WO2011054252A1 - 一种空闲态信令减少条件下的终呼实现方法和系统 - Google Patents

一种空闲态信令减少条件下的终呼实现方法和系统 Download PDF

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Publication number
WO2011054252A1
WO2011054252A1 PCT/CN2010/077943 CN2010077943W WO2011054252A1 WO 2011054252 A1 WO2011054252 A1 WO 2011054252A1 CN 2010077943 W CN2010077943 W CN 2010077943W WO 2011054252 A1 WO2011054252 A1 WO 2011054252A1
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Prior art keywords
isr
user terminal
application server
identifier
call
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PCT/CN2010/077943
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English (en)
French (fr)
Inventor
谢振华
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中兴通讯股份有限公司
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Publication of WO2011054252A1 publication Critical patent/WO2011054252A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12Inter-network notification

Definitions

  • the present invention relates to the field of communications, and more particularly to a method and system for implementing a terminal call in an idle state signaling reduction condition in an IP multimedia subsystem.
  • IP Multimedia Subsystem is an IP-based network architecture IMS proposed by the 3rd Generation Partnership Project (3GPP).
  • 3GPP 3rd Generation Partnership Project
  • the control layer does not provide specific services, and only provides necessary triggering, routing, and accounting functions to the service layer.
  • the service triggering and control functions in the control layer are completed by the Call Session Control Function (CSCF).
  • CSCF Call Session Control Function
  • the CSCF is divided into three types: proxy (Proxy), query (Interrogating), and service (Serving). It is Serving, and the Interrogating type is optional.
  • the service layer is composed of a series of application servers (ASs), which can provide specific service services.
  • ASs application servers
  • the AS can be an independent entity or a service CSCF (Serving-CSCF, S-CSCF for short).
  • the control layer S-CSCF controls the service trigger according to the subscription information of the user, and invokes the service on the AS to implement the service function.
  • the end-to-end device in the session is called User Equipment (UE) and is responsible for interaction with the user.
  • the mobile user equipment can access the IMS network through the Packet Switching (PS) domain of the 2G/3G network, or access the IMS network through the Long Term Evolution (LTE) network.
  • PS Packet Switching
  • LTE Long Term Evolution
  • the Circuit Switching (CS) domain of the 2G/3G network can be used to implement the conversion between the CS domain signaling and the IMS network signaling by interacting with the Media Gateway Control Function (MGCF) of the IMS network.
  • MGCF Media Gateway Control Function
  • the IMS network can also provide services for terminals accessing the CS domain.
  • the user terminal may decide to access the LTE network or the PS domain of the 2G/3G network according to the situation or CS domain.
  • the PS domain of a 2G/3G network cannot provide voice communication capabilities, and mainly provides data downloading capabilities.
  • the Idle Signalling Reduction (ISR) function is such that, in the above case, there is no signaling interaction between the access network and the home network, and the signaling interaction between the terminal and the access network is also kept to a minimum.
  • An area having an ISR function may be referred to as an ISR area.
  • 1 is a schematic diagram of a network architecture when a terminal UE-A is under the common coverage of an LTE network and a 2G/3G network, and describes that UE-A is under common coverage of an LTE network and a 2G/3G network, where UE-B is an IMS terminal.
  • the channel in the figure is described as follows: Channel 101, UE-A and the CS domain interaction signaling channel of the 2G/3G network, when the UE-A accesses the CS domain of the 2G/3G network, the CS signaling is exchanged with the MSC through the channel;
  • the channel 102, the MSC and the switching gateway MGCF of the IMS network exchange the CS signaling channel;
  • the channel 103, the MGCF and the CSCF of the IMS network exchange the IMS signaling channel, and the MGCF is responsible for realizing the mutual conversion between the CS signaling and the IMS signaling; 104.
  • the channel of the IMS signaling is exchanged between the UE-A and the CSCF of the IMS network, and the channel message is transmitted through the PS domain of the 2G/3G network or the LTE network; and the IMS is exchanged between the channel 105, the CSCF, and the application server (AS).
  • Channel for signaling; channel 106, CSCF and IMS terminal UE-B exchange IMS signaling channel;
  • UE-A and network do not start ISR function UE-A determines which network to access according to signal strength, and executes Attachment operation. After the attach operation is completed, the registration operation of the IMS network is performed, thereby using the service of the IMS network to notify the IMS network access network of the change in the registration operation.
  • the ISR function is a process in which the UE-B calls the UE-A. The process is as follows: Step 201: The UE-A accesses the LTE network and registers with the CSCF through the CSCF.
  • the CSCF registers the UE-A with the AS through the third-party registration.
  • the UE-A moves from the LTE network to the common coverage area of the LTE network and the 2G/3G network in the idle state, and the LTE network instructs the UE-A to start the ISR function, so the area is no longer initiated by the change of the access network.
  • Step 202 The UE-A accesses the 2G/3G network according to the change of the signal strength, but does not initiate the IMS registration;
  • Step 203 204 The UE-B initiates an IMS call to the UE-A, for example, an invitation to send the IMS signaling ( INVITE) message, the message target is the IMS domain identifier of the UE-A, and the message arrives at the AS via the P-CSCF and the S-CSCF (the S-CSCF and the P-CSCF both belong to the CSCF);
  • Step 205 the AS according to the UE-A Registration information, determining to initiate a call to UE-A through the PS domain;
  • Step 206 The AS forwards the IMS call message received in step 204, and indicates that the message is sent to the UE-A through the PS domain, for example, the route is specified to the P-CSCF in the INVITE message, and the message arrives at the P-CSCF via the S-CSCF.
  • Step 207 The P-CSCF sends a call message to the UE-A through the LTE network.
  • the UE-A receives the IMS call message and finds the PS of the 2G/3G network.
  • the domain does not support the voice communication;
  • Step 209 The UE-A returns the IMS reject call message, for example, sends the IMS "488 Not Acceptable here" message, the message passes through the PS domain of the 2G/3G network, and the LTE network arrives at the CSCF of the IMS network;
  • the CSCF forwards the reject call message to the AS;
  • Step 211, the AS decides to try to call the UE-A through the CS domain;
  • the AS forwards the IMS call message received in step 204, and sends an indication to the UE-A through the CS domain, for example, specifying a route to the MGCF in the INVITE message, and changing the call destination to the number of the UE-A, instead of the IMS.
  • IAM Initial Address Message
  • the UE After the UE-A responds to the paging, the UE sends an intra-office call message of the CS domain to the UE-A, for example, a SETUP message, and the target of the message is the number of the UE-A.
  • the message arrives at the UE-A.
  • Step 217 The CS domain of the 2G/3G network responds to the CS domain.
  • Interoffice calls such as Answer Message (ANM)
  • ANM Answer Message
  • the MGCF converts the ANM message of the CS domain into a response message of the IMS domain, for example, sends a "200 OK" message of the IMS, and the message arrives at the AS via the S-CSCF
  • Step 220 221 the AS forwards the response message to the UE -B, the message arrives at UE-B via S-CSCF and P-CSCF. So far, a communication connection is established between UE-A and UE-B.
  • the technical problem to be solved by the present invention is to provide a method and system for implementing a terminal call under an ISR condition, which effectively solves the problem of serially attempting different domains in the prior art, and avoids unnecessary Trying different domains guarantees high efficiency at the lowest cost.
  • the present invention provides a method for implementing a terminal call in an idle state signaling reduction condition, which is applied to an IP Multimedia Subsystem (IMS) network, and the method includes:
  • IMS IP Multimedia Subsystem
  • the application server of the IMS network When the application server of the IMS network receives the call to the user terminal, if the user terminal is in an idle state signaling reduction (ISR) area, the application server initiates a call to the user terminal simultaneously through the packet domain and the circuit domain. .
  • ISR idle state signaling reduction
  • the method further includes: determining, by the application server, that the user terminal is in the ISR area according to the ISR identifier of the user terminal;
  • the ISR identifier is obtained by the user terminal initiating the IMS registration to the application server when the user terminal enters the ISR region, and the registration message carries the ISR identifier, where the ISR identifier indicates that the user terminal enters the ISR region.
  • the method further includes: the application server determining, according to the ISR identifier of the user terminal, that the user terminal is in an ISR area; wherein the ISR identifier is obtained by: When the user terminal enters the ISR region, the Long Term Evolution (LTE) network device sends a message carrying the ISR identifier to the home subscriber server, where the ISR identifier indicates that the user terminal enters the ISR region; and the home subscriber server actively reports to the The application server sends the information of the user terminal, where the information of the user terminal carries the ISR identifier; or, when the home subscriber server receives the query of the application server, sends the information of the user terminal to the An application server, where the information of the user terminal carries the ISR identifier.
  • LTE Long Term Evolution
  • the method further includes: when the user terminal leaves the ISR area, the application server cancels the ISR identifier of the user terminal.
  • the method further includes: the application server from the packet domain or the circuit domain After receiving the response message, the domain forwards the response message and discards the reject call message received from another domain.
  • the present invention further provides a terminal call implementation system under the condition of idle state signaling reduction, which is applied to an IP Multimedia Subsystem (IMS) network, and the system includes a user terminal and an application server of an IMS network, where: The application server is configured to: when receiving a call to the user terminal, if the user terminal is in an idle state signaling reduction (ISR) area, initiate a call to the user terminal through the packet domain and the circuit domain at the same time.
  • IMS IP Multimedia Subsystem
  • the user terminal is configured to: initiate an IMS registration to the application server when entering the ISR area, and the registration message carries an ISR identifier, where the ISR identifier indicates that the user terminal enters an ISR area; the application server is further configured to: Determining, according to the ISR identifier, that the user terminal is in an ISR region.
  • the system further includes a Long Term Evolution (LTE) network device and a home subscriber server, where: the LTE network device is configured to: when the user terminal enters the ISR region, send a message carrying the ISR identifier to the home subscriber server, where the ISR The identifier indicates that the user terminal enters an ISR area; the home subscriber server is configured to: actively send information of the user terminal to the application server, where the information of the user terminal carries the ISR identifier; or, Sending the information of the user terminal to the application server, where the information of the user terminal carries the ISR identifier; the application server is further configured to: determine the user according to the ISR identifier The terminal is in the ISR area.
  • LTE Long Term Evolution
  • the application server is further configured to: when the user terminal leaves the ISR area, cancel the ISR identifier of the user terminal.
  • the application server is further configured to: receive a response cancellation from any of the packet domain or circuit domain After the message, the response message is forwarded, and the reject call message received from another domain is discarded.
  • the present invention further provides an application server, which is applied to an IP Multimedia Subsystem (IMS) network
  • the application server includes: a receiving module, configured to: receive a call to a user terminal; and a call initiation module, It is set as: When receiving a call to the user terminal, if the user terminal is in an idle state signaling reduction (ISR) area, a call to the user terminal is initiated simultaneously by the packet domain and the circuit domain.
  • the application server further includes a judging module.
  • the receiving module is further configured to: receive an IMS registration initiated by the user terminal when entering the ISR area, where the registration message carries an ISR identifier, where the ISR identifier indicates that the user terminal enters an ISR area.
  • the determining module is configured to: determine, according to the ISR identifier, that the user terminal is in an ISR region.
  • the application server further includes a judging module; the receiving module is further configured to: receive information of the user terminal that is actively sent by the home user server, where the information of the user terminal carries an ISR identifier; the ISR identifier is a user terminal When the ISR area is sent to the home subscriber server, the message is sent to the home subscriber server, and the application server further includes a query module.
  • the query module is configured to: query the home subscriber server.
  • the information of the user terminal is further configured to: when receiving the query that the home server receives the application server, send the information of the user terminal to the application server, where the information of the user terminal carries the ISR identifier
  • the ISR identifier is a message that is sent to the home subscriber server when the user terminal enters the ISR region, and carries an ISR identifier that is used to indicate that the user terminal enters the ISR region;
  • the determining module is configured to: determine, according to the ISR identifier, that the user terminal is in an ISR area.
  • the receiving module is further configured to: when the user terminal leaves the ISR area, cancel the ISR identifier of the user terminal.
  • the receiving module is further configured to: after receiving the response message from any of the domain in the packet domain or the circuit domain, forward the response message, and discard the reject call message received from another domain.
  • the method and system of the present invention in the case of ISR, performs PS domain and CS domain calls in parallel, shortening call setup time. The invention effectively solves the problem of serially trying different domains in the prior art, and at the same time avoids unnecessary attempts to different domains, and ensures high efficiency at the lowest cost.
  • FIG. 1 is a schematic diagram of a network architecture diagram when a terminal is in a common coverage of an LTE network and a 2G/3G network;
  • FIG. 2 is a flowchart of a terminal call of UE-A under the existing ISR condition;
  • FIG. 3 is an ISR of the present invention;
  • FIG. 4 is a terminal call flow chart 2 of UE-A under the ISR condition of the present invention;
  • FIG. 5 is a flow chart 3 of the terminal call of UE-A under the ISR condition of the present invention.
  • the method for implementing the terminal call in the idle signaling reduction condition provided by the present invention mainly includes:
  • the AS of the IMS network receives the call to the UE, if the UE is in the ISR area, the AS initiates a call to the UE simultaneously through the PS domain and the CS domain.
  • the method further includes: the AS determines, according to the ISR identifier of the UE, that the UE is in an ISR area, and the AS obtains an ISR identifier by: the UE initiates an IMS registration to the application server when entering the ISR area, in a registration message.
  • the UE sends the message carrying the ISR identifier to the Home Subscriber Server (HSS), and the ISR identifier indicates that the UE is in the ISR region.
  • HSS Home Subscriber Server
  • the HSS sends the information of the UE to the AS.
  • the information carries the ISR identifier.
  • the HSS receives the query from the AS, the HSS returns the information of the UE to the HSS.
  • the information carries the ISR identifier, and the AS stores the ISR identifier.
  • the IMS registration message without the ISR identifier is sent to cancel the ISR identifier in the AS.
  • the LTE network device sends a message without the ISR identifier to the HSS, thereby canceling the ISR identifier in the AS.
  • the AS initiates a call through the PS domain to forward the call to the P-CSCF.
  • the AS initiates a call through the CS domain to forward the call to the MGCF.
  • the AS forwards the response message and discards the reject call message received from another domain.
  • Step 3 is a terminal call flow diagram 1 of the UE-A under the ISR condition of the present invention, which describes that the UE-A is under the common coverage of the 2G/3G network and the LTE network in the idle state, and the UE-A and the network initiate the ISR function.
  • the process of the UE-B calling the UE-A is as follows: Step 301: The UE-A enters the ISR area. Step 302: The UE-A initiates the IMS registration, and the registration message carries the ISR identifier, and the registration message is carried by the LTE network.
  • Step 303 The registration message arrives at the CSCF, and the CSCF sends the registration message to the AS through the third-party registration process, so that the AS obtains the ISR identifier, and the AS saves the ISR identifier.
  • Step 307 The AS determines that the UE-A is in the ISR region according to the ISR identifier, and therefore decides to call the UE-A through the PS domain and the CS domain at the same time;
  • Step 308 312 is the same as steps 206-210 of FIG. 2; Steps 313-322, and Steps 212 to 221 of 2 are the same; wherein steps 308-312 and steps 313-322 are performed simultaneously, and there is no order relationship.
  • the UE-A if the UE-A leaves the ISR area, the UE-A sends an IMS registration message without the ISR identifier to cancel the ISR identifier in the AS.
  • Steps 401-403 are the same as steps 301-303 of FIG. 3; that is, when the UE-A enters the ISR area, it registers with the IMS network through the CSCF, and registers the message. Carrying the ISR identifier, the CSCF registers the UE-A in the AS through the third-party registration, so that the AS also obtains the ISR identifier.
  • Step 404 UE-A moves back and forth in the ISR region, and accesses the LTE network according to the signal strength. The ISR function does not have any message to the home network, and UE-A does not initiate an IMS registration message;
  • Steps 405-407 UE-B initiates an IMS call to UE-A, for example, an INVITE message for transmitting IMS signaling, the message destination is the IMS domain identifier of UE-A, and the message arrives at the AS via the P-CSCF and the S-CSCF;
  • the AS determines that the UE-A is in the ISR region according to the ISR identifier, and therefore decides to call the UE-A through the PS domain and the CS domain at the same time.
  • Step 408 The AS forwards the IMS call message received in step 406, and sends the message to the UE-A through the PS domain. For example, in the INVITE message, a route is specified to the P-CSCF, and the message passes through the S-CSCF to the P-CSCF.
  • Step 409 The P-CSCF sends a call message to the UE-A through the LTE network; Paging UE-A under LTE network, and also requiring PS domain of 2G/3G network to page UE-A together, so UE-A can always be found; UE-A accesses LTE network, so LTE network forwards IMS The message is sent to the UE-A.
  • Step 410 The UE-A receives the IMS call message, and finds that the LTE network supports the voice communication step 411, and the UE-A returns the IMS response call message, for example, sends the IMS "200 OK" message.
  • Step 412 the CSCF forwards the response call message to the AS
  • Step 413 414 the AS forwards the response message to the UE-B
  • the message arrives at the UE-B via the S-CSCF and the P-CSCF; 408 ⁇ 414 are performed in the following steps: Steps 415-417 are the same as steps 313-315 of FIG.
  • Step 418 UE-A is not available in the LTE network, 2G/3G CS domain; Step 419, 2G
  • the CS domain of the /3G returns an inter-office reject call message of the CS domain, such as a release release (RELEASE) message;
  • Step 420 the inter-office reject call message of the CS domain arrives at the MGCF, and the MGCF converts it into an IMS reject call message, such as sending "488 Not Acceptable here";
  • Step 421 the IMS rejects the call message to the CSCF, C
  • the SCF forwards it to the AS, and the AS does not forward the reject message to UE-B.
  • the UE-A if the UE-A leaves the ISR area, the UE-A sends an IMS registration message without the ISR identifier to cancel the ISR identifier in the AS.
  • an HSS is required, which is a network element of the IMS network.
  • this embodiment combines the AS and the CSCF into one entity, and the process between them is standardized.
  • 5 is a terminal call flow diagram 3 of the UE-A under the ISR condition of the present invention, which describes that the UE-A is under the common coverage of the 2G/3G network and the LTE network in the idle state, and the UE-A and the network start the ISR.
  • the process of UE-B calling UE-A is as follows: Step 501: The same as step 201 of FIG.
  • Step 502 The LTE network sends a notification message to the HSS, carrying an ISR indication, such as a mobility management entity of the LTE network ( Mobile Management Entity (abbreviated as ⁇ ) sends a notification message;
  • Step 503 UE-A accesses the 2G/3G network according to the change of the signal strength, but does not initiate IMS registration;
  • Step 504 UE-B initiates an IMS call to UE-A
  • an INVITE message is sent to the IMS, the message is the IMS domain identifier of the UE-A, and the message arrives at the AS via the CSCF.
  • Step 505 The application server AS interacts with the HSS to obtain information about the UE-A, thereby obtaining the UE.
  • the -A's ISR identity decides to initiate a call to the UE-A through the PS domain.
  • the AS can actively query the HSS for the information of the UE-A. After receiving the query from the AS, the HSS returns the information of the UE-A to the HSS, and the information carries The ISR identifier of the UE-A may also be used by the HSS to notify the AS of the information of the UE-A. The information carries the ISR identifier of the UE-A. Steps 506-515 are the same as steps 308-322 of FIG. 3; A communication connection is established between UE-A and UE-B. In this embodiment, if the UE-A leaves the ISR region, the LTE network device, such as the MME, sends a message without the ISR identifier to the HSS to cancel the ISR identifier in the AS.
  • the LTE network device such as the MME
  • the embodiment further provides a terminal call implementation system under the condition of idle state signaling reduction, which is applied to an IP Multimedia Subsystem (IMS) network, where the system includes a user terminal and an application server of the IMS network, where:
  • IMS IP Multimedia Subsystem
  • the application server is set to: When receiving a call to the user terminal, if the user terminal is in an idle state signaling reduction (ISR) area, the call to the user terminal is initiated simultaneously by the packet domain and the circuit domain.
  • the user terminal is configured to: initiate an IMS registration to the application server when entering the ISR region, and the registration message carries an ISR identifier, where the ISR identifier indicates that the user terminal enters the ISR region;
  • the application server is further configured to: determine that the user terminal is in the ISR area according to the ISR identifier.
  • the system further includes an LTE network device and a home subscriber server, where:
  • the LTE network device is configured to: when the user terminal enters the ISR region, send a message carrying the ISR identifier to the home subscriber server, where the ISR identifier indicates that the user terminal enters the ISR region; and the home subscriber server is configured to: actively send the user to the application server.
  • the information of the terminal, the information of the user terminal carries the ISR identifier; or, when receiving the query of the application server, sending the information of the user terminal to the application server, where the information of the user terminal carries the ISR identifier; the application server is further configured to : Determine the user terminal in the ISR area based on the ISR identifier.
  • the application server is further configured to: when the user terminal leaves the ISR area, cancel the ISR identifier of the user terminal.
  • the application server is further configured to: after receiving the response message from any domain in the packet domain or the circuit domain, forward the response message, and discard the reject call message received from another domain.
  • the embodiment further provides an application server, which is applied to an IP Multimedia Subsystem (IMS) network, the application server includes: a receiving module, configured to: receive a call to the user terminal; and a call initiation module, configured to: When receiving a call to the user terminal, if the user terminal is in an idle state signaling reduction (ISR) area, a call to the user terminal is initiated simultaneously with the circuit domain through the packet domain.
  • IMS IP Multimedia Subsystem
  • the application server further includes a judging module.
  • the receiving module is further configured to: receive an IMS registration initiated by the user terminal when entering the ISR region, where the registration message carries an ISR identifier, where the ISR identifier indicates that the user terminal enters an ISR region; The user terminal is judged to be in the ISR area according to the ISR identifier.
  • the application server further includes a judging module.
  • the receiving module is further configured to: receive the information of the user terminal that is actively sent by the home user server, where the information of the user terminal carries the ISR identifier; and the ISR identifier is that the user terminal sends the ISR area to the home subscriber server.
  • the application server further includes a query module; the query module is configured to: query the home user server for information of the user terminal; and the receiving module is further configured to: when receiving the query of the application server by the home user server, send the user to the application server
  • the information of the terminal, the information of the user terminal carries the ISR identifier; the ISR identifier is a message that is sent to the home subscriber server when the user terminal enters the ISR region and carries an ISR identifier that is used to indicate that the user terminal enters the ISR region.
  • the determining module is configured to: determine, according to the ISR identifier, that the user terminal is in an ISR area.
  • the receiving module is further configured to: when the user terminal leaves the ISR area, cancel the ISR identifier of the user terminal.
  • the receiving module is further configured to: after receiving the response message from any of the domain in the packet domain or the circuit domain, forward the response message, and discard the reject call message received from another domain.
  • the present invention performs PS domain and CS domain calls in parallel under the condition of starting the ISR function, thereby shortening the call setup time.
  • the invention effectively solves the problem of serially trying different domains in the prior art, and at the same time avoids unnecessary attempts to different domains, and ensures high efficiency at the lowest cost.

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Description

一种空闲态信令减少条件下的终呼实现方法和系统
技术领域 本发明涉及通信领域,更具体地涉及一种 IP多媒体子系统中空闲态信令 减少条件下的终呼实现方法和系统。
背景技术
网络互联协议( Internet Protocol, 简称 IP )多媒体子系统( IP Multimedia Subsystem, 简称 IMS )是由第三代合作伙伴计划(3rd Generation Partnership Project,简称 3GPP)提出的一种基于 IP的网络架构 IMS构建了一个开放而灵 活的业务环境, 支持多媒体应用, 能够为用户提供丰富的多媒体业务。 在 IMS业务体系中 ,控制层和业务层是分离的,控制层不提供具体业务, 只向业务层提供必要的触发、 路由、 以及计费等功能。 控制层中业务触发和 控制功能是呼叫会话控制功能 ( Call Session Control Function, 简称 CSCF ) 完成的, CSCF分为代理(Proxy ) 、 查询 (Interrogating )和服务(Serving ) 三种类型, 其中负主要责任的是 Serving, 而 Interrogating类型是可选的。 业 务层是由一系列应用服务器(Application Server, 简称 AS )组成, 能提供具 体业务服务, AS可以是独立的实体,也可以存在于服务 CSCF( Serving-CSCF, 简称 S-CSCF )中。 控制层 S-CSCF根据用户的签约信息控制业务触发, 调用 AS 上的业务, 实现业务功能。 会话中的端到端设备称为用户设备(User Equipment, 简称 UE ) , 负责与使用者的交互。 移动用户设备可通过 2G/3G 网络的分组交换(Packet Switching, 简称 PS )域接入 IMS网络, 也可通过 长期演进( Long Term Evolution,简称 LTE,该网络只有 PS域)网络接入 IMS 网络, 还可通过 2G/3G网络的电路交换(Circuit Switching, 简称 CS )域与 IMS网络的媒体网关控制功能( Media Gateway Control Function,简称 MGCF ) 交互实现 CS域信令与 IMS 网络信令的转换, 从而使 IMS 网络也能为接入 CS域的终端提供服务。 当用户终端同时处于 2G/3G网络及 LTE网络的覆盖 下时, 用户终端可以根据情况决定接入 LTE网络还是 2G/3G网络的 PS域或 CS域。 一般而言, 2G/3G网络的 PS域无法提供语音通信能力, 主要提供数 据下载能力。 当移动用户终端在空闲态下处于 LTE网络和 2G/3G网络的共同覆盖中 时, 终端在该区域下来回移动时, LTE网络和 2G/3G网络的信号强度会发生 强弱的来回变化, 如果终端及网络按正常要求不断执行附着操作, 将使终端 和接入网络及接入网络与归属网络间发生大量信令交互, 影响系统效率, 为 避免这种情况, 网络可通知终端启动空闲态信令减少 (Idle Signalling Reduction, 简称 ISR )功能, 使得在上述情况下, 接入网络和归属网络间没 有信令交互, 终端和接入网间的信令交互也保持最低限度, 这一共同覆盖并 具有 ISR功能的区域可称为 ISR区域。 图 1是终端 UE-A处于 LTE网络和 2G/3G网络共同覆盖下时的网络架构 图示意图, 描述了 UE-A处于 LTE网络和 2G/3G网络的共同覆盖下, 其中 UE-B是 IMS终端, 图中通道描述如下: 通道 101、 UE-A与 2G/3G网络的 CS域交互信令通道, 当 UE-A接入 2G/3G网络的 CS域时通过该通道与 MSC交互 CS信令; 通道 102、 MSC与 IMS网络的转换网关 MGCF交互 CS信令的通道; 通道 103、 MGCF与 IMS网络的 CSCF间交互 IMS信令的通道, MGCF 负责实现 CS信令与 IMS信令的互转; 通道 104、 UE-A与 IMS网络的 CSCF间交互 IMS信令的通道, 该通道 消息通过 2G/3G网络的 PS域或 LTE网络提供的承载传输; 通道 105、 CSCF与应用服务器 (AS ) 间交互 IMS信令的通道; 通道 106、 CSCF与 IMS终端 UE-B间交互 IMS信令的通道; 当 UE-A及网络没有启动 ISR功能时, UE-A会根据信号强度决定接入 哪个网络, 并执行附着操作。 附着操作完成后再执行 IMS网络的注册操作, 从而使用 IMS 网络的服务, 在注册操作中通知 IMS网络接入网络的变化。 当 UE-A及网络启动 ISR功能时, UE-A在来回接入 2G/3G网络或 LTE网络 时, 不再执行附着操作, 也不会执行 IMS的注册操作。 图 2是现有的启动 ISR功能的条件下 UE-A的终呼流程图,描述了 UE-A 在空闲态时处于 2G/3G网络和 LTE网络的共同覆盖下, UE-A及网络启动了 ISR功能, UE-B呼叫 UE- A的过程, 其过程如下: 步骤 201、 UE-A接入 LTE网络,并通过 CSCF注册到 IMS网络中, CSCF 通过第三方注册将 UE-A注册到 AS中, UE-A在空闲态从 LTE网络移动到 LTE网络和 2G/3G网络的共同覆盖区域, LTE网络会指示 UE-A启动 ISR功 能, 因此在此区域不会再因接入网络的变化而发起 IMS注册; 步骤 202、 UE-A根据信号强度变化接入 2G/3G网络, 但不发起 IMS注 册; 步骤 203 204、 UE-B发起到 UE-A的 IMS呼叫, 比如发送 IMS信令的 邀请(INVITE ) 消息, 消息目标为 UE-A的 IMS域标识, 消息途经 P-CSCF 和 S-CSCF到达 AS ( S-CSCF和 P-CSCF都属于 CSCF的一种 ) ; 步骤 205、 AS根据 UE-A的注册信息, 决定通过 PS域向 UE-A发起呼 叫;
步骤 206、 AS转发步骤 204收到的 IMS呼叫消息, 并指示通过 PS域发 送给 UE-A, 比如在 INVITE消息中指定路由到 P-CSCF, 消息途经 S-CSCF 到达 P-CSCF; 步骤 207、 P-CSCF通过 LTE网络向 UE-A发送呼叫消息; 步骤 208、 LTE网络会在 LTE网络下寻呼 UE-A, 同时也会要求 2G/3G 网络的 PS域一同寻呼 UE-A, 因此总能找到 UE-A, UE-A接入在 2G/3G网 络, 因此 LTE网络向 2G/3G网络的 PS域转发呼叫消息, UE-A接收到 IMS 呼叫消息, 发现其所在 2G/3G网络的 PS域不支持语音通信; 步骤 209、 UE-A返回 IMS的拒绝呼叫消息, 比如发送 IMS的 "488 Not Acceptable here" 消息, 消息途经 2G/3G网络的 PS域、 LTE网络到达 IMS 网络的 CSCF; 步骤 210、 CSCF转发拒绝呼叫消息给 AS; 步骤 211、 AS决定再通过 CS域尝试呼叫 UE-A; 步骤 212、 AS转发步骤 204收到的 IMS呼叫消息, 并指示通过 CS域发 送给 UE-A, 比如在 INVITE消息中指定路由到 MGCF, 并将呼叫目标改为 UE-A的号码, 而非 IMS域的标识, 消息到达 S-CSCF; 步骤 213、 S-CSCF转发 IMS呼叫消息到 MGCF; 步骤 214、 MGCF将 IMS呼叫消息转换为 CS域的局间呼叫消息, 比如 发送初始地址消息 (Initial Address Message, 简称 IAM ) , ΙΑΜ 的目标为 UE-A的号码, 该 IAM到达 2G/3G网络的 CS域; 步骤 215、 2G/3G网络的 CS域收到 IAM, 于是先通过 2G/3G网络的 CS 域和 /或 PS域寻呼 UE-A, UE-A响应寻呼后, 再发送 CS域的局内呼叫消息 给 UE-A, 比如发送建立 (SETUP ) 消息, 消息的目标为 UE-A的号码, 消 息到达 UE-A; 步骤 216、 UE-A应答 CS域的呼叫, 比如发送连接(CONNECT )消息, 消息到达 2G/3G网络的 CS域; 步骤 217、 2G/3G网络的 CS域应答 CS域的局间呼叫, 比如发送应答消 息 ( Answer Message, 简称 ANM ) , 消息到达 MGCF; 步骤 218~219、 MGCF将 CS域的 ANM消息转换为 IMS域的应答消息, 比如发送 IMS的 "200 OK" 消息, 消息途经 S-CSCF到达 AS; 步骤 220 221、 AS转发应答消息给 UE-B, 消息途经 S-CSCF和 P-CSCF 到达 UE-B。 至此, UE-A和 UE-B间建立起通信连接。
上述现有的 ISR条件下的终呼方法, 呼叫建立时间过长。
发明内容 本发明要解决的技术问题是提供一种 ISR条件下的终呼实现方法和系 统, 有效的解决了现有技术中串行尝试不同域的问题, 同时又避免了不必要 的尝试不同域, 最低代价地保证了高效性。 为了解决上述问题, 本发明提供了一种空闲态信令减少条件下的终呼实 现方法, 应用于 IP多媒体子系统(IMS ) 网络, 该方法包括:
IMS网络的应用服务器收到对用户终端的呼叫时, 如果所述用户终端在 空闲态信令减少 (ISR ) 区域, 则所述应用服务器通过分组域与电路域同时 发起对所述用户终端的呼叫。
IMS网络的应用服务器收到对用户终端的呼叫时, 所述方法还包括: 所 述应用服务器根据所述用户终端的 ISR标识判断所述用户终端在 ISR区域; 其中
所述 ISR标识通过如下方式获得:用户终端在进入 ISR区域时,发起 IMS 注册到所述应用服务器, 注册消息中携带 ISR标识, 所述 ISR标识指示所述 用户终端进入 ISR区域。
IMS网络的应用服务器收到对用户终端的呼叫时, 所述方法还包括: 所 述应用服务器根据所述用户终端的 ISR标识判断所述用户终端在 ISR区域; 其中 所述 ISR标识通过如下方式获得: 用户终端在进入 ISR区域时, 长期演进( LTE ) 网络设备向归属用户服 务器发送携带 ISR标识的消息, 所述 ISR标识指示所述用户终端进入 ISR区 域; 以及 所述归属用户服务器主动向所述应用服务器发送所述用户终端的信息, 所述用户终端的信息中携带所述 ISR标识; 或者, 所述归属用户服务器收到所述应用服务器的查询时, 发送所述用户终端 的信息至所述应用服务器, 所述用户终端的信息中携带所述 ISR标识。 所述方法还包括: 所述用户终端离开 ISR区域时, 所述应用服务器取消 该用户终端的 ISR标识。 所述应用服务器通过分组域与电路域同时发起对所述用户终端的呼叫的 步骤之后, 所述方法还包括: 所述应用服务器从所述分组域或电路域中任一 域收到应答消息后, 转发所述应答消息, 丟弃从另一域接收到的拒绝呼叫消 息。
为了解决上述问题, 本发明还提供了一种空闲态信令减少条件下的终呼 实现系统,应用于 IP多媒体子系统(IMS )网络,该系统包括用户终端和 IMS 网络的应用服务器, 其中: 所述应用服务器设置为: 收到对用户终端的呼叫时, 如果所述用户终端 在空闲态信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对所述用户 终端的呼叫。 所述用户终端设置为: 在进入 ISR区域时,发起 IMS注册到所述应用服 务器, 注册消息中携带 ISR标识, 所述 ISR标识指示所述用户终端进入 ISR 区域; 所述应用服务器还设置为: 根据所述 ISR标识判断所述用户终端在 ISR 区域。 所述系统还包括长期演进(LTE ) 网络设备和归属用户服务器, 其中: 所述 LTE网络设备设置为: 在用户终端在进入 ISR区域时, 向归属用户 服务器发送携带 ISR标识的消息, 所述 ISR标识指示所述用户终端进入 ISR 区域; 所述归属用户服务器设置为: 主动向所述应用服务器发送所述用户终端 的信息, 所述用户终端的信息中携带所述 ISR标识; 或者, 收到所述应用服 务器的查询时, 向所述应用服务器发送所述用户终端的信息, 所述用户终端 的信息中携带所述 ISR标识; 所述应用服务器还设置为: 根据所述 ISR标识判断所述用户终端在 ISR 区域。 所述应用服务器还设置为: 在所述用户终端离开 ISR区域时, 取消该用 户终端的 ISR标识。 所述应用服务器还设置为: 从所述分组域或电路域中任一域收到应答消 息后, 转发所述应答消息, 丟弃从另一域接收到的拒绝呼叫消息。
为了解决上述问题, 本发明还提供了一种应用服务器,应用于 IP多媒体 子系统(IMS ) 网络, 该应用服务器包括: 接收模块, 其设置为: 接收对用户终端的呼叫; 以及 呼叫发起模块, 其设置为: 接收到对用户终端的呼叫时, 如果所述用户 终端在空闲态信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对所述 用户终端的呼叫。 所述应用服务器还包括判断模块; 所述接收模块还设置为: 接收用户终端在进入 ISR区域时, 发起的 IMS 注册, 注册消息中携带 ISR标识, 所述 ISR标识指示所述用户终端进入 ISR 区域; 所述判断模块设置为:根据所述 ISR标识判断所述用户终端在 ISR区域。 所述应用服务器还包括判断模块; 所述接收模块还设置为: 接收归属用户服务器主动发送的所述用户终端 的信息, 所述用户终端的信息中携带 ISR标识; 所述 ISR标识为用户终端在 进入 ISR 区域时向归属用户服务器发送的携带用于指示所述用户终端进入 ISR区域的 ISR标识的消息; 或者, 所述应用服务器还包括查询模块; 所述查询模块设置为: 向归属用户服 务器查询用户终端的信息; 所述接收模块还设置为: 接收归属用户服务器收 到所述应用服务器的查询时, 向所述应用服务器发送所述用户终端的信息, 所述用户终端的信息中携带 ISR标识; 所述 ISR标识为用户终端在进入 ISR 区域时向归属用户服务器发送的携带用于指示所述用户终端进入 ISR区域的 ISR标识的消息; 以及 所述判断模块设置为:根据所述 ISR标识判断所述用户终端在 ISR区域。 所述接收模块还设置为: 在所述用户终端离开 ISR区域时, 取消该用户 终端的 ISR标识。 所述接收模块还设置为: 从所述分组域或电路域中任一域收到应答消息 后, 转发所述应答消息, 丟弃从另一域接收到的拒绝呼叫消息。 本发明所述方法和系统, 在 ISR条件下, 并行执行 PS域和 CS域呼叫, 缩短了呼叫建立时间。 本发明有效的解决了现有技术中串行尝试不同域的问 题, 同时又避免了不必要的尝试不同域, 最低代价地保证了高效性。
附图概述 图 1是终端处于 LTE网络和 2G/3G网络共同覆盖下时的网络架构图示 意图; 图 2是现有的 ISR条件下 UE-A的终呼流程图; 图 3是本发明的 ISR条件下 UE-A的终呼流程图 1 ; 图 4是本发明的 ISR条件下 UE-A的终呼流程图 2; 图 5是本发明的 ISR条件下 UE-A的终呼流程图 3。
本发明的较佳实施方式 下面将结合附图及实施例对本发明的技术方案进行更详细的说明。 本发明提供的空闲信令减少条件下的终呼实现方法主要包括:
IMS网络的 AS收到对 UE的呼叫时, 如果所述 UE在 ISR区域, 则所 述 AS通过 PS域与 CS域同时发起对所述 UE的呼叫。 优选的,该方法还包括: AS根据所述 UE的 ISR标识判断所述 UE在 ISR 区域, AS通过如下方式获得 ISR标识: UE在进入 ISR区域时发起 IMS注册到所述应用服务器, 注册消息中携 带 ISR标识, 该 ISR标识指示所述 UE在 ISR区域; AS保存该 ISR标识; 其中, UE通过网络指示得知其在 ISR区域; 或者, UE在进入 ISR区域时, LTE网络设备向归属用户服务器( Home Subscriber Server, 简称 HSS )发送携带 ISR标识的消息, 该 ISR标识指示 UE在 ISR区域, HSS向 AS主动发送该 UE的信息,信息中携带该 ISR标识, 或者 HSS收到 AS的查询时, 返回该 UE的信息给 HSS, 信息中携带该 ISR 标识, AS保存该 ISR标识。 优选的, 所述 UE在离开 ISR区域时, 发送不带 ISR标识的 IMS注册消 息取消 AS中的 ISR标识; 或者, LTE网络设备向 HSS发送不带 ISR标识的 消息 , 从而取消 AS中的 ISR标识。 优选的, 所述 AS通过 PS域发起呼叫是将呼叫转发给 P-CSCF。 优选的, 所述 AS通过 CS域发起呼叫是将呼叫转发给 MGCF。 优选的, 所述 AS收到从 PS域和 CS域中任一域收到应答消息后, 转发 所述应答消息, 丟弃从另一域收到的拒绝呼叫消息。
图 3是本发明的 ISR条件下 UE-A的终呼流程图 1 , 描述了 UE-A在空 闲态时处于 2G/3G网络和 LTE网络的共同覆盖下, UE-A及网络启动了 ISR 功能, UE-B呼叫 UE-A的过程, 其过程如下: 步骤 301、 UE-A进入 ISR区域; 步骤 302、 UE-A发起 IMS注册, 注册消息中携带 ISR标识, 该注册消 息通过 LTE网络作为承载进行传送; 步骤 303、 注册消息到达 CSCF, CSCF通过第三方注册过程将注册消息 发送给 AS, 从而 AS获得 ISR标识, AS保存该 ISR标识; 步骤 304、 UE-A根据信号强度变化,接入了 2G/3G网络,但不发起 IMS 注册; 步骤 305~306、 UE-B发起到 UE-A的 IMS呼叫, 比如发送 IMS信令的
INVITE消息,消息目标为 UE-A的 IMS域标识,消息途经 P-CSCF和 S-CSCF 到达 AS ( S-CSCF和 P-CSCF都属于 CSCF的一种 ) ; 步骤 307、 AS根据 ISR标识判断 UE-A在 ISR区域, 因此决定同时通过 PS域和 CS域呼叫 UE-A; 步骤 308 312、 与图 2的步骤 206-210相同; 步骤 313~322、 与图 2的步骤 212~221相同; 其中步骤 308~312与步骤 313~322为同时执行, 没有先后顺序关系。 本实施例中, 如果 UE-A离开了 ISR区域, 则 UE-A发送不带 ISR标识 的 IMS注册消息以取消 AS中的 ISR标识。
图 4是本发明的 ISR条件下 UE-A的终呼流程图 2, 描述了 UE-A在空 闲态时处于 2G/3G网络和 LTE网络的共同覆盖下, UE-A及网络启动了 ISR 功能, UE-B呼叫 UE-A的过程, 其过程如下: 步骤 401~403、 与图 3的步骤 301~303相同; 即 UE-A在进入 ISR区域 时, 通过 CSCF注册到 IMS网络中, 注册消息携带 ISR标识, CSCF通过第 三方注册将 UE-A注册到 AS中, 从而 AS也获得 ISR标识; 步骤 404、 UE-A在 ISR区域来回移动, 并根据信号强度接入了 LTE网 络, 因启动了 ISR功能而没有任何到归属网的消息, UE-A也不发起 IMS注 册消息;
步骤 405~407、 UE-B发起到 UE-A的 IMS呼叫, 比如发送 IMS信令的 INVITE消息,消息目标为 UE-A的 IMS域标识,消息途经 P-CSCF和 S-CSCF 到达 AS;
AS根据 ISR标识判断 UE-A在 ISR区域, 因此决定同时通过 PS域和 CS域呼叫 UE-A; 步骤 408、 AS转发步骤 406收到的 IMS呼叫消息, 并指示通过 PS域发 送给 UE-A, 比如在 INVITE消息中指定路由到 P-CSCF, 消息途经 S-CSCF 到达 P-CSCF; 步骤 409、 P-CSCF通过 LTE网络向 UE-A发送呼叫消息; LTE网络会 在 LTE网络下寻呼 UE-A,同时也会要求 2G/3G网络的 PS域一同寻呼 UE-A, 因此总能找到 UE-A; UE-A接入在 LTE网络, 因此 LTE网络转发 IMS呼叫 消息给 UE-A; 步骤 410、 UE-A接收到 IMS呼叫消息, 发现其所在 LTE网络支持语音 通信 步骤 411、 UE-A返回 IMS的应答呼叫消息, 比如发送 IMS的 "200 OK" 消息, 消息途经 LTE网络到达 IMS网络的 CSCF; 步骤 412、 CSCF转发应答呼叫消息给 AS; 步骤 413 414、 AS转发应答消息给 UE-B, 消息途经 S-CSCF和 P-CSCF 到达 UE-B; 与步骤 408~414同时进行的是以下步骤: 步骤 415~417、 与图 3的步骤 313~315相同; 步骤 418、 UE-A在 LTE网络, 2G/3G的 CS域寻呼不到; 步骤 419、 2G/3G的 CS域返回 CS域的局间拒绝呼叫消息, 比如发送释 放(RELEASE ) 消息; 步骤 420、 CS域的局间拒绝呼叫消息到达 MGCF , MGCF将其转换为 IMS 的拒绝呼叫消息, 比如发送 "488 Not Acceptable here" ; 步骤 421、 IMS的拒绝呼叫消息到达 CSCF, CSCF转发其到 AS, AS并 不转发该拒绝消息给 UE-B。 本实施例中, 如果 UE-A离开了 ISR区域, 则 UE-A发送不带 ISR标识 的 IMS注册消息以取消 AS中的 ISR标识。
以下实施例, 需要使用到 HSS, 其是 IMS网络的一个网元, 为简化流程 描述, 本实施例将 AS与 CSCF合并为一个实体, 其间的流程为标准化的。 图 5是本发明的 ISR条件下 UE-A的终呼流程图 3 , 描述了 UE-A在空 闲态时处于 2G/3G网络和 LTE网络的共同覆盖下, UE-A及网络启动了 ISR 功能, UE-B呼叫 UE-A的过程, 其过程如下: 步骤 501、 与图 2的步骤 201相同; 步骤 502、 LTE网络向 HSS发送通知消息, 携带 ISR指示, 比如 LTE 网络的移动管理实体( Mobile Management Entity , 简称 ΜΜΕ )发送通知消 息; 步骤 503、 UE-A根据信号强度变化,接入了 2G/3G网络,但不发起 IMS 注册; 步骤 504、 UE-B发起到 UE-A的 IMS呼叫, 比如发送 IMS信令的邀请 ( INVITE ) 消息, 消息目标为 UE-A的 IMS域标识, 消息途经 CSCF到达 AS; 步骤 505、 应用服务器 AS与 HSS交互获得 UE-A的相关信息, 从而获 得 UE-A的 ISR标识, 于是决定通过 PS域向 UE-A发起呼叫, AS可以主动 向 HSS询问 UE-A的信息, HSS收到 AS的查询后,返回 UE-A的信息给 HSS, 信息中携带 UE-A的 ISR标识, 也可以在步骤 502时 HSS主动向 AS通知 UE-A的信息, 信息中携带 UE-A的 ISR标识; 步骤 506-515, 与图 3的步骤 308-322相同; 至此, UE-A和 UE-B间建立起通信连接。 本实施例中 ,如果 UE-A离开了 ISR区域,则 LTE网络设备,比如 MME, 向 HSS发送不带 ISR标识的消息以取消 AS中的 ISR标识。
本实施例还提供了一种空闲态信令减少条件下的终呼实现系统, 应用于 IP多媒体子系统( IMS ) 网络, 该系统包括用户终端和 IMS网络的应用服务 器, 其中:
应用服务器设置为: 收到对用户终端的呼叫时, 如果用户终端在空闲态 信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对该用户终端的呼叫。 优选的, 用户终端设置为: 在进入 ISR区域时, 发起 IMS注册到该应用 服务器, 注册消息中携带 ISR标识, ISR标识指示用户终端进入 ISR区域; 应用服务器还设置为: 根据 ISR标识判断用户终端在 ISR区域。 或者, 优选的, 该系统还包括 LTE网络设备和归属用户服务器, 其中:
LTE网络设备设置为: 在用户终端在进入 ISR区域时, 向归属用户服务 器发送携带 ISR标识的消息, 该 ISR标识指示所述用户终端进入 ISR区域; 归属用户服务器设置为: 主动向应用服务器发送用户终端的信息, 用户 终端的信息中携带所述 ISR标识; 或者, 收到应用服务器的查询时, 向应用 服务器发送用户终端的信息, 用户终端的信息中携带所述 ISR标识; 应用服务器还设置为: 根据 ISR标识判断用户终端在 ISR区域。 优选的, 应用服务器还设置为: 在用户终端离开 ISR区域时, 取消该用 户终端的 ISR标识。 优选的, 应用服务器还设置为: 从分组域或电路域中任一域收到应答消 息后, 转发所述应答消息, 丟弃从另一域接收到的拒绝呼叫消息。 本实施例还提供了一种应用服务器, 应用于 IP多媒体子系统(IMS ) 网 络, 该应用服务器包括: 接收模块, 其设置为: 接收对用户终端的呼叫; 以及 呼叫发起模块, 其设置为: 接收到对用户终端的呼叫时, 如果用户终端 在空闲态信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对用户终端 的呼叫。
应用服务器还包括判断模块; 接收模块还设置为:接收用户终端在进入 ISR区域时,发起的 IMS注册, 注册消息中携带 ISR标识, ISR标识指示所述用户终端进入 ISR区域; 判断模块设置为: 根据 ISR标识判断用户终端在 ISR区域。 应用服务器还包括判断模块; 接收模块还设置为: 接收归属用户服务器主动发送的所述用户终端的信 息, 用户终端的信息中携带 ISR标识; ISR标识为用户终端在进入 ISR区域 时向归属用户服务器发送的携带用于指示所述用户终端进入 ISR区域的 ISR 标识的消息; 或者, 应用服务器还包括查询模块; 该查询模块设置为: 向归属用户服务器查 询用户终端的信息; 接收模块还设置为: 接收归属用户服务器收到所述应用 服务器的查询时, 向应用服务器发送用户终端的信息, 用户终端的信息中携 带 ISR标识; 所述 ISR标识为用户终端在进入 ISR区域时向归属用户服务器 发送的携带用于指示用户终端进入 ISR区域的 ISR标识的消息;
以及 判断模块设置为: 根据所述 ISR标识判断所述用户终端在 ISR区域。 优选的, 接收模块还设置为: 在用户终端离开 ISR区域时, 取消该用户 终端的 ISR标识。 优选的, 接收模块还设置为: 从所述分组域或电路域中任一域收到应答 消息后, 转发所述应答消息, 丟弃从另一域接收到的拒绝呼叫消息。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明在启动 ISR功能条件下, 并行执行 PS域和 CS域呼叫,缩短了呼 叫建立时间。 本发明有效的解决了现有技术中串行尝试不同域的问题, 同时 又避免了不必要的尝试不同域, 最低代价地保证了高效性。

Claims

权 利 要 求 书
1、 一种空闲态信令减少条件下的终呼实现方法, 应用于 IP多媒体子系 统(IMS ) 网络, 该方法包括:
IMS网络的应用服务器收到对用户终端的呼叫时, 如果所述用户终端在 空闲态信令减少 (ISR ) 区域, 则所述应用服务器通过分组域与电路域同时 发起对所述用户终端的呼叫。
2、 如权利要求 1 所述的方法, 其中, IMS 网络的应用服务器收到对用 户终端的呼叫时,所述方法还包括:所述应用服务器根据所述用户终端的 ISR 标识判断所述用户终端在 ISR区域; 其中 所述 ISR标识通过如下方式获得:用户终端在进入 ISR区域时,发起 IMS 注册到所述应用服务器, 注册消息中携带 ISR标识, 所述 ISR标识指示所述 用户终端进入 ISR区域。
3、 如权利要求 1 所述的方法, 其中, IMS 网络的应用服务器收到对用 户终端的呼叫时,所述方法还包括:所述应用服务器根据所述用户终端的 ISR 标识判断所述用户终端在 ISR区域; 其中 所述 ISR标识通过如下方式获得: 用户终端在进入 ISR区域时, 长期演进( LTE ) 网络设备向归属用户服 务器发送携带 ISR标识的消息, 所述 ISR标识指示所述用户终端进入 ISR区 域; 以及 所述归属用户服务器主动向所述应用服务器发送所述用户终端的信息, 所述用户终端的信息中携带所述 ISR标识; 或者, 所述归属用户服务器收到所述应用服务器的查询时, 发送所述用户终端 的信息至所述应用服务器, 所述用户终端的信息中携带所述 ISR标识。
4、 如权利要求 2或 3所述的方法, 其中, 所述方法还包括: 所述用户终 端离开 ISR区域时, 所述应用服务器取消该用户终端的 ISR标识。
5、如权利要求 1或 2或 3所述的方法, 其中, 所述应用服务器通过分组 域与电路域同时发起对所述用户终端的呼叫的步骤之后, 所述方法还包括: 所述应用服务器从所述分组域或电路域中任一域收到应答消息后, 转发所述 应答消息, 丟弃从另一域接收到的拒绝呼叫消息。
6、 一种空闲态信令减少条件下的终呼实现系统, 应用于 IP多媒体子系 统(IMS ) 网络, 该系统包括用户终端和 IMS网络的应用服务器, 其中: 所述应用服务器设置为: 收到对用户终端的呼叫时, 如果所述用户终端 在空闲态信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对所述用户 终端的呼叫。
7、 如权利要求 6所述的系统, 其中: 所述用户终端设置为: 在进入 ISR 区域时, 发起 IMS注册到所述应用服务器, 注册消息中携带 ISR标识, 所述 ISR标识指示所述用户终端进入 ISR区域; 所述应用服务器还设置为: 根据所述 ISR标识判断所述用户终端在 ISR 区域。
8、 如权利要求 6所述的系统, 其中, 所述系统还包括长期演进(LTE ) 网络设备和归属用户服务器, 其中: 所述 LTE网络设备设置为: 在用户终端在进入 ISR区域时, 向归属用户 服务器发送携带 ISR标识的消息, 所述 ISR标识指示所述用户终端进入 ISR 区域; 所述归属用户服务器设置为: 主动向所述应用服务器发送所述用户终端 的信息, 所述用户终端的信息中携带所述 ISR标识; 或者, 收到所述应用服 务器的查询时, 向所述应用服务器发送所述用户终端的信息, 所述用户终端 的信息中携带所述 ISR标识; 所述应用服务器还设置为: 根据所述 ISR标识判断所述用户终端在 ISR 区域。
9、 如权利要求 7或 8所述的系统, 其中, 所述应用服务器还设置为: 在 所述用户终端离开 ISR区域时, 取消该用户终端的 ISR标识。
10、 如权利要求 6至 8中任一项所述的系统, 其中, 所述应用服务器还 设置为: 从所述分组域或电路域中任一域收到应答消息后, 转发所述应答消 息, 丟弃从另一域接收到的拒绝呼叫消息。
11、 一种应用服务器, 应用于 IP多媒体子系统(IMS ) 网络, 该应用服 务器包括: 接收模块, 其设置为: 接收对用户终端的呼叫; 以及 呼叫发起模块, 其设置为: 接收到对用户终端的呼叫时, 如果所述用户 终端在空闲态信令减少 (ISR ) 区域, 通过分组域与电路域同时发起对所述 用户终端的呼叫。
12、如权利要求 11所述的应用服务器, 其中, 所述应用服务器还包括判 断模块;
所述接收模块还设置为: 接收用户终端在进入 ISR区域时, 发起的 IMS 注册, 注册消息中携带 ISR标识, 所述 ISR标识指示所述用户终端进入 ISR 区域; 所述判断模块设置为:根据所述 ISR标识判断所述用户终端在 ISR区域。
13、如权利要求 11所述的应用服务器, 其中, 所述应用服务器还包括判 断模块; 所述接收模块还设置为: 接收归属用户服务器主动发送的所述用户终端 的信息, 所述用户终端的信息中携带 ISR标识; 所述 ISR标识为用户终端在 进入 ISR 区域时向归属用户服务器发送的携带用于指示所述用户终端进入 ISR区域的 ISR标识的消息; 或者, 所述应用服务器还包括查询模块; 所述查询模块设置为: 向归属用户服 务器查询用户终端的信息; 所述接收模块还设置为: 接收归属用户服务器收 到所述应用服务器的查询时, 向所述应用服务器发送所述用户终端的信息, 所述用户终端的信息中携带 ISR标识; 所述 ISR标识为用户终端在进入 ISR 区域时向归属用户服务器发送的携带用于指示所述用户终端进入 ISR区域的 ISR标识的消息; 以及 所述判断模块设置为:根据所述 ISR标识判断所述用户终端在 ISR区域。
14、 如权利要求 12或 13所述的应用服务器, 其中, 所述接收模块还设 置为: 在所述用户终端离开 ISR区域时, 取消该用户终端的 ISR标识。
15、 如权利要求 11至 14中任一项所述的应用服务器, 其中, 所述接收 模块还设置为: 从所述分组域或电路域中任一域收到应答消息后, 转发所述 应答消息, 丟弃从另一域接收到的拒绝呼叫消息。
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