WO2010127530A1 - 一种ip多媒体子系统业务的建立方法及系统 - Google Patents

一种ip多媒体子系统业务的建立方法及系统 Download PDF

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Publication number
WO2010127530A1
WO2010127530A1 PCT/CN2009/074041 CN2009074041W WO2010127530A1 WO 2010127530 A1 WO2010127530 A1 WO 2010127530A1 CN 2009074041 W CN2009074041 W CN 2009074041W WO 2010127530 A1 WO2010127530 A1 WO 2010127530A1
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WIPO (PCT)
Prior art keywords
emergency
cscf
ims
service
address
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PCT/CN2009/074041
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English (en)
French (fr)
Inventor
朱春晖
宗在峰
李志军
Original Assignee
中兴通讯股份有限公司
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Publication of WO2010127530A1 publication Critical patent/WO2010127530A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/436Arrangements for screening incoming calls, i.e. evaluating the characteristics of a call before deciding whether to answer it
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1069Session establishment or de-establishment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/12Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2242/00Special services or facilities
    • H04M2242/04Special services or facilities for emergency applications

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for establishing a multimedia protocol service of an Internet Protocol (IP).
  • IP Internet Protocol
  • the IP Multimedia Core Subsystem is the core of the new generation of communication networks. It uses the Session Initiation Protocol (SIP) system. SIP has nothing to do with access, and has the ability to separate media service control functions from bearer separation, call and session separation, application and service separation, service and network separation, and mobile network and Internet service convergence.
  • SIP Session Initiation Protocol
  • IMS Since IMS is independent of access, emergency services (EMC, Emergency Call) under IMS can be built on the General Packet Radio Service (GPRS) network and System Architecture Evolution (SAE) network to provide uniformity. Emergency call control.
  • GPRS General Packet Radio Service
  • SAE System Architecture Evolution
  • Figure 1 shows the main network elements involved in the emergency call of the user equipment (UE, User Equipment) accessing the IMS through the SAE; wherein the solid line indicates signaling and the dotted line indicates the user's IP channel.
  • UE User Equipment
  • the main network elements involved in the emergency call of the UE to access the IMS through the SAE include: the network element of the SAE network part, the network element of the location service (LCS) part, and the network element of the IMS emergency service part. .
  • the network element of the SAE network part is configured to provide the underlying bearer management and mobility management.
  • the network elements of the SAE network part include: an enhanced radio base station (eNodeB), a mobility management entity (MME, Mobility Management Entity), and a user plane data processing processing network element (SAE GW); the SAE GW includes a packet data network gateway (P -GW, Packet Data Network Gateway) and Service Gateway (S-GW, Serving GW).
  • eNodeB enhanced radio base station
  • MME mobility management entity
  • SAE GW user plane data processing processing network element
  • P -GW Packet Data Network Gateway
  • S-GW Service Gateway
  • the MME is responsible for managing and storing the context of the UE (eg, UE identity/user identity, mobility management state, user security parameters, etc.), assigning a temporary identity to the user, when the UE is camped in the tracking area
  • the domain or network it is responsible for authenticating the UE.
  • the P-GW is a mobility anchor point in the SAE system. It is a border gateway between the SAE and the Packet Data Network (PDN). It is responsible for PDN access and forwarding data between the SAE and the PDN.
  • PDN Packet Data Network
  • the Policy and Charging Control (PCC) network element is set to establish effective policy and charging control at the underlying carrier layer and the upper layer.
  • the PCC network element includes: a Policy and Charging Rules Function (PCRF), and a Policy and Charging Enforcement Function (PCEF).
  • PCRF Policy and Charging Rules Function
  • PCEF Policy and Charging Enforcement Function
  • PCRF is an important functional entity of the PCC architecture, and is set to acquire, assemble, and deliver control policies and charging rules.
  • PCEF is the implementation point of specific policy and charging, usually located in the gateway (GW) function; in the SAE network, the PCEF function is located in the P-GW.
  • GW gateway
  • the network element of the LCS part is set to the address of the emergency call providing location service and Public Safety Answering Point (PSAP).
  • the network elements in the LCS part include: Location Require Function (LRF), which is a logical functional entity defined in the emergency call architecture to provide users with emergency call session control functions (E-CSCF, Emergency-CSCF). Location, and find the appropriate PSAP based on the location.
  • LRF Location Require Function
  • E-CSCF emergency call session control functions
  • E-CSCF Emergency-CSCF
  • GMLC Gateway Mobile Location Center
  • GMLC Gateway Mobile Location Center
  • the network element of the IMS emergency service part is set to control and process the session of the emergency call.
  • the network elements of the IMS emergency service part include:
  • HSS Home Subscriber Server
  • CSCF Call Session Control Function
  • P-CSCF proxy call session control function
  • I-CSCF query call session control function
  • S-CSCF Serving Call Session Control Function
  • E-CSCF E-CSCF.
  • the E-CSCF is the session control center of the emergency call, which determines which PSAP the emergency call should be routed to.
  • Step 1 Establish an emergency default bearer
  • the UE initiates an emergency attach, that is, when the UE initiates the normal attach, it carries the emergency identifier to inform the bearer network that the current attachment is for the emergency call; after the bearer network receives the emergency attach request of the UE, the emergency access point name (E- APN, Emergency Access Point Name) to establish a default bearer (also called default bearer, which can be called emergency default bearer) dedicated to emergency calls.
  • This default bearer is mainly used for signaling control.
  • Step 2 initiate an emergency call, and establish an emergency bearer ( dedicated bearer);
  • the UE initiates an emergency call, that is, by carrying an emergency identifier in a normal INVITE message, indicating that the call request is an emergency call; the UE fills in the emergency number in the called number, and if the UE is in the visited place, the emergency number It is the emergency number of the visited place; the emergency call is routed to the E-CSCF, and the E-CSCF queries the address of the PSAP through the LRF; the LRF determines which PSAP is served for the UE by querying the location information of the UE; the E-CSCF obtains the PSAP After the address, the call is routed to the PSAP.
  • An emergency dedicated bearer will be established on the emergency PDN connection (also known as the emergency connection) for emergency voice services.
  • the emergency bearer of the emergency PDN connection (also called the emergency connection) includes: an emergency default bearer and an emergency dedicated bearer, the former is used for carrying signaling, and the latter is used for carrying media (such as voice data), and the UE is The same IP address is used in the above emergency bearer.
  • the UE and the network can distinguish between an emergency default bearer and an emergency proprietary bearer by:
  • the QoS (Quality of Service) information that is, the emergency default bearer is a non-guaranteed bitrate resource (Non-GBR, Non Guaranteed Bitrate Resources) bearer, and the emergency dedicated bearer is a GBR bearer.
  • the emergency default bearer is a non-guaranteed bitrate resource (Non-GBR, Non Guaranteed Bitrate Resources) bearer
  • the emergency dedicated bearer is a GBR bearer.
  • FIG. 2 is a schematic diagram of the process of initiating an IMS normal service registration by the UE with the normal subscription and the unrestricted access to the SAE, and the process of initiating the IMS normal service registration by using the emergency bearer, including the following steps: Step 201: The UE initiates to the MME An emergency attach request or an emergency PDN connection establishment request (collectively referred to as an emergency bearer setup request), where the request carries an emergency identifier;
  • the UE When the UE initiates an emergency PDN connection establishment request, the UE has been normally attached to the SAE. Network, and there is a normal PDN connection.
  • Step 202 The MME selects a P-GW, and initiates a default bearer request to the P-GW to establish an emergency bearer (that is, an emergency default bearer for establishing an emergency PDN connection);
  • Step 203 After receiving the default bearer request, the P-GW carries the IP address of the P-CSCF and the UE corresponding to the emergency bearer (or the emergency PDN connection) in the setup default bearer response message returned to the MME. IP address;
  • Step 204 After receiving the default bearer response sent by the P-GW, the MME returns an emergency attach response or an emergency PDN connection setup response to the UE, where the IP address of the P-CSCF and the emergency bearer are corresponding (or the above) The IP address of the UE corresponding to the emergency PDN connection;
  • the P-CSCF initiates the registration request of the IMS normal service; since the IMS network side does not know whether the current UE is urgently attached in the SAE or uses the emergency PDN connection (ie, the IMS network side does not know that the UE is using the emergency bearer to initiate the registration of the IMS normal service) Request), therefore the IMS network side accepts the registration request for the normal service of the IMS;
  • Step 206 The UE performs an IMS normal service by using an emergency bearer, for example, an IMS session with the IMS service peer.
  • an emergency bearer for example, an IMS session with the IMS service peer.
  • the UE establishes an emergency bearer by urgently attaching to the SAE network or by establishing an emergency PDN connection to the SAE network, but uses the emergency bearer to perform non-emergency IMS normal service on the IMS network; Will lead to the following problems:
  • the SAE is inconsistent with the user data in the IMS, that is, the UE is recorded in the SAE network to establish an emergency bearer, and the IMS network records that the UE is performing normal IMS service;
  • the IMS network element for example, the P-CSCF
  • the emergency bearer the emergency default bearer
  • Registration which in turn prevents UEs from using emergency
  • the bearer performs normal IMS services.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method and system for establishing an IMS service, so as to prevent the UE from using the emergency bearer to perform normal IMS services.
  • the present invention provides a method for establishing an IMS service of an IP multimedia subsystem, the method comprising:
  • the P-CSCF rejects the non-emergency registration request received on the emergency connection.
  • the method is applicable to a system architecture evolution SAE network and a general wireless packet service GPRS network.
  • the emergency connection is an emergency packet data network PDN connection of the SAE;
  • the emergency connection is an emergency packet data protocol PDP context of GPRS.
  • the steps of the P-CSCF rejecting the non-emergency registration request received on the emergency connection include:
  • the P-GW returns an IP address of the first proxy call session control function P-CSCF supporting only the IP multimedia subsystem IMS emergency service to the UE through the mobility management entity MME, and sets the first P-CSCF
  • the first P-CSCF rejects the registration request for non-emergency purposes received on the emergency connection for the sole purpose P-CSCF of the IMS service initiated by the emergency bearer mentioned above;
  • the P-GW returns an IP address for emergency service only planned by the operator to the UE through the MME, and the second P-CSCF pre-configured by the operator for the IP address of the emergency service only refuses the emergency connection.
  • the non-emergency destination registration request received on the second P-CSCF, the IP address only used for the emergency service pre-configured by the operator on the second P-CSCF and the operator plan returned by the P-GW to the UE are only used for The IP address of the emergency service is consistent;
  • the P-CSCF rejects the non-tightness received on the emergency connection.
  • the steps of the urgent registration request include:
  • step B Gateway General Packet Radio Service Support Node After the GGSN establishes a GPRS emergency PDP context for the user equipment UE, perform step B or step ⁇ ';
  • the GGSN returns an IP address of the first P-CSCF supporting only the IMS emergency service to the UE by serving the general packet radio service support node SGSN, and sets the first P-CSCF to be initiated using the GPRS emergency PDP context.
  • the only destination P-CSCF of the IMS service request, the first P-CSCF rejects the non-urgent purpose registration request received on the emergency connection;
  • the GGSN returns an IP address for emergency service only planned by the operator to the UE through the SGSN, and the second P-CSCF pre-configured by the operator for the IP address of the emergency service only refuses to receive the emergency connection.
  • the non-emergency destination registration request wherein the IP address that is only pre-configured by the operator on the second P-CSCF and used by the GGSN to return to the UE is only used for emergency services.
  • the addresses are the same.
  • the emergency bearer is an emergency default bearer connected by an emergency packet data network PDN.
  • the step of the first P-CSCF or the second P-CSCF rejecting the non-emergency destination registration request received on the emergency connection includes the step C:
  • the UE uses the emergency bearer to initiate an IMS service request, and after receiving the IMS service request, the P-GW determines whether the destination P-CSCF of the IMS service request is the first P-CSCF or the a second P-CSCF, if yes, forwarding the IMS service request to the first P-CSCF or the second P-CSCF; otherwise not forwarding the IMS service request;
  • the step of the first P-CSCF or the second P-CSCF rejecting a non-emergency destination registration request received on the emergency connection includes the step F:
  • the UE initiates an IMS service request by using the GPRS emergency PDP context, and after receiving the IMS service request, the GGSN determines whether the destination P-CSCF of the IMS service request is the first P-CSCF or the And the second P-CSCF, if yes, forwarding the IMS service request to the first P-CSCF or the second P-CSCF; otherwise, the IMS service request is not forwarded.
  • the step of the first P-CSCF or the second P-CSCF rejecting the non-emergency destination registration request received on the emergency connection includes the step C' :
  • the UE sends an IMS service request by using the emergency bearer, and the IMS service request is forwarded by the P-GW to the first P-CSCF or the second P-CSCF, where the first P-CSCF After the second P-CSCF receives the IMS service request forwarded by the P-GW, after determining that the IMS service request is an IMS normal service request, rejecting the IMS normal service request;
  • the step of the first P-CSCF or the second P-CSCF rejecting the non-emergency registration request received on the emergency connection when the GPRS network is applicable includes the step F:
  • the UE initiates an IMS service request by using the GPRS emergency PDP context, by using the
  • the GGSN forwards the IMS service request to the first P-CSCF or the second P-CSCF, where the first P-CSCF or the second P-CSCF receives the IMS service forwarded by the GGSN After the request, after determining that the IMS service request is an IMS normal service request, rejecting the IMS normal service request. Further, in the steps C' and F, the first P-CSCF or the second P-CSCF rejects the IMS normal service request in the following manner:
  • a response message rejecting the IMS normal service-purification request to the UE and including the first P in a response message rejecting the IMS normal service request
  • the -CSCF or the second P-CSCF only supports information of emergency services or information that the UE cannot perform normal IMS services. Further, when the method is applicable to the SAE network, when the P-GW returns the IP address of the first P-CSCF or the second P-CSCF to the UE, the P-GW also returns the first P to the UE. - the CSCF or the second P-CSCF only supports indication information of emergency services;
  • the invention also provides a system for establishing an IMS service, the system comprising: a P-CSCF, which is provided Set a request to reject a non-urgent purpose registration received on an emergency connection. Further, the system further includes: an MME and a P-GW. At this time, the system is applicable to the SAE network, where:
  • the P-GW is configured to establish an emergency bearer by the UE, and then return the IP address of the P-CSCF to the UE by using the MME, and set the P-CSCF to the sole purpose of using the emergency bearer initiated IMS service request.
  • P-CSCF ;
  • the P-GW is further configured to establish an emergency bearer for the UE, and then return, to the UE, the IP address that is planned by the operator for the emergency service only by the MME;
  • the P-CSCF is further configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject the non-urgent purpose registration request received on the emergency connection;
  • the IP address pre-configured by the operator on the P-CSCF only for the emergency service is the same as the IP address that the P-GW returns to the UE for the emergency service only for the emergency service.
  • the emergency bearer is an emergency default bearer connected by an emergency packet data network PDN.
  • the P-GW is further configured to: after receiving the IMS service request initiated by the UE by using the emergency bearer, determine whether the target P-CSCF of the IMS service request is the P-CSCF, and if yes, The IMS service request is forwarded to the P-CSCF; otherwise the IMS service request is not forwarded. Further, the P-GW is further configured to forward the IMS service request to the P-CSCF when the UE initiates an IMS service request by using the emergency bearer;
  • the P-CSCF is further configured to, after receiving the IMS service request forwarded by the P-GW, determine that the IMS service request is an IMS normal service request, and reject the IMS normal service request.
  • the P-CSCF is further configured to reject the IMS normal service request in the following manner:
  • the P-CSCF returns a response message rejecting the IMS normal service request to the UE, and includes, in the response message rejecting the IMS normal service request, that the P-CSCF only supports emergency service information or the UE cannot perform normal IMS service. Business information.
  • the P-GW is further configured to, when returning the IP address of the P-CSCF to the UE, return, to the UE, indication information that the P-CSCF supports only emergency services.
  • the system further includes: an SGSN and a GGSN, and the system is applicable to the SAE network, where:
  • the SGSN returns an IP address of the P-CSCF to the UE, and sets the P-CSCF to a unique destination P-CSCF that uses the GPRS emergency PDP context initiated IMS service request;
  • the GGSN is further configured to establish a GPRS emergency PDP context by the UE, and then return an IP address for emergency service only planned by the operator to the UE through the SGSN;
  • the P-CSCF is further configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject the non-urgent purpose registration request received on the emergency connection;
  • the IP address pre-configured by the operator on the P-CSCF only for the emergency service is the same as the IP address only for the emergency service planned by the operator returned by the GGSN to the UE.
  • the GGSN is further configured to: after receiving the IMS service request initiated by the UE using the GPRS emergency PDP context, determine whether the target P-CSCF of the IMS service request is the P-CSCF, and if yes, The IMS service request is forwarded to the P-CSCF; otherwise the IMS service request is not forwarded.
  • the GGSN is further configured to forward the IMS service request to the P-CSCF when the UE initiates an IMS service request by using the GPRS emergency PDP context;
  • the P-CSCF is further configured to, after receiving the IMS service request forwarded by the GGSN, determine that the IMS service request is an IMS normal service request, and reject the IMS normal service request.
  • the P-CSCF is further configured to reject the IMS normal service request in the following manner:
  • the P-CSCF returns a response message rejecting the IMS normal service request to the UE, and includes, in the response message rejecting the IMS normal service request, that the P-CSCF only supports emergency service information or the UE cannot perform normal IMS service. Business information.
  • the GGSN is further configured to, when returning the IP address of the P-CSCF to the UE, return, to the UE, indication information that the P-CSCF supports only emergency services.
  • the present invention also provides a P-GW, wherein
  • the P-GW is configured to establish an emergency bearer by the UE, and then return an IP address of the first P-CSCF that only supports the IP multimedia subsystem IMS emergency service to the UE by using the MME, and set the first P-CSCF to use the foregoing
  • the P-GW is configured to establish an emergency bearer for the UE, and then return the IP address of the emergency service only planned by the operator to the UE through the MME, so that the IP address pre-configured by the operator for the emergency service is second.
  • the P-CSCF rejects the non-emergency destination registration request received on the emergency connection, wherein the IP address pre-configured by the operator on the second P-CSCF for emergency service only and the P-GW to the UE
  • the returned carrier's planned IP address is only used for emergency services.
  • the present invention also provides a P-CSCF, wherein:
  • the P-CSCF is configured to support only the IP Multimedia Subsystem IMS Emergency Service, and the P-CSCF is a unique destination P-CSCF for the IMS service request initiated by the P-GW for the emergency bearer established by the UE, so that the The P-CSCF rejects the non-emergency registration request received on the emergency connection; or
  • the P-CSCF is configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject a non-emergency destination registration request received on the emergency connection; wherein the operator is in the P-CSCF
  • the IP address pre-configured for the emergency service only is consistent with the IP address of the P-GW that is only used for the emergency service by the operator that the MME returns to the UE.
  • the present invention also provides a GGSN, wherein
  • the GGSN is configured to establish a GPRS emergency PDP context for the UE, and then return an IP address of the first P-CSCF that only supports the IP Multimedia Subsystem IMS emergency service to the UE through the SGSN, and set the first P-CSCF to use the foregoing
  • the GGSN is configured to establish a GPRS emergency PDP context for the UE, and then return an IP address for the emergency service planned by the operator to the UE through the SGSN, so that the IP address pre-configured by the operator for the emergency service is second.
  • the P-CSCF rejects the non-emergency destination registration request received on the emergency connection, wherein the IP address pre-configured by the operator on the second P-CSCF for emergency service only and the GGSN return to the UE
  • the IP addresses that the operator plans for emergency services only are the same.
  • the present invention also provides a P-CSCF, wherein:
  • the P-CSCF is configured to support only the IP Multimedia Subsystem IMS Emergency Service, the P-CSCF being the only destination P-CSCF for the IMS Service Request initiated by the GGSN for the GPRS Emergency PDP Context established by the UE, such that the The P-CSCF rejects the non-emergency registration request received on the emergency connection; or
  • the P-CSCF is configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject a non-emergency destination registration request received on the emergency connection; wherein the operator is in the P-CSCF
  • the IP address pre-configured for emergency service only is consistent with the IP address of the GGSN that is returned by the SGSN to the UE and is only used for emergency services.
  • the present invention sets the emergency P-CSCF supporting only the IMS emergency service on the IMS network side, and sets the emergency P-CSCF to the P-GW as the sole purpose of the IMS service request initiated by the emergency default bearer.
  • -CSCF which prevents the UE from using the emergency bearer to initiate the registration of the IMS normal service, thereby preventing the UE from using the emergency bearer for the IMS normal service.
  • Figure 1 depicts the primary network element involved in the emergency call of the UE to access the IMS through the SAE.
  • Figure 2 depicts the establishment of an emergency bearer initiated by the UE with normal subscription and unrestricted access to the SAE in the IMS. The process of initiating normal registration;
  • FIG. 3 is a general flowchart of a method for establishing an IMS service according to a first embodiment of the present invention
  • 4 is a flowchart of a method for establishing an IMS service according to a first embodiment of the present invention
  • FIG. 5 is a second flowchart of a method for establishing an IMS service according to a first embodiment of the present invention
  • FIG. 6 is a first embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of an IMS service establishment system in a first embodiment of the present invention
  • FIG. 8 is a main network involved in an emergency call of a UE (or MS) accessing an IMS through GPRS; yuan;
  • FIG. 9 is a flowchart of a method for establishing an IMS service according to a second embodiment of the present invention.
  • FIG. 10 is a second flowchart of a method for establishing an IMS service according to a second embodiment of the present invention.
  • FIG. 11 is a third flowchart of a method for establishing an IMS service according to a second embodiment of the present invention. Preferred embodiment of the invention
  • FIG. 3 is a flowchart of a method for establishing an IMS service according to the present invention
  • FIG. 3 is a flowchart of a method for establishing an SAE emergency bearer (or an SAE emergency service) and using the emergency bearer to initiate an IMS emergency service, and specifically includes the following steps:
  • Step 301 The UE initiates an emergency bearer setup request to the MME, where the request carries an emergency identifier; the emergency identifier may be an emergency APN;
  • the emergency bearer setup request is an emergency attach request or an emergency PDN connection setup request.
  • the UE initiates an emergency PDN connection establishment request, the UE has normally attached to the SAE network and has a normal PDN connection.
  • Step 302 The MME parses the P-GW corresponding to the emergency identifier by using the domain name system, or selects a P-GW that supports the emergency service according to the local configuration, and initiates a default bearer request to the P-GW to establish an emergency bearer (that is, establishes an emergency bearer). Emergency default bearer for emergency PDN connections);
  • Step 303 After receiving the default bearer request, the P-GW returns a default bearer response to the MME.
  • the default bearer response carries the IP address of the P-CSCF and the emergency bearer (or the emergency PDN connection).
  • the P-GW is set to use the emergency default bearer of the emergency PDN connection (may be using emergency bearer/emergency PDN)
  • the data packet sent by the IP address corresponding to the connection and the bearer identifier of the default bearer can only be routed to the P-CSCF, that is, the P-CSCF is set to use the emergency bearer (ie, the emergency default bearer of the emergency PDN connection).
  • the response may also carry the indication information that the P-CSCF can only be used for the IMS emergency service (referred to as the emergency P-CSCF indication), and the indication information is used to notify the UE to use and use only the P-CSCF to initiate the IMS emergency service. .
  • the emergency P-CSCF indication the indication information that the P-CSCF can only be used for the IMS emergency service.
  • the above P-CSCF in the present invention is a P-CSCF dedicated to IMS emergency services, and may be referred to as an emergency P-CSCF.
  • the routing restriction of the IMS service request set by the P-GW to the UE is only for the emergency default bearer, and there is no such routing restriction for the emergency dedicated bearer.
  • Step 304 After receiving the default bearer response sent by the P-GW, the MME returns an emergency attach response or an emergency PDN connection setup response to the UE, where the IP address of the P-CSCF and the emergency bearer are corresponding (or the above) The IP address of the UE corresponding to the emergency PDN connection; in addition, the emergency attachment response or the emergency PDN connection establishment response may also carry the emergency
  • Step 305 After receiving the emergency attach response or the emergency PDN establishment response, the UE uses the IP address of the UE carried in the emergency (the IP address corresponding to the emergency bearer/emergency PDN connection), and the emergency default bearer connected to the emergency PDN.
  • - GW initiates a registration request for IMS emergency service to the emergency P-CSCF;
  • the P-GW After receiving the registration request of the IMS emergency service, the P-GW determines whether the requested P-CSCF is an emergency P-CSCF (ie, determines whether it is a request sent to the emergency P-CSCF), and if so, the P-GW The registration request is forwarded to the emergency P-CSCF; in this embodiment, since the destination P-CSCF of the request is an emergency P-CSCF, the request is not discarded.
  • the emergency P-CSCF is a P-CSCF that is only set to support emergency services, it is urgent.
  • the P-CSCF also accepts the registration request and completes the subsequent IMS registration process.
  • Step 306 After completing the registration of the IMS emergency service, the UE may perform an IMS emergency call with the PSAP.
  • 4 is a second flowchart of a method for establishing an IMS service according to the present invention.
  • FIG. 4 illustrates a UE establishing an SAE emergency bearer (or SAE emergency service), and using the emergency bearer to initiate an IMS service request to a non-emergency P-CSCF is lost.
  • the abandoned process includes the following steps:
  • Steps 401 to 404 are the same as steps 301 to 304, and are not described here.
  • Step 405 After receiving the emergency attach response or the emergency PDN establishment response, the UE uses the IP address of the UE (the IP address corresponding to the emergency bearer/emergency PDN connection), and the emergency default bearer connected to the emergency PDN connection.
  • - GW initiates an IMS service request to the non-emergency P-CSCF; the P-GW is set to use the emergency default bearer of the emergency PDN connection (may be the IP address corresponding to the emergency bearer/emergency PDN connection and the bearer identifier of the default bearer)
  • the transmitted data packet can only be routed to the emergency P-CSCF, so the P-GW does not forward (can directly discard) the IMS service request data packet.
  • FIG. 5 is a third flowchart of a method for establishing an IMS service according to the present invention.
  • FIG. 5 illustrates that a UE establishes a SAE emergency bearer (or SAE emergency service), and uses the emergency bearer to initiate an IMS normal service rejection to the emergency P-CSCF.
  • the process specifically includes the following steps:
  • Steps 501 to 504 are the same as steps 301 to 304, and are not described here.
  • Step 505 After receiving the emergency attach response or the emergency PDN establishment response, the UE uses the IP address of the UE carried in the emergency (the IP address corresponding to the emergency bearer/emergency PDN connection), and the emergency default bearer connected to the emergency PDN.
  • - GW initiates a registration request for IMS normal service to the emergency P-CSCF, and the request is sent by the P-GW to the emergency P-CSCF;
  • Step 506 After receiving the registration request, the emergency P-CSCF determines that the registration request is a registration request for the IMS normal service, and because the emergency P-CSCF only supports the emergency service, the emergency P-CSCF rejects the registration request (for example, an emergency)
  • the P-CSCF returns a response message rejecting the registration request to the UE, where the message may carry the reason for the rejection, that is, the P-CSCF only supports emergency services, or the UE cannot perform normal IMS services.
  • FIG. 6 is a schematic diagram of a method for planning an address space for an emergency service according to the present invention, to prevent a UE from using an emergency bearer for normal IMS service. Steps 601 and 602 are the same as steps 301 and 302;
  • step 603 the difference from step 303 is that the address allocated by the P-GW to the UE is an IP address of the operator only for emergency services.
  • Step 604 The UE acquires the foregoing IP address.
  • Step 605 The UE initiates an IMS normal registration request to the P-CSCF by using the foregoing address.
  • the P-CSCF analyzes the IP address of the UE in the normal registration request, and considers that the IP address can only be used for emergency services.
  • the received normal registration request is illegal, and the IMS of the user is rejected. Normal registration request.
  • the IP address of the emergency service that is pre-configured by the operator on the P-CSCF is the same as the IP address of the emergency service that the P-GW allocates to the UE.
  • FIG. 7 is a schematic structural diagram of an IMS service establishment system according to the present invention. As shown in FIG. 7, the system includes: an MME, a P-GW, and an emergency P-CSCF supporting only IMS emergency services;
  • the MME After the P-GW is set as the emergency default bearer for the UE to establish an emergency PDN connection, the MME returns the IP address of the emergency P-CSCF and the IP address corresponding to the emergency PDN connection to the UE, and sets the emergency P-CSCF to use the emergency.
  • the P-GW After receiving the IMS service request initiated by the UE using the emergency default bearer, the P-GW determines whether the destination P-CSCF of the IMS service request is an emergency P-CSCF, and if yes, forwards the IMS service request to the emergency P-CSCF. If not, the IMS service request is not forwarded.
  • the emergency P-CSCF After receiving the IMS service request forwarded by the P-GW, the emergency P-CSCF determines whether the service request is an IMS normal service request, and if so, rejects the request.
  • the emergency P-CSCF may reject the IMS normal service request in the following manner:
  • the emergency P-CSCF returns a response message rejecting the IMS normal service request to the UE, and includes the emergency P-CSCF to support only the emergency service or the IMS normal service. Information.
  • the P-GW when the P-GW returns the IP address of the emergency P-CSCF and the IP address corresponding to the emergency bearer to the UE, the P-GW may also return the indication information that the P-CSCF supports only the emergency service to the UE.
  • the P-GW is further configured to establish an emergency bearer for the UE, and then return, by the MME, the IP address of the emergency service only planned by the operator to the UE;
  • the P-CSCF is further configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject the non-urgent purpose registration request received on the emergency connection;
  • the IP address pre-configured by the operator on the P-CSCF only for the emergency service is the same as the IP address that the P-GW returns to the UE for the emergency service only for the emergency service.
  • the present invention is also applicable to the GPRS (General Packet Radio Service) network because the GPRS network also supports the IMS service, including For emergency services, there are also technical problems mentioned in the prior art.
  • GPRS General Packet Radio Service
  • the control plane of the Serving GPRS Support Node is served.
  • the function is similar to that of the MME.
  • the user plane function of the SGSN is similar to that of the S-GW.
  • the Gateway General Packet Radio Service Node is similar to the P-GW function.
  • the UE is also called the mobile station (MS, Mobile Station).
  • a packet data protocol (PDP) context is established between the MS and the GGSN.
  • an emergency PDP context also called an emergency connection
  • Figure 9, 10, and 11 are the GPRS access IMS processes, respectively, and SAE access to IMS Figure 4
  • FIG. 9 illustrates a process in which a UE establishes a GPRS emergency PDP context and uses the emergency PDP context to initiate an IMS service request to the non-emergency P-CSCF, and the method includes the following steps: Step 901: The UE initiates an emergency PDP context establishment request to the SGSN.
  • the above request carries an emergency identifier; the emergency identifier may be an emergency APN;
  • Step 902 The SGSN parses the GGSN corresponding to the emergency identifier by using the domain name system, or selects a GGSN supporting the emergency service according to the local configuration, and initiates a PDP context request to the GGSN to establish an emergency PDP context.
  • Step 903 After receiving the foregoing request, the GGSN returns a setup PDP context response to the SGSN, where the setup response carries the IP address of the P-CSCF and the IP address of the UE corresponding to the emergency PDP context, and the GGSN is configured to use the
  • the data packet sent by the emergency PDP context can only be routed to the P-CSCF, that is, the P-CSCF is set to the unique destination P-CSCF of the data packet sent by using the IP address corresponding to the emergency PDP context;
  • the response may also carry the indication information that the P-CSCF can only be used for the IMS emergency service (referred to as the emergency P-CSCF indication), and the indication information is used to notify the UE to use and use only the P-CSCF to initiate the IMS emergency service. .
  • the emergency P-CSCF indication the indication information that the P-CSCF can only be used for the IMS emergency service.
  • the above P-CSCF in the present invention is a P-CSCF dedicated to IMS emergency services, and may be referred to as an emergency P-CSCF.
  • Step 904 After receiving the PDP context response sent by the GGSN, the SGSN returns a PDP context setup response to the UE, where the IP address of the P-CSCF and the IP address of the UE corresponding to the emergency PDP context are carried.
  • the emergency P-CSCF indication may also be carried in the emergency PDP setup response.
  • Step 905 After receiving the emergency PDP context establishment response, the UE uses the UE carried therein.
  • the IP address in the emergency PDP context, initiates an IMS service request to the non-emergency P-CSCF through the GGSN; since the GGSN is configured to use the emergency PDP context to send data packets that can only be routed to the emergency P-CSCF, the GGSN does not forward (may Directly discard) the IMS service request packet.
  • FIG. 10 illustrates a process in which a UE establishes a GPRS emergency PDP context and initiates an IMS normal service rejection to the emergency P-CSCF by using the emergency PDP context, and specifically includes the following steps: Steps 1001 to 1004, which are the same as steps 901 to 904, where No longer;
  • Step 1005 After receiving the emergency PDP context establishment response, the UE uses the IP address of the UE carried therein, and initiates a registration request for the IMS normal service to the emergency P-CSCF through the GGSN in the emergency PDP context, and the request is sent to the emergency by the GGSN.
  • P-CSCF Packet Control Function
  • Step 1006 After receiving the foregoing registration request, the emergency P-CSCF determines that the registration request is a registration request for the IMS normal service, and since the emergency P-CSCF only supports the emergency service, the emergency P-CSCF rejects the registration request (for example, an emergency) The P-CSCF returns a response message rejecting the registration request to the UE, The reason for the rejection may be carried in the message, that is, the P-CSCF only supports emergency services, or the UE cannot perform normal IMS services.
  • FIG. 11 is a schematic diagram of a method for planning an address space for emergency services according to the present invention to prevent a UE from using an emergency PDP context for normal IMS services.
  • Steps 1101 and 1102 are the same as steps 901 and 902;
  • step 1103 the difference from step 903 is that the address allocated by the GGSN to the UE is an IP address that is only used by the operator for emergency services.
  • Step 1104 The UE acquires the foregoing IP address.
  • Step 1105 The UE initiates an IMS normal registration request to the P-CSCF by using the foregoing address.
  • Step 1106 The operator pre-configures an IP address planned for the emergency service only on the P-CSCF (the configuration here and the GGSN in step 1103) The above configuration is the same.
  • the P-CSCF analyzes the IP address of the UE in the normal registration request, and considers that the IP address can only be used for emergency services.
  • the received normal registration request is illegal, and the IMS normal registration of the user is rejected. request.
  • the present invention also provides a P-GW, wherein
  • the P-GW is configured to establish an emergency bearer by the UE, and then return an IP address of the first P-CSCF that only supports the IP multimedia subsystem IMS emergency service to the UE by using the MME, and set the first P-CSCF to use the foregoing
  • the P-GW is configured to establish an emergency bearer for the UE, and then return the IP address of the emergency service only planned by the operator to the UE through the MME, so that the IP address pre-configured by the operator for the emergency service is second.
  • the P-CSCF rejects the non-emergency registration request received on the emergency connection,
  • the IP address that is only used for the emergency service that is pre-configured by the operator on the second P-CSCF is the same as the IP address that is only used for the emergency service by the operator that the P-GW returns to the UE.
  • the present invention also provides a P-CSCF, wherein:
  • the P-CSCF is configured to support only the IP Multimedia Subsystem IMS Emergency Service, and the P-CSCF is a unique destination P-CSCF for the IMS service request initiated by the P-GW for the emergency bearer established by the UE, so that the The P-CSCF rejects the non-emergency registration request received on the emergency connection; or
  • the P-CSCF is configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject a non-emergency destination registration request received on the emergency connection; wherein the operator is in the P-CSCF
  • the IP address pre-configured for the emergency service only is consistent with the IP address of the P-GW that is only used for the emergency service by the operator that the MME returns to the UE.
  • the present invention also provides a GGSN, wherein
  • the GGSN is configured to establish a GPRS emergency PDP context for the UE, and then return an IP address of the first P-CSCF that only supports the IP Multimedia Subsystem IMS emergency service to the UE through the SGSN, and set the first P-CSCF to use the foregoing
  • the sole purpose P-CSCF of the IMS emergency PDP context initiated IMS service request such that the first P-CSCF rejects the non-urgent purpose registration request received on the emergency connection; or
  • the GGSN is configured to establish a GPRS emergency PDP context for the UE, and then return an IP address for the emergency service planned by the operator to the UE through the SGSN, so that the IP address pre-configured by the operator for the emergency service is second.
  • the P-CSCF rejects the non-emergency destination registration request received on the emergency connection, wherein the IP address pre-configured by the operator on the second P-CSCF for emergency service only and the GGSN return to the UE
  • the IP addresses that the operator plans for emergency services only are the same.
  • the present invention also provides a P-CSCF, wherein:
  • the P-CSCF is configured to support only IP Multimedia Subsystem IMS Emergency Services, the P-CSCF The only destination P-CSCF for the IMS service request initiated by the GGSN for the GPRS emergency PDP context established by the UE, such that the P-CSCF rejects the non-urgent purpose registration request received on the emergency connection;
  • the P-CSCF is configured to be pre-configured by the operator for an IP address only for emergency services; and is further configured to reject a non-emergency destination registration request received on the emergency connection; wherein the operator is in the P-CSCF
  • the IP address pre-configured for emergency service only is consistent with the IP address of the GGSN that is returned by the SGSN to the UE and is only used for emergency services.
  • all of the emergency P-CSCFs mentioned above may also be logical modules corresponding to a special interface on the ordinary P-CSCF, that is, the ordinary P-CSCF includes an emergency P-CSCF function.
  • the present invention implements an emergency P-CSCF that supports only IMS emergency services, and sets the emergency P-CSCF to the P-CSCF of the IMS service request initiated by the emergency default bearer.
  • the UE is prevented from using the emergency default bearer to initiate registration of the IMS normal service, thereby preventing the UE from using the emergency bearer to perform the normal IMS service.
  • the present invention effectively sets the emergency P-CSCF supporting only the IMS emergency service on the IMS network side, and sets the emergency P-CSCF to the P-CSCF of the IMS service request initiated by the emergency default bearer.
  • the UE is prevented from using the emergency bearer to initiate registration of the IMS normal service, thereby preventing the UE from using the emergency bearer for normal IMS service, and thus has strong industrial applicability.

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Description

一种 IP多媒体子系统业务的建立方法及系统
技术领域
本发明涉及通信领域, 尤其涉及一种因特网协议(IP, Internet Protocol ) 多媒体子系统业务的建立方法及系统。 背景技术
IP多媒体子系统 ( IMS, IP Multimedia Core Network Subsystem )是新一 代通讯网络的核心, 它釆用了会话发起协议( SIP, Session Initiation Protocol ) 体系。 SIP与接入无关, 并具备媒体业务控制功能与承载分离、 呼叫与会话分 离、 应用与服务分离、 业务与网络分离、 以及移动网与因特网业务融合等多 种能力。
由于 IMS和接入无关, IMS下的紧急业务(EMC, Emergency Call )可 以建设在通用无线分組业务( GPRS, General Packet Radio Service ) 网络、 系 统架构演进(SAE, System Architecture Evolution ) 网络上, 提供统一的紧急 呼叫控制。
图 1示出了用户设备 ( UE, User Equipment )通过 SAE接入 IMS的紧急 呼叫所涉及的主要网元; 其中, 实线表示信令, 虚线表示用户的 IP通道。
如图 1所示, UE通过 SAE接入 IMS的紧急呼叫所涉及的主要网元包括: SAE 网络部分的网元、 位置服务(LCS, Location Service )部分的网元以及 IMS紧急业务部分的网元。
其中, SAE网络部分的网元设置成提供底层的承载管理和移动性管理。 SAE 网络部分的网元包括: 增强的无线基站 (eNodeB ) 、 移动性管理实体 ( MME, Mobility Management Entity )、 以及用户面数据路由处理网元( SAE GW ); SAE GW包括分组数据网网关( P-GW, Packet Data Network Gateway ) 和服务网关 (S-GW, Serving GW )。
MME负责管理和存储 UE的上下文(例如, UE标识 /用户标识、 移动性 管理状态、 用户安全参数等) , 为用户分配临时标识, 当 UE驻扎在跟踪区 域或者网络时, 负责对 UE进行鉴权。
P-GW是 SAE系统内的移动锚点 ,是 SAE与分组数据网絡( PDN, Packet Data Network ) 的边界网关, 负责 PDN的接入、 在 SAE与 PDN间转发数据 等功能。
策略计费控制 (PCC, Policy and Charging Control ) 网元设置成在底层承 载层和上层业务层建立有效的策略、 计费控制。 PCC网元包括: 策略和计费 规则功能 (PCRF, Policy and Charging Rules Function ) 、 策略和计费执行功 能 ( PCEF, Policy and Charging Enforcement Function ) 。
其中, PCRF是 PCC架构的重要功能实体, 设置成控制策略和计费规则 的获取、 装配、 下发等。 PCEF是具体的策略和计费的执行点, 通常位于网关 ( GW ) 功能中; 在 SAE网络中, PCEF功能位于 P-GW中。
LCS 部分的网元设置成为紧急呼叫提供位置服务和公共安全应答点 ( PSAP, Public Safety Answering Point )的地址。 LCS部分的网元包括: 位置 请求功能(LRF, Location Require Function ) , LRF是一个逻辑功能实体, 定 义在紧急呼叫架构中,为紧急呼叫会话控制功能( E-CSCF, Emergency-CSCF ) 提供用户的位置, 并基于该位置查找合适的 PSAP。 网关移动定位中心 ( GMLC, Gateway Mobile Location Center )是核心网中提供用户定位功能的 主要功能点; 通常, LRF属于 GMLC的一部分。
IMS紧急业务部分的网元设置成控制和处理紧急呼叫的会话。其中, IMS 紧急业务部分的网元包括:
归属用户服务器(HSS, Home Subscriber Server ) , 主要设置成管理用户 的签约数据, 位于归属网;
呼叫会话控制功能(CSCF, Call Session Control Function ) , 是控制会话 过程的核心网元, CSCF包括代理呼叫会话控制功能( P-CSCF, Proxy-CSCF )、 查询呼叫会话控制功能 (I-CSCF, Interrogating-CSCF ) 、 服务呼叫会话控制 功能 (S-CSCF, Serving-CSCF ) 、 E-CSCF。 其中, E-CSCF是紧急呼叫的会 话控制中心, 决定紧急呼叫应该路由到哪个 PSAP。
对于一个受限制模式下的 UE (例如, UE欠费或 UE的区域受限制等), 发起紧急呼叫需要执行如下步骤:
步骤 1 , 建立紧急默认承载;
UE发起紧急附着, 即 UE在发起普通附着时, 携带紧急标识, 以告知承 载网络当前附着是为了拨打紧急电话; 承载网络接收到 UE的紧急附着请求 后, 通过一个紧急接入点名称( E-APN, Emergency Access Point Name )来建 立一个专门用于紧急呼叫的缺省承载 (也叫默认承载, 可以称为紧急默认承 载) , 这个缺省承载主要用于信令控制。
步骤 2, 发起紧急呼叫, 建立紧急专有承载 ( dedicated bearer ) ;
UE发起紧急呼叫, 即通过在一个正常的 INVITE (邀请 ) 消息中携带紧 急标识,表明这个呼叫请求是一个紧急呼叫; UE在被叫号码中填写紧急号码, 如果 UE在拜访地, 则该紧急号码是拜访地的紧急号码; 紧急呼叫被路由到 E-CSCF, E-CSCF通过 LRF查询 PSAP的地址; LRF通过查询 UE的位置信 息来决定为 UE服务的 PSAP是哪个; E-CSCF在获得了 PSAP地址后, 即将 呼叫路由到 PSAP。 此时将在紧急 PDN连接 (也称为紧急连接 ) 上建立一个 紧急专有承载用于紧急语音业务。
需要注意的是, 紧急 PDN连接(也称为紧急连接)的紧急承载包括: 紧 急默认承载和紧急专有承载, 前者用于承载信令, 后者用于承载媒体(如语 音数据 ) , UE在上述紧急承载中使用相同的 IP地址。 UE和网络可以通过如 下方法区分紧急默认承载和紧急专有承载:
1. 通过承载标识 (Bearer ID ) , 和 /或
2. 承载的服务质量(QoS, Quality of Service )信息, 即紧急默认承载是 非保证比特率资源 (Non-GBR, Non Guaranteed Bitrate Resources )承载, 紧 急专有承载是 GBR承载。
图 2描述了现有技术中签约正常且接入不受限的 UE向 SAE发起紧急承 载的建立,并通过该紧急承载发起 IMS正常业务注册的流程, 包括如下步骤: 步骤 201 , UE向 MME发起紧急附着请求或紧急 PDN连接建立请求(统 称为紧急承载建立请求) , 上述请求中携带紧急标识;
其中, 当 UE发起紧急 PDN连接建立请求时, UE已经正常附着到 SAE 网络, 并且有正常的 PDN连接。
步骤 202, MME选择一个 P-GW,并向该 P-GW发起建立默认承载请求, 以建立紧急承载 (即建立紧急 PDN连接的紧急默认承载) ;
步骤 203, P-GW收到建立默认承载请求后, 在返回给 MME的建立默认 承载响应消息中携带一个 P-CSCF的 IP地址以及紧急承载所对应的 (或者说 紧急 PDN连接所对应的) UE的 IP地址;
步骤 204 , MME收到 P-GW发送的建立默认承载响应后, 向 UE回复紧 急附着响应或紧急 PDN连接建立响应,其中携带上述 P-CSCF的 IP地址以及 上述紧急承载所对应的(或者说上述紧急 PDN连接所对应的)UE的 IP地址; 步骤 205, UE使用已建立的紧急承载 (即使用上述紧急承载 /紧急 PDN 连接所对应的 UE的 IP地址) 以及上述 P-CSCF的 IP地址向对应的 P-CSCF 发起 IMS正常业务的注册请求;由于 IMS网络侧不知道当前 UE在 SAE中是 紧急附着或者是使用紧急 PDN连接(即 IMS网络侧不知道 UE是使用紧急承 载发起 IMS正常业务的注册请求) , 因此 IMS网络侧接受该 IMS正常业务 的注册请求;
步骤 206, UE使用紧急承载进行 IMS正常业务, 比如与 IMS业务对端 进行 IMS会话。
在图 2所示的流程中, UE通过紧急附着到 SAE网络、或通过建立到 SAE 网络的紧急 PDN连接建立了紧急承载, 但是却使用该紧急承载在 IMS 网络 进行非紧急的 IMS正常业务; 这将导致如下问题:
( 1 ) SAE与 IMS中的用户数据不一致, 即在 SAE网络中记录该 UE建 立了紧急承载, 而 IMS网络中记录该 UE正在进行 IMS正常业务;
( 2 ) 由于紧急业务不计费而 IMS正常业务会计费, 因此可能导致计费 错误;
( 3 )无法进行正确的网络控制。
但是, 现有技术中 IMS网元(例如 P-CSCF )由于无法获知 UE发起 IMS 正常业务的注册请求时是否使用了紧急承载 (紧急默认承载) , 因此无法避 免 UE使用紧急承载发起 IMS正常业务的注册, 进而无法避免 UE使用紧急 承载进行 IMS正常业务。 GPRS网络中也存在同样的问题。 发明内容
本发明所要解决的技术问题是, 克服现有技术的不足, 提供一种 IMS业 务的建立方法及系统, 以避免 UE使用紧急承载进行 IMS正常业务。
为了解决上述问题,本发明提供了一种 IP多媒体子系统 IMS业务的建立 方法, 该方法包括:
P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求。
进一步地, 所述方法适用于系统架构演进 SAE网络和通用无线分组业务 GPRS网络。
较佳地, 当所述方法适用于 SAE网络时, 所述紧急连接为 SAE的紧急 分组数据网 PDN连接;
当所述方法适用于 GPRS网络时, 所述紧急连接为 GPRS的紧急分组数 据协议 PDP上下文。
进一步地, 当所述方法适用于 SAE网络时, P-CSCF拒绝在紧急连接上 收到的非紧急目的的注册请求的所述步骤包括:
A、 分组数据网网关 P-GW为用户设备 UE建立紧急承载后, 执行步骤 B 或者步骤 Β';
Β、 所述 P-GW通过移动性管理实体 MME向 UE返回仅支持 IP多媒体 子系统 IMS紧急业务的第一代理呼叫会话控制功能 P-CSCF的 IP地址, 并将 所述第一 P-CSCF设置为使用上述紧急承载发起的 IMS业务倚求的唯一目的 P-CSCF,所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求;
B'、所述 P-GW通过 MME向 UE返回运营商规划的仅用于紧急业务的 IP 地址, 由运营商预配置了仅用于紧急业务的 IP地址的第二 P-CSCF拒绝在紧 急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF 上预配置的仅用于紧急业务的 IP地址与 P-GW向 UE返回的运营商规划的仅 用于紧急业务的 IP地址一致;
当所述方法适用于 GPRS网络时, P-CSCF拒绝在紧急连接上收到的非紧 急目的的注册请求的所述步骤包括:
D、 网关通用分组无线业务支持节点 GGSN为用户设备 UE建立 GPRS 紧急 PDP上下文后, 执行步骤 B或者步骤 Β';
Ε、所述 GGSN通过服务通用分组无线业务支持节点 SGSN向 UE返回仅 支持 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为 使用上述 GPRS紧急 PDP上下文发起的 IMS业务请求的唯一目的 P-CSCF, 所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求;
E'、 所述 GGSN通过 SGSN向 UE返回运营商规划的仅用于紧急业务的 IP地址, 由运营商预配置了仅用于紧急业务的 IP地址的第二 P-CSCF拒绝在 紧急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF 上预配置的仅用于紧急业务的 IP地址与 GGSN向 UE返回的运营商规划的仅 用于紧急业务的 IP地址一致。
进一步地, 当所述方法适用于 SAE网络时, 所述紧急承载为紧急分组数 据网 PDN连接的紧急默认承载。 进一步地, 当所述方法适用于 SAE网络时, 所述第一 P-CSCF或所述第 二 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包括 步骤 C:
C、 UE使用所述紧急承载发起 IMS业务请求 , 所述 P-GW收到所述 IMS 业务请求后,判断所述 IMS业务请求的目的 P-CSCF是否为所述第一 P-CSCF 或所述第二 P-CSCF, 如果是则将所述 IMS业务请求转发给所述第一 P-CSCF 或所述第二 P-CSCF; 否则不转发所述 IMS业务请求;
当所述方法适用于 GPRS网络时, 所述第一 P-CSCF或所述第二 P-CSCF 拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包括步骤 F:
F、 UE使用所述 GPRS紧急 PDP上下文发起 IMS业务请求, 所述 GGSN 收到所述 IMS业务请求后, 判断所述 IMS业务请求的目的 P-CSCF是否为所 述第一 P-CSCF或所述第二 P-CSCF,如果是则将所述 IMS业务清求转发给所 述第一 P-CSCF或所述第二 P-CSCF; 否则不转发所述 IMS业务请求。 进一步地, 当所述方法适用于 SAE网络时, 所述第一 P-CSCF或所述第 二 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包括 步骤 C':
C'、 UE使用所述紧急承载发起 IMS业务请求, 通过所述 P-GW向所述 第一 P-CSCF或所述第二 P-CSCF转发所述 IMS业务请求, 所述第一 P-CSCF 或所述第二 P-CSCF接收到所述 P-GW转发的所述 IMS业务倚求后, 确定所 述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请求; 当所述方法适用于 GPRS网络时, 所述第一 P-CSCF或所述第二 P-CSCF 拒绝在紧急连接上收到的非紧急目的的注册倚求的所述步骤包括步驟 F:
F、 UE使用所述 GPRS紧急 PDP上下文发起 IMS业务请求, 通过所述
GGSN向所述第一 P-CSCF或所述第二 P-CSCF转发所述 IMS业务请求, 所 述第一 P-CSCF或所述第二 P-CSCF接收到所述 GGSN转发的所述 IMS业务 请求后, 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正 常业务请求。 进一步地, 所述步骤 C'和 F , 所述第一 P-CSCF或所述第二 P-CSCF 采用如下方式拒绝所述 IMS正常业务请求:
所述第一 P-CSCF或所述第二 P-CSCF向 UE返回拒绝所述 IMS正常业务 -清求的响应消息, 并在拒绝所述 IMS正常业务请求的响应消息中包含所述第 一 P-CSCF或所述第二 P-CSCF仅支持紧急业务的信息或 UE不能进行 IMS 正常业务的信息。 进一步地, 当所述方法适用于 SAE网络时, 所述 P-GW向 UE返回所 述第一 P-CSCF或所述第二 P-CSCF的 IP地址时, 还向 UE返回所述第一 P-CSCF或所述第二 P-CSCF仅支持紧急业务的指示信息;
当所述方法适用于 GPRS 网络时, 所述 GGSN 向 UE返回所述第一 P-CSCF或所述第二 P-CSCF的 IP地址时, 还向 UE返回所述第一 P-CSCF或 所述第二 P-CSCF仅支持紧急业务的指示信息。 本发明还提供了一种 IMS业务的建立系统, 该系统包括: P-CSCF, 其设 置成拒绝在紧急连接上收到的非紧急目的的注册请求。 进一步地, 该系统还包含: MME及 P-GW, 此时, 该系统适用于 SAE 网络, 其中:
所述 P-GW设置成为 UE建立紧急承载 ,之后通过所述 MME向 UE返回 所述 P-CSCF的 IP地址, 并将所述 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF;
所述 P-GW还设置成为 UE建立紧急承载,之后通过 MME向 UE返回运 营商规划的仅用于紧急业务的 IP地址;
所述 P-CSCF还设置成由运营商预配置了仅用于紧急业务的 IP地址; 还 设置成拒绝在紧急连接上收到的非紧急目的的注册请求;
其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
进一步地, 所述紧急承载为紧急分组数据网 PDN连接的紧急默认承载。 进一步地, 所述 P-GW还设置成在接收到 UE使用所述紧急承载发起的 IMS业务请求后,判断所述 IMS业务请求的目的 P-CSCF是否为所述 P-CSCF, 如果是则将所述 IMS业务请求转发给所述 P-CSCF; 否则不转发所述 IMS业 务请求。 进一步地, 所述 P-GW还设置成当 UE使用所述紧急承载发起 IMS业务 请求时, 向所述 P-CSCF转发所述 IMS业务请求;
所述 P-CSCF还设置成在接收到所述 P-GW转发的所述 IMS业务请求后, 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请 求。
进一步地, 所述 P-CSCF还设置成采用如下方式拒绝所述 IMS正常业务 请求:
所述 P-CSCF向 UE返回拒绝所述 IMS正常业务请求的响应消息, 并在 拒绝所述 IMS正常业务请求的响应消息中包含所述 P-CSCF仅支持紧急业务 的信息或 UE不能进行 IMS正常业务的信息。 进一步地,所述 P-GW还设置成在向 UE返回所述 P-CSCF的 IP地址时, 向 UE返回所述 P-CSCF仅支持紧急业务的指示信息。 进一步地, 该系统还包含: SGSN及 GGSN, 此时, 该系统适用于 SAE 网络, 其中:
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过所述
SGSN向 UE返回所述 P-CSCF的 IP地址,并将所述 P-CSCF设置为使用上述 GPRS紧急 PDP上下文发起的 IMS业务请求的唯一目的 P-CSCF;
所述 GGSN还设置成为 UE建立 GPRS紧急 PDP上下文,之后通过 SGSN 向 UE返回运营商规划的仅用于紧急业务的 IP地址;
所述 P-CSCF还设置成由运营商预配置了仅用于紧急业务的 IP地址; 还 设置成拒绝在紧急连接上收到的非紧急目的的注册请求;
其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 GGSN向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。 进一步地, 所述 GGSN还设置成在接收到 UE使用所述 GPRS紧急 PDP 上下文发起的 IMS业务请求后, 判断所述 IMS业务请求的目的 P-CSCF是否 为所述 P-CSCF, 如果是则将所述 IMS业务请求转发给所述 P-CSCF; 否则不 转发所述 IMS业务请求。
进一步地, 所述 GGSN还设置成当 UE使用所述 GPRS紧急 PDP上下文 发起 IMS业务请求时, 向所述 P-CSCF转发所述 IMS业务请求;
所述 P-CSCF还设置成在接收到所述 GGSN转发的所述 IMS业务请求后 , 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请 求。
进一步地, 所述 P-CSCF还设置成釆用如下方式拒绝所述 IMS正常业务 清求:
所述 P-CSCF向 UE返回拒绝所述 IMS正常业务请求的响应消息, 并在 拒绝所述 IMS正常业务请求的响应消息中包含所述 P-CSCF仅支持紧急业务 的信息或 UE不能进行 IMS正常业务的信息。 进一步地,所述 GGSN还设置成在向 UE返回所述 P-CSCF的 IP地址时, 向 UE返回所述 P-CSCF仅支持紧急业务的指示信息。 本发明还提供了一种 P-GW, 其中,
所述 P-GW设置成为 UE建立紧急承载 ,之后通过 MME向 UE返回仅支 持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求; 或者
所述 P-GW设置成为 UE建立紧急承载,之后通过 MME向 UE返回运营 商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置了仅用于紧急业 务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。 本发明还提供了一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 P-GW 为 UE 所建立的紧急承载发起的 IMS 业务请求的唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请 求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 P-GW通过 MME向 UE返回 的运营商规划的仅用于紧急业务的 IP地址一致。 本发明还提供了一种 GGSN, 其中,
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回仅支持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述 GPRS紧急 PDP上下文发起的 IMS业 务清求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到 的非紧急目的的注册请求; 或者
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回运营商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置 了仅用于紧急业务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急 目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急 业务的 IP地址与所述 GGSN向 UE返回的运营商规划的仅用于紧急业务的 IP 地址一致。 本发明还提供了一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 GGSN为 UE所建立的 GPRS紧急 PDP上下文发起的 IMS业务请求的 唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的 的注册请求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 GGSN通过 SGSN向 UE返 回的运营商规划的仅用于紧急业务的 IP地址一致。
综上所述, 本发明通过在 IMS 网络侧设置仅支持 IMS 紧急业务的紧急 P-CSCF, 并在 P-GW将该紧急 P-CSCF设置为采用紧急默认承载发起的 IMS 业务请求的唯一目的 P-CSCF,有效地防止了 UE使用紧急承载发起 IMS正常 业务的注册, 进而防止了 UE使用紧急承载进行 IMS正常业务。 附图概述
图 1描述了 UE通过 SAE接入 IMS的紧急呼叫所涉及的主要网元; 图 2描述了现有技术中签约正常且接入不受限的 UE向 SAE发起紧急承 载的建立, 并在 IMS中发起正常注册的流程;
图 3是本发明第一实施例中 IMS业务的建立方法总体流程图; 图 4是本发明第一实施例中 IMS业务的建立方法流程图之一; 图 5是本发明第一实施例中 IMS业务的建立方法流程图之二; 图 6是本发明第一实施例中 IMS业务的建立方法流程图之三; 图 7是本发明第一实施例中 IMS业务建立系统的结构示意图; 图 8是 UE (或称 MS )通过 GPRS接入 IMS的紧急呼叫所涉及的主要网 元;
图 9是本发明第二实施例中 IMS业务的建立方法流程图之一; 图 10是本发明第二实施例中 IMS业务的建立方法流程图之二
图 11是本发明第二实施例中 IMS业务的建立方法流程图之三。 本发明的较佳实施方式
下面将结合附图和实施例对本发明进行详细描述。
图 3是本发明 IMS业务的建立方法流程图之一;图 3描述了 UE建立 SAE 紧急承载(或称为 SAE紧急业务), 并使用该紧急承载发起 IMS紧急业务的 流程, 具体包括如下步骤:
步骤 301, UE向 MME发起紧急承载建立请求, 上述请求中携带紧急标 识; 上述紧急标识可以是紧急 APN;
这里, 紧急承载建立请求为紧急附着请求或紧急 PDN连接建立请求。 其中, 当 UE发起紧急 PDN连接建立请求时, UE已经正常附着到 SAE 网络, 并且有正常的 PDN连接。
步骤 302, MME通过域名系统解析出紧急标识对应的 P-GW、 或根据本 地配置选择一个支持紧急业务的 P-GW, 并向该 P-GW发起建立默认承载请 求, 以建立紧急承载 (即建立紧急 PDN连接的紧急默认承载) ;
步骤 303, P-GW收到建立默认承载请求后, 向 MME返回建立默认承载 响应; 在上述建立默认承载响应中携带 P-CSCF的 IP地址以及上述紧急承载 所对应的 (或者说上述紧急 PDN连接所对应的) UE的 IP地址; 并且 P-GW 设置为使用该紧急 PDN连接的紧急默认承载(可以是使用紧急承载 /紧急 PDN 连接所对应的 IP地址和默认承载的承载标识)发送的数据包只能路由到上述 P-CSCF, 也就是说将上述 P-CSCF设置为使用该紧急承载 (即紧急 PDN连接 的紧急默认承载 )对应的 IP地址发送的数据包的唯一目的 P-CSCF;
此外, 该响应中还可以携带该 P-CSCF只能用于 IMS紧急业务的指示信 息(简称紧急 P-CSCF指示),该指示信息用于通知 UE使用且仅使用该 P-CSCF 发起 IMS紧急业务。
本发明中的上述 P-CSCF是专用于 IMS紧急业务的 P-CSCF,可以称为紧 急 P-CSCF。
需要注意的是, 本发明中 P-GW设置的对 UE的 IMS业务请求的路由限 制(即仅能路由到紧急 P-CSCF )仅针对紧急默认承载, 对紧急专有承载没有 上述路由限制。
步骤 304 , MME收到 P-GW发送的建立默认承载响应后, 向 UE回复紧 急附着响应或紧急 PDN连接建立响应,其中携带上述 P-CSCF的 IP地址以及 上述紧急承载所对应的(或者说上述紧急 PDN连接所对应的)UE的 IP地址; 此外, 紧急附着响应或紧急 PDN连接建立响应中还可以携带上述紧急
P-CSCF指示。
步骤 305, UE收到紧急附着响应或者紧急 PDN建立响应后, 使用其中 携带的 UE的 IP地址(紧急承载 /紧急 PDN连接所对应的 IP地址) 、 在紧急 PDN连接的紧急默认承载中、 通过 P-GW向紧急 P-CSCF发起 IMS紧急业务 的注册请求;
P-GW 接收到上述 IMS 紧急业务的注册请求后, 判断该请求的目的 P-CSCF是否为紧急 P-CSCF (即判断是否是发送给紧急 P-CSCF的请求 ) , 如果是, 则 P-GW向紧急 P-CSCF转发该注册请求; 本实施例中, 由于该请 求的目的 P-CSCF是紧急 P-CSCF, 因此不会丢弃该请求。
此外, 由于紧急 P-CSCF是仅设置成支持紧急业务的 P-CSCF, 所以紧急
P-CSCF也接受该注册请求, 并完成后续的 IMS注册流程。
步骤 306, 完成 IMS紧急业务的注册之后, UE可以与 PSAP进行 IMS 紧急呼叫。 图 4是本发明 IMS业务的建立方法流程图之二;图 4描述了 UE建立 SAE 紧急承载 (或称为 SAE紧急业务) , 并使用该紧急承载向非紧急 P-CSCF发 起 IMS业务请求被丟弃的流程, 具体包括如下步骤:
步骤 401 ~ 404, 与步骤 301 ~ 304相同, 在此不再赘述;
步骤 405, UE收到紧急附着响应或者紧急 PDN建立响应后, 使用其中 携带的 UE的 IP地址(紧急承载 /紧急 PDN连接所对应的 IP地址) 、 在紧急 PDN连接的紧急默认承载中、 通过 P-GW向非紧急 P-CSCF发起 IMS业务请 求; 由于 P-GW设置为使用该紧急 PDN连接的紧急默认承载(可以是使用紧 急承载 /紧急 PDN连接所对应的 IP地址和默认承载的承载标识)发送的数据 包只能路由到紧急 P-CSCF, 所以 P-GW不转发(可以直接丢弃) 该 IMS业 务请求数据包。
图 5是本发明 IMS业务的建立方法流程图之三;图 5描述了 UE建立 SAE 紧急承载 (或称为 SAE紧急业务) , 并使用该紧急承载向紧急 P-CSCF发起 IMS正常业务被拒绝的流程, 具体包括如下步骤:
步骤 501 ~ 504, 与步骤 301 ~ 304相同, 在此不再赘述;
步骤 505, UE收到紧急附着响应或者紧急 PDN建立响应后, 使用其中 携带的 UE的 IP地址(紧急承载 /紧急 PDN连接所对应的 IP地址) 、 在紧急 PDN连接的紧急默认承载中、 通过 P-GW向紧急 P-CSCF发起 IMS正常业务 的注册请求, 该请求被 P-GW发送给紧急 P-CSCF;
步骤 506, 紧急 P-CSCF收到上述注册请求后, 判定该注册请求为 IMS 正常业务的注册请求,而由于紧急 P-CSCF仅支持紧急业务,因此紧急 P-CSCF 拒绝该注册请求 (例如, 紧急 P-CSCF向 UE返回拒绝注册请求的响应消息, 该消息中可以携带拒绝原因, 即: 该 P-CSCF仅支持紧急业务, 或 UE不能进 行 IMS正常业务) 。
图 6是本发明提出的一种规划用于紧急业务的地址空间的方法, 以防止 UE使用紧急承载进行 IMS正常业务。 步骤 601 , 602与步骤 301 , 302相同;
步骤 603中, 与步骤 303不同的是 P-GW为 UE分配的地址为运营商规 划的仅用于紧急业务的 IP地址;
步骤 604, UE获取到上述 IP地址;
步骤 605, UE使用上述地址向 P-CSCF发起 IMS正常注册请求; 步骤 606, 由于运营商在 P-CSCF上预配置了规划仅用于紧急业务的 IP 地址(这里的配置与步骤 603中在 P-GW上的配置是相同的), P-CSCF分析 上述正常注册请求中的 UE IP地址, 认为该 IP地址仅能用于紧急业务, 收到 的所述正常注册请求非法, 拒绝该用户的 IMS正常注册请求。
其中 , 运营商在 P-CSCF上预配置的仅用于紧急业务的 IP地址与 P-GW 为 UE分配的运营商规划的仅用于紧急业务的 IP地址一致。
图 7是本发明的 IMS业务建立系统的结构示意图, 如图 7所示, 该系统 包含: MME、 P-GW和仅支持 IMS紧急业务的紧急 P-CSCF; 其中:
P-GW设置成为 UE建立紧急 PDN连接的紧急默认承载后, 通过 MME 向 UE返回紧急 P-CSCF的 IP地址以及上述紧急 PDN连接所对应的 IP地址, 并将紧急 P-CSCF设置为使用上述紧急 PDN连接的紧急默认承载发起的 IMS 业务请求数据包的唯一目的 P-CSCF。
P-GW在接收到 UE使用紧急默认承载发起的 IMS业务请求后, 判断该 IMS业务请求的目的 P-CSCF是否为紧急 P-CSCF,如果是则将该 IMS业务请 求转发给紧急 P-CSCF, 如果不是则不转发该 IMS业务请求。
紧急 P-CSCF在接收到 P-GW转发的 IMS业务请求后, 判断该业务请求 是否为 IMS正常业务请求, 如果是, 则拒绝该请求。
紧急 P-CSCF可以采用如下方式拒绝 IMS正常业务请求: 紧急 P-CSCF 向 UE 返回拒绝 IMS 正常业务请求的响应消息, 并在该消息中包含紧急 P-CSCF仅支持紧急业务或者不能进行 IMS正常业务的信息。
此外, P-GW在向 UE返回紧急 P-CSCF的 IP地址以及紧急承载所对应 的 IP地址时, 还可以向 UE返回该 P-CSCF仅支持紧急业务的指示信息。 此外, 所述 P-GW还设置成为 UE建立紧急承载, 之后通过 MME向 UE 返回运营商规划的仅用于紧急业务的 IP地址;
所述 P-CSCF还设置成由运营商预配置了仅用于紧急业务的 IP地址; 还 设置成拒绝在紧急连接上收到的非紧急目的的注册请求;
其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
另外, 在以上的描述中, 仅描述了本发明应用于 SAE网络的情况, 但是 本发明也同样适用于通用分组无线业务( GPRS, General Packet Radio Service ) 网络, 因为 GPRS网络也支持 IMS业务, 包括紧急业务, 同样存在现有技术 中提到的技术问题。
且 UE (或称 MS )通过 GPRS接入 IMS的紧急呼叫所涉及的主要网元如 图 8所示,在 GPRS网络中,服务通用分组无线业务支持节点( SGSN, Serving GPRS Support Node ) 的控制面功能与 MME类似, SGSN 的用户面功能和 S-GW类似; 网关通用分组无线业务支持节点( GGSN, Gateway GPRS Support Node ) 与 P-GW功能类似; UE也称为移动台 (MS, Mobile Station ) , 此时 MS与 GGSN之间建立的是分组数据协议 ( PDP, Packet Data Protocol ) 上下 文,在 MS使用 IMS紧急业务时, 称为紧急 PDP上下文(也称为紧急连接 ) , 依此可以清楚本发明用于 GPRS网络时的具体操作流程。
图 9 , 10 , 11即是 GPRS接入 IMS的流程 ,分别与 SAE接入 IMS的图 4 ,
5 , 7相应, 接入的流程有所不同, 但 本思想相同。
图 9描述了 UE建立 GPRS紧急 PDP上下文, 并使用该紧急 PDP上下文 向非紧急 P-CSCF发起 IMS业务请求被丟弃的流程, 具体包括如下步骤: 步骤 901 , UE向 SGSN发起紧急 PDP上下文建立请求,上述请求中携带 紧急标识; 上述紧急标识可以是紧急 APN;
步骤 902, SGSN通过域名系统解析出紧急标识对应的 GGSN、 或根据本 地配置选择一个支持紧急业务的 GGSN,并向该 GGSN发起建立 PDP上下文 请求, 以建立紧急 PDP上下文; 步骤 903 , GGSN收到建立上述请求后, 向 SGSN返回建立 PDP上下文 响应;在上述建立响应中携带 P-CSCF的 IP地址以及上述紧急 PDP上下文所 对应的 UE的 IP地址;并且 GGSN设置为使用该紧急 PDP上下文发送的数据 包只能路由到上述 P-CSCF,也就是说将上述 P-CSCF设置为使用该紧急 PDP 上下文对应的 IP地址发送的数据包的唯一目的 P-CSCF;
此外, 该响应中还可以携带该 P-CSCF只能用于 IMS紧急业务的指示信 息(简称紧急 P-CSCF指示),该指示信息用于通知 UE使用且仅使用该 P-CSCF 发起 IMS紧急业务。
本发明中的上述 P-CSCF是专用于 IMS紧急业务的 P-CSCF,可以称为紧 急 P-CSCF。
步骤 904, SGSN收到 GGSN发送的建立 PDP上下文响应后, 向 UE回 复 PDP上下文建立响应,其中携带上述 P-CSCF的 IP地址以及上述紧急 PDP 上下文所对应的 UE的 IP地址;
此外, 紧急 PDP建立响应中还可以携带上述紧急 P-CSCF指示。
步骤 905, UE收到紧急 PDP上下文建立响应后, 使用其中携带的 UE的
IP地址、在紧急 PDP上下文中、通过 GGSN向非紧急 P-CSCF发起 IMS业务 请求; 由于 GGSN设置为使用该紧急 PDP上下文发送的数据包只能路由到紧 急 P-CSCF, 所以 GGSN不转发 (可以直接丟弃 )该 IMS业务请求数据包。
图 10描述了 UE建立 GPRS紧急 PDP上下文, 并使用该紧急 PDP上下 文向紧急 P-CSCF发起 IMS正常业务被拒绝的流程, 具体包括如下步骤: 步骤 1001 ~ 1004, 与步骤 901 ~ 904相同, 在此不再赘述;
步骤 1005 , UE收到紧急 PDP上下文建立响应后, 使用其中携带的 UE 的 IP地址、 在紧急 PDP上下文中、 通过 GGSN向紧急 P-CSCF发起 IMS正 常业务的注册请求 , 该请求被 GGSN发送给紧急 P-CSCF;
步骤 1006, 紧急 P-CSCF收到上述注册请求后, 判定该注册请求为 IMS 正常业务的注册请求,而由于紧急 P-CSCF仅支持紧急业务,因此紧急 P-CSCF 拒绝该注册请求 (例如, 紧急 P-CSCF向 UE返回拒绝注册请求的响应消息, 该消息中可以携带拒绝原因, 即: 该 P-CSCF仅支持紧急业务, 或 UE不能进 行 IMS正常业务) 。
图 11是本发明提出的一种规划用于紧急业务的地址空间的方法,以防止 UE使用紧急 PDP上下文进行 IMS正常业务。
步骤 1101 , 1102与步骤 901 , 902相同;
步骤 1103中,与步骤 903不同的是 GGSN为 UE分配的地址为运营商规 划的仅用于紧急业务的 IP地址;
步骤 1104 , UE获取到上述 IP地址;
步骤 1105, UE使用上述地址向 P-CSCF发起 IMS正常注册请求; 步骤 1106, 由于运营商在 P-CSCF上预配置了规划仅用于紧急业务的 IP 地址(这里的配置与步骤 1103中在 GGSN上的配置是相同的) , P-CSCF 分析上述正常注册请求中的 UE IP地址, 认为该 IP地址仅能用于紧急业 务, 收到的所述正常注册请求非法, 拒绝该用户的 IMS正常注册请求。
另外, 本发明适用于 GPRS网络时, 相应的系统与上述图 9-图 11描述的 方法对应, 在此不再赘述。
另外, 本发明还提供了一种 P-GW, 其中,
所述 P-GW设置成为 UE建立紧急承载,之后通过 MME向 UE返回仅支 持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求; 或者
所述 P-GW设置成为 UE建立紧急承载,之后通过 MME向 UE返回运营 商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置了仅用于紧急业 务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
本发明还提供了一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 P-GW 为 UE 所建立的紧急承载发起的 IMS 业务请求的唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请 求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 P-GW通过 MME向 UE返回 的运营商规划的仅用于紧急业务的 IP地址一致。
本发明还提供了一种 GGSN, 其中,
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回仅支持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述 GPRS紧急 PDP上下文发起的 IMS业 务请求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到 的非紧急目的的注册请求; 或者
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回运营商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置 了仅用于紧急业务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急 目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急 业务的 IP地址与所述 GGSN向 UE返回的运营商规划的仅用于紧急业务的 IP 地址一致。
本发明还提供了一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 GGSN为 UE所建立的 GPRS紧急 PDP上下文发起的 IMS业务请求的 唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的 的注册请求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 GGSN通过 SGSN向 UE返 回的运营商规划的仅用于紧急业务的 IP地址一致。
此外,以上提到的所有的紧急 P-CSCF还可以是普通 P-CSCF上的一个特 殊接口对应的逻辑模块, 也即所述普通 P-CSCF包含紧急 P-CSCF功能。
综上所述, 本发明通过设置仅支持 IMS 紧急业务的紧急 P-CSCF, 并在 P-GW将该紧急 P-CSCF设置为采用紧急默认承载发起的 IMS业务请求的唯 一目的 P-CSCF,实现了防止 UE使用紧急默认承载发起 IMS正常业务的注册, 进而防止 UE使用紧急承载进行 IMS正常业务的作用。
以上所述仅为本发明的较佳实施例而已, 并非用于限定本发明, 本领域 技术人员根据本发明所作的任何修饰和变更, 均在本发明的保护范围内。
工业实用性
本发明通过在 IMS网络侧设置仅支持 IMS紧急业务的紧急 P-CSCF, 并 在 P-GW将该紧急 P-CSCF设置为采用紧急默认承载发起的 IMS业务请求的 唯一目的 P-CSCF,有效地防止了 UE使用紧急承载发起 IMS正常业务的注册, 进而防止了 UE使用紧急承载进行 IMS正常业务, 因此具有很强的工业实用 性。

Claims

权 利 要 求 书
1、 一种 IP多媒体子系统 IMS业务的建立方法, 该方法包括:
P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求。
2、 如权利要求 1所述的方法, 其中, 所述方法适用于系统架构演进 SAE 网络和通用无线分组业务 GPRS网络。
3、 如权利要求 2所述的方法, 其中, 当所述方法适用于 SAE网络时, 所述紧急连接为 SAE的紧急分组数据网 PDN连接;
当所述方法适用于 GPRS网络时, 所述紧急连接为 GPRS的紧急分组数 据协议 PDP上下文。
4、 如权利要求 2或 3所述的方法, 其中, 当所述方法适用于 SAE网络 时, P-CSCF 拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包 括:
A、 分组数据网网关 P-GW为用户设备 UE建立紧急承载后, 执行步骤 B 或者步骤 Β';
Β、 所述 P-GW通过移动性管理实体 MME向 UE返回仅支持 IP多媒体 子系统 IMS紧急业务的第一代理呼叫会话控制功能 P-CSCF的 IP地址, 并将 所述第一 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF,所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求;
B'、所述 P-GW通过 MME向 UE返回运营商规划的仅用于紧急业务的 IP 地址, 由运营商预配置了仅用于紧急业务的 IP地址的第二 P-CSCF拒绝在紧 急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF 上预配置的仅用于紧急业务的 IP地址与 P-GW向 UE返回的运营商规划的仅 用于紧急业务的 IP地址一致;
当所述方法适用于 GPRS网络时, P-CSCF拒绝在紧急连接上收到的非紧 急目的的注册请求的所述步骤包括:
D、 网关通用分组无线业务支持节点 GGSN为用户设备 UE建立 GPRS 紧急 PDP上下文后 , 执行步骤 B或者步骤 Β'; E、所述 GGSN通过服务通用分组无线业务支持节点 SGSN向 UE返回仅 支持 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为 使用上述 GPRS紧急 PDP上下文发起的 IMS业务请求的唯一目的 P-CSCF, 所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求;
E'、 所述 GGSN通过 SGSN向 UE返回运营商规划的仅用于紧急业务的
IP地址, 由运营商预配置了仅用于紧急业务的 IP地址的第二 P-CSCF拒绝在 紧急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF 上预配置的仅用于紧急业务的 IP地址与 GGSN向 UE返回的运营商规划的仅 用于紧急业务的 IP地址一致。
5、 如权利要求 4所述的方法, 其中, 当所述方法适用于 SAE网络时, 所述紧急承载为紧急分组数据网 PDN连接的紧急默认承载。
6、 如权利要求 4所述的方法, 其中, 当所述方法适用于 SAE网络时, 所述第一 P-CSCF或所述第二 P-CSCF拒绝在紧急连接上收到的非紧急目的的 注册请求的所述步骤包括步骤 C:
C、 UE使用所述紧急承载发起 IMS业务请求, 所述 P-GW收到所述 IMS 业务请求后,判断所述 IMS业务请求的目的 P-CSCF是否为所述第一 P-CSCF 或所述第二 P-CSCF, 如果是则将所述 IMS业务清求转发给所述第一 P-CSCF 或所述第二 P-CSCF; 否则不转发所述 IMS业务请求;
当所述方法适用于 GPRS网络时, 所述第一 P-CSCF或所述第二 P-CSCF 拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包括步骤 F:
F、 UE使用所述 GPRS紧急 PDP上下文发起 IMS业务请求, 所述 GGSN 收到所述 IMS业务请求后, 判断所述 IMS业务请求的目的 P-CSCF是否为所 述第一 P-CSCF或所述第二 P-CSCF,如果是则将所述 IMS业务请求转发给所 述第一 P-CSCF或所述第二 P-CSCF; 否则不转发所述 IMS业务 ϊ會求。
7、 如权利要求 4所述的方法, 其中, 当所述方法适用于 SAE网络时, 所述第一 P-CSCF或所述第二 P-CSCF拒绝在紧急连接上收到的非紧急目的的 注册请求的所述步骤包括步骤 C':
C'、 UE使用所述紧急承载发起 IMS业务请求, 通过所述 P-GW向所述 第一 P-CSCF或所述第二 P-CSCF转发所述 IMS业务请求, 所述第一 P-CSCF 或所述第二 P-CSCF接收到所述 P-GW转发的所述 IMS业务请求后, 确定所 述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请求; 当所述方法适用于 GPRS网络时, 所述第一 P-CSCF或所述第二 P-CSCF 拒绝在紧急连接上收到的非紧急目的的注册请求的所述步骤包括步骤 F:
F、 UE使用所述 GPRS紧急 PDP上下文发起 IMS业务请求, 通过所述 GGSN向所述第一 P-CSCF或所述第二 P-CSCF转发所述 IMS业务请求, 所 述第一 P-CSCF或所述第二 P-CSCF接收到所述 GGSN转发的所述 IMS业务 请求后, 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正 常业务请求。
8、如权利要求 7所述的方法,其中 ,所述步骤 C '和 F中 ,所述第一 P-CSCF 或所述第二 P-CSCF釆用如下方式拒绝所述 IMS正常业务请求:
所述第一 P-CSCF或所述第二 P-CSCF向 UE返回拒绝所述 IMS正常业务 请求的响应消息, 并在拒绝所述 IMS正常业务请求的响应消息中包含所述第 一 P-CSCF或所述第二 P-CSCF仅支持紧急业务的信息或 UE不能进行 IMS 正常业务的信息。
9、 如权利要求 4所述的方法, 其中,
当所述方法适用于 SAE网络时,所述 P-GW向 UE返回所述第一 P-CSCF 或所述第二 P-CSCF的 IP地址时, 还向 UE返回所述第一 P-CSCF或所述第 二 P-CSCF仅支持紧急业务的指示信息;
当所述方法适用于 GPRS 网络时, 所述 GGSN 向 UE返回所述第一 P-CSCF或所述第二 P-CSCF的 IP地址时, 还向 UE返回所述第一 P-CSCF或 所述第二 P-CSCF仅支持紧急业务的指示信息。
10、 一种 IMS业务的建立系统, 该系统包括: P-CSCF, 其设置成拒绝在 紧急连接上收到的非紧急目的的注册请求。
11、 如权利要求 10所述的系统, 其中, 该系统还包含: MME及 P-GW, 此时, 该系统适用于 SAE网络, 其中: 所述 P-GW设置成为 UE建立紧急承载,之后通过所述 MME向 UE返回 所述 P-CSCF的 IP地址, 并将所述 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF;
所述 P-GW还设置成为 UE建立紧急承载,之后通过 MME向 UE返回运 营商规划的仅用于紧急业务的 IP地址;
所述 P-CSCF还设置成由运营商预配置了仅用于紧急业务的 IP地址; 还 设置成拒绝在紧急连接上收到的非紧急目的的注册请求;
其中 , 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
12、 如权利要求 11所述的系统, 其中, 所述紧急承载为紧急分组数据网
PDN连接的紧急默认承载。
13、 如权利要求 11或 12所述的系统, 其中,
所述 P-GW还设置成在接收到 UE使用所述紧急承载发起的 IMS业务请 求后, 判断所述 IMS业务请求的目的 P-CSCF是否为所述 P-CSCF, 如果是则 将所述 IMS业务请求转发给所述 P-CSCF; 否则不转发所述 IMS业务请求。
14、 如权利要求 11或 12所述的系统, 其中,
所述 P-GW还设置成当 UE使用所述紧急承载发起 IMS业务请求时, 向 所述 P-CSCF转发所述 IMS业务请求;
所述 P-CSCF还设置成在接收到所述 P-GW转发的所述 IMS业务倚求后, 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请 求。
15、 如权利要求 14所述的系统, 其中, 所述 P-CSCF还设置成采用如下 方式拒绝所述 IMS正常业务请求:
所述 P-CSCF向 UE返回拒绝所述 IMS正常业务请求的响应消息, 并在 拒绝所述 IMS正常业务请求的响应消息中包含所述 P-CSCF仅支持紧急业务 的信息或 UE不能进行 IMS正常业务的信息。
16、 如权利要求 11所述的系统, 其中, 所述 P-GW还设置成在向 UE返回所述 P-CSCF的 IP地址时, 向 UE返 回所述 P-CSCF仅支持紧急业务的指示信息。
17、 如权利要求 10所述的系统, 其中, 该系统还包含: SGSN及 GGSN, 此时, 该系统适用于 SAE网络, 其中:
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过所述
SGSN向 UE返回所述 P-CSCF的 IP地址,并将所述 P-CSCF设置为使用上述 GPRS紧急 PDP上下文发起的 IMS业务请求的唯一目的 P-CSCF;
所述 GGSN还设置成为 UE建立 GPRS紧急 PDP上下文,之后通过 SGSN 向 UE返回运营商规划的仅用于紧急业务的 IP地址;
所述 P-CSCF还设置成由运营商预配置了仅用于紧急业务的 IP地址; 还 设置成拒绝在紧急连接上收到的非紧急目的的注册请求;
其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 GGSN向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
18、 如权利要求 17所述的系统, 其中,
所述 GGSN还设置成在接收到 UE使用所述 GPRS紧急 PDP上下文发起 的 IMS 业务请求后, 判断所述 IMS 业务请求的目的 P-CSCF 是否为所述 P-CSCF , 如果是则将所述 IMS业务请求转发给所述 P-CSCF; 否则不转发所 述 IMS业务请求。
19、 如权利要求 17所述的系统, 其中,
所述 GGSN还设置成当 UE使用所述 GPRS紧急 PDP上下文发起 IMS业 务请求时, 向所述 P-CSCF转发所述 IMS业务请求;
所述 P-CSCF还设置成在接收到所述 GGSN转发的所述 IMS业务请求后, 确定所述 IMS业务请求是 IMS正常业务请求后, 拒绝所述 IMS正常业务请 求。
20、 如权利要求 19所述的系统, 其中, 所述 P-CSCF还设置成釆用如下 方式拒绝所述 IMS正常业务请求:
所述 P-CSCF向 UE返回拒绝所述 IMS正常业务请求的响应消息, 并在 拒绝所述 IMS正常业务请求的响应消息中包含所述 P-CSCF仅支持紧急业务 的信息或 UE不能进行 IMS正常业务的信息。
21、 如权利要求 10所述的系统, 其中,
所述 GGSN还设置成在向 UE返回所述 P-CSCF的 IP地址时, 向 UE返 回所述 P-CSCF仅支持紧急业务的指示信息。
22、 一种 P-GW, 其中,
所述 P-GW设置成为 UE建立紧急承载,之后通过 MME向 UE返回仅支 持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述紧急承载发起的 IMS业务请求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求; 或者
所述 P-GW设置成为 UE建立紧急承载,之后通过 MME向 UE返回运营 商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置了仅用于紧急业 务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急业务的 IP地址与所 述 P-GW向 UE返回的运营商规划的仅用于紧急业务的 IP地址一致。
23、 一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 P-GW 为 UE 所建立的紧急承载发起的 IMS 业务请求的唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的的注册请 求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 P-GW通过 MME向 UE返回 的运营商规划的仅用于紧急业务的 IP地址一致。
24、 一种 GGSN, 其中,
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回仅支持 IP多媒体子系统 IMS紧急业务的第一 P-CSCF的 IP地址, 并将所述第一 P-CSCF设置为使用上述 GPRS紧急 PDP上下文发起的 IMS业 务请求的唯一目的 P-CSCF, 以使得所述第一 P-CSCF拒绝在紧急连接上收到 的非紧急目的的注册请求; 或者
所述 GGSN设置成为 UE建立 GPRS紧急 PDP上下文, 之后通过 SGSN 向 UE返回运营商规划的仅用于紧急业务的 IP地址, 以使得由运营商预配置 了仅用于紧急业务的 IP地址得第二 P-CSCF拒绝在紧急连接上收到的非紧急 目的的注册请求, 其中, 运营商在所述第二 P-CSCF上预配置的仅用于紧急 业务的 IP地址与所述 GGSN向 UE返回的运营商规划的仅用于紧急业务的 IP 地址一致。
25、 一种 P-CSCF, 其中:
所述 P-CSCF设置成仅支持 IP多媒体子系统 IMS紧急业务,所述 P-CSCF 为使用 GGSN为 UE所建立的 GPRS紧急 PDP上下文发起的 IMS业务请求的 唯一目的 P-CSCF, 以使得所述 P-CSCF拒绝在紧急连接上收到的非紧急目的 的注册请求; 或者
所述 P-CSCF设置成由运营商预配置了仅用于紧急业务的 IP地址; 还设 置成拒绝在紧急连接上收到的非紧急目的的注册请求; 其中, 运营商在所述 P-CSCF上预配置的仅用于紧急业务的 IP地址与 GGSN通过 SGSN向 UE返 回的运营商规划的仅用于紧急业务的 IP地址一致。
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