, SCC AS) all support MSC Server assisted mid-call characteristic, SRVCC process can shift at most two sessions in multiple session, and when UE or network entity do not support MSC Server assisted mid-call characteristic, SRVCC process, UE and SCC AS only can shift a session.In prior art, SCC AS can know whether UE corresponding to self and handover request supports MSC Server assisted mid-call characteristic.Therefore, in the priority level according to session, before the session the highest to priority is preferentially shifted, the method for the present embodiment, also can comprise:

Determine whether UE corresponding to self and received session transfer request supports MSCServer assisted mid-cal characteristic, to determine the session number carrying out shifting.

Concrete, in S32 step, SCC AS is according to the priority level of session, and the principle that the session the highest to priority is preferentially shifted specifically can comprise:

One, UE or network entity do not support MSC Server assisted mid-call characteristic

SCC AS only can shift a session, and SCC AS selects the highest session of priority to shift, and state session of selecting under equal priority to be activated recently shifts, and as not having state of activation session, then selects nearest held state session to shift.

After Session Hand-off, by other sessions release except the highest session of described priority.

Two, UE and network entity support that MSC Server assisted mid-call characteristic can comprise:

If only have a priority session in multiple sessions of 1 UE, then preferentially shift this priority session.If this priority session is state of activation, then other sessions of the state that is activated recently are selected to shift again, if when not having state of activation session, select the session of nearest held state.If this priority session is hold mode, the hold mode of this priority session is kept after transfer, and investigate whether also have state of activation session, if had, state session of then selecting to be activated recently shifts, and keep the state of activation of this session, if there is no state of activation session, then only shift this priority session.

After Session Hand-off, by other sessions release except priority session and selected second session to be transferred.

2, if there is multiple priority session in UE, then select the highest and secondary two the high sessions of priority to shift, the session that first transfer priority is the highest.

When two sessions that shifted priority is the highest are all in state of activation, priority time high session is set to hold mode and shifts by SCC AS.

When shifted limit priority session is in hold mode, when secondary high priority session is in state of activation, then keep the hold mode of limit priority session and the state of activation of time high priority session after transfer.

When shifted limit priority and time high priority session are all in hold mode, then preferentially shift the high hold mode session of priority, keep the hold mode of this session, and investigate in UE whether also have state of activation session, select the highest state of activation session of priority to shift.If there is no the session of state of activation priority, then select the normal state session be activated recently to shift, and keep the state of activation of state of activation session.If there is no state of activation session, then the hold mode priority session only selected by transfer

When selecting between multiple equal priority session, SCC AS selects the state that is activated recently and/or held state session recently to shift, and state of activation session is preferentially shifted relative to hold mode session.

It should be noted that the priority level of SCC AS according to session, the principle preferentially shifted according to the session that priority is the highest conversate transfer principle be not limited to mentioned above principle, can configure according to the actual conditions such as system configuration and carrier policy.And above branch philosophy is not limited to the SRVCC process of injection frequently UE, transfer process between the PS territory that can also be applicable to Double RF UE to CS territory.

In addition, when second session to be transferred in a transfer process is priority session, SCC AS can send the precedence information of described second session to be transferred to MSC Server, so that MSC Server is for providing the precedence information of this session when described second Session Hand-off to be transferred goes back to PS territory.Concrete, precedence information can carry and send to MSC Server by SCC AS in SIP (SessionInitiation Protocol, the conversation initialized protocol) message header of message or the message body of sip message, MSC Server preserves this information, provides the precedence information of session for being transferred back to PS territory.

Further, the present embodiment realizes the method for SRVCC, also can comprise before S32 step:

Determine self to support priority service;

According to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine that UE corresponding to described session transfer request supports priority service.

SCC AS passes through above-mentioned steps, first can determine whether UE corresponding to self and described session transfer request supports priority service, when the UE that SCC AS self is corresponding with described session transfer request all supports priority service, SCC AS to conversate transfer according to the principle that the session that priority is high is preferentially shifted, otherwise, can mode conventionally to conversate transfer.

In the session establishment process of UE, when UE is caller, if UE self supports priority service, the instruction that mark UE supports priority service can be carried in session establishment request message, such as, can carry g.3gpp.priority at the contact header field of session establishment request message.When UE is called, if UE supports priority service, and in the session establishment request message received, carry the indication information that SCC AS supports priority service, UE can carry the information that mark UE supports priority service in the reply message of session establishment request, such as, can carry g.3gpp.priority at the contact header field of replying message.Namely UE can carry the instruction that UE supports priority obligation in the reply message of the session establishment request or session establishment request that send to SCC AS, so, the instruction that whether SCC AS just can carry the support priority service of UE according to the reply message of the session establishment request message received in session establishment process or session establishment request determines whether UE supports priority service.

In like manner, when the SRVCC conversated when UE side switches, can need equally to know whether corresponding SCC AS supports priority service, therefore, know that in order to make UE SCC AS supports priority service, the present embodiment realizes the method for SRVCC, before S32 step, also can comprise:

Determine self to support priority service;

Send the reply message of session establishment request or session establishment request, the instruction that self supports priority service is carried in the reply message of described session establishment request or session establishment request, UE corresponding to described session transfer request receives session establishment request, or after the reply message of session establishment request, according to the reply message of described session establishment request or session establishment request, can determine whether SCC AS supports priority service.

Concrete, in the session establishment process of UE, when UE is caller, SCC AS receives the session establishment request of UE, determining self to support priority service, and during UE support priority service, such as, the instruction that UE supports priority service is carried in the session establishment request that SCC AS receives, SCC AS sends the reply message of session establishment request to UE, and carry the instruction that SCC AS supports priority service within the message, such as carry g.3gpp.priority at the contact header field of this message; And when UE is called, SCC AS receives the session establishment request of calling UE, after determining self to support priority service, SCC AS sends session establishment request message to called UE, and carry the instruction that SCC AS supports priority service within the message, such as carry g.3gpp.priority at the contact header field of this message.

As shown in Figure 4, a kind of method realizing SRVCC that the embodiment of the present invention provides, based on UE, comprising:

S41, UE are adjusted to CS territory by PS territory;

S42, when this UE judges self to have one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

In PS territory, UE is the situation of caller, can be known the priority level information of session by the reply message UE of caller request, if UE is called, then in session establishment request message, carries the priority level information, and be sent to UE, UE preserves this information.Therefore no matter caller, called situation, preserve the priority level information of session in UE.Therefore, UE can know in UE the priority level that there is priority session and session, and then to conversate transfer according to the priority level of session.

The method realizing SRVCC of the embodiment of the present invention, the switching that UE can conversate according to the precedence information of session, namely preferentially can switch the high session of priority, ensures normally carrying out of priority session.

Wherein, UE is according to the priority level of session, and the principle that the session the highest to priority is preferentially shifted is identical with SCC AS side, to ensure the reliability of Session Hand-off.The principle of the transfer that conversates of UE can the description of principle of the Session Hand-off about SCC AS as detailed above, repeats no more here.

In addition, the present embodiment realizes the method for SRVCC, before S42 step, also can comprise:

Determine whether self and corresponding SCC AS support MSC Server assisted mid-cal characteristic, to determine the session number carrying out shifting.

In addition, the present embodiment realizes the method for SRVCC, and in the priority level according to session, the principle preferentially shifted according to the session that priority is high conversates before transfer, also can comprise:

Determine self to support priority service;

Determine self to support priority service, according to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine that the SCC AS of self correspondence supports priority service.

In the priority level of UE according to session, before the session the highest to priority is preferentially shifted, first UE can determine whether the SCC AS of self and correspondence supports priority service, when UE self and corresponding SCC AS all supports priority service, UE to conversate transfer according to the principle that the session that priority is high is preferentially shifted, otherwise mode conventionally conversates transfer.

When UE is caller, SCC AS receives the session establishment request of UE, when SCC AS supports priority service and knows UE support priority service, the instruction that SCC AS supports priority service can be carried in the reply message of the session establishment request sent to UE, such as, can carry g.3gpp.priority at the contact header field of session establishment request message; When UE is called, if during SCC AS support priority service, SCC AS can carry the instruction that SCC AS supports priority service in the session establishment request sent to called UE, such as, can carry g.3gpp.priority at the contact header field of session establishment request message.Therefore, according to the reply message of session establishment request received in session establishment process or session establishment request, UE can determine whether SCCAS supports priority service.UE determines to carry support priority service indication information in the message received in session establishment process, namely determines that corresponding SCC AS supports priority service.

In like manner, when the SRVCC conversated when SCC AS side switches, can need equally to know whether corresponding UE supports priority service, therefore, the method of the present embodiment SRVCC, knows that in order to make SCC AS UE supports priority service, in the priority level of UE according to session, before the session the highest to priority is preferentially shifted, also can comprise:

Determine self to support priority service;

Send the reply message of session establishment request or session establishment request, the instruction that self supports priority service is carried in the reply message of described session establishment request or session establishment request, be convenient to the reply message of corresponding SCC AS according to described session establishment request or session establishment request, determine whether UE supports priority service.

Concrete, in the session establishment process of UE, when UE is caller, UE determines self to support priority service, session establishment request message is sent to SCC AS, and carry the instruction that UE supports priority service within the message, such as carry g.3gpp.priority at the contact header field of this message; When UE is called, and determine self to support that priority service and SCC AS support priority service, such as, the instruction that SCC AS supports priority service is carried in the session establishment request that UE receives, UE sends the reply message of session establishment request to SCC AS, and carry the instruction that UE supports priority service within the message, such as carry g.3gpp.priority at the contact header field of this message.

Further, the method for the present embodiment, also can comprise:

For first the session distribution T I value preferentially shifted is 0, when the session shifted is more than 1, for second session distribution T I value of transfer is 1, to make UE, session is controlled.

As shown in Figure 5, the multiple sessions illustrated below as UE only have a priority session, and UE or network side entity do not use MSC Server assisted mid-call characteristic, when namely can only shift a session in UE, the method of what the present embodiment provided realize SRVCC, comprising:

101, UE is to the base station eNodeB strength of transmitted signals examining report of source network E-UTRAN (Enhanced-UMT S Terrestrial RadioAccess Network, the land radio access web of evolution).Here, UMTS (Universal Mobile Telecommunications System) meaning and universal mobile telecommunications system.

102, based on the measurement report of UE, eNodeB decision-making performs the SRVCC process switched to target CS territory, then the MME to source network sends the handover request message of PS territory to CS territory SRVCC, and MME receives handover request message.

103, the SRVCC indication message that MME carries according to handover request message, detect the precedence information of voice bearer, judged the priority level of voice bearer respective session by the ARP parameter of carrying, and select the highest voice bearer of priority level to be separated.

104, MME asks to MSC Server transmission PS territory to the SRVCC in CS territory, and carried the precedence information of the voice bearer of described separation by Sv flag or STN-SR in this request message, MSC Server receives this handover request message.

Described precedence information comprise this carrying priority level, whether the instruction of preempting resources and the resource of this carrying correspondence whether can allow the instruction that is preempted.

105, according to the precedence information of this message, MSC Server knows that this request needs according to priority mode process, MSC Server is to base station, control CS territory B SS (Base StationSubsystem, base station sub-system module) the target MSC Server of/RNS (Radio Network Subsystem, RNS) sends the PS territory of carrying precedence information and asks to the SRVCC in CS territory, and target MSC Server receives this handover request.

Concrete, if eMLPP (Enhanced Multi-Level PrecedenceAnd Pre-Emption Service is supported in CS territory, preferential and the resource strengthened seizes business business in advance), first the PS territory precedence information received is converted into precedence information corresponding to eMLPP business by MSCServer, carries in the SRVCC request sent to target MSC Server.

106, target MSC Server send the PS territory of carrying precedence information to target BS asks to the SRVCC in CS territory, is the CS territory radio frequency resource that session priority allocation to be transferred is suitable to make target BS according to the precedence information of session.

107, target MSC server return response message to SRVCC request.

108, MSC Server control MGW preferentially establishes the carrying of CS territory.

109, MSC Server initiates the Session Hand-off process of IMS layer, and send the session transfer request of IMS layer to SCC AS, carry precedence information in this request, SCC AS receives this request.

110, SCC AS judges that user equipment (UE) corresponding to described session transfer request has one or more priority session, the transfer process of execution priority session, upgrades opposite end branch, and the branch of source access network is discharged.

This step specifically can comprise:

SCC AS determines that UE and network side do not support MSC Server assisted mid-call characteristic;

SCC AS determines self to support priority service;

SCC AS, according to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determines that UE corresponding to described session transfer request supports priority service;

SCC AS carries out the transfer of priority session, upgrades opposite end branch, and is discharged by the access tributary of this priority session at source access network;

When the precedence information in session transfer request is different from the former session priority information of preservation, SCC AS carries new precedence information in the process upgrading opposite end, makes the Qos parameter that opposite end carries by new priority update.

In addition, in the session establishment process of UE, SCC AS can carry the instruction that SCC AS supports priority service in the reply message of the session establishment request or session establishment request that send to UE, to inform that UE SCC AS supports priority service.

111, MSC Server returns the transfer request response message of PS territory to CS territory of MME transmission.

Note: above 2 steps can synchronously be carried out.

112, MME sends switching command to the eNodeB of E-UTRAN network.

113, eNodeB sends switching command to UE, and UE receives described switching command;

114, UE is adjusted to CS territory by PS territory, when judging self to have a priority session, by this Session Hand-off to CS territory.

This step specifically can comprise:

UE is adjusted to CS territory by PS territory;

UE determines that self and network side do not support MSC Server assisted mid-call characteristic;

UE determines self to support priority service;

UE, according to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determines that the SCC AS of self correspondence supports priority service;

UE carries out the transfer of priority session.

In addition, in the session establishment process of UE, UE can carry the instruction that UE supports priority service in the reply message of the session establishment request or session establishment request that send to SCC AS, to inform that SCC AS UE supports priority service.

Other processes are same as the prior art, repeat no more here.

As shown in Figure 6, illustrate the method realizing SRVCC when there is multiple session and comprise multiple priority session in UE below, in the present embodiment, UE and network entity all support MSC assisted mid-call characteristic, there are two sessions in UE, and one is the session of hold mode, another is the session of state of activation, and all there is priority, and suppose the priority of the priority of the session of hold mode higher than the session of state of activation, comprising:

201, UE is to the base station eNodeB strength of transmitted signals examining report of source network E-UTRAN.

202, based on the measurement report of UE, eNodeB decision-making performs the SRVCC process switched to target CS territory, then the MME to source network sends the handover request message of PS territory to CS territory SRVCC, and MME receives handover request message.

203, the SRVCC indication message that MME carries according to handover request message, detect the precedence information of voice bearer, judged the priority level of voice bearer respective session by the ARP parameter of carrying, and select the highest voice bearer of priority level to be separated.

204, MME asks to MSC Server transmission PS territory to the SRVCC in CS territory, and carried the precedence information of the voice bearer of described separation by Sv flag or STN-SR in this request message, MSC Server receives this handover request message.

205, according to the precedence information of this message, MSC Server judges that this request needs according to priority mode process, MSC Server sends the PS territory of carrying precedence information and asks to the SRVCC in CS territory to the target MSC Server of base station, control CS territory B S S/RNS, target MSC Server receives this handover request;

206, target MSC Server send the PS territory of carrying precedence information to target BS asks to the SRVCC in CS territory, is the CS territory radio frequency resource that session priority allocation to be transferred is suitable to make target BS according to the precedence information of session.

207, target MSC server returns response message to handover request.

208, MSC Server control MGW preferentially establishes the carrying of CS territory.

209, MSC Server initiates the Session Hand-off process of IMS layer, and send the session transfer request of IMS layer to SCC AS, carry precedence information in this request, SCC AS receives this request.

210, SCC AS determines that UE and network side support MSC Server assisted mid-call characteristic, and stores the session related information of UE according to self, judges that UE has multiple priority session.

211, SCC AS determines self to support priority service, and according to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine the user equipment (UE) support priority service that described session transfer request is corresponding, the principle that SCC AS preferentially shifts according to the session the highest to priority selects session to be transferred, upgrades the transfer that opposite end completes first the highest session of priority.

Herein, first SCC AS shifts the highest hold mode session of priority, and keeps the hold mode of this session.

SCC AS is in the process upgrading opposite end, if the precedence information received from MSC Server is different from the former session priority information of preservation, then in the process upgrading opposite end, carry new precedence information, make the Qos parameter that opposite end carries by new priority update.

212, SCC AS initiates the transfer process of second session to be transferred, if this session is priority session, the precedence information of session is carried in the session state information of second session to be transferred that then SCC AS sends to MSC Server, precedence information can carry in the message body of the message header of sip message or sip message, MSC Server preserves precedence information, provides the precedence information of session when being transferred back to PS territory for UE.

SCC AS selects priority time high state of activation session to shift herein, its session state information (comprising the precedence information of this session) is sent to MSC Server, is initiated the transfer of this session by MSCServer.And SCC AS keeps the state of activation of this session.

213, optionally, when Gm does not retain or there are not non-voice media, the access tributary at former PS territory access network discharges by SCC AS.

214, MSC Server returns the transfer request response message of PS territory to CS territory of MME transmission.

Note: 209-213 walks the execution independent of 214 steps.

215, MME sends switching command to the eNodeB of E-UTRAN network.

216, eNodeB sends switching command to UE, and UE receives described switching command.

217, UE is adjusted to CS territory by PS territory.

218, UE judges self to have multiple priority session, and dialogue is transferred to target CS territory by the principle that the session the highest to priority is preferentially shifted, and first shifts the highest hold mode session of priority, and keep the hold mode of this session, then shift the secondary high state of activation session of priority.

In the present embodiment, UE and network entity support MSC assisted mid-call characteristic, at this moment, when session packet multiple in UE is containing at least one priority session, UE judges from the UE as support priority service, and according to the instruction of the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine that the SCC AS of self correspondence supports priority service, then UE selects session by the priority policy identical with SCC AS, CS territory is preferentially transferred in the session with priority, and session status to be transferred is replaced with the newly-built session in CS territory, when shifting two sessions in multiple session as UE, for the session distribution T I value 0 that the priority preferentially shifted is higher, another one session distribution T I to be transferred value 1.When shifting a session in multiple session as UE, it is selected session distribution T I value 0 to be transferred.If other sessions are not released successfully, then other sessions discharge by UE, delete session status;

And if UE or network entity do not support MSC assisted mid-call characteristic, when session packet multiple in UE is containing at least one priority session, and UE and SCC AS supports priority service, then UE presses SCC AS same policy selection Session Hand-off to CS territory, session status to be transferred being replaced with the newly-built session in CS territory, is selected session distribution T I value 0 to be transferred.If other sessions are not released successfully, then other session status are deleted by UE;

Herein, UE is the hold mode distribution T I value 0 that priority is high, the secondary high state of activation session distribution T I value 1 of priority.

Optionally, if Gm retains, then UE upgrades non-voice media by Gm, and is deleted by voice medium.

Other processes are same as the prior art, repeat no more here.

Accordingly, as shown in Figure 7, embodiments of the invention additionally provide a kind of MME, comprising:

Receiving element 10, for receiving handover request message;

Separative element 11, according to the SRVCC indication message that described handover request message is carried, detect the precedence information of voice bearer, and the voice bearer the highest to priority level is separated;

Transmitting element 12, asks to the SRVCC of circuit-switched CS domain for sending packet switched ps domain, and in this SRVCC asks, carries the precedence information of the voice bearer of separation, to make CS territory entity according to described precedence information priority allocation CS territory resource.

The MME that the embodiment of the present invention provides, the separation of voice bearer can be carried out according to the priority level of session, and the SRVCC request of carrying precedence information can be sent to target CS territory network, objective network is enable to be the to be switched session according to priority corresponding radio frequency resource of mode priority allocation according to the precedence information in handover request, to set up the carrying of CS territory, ensure normally carrying out of priority session.

Wherein, separative element 11 can detect the precedence information of voice bearer specifically for the ARP parameter by carrying, and judge the priority level of voice bearer respective session, and selects session that priority is the highest to carry out the separation of voice bearer.

Concrete, the priority level information can comprise three partial contents, is respectively: whether whether the priority level of the voice bearer be separated, this carrying the instruction of preempting resources and the resource of this carrying correspondence can allow the instruction that is preempted.In addition, the instruction whether allowed request queue can also be comprised in the priority level information.The particular content of the priority level information can be arranged according to the actual conditions such as system configuration and carrier policy.

In addition, transmitting element 12 can be asked specifically for the SRVCC of transmission PS territory to CS territory, and this SRVCC request utilizes Sv flag parameter or STN-SR to carry described the priority level information.

Accordingly, as shown in Figure 8, embodiments of the invention additionally provide a kind of CS territory entity, comprising:

Receiving element 20, asks to the SRVCC in CS territory for receiving PS territory, carries precedence information in described SRVCC request;

Processing unit 21, for according to the described precedence information in described SRVCC request, priority allocation CS territory resource;

Transmitting element 22, for sending session transfer request to service set and continuous server SCC AS.

The CS territory entity that the embodiment of the present invention provides, according to the handover request received, according to priority mode, namely can be preferably to be switched session and distributes corresponding radio frequency resource, to set up the carrying of CS territory, therefore, it is possible to ensure normally carrying out of priority session.

Wherein, processing unit 21 can be further used for the described SRVCC received to ask the precedence information carried to be converted into precedence information corresponding to eMLPP business, during to CS territory request dispatching resource, carries the precedence information that described eMLPP business is corresponding.

Accordingly, as shown in Figure 9, embodiments of the invention additionally provide a kind of SCC AS, comprising:

Receiving element 30, for receiving the session transfer request that mobile switching center server MSC Server sends;

Processing unit 31, during for judging that user equipment (UE) corresponding to described session transfer request has one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

The SCC AS that the embodiment of the present invention provides, the transfer that can conversate according to the priority level of session, namely preferentially can shift the high session of priority, ensures priority session.

Wherein, processing unit 31 is according to the priority level of session, and the principle that the session the highest to priority is preferentially shifted can as detailed abovely describe, and repeats no more here.

In addition, as shown in Figure 10, the SCC AS of the present embodiment can comprise further:

Determining unit 32, self priority service is supported for determining, also for the instruction according to the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine the user equipment (UE) support priority service that described session transfer request is corresponding.

Now, processing unit 31 is by the determination result according to determining unit 32, and when the UE that self and session transfer request are corresponding all supports priority service, according to the priority level of session, the session the highest to priority is preferentially shifted.Otherwise, conventionally process.

Further, as shown in figure 11, the SCC AS of the present embodiment can comprise further:

First transmitting element 33, for when self supporting priority service, send the reply message of session establishment request or session establishment request, the instruction that self supports priority service is carried in the reply message of described session establishment request or session establishment request, to inform the UE that session transfer request is corresponding, SCC AS supports priority service.

Further, as shown in figure 12, the SCC AS of the present embodiment can comprise further:

Second transmitting element 34, for when second session to be transferred in a transfer process is priority session, the precedence information of described second session to be transferred is sent, to make described MSC Server for providing described precedence information when described second Session Hand-off to be transferred goes back to PS territory to MSC Server.

Accordingly, as shown in figure 13, embodiments of the invention additionally provide a kind of UE, comprising:

Adjustment unit 40, for being adjusted to CS territory by PS territory;

Buanch unit 41, for when judging self to have one or more priority session, according to the priority level of session, the session the highest to priority is preferentially shifted.

The UE that the embodiment of the present invention provides, the switching that can conversate according to the precedence information of session, namely preferentially can switch the high session of priority, ensures normally carrying out of priority session.

Wherein, buanch unit 41 according to the priority level of session, the principle preferentially shifted according to the session that priority is the highest conversate transfer principle identical with the principle of SCC AS, to ensure the reliability of Session Hand-off.Description in Specific Principles embodiment of the method as detailed above, repeats no more here.

As shown in figure 14, the UE that the present embodiment provides, also can comprise allocation units 42 further, be 0 for first session distribution T I value for preferential transfer, when the session shifted is more than 1, for second session distribution T I value of transfer is 1, to make UE, session is controlled.

In addition, as shown in figure 15, the UE that the present embodiment provides can comprise further:

Determining unit 43, self priority service is supported for determining, also for the instruction according to the support priority service carried in the reply message of the session establishment request received in session establishment process or session establishment request, determine that the SCC AS of self correspondence supports priority service.

Now, buanch unit 41 is by the determination result according to determining unit 43, and when self and corresponding SCC AS all support priority service, according to the priority level of session, the principle preferentially shifted according to the session that priority is high conversates transfer.Otherwise, conventionally process.

In addition, as shown in figure 16, the UE that the present embodiment provides can comprise further:

Transmitting element 44, for when self supporting priority service, send the reply message of session establishment request or session establishment request, the instruction that self supports priority service is carried in the reply message of described session establishment request or session establishment request, to inform corresponding SCC AS, UE supports priority service.

It should be noted that, for Fig. 6, another kind provided by the invention realizes the method flow of SRVCC, description specific as follows:

As shown in Figure 6, the method for the SRVCC when there is multiple session and comprise one or more priority session in UE is illustrated below.In the present embodiment, UE and network entity all support MSC assisted mid-call characteristic, there are two sessions in UE, one is the session of hold mode, another is the session of state of activation, and all there is priority, and suppose the priority of the priority of the session of hold mode higher than the session of state of activation, comprising:

The execution of 203 steps can perform by any one mode of 203a or 203b.

203a, MME judge the priority level of voice bearer respective session according to the ARP parameter of carrying, and select the highest voice bearer of priority level to be separated, and obtain the precedence information of this carrying.

203b, the SRVCC indication message that MME comprises according to handover request message, and voice bearer is separated from non-voice carrying by the QCI value of carrying, carrying by QCI=1 is separated, and to be this voice bearer initiate the transfer process of PS territory to CS territory to the MSC Server of target access network.

Illustrate: the carrying separation process Exactly-once of MME.Therefore, as long as MME isolates the voice bearer of a QCI=1 herein.

Meanwhile, MME, by judging that carrying ARP value compares the priority level of carrying, obtains the precedence information of the highest carrying of priority level.

Precedence information described in 203a or 203b comprise this carrying priority level, whether can the instruction of preempting resources, the resource of this carrying correspondence whether allow in the instruction be preempted one or more.

204, MME sends the SRVCC request message of PS territory to CS territory to MSC Server, and carries the precedence information obtained in 203a or 203b, and concrete carries described precedence information by Sv flag or STN-SR in this request message.

205, according to the precedence information of this message, MSC Server judges that this request needs according to priority mode process, MSC Server sends the PS territory of the carrying precedence information preparation handover request message (Prepare HO request) to CS territory to the target MSC Server of control CS territory base station BS S/RNS, target MSC Server receives this handover request message;

Before transmission preparation handover request message, MSC Server shifts instruction according to PS territory to CS territory SRVCC, be CS territory precedence information by PS territory loading priority information MAP (map), the discernible priority level of CS territory entity is mapped as by priority level, and by whether allow to seize, whether allow be preempted parameter be converted to the discernible parameter of CS territory entity, carry in the SRVCC request sent to target MSC Server.Concrete, when PS territory loading priority and CS territory precedence information can be directly corresponding, then the precedence information received can carry by MSC Server in the preparation handover request sent to target MSC Server.This MSCServer refers to the MSC Server receiving MME handover request.

PS territory precedence information is converted to CS territory precedence information by the above, also can realize in the following manner, and operator is according to policy selection wherein any one scheme.

In the 204th step, MME shifts instruction according to PS territory to CS territory SRVCC, PS territory precedence information is mapped (map) for precedence information corresponding to CS territory, the samely priority level is mapped as the discernible priority level of CS territory entity, and by whether allow to seize, whether allow be preempted parameter be converted to the discernible parameter of CS territory entity.Concrete, when PS territory loading priority information and CS territory precedence information can be directly corresponding, then loading priority information can be carried by mode described in the 204th step by MME in the handover request to MSC Server.

206, target MSC Server send the PS territory of the carrying precedence information handover request message to CS territory to target BS, are the CS territory radio frequency resource that session priority allocation to be transferred is suitable to make target BS according to the precedence information of session.

207, target MSC server returns response message to handover request.

209, MSC Server initiates the Session Hand-off process of IMS layer, and send the session transfer request message of IMS layer to SCC AS, comprise precedence information in this request, to make the according to priority mode process of this request message, SCC AS receives this request.

Precedence information specifically comprises priority instruction, one or more in the priority level information herein.And MSC Server is when sending IMS domain transfer request message, PS territory loading priority information MAP (map) will be received for precedence information corresponding to IMS domain session, carrying in transfer request message.Concrete, be not mapped as priority level corresponding to IMS domain session by receiving PS territory loading priority.

In session transfer request, carry precedence information is optional step.

210, SCC AS determines that UE and network side support MSC Server assisted mid-call characteristic, and stores the session related information of UE according to self, determines that UE has multiple priority session.

211, SCC AS judges to determine self to support priority service, and determine that the session establishment message that session establishment process receives or session establishment are replied message and carried the instruction that UE supports priority service, SCC AS selects session to be transferred according to the principle that the session that priority is high is preferentially shifted, and upgrades the transfer that opposite end completes first the highest session of priority.

212, SCC AS initiates the transfer process of second session to be transferred, if this session is priority session, the precedence information of session is comprised in the session state information of second session to be transferred that then SCC AS sends to MSC Server, precedence information can carry in SIP head or sip message message body, MSC Server preserves precedence information, provides the precedence information of session when being transferred back to PS territory for UE.

SCC AS selects priority time high state of activation session to shift herein, and its session state information (comprising the precedence information of this session) sends to MSC Server, is initiated the transfer of this session by MSCServer.And SCC AS keeps the state of activation of this session.

Note: 209-213 walks the execution independent of 214 steps.

215, MME sends switching command to the eNodeB of E-UTRAN network.

217, UE transfers to target CS territory.

Session is linked into target CS territory by 218, UE.

In this step, if if UE and network entity support MSC assisted mid-call characteristic:

When session packet multiple in UE is containing at least one priority session, UE judges from the UE as support priority service, and the session establishment request received in session establishment process or reply in message and comprise the instruction that SCC AS supports priority service, then UE selects session by the priority policy identical with SCC AS, CS territory is preferentially transferred in the session with priority, and session status to be transferred is replaced with the newly-built session in CS territory, when shifting two sessions in multiple session as UE, for the session distribution T I value 0 that the priority preferentially shifted is higher, another one session distribution T I to be transferred value 1.When shifting a session in multiple session as UE, it is selected session distribution T I value 0 to be transferred.If other sessions are not released successfully, then other sessions discharge by UE, delete session status;

And if if UE or network entity do not support MSC assisted mid-call characteristic:

When session packet multiple in UE is containing at least one priority session, and UE and SCC AS supports priority service, then UE presses SCC AS same policy selection Session Hand-off to CS territory, and session status to be transferred being replaced with the newly-built session in CS territory, is selected session distribution T I value 0 to be transferred.If other sessions are not released successfully, then other session status are deleted by UE;

Other processes are same as the prior art, repeat no more here.

As shown in figure 17, the embodiment of the present invention provides another kind to realize the method for SRVCC, and based target CS territory entity, comprising:

S51, receives handover request message;

S52, obtains the precedence information of the highest voice bearer of priority level;

Described precedence information comprises following at least one: the priority level of described voice bearer, whether the instruction of preempting resources or resource corresponding to described voice bearer whether can allow the instruction that is preempted.

The precedence information of the voice bearer that described acquisition priority level is the highest comprises:

Detect the priority level of voice bearer, the voice bearer the highest to priority level is separated, and obtains the precedence information of the highest voice bearer of priority level.Or,

Be separated voice bearer, obtain the precedence information of the highest voice bearer of priority level.

S53, sends the handover request message of PS territory to CS territory, and in this handover request message, carries described precedence information, to make entity priority allocation CS territory, CS territory resource.

Described transmission PS territory to the handover request message in CS territory, and is carried described precedence information and is comprised in this handover request message:

The precedence information of acquisition is mapped as precedence information corresponding to CS territory, carries in the handover request message of PS territory to CS territory.Or,

Send the handover request message of PS territory to CS territory, described handover request message utilizes Sv flag parameter or injection Session Hand-off number STN-SR frequently to carry the priority level information of the voice bearer of described separation.

As shown in figure 18, the embodiment of the present invention provides another kind to realize the method for SRVCC, based on MSC server, comprising:

S61, receives PS territory to the handover request message in CS territory, carries precedence information in described handover request message;

S62, sends preparation handover request message to target mobile switching centre, in this preparation handover request message, carries described the priority level information;

Described transmission to target mobile switching centre prepares handover request message, carries described the priority level information, comprising in this preparation handover request message:

The precedence information that the CS territory that the described described precedence information received is mapped as target mobile switching centre place is corresponding.

S63, sends session transfer request message to SCC AS.

Described to SCC AS transmission session transfer request message, comprising:

The precedence information carried in the PS territory received to the handover request message in CS territory is mapped as the priority instruction in the session transfer request message sent to SCC AS, carries in described session transfer request message.

As shown in figure 19, the embodiment of the present invention provides another kind to realize the method for SRVCC, based on SCC AS, comprising:

S71, receives the session transfer request message that MSC Server sends;

S72, when the user equipment (UE) at the session place of shifting has one or more priority session, the session the highest to priority level is preferentially shifted.

The described priority level according to session, the session the highest to priority level is preferentially shifted, and comprising:

When the session that described priority is the highest is state of activation session, select the session of priority time high session or other states that are activated recently again or select the session of nearest held state to shift, and selected state of activation session is set to hold mode; Or,

When the session that described priority is the highest is hold mode session, hold mode information is sent to MSC Server, when also having state of activation session in the user equipment (UE) that session transfer request is corresponding, select priority time high state of activation session or the state session that is activated recently to shift, and keep the state of activation of selected session.

Optionally, described method also comprises:

By other sessions release except the highest session of described priority and selected session.

The embodiment of the present invention provides another kind of mobile management entity, see Figure 20, comprising:

Receiving element 61, for receiving handover request message;

Acquiring unit 62, for obtaining the precedence information of the highest voice bearer of priority level;

Transmitting element 63, for sending the handover request message of PS territory to CS territory, and carries described precedence information in this handover request message, to make entity priority allocation CS territory, CS territory resource.

Optionally,

Described acquiring unit 61 at least comprises any one unit following:

First acquiring unit, for detecting the priority level of voice bearer, the voice bearer the highest to priority level is separated, and obtains the precedence information of the highest voice bearer of priority level;

Second acquisition unit, is separated voice bearer, obtains the precedence information of the highest voice bearer of priority level.

Optionally,

Described transmitting element 63 at least comprises any one unit following:

First transmitting element, for the priority level of acquisition is mapped as priority level corresponding to CS territory, carries in the handover request message of PS territory to CS territory;

Second transmitting element, for sending the handover request message of PS territory to CS territory, described handover request message utilizes Sv flag parameter or injection Session Hand-off number STN-SR frequently to carry the priority level information of the voice bearer of described separation.

The embodiment of the present invention provides a kind of SCC AS, see Figure 21, comprising:

Receiving element 70, for receiving the session transfer request message that MSC Server sends;

Buanch unit 71, for when the user equipment (UE) at the session place of shifting has one or more priority session, the session the highest to priority level is preferentially shifted.

Optionally, described buanch unit 71 at least comprises at least one unit:

First buanch unit, when being state of activation session for the session the highest when described priority, select the session of priority time high session or other states that are activated recently again or select the session of nearest held state to shift, and selected state of activation session is set to hold mode;

Second buanch unit, when the session that described priority is the highest is hold mode session, hold mode information is sent to MSC Server, when also having state of activation session in the user equipment (UE) that session transfer request is corresponding, select priority time high state of activation session or the state session that is activated recently to shift, and keep the state of activation of selected session.

Optionally, described SCC AS also comprises:

Releasing unit, for by other sessions release except the highest session of described priority and selected session.

One of ordinary skill in the art will appreciate that: all or part of flow process realizing said method embodiment can have been come by the hardware that computer program instructions is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims

1. realize a method of the continuous voice call SRVCC of injection frequency subscriber equipment, it is characterized in that, comprising:

Mobile Switching Center Server receives PS territory to the SRVCC request message in CS territory, carries PS territory loading priority information in described SRVCC request message;

The described PS territory loading priority information MAP received is CS territory precedence information by described Mobile Switching Center Server;

Described Mobile Switching Center Server sends preparation handover request message to target Mobile Switching Center Server, carries described CS territory precedence information in described preparation handover request message;

The described PS territory loading priority information MAP received is IMS domain precedence information by described Mobile Switching Center Server;

Described Mobile Switching Center Server sends the session transfer request message of carrying described IMS domain precedence information to service set and continuous server SCC AS.

2. method according to claim 1, it is characterized in that, described CS territory precedence information comprises following at least one or combination in any: whether the priority level of CS territory business, the resource of the instruction of preempting resources or CS territory business that whether allows of CS territory business allow the instruction be preempted.

3. method according to claim 1, it is characterized in that, described PS territory loading priority information comprises following at least one: the priority level of described carrying, whether the instruction of preempting resources or the resource of described carrying correspondence whether can allow the instruction that is preempted.

4. method according to claim 3, is characterized in that, described IMS domain precedence information comprises following at least one or combination in any: priority level or priority instruction.

5. method according to claim 4, is characterized in that, the described PS territory loading priority information MAP received is that IMS domain precedence information comprises by described Mobile Switching Center Server:

The described PS territory loading priority received is not mapped as IMS domain priority level by described Mobile Switching Center Server.

6. a Mobile Switching Center Server, is characterized in that, comprising:

Receiving element, for receiving the continuous voice call SRVCC request message of PS territory to the injection frequency subscriber equipment in CS territory, carries PS territory loading priority information in described SRVCC request message;

The described PS territory loading priority information MAP received for being CS territory precedence information by received described PS territory loading priority information MAP, and is IMS domain precedence information by map unit;

Transmitting element, for sending preparation handover request message to target Mobile Switching Center Server, in described preparation handover request message, carry described CS territory precedence information, and send the session transfer request message of carrying described IMS domain precedence information to service set and continuous server SCC AS.