CN101540979B

CN101540979B - Emergency bearing-establishing method and communication system for emergency call service

Info

Publication number: CN101540979B
Application number: CN2008101023325A
Authority: CN
Inventors: 习建德; 徐晖
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2008-03-20
Filing date: 2008-03-20
Publication date: 2011-07-27
Anticipated expiration: 2028-03-20
Also published as: CN101540979A

Abstract

The invention provides an emergency bearing-establishing method for emergency call service. The method comprises the following steps that: after IP-CAN receives an emergency-call request message sent by UE, partial or all resources occupied by PDN connection belonging to the UE are released; the emergency-call request message carries a UE identifier and an emergency-call number; the IP-CAN establishes a bearing path for the emergency bearing the UE and a PDN network providing the emergency call service corresponding to the emergency-call number, and allocates the released resources to the emergency bearing; and the emergency bearing is used for bearing service data of the emergency call service. The invention also provides a communication system. The technical proposal of the invention realizes the emergency call service of users under the circumstance that the resources occupied by the users are limited.

Description

The emergency bearing-establishing method and the communication system that are used for emergence call service

Technical field

The present invention relates to the mobile communication technology field, relate in particular to a kind of emergency bearing-establishing method and communication system that is used for emergence call service.

Background technology

Emergence call service is mainly used in the user and meets with predicament as suffering artificial attack, fire, sick when sending out or the like incident, can pre-empt resources, relevant treatment unit sends urgent call to incident, so that the user gets in touch with relevant unit as early as possible, and obtains relief.

In third generation collaborative project (3GPP) system, network side provides emergence call service in circuit switching (CS) territory for the user.The continuous development of the communication technology is advancing the continuous evolution of communication system architecture, communication service based on the CS territory is substituted by the communication service based on packet switching (PS) territory gradually, IP connects access network (IP-Connectivity Access Network, IP-CAN) communication system that constitutes with packet data network (PDN, Packet Data Network) can provide the communication service based on the PS territory.Current, IP-CAN network such as general packet radio service (GPRS, General Packet RadioService) grouping system of network, evolution (EPS, Evolved Packet System), code division multiple access (CDMA, Code-Division Multiple Access) 2000 networks etc.; PDN network such as IP Multimedia System (IMS, IP Multimedia Subsystem) network, packet-switched services (PSS, Packet Switched Service) network etc.

Referring to Fig. 1, Fig. 1 is existing compatible GPRS network and EPS network architecture schematic diagram.The main node that embodies comprises subscriber equipment (UE) among Fig. 1, the Access Network of EPS network (E-UTRAN), Mobility Management Entity (MME, Mobility Management Entity), user's subscribed services device (HSS), gateway (S-GW, Serving GW), grouped data network gateway (PDN GW, PDN Gateway), strategy and charging rule functions (PCRF, Policy and Charging RulesFunction), Serving GPRS Support Node (SGSN, Serving GPRS Support Node), and the access network (RAN) that comprises UTRAN and GERAN in the gprs system.For the UE that supports different system, as supporting the UE of 3G/2G system, can pass through the RAN connecting system, and it be carried out mobile management by SGSN, set up UE and be connected with PDN between the PDN network; UE for supporting the LTE system can pass through the E-UTRAN connecting system, and by MME it be carried out mobile management, sets up UE and sets up UE and be connected with PDN between the PDN network.Usually, also claim UE to be connected with the PDN that is connected between the PDN GW.

The user of PS territory registration when commencing business, be connected with PDN between the PDN GW based on UE, and carry out data interaction between the PDN network.For how in the PS territory, to carry out emergence call service, the default bearing that prior art proposes to utilize UE to be set up in the attaching process of PS territory provides emergence call service, or utilize the dedicated bearer in the IP-CAN network to set up emergency bearing, Deng, and specifically how in the PS territory, to set up emergency bearing, existing standard does not provide relevant solution as yet, further, for the registered user who is attached to the PS territory, if its shared resource reaches signatory restriction, and the user expects to carry out emergence call service because of meeting with bursty state, but can take resource-constrained because of it, to be difficult to carry out emergence call service, thereby may cause user's person or property impaired.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of emergency bearing-establishing method and communication system that is used for emergence call service,, under the shared resource-constrained situation of user, realize user's emergence call service for the user in PS territory

A kind of emergency bearing-establishing method that is used for emergence call service comprises:

A, Internet protocol connect access network IP-CAN after receiving the emergency call request message that UE initiates, and discharge the PDN that belongs to described UE and connect shared part or all of resource; Carry UE sign and emergency telephone number in the described emergency call request message;

B, described IP-CAN set up described UE and the bearer path of the emergency bearing between the PDN network of the pairing emergence call service of described emergency telephone number are provided, and give described emergency bearing with d/d resource allocation, described emergency bearing is used to carry the business datum of described emergence call service.

Preferably, IP-CAN discharges described part or all of resource and comprises:

IP-CAN receives the message of the request release appointment PDN connection of UE transmission, discharges the bearing identification of the described PDN of the appointment connection of carrying in the message of appointment PDN connection according to this request, discharges described appointment PDN and connects; Or,

After described IP-CAN received described emergency call request message, the QoS according to professional in the PDN connection that belongs to described UE selected d/d resource.

Preferably, IP-CAN receives that the emergency call request message that UE initiates comprises:

Described IP-CAN receives that the PDN that UE sends connects the release request message, and described PDN connects in the release request message and comprises described emergency call request message.

Preferably, described PDN connects and further comprises former because set up described emergency bearing that release PDN connects in the release request message.

Preferably, release portion or whole resource comprise:

Release belongs to whole resources of one or more PDN connections of described UE; Or,

Release belongs to the part resource in the PDN connection of described UE.

Preferably, described IP-CAN sets up described bearer path and comprises:

Among the described IP-CAN, after mobile management nodes is received described emergency call request message, for described emergence call service distributes PDN GW address, send establishment emergency bearing request message to gateway Serving GW, carry UE sign, emergency bearing sign, urgent APN, the emergency bearing described PDN GW address corresponding, the address and the Tunnel Identifier of described mobile management nodes in the described establishment emergency bearing request message with described PDN GW address;

Described Serving GW receives described establishment emergency bearing request message, the information that storing and resolving goes out, and according to described PDN GW address, with mutual control plane address and the Tunnel Identifier separately of described PDN GW, and separately user's face address and Tunnel Identifier;

Described Serving GW is by described mobile management nodes, with mutual control plane address and the Tunnel Identifier separately of wireless access control equipment, and separately user's face address and Tunnel Identifier.

Preferably, described mobile management nodes is that described emergence call service distributes PDN GW address to comprise:

Described mobile management nodes finds urgent APN according to the emergency telephone number that carries in the described emergency call request message, according to described urgent APN, finds PDN GW address; Or,

Also comprise described urgent APN in the described emergency call request message, described mobile management nodes finds described PDN GW address according to described urgent APN.

Preferably, mutual control plane address and the Tunnel Identifier separately of described Serving GW and described PDN GW, and separately user's face address and Tunnel Identifier comprise:

Described Serving GW sends to described PDN GW and creates the emergency bearing request message, carries user's face address and the Tunnel Identifier of the control plane address of UE sign, emergency bearing sign, the urgent APN of described PDN GW address correspondence, described Serving GW and Tunnel Identifier, described Serving GW in this establishment emergency bearing request message;

Described PDN GW receives the establishment emergency bearing request message that described Serving GW sends, the information that storing and resolving goes out, return to described Serving GW and to create the emergency bearing response message, carry in this establishments emergency bearing response message that UE sign, emergency bearing identify, user's face address and the Tunnel Identifier of the control plane address of described PDN GW and Tunnel Identifier, described PDN GW;

Described Serving GW receives and resolves the establishment emergency bearing response message that described PDN GW sends, and stores the control plane address of described PDN GW and user's face address and the Tunnel Identifier of Tunnel Identifier and described PDN GW.

Preferably, after described PDN GW received the establishment emergency bearing request message of described Serving GW transmission, this method further comprised:

Described PDN GW is that described UE distributes this UE to be used for PDN address with described PDN network interaction, with described PDN address, sends to described UE by described IP-CAN.

Preferably, described Serving GW is by described mobile management nodes, and with mutual control plane address and the Tunnel Identifier separately of wireless access control equipment, and separately user's face address and Tunnel Identifier comprise:

Described Serving GW returns to described mobile management nodes and creates the emergency bearing response message, carries user's face address and the Tunnel Identifier of UE sign, emergency bearing sign, described Serving GW in this establishment emergency bearing response message;

After described mobile management nodes is received the establishment emergency bearing response message that described Serving GW returns, send carrying to wireless access control equipment and set up request message, user's face address and the Tunnel Identifier that carries UE sign, emergency bearing sign, described Serving GW in the request message set up in this carrying;

Described wireless access control equipment receives the carrying of described mobile management nodes transmission and sets up request message, user's face address and the Tunnel Identifier of the described Serving GW that storing and resolving goes out send to described Serving GW with self user's face address and Tunnel Identifier by mobile management nodes;

Described Serving GW stores the user's face address and the Tunnel Identifier of described wireless access control equipment.

Preferably, described IP-CAN comprises to described emergency bearing d/d resource allocation:

Described wireless access control equipment sends to described UE and requires UE to reshuffle the reallocation message of wireless connections, and this requires UE to reshuffle in the reallocation message of wireless connections the resource information of carrying UE sign, emergency bearing sign, being used for wireless connections;

After described UE receives described reallocation message, carry out radio configuration according to described resource information.

Preferably, further carry the upstream data map information that UE is used for the mapping uplink data in the described reallocation message, after described UE received described reallocation message, this method further comprised:

Described UE determines the business datum of emergence call service is mapped on the indicated emergency bearing of emergency bearing sign.

Preferably, after the described step B, this method further comprises:

Utilize the emergency bearing that is established between described UE and the described PDN network, transmit the business datum of described emergence call service.

A kind of communication system comprises: IP-CAN, UE and PDN network, wherein,

UE sends emergency call request message to IP-CAN, carries UE sign and emergency telephone number in this message;

IP-CAN, after receiving the emergency call request message of UE initiation, the PDN that release belongs to described UE connects shared part or all of resource, set up described UE and the bearer path of the emergency bearing between the PDN network of the pairing emergence call service of described emergency telephone number is provided, and give described emergency bearing with d/d resource allocation, described emergency bearing is used to carry the business datum of described emergence call service;

The PDN network utilizes the emergency bearing that is established, and transmits the business datum of emergence call service between the UE.

In the described communication system, among the described IP-CAN, after mobile management nodes is received described emergency call request message, for described emergence call service distributes PDN GW address, send to create the emergency bearing request message to gateway Serving GW, carry UE sign, emergency bearing sign, urgent APN, the emergency bearing described PDN corresponding in the described establishment emergency bearing request message with described PDN GW address

The address of GW address, described mobile management nodes and Tunnel Identifier;

In the described communication system, described wireless access control equipment sends to described UE and requires UE to reshuffle the reallocation message of wireless connections, and this requires UE to reshuffle in the reallocation message of wireless connections the resource information of carrying UE sign, emergency bearing sign, being used for wireless connections;

Technique scheme provided by the invention, user for the PS territory, for under the shared resource-constrained situation of user, realize emergence call service, by discharging the part or all of resource of CU, satisfy and set up the emergency bearing resource requirement, make the user can in time carry out emergence call service, obtain timely relief, thereby retrieve its loss as far as possible.

Description of drawings

Fig. 1 is existing compatible GPRS network and EPS network architecture schematic diagram;

Fig. 2 is the structural representation of communication system among the present invention;

Fig. 3 is a flow chart of realizing user's emergence call service in the embodiment of the invention one in the PS territory;

Fig. 4 is a flow chart of realizing user's emergence call service in the embodiment of the invention two in the PS territory.

Embodiment

Among the present invention, if the shared resource of user in the registration of PS territory reaches limits value, for making the user can in time carry out emergence call service, by discharging the part or all of resource of CU, and foundation in time is used for the emergency bearing of emergence call service, realize user's urgent call, make the user obtain relief as early as possible.

Among the present invention, the way of setting up emergency bearing mainly comprises: IP-CAN is after receiving the emergency call request message that UE sends, according to the UE sign of carrying in this message, one or several PDN that release belongs to UE connects, or the part resource in single PDN connection, giving emergency bearing as resource allocations such as time slot, code channels with d/d, and the bearer path of setting up emergency bearing between the PDN network of the UE emergence call service corresponding with this emergency telephone number is provided.Based on the emergency bearing that is established, comprise bearer path and the resource of being distributed, between UE and the PDN network, but the business datum of the emergence call service of interactive user.

In addition, among the present invention, can be after receiving the emergency call request that UE sends by network side, according to service quality (QoS) professional in the PDN connection that belongs to UE, select the part or all of resource of the PDN connection of release UE, also can by the user when needs are initiated emergency call request, initiatively select request to discharge some resource, as discharge certain PDN connection by UE.

For making technical scheme of the present invention and advantage clearer, describe in further detail with accompanying drawing below in conjunction with specific embodiments.

Referring to Fig. 2, Fig. 2 is the structural representation of communication system involved in the present invention, comprises IP-CAN, UE and PDN network in this communication system, wherein,

Embodiment one:

Connect the release flow process based on existing PDN, carry out the flow process of setting up of emergency bearing.Wherein, establish and establish a plurality of PDN between UE and the network side and be connected, UE has and selects to discharge the ability that certain PDN connects, and in the present embodiment one, the IP-CAN network is EPS, and mobile management nodes is MME, and wireless access control equipment is eNB.

Referring to Fig. 3, Fig. 3 is a flow chart of realizing user's emergence call service in the present embodiment one in the PS territory, and this flow process may further comprise the steps:

Step 301, UE send PDN by eNB to MME and connect release request (PDNDisconnection Request) message, carry emergency call request message in this release request message.

The default bearing that the PDN of this step 301 connects and also comprise the UE sign in the release request message, asks a PDN of release to connect identifies (LBI).Emergency telephone numbers such as portability such as fire alarm, UE sign in the emergency call request message.The UE sign can be IMSI or GUTI.

In the present embodiment one, the APN (Emergency APN) that also comprises emergence call service in this emergency call request message, based on the ability of existing MME, MME can select a PDN GW that the path is nearer according to the position of Emergency APN and known UE thereof.In the practical application, if do not carry urgent APN in the emergency call request message, then MME can select an Emergency APN who is responsible for handling emergence call service according to emergency telephone number, and can select the PDN GW that the path is nearer based on urgent APN.

PDN connects to discharge can further carry in the request message asks to discharge the reason that PDN connects, as emergency call request, so that the emergency bearing that will set up can be assigned to higher priority, go back the sign (PTI) of this emergency call request message of portability, the PDN address assignment parameter (PDN AddressAllocation) of UE.

PDN address assignment parameter is that UE divides the IP address that is used in urgent call by UE request network side, can be used for indicating the type of network address of this UE support, as IPv4 address and/or IPv6 address.In the practical application, if do not carry PDN address assignment parameter in the emergency call request message, the emergency bearing that can finish based on foundation between then follow-up UE and the PDN network obtains its PDN address by UE from PDN GW.

In addition, in the practical application, connect, then can connect to discharge to carry in the request message and ask a plurality of PDN that discharge to connect default bearing identification list (LBI list) at PDN if will discharge a plurality of PDN.

Step 302, MME resolve PDN and connect the release request message, and parse emergency call request message wherein, send deleting bearing request (Delete Bearer Request) message and create emergency bearing request (Create Emergency Bearer Request) message to Serving GW.

The LBI that can comprise the PDN connection of UE sign, request release in the deleting bearing request message.

Create and to comprise the UE sign in the emergency bearing request message, emergency bearing sign (Emergency Bearer ID) to be set up, Emergency APN, the address of the PDN GW that MME selects, the address of MME and Tunnel Identifier also can further comprise the service quality (QoS) of emergency bearing in this establishment emergency bearing request message, the PDN that sends from UE connects the PDN address assignment parameter that discharges the UE that parses the request message, urgent call indication (Emergency indicator), protocol configuration option information (PCO), MME Context identifier (MME Context ID).

Wherein, PCO can be used for being used for to the PDN network requests Application Function (AF) address of emergence call service.This AF address can be used for after the emergency bearing foundation, and UE, is known the IP address of EC in the PDN network from this AF, thereby communicated with EC by utilizing existing IP-based data transmission technology based on this AF address of knowing.

Step 303, the Serving GW LBI relevant entry that deletion is connected with the PDN of request release in the EPS carrying tabulation of being preserved, and create the emergency bearing clauses and subclauses of an emergence call service, if the PDN GW in PDN connections of request deletion is different with PDN GW on the emergency bearing of asking foundation, remember that then the PDN GW in the PDN connection to be deleted is PDN GW1, remembers that the PDNGW on the emergency bearing to be created is PDN GW2.Serving GW sends deleting bearing request (Delete BearerRequest) message to PDN GW1, sends to PDN GW2 and creates emergency bearing request (Create Emergency BearerRequest) message.

Create can comprise in the emergency bearing request message Serving GW on UE sign, Emergency Bearer ID, EmergencyAPN, the emergency bearing to be set up be used for the Serving GW user face address of the business datum of the emergence call service of the mutual UE of PDN GW2 and Tunnel Identifier, emergency bearing to be set up on Serving GW be used for the relevant Tunnel Identifier of controlling the ServingGW control plane address of signaling of emergence call service with the mutual UE of PDN GW2.QoS, protocol configuration option information, the urgent call that can further comprise emergency bearing in the establishment emergency bearing request message indicated, the PDN address assignment parameter of UE.

Step 304, PDN GW1 and PDN GW2 obtain relevant PCC rule alternately with the set PCRF of network side respectively, wherein, PDN GW1 obtains the PCC rule that connects about PDN to be deleted from PCRF, PDN GW2 obtains the PCC rule of emergency bearing to be created from PCRF, to be used for the follow-up strategy and the control of chargeing being carried out in the urgent call that the user was initiated.

Usually, emergence call service is free service.In the practical application, if network side is not provided with the PCRF entity, then can be by PDN GW2 static configuration relevant information, as charging policy etc.

Step 305, PDN GW1 and PDN GW2 return corresponding response message to Serving GW respectively, wherein, PDN GW1 returns deleting bearing response (Delete Bearer Response) message to Serving GW, after PDN GW2 receives and creates bearing request message, the information that storing and resolving goes out is returned establishment emergency bearing response (Create Emergency Bearer Response) message to Serving GW.

Can comprise UE identifies, PDN to be deleted connects bearing identification and deletion result in the deleting bearing response message.Wherein, the deletion result can be that the PDN connection is deleted successfully, or PDN connection deletion failure, if failure is deleted in the PDN connection, then carries out subsequent treatment by MME, and the application is not further elaborated.

Create that can to comprise PDN GW2 chain of command Tunnel Identifier, the PDN GW2 that PDN GW2 is used for being used for the relevant control of the emergence call service signaling of the mutual UE of Serving GW with the PDN GW2 user face address of the emergence call service data of the mutual UE of Serving GW and Tunnel Identifier, PDN GW2 in the emergency bearing response message be PDN address information, the Emergency Bearer ID of UE distribution according to the PDN address assignment parameter of the UE that parses.

Wherein, the PDN address information can be IPv4 address or IPv6 address prefix or IPv6 interface identifier.In addition, in the practical application, if do not carry PDN address assignment parameter in the emergency call request message, then not carrying PDN GW2 in the establishment emergency bearing response message that PDN GW2 returns is the PDN address that UE distributes, follow-up, UE can utilize emergency bearing and the PDN network interaction that builds up, and obtains the PDN address.

Create in the emergency bearing response message and can comprise further that also PDM GW2 is AF address, the upstream data service data flow template (UL TFT) that finds based on PCO.UL TFT is used to indicate UE that upstream data is mapped to the indicated emergency bearing of emergency bearing sign.

The establishment emergency bearing response message that deleting bearing response message that step 306, Serving GW reception PDN GW1 return and PDNGW2 return returns establishment emergency bearing response message and deleting bearing response message to MME.

PDN address, the Serving GW that Serving GW can comprise UE sign in the establishment emergency bearing response message that MME returns, distribute to UE be used for and eNB between the Serving GW user face address of transmission emergence call service data and Tunnel Identifier, Serving GW Context identifier, emergency bearing sign, also can comprise information such as PCO, UL TFT.

Serving GW can comprise information such as bearing identification that the PDN of UE sign, deletion connects and deletion result in the deleting bearing response message that MME returns.

Step 307, MME send carrying to eNB and set up request (Bearer Setup Request) message, and this carrying is set up the urgent call that comprises the MME structure in the request message and accepted message (Emergency CallPDN Accept) and session management configuration information.

In this step 307, carrying set up that LBI, emergency bearing sign, emergency bearing QoS, Serving GW that the PDN that also can comprise UE sign, needs deletion in the request message connects are used for and eNB between transmit the Serving GW user face address of emergence call service data and Tunnel Identifier or the like.Urgent call accepts can comprise in the message PDN address, emergency bearing sign, protocol configuration option.Comprise UE sign, emergency bearing sign in the session management configuration information, also can further comprise emergency bearing QoS, UL TFT or the like.

After step 308, eNB receive that request message is set up in carrying that MME returns, preservation parse to Serving GW user face address and Tunnel Identifier, the relevant resource of LBI that the PDN that discharging needs deletion connects sends RRC to UE and connects reprovision (RRC Connection Reconfiguration) message.

In this step 308, RRC connects in the reconfiguration message can comprise the LBI that deleted PDN connects, and informs promptly that also session management configuration information and urgent call as resource informations such as time slot, code channel, transparent transmission that UE is used for wireless connections accept message.

Step 309, UE carry out radio configuration after receiving that RRC connects reallocation message, send RRC connection reprovision to eNB and finish (RRC Connection Reconfiguration Complete) message.

Parse after urgent call accepts message and session management configuration information at UE, UE carries out the protocol layer configuration according to the session management configuration information, as upstream data being mapped on the emergency bearing of bearing identification correspondence, be used for resource information of wireless connections or the like, UE can be by the carrying of building of top institute to providing emergency services PDN network to send up emergency call service data.

Step 310, eNB send carrying to MME and set up response (Bearer Setup Response) message after receiving that RRC that UE returns connects reprovision and finishes message.

In this step 310, carrying set up can include in the response message that eNB is used for and Serving GW between the eNB user's face address and the Tunnel Identifier of emergence call service data of transmission UE, be used for ServingGW and send downlink data to eNodeB.

After step 311, MME receive that response message is set up in carrying that eNB returns, send to Serving GW and to upgrade bearing request message (Update Bearer Response).

Upgrade comprise the emergency bearing sign in the bearing request message, eNB is used for and Serving GW between the eNB user's face address and the Tunnel Identifier of emergence call service data of transmission UE.

After step 312, Serving GW receive the renewal bearing request message that MME sends, preserve the eNB user's face address and the Tunnel Identifier that parse, return to MME and upgrade bearing response message (UpdateBearer Response).

So far, being used for emergency bearing that UE carries out urgent call sets up and to finish, comprise: eNB carries out emergence call service with the allocation of radio resources that discharges to UE, between eNB and the Serving GW, between the PDN GW of Serving GW and responsible processing emergence call service, based on the other side's who is stored user's face address and Tunnel Identifier, the emergence call service data of transmission UE.

In addition, cause is connected deleted with the PDN that PDN GW1 is built, be activated and be connected with PDN that PDN GW2 is built, follow-up, MME can send to the HSS of core-network side and upgrade location request message (Update Location Request), purpose is to upgrade the PDN that HSS preserved to connect contextual information, to share with this information and as cdma2000.Reply to MME behind HSS storage PDN GW2 address and the APN that is associated and upgrade position response message (Update Location Ack).

Embodiment two:

In the present embodiment two, the IP-CAN network is a GPRS network, and mobile management nodes is SGSN, and wireless access control equipment is RAN, and referring to Fig. 4, Fig. 4 is a flow chart of realizing user's emergence call service in the present embodiment two in the PS territory, and this flow process can may further comprise the steps:

Step 401, UE send PDN by RAN to SGSN and connect the release request message, be deexcitation packet data protocol context request (Deactivate PDP Context Request) message, carry emergency call request message in this deexcitation PDP Context request message, promptly activate the request message of urgent PDP Context.

Also can comprise UE sign in the deexcitation PDP Context request message, deexcitation PDP Context identifies (Linked NSAPI), also can further comprise deexcitation interacting message sign (TI), deexcitation reason etc., the deexcitation reason can be indicated and is used to set up emergency bearing, thinks that the foundation of emergency bearing distributes higher processing priority.

Activate and comprise UE sign, emergency telephone number, urgent PDPContext sign, emergency bearing APN in the urgent PDP context request message, also can further comprise deletion indication (Teardown Ind), activate interacting message sign TI, pdp address allocation of parameters, emergency bearing QoS, request distributes the PCO of AF address.

In the present embodiment two, establishing needs PDN of deletion to connect, and is not only to discharge a part resource in the PDN connection.IP address and APN group for UE, the corresponding main PDPContext (Primary PDP Context) of possibility and a plurality of auxilliary PDP Context (Secondary PDP Context), if activate and carry the deletion indication in the urgent PDP context request message, then expression needs deletion and all PDP Context that deexcitation PDP Context sign is associated, and comprises a main PDP Context and a plurality of auxilliary PDP Context.

Step 402, SGSN receive and resolve deexcitation PDP Context request message and activate the request message of urgent PDPContext, identify according to deexcitation PDP Context, discharge the relevant clauses and subclauses of this PDP Context, set up the relevant urgent PDP Context clauses and subclauses of urgent PDP Context sign.SGSN selects a PDN GW address that the path is nearest according to the emergency bearing APN that parses, and sends deletion PDPcontext request message and creates PDP Context request message to Serving GW.

If do not carry urgent APN in the request message of the urgent PDP Context of activation, then SGSN can select a urgent APN according to emergency telephone number, finds out corresponding PDN GW address again.

SGSN comprises in the deletion PDP Context request message that Serving GW sends: the deleting bearing sign that the Serving GW that UE sign, SGSN are mapped to according to deexcitation PDP Context sign can discern.SGSN comprises emergency bearing sign, emergency bearing APN, SGSN control plane address and Tunnel Identifier, SGSN user's face address and the Tunnel Identifier that Serving GW that UE sign, emergency telephone number, SGSN be mapped to according to urgent PDP Context sign can discern in the establishment PDP Context request message that Serving GW sends, also can further comprise emergency bearing QoS, pdp address allocation of parameters, protocol configuration option PCO, radio access technology types (RAT Type) or the like information.

The PDN GW of step 403, processing deexcitation and activation is same PDN GW, after then ServingGW receives deletion PDP Context request message and creates PDP Context request message, send deleting bearing request message (Delete Bearer Request) and create emergency bearing request message (Create Emergency Bearer Request) to PDNGW.

Wherein, carry UE sign, deleting bearing sign (EPS Bearer ID), deletion indication (Teardown Ind) in the deleting bearing request message; Create in the emergency bearing request message and carry UE sign, emergency telephone number, emergency bearing sign, emergency bearing APN, Serving GW user face address and Tunnel Identifier, Serving control plane address and Tunnel Identifier, also can further comprise emergency bearing QoS, RAT Type, PDN address allocation information, PCO or the like information.

After step 404, PDN GW receive the message that Serving GW sends, discharge deleting bearing and identify pairing bearer context information, PDN GW obtains the PCC rule of emergency bearing to be set up from PCRF, downlink service data flow template (DL TFT) is set, the PDN address of distributing carrying QoS resource and UE is returned the deleting bearing response message and is created the emergency bearing response message to Serving GW.

Wherein, comprise UE sign and Tunnel Identifier (this sign will be changed to 0) in the deleting bearing response message

Create in the emergency bearing response message and comprise: also can further comprise in UE sign, emergency bearing sign, PDN GW user face address and Tunnel Identifier, PDN GW control plane address and Tunnel Identifier, this establishments emergency bearing response message PDN GW be the PDN address distributed of UE or claim pdp address, based on the AF address of PCO distribution, upstream data service data flow template or the like information.UL TFT is used to indicate UE that upstream data is mapped to corresponding carrying, and promptly emergency bearing identifies in the indicated carrying.

Step 405, Serving GW return the deleting bearing response message to SGSN after receiving the response message that PDN GW returns, and promptly delete PDP Context response message and create the emergency bearing response message, promptly create urgent PDP Context response message.

Wherein, the Tunnel Identifier that comprises UE sign and deletion PDP context correspondence in the deletion PDP context response message.Create and comprise UE sign, Serving GW user face address and Tunnel Identifier in the urgent PDP Context response message, also can further comprise pdp address, the information such as PCO, UL TFT of distributing to UE.

After step 406, SGSN receive the deletion PDP Context response message that Serving GW returns and create urgent PDP Context response message, send carrying to RAN and set up request message, be RAB assignment request (RAB Assignment Request) message, comprise in this RAB assignment request message urgent PDP Context correspondence the RAB bearing identification, set up the needed qos parameter of RAB, SGSN user's face address and Tunnel Identifier, d/d RAB identification list.

After step 407, RAN receive the RAB assignment request message, according to emergency bearing QoS Resources allocation, and send and to require UE to reshuffle the reallocation message of wireless connections, promptly radio bearer is set up message and is given UE.

The radio bearer that RAN sends to UE is set up and is comprised temporary mark such as the Radio Network Temporary Identifier (C-RNTI, Cell Radio Network Temporary Identifier) that UE is used for connecting system in the message, the Signaling Radio Bearer tabulation (SRB List) that remains to be set up, emergency bearing to be set up is the RAB information list, reprovision radio bearer information tabulation (RB information List), the resource information that is used for wireless connections is as increasing or reprovision uplink transport channel information list, increase or reprovision descending transmission channel information list, the security information parameter of UE, the core network domain indication parameter of indication packet domain or the like information.

Step 408, UE receive after radio bearer sets up message, carry out corresponding radio configuration, send radio bearer foundation to RAN and finish message (Radio Bearer Setup Complete), comprise configuration result, as the encryption parameter activationary time of the radio bearer correspondence set up with start tabulation (START List).

Step 409, RAN receive radio bearer that UE returns set up finish message after, the link circuit resource of eating dishes without rice or wine is finished in configuration, sends RAB to SGSN and assigns response (RAB Assignment Response) message.The bearing identification (RAB ID) that comprises the RAB that is established in this message, RNC user's face address and Tunnel Identifier, the RAB that has discharged tabulation.

After step 410, RAB carrying were set up successfully, SGSN was encapsulated in deexcitation PDP Context Accept message and the urgent PDP Context acceptance of activation (Activate Emergency PDP Context Accept) message in the direct-sending message (Direct Transfer) and sends to RAN.

Comprise UE sign, deleted bearing identification and deexcitation interacting message sign in the deexcitation PDP context Accept message.Activating urgent PDP Context accepts to comprise in the message UE sign, emergency bearing sign, activates interacting message sign, emergency bearing QoS, also can comprise Radio priority level parameter, protocol configuration option, pdp address or the like information.

Step 411, RAN are with deexcitation PDP Context Accept message and Activate EmergencyPDP Context Accept forwards and be encapsulated in the descending direct-sending message (Downlink Direct Transfer) and send to UE.

So far, UE sets up to the emergency bearing between the PDN GW and finishes.Follow-up, between UE and the PDN network, can be based on the emergency bearing that is established, the business datum of mutual emergence call service.

More than two embodiment enumerated by set up the emergency bearing between UE and the PDN GW as IP-CAN such as EPS, GPRS, be used to carry the specific embodiments of emergence call service, from above-mentioned two technical schemes that embodiment embodied, can know by inference in the cdma2000, under the resource-constrained situation that the user can take, how to realize all processes of user's emergence call service, be that with the difference of above-mentioned two embodiment message name related when setting up emergency bearing in the cdma2000 is different.

In sum, in the technical scheme provided by the present invention, user for the PS territory, for under the shared resource-constrained situation of user, realize emergence call service, by discharging the part or all of resource of CU, satisfy and set up the emergency bearing resource requirement, make the user in time carry out emergence call service, obtain timely relief, thereby retrieve its loss as far as possible.

Claims

1. an emergency bearing-establishing method that is used for emergence call service is characterized in that, comprising:

A, Internet protocol connect access network IP-CAN after receiving the emergency call request message that user equipment (UE) is initiated, and discharge the packet data network PDN that belongs to described UE and connect shared part or all of resource; Carry UE sign and emergency telephone number in the described emergency call request message;

2. method according to claim 1 is characterized in that, IP-CAN discharges described part or all of resource and comprises:

After described IP-CAN receives described emergency call request message,, select d/d resource according to service quality QoS professional in the PDN connection that belongs to described UE.

3. method according to claim 1 and 2 is characterized in that, IP-CAN receives that the emergency call request message that UE initiates comprises:

4. method according to claim 3 is characterized in that, described PDN connects and further comprises former because set up described emergency bearing that release PDN connects in the release request message.

5. method according to claim 1 and 2, release portion or whole resource comprise:

Release belongs to the part resource in the PDN connection of described UE.

6. method according to claim 1 is characterized in that, described IP-CAN sets up described bearer path and comprises:

7. method according to claim 6 is characterized in that, described mobile management nodes is that described emergence call service distributes PDN GW address to comprise:

8. method according to claim 6 is characterized in that, mutual control plane address and the Tunnel Identifier separately of described Serving GW and described PDNGW, and separately user's face address and Tunnel Identifier comprise:

9. method according to claim 8 is characterized in that, after described PDN GW received the establishment emergency bearing request message of described Serving GW transmission, this method further comprised:

10. method according to claim 6 is characterized in that, described Serving GW is by described mobile management nodes, and with mutual control plane address and the Tunnel Identifier separately of wireless access control equipment, and separately user's face address and Tunnel Identifier comprise:

11. method according to claim 6 is characterized in that, described IP-CAN comprises to described emergency bearing d/d resource allocation:

12. method according to claim 11 is characterized in that, further carries the upstream data map information that UE is used for the mapping uplink data in the described reallocation message, after described UE received described reallocation message, this method further comprised:

13. method according to claim 1 is characterized in that, after the described step B, this method further comprises:

14. a communication system is characterized in that, comprising: IP-CAN, UE and PDN network, wherein,

IP-CAN, after receiving the emergency call request message of UE initiation, the PDN that release belongs to described UE connects shared part or all of resource, set up described UE and the bearer path of the emergency bearing between the PDN network of the pairing emergence call service of described emergency telephone number is provided, and give described emergency bearing with d/d resource allocation, described emergency bearing is used to carry the business datum of described emergence call service; The PDN network utilizes the emergency bearing that is established, and transmits the business datum of emergence call service between the UE.

15. communication system according to claim 14 is characterized in that,

16. communication system according to claim 15 is characterized in that,