CN101841793B - Method and system for logging off emergency call user - Google Patents

Abstract

The invention discloses a method for logging off an emergency call user, which comprises the following steps of: staring a logoff timer when the user equipment (UE) is emergently attached to an evolved packet system (EPS) network, and a mobile management entity (MME) determines that the emergency call of the UE is finished according to a received message; and logging off the UE from the EPS network by the MME, when the logoff timer is due. The invention also discloses a system for logging off the emergency call user, which solves the problem that the emergency call is easy to interrupt in the conventional logoff method.

Description

A kind of method and system of logging off emergency call user

Technical field

The present invention relates to the urgent call technology under system's Long Term Evolution (SAE) access, relate in particular to a kind of method and system of logging off emergency call user.

Background technology

IP Multimedia System (IMS, IP Multimedia Subsystem) be the core of New Generation of Communication network, its distinguishing feature is to have adopted Session initiation Protocol (SIP, Session Initiation Protocol) system, communication is irrelevant with access, and possesses the media service control function and separate with bearing capacity, calling separates with session, application separates with service, business and network detach, and the several functions such as mobile network and internet integrated services.

Because the characteristics that IMS and access are irrelevant, urgent call (EMC under the IMS, Emergency Call) business, can build at GPRS (GPRS, General Packet Radio Service) network and the Long Term Evolution (SAE of system, System Architecture Evolution) on the network, provides unified urgent call control.

User terminal (UE in the prior art, User Equipment) by accessing the Organization Chart of SAE network execution EMC business, as shown in Figure 1, this framework comprises: SAE network portion, policy and charging control (PCC, Policy Charging Control) partly, location-based service (LCS, Location Service) part and IMS urgency traffic part.

Wherein, bearer management and the mobile management function of SAE network portion in order to bottom to be provided, the network element of this part mainly comprises: the wireless base station of enhancing (eNodeB), Mobility Management Entity (MME, MobilityManagement Entity) and system's Long Term Evolution gateway (SAE GW, System ArchitectureEvolution Gateway).SAE GW is the functional entity of user's face, is used for carrying out the data route processing of user's face, is divided into two kinds of gateway (S-GW, Serving GW) and packet data network gateways (P-GW, Packet Data Network GW).

The PCC part is in order to set up effectively strategy, charging control at bottom bearing bed and upper-layer service layer, the network element of this part mainly comprises: "Policy and Charging Rules Function (PCRF, Policy and Charging RulesFunction) entity and strategy and charge execution function (PCEF, Policy and Charging EnforcementFunction) entity.

LCS is partly with thinking that urgent call provides location-based service and public safety joint point (PSAP, PublicSafety Access Point) address, the network element of this part mainly comprises: position requests function (LRF, Location Require Function) entity and Gateway Mobile Location Center (GMLC, Gateway MobileLocation Center).

IMS urgency traffic part is in order to the session of control and processing urgent call, the network element of this part mainly comprises: home subscriber server (HSS, Home Subscriber Server), CSCF (CSCF, Call Session Control Function).The subscription data of the main leading subscriber of HSS is positioned at home network.CSCF is the core network element of control conversation procedure, comprise: proxy CSCF (P-CSCF, Proxy-CSCF), inquiry CSCF (I-CSCF, Interrogating-CSCF), serving CSCF (S-CSCF, Serving-CSCF), urgent CSCF (E-CSCF, Emergency-CSCF).Wherein, E-CSCF is the session control center of urgent call, and it determines urgent call is routed to which public safety answering point (PSAP, Public SafetyAnswer Point).

UE under the SAE access is operated under the restricted pattern sometimes, and namely UE is limited service; In this case, the proper network that UE initiates adheres to and professional foundation asked, and will be refused by network.Yet, usually require the UE under the restricted pattern also can initiate urgent call in the practical application; Therefore, at third generation partner program (3GPP, 3rd Generation Partnership Project) evolved packet system (EPS of research, Evolved Packet System) in the support to urgent call, impel the UE under the restricted pattern emergency attached (EmergencyAttach) to arrive the EPS network, and set up the emergency bearing (Emergency Bearer) that is specifically designed to urgent call.

For the UE under the restricted pattern, its realization urgent call need to be carried out the operation of setting up emergency bearing and initiating urgent call.What is called is set up emergency bearing, and namely UE initiates emergency attached request, and informs that by the urgent sign of carrying current adhering to of bearer network is for placement of emergency calls; After bearer network receives the emergency attached request of UE, by a urgent APN (E-APN, Emergency Access PointName), set up a default bearer that is specifically designed to urgent call, this default bearer is mainly used in signaling control.So-called urgent call, namely UE shows that by carry urgent sign in normal call request message this call request is a urgent call.

Be different from the foundation for the default bearer of signaling control, when UE initiates urgent call, also need to set up one be used for voice-bearer indicate carrying (Dedicated Bearer), namely be used for the user plane bearer that voice medium transmits.Indicating carrying is a carrying with fixed service quality (QoS, Quality ofService) requirement that is different from default bearer.Indicate the foundation of carrying, the UE that is controlled to be that can be bearer network by PCC sets up, and also can be that UE indicates bearer network to set up voluntarily.If the be controlled to be UE of bearer network by PCC sets up and to indicate carrying, the foundation that then indicates carrying has the participation of dynamic PCC; If UE indicates bearer network to set up voluntarily, then bearer network adopts static PCC strategy to come to indicate carrying for UE sets up.

So-called dynamically PCC refers to that the main policies controlled entity PCRF indication according to application function point (AF, Application Function) in the SIP conversation procedure among the PCC is set up, change, discharges the EPS carrying of appointment.In the process of SIP session establishment, release, the P-CSCF for the treatment of S IP signaling is as an AF and PCRF dynamic communication, by PCRF the session of SIP layer and the carrying of EPS layer are dynamically bound, P-CSCF can carry out foundation, change, the release of media resource (being the voice equivalent-load of bottom) according to the requirement notice PCRF of SIP session like this, and PCRF further notifies P-GW to carry out foundation, change, the release of concrete carrying.Carry out in the process of carrying foundation, change, release at P-GW, P-GW will report by S-GW the situation of change of carrying to MME.

So-called static PCC refers to that PCRF does not set up, changes, discharges the EPS carrying according to the indication of AF in the SIP conversation procedure; And set up, change, discharge the EPS carrying simply by virtue of the static urgent call policy data of self storing.Do not dispose even PCRF, and only at the policy data of P-GW (PCEF) deploy urgent call.In this case, be used for foundation, change, the release of the emergency bearing of urgent call, controlled by UE.UE controls foundation and the release that indicates carrying according to foundation, the dispose procedure of SIP signaling in the emergent session.

The process that UE sets up emergency bearing in the prior art mainly may further comprise the steps as shown in Figure 2:

Step 201～202, UE initiates emergency attached request to eNodeB, is the MME that UE selects service by eNodeB, and transmits emergency attached request to this MME.

Step 203～206, MME is to the operation of home subscriber server (HSS, Home SubscriberServer) the launch position renewal of home network, and the user data that HSS searches UE sends to MME.

Step 207～212, MME initiate to create the flow process of default bearer, is that UE sets up default bearer by P-GW according to strategy and the charging decision information of PCRF.

Voice bearer is set up between eNodeB and the UE in step 213～215.

Step 216～218, MME notice S-GW is sign, the address of the eNodeB of UE service; If P-GW is not the HSS appointment, MME sends position updating request to HSS so, and notice HSS is the address information of the P-GW that serves of UE, upgrades this information by HSS.

UE initiates the flow process of urgent call in the prior art, as shown in Figure 3, mainly may further comprise the steps:

Step 301, UE initiates urgent call to the EPS network, and urgent call is routed to E-CSCF.

Step 302, E-CSCF is by sending the position enquiring request to LRF, and request LRF is assigned as the PSAP of UE service.

Step 303, LRF sends the position enquiring request to MME, the current location information of inquiry UE.

Step 304, MME obtains user's current location from wireless access network (RAN, Radio Access Network) side, returns to LRF.

Step 305, LRF is that UE distributes PSAP according to the positional information of UE.

Step 306, LRF returns the positional information of UE to E-CSCF, and returns corresponding PSAP address.

Step 307～308, E-CSCF is about to the urgent call route to PSAP, and sets up conversation, until communication process finishes.

Step 309～311, E-CSCF is to the subscription of LRF request to the UE change in location, the response of LRF home position request; LRF also can be to the subscription of MME cancellation to the UE change in location.

Be attached to the EPS network for the UE under the restricted pattern, initiate urgent call after, the EPS network need to allow UE to continue to adhere within a period of time, and is left some urgent resources that UE distributes, such as the default bearer that is used for signaling control etc.That is to say, the EPS network is nullified the behavior of emergency attached UE, need to have the regular hour retardance, and this demand is based on following reason:

A, after UE initiates for the first time urgent call, within the expected time, UE might initiate urgent call again, for fear of the emergency attached that repeats, to the affirmation under the restricted pattern, possible unnecessary steps such as authentication, be necessary to allow UE continue to be attached to the EPS network, and to keep the EPS network be some urgent resources that UE distributes, and processes accelerating;

B, after UE initiates for the first time urgent call, within the expected time, PSAP may this UE of callback, if UE is nullified by the EPS network, then callback can't be carried out.

Yet, for the UE under the restricted pattern, do not need to be attached to the EPS network, because can cause like this waste of resource always yet.For this purpose, the EPS network need to be nullified UE in a period of time after UE uses emergency services.

Be attached to the EPS network about the UE under the restricted pattern, use emergency services after, the problem of how nullifying from the EPS network has following several selection:

A, UE nullify the emergency attached of EPS network voluntarily.UE voluntarily cancellation behavior depends on the exploitation of manufacturer terminal or the requirement of operator.

B, EPS network are initiatively nullified UE adhering to the EPS network.

Yet, because emergency services is different from other business, be non-call charge service, the expectation emergency attached is initiatively nullified and can not be guaranteed to the UE of EPS network.The EPS network is initiatively nullified UE, is often referred to the UE that MME initiatively nullifies emergency attached.But MME initiatively nullifies UE, and need to be arranged a suitable opportunity.Because under prior art, MME can't directly be known initiation, the release movement of the urgent call of IMS operation layer, therefore MME can only rely on other means to nullify the UE of emergency attached, such as: MME requires S-GW/P-GW after a period of time that does not have actual data flow, the active releasing bearing, and then MME nullifies this UE.Perhaps, MME can be undertaken by a cancellation timer is set.Yet available technology adopting is nullified timer and is nullified the UE of emergency attached, can cause following situation to occur: nullify timer time overdue the time UE also just in urgency traffic, thereby nullify operation so that ongoing urgent call is forced to interrupt.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and system of logging off emergency call user, the problem that easily causes urgent call to be interrupted to solve existing cancellation method.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides a kind of method of logging off emergency call user, the method comprises:

To evolved packet system EPS network, and mobile management entity MME is when determining that according to the message that receives the urgent call of described UE finishes in user terminal UE emergency attached, and described MME starts and nullifies timer; The message that receives is to indicate the release message of carrying or idle RRC-IDLE message or the periodicity tracking area update TAU request message of Radio Resource control;

When described MME expires at the cancellation timer, described UE is nullified from the EPS network.

The message of described reception is the release message that indicates carrying, and described startup is nullified timer and is specially:

Described MME determines that according to the described release message that indicates carrying the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

The message of described reception is RRC-IDLE message, and described startup is nullified timer and is specially:

Described MME determines that according to described RRC-IDLE message the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

The message of described reception is periodicity TAU request message, and described startup is nullified timer and is specially:

Described MME determines that according to described periodicity TAU request message the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

After the UE emergency attached arrived the EPS network, the method further comprised:

Described MME starts described cancellation timer after UE emergency attached success, and after indicating load creating and finishing the described cancellation timer of cancellation.

Described establishment and the release that indicates carrying is realized by the control of policy and charging control PCC entity, or is realized by described UE control.

The method further comprises:

Behind the EPS network, described MME will nullify timer and send to described UE by adhering to response in the UE emergency attached;

Described UE starts and nullifies timer when urgent call finishes, and when described cancellation timer expires, nullifies from described EPS network.

The present invention also provides a kind of system of logging off emergency call user, and this system comprises:

User terminal is used for emergency attached to the EPS network, and carries out urgent call;

Mobile management entity is used for being attached to the EPS network at described subscriber terminal emergently, and when determining that according to the message that receives the urgent call of described user terminal finishes, starts and nullify timer; When timer to be nullified expires, described user terminal is nullified from the EPS network; Wherein, the message of described reception is release message or RRC-IDLE message or the periodicity TAU request message that indicates carrying.

Described mobile management entity also is used for after subscriber terminal emergently is attached to the EPS network, and described cancellation timer is sent to described user terminal by adhering to response; Accordingly, described user terminal also is used for starting and nullifying timer when urgent call finishes, and when described cancellation timer expires, nullifies from described EPS network.

The present invention also provides a kind of method that discharges the carrying of urgent call, and the method comprises:

When user terminal UE finishes urgent call, packet data network gateway P-GW discharges voice bearer according to the message of the voice bearer of the release emergency call user that receives, whether the condition that checks the release signaling carrying satisfies, if satisfy, start the cancellation timer that is arranged in P-GW, when nullifying timer time arrival, discharge the signaling bear of described urgent call; Wherein, the condition of described release signaling carrying is: the urgent common data network PDN on the described P-GW connects the GBR carrying that has bit rate to guarantee and all discharges complete.

The message of the voice bearer of the release emergency call user that described P-GW receives is initiated or is initiated from policy and charging control PCC entity from described UE.

Timer is nullified in described startup, and when nullifying timer time arrival, the signaling bear that discharges described urgent call specifically may further comprise the steps:

The cancellation timer starts, and when nullifying timer time arrival, P-GW discharges all non-GBR carryings in this urgent PDN connection, and the mobile management entity MME of notice EPS network is nullified described urgent call.

The present invention also provides a kind of system that discharges the carrying of urgent call, and this system comprises:

User terminal is used for emergency attached to evolved packet system EPS network, and carries out urgent call;

Packet data gateway P-GW, be used for being attached to the EPS network at described subscriber terminal emergently, if satisfy the condition of release signaling carrying, then start the cancellation timer that is arranged in P-GW, when nullifying timer time arrival, discharge the signaling bear of described urgent call;

Wherein, the condition of described release signaling carrying is: the urgent common data network PDN on the described P-GW connects the GBR carrying that has bit rate to guarantee and all discharges complete.

The method and system of a kind of logging off emergency call user provided by the present invention, to the EPS network, and MME is when determining that according to the message that receives the urgent call of UE finishes in the UE emergency attached, and MME starts and nullifies timer, and when the cancellation timer expires, UE is nullified from the EPS network.By the present invention, solved the problem that existing cancellation method easily causes urgent call to be interrupted; And the present invention can release the urgent call resource of distributing to UE after the sentence expires, if to guarantee that for the second time urgent call of UE initiation need not to repeat the processes such as emergency attached within the expected time; The present invention also so that within the expected time this UE of EC callback can realize, be unlikely to can't callback UE situation.

Description of drawings

Fig. 1 is the Organization Chart that UE carries out the EMC business in the prior art by access SAE network;

Fig. 2 is the flow chart that UE sets up emergency bearing in the prior art;

Fig. 3 is the flow chart that UE initiates urgent call in the prior art;

Fig. 4 is the method flow diagram of a kind of logging off emergency call user of the present invention;

Fig. 5 is the cancellation method flow chart of the embodiment of the invention one;

Fig. 6 is the cancellation method flow chart of the embodiment of the invention two;

Fig. 7 is the cancellation method flow chart of the embodiment of the invention three;

Fig. 8 is the cancellation method flow chart of the embodiment of the invention four;

Fig. 9 is the cancellation method flow chart of the embodiment of the invention five;

Figure 10 is the cancellation method flow chart of the embodiment of the invention six;

Figure 11 is the composition structural representation of the system of a kind of logging off emergency call user of the present invention;

Figure 12 is P-GW of the present invention by the cancellation timer is set, and nullifies the flow chart of the UE of emergency attached to trigger MME.

Embodiment

The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.

The method of a kind of logging off emergency call user provided by the present invention as shown in Figure 4, mainly may further comprise the steps:

Step 401, to the EPS network, and MME is when determining that according to the message that receives the urgent call of UE finishes in the UE emergency attached, MME starts and nullifies timer.

The message that indication MME receives among the present invention can be the release message that indicates carrying, also can be the free time (RRC-IDLE of Radio Resource control, Radio Resource Control IDLE) message, it can also be periodicity tracking area update (TAU, Tracking Area Update) request message.Certainly, message of the present invention is not limited in above-mentioned the act, and the message for after can being defined as the UE urgent call and finishing of other types also belongs to invention which is intended to be protected.

Nullify timer and be pre-configured on the MME, and the duration of cancellation timer can arrange according to actual needs.

Step 402 when MME expires at the cancellation timer, is nullified UE from the EPS network.

Behind the duration of having waited for the cancellation timer, MME is released to the emergency bearing that UE distributes, and comprises that notice eNodeB discharges the connection of eating dishes without rice or wine of UE, thereby UE is nullified from the EPS network.

The below is take the release message that indicates carrying as example, above-mentioned cancellation method is described in detail, as shown in Figure 5, has disposed dynamic PCC among this embodiment, the establishment and the release that namely indicate carrying are to be realized by the control of PCC entity, and the cancellation method of this embodiment mainly may further comprise the steps:

Step 501, UE sends emergency attached request to the EPS network, and this emergency attached request is delivered to MME.

Step 502, MME is that UE creates the default bearer that is used for urgent call, this carrying is mainly used in signaling control.The constructive process of default bearer is prior art, does not repeat them here.

After step 503, default bearer created and finish, MME sent to UE and adheres to response.

Step 504, MME starts the cancellation timer to this emergency attached UE after adhering to response to the UE transmission.

Step 505, UE initiates the urgent call of SIP to P-CSCF/E-CSCF, and consults the necessary informations such as medium type by P-CSCF/E-CSCF with the calling opposite end.

Step 506, after UE carried out media negotiation with the calling opposite end, P-CSCF was according to the result who consults, and indication PCRF is that UE sets up the corresponding carrying that indicates; PCRF is according to the configuration data of urgent call, and the suitable policy data of make a strategic decision (such as: the QoS grade that is used for urgent call), granting is carried out to P-GW; P-GW carries out the strategy that PCRF issues, and creates the corresponding carrying that indicates, and by S-GW this establishment event that indicates carrying is carried to indicate in the load creating message and reports MME.In the establishment event that reports to MME, carry the sign this indicate the carrying be the identification information that creates for urgent call.

Step 507, MME receive that P-GW reports by S-GW indicate the load creating event after, judge that according to the identification information that reports this indicates carrying and creates as urgent call, and detecting this, to indicate the associated UE of carrying be the UE of emergency attached, or the UE under the restricted pattern; And then check for this UE has started the cancellation timer, and carry out the cancellation operation of this cancellation timer.

In this step, the information such as emergency call level after the urgent APN that MME provides in the time of can be according to the UE emergency attached or the UE emergency attached in the contextual qos parameter of MME set urgent sign or UE in the context of this UE determine that this UE is the UE of an emergency attached.MME can be according to the current region of UE, and whether is positioned at the restricted area from definite UE such as restricted area tabulation that HSS issues.MME also can after initial decision UE be restricted, arrange a restricted sign and show that this UE is a UE under the restricted pattern in the context of UE.

It is pointed out that in step 504, to start the cancellation timer, initiate not success of urgent call even can guarantee follow-up UE, and indicate establishment and the not generation of dispose procedure of carrying, also can guarantee by the timer that step 504 arranges UE deregistration to be fallen.And in step 507, cancel corresponding cancellation timer, can guarantee that the timer that starts can not interrupt the ongoing long urgent call of UE, is not limited so that the duration of timer does not nullify in the urgency traffic of UE in step 504.

Urgency traffic is set up between UE and the calling opposite end, until urgency traffic finishes in step 508～509.

Step 510, after the urgency traffic of UE and calling opposite end finished, P-CSCF was according to the indication of SIP signaling, and requiring PCRF is the carrying that indicates that is used for urgent call that UE discharges aforementioned foundation; PCRF is according to the indication of P-CSCF, and urgent call and indicate the binding relationship of carrying, requires P-GW to discharge the aforementioned carrying that indicates for UE foundation; P-GW discharges the corresponding carrying that indicates, and by S-GW this release event that indicates carrying is carried to indicate in the carrying release message and reports MME.In the release event that indicates carrying that reports, have enough information and can allow the MME can be according to the bearer context of the UE that preserves, identifying this, to indicate carrying be to create for urgent call.

Step 511, MME receive that P-GW reports by S-GW indicate the carrying release event after, judge that according to the information that reports and the contextual information of the UE that self stores this indicates carrying and creates as urgent call, and detecting this, to indicate the associated UE of carrying be the UE of emergency attached, or the UE under the restricted pattern; And then check for this UE has cancelled the cancellation timer, and again start the cancellation timer for this UE.

Step 512, when the upper cancellation timer that arranges of MME expired, MME determined to nullify the UE of this emergency attached.

Step 513, MME notice S-GW/P-GW is released to the emergency bearing that UE distributes.

Step 514, MME nullifies UE, comprises that notice eNodeB discharges the connection of eating dishes without rice or wine of UE.

In the embodiment of the invention shown in Figure 5, be responsible for UE and set up that to indicate carrying be dynamic PCC, MME can when receiving the foundation that indicates carrying that distributes for UE, release message, according to circumstances determine to start or cancel the cancellation timer of this UE in the case.

When only using static PCC, UE will control voluntarily and set up the carrying that indicates that is used for urgent call, and UE deregistration method in this case as shown in Figure 6.Embodiment illustrated in fig. 6 two and embodiment illustrated in fig. 5 one difference only is to indicate establishment, the dispose procedure of carrying and is initiated by UE.When UE initiates urgent call, according to the 200OK message of SIP session, require the EPS network creation to indicate carrying; When urgent call discharges, according to the BYE message of SIP session, require the EPS network to discharge and indicate carrying.

The difference of flow process shown in Figure 6 and Fig. 5 is:

Step 606, UE initiates to indicate the foundation request of carrying to MME after carrying out media negotiation with the calling opposite end; MME requires S-GW/P-GW to create and indicates accordingly carrying according to the configuration of self urgent call policy data.

Step 610, UE according to the BYE indication of SIP session, requires MME to discharge the carrying that indicates of aforementioned foundation after urgent call finishes, and MME further requires S-GW/P-GW to discharge and indicates accordingly carrying.

Other operating procedures and the corresponding operating among Fig. 5 among Fig. 6 are similar, do not repeat them here.

By Fig. 5 and flow process shown in Figure 6, MME can according to circumstances obtain notice when the message of receiving as the foundation that indicates carrying that UE distributes, release, and then according to UE whether emergency attached or restricted pattern whether, and whether be that UE has started the situation of nullifying timer, determine to start or cancel the cancellation timer of this UE.

UE is in connection status (EMM-CONNECTED) in the urgency traffic process of reality; Inertia after the UE urgency traffic finishes a period of time will change idle condition (EMM-IDLE) over to.This conversion from the connection status to the idle condition, its time is to be controlled by the timer that a connection status that arranges at UE turns idle condition.Thereby MME can be transformed into this information of idle condition by connection status according to UE and determine that the urgent call of UE finishes, and then opens and nullify timer, and is nullifying timer to after date cancellation UE.In this process, MME can according to the RRC-IDLE message that receives, know that UE is transformed into idle condition by connection status.Concrete UE deregistration flow process as shown in Figure 7, mainly may further comprise the steps:

Step 701, UE emergency attached create default bearer to the EPS network.

Step 702, UE initiates urgent call, until end of conversation.

Step 703, UE changes idle condition over to from connection status after finishing urgent call a period of time, and eNodeB knows that UE enters idle condition.

Step 704, eNodeB sends RRC-IDLE message to MME, and this UE of notice MME enters idle condition.

Step 705, MME is after receiving RRC-IDLE message, UE corresponding to detect-message is the UE of emergency attached, or the UE under the restricted pattern, and starts the cancellation timer for this UE.

Step 706～708, after a period of time, the cancellation timer of this UE expires, and MME is released to the emergency bearing that UE sets up, and UE is nullified from the EPS network.

MME can also according to the periodicity TAU request message that receives, know that UE is transformed into idle condition by connection status in actual applications.Corresponding UE deregistration flow process, as shown in Figure 8, embodiment illustrated in fig. 8 four and embodiment illustrated in fig. 7 three difference is that MME waits the RRC-IDLE message that eNodeB sends, but wait UE after entering idle condition, when periodically sending the TAU request message, according to starting cancellation timer for UE with the similar method of Fig. 7, and nullifying timer to after date cancellation UE.

In addition, as another kind of realization the of the present invention, after MME received the periodicity TAU request message that UE sends, MME can not arrange and nullify timer and directly nullify this UE, and the specific implementation flow process as shown in Figure 9.The reason of doing like this is based on: UE enters idle condition from connection status the regular hour, this time is timer-operated by one, suppose that this time can satisfy the demand of extension logging off users in the urgent call, then can after receiving the TAU request that UE sends, just nullify this UE.Embodiment illustrated in fig. 9 five essence is the cancellation timer that MME is not provided for logging off emergency call UE specially, but realizes identical purpose by using UE from the timer that connection status enters idle condition.

According to the UE that arranges to nullify emergency attached that nullifies timer, can adopt implicit expression to nullify by MME.So-called implicit expression is nullified, and refers to that the behavior of MME cancellation UE is not notified to UE.MME indication eNodeB is released to the interface-free resources that UE distributes, but eNodeB does not send logout message to UE.

When the method that adopts implicit expression to nullify was nullified UE, because UE does not receive logout message, so the state of the state safeguarded of UE self and network reality was inconsistent.It is the problem of network signal quality that this situation may cause UE to think by mistake, and again attempts being attached to network, thus the resource of waste UE and network.

For this problem, the cancellation timer that embodiments of the invention six provide a kind of UE to send according to MME is carried out the method for the EPS network cancellation of self, as shown in figure 10, mainly may further comprise the steps:

Step 1001, UE sends emergency attached request to MME.

Step 1002, MME is that UE creates default bearer.

Step 1003, MME sends to UE and adheres to response, and adheres at this and to carry the cancellation timer in response.This duration of nullifying timer can be consistent with the cancellation timer of MME, also can be different.

Step 1004, MME can according to network strategy, after UE adheres to successfully, nullify timer for this UE starts, and timer be nullified in cancellation after establishment indicates carrying.

Step 1005, UE initiates urgent call, after conversation a period of time, finishes urgent call.

Step 1006, MME restarts the cancellation timer in the situation that know the UE urgency traffic and finish, and when nullifying timer and expire, is released to the emergency bearing that UE distributes, and nullifies UE.

Step 1007 when the UE urgent call finishes, according to the BYE message of SIP session, starts and nullifies timer.

Step 1008, the cancellation timer on UE are initiatively initiated to nullify by UE to after date.

It is pointed out that if also be provided with the cancellation timer on the MME, and the cancellation timer of MME works first, then the MME method that can adopt implicit expression to nullify is nullified this UE; UE nullifies voluntarily subsequently, can be canceled with the status modifier of self.

Further, at UE the cancellation timer is set and also has such effect: if UE is currently located at restricted residential quarter, be in the emergency attached state, when UE moves to normal residential quarter, because UE is current to be the emergency attached state, even UE has found new residential quarter, can initiatively not initiate to nullify emergency attached yet, initiate again the process of normally adhering to.The setting of timer has guaranteed that UE moves to normal cell after a period of time, thereby UE can normally adhere to enjoy normal service from the state cancellation of emergency attached.If UE always moves around between a restricted cell and normal cell, then the upper set timer of UE can be avoided the frequent ping-pong that switches.

In order when guaranteeing that UE switches to normal cell from restricted residential quarter, to initiate normally to adhere to just be unlikely to wait for long time, the upper set cancellation timer of UE can be suitably less than the set cancellation timer of network.Can limit further this cancellation timer starts in the time of the UE emergency attached, when UE moves to new residential quarter and timer trigger the UE deregistration emergency attached and initiate to after date and normally adhere to, thereby so that after UE moves to new normal cell from restricted residential quarter, can switch to faster normal modes of attachment.And rest on the situation of same residential quarter (restricted residential quarter) for UE always, and nullifying timer to after date, UE only nullifies emergency attached, and does not attempt again to initiate emergency attached.

For realizing the method for the invention described above logging off emergency call user, the present invention also provides a kind of system of logging off emergency call user, and as shown in figure 11, this system is comprised of user terminal 10 and mobile management entity 20.Wherein, user terminal 10 is used for emergency attached to the EPS network, and carries out urgent call.Mobile management entity 20 is used in user terminal 10 emergency attached to the EPS network, and when determining that according to the message that receives the urgent call of user terminal 10 finishes, starts and nullify timer; When timer to be nullified expires, user terminal 10 is nullified from the EPS network.The message that mobile management entity 20 receives among the present invention is release message or RRC-IDLE message or the periodicity TAU request message that indicates carrying.

In addition, mobile management entity 20 also is used in user terminal 10 emergency attached behind the EPS network, will nullify timer and send to user terminal 10 by adhering to response; Accordingly, user terminal 10 also is used for when urgent call finishes, and starts and nullifies timer, and when the cancellation timer expires, nullify from the EPS network.

In addition, as another kind of embodiment the of the present invention, the cancellation timer in order to control and triggering Logout Events also can be arranged on the P-GW.

The using method of nullifying timer is set on the P-GW, can be the operating position that P-GW detects the GBR carrying of UE, and when these GBR carryings all had been released, timer was nullified in the P-GW startup.Because under the urgent call, the GBR carrying is generally used for voice bearer, therefore checks the operating position of GBR carrying, can be understood as the operating position that checks voice bearer, checks namely whether urgent call finishes.When nullifying timer to after date, P-GW discharges the non-GBR carrying of this UE, because non-GBR carrying is generally used for signaling bear, and the release of carrying will be notified MME, after MME receives the carrying release message, MME detects this UE without any beared information (signaling bear-non-GBR carrying, voice bearer-GBR carrying), connects thereby discharge this PDN, further triggers the Logout Events for this UE.

Figure 12 has described above-mentioned P-GW by the cancellation timer is set, and nullifies the method for the UE of emergency attached to trigger MME.

Step 1201, UE emergency attached create default bearer to the EPS network;

Step 1202, UE initiates urgent call, until end of conversation;

Step 1203, UE or PCRF notice P-GW discharge the voice bearer of urgent call, and the notified rear release of P-GW is carried accordingly.When having dynamic PCC, P-CSCF discharges this voice bearer by PCRF notice P-GW; When not having dynamic PCC, UE notice P-GW discharges this voice bearer.

Step 1204, whether P-GW is according to existing the GBR carrying to judge whether urgency traffic finishes in the urgent PDN connection: when receiving the carrying releasing request message in 1203 steps, P-GW checks the GBR carrying quantity in the urgent PDN connection, when P-GW detected in the urgent PDN connection GBR carrying and all discharges, P-GW was that UE starts the cancellation timer that connects for this PDN.

Step 1205, when nullifying timer and expire, P-GW discharges that all non-GBR carry in this urgent PDN connections, and and then triggers the release of this urgent PDN connection.These d/d non-GBR carry normally signaling bear.

Step 1206, P-GW discharges non-GBR carrying to the MME notice; MME judges that all carryings in the urgent PDN connection all are released, and MME discharges this urgent PDN and connects.

Step 1207 connects all release if MME detects all PDN of this UE, and MME triggers for the implicit expression of this UE and nullifies, thereby namely can UE be nullified from network the obstructed UE of knowing;

Step 1208, alternatively, MME is by this Logout Events of space interface signaling notice UE.

At the cancellation timer that P-GW arranges, its value can be when UE initially adheres to MME require S-GW/P-GW to pass to P-GW when UE creates default bearing, also can be arranged voluntarily by P-GW, perhaps arrange by operation maintenance system.

The present invention also discloses a kind of system of logging off emergency call user, and this system comprises:

User terminal is used for emergency attached to the EPS network, and carries out urgent call; Packet data gateway P-GW is used for being attached to the EPS network at described subscriber terminal emergently, if satisfy, starts the cancellation timer that is arranged in P-GW, when nullifying timer time arrival, discharges the signaling bear of described urgent call.

The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.

Claims (13)

1. the method for a logging off emergency call user is characterized in that, the method comprises:

To evolved packet system EPS network, and mobile management entity MME is when determining that according to the message that receives the urgent call of described UE finishes in user terminal UE emergency attached, and described MME starts and nullifies timer; The message that receives is to indicate the release message of carrying or idle RRC-IDLE message or the periodicity tracking area update TAU request message of Radio Resource control;

When described MME expires at the cancellation timer, described UE is nullified from the EPS network.

2. the method for described logging off emergency call user according to claim 1 is characterized in that, the message of described reception is the release message that indicates carrying, and described startup is nullified timer and is specially:

Described MME determines that according to the described release message that indicates carrying the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

3. the method for described logging off emergency call user according to claim 1 is characterized in that, the message of described reception is RRC-IDLE message, and described startup is nullified timer and is specially:

Described MME determines that according to described RRC-IDLE message the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

4. the method for described logging off emergency call user according to claim 1 is characterized in that, the message of described reception is TAU request message periodically, and described startup is nullified timer and is specially:

Described MME determines that according to described periodicity TAU request message the urgent call of described UE finishes, and is emergency attached or when being in restricted pattern at definite described UE, starts the cancellation timer.

5. according to claim 1 or the method for 2 or 3 or 4 described logging off emergency call user, it is characterized in that, after the EPS network, the method further comprises in the UE emergency attached:

Described MME starts described cancellation timer after UE emergency attached success, and after indicating load creating and finishing the described cancellation timer of cancellation.

6. the method for described logging off emergency call user according to claim 5 is characterized in that, described indicate the establishment of carrying and discharge by the control of policy and charging control PCC entity realize, or realized by described UE control.

7. the method for a logging off emergency call user is characterized in that, the method further comprises:

Behind evolved packet system EPS network, mobile management entity MME will be nullified timer and be sent to described UE by adhering to response in user terminal UE emergency attached;

Described UE starts and nullifies timer when urgent call finishes, and when described cancellation timer expires, nullifies from described EPS network.

8. the system of a logging off emergency call user is characterized in that, this system comprises:

User terminal is used for emergency attached to evolved packet system EPS network, and carries out urgent call;

Mobile management entity is used for being attached to the EPS network at described subscriber terminal emergently, and when determining that according to the message that receives the urgent call of described user terminal finishes, starts and nullify timer; When timer to be nullified expires, described user terminal is nullified from the EPS network; Wherein, the message that receives is to indicate the release message of carrying or idle RRC-IDLE message or the periodicity tracking area update TAU request message of Radio Resource control.

9. the system of described logging off emergency call user according to claim 8 is characterized in that, described mobile management entity also is used for after subscriber terminal emergently is attached to the EPS network, and described cancellation timer is sent to described user terminal by adhering to response; Accordingly, described user terminal also is used for starting and nullifying timer when urgent call finishes, and when described cancellation timer expires, nullifies from described EPS network.

10. method that discharges the carrying of urgent call, the method comprises:

When user terminal UE finishes urgent call, packet data network gateway P-GW discharges voice bearer according to the message of the voice bearer of the release emergency call user that receives, whether the condition that checks the release signaling carrying satisfies, if satisfy, start the cancellation timer that is arranged in P-GW, when nullifying timer time arrival, discharge the signaling bear of described urgent call;

Wherein, the condition of described release signaling carrying is: the urgent common data network PDN on the described P-GW connects the GBR carrying that has bit rate to guarantee and all discharges complete.

11. method according to claim 10 is characterized in that, the message of the voice bearer of the release emergency call user that described P-GW receives is initiated or is initiated from policy and charging control PCC entity from described UE.

12. according to claim 10 or 11 described methods, it is characterized in that, timer is nullified in described startup, and when nullifying timer time and arrive, the signaling bear that discharges described urgent call specifically may further comprise the steps:

The cancellation timer starts, and when nullifying timer time arrival, P-GW discharges all non-GBR carryings in this urgent PDN connection, and the mobile management entity MME of notice EPS network is nullified described urgent call.

13. a system that discharges the carrying of urgent call is characterized in that, this system comprises:

User terminal is used for emergency attached to evolved packet system EPS network, and carries out urgent call;

Packet data gateway P-GW, be used for being attached to the EPS network at described subscriber terminal emergently, if satisfy the condition of release signaling carrying, then start the cancellation timer that is arranged in P-GW, when nullifying timer time arrival, discharge the signaling bear of described urgent call;

Wherein, the condition of described release signaling carrying is: the urgent common data network PDN on the described P-GW connects the GBR carrying that has bit rate to guarantee and all discharges complete.

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