CN101800958A - Method and system for obtaining emergency session information - Google Patents

Abstract

The invention provides a method and a system for obtaining emergency session information, comprising the following steps that (a) after a user device UE receives an emergency indication sent by an IMS (IP Multimedia Subsystem), the user device actively sends emergency loading indication information to an EPS (Evolved Packet System) network for indicating the emergency loading indication information being emergency loading; and (b) the EPS network receives the emergency loading indication information and recognizes whether a loading used by the current session is an emergency loading or not according to the emergency loading indication information. The method and the system can ensure the continuity and the voice quality of the current session and solves the problem of failure of emergency session handover.

Description

Method and system for obtaining emergency session information

technical field

The present invention relates to the communication field, in particular to a method and a system for obtaining emergency session information when a user equipment implements an IMS emergency session service in a 3GPP (3rd Generation Partnership Project) network.

Background technique

In the evolution of existing networks, with the development of flat network architecture and the emergence of various high-speed broadband mobile access methods, the mobile communication network has proposed LTE/SAE (Long term Evolution/System Architecture Evolution, long-term evolution/system architecture evolution) )'s next-generation architecture concept, including enabling the evolved wireless communication system to provide higher transmission rates, shorter transmission delays, and lower costs, while supporting mobility between 3GPP internal access systems, and 3GPP access mobility between access systems and non-3GPP access systems, etc. LTE/SAE is further defined as EPS network (Evolved Packet System, Packet Evolution System) according to standard progress. EPS network is also used as an access method in the IMS domain, which promotes the evolution and development of the IMS architecture.

3GPP Evolved Packet system (EPS for short) consists of E-UTRAN (Evolved Universal Terrestrial Radio Access Network, Evolved Universal Terrestrial Radio Access Network), MME (Mobility Management Entity), S-GW (Service Gateway, Serving Gateway), P-GW (Packet Data Network GateWay, data network gateway), HSS (Home Subscriber Server, Home Subscriber Server), 3GPP AAA server (3GPP Authentication Authorization Accounting Server), PCRF (Policy and Charging RulesFunction, Policies and charging rule functions), and other supporting network element equipment.

E-UTRAN is the next-generation radio access network, which can provide higher uplink and downlink rates, lower transmission delay and more reliable wireless transmission. Among them, the main network entity of E-UTRAN is eNodeB.

MME is responsible for mobility management and storage of UE context (such as UE/user identity, mobility management status, user security parameters, etc.) and other control plane related work, assigns temporary identifiers to users, and is responsible when the UE is camped in the tracking area or the network Authenticate the user.

Serving GW (S-GW for short), the user plane functional entity, is the mobility anchor point between the EPS system and the traditional 3GPP system and the mobility anchor point between the E-UTRAN. The S-GW is an access gateway device connected to the E-UTRAN, forwards data between the E-UTRAN and the P-GW, and is responsible for caching the paging waiting data.

PDN GW (referred to as P-GW), the user plane functional entity, is responsible for the access of user equipment to PDN, forwarding data between EPS and PDN, and other functions. Perform routing processing on the user plane data, terminate the downlink data of the UE in the idle state, and initiate paging when the downlink data sent to the UE arrives. Manage and store UE context, such as IP bearer service parameters and network internal routing information, etc.

PDN (Packet Data Network): packet data network, which provides users with a packet-based service network. In this context, the PDN is the IMS network.

The HSS is a home subscriber server, which manages information such as user subscription data in the circuit (CS) domain, packet domain (PS) and IMS domain.

PCRF is a policy and charging rule functional entity. It interfaces with the operator's 1P service network through the Rx interface to obtain service information and is responsible for initiating IP (Internet Protocol, Internet Protocol) bearer policy decisions, such as bearer establishment and deletion, service data/ Bearer Qos (Quality of service, quality of service), etc., and perform charging control. In a traditional 3GPP network, the Policy and charging enforcement function (PCEF) exists in the P-GW, and PCRF can complete all functions including QoS-related policies and charging as long as it interfaces with the P-GW control. If PCRF is not configured, QoS-related policies and charging rules can be configured locally on PCEF.

Emergency call (Emergency Call) is a unique voice service function in the mobile communication system. Even if the mobile terminal is set to restrict outgoing calls and has not inserted a Subscriber Identity Module (SIM), as long as it is within the area covered by the mobile network, when the user dials an emergency number such as: 110, 119, 911, etc., the call will be transferred to the corresponding The emergency call center (PSAP) such as: police station, fire brigade, emergency center, etc., thus providing 24-hour emergency rescue service to the masses. The operation of the entire system is completed by the cooperation of telecommunications operators and emergency service agencies such as public security, fire protection, and hospitals.

Traditionally, emergency calls are placed in the circuit (CS) domain. With the gradual IP-based network, the PS domain also gradually supports emergency call services, and uses the IMS system to control call signaling for emergency sessions. Currently, the emergency call service provided by using the IMS domain may be referred to as IMS emergency call for short. The IMS emergency call needs to implement IP bearer in the EPS access system.

IMS emergency calls must be provided by the IMS (IP Multimedia Subsystem, IP Multimedia System) network where the UE resides. That is to say, if the UE is at home, the home IMS network will provide emergency session services. If the UE is visiting Therefore, the emergency session service is provided by the visited IMS network. As shown in Figure 1, the network side of the IMS emergency call system mainly includes: Proxy Call Session Control Function (P-CSCF for short), Serving Call Session Control Function (S-CSCF for short) ), Emergency Call Session Control Function (E-CSCF for short), and Public Safety Answering Point (PSAP for short).

Wherein, the P-CSCF is used as a proxy to forward the request and response between the UE and the S-CSCF, and is connected with the PCRF through the Rx interface. The S-CSCF is the home service entity of the UE, and is used to provide functions such as emergency registration and authority control for the UE. PSAP is an emergency call service center, which is responsible for accepting emergency calls from users.

E-CSCF is a new functional entity introduced in the IMS domain. It is located in the same network as the P-CSCF (the user's visited network when the user is roaming), and is responsible for receiving the emergency session establishment request from the P-CSCF, and Establish an emergency session connection with the emergency communication acceptance center (PSAP).

As shown in Figure 2, when the UE accesses the EPS network and dials an IMS emergency call, the specific bearer establishment and IMS call process are as follows. This process mainly describes the establishment process of the IMS emergency call when the UE does not recognize the emergency call:

Step 201: The UE initiates a normal attach request on the EPS network, carrying the identity of the UE;

Step 202: The MME in the EPS network performs authentication and security authentication on the UE, downloads user data from the HSS, obtains the IP address or APN of the P-GW used for the service, and finds the IP of the P-GW from the DHCP server according to the APN address.

Step 203: The MME initiates a default bearer establishment request to the P-GW, and the P-GW downloads the charging and QoS rules from the PCRF. If the PCRF is not configured, it adopts the locally configured rules and responds to the MME with the default bearer establishment request. The MME sends a radio bearer establishment request to the eNodeB, establishes radio bearer resources, and finally completes the establishment of a default bearer.

If the UE conducts a session of a special session service, the UE can apply to the P-GW to establish a dedicated bearer, and the P-GW can establish a dedicated bearer for the special session service for the UE, providing different QoS and charging rules.

Step 204: Before performing the IMS session service, the UE needs to discover the P-CSCF locally and register with the home IMS;

Step 205: The UE initiates an INVITE call request to the P-CSCF, and the UE needs to determine whether it is an emergency call when making a call. If it is an emergency call, the INVITE message needs to carry the emergency identifier and the location information of the UE; if it cannot be identified as an emergency call, the UE considers it a normal call and handles it according to the normal call flow.

Step 206: After receiving the INVITE call request from the UE, the P-CSCF needs to judge whether it is an emergency call request, and if it is an emergency call request, transfer it to the E-CSCF of the same network for emergency session request processing. For the case where the UE fails to identify the emergency call, the P-CSCF will notify the UE that this is an emergency call in the relevant signaling of the IMS call response, for example, by carrying the emergency identifier in the 200 OK response.

If the P-CSCF judges that it is an ordinary call request, it will process it according to the normal session flow, and send the call request to the S-CSCF of the home IMS network for subsequent session processing.

Step 207: The P-CSCF judges that it is an IMS emergency call request, and sends the INVITE call request to the E-CSCF of the same IMS network to process the request session request. The E-CSCF requests the location server to query the location information of the UE, and finds the routing address of the PSAP according to the location information of the UE.

Step 208: The E-CSCF sends the emergency call request to the emergency center PSAP, and the PSAP responds to the call, and finally establishes a VoIP emergency session between the UE and the PSAP.

When the UE initiates an unidentified IMS emergency call, the EPS network will use the default bearer or dedicated bearer to initiate a normal call. At this time, if the UE moves to a restricted area, the network cell where it is located has changed, and emergency session bearer switching is required. problem will arise.

Figure 3 shows the TAU process when the MME of the EPS network where the UE is located changes. The UIE is using the default bearer or other dedicated bearer to make an IMS emergency call that the UE does not recognize. When the UE moves to a new TA area and triggers a TAU (Tracking Area Update, area location update) request, after receiving the TAU request, the target MME needs to In step 304, apply to the old MME for the MME context used by the original bearer. The Old MME needs to confirm whether the UE has been authenticated by the target MME, and return a context response. If the target MME does not authenticate the UE, it must execute the access authentication in step 306, download user data from the HSS, and perform access authentication on the UE. At this time, if the UE has access restrictions, it will be prohibited from accessing the target MME, causing the TAU process to fail, and the ongoing emergency session of the UE may be interrupted due to the inability to switch the EPS bearer.

Figure 4 shows the handover process when the EPS network eNodeB (which is the base station system of LTE, also called E-UTRAN) where the UE is located changes. The UE is using the default bearer or other dedicated bearer to make an IMS emergency call that the UE does not recognize. When the UE moves to a new TA area, the eNodeB changes. At this time, the UE sends a wireless measurement report to the source eNodeB, and the source eNodeB uses the TA in the measurement report. The information will select a target eNodeB for bearer switching. However, if the UE moves to an area with restricted services and the source eNodeB does not know that the bearer session is an emergency session, the source eNodeB will not actively initiate a default bearer or dedicated bearer switchover to the target eNodeB, but will notify the MME to release the original default bearer. Or dedicated bearer, which will cause interruption of the emergency session.

In the scenario in Figure 4, even if the source eNodeB initiates a bearer handover request to the target eNodeB, the target eNodeB also judges whether the service of the UE is restricted in this area. If the service is restricted, it will actively reject the handover request of the default bearer or dedicated bearer, resulting Disruption of an emergency session.

Therefore, it is necessary to find a method to notify the EPS bearer network of the emergency call information during the IMS emergency session, so as to solve the problem that the emergency session bearer switch fails because the UE needs to switch to the default bearer or dedicated bearer when it moves to a restricted area .

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and system for obtaining emergency session information, so as to ensure the continuity and voice quality of the emergency session, and avoid the problem of emergency session switching failure.

In order to solve the above technical problems, the present invention provides a method for obtaining emergency session information, the method comprising:

(a) After receiving the emergency session indication issued by the IP Multimedia System IMS network, the user equipment UE actively sends emergency bearer indication information to the Evolved Packet System EPS network, which is used to indicate that the bearer used by the current session is an emergency bearer;

(b) The EPS network receives the emergency bearer indication information, and identifies that the bearer used by the current session is an emergency bearer according to the emergency bearer indication information.

Further, in step (a), the UE sends a bearer update or area location update TAU request to the EPS network according to the emergency session indication, and the request carries the emergency bearer indication information, and in step (b) The EPS network performs a bearer update or area location update process according to the request, and identifies that the bearer used by the current session is an emergency bearer during the bearer update or area location update process.

Further, the emergency bearer indication information includes emergency identification or emergency QoS parameters, and in step (b), when performing bearer update or area location update, the base station eNodeB of the EPS network maps the emergency QoS parameters to wireless emergency QoS parameters , and send a radio resource connection reconfiguration message to the UE, which carries radio emergency Qos parameters.

The method according to claim 3, characterized in that: in step (b), during the bearer update process, the emergency QoS parameters are determined by the data network gateway P-GW of the EPS network.

The method according to claim 3, characterized in that: in the step (a), the TAU request is sent to the mobility management unit MME of the EPS network; in the step (b), in the TAU process, the MME receives After receiving the TAU request, actively initiate a bearer update request, which carries emergency QoS parameters or emergency identifiers locally configured by the MME.

Further, in step (a), the TAU request is sent to the MME of the EPS network; in step (b), in the TAU process, the MME notifies the base station eNodeB that the bearer is Emergency bearer.

In order to solve the above technical problems, the present invention also provides a system for obtaining emergency session information, the system includes user equipment and EPS network, wherein,

The user equipment is configured to send emergency bearer indication information to the EPS network according to the emergency session indication sent by the IMS network, for indicating that the bearer used by the current session is an emergency bearer;

The EPS network is configured to receive emergency bearer indication information sent by the user equipment, and identify the bearer used by the current session as an emergency bearer according to the emergency bearer indication information.

Further, the emergency bearer indication information is sent to the EPS network through a bearer update or area location update request sent by the user equipment to the EPS network; the EPS network is configured to perform bearer update according to the request or zone location update process.

Further, the emergency bearer indication information includes an emergency identifier or an emergency Qos parameter, and the EPS network includes a base station eNodeB, configured to map the emergency QoS parameters to wireless emergency QoS parameters, and send a radio resource connection reconfiguration message to the UE, wherein Carrying wireless emergency Qos parameters, the UE is also used to receive the wireless resource connection reconfiguration message.

Further, the bearer update request further includes a bearer update parameter, where the bearer update parameter is used to indicate to add or modify a bearer, and the eNodeB is also used to modify the radio resource bearer as an emergency radio bearer resource or an emergency bearer according to the bearer update parameter. Establish emergency radio bearer resources.

Compared with the prior art, in the method and system of the present invention, after receiving the emergency call indication from the IMS network, the UE notifies the emergency bearer type of the EPS network through relevant procedures, so that the MME and eNodeB of the EPS network can identify that the bearer is for The emergency bearer of the IMS emergency session, so that the emergency bearer will be switched to the target network when the area location update TAU or handover is performed, which greatly guarantees the continuity of the emergency session service and the high quality and high reliability of the voice.

Description of drawings

FIG. 1 is a schematic diagram of a system architecture in which a UE accesses an EPS network to implement an IMS emergency call.

Fig. 2 is a flowchart of implementing an IMS emergency session by a UE on an EPS bearer in the prior art.

FIG. 3 is a schematic diagram of a scenario where emergency session bearer switching fails when a UE performs a TAU process in the prior art.

Fig. 4 is a schematic diagram of a scenario where emergency session bearer handover fails when a UE performs a Handover process in the prior art.

FIG. 5 is a schematic diagram of a UE actively initiating a bearer update process according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an emergency TAU process initiated by a UE actively according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a method for acquiring emergency session information in the present invention.

Detailed ways

In the 3GPP network, when the UE uses the IMS network to perform the IMS emergency session service, the UE needs to judge whether it is an emergency call, for example, it can identify by comparing the dialed emergency number with the emergency number stored in the UE. If the UE cannot recognize it, it will initiate a call establishment request according to the normal call flow. After receiving the call establishment request, the IMS network needs to determine whether it is an emergency call or a normal call. If it is an emergency call, the IMS network will continue to process the emergency call request and finally establish the UE In the IMS emergency session with the emergency center PSAP, the UE is notified in the response message that it is an emergency session.

The main idea of the method and system for obtaining emergency session information by the EPS network of the present invention is that after the UE receives the emergency session indication notified by the IMS network, the UE actively notifies the EPS network that the bearer used for the IMS emergency session is an emergency bearer to avoid When the UE is conducting an unidentified IMS emergency session, if the UE moves to a restricted area, the bearer handover of the emergency session will fail, so as to ensure the continuity and voice quality of the emergency session.

As shown in Figure 7, the method for obtaining emergency session information in the present invention includes:

(a) After receiving the emergency session indication notified by the IMS network, the user equipment UE sends emergency bearer indication information to the EPS network, which is used to indicate that the bearer used by the current session is an emergency bearer for the emergency session;

(b) The EPS network receives the emergency bearer indication information, and identifies that the bearer used by the current session is an emergency bearer according to the emergency bearer indication information.

In the present invention, after the UE receives the emergency call indication from the IMS network, it initiates a bearer update or emergency TAU process, and notifies the EPS network that the bearer is an emergency bearer, so that when the UE moves to a restricted area, it can realize emergency session switching , ensuring the continuity and voice quality of the emergency session, and avoiding the failure of emergency session switching.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

first embodiment

The first embodiment of the present invention is shown in FIG. 5 . The main idea is that after receiving a message from the IMS network notifying that this is an IMS emergency session, the UE actively applies to the P-GW for a bearer update, carrying emergency QoS parameters and an emergency identifier. The MME and/or the eNodeB identify the emergency bearer according to the emergency QoS rule or the emergency identifier. Proceed as follows:

Figure 5 describes the flow of UE actively initiating a bearer update to the EPS network after receiving the emergency call indication from the service notification. As shown in Figure 5, the bearer update process includes the following steps:

Step 501: After receiving the emergency session ID of the service notification, the UE actively initiates a bearer resource update request to the MME, carrying the ID of the UE, the current bearer ID (LBI, Linked Bearer D), and the emergency session ID used to indicate that the current bearer is an emergency bearer type. Identification, E-QoS (emergency QoS) parameters to be modified and bearer update parameters, where the bearer update parameters are used to indicate the addition or modification of bearers;

Step 502: The MM initiates a bearer resource update request to the S-GW, carrying UE ID, current bearer indication, emergency ID, E-QoS (emergency QoS) parameters and bearer update parameters; LBI is used to indicate the modified bearer link.

Step 503: The S-GW initiates a bearer resource update request to the P-GW, carrying the UE ID, current bearer indication, emergency ID, E-QoS (emergency QoS) parameters and bearer update parameters; LBI is used to indicate the modified bearer link .

Step 504: The P-GW interacts with the PCRF to apply for a suitable PCC rule for the currently modified bearer or the added new emergency bearer, carrying the emergency identifier.

The PCRF sends the emergency charging and QoS rules to the P-GW according to the emergency identifier. If PCRF is not configured, P-GW sets emergency charging and QoS rules according to local configuration.

Bearer update parameters indicate that different processing methods are used when modifying or adding bearers, which are introduced respectively as follows:

The process of bearer modification is the process A shown in Figure 5:

Step 505a: The P-GW accepts the bearer modification request, and the P-GW modifies the bearer to an emergency bearer whose QoS is emergency QoS.

The P-GW initiates a bearer update request to the S-GW, carrying the current bearer indication LBI, emergency identifier, emergency QoS parameters, etc., and the LBI is used to indicate the modified bearer link;

Step 506a: The S-GW initiates a bearer update request to the MME, carrying the current bearer indicator LBI, emergency identifier, emergency QoS parameters, etc., and the LBI is used to indicate the modified bearer link; the MME judges that the bearer is an emergency bearer according to the emergency identifier or emergency QoS parameters .

Step 507a: The MME initiates a bearer modification request to the eNodeB, carrying the current bearer indication LBI, emergency identifier, emergency QoS parameters, etc., and notifies the eNodeB to modify radio bearer resources. The eNodeB judges that the bearer is an emergency bearer according to the emergency identifier or the emergency QoS parameter.

Step 508a: The eNodeB maps the emergency QoS parameters to radio emergency QoS parameters, then sends a radio resource connection reconfiguration message to the UE, brings the radio emergency Qos parameters to the UE, and modifies the radio resource bearer as an emergency radio bearer resource.

Step 509a: After the modification of the radio bearer is completed, the eNodeB responds to the MME that the modification of the bearer is completed.

Step 510a: After receiving the bearer modification response from the eNodeb, the MME sends a bearer update response to the S-GW, notifying that the bearer update has been completed;

Step 511a: The S-GW sends a bearer update response to the P-GW, notifying that the bearer update has been completed;

The flow of emergency bearer establishment is shown in Figure 5. Flow B:

Step 505b: The P-GW accepts the bearer update request, and according to the instruction of adding a bearer, the P-GW creates an emergency bearer whose QoS is emergency QoS for the emergency session.

The P-GW initiates a dedicated emergency bearer establishment request to the S-GW, carrying the UE identity, current bearer identity LBI, emergency identity, emergency QoS parameters, etc.;

Step 506b: The S-GW initiates a dedicated emergency bearer establishment request to the MME, carrying UE identity, emergency bearer indication LBI, emergency identity, emergency QoS parameters, etc.; It is determined that the established bearer is an emergency bearer.

Step 507b: The MME initiates a bearer establishment request to the eNodeB, carrying the EPS bearer identifier, emergency identifier, emergency QoS parameters, etc., and notifies the eNodeB to establish radio bearer resources for the emergency bearer. The eNodeB judges that the bearer is an emergency bearer according to the emergency identifier or the emergency QoS parameter.

Step 508b: The eNodeB maps the emergency QoS parameters to radio emergency QoS parameters, and then sends a radio resource connection reconfiguration message to the UE, bringing the radio emergency Qos parameters to the UE, and establishing emergency radio bearer resources for the emergency bearer.

Step 509b: After the radio bearer is established, the eNodeB returns a bearer establishment response to the MME, notifying the MME that the radio bearer has been established.

Step 510b: After receiving the bearer setup response from the eNodeB, the MME sends an emergency bearer creation response message to the S-GW, notifying that the emergency bearer has been created;

Step 511b: S-GW sends an emergency bearer response message to P-GW, notifying that the emergency bearer has been created;

Step 512: Optionally, if the PCRF has been configured, the P-GW returns to the PCRF a confirmation message that the emergency bearer has been modified or added.

In order to realize the method in the first embodiment above, the present invention also provides a system for the EPS network to acquire emergency session information, the system includes user equipment and the EPS network, wherein,

The user equipment UE is configured to send a bearer update request to the EPS network according to the emergency session indication sent by the IMS network, where the emergency bearer indication information is carried to indicate that the bearer used by the current session is an emergency bearer;

The emergency session indication is sent to the user equipment when the IMS network judges that the session to be established is an emergency session;

The emergency bearer indication information may include an emergency identifier and an emergency Qos parameter, and the emergency identifier is used to indicate that the current bearer is an emergency bearer type.

In addition to the emergency bearer indication information, the bearer update request also carries UE ID, current bearer ID LBI, and bearer update parameters, where the bearer update parameters are used to indicate adding or modifying bearers.

The EPS network is configured to receive a bearer update request sent by the user equipment, execute a bearer update process, and identify the bearer used by the session as an emergency bearer according to the emergency bearer indication information.

The EPS network includes S-GW, P-GW, MME and eNodeB, which is used to identify the current session bearer as an emergency bearer according to the emergency bearer indication information;

The eNodeB is also used to map the emergency QoS parameters to wireless emergency QoS parameters, and send a radio resource connection reconfiguration message to the UE, which carries the wireless emergency Qos parameters, and is also used to modify the wireless resource bearer as an emergency radio bearer resource according to the bearer update parameters, Or establish emergency radio bearer resources for emergency bearers.

The UE is further configured to receive the wireless resource connection reconfiguration message.

second embodiment

The second embodiment of the present invention is shown in FIG. 6. The main idea is that after receiving a message from the IMS network notifying that this is an IMS emergency session, the UE actively initiates a TAU process to the MME, carrying the emergency identifier and the current bearer identifier. The MME identifies the emergency bearer according to the emergency identifier, and then the MME can initiate an emergency bearer update process, and the eNodeB identifies the emergency bearer according to the emergency identifier or the emergency QoS parameters. Optionally, the MME may not initiate an emergency bearer update, but directly notify the eNodeB through S1 signaling, carrying the emergency identifier, and the eNodeB identifies the emergency bearer according to the emergency identifier.

Figure 6 describes the flow of the UE actively initiating an emergency TAU to the EPS network after receiving the emergency call indication from the IMS service notification. As shown in Figure 6, the emergency TAU process includes the following steps:

Step 601: After receiving the emergency session identifier of the service notification, the UE triggers the initiation condition of the emergency TAU;

Step 602: The UE actively initiates a TAU request to the MME through the eNodeB, carrying the UE's identity, EPS Bearer Id, and an emergency identity used to indicate that the current bearer is an emergency bearer type. The MME judges that the bearer used for the current session is an emergency bearer according to the emergency identifier;

Optional process 1:

Step 603: After receiving the emergency TAU request, the MME actively initiates an emergency bearer update request to the S-GW, carrying the UE's identity, current bearer indication, emergency identity, and E-QoS (emergency QoS) parameters configured by the MME;

Step 604: S-GW initiates an emergency bearer update request to P-GW, carrying UE identity, current bearer indication, emergency identity, E-QoS (emergency QoS) parameters, etc.;

Step 605: The P-GW interacts with the PCRF to apply for a suitable PCC rule for the modification of the current bearer, carrying an emergency flag. The PCRF delivers the local emergency charging and QoS rules to the P-GW according to the emergency identifier. If PCRF is not configured, P-GW sets emergency charging and QoS rules according to local configuration.

Step 606: Step 606 is consistent with the process of A in FIG. 5 . The P-GW notifies the MME and the eNodeB to update the emergency bearer, carrying the emergency QoS parameters and the emergency identifier, and the eNodeB can judge that the updated bearer is an emergency bearer according to the emergency identifier or the emergency QoS parameter;

Optional process 2:

Step 607: If the above steps 603 to 606 are not performed, the MME can send an S1 signaling notification message to the eNodeB through the S1 signaling interface, carrying the EPS Bear ID bearer indication and emergency identifier, and the eNodeB can judge that the bearer is emergency based on the emergency identifier bearer, and reply an S1 signaling response message to the MME;

Step 608: The MME responds to the UE with a TAU acceptance response message, and sends the TA list to the UE, and the emergency TAU process is completed.

In order to realize the method in the second embodiment above, the present invention also provides a system for an EPS network to obtain emergency session information, the system includes a user equipment, an IMS network, and an EPS network, wherein,

The IMS network is used to establish a session, and if it is an emergency session, it is also used to send an emergency session indication to the user equipment;

The user equipment UE is configured to receive the emergency session indication sent by the IMS network, and is also configured to send an area location update (TAU) request to the EPS network according to the emergency session indication, which carries emergency bearer indication information and is used to indicate the current The bearer used by the session is an emergency type bearer;

The emergency bearer indication information may include a combination of an emergency identifier and an emergency Qos parameter, where the emergency identifier is used to indicate that the current bearer is an emergency bearer type.

Besides the emergency bearer indication information, the TAU request also carries parameters such as UE identifier and current bearer identifier LBI.

The EPS network is configured to receive the TAU request sent by the user equipment, execute the TAU process, and identify the bearer used by the session as an emergency bearer according to the emergency bearer indication information.

The EPS network includes S-GW, P-GW, MME and eNodeB, which is used to identify the current session bearer as an emergency bearer according to the emergency bearer indication information;

The eNodeB is also used to map the emergency QoS parameters to wireless emergency QoS parameters, and send a radio resource connection reconfiguration message to the UE, which carries the wireless emergency Qos parameters, and is also used to modify the radio resource bearer as an emergency radio bearer resource according to the bearer update parameters.

If the EPS network transmits messages through the S1 signaling interface when performing the TAU process, the EPS network includes MME and eNodeB, and the MME is also used to receive the TAU request sent by the user equipment, and identify the bearer used for the current session according to the emergency bearer indication information It is an emergency bearer, and is also used to send an S1 signaling notification message to the eNodeB through the S1 signaling interface, which carries the current bearer identifier and the emergency identifier.

The eNodeB is further configured to receive the S1 signaling notification message sent by the MME, and identify the current bearer as an emergency bearer according to the emergency identifier.

The UE is further configured to receive the wireless resource connection reconfiguration message.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

In the method and system of the present invention, after receiving the emergency call indication from the IMS network, the UE notifies the emergency bearer type of the EPS network through related procedures, so that the MME and eNodeB of the EPS network can identify that the bearer is an emergency bearer for an IMS emergency session, In this way, when TAU or handover is performed, the emergency bearer will be switched to the target network, which greatly guarantees the continuity of the emergency session service and the high quality and high reliability of the voice.

Claims (10)

1. A method for obtaining emergency session information, characterized in that the method comprises: (a) After receiving the emergency session indication issued by the IP Multimedia System IMS network, the user equipment UE actively sends emergency bearer indication information to the Evolved Packet System EPS network, which is used to indicate that the bearer used by the current session is an emergency bearer; (b) The EPS network receives the emergency bearer indication information, and identifies that the bearer used by the current session is an emergency bearer according to the emergency bearer indication information. 2. The method according to claim 1, wherein in step (a), the UE sends a Bearer Update or Area Location Update (TAU) request to the EPS network according to the emergency session indication, and the request carries The emergency bearer indication information, in step (b), the EPS network performs a bearer update or area location update process according to the request, and identifies that the bearer used by the current session is an emergency bearer during the bearer update or area location update process . 3. The method according to claim 1 or 2, wherein the emergency bearer indication information includes an emergency identifier or an emergency Qos parameter, and in step (b), when performing bearer update or area location update, the EPS network The base station eNodeB on the road maps the emergency QoS parameters to wireless emergency QoS parameters, and sends a radio resource connection reconfiguration message to the UE, which carries the wireless emergency QoS parameters. 4. The method according to claim 3, characterized in that: in step (b), during the bearer update process, the emergency QoS parameters are determined by the data network gateway P-GW of the EPS network. 5. The method according to claim 3, characterized in that: in the step (a), the TAU request is sent to the mobility management unit MME of the EPS network; in the step (b), in the TAU process, After receiving the TAU request, the MME actively initiates a bearer update request, which carries emergency QoS parameters or emergency identifiers configured locally by the MME. 6. The method according to claim 3, characterized in that: in step (a), the TAU request is sent to the MME of the EPS network; in step (b), in the TAU process, the MME The S1 signaling message is used to notify the base station eNodeB that the bearer is an emergency bearer. 7. A system for obtaining emergency session information, characterized in that: the system includes user equipment and an EPS network, wherein, The user equipment is configured to send emergency bearer indication information to the EPS network according to the emergency session indication sent by the IMS network, for indicating that the bearer used by the current session is an emergency bearer; The EPS network is configured to receive emergency bearer indication information sent by the user equipment, and identify the bearer used by the current session as an emergency bearer according to the emergency bearer indication information. 8. The system according to claim 7, wherein the emergency bearer indication information is sent to the EPS network through a bearer update or area location update request sent by the user equipment to the EPS network; The EPS network is configured to perform a bearer update or area location update process according to the request. 9. The system according to claim 7 or 8, wherein the emergency bearer indication information includes an emergency identifier or an emergency QoS parameter, and the EPS network includes a base station eNodeB for mapping the emergency QoS parameter into a wireless emergency QoS parameter, and send a wireless resource connection reconfiguration message to the UE, which carries the wireless emergency Qos parameter, and the UE is also used to receive the wireless resource connection reconfiguration message. 10. The system according to claim 9, wherein the bearer update request further includes a bearer update parameter, wherein the bearer update parameter is used to indicate to add or modify a bearer, and the eNodeB is also used to modify the radio station according to the bearer update parameter. The resource bearer is an emergency radio bearer resource, or the emergency radio bearer resource is established for the emergency bearer.

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