WO2009121282A1 - A method and a base station for call set-up - Google Patents

A method and a base station for call set-up Download PDF

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Publication number
WO2009121282A1
WO2009121282A1 PCT/CN2009/071031 CN2009071031W WO2009121282A1 WO 2009121282 A1 WO2009121282 A1 WO 2009121282A1 CN 2009071031 W CN2009071031 W CN 2009071031W WO 2009121282 A1 WO2009121282 A1 WO 2009121282A1
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Prior art keywords
target network
network
transmission mode
domain
mobile terminal
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PCT/CN2009/071031
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French (fr)
Chinese (zh)
Inventor
赵旸
王济勇
余勇军
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华为技术有限公司
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Publication of WO2009121282A1 publication Critical patent/WO2009121282A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a base station for call setup. Background technique
  • Second-generation mobile communication technology 2nd Generation, 2G or third-generation mobile communication technology (3rd generation, 3G) network
  • GSM Global System for Mobile Communication
  • WCDMA Wideband Code Division Multiple Access
  • WCDMA Code Division Multiple Access
  • SAE System Architecture Evolution
  • HSPA High Speed Packet Access
  • HSPA+ High Speed Packet Access Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • VoIP Voice over Internet Protocol
  • IMS IP Multimedia Subsystem
  • voice calls can only be transmitted on their PS domain bearers. Voice over calls are controlled over IP-based networks. In a 2G or 3G network, voice calls are generally carried on the CS domain.
  • the user who initiates the call can span the network of two different bearer mechanisms during a call, because the mobile communication service bears different mechanisms, for example, when the mobile terminal (User Equipment, UE) moves out of the base station of the pure PS domain network.
  • the range when entering the coverage area of a base station of a 2G or 3G network, may cause a discontinuity of a voice call, thereby affecting the continuity of the user's voice call.
  • the CS fallback mechanism can be used for processing. For example, when the mobile phone initiates a CS call or responds to the CS paging on the LTE network, Switch or reselect to GSM/EDGE radio access network
  • GSM I EDGE Radio Access Network GERAN
  • UTRAN global Terrestrial Radio Access Network
  • the GERAN or UTRAN network performs the circuit domain call setup procedure.
  • the inventor found in the process of implementing the present invention that, in the above solution, if the target network supports
  • the CS service is performed at the same time, that is, after the PS handover, the CS service cannot be established before the PS service is released, resulting in the delay of the CS service establishment.
  • the embodiment of the invention provides a method for establishing a call and a base station to ensure fallback to the CS domain.
  • an embodiment of the present invention discloses a method for establishing a call, including:
  • the pure packet switched domain source network acquires dual transmission mode capability information of the target network that carries the session type service by the circuit domain;
  • the source network After the source network receives the circuit domain service request, if the target network supports the packet switched domain handover and the dual transmission mode, performing a packet switched domain handover, and performing circuit domain call on the target network. Call the establishment process.
  • an embodiment of the present invention further discloses a call setup method, including: a pure packet switched domain source network acquires dual transmission mode capability information of a target network that carries a session type service by a circuit domain;
  • the mobile terminal After the source network receives the circuit domain service request, if the target network supports the packet switched domain handover but does not support the dual transmission mode, the mobile terminal accesses the mobile terminal to the target network cell or by the network-assisted cell change procedure. The mobile terminal autonomously reselects to the target network cell, and performs a circuit domain call setup procedure on the target network.
  • the embodiment of the present invention further discloses a pure packet switched domain network base station, including: an information acquiring unit, configured to acquire dual transmission mode capability information of a target network that carries a session type service by a circuit domain;
  • a receiving unit configured to receive a circuit domain service request
  • an execution unit configured to: after the receiving unit receives the circuit domain service request, switch or reselect to the target network cell according to the dual transmission mode capability information of the target network acquired by the information acquiring unit.
  • the technical solution of the embodiment of the present invention can be seen that, by considering the DTM capability of the target access network, the CS service access delay can be reduced and the continuity of the PS domain service can be maintained during the implementation of the CS fallback mechanism. Effective execution of the CS fallback mechanism.
  • FIG. 1 is a schematic flowchart 1 of an embodiment of a method according to the present invention.
  • FIG. 2 is a schematic flowchart 2 of an embodiment of a method according to the present invention.
  • FIG. 3 is a schematic flowchart 3 of an embodiment of a method according to the present invention.
  • FIG. 4 is a schematic flow chart 4 of an embodiment of a method according to the present invention.
  • FIG. 5 is a schematic flowchart 5 of an embodiment of a method according to the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a base station according to the present invention.
  • the mobile phone When the mobile phone is in a pure PS domain network, for example, an LTE network that does not deploy IMS, when a CS call is initiated or a CS page is responded to, the CS fallback mechanism is adopted, that is, the CS domain is first switched or reselected to the CS domain to carry the session type service.
  • Network for example, GERAN or UTRAN network. The following is a description of the technical solution of the call setup method embodiment of the present invention, as shown in FIG. 1 by taking the LTE network reselection to the GERAN network as an example.
  • the source access network for example, the Evolved NodeB (eNodeB) obtains the DTM capability information of the target network in one of four ways:
  • RIM Get DTM capability information for the target network.
  • the target access network that is, the GERAN access network transparently transmits the system information including the DTM capability information to the source access network through the core network, for example, the system information including the DTM capability information may be carried in the access In the system message delivered by the network.
  • the RIM process can always be used as a necessary process.
  • the DTM capability information may be requested from the target access network when needed, and the target access network feeds back the DTM capability information to the eNodeB after receiving the request.
  • the target access network actively provides the eNodeB with its DTM capability information.
  • the foregoing four methods for obtaining the DTM capability information of the target network are merely exemplary.
  • the present invention does not limit the specific manner for obtaining the DTM capability information of the target network, and any manner that can achieve the purpose of acquiring the DTM capability information is in the present invention. Within the scope of protection.
  • the target network supports the packet switched domain handover and the dual transmission mode, performing a packet switched domain handover, and performing a circuit domain call setup procedure on the target network.
  • the evolved base station receives a circuit domain call request from the mobile terminal, that is, the terminal initiates
  • the evolved base station receives a CS call request from the mobile terminal.
  • the evolved base station may request to acquire a measurement report to determine the GERAN target cell for the packet switched domain handover, and this step is optional.
  • the evolved base station performs PS handover, for example, by sending a Relocation Required message (Relocation required) to initiate the
  • PS handover of the GERAN target cell For the specific PS handover procedure, refer to the relevant 3GPP specifications, which will not be described in detail here.
  • the mobile switching center corresponding to the GERAN network The MSC sends a circuit domain paging request to the mobility management entity MME of the LTE network, and the MME forwards the circuit domain paging request to the evolved base station of the LTE network.
  • the evolved base station may request to acquire a measurement report according to a circuit domain paging request from the core network, thereby determining a PS handover GERAN target cell, and the step is optional.
  • the evolved base station performs PS handover, for example, a PS handover to the GERAN target cell may be initiated by transmitting a Relocation Required message (Relocation required).
  • PS handover procedure refer to the relevant 3GPP specifications, which will not be described in detail here.
  • the mobile terminal establishes a CS called voice call in the target GERAN cell.
  • the target network supports the PS handover but does not support the DTM.
  • the mobile terminal accesses the mobile terminal to the target network cell or is reselected by the mobile terminal by the network-assisted cell change procedure.
  • the target network cell performs a circuit domain call setup process on the target network.
  • the evolved base station receives a circuit domain call request from the mobile terminal, that is, the terminal initiates
  • the evolved base station receives a circuit domain call request from the mobile terminal.
  • the evolved base station may request to obtain a measurement report to determine the network-assisted cell reselection of the GERAN target cell. This step is optional.
  • the target network supports PS handover but does not support DTM. Or, when the target network does not support PS handover, the evolved base station sends a cell change command to the mobile terminal, and the secondary mobile terminal reselects to the target GERAN cell. During the network-assisted cell change process, information required to accelerate the mobile terminal to access the target GERAN cell circuit domain may be transmitted to reduce the delay of circuit domain call setup. If the mobile terminal has a PS domain service, the circuit domain service is first initiated in the target network.
  • the mobile switching center MSC corresponding to the GERAN network sends a circuit domain paging request to the mobility management entity MME of the LTE network, and the MME forwards the circuit domain paging request to the evolved base station of the LTE network.
  • the evolved base station may request to acquire a measurement report according to a circuit domain paging request from the core network, thereby determining a network-assisted cell reselected GERAN target cell, and the step is optional.
  • the target network supports PS handover but does not support DTM, or when the target network does not support PS handover, the evolved base station sends a cell change command to the mobile terminal, and the secondary mobile terminal reselects to the target.
  • the circuit domain service is first initiated in the target network.
  • the mobile terminal establishes a CS called voice call in the target GERAN cell.
  • the target network supports the PS handover but does not support the DTM, or the target network does not support the PS handover, and may also be reselected by the mobile terminal to the target network cell, in the target network. Perform the circuit domain call setup process.
  • the embodiment of the invention further provides a pure packet switched domain network base station, as shown in FIG. 6, which includes:
  • the information acquiring unit 61 is configured to acquire dual transmission mode capability information of the target network that carries the session type service by the circuit domain;
  • the receiving unit 62 is configured to receive a circuit domain service request.
  • the executing unit 63 is configured to switch or reselect to the target network cell according to the dual transmission mode capability information of the target network acquired by the information acquiring unit, after the receiving unit receives the circuit domain service request.
  • the base station further includes: a measurement reporting unit 64, configured to acquire a measurement report, to determine a target cell for network-assisted cell reselection.
  • a measurement reporting unit 64 configured to acquire a measurement report, to determine a target cell for network-assisted cell reselection.
  • the execution unit may comprise one of the following modules or any combination thereof:
  • a first execution module 631 configured to perform a packet switched domain switch when the target network supports a packet switched domain handover and a dual transmission mode
  • a second executing module 632 configured to: when the target network does not support packet switched domain switching or support packet switched domain switching but does not support dual transmission mode, accessing the mobile terminal to the target network by using a network-assisted cell change procedure Community
  • a third execution module 633 configured to: when the target network does not support packet switched domain switching or branching When the packet switched domain handover is performed but the dual transmission mode is not supported, the mobile terminal is triggered to autonomously reselect to the target network cell.
  • a pure PS domain network mentioned in the embodiments of the present invention including but not limited to SAE/LTE,
  • the HSPA, HSPA+, or WiMAX network the network that carries the session type service by the CS domain mentioned in the embodiment of the present invention includes but is not limited to a 2G or 3G network.
  • the CS fallback mechanism can be correctly determined. For example, if the target network supports the PS handover but does not support the DTM, the NACC process is adopted. The mobile terminal accesses the target network cell or is autonomously reselected by the mobile terminal to the target network cell, so as to avoid releasing the PS service and then establishing the CS service, because the DTM is not supported, The CS service access delay is reduced. If the target network supports the PS handover and the DTM, the PS handover is performed to perform the CS call setup process, thereby taking into account the continuity of the PS domain service; and ensuring the effective execution of the CS fallback mechanism.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and a base station for call set-up are disclosed. By means of obtaining the dual transfer mode capability information of a target network in which session-type service is carried by the circuit domain, when a pure packet-switched domain source network receives a request for circuit domain service, if the target network supports both packet-switched domain handover and dual transfer mode, packet-switched domain handover will be performed, and the circuit domain call set-up procedure will be conducted in the target network; if the target network supports packet-switched domain handover, but does not support dual transfer mode, the mobile terminal will access the target network cell through network-assisted cell change procedures, or said mobile terminal will independently re-select the target network cell, and the circuit domain call set-up procedure will be conducted in the target network, thus reducing CS service access delay.

Description

呼叫建立的方法和基站 本申请要求 2008年 4月 3日递交的申请号为 200810066604.0、 发明名 称为 "呼叫建立的方法和基站" 的中国专利申请的优先权， 其全部内容通过 引用结合在本申请中。  The present invention claims the priority of the Chinese Patent Application No. 200810066604.0, filed on Apr. 3, 2008, which is incorporated herein by reference. in.
技术领域 Technical field
本发明涉及通信技术领域， 尤其是涉及一种呼叫建立的方法和基站。 背景技术  The present invention relates to the field of communications technologies, and in particular, to a method and a base station for call setup. Background technique
第二代移动通信技术 （2nd Generation , 2G ) 或第三代移动通信技术 (3rd Generation, 3G) 网络， 例如， 全球移动通信*** (Global System for Mobile Communication , GSM ) 或宽带码分多址 (Wideband Code Division Multiple Access, WCDMA)网络， 经过多年的部署已可以形成一种全面的覆 盖。 随着网络技术的发展， 一些仅提供分组交换域 （Packet Switched, PS ) 的纯 PS域网络已覆盖到一些城区和话务热点地区， 例如， ***架构演进 ( System Architecture Evolution, SAE) /长期演进 (Long Term Evolution, LTE) ， 高速分组接入 （High Speed Packet Access, HSPA) ， 高速分组接入 演进 （High Speed Packet Access Evolution, HSPA+ ) 或微波接入全球互通 (Worldwide Interoperability for Microwave Access, WiMAX) 网络。 因而在 目前的通信网络中， 这些纯 PS域网络和 2G或 3G网络并存。  Second-generation mobile communication technology (2nd Generation, 2G) or third-generation mobile communication technology (3rd generation, 3G) network, for example, Global System for Mobile Communication (GSM) or Wideband Code Division Multiple Access (Wideband) The Code Division Multiple Access (WCDMA) network has been able to form a comprehensive coverage after years of deployment. With the development of network technology, some pure PS domain networks that only provide Packet Switched (PS) have covered some urban areas and traffic hotspots, for example, System Architecture Evolution (SAE) / Long Term Evolution (Long Term Evolution, LTE), High Speed Packet Access (HSPA), High Speed Packet Access Evolution (HSPA+) or Worldwide Interoperability for Microwave Access (WiMAX) The internet. Therefore, in the current communication network, these pure PS domain networks coexist with 2G or 3G networks.
不同的网络具有不同的承载机制， 针对不同的网络承载机制， 可以将移 动通信的语音呼叫分为两类： 第一类是电路交换域 （Circuit Switched, CS ) 承载的会话类业务， 例如语音电话； 第二类是 PS域承载的会话类业务， 也 称为网际协议承载语音技术 ( Voice over Internet Protocol, VoIP) 类业务， 由 IP多媒体业务子*** （IP Multimedia Subsystem, IMS ) 提供业务质量 (Quality of Service, QoS) 保证， 例如 IP承载的语音电话。  Different networks have different bearer mechanisms. For different network bearer mechanisms, voice calls for mobile communication can be classified into two categories: The first type is a session type service carried by a Circuit Switched (CS), such as a voice call. The second type is the session-type service carried by the PS domain, which is also called the Voice over Internet Protocol (VoIP) service. The IP Multimedia Subsystem (IMS) provides the quality of service (Quality). Of Service, QoS) guarantees, for example, voice over IP calls.
对于纯 PS域网络， 语音呼叫一般只能在其 PS域承载上传输， IMS通 过基于 IP的网络来控制语音呼叫。 而在 2G或 3G网络中， 语音呼叫一般承 载在 CS域上。 For a pure PS domain network, voice calls can only be transmitted on their PS domain bearers. Voice over calls are controlled over IP-based networks. In a 2G or 3G network, voice calls are generally carried on the CS domain.
发起呼叫的用户在一次呼叫过程中， 可以跨越两个不同承载机制的网 络， 由于移动通信业务承载机制的不同， 例如， 当移动终端 （User Equipment, UE) 移动出纯 PS域网络的基站所覆盖的范围， 而进入 2G或 3G网络的基站的覆盖区时， 可能会出现语音呼叫的间断， 从而影响用户语 音呼叫的连续性。  The user who initiates the call can span the network of two different bearer mechanisms during a call, because the mobile communication service bears different mechanisms, for example, when the mobile terminal (User Equipment, UE) moves out of the base station of the pure PS domain network. The range, when entering the coverage area of a base station of a 2G or 3G network, may cause a discontinuity of a voice call, thereby affecting the continuity of the user's voice call.
为了解决上述问题， 保证用户语音呼叫的连续性， 对于 CS业务， 目前 可以采用回退到 CS域 （CS fallback) 机制来处理， 例如， 手机在 LTE网络 发起 CS呼叫或响应 CS寻呼时， 先切换或重选到 GSM/EDGE无线接入网 In order to solve the above problem, the continuity of the voice call of the user is guaranteed. For the CS service, the CS fallback mechanism can be used for processing. For example, when the mobile phone initiates a CS call or responds to the CS paging on the LTE network, Switch or reselect to GSM/EDGE radio access network
(GSM I EDGE Radio Access Network， GERAN)或者全球陆地无线接入网 (Universal Terrestrial Radio Access Network, UTRAN) 网络再建立 CS呼 口 H， 当所述 GERAN或 UTRAN网络支持 PS切换时， 执行 PS切换， 在所述(GSM I EDGE Radio Access Network, GERAN) or a global Terrestrial Radio Access Network (UTRAN) network re-establishes a CS call port H. When the GERAN or UTRAN network supports PS handover, PS handover is performed. In the stated
GERAN或 UTRAN网络进行电路域呼叫建立流程。 The GERAN or UTRAN network performs the circuit domain call setup procedure.
发明人在实现本发明的过程中发现， 在上述方案中， 如果目标网络支持 The inventor found in the process of implementing the present invention that, in the above solution, if the target network supports
PS切换但不支持双传输 (Dual Transfer Mode, DTM)模式， 则 PS业务无法和PS switching but does not support Dual Transfer Mode (DTM) mode, PS service cannot and
CS业务同时进行， 即进行 PS切换后， 在 PS业务释放之前将无法建立 CS 业务， 导致 CS业务建立的时延。 The CS service is performed at the same time, that is, after the PS handover, the CS service cannot be established before the PS service is released, resulting in the delay of the CS service establishment.
发明内容 Summary of the invention
本发明实施例提供了一种呼叫建立的方法和基站， 以保证回退到 CS域 The embodiment of the invention provides a method for establishing a call and a base station to ensure fallback to the CS domain.
(CS fallback) 机制的有效执行。 (CS fallback) Effective implementation of the mechanism.
一方面， 本发明实施例公开了一种呼叫建立的方法， 包括：  In one aspect, an embodiment of the present invention discloses a method for establishing a call, including:
纯分组交换域源网络获取由电路域承载会话类业务的目标网络的双传输 模式能力信息；  The pure packet switched domain source network acquires dual transmission mode capability information of the target network that carries the session type service by the circuit domain;
所述源网络收到电路域业务请求后， 如果所述目标网络支持分组交换域 切换和双传输模式， 则执行分组交换域切换， 在所述目标网络进行电路域呼 叫建立流程。 After the source network receives the circuit domain service request, if the target network supports the packet switched domain handover and the dual transmission mode, performing a packet switched domain handover, and performing circuit domain call on the target network. Call the establishment process.
另一方面， 本发明实施例还公开了一种呼叫建立的方法， 包括： 纯分组交换域源网络获取由电路域承载会话类业务的目标网络的双传输 模式能力信息；  On the other hand, an embodiment of the present invention further discloses a call setup method, including: a pure packet switched domain source network acquires dual transmission mode capability information of a target network that carries a session type service by a circuit domain;
所述源网络收到电路域业务请求后， 如果所述目标网络支持分组交换域 切换但不支持双传输模式， 则通过网络辅助的小区改变流程将移动终端接入 到所述目标网络小区或者由所述移动终端自主重选到所述目标网络小区， 在 所述目标网络进行电路域呼叫建立流程。  After the source network receives the circuit domain service request, if the target network supports the packet switched domain handover but does not support the dual transmission mode, the mobile terminal accesses the mobile terminal to the target network cell or by the network-assisted cell change procedure. The mobile terminal autonomously reselects to the target network cell, and performs a circuit domain call setup procedure on the target network.
再一方面， 本发明实施例还公开了一种纯分组交换域网络基站， 包括： 信息获取单元， 用于获取由电路域承载会话类业务的目标网络的双传输 模式能力信息；  In another aspect, the embodiment of the present invention further discloses a pure packet switched domain network base station, including: an information acquiring unit, configured to acquire dual transmission mode capability information of a target network that carries a session type service by a circuit domain;
接收单元， 用于接收电路域业务请求；  a receiving unit, configured to receive a circuit domain service request;
执行单元， 用于在所述接收单元接收到电路域业务请求后， 根据所述信 息获取单元获取的所述目标网络的双传输模式能力信息切换或重选到所述目 标网络小区。  And an execution unit, configured to: after the receiving unit receives the circuit domain service request, switch or reselect to the target network cell according to the dual transmission mode capability information of the target network acquired by the information acquiring unit.
通过本发明实施例的技术方案可以看出， 通过考虑目标接入网的 DTM 能力， 可以在 CS fallback机制实现过程中， 减少了 CS业务接入时延， 保持 PS域业务的连续性， 保证了 CS fallback机制的有效执行。  The technical solution of the embodiment of the present invention can be seen that, by considering the DTM capability of the target access network, the CS service access delay can be reduced and the continuity of the PS domain service can be maintained during the implementation of the CS fallback mechanism. Effective execution of the CS fallback mechanism.
附图说明 DRAWINGS
图 1为本发明方法实施例的流程示意图一；  1 is a schematic flowchart 1 of an embodiment of a method according to the present invention;
图 2为本发明方法实施例的流程示意图二；  2 is a schematic flowchart 2 of an embodiment of a method according to the present invention;
图 3为本发明方法实施例的流程示意图三；  3 is a schematic flowchart 3 of an embodiment of a method according to the present invention;
图 4为本发明方法实施例的流程示意图四；  4 is a schematic flow chart 4 of an embodiment of a method according to the present invention;
图 5为本发明方法实施例的流程示意图五；  5 is a schematic flowchart 5 of an embodiment of a method according to the present invention;
图 6为本发明基站实施例的结构示意图。  FIG. 6 is a schematic structural diagram of an embodiment of a base station according to the present invention.
具体实施方式 下面结合附图对本发明实施例做出具体的说明。 detailed description The embodiments of the present invention are specifically described below in conjunction with the accompanying drawings.
当手机在纯 PS域网络， 例如一个没有部署 IMS的 LTE网络， 发起 CS 呼叫或响应 CS寻呼时， 采用 CS fallback机制， 即先切换或重选到同覆盖的 由 CS域承载会话类业务的网络,例如， GERAN或 UTRAN网络。 下面以由 LTE网络重选到 GERAN网络为例， 结合附图具体阐述本发明的呼叫建立方 法实施例的技术方案， 如图 1所示：  When the mobile phone is in a pure PS domain network, for example, an LTE network that does not deploy IMS, when a CS call is initiated or a CS page is responded to, the CS fallback mechanism is adopted, that is, the CS domain is first switched or reselected to the CS domain to carry the session type service. Network, for example, GERAN or UTRAN network. The following is a description of the technical solution of the call setup method embodiment of the present invention, as shown in FIG. 1 by taking the LTE network reselection to the GERAN network as an example.
一、 获取目标网络， 即 GERAN网络的 DTM能力信息  1. Obtain the target network, that is, the DTM capability information of the GERAN network.
源接入网络， 例如， 演进基站 （Evolved NodeB, eNodeB) 获取目标网 络的 DTM能力信息， 可以通过以下四种方式之一：  The source access network, for example, the Evolved NodeB (eNodeB) obtains the DTM capability information of the target network in one of four ways:
a)通过无线接入网信息管理过程 （RAN Information Management , a) Through the wireless access network information management process (RAN Information Management,
RIM) 获取目标网络的 DTM能力信息。 RIM) Get DTM capability information for the target network.
在 RIM过程中， 目标接入网， 即 GERAN接入网通过核心网将包括 DTM能力信息的***信息透传到源接入网， 例如， 所述包括 DTM能力信 息的***信息可以携带在接入网传递的***消息中。 RIM流程可以作为必 要流程始终使用。  In the RIM process, the target access network, that is, the GERAN access network transparently transmits the system information including the DTM capability information to the source access network through the core network, for example, the system information including the DTM capability information may be carried in the access In the system message delivered by the network. The RIM process can always be used as a necessary process.
b)可以在需要时向目标接入网请求 DTM能力信息， 目标接入网收到请 求后向所述 eNodeB反馈其 DTM能力信息。  b) The DTM capability information may be requested from the target access network when needed, and the target access network feeds back the DTM capability information to the eNodeB after receiving the request.
c)目标接入网主动向 eNodeB提供其 DTM能力信息。  c) The target access network actively provides the eNodeB with its DTM capability information.
d)将目标接入网的 DTM能力信息配置在 eNodeB上。  d) Configure the DTM capability information of the target access network on the eNodeB.
上述四种获取目标网络的 DTM能力信息的方法仅是示例性的， 本发明 不限定获取目标网络的 DTM能力信息的具体方式， 只要是能实现获取 DTM能力信息的目的的方式， 均在本发明的保护范围之内。  The foregoing four methods for obtaining the DTM capability information of the target network are merely exemplary. The present invention does not limit the specific manner for obtaining the DTM capability information of the target network, and any manner that can achieve the purpose of acquiring the DTM capability information is in the present invention. Within the scope of protection.
二、 如果所述目标网络支持分组交换域切换和双传输模式， 则执行分组 交换域切换， 在所述目标网络进行电路域呼叫建立流程。  2. If the target network supports the packet switched domain handover and the dual transmission mode, performing a packet switched domain handover, and performing a circuit domain call setup procedure on the target network.
例如， 当演进基站收到来自移动终端的电路域呼叫请求， 即终端发起 For example, when the evolved base station receives a circuit domain call request from the mobile terminal, that is, the terminal initiates
CS主叫时， 具体流程如图 2所示： 21 ) 演进基站收到来自移动终端的 CS呼叫请求。 When CS calls, the specific process is shown in Figure 2: 21) The evolved base station receives a CS call request from the mobile terminal.
22 ) 演进基站可以请求获取一个测量报告， 以确定分组交换域切换的 GERAN目标小区， 此歩骤是可选的。  22) The evolved base station may request to acquire a measurement report to determine the GERAN target cell for the packet switched domain handover, and this step is optional.
23 ) 如果目标网络支持 PS切换和 DTM, 则演进基站执行 PS切换， 例 如， 可以通过发送重定位要求消息 （Relocation required) 发起一个到所述 23) If the target network supports PS handover and DTM, the evolved base station performs PS handover, for example, by sending a Relocation Required message (Relocation required) to initiate the
GERAN 目标小区的 PS切换。 具体 PS切换的流程可以参考 3GPP相关规 范， 此处不再详细描述。 PS handover of the GERAN target cell. For the specific PS handover procedure, refer to the relevant 3GPP specifications, which will not be described in detail here.
24) 在 GERAN目标小区建立 CS主叫语音呼叫。  24) Establish a CS calling voice call in the GERAN target cell.
当 LTE网络响应来自 GERAN网络的 CS业务寻呼请求时， 以图 3所示 流程为例描述具体过程：  When the LTE network responds to the CS service paging request from the GERAN network, the specific process is described by taking the process shown in FIG. 3 as an example:
31) GERAN网络对应的移动交换中心 MSC发送电路域寻呼请求到 LTE网络的移动性管理实体 MME, 所述 MME将此电路域寻呼请求转发给 LTE网络的演进基站。  31) The mobile switching center corresponding to the GERAN network The MSC sends a circuit domain paging request to the mobility management entity MME of the LTE network, and the MME forwards the circuit domain paging request to the evolved base station of the LTE network.
32) 所述演进基站根据来自核心网的电路域寻呼请求， 可以请求获取一 个测量报告， 以此确定 PS切换的 GERAN目标小区， 此歩骤是可选的。  32) The evolved base station may request to acquire a measurement report according to a circuit domain paging request from the core network, thereby determining a PS handover GERAN target cell, and the step is optional.
33 ) 如果目标网络支持 PS切换和 DTM, 则演进基站执行 PS切换， 例 如， 可以通过发送重定位要求消息 （Relocation required) 发起一个到所述 GERAN 目标小区的 PS切换。 具体 PS切换的流程可以参考 3GPP相关规 范， 此处不再详细描述。  33) If the target network supports PS handover and DTM, the evolved base station performs PS handover, for example, a PS handover to the GERAN target cell may be initiated by transmitting a Relocation Required message (Relocation required). For the specific PS handover procedure, refer to the relevant 3GPP specifications, which will not be described in detail here.
34) 移动终端在目标 GERAN小区建立 CS被叫语音呼叫。  34) The mobile terminal establishes a CS called voice call in the target GERAN cell.
三、 目标网络支持 PS切换但不支持 DTM, 或者， 目标网络不支持 PS 切换时， 通过网络辅助的小区改变流程将移动终端接入到所述目标网络小区 或者由所述移动终端自主重选到所述目标网络小区， 在所述目标网络进行电 路域呼叫建立流程。  3. The target network supports the PS handover but does not support the DTM. Alternatively, when the target network does not support the PS handover, the mobile terminal accesses the mobile terminal to the target network cell or is reselected by the mobile terminal by the network-assisted cell change procedure. The target network cell performs a circuit domain call setup process on the target network.
例如， 当演进基站收到来自移动终端的电路域呼叫请求， 即终端发起 For example, when the evolved base station receives a circuit domain call request from the mobile terminal, that is, the terminal initiates
CS主叫时， 通过网络辅助的小区改变流程将移动终端接入到目标网络小 区， 具体流程如图 4所示： When the CS is calling, the mobile terminal is connected to the target network through the network-assisted cell change procedure. District, the specific process is shown in Figure 4:
41 ) 演进基站收到来自移动终端的电路域呼叫请求。  41) The evolved base station receives a circuit domain call request from the mobile terminal.
42) 演进基站可以请求获取一个测量报告， 以此确定网络辅助的小区重 选的 GERAN目标小区， 此歩骤是可选的。  42) The evolved base station may request to obtain a measurement report to determine the network-assisted cell reselection of the GERAN target cell. This step is optional.
43 ) 目标网络支持 PS切换但不支持 DTM, 或者， 目标网络不支持 PS 切换时， 演进基站发送小区改变命令到移动终端， 辅助移动终端重选到目标 GERAN小区。 所述网络辅助的小区改变过程中， 可以发送加速移动终端接 入目标 GERAN小区电路域所需的信息以减少电路域呼叫建立的时延。 如果 移动终端存在 PS域业务时， 在所述目标网络首先发起电路域业务。  43) The target network supports PS handover but does not support DTM. Or, when the target network does not support PS handover, the evolved base station sends a cell change command to the mobile terminal, and the secondary mobile terminal reselects to the target GERAN cell. During the network-assisted cell change process, information required to accelerate the mobile terminal to access the target GERAN cell circuit domain may be transmitted to reduce the delay of circuit domain call setup. If the mobile terminal has a PS domain service, the circuit domain service is first initiated in the target network.
44) 在目标 GERAN小区建立 CS主叫语音呼叫。  44) Establish a CS calling voice call in the target GERAN cell.
当 LTE网络响应来自 GERAN网络的 CS业务寻呼请求时， 以图 5所示 流程为例描述具体过程：  When the LTE network responds to the CS service paging request from the GERAN network, the specific process is described by taking the process shown in FIG. 5 as an example:
51 ) GERAN 网络对应的移动交换中心 MSC发送电路域寻呼请求到 LTE网络的移动性管理实体 MME, 所述 MME将此电路域寻呼请求转发给 LTE网络的演进基站。  51) The mobile switching center MSC corresponding to the GERAN network sends a circuit domain paging request to the mobility management entity MME of the LTE network, and the MME forwards the circuit domain paging request to the evolved base station of the LTE network.
52) 所述演进基站根据来自核心网的电路域寻呼请求， 可以请求获取一 个测量报告， 以此确定网络辅助的小区重选的 GERAN目标小区， 此歩骤是 可选的。  52) The evolved base station may request to acquire a measurement report according to a circuit domain paging request from the core network, thereby determining a network-assisted cell reselected GERAN target cell, and the step is optional.
53 ) 目标网络支持 PS切换但不支持 DTM, 或者， 目标网络不支持 PS 切换时， 演进基站发送小区改变命令到移动终端， 辅助移动终端重选到目标 53) The target network supports PS handover but does not support DTM, or when the target network does not support PS handover, the evolved base station sends a cell change command to the mobile terminal, and the secondary mobile terminal reselects to the target.
GERAN小区。 所述网络辅助的小区改变过程中， 可以发送加速移动终端接 入目标 GERAN小区电路域所需的信息以减少电路域呼叫建立的时延。 如果 移动终端存在 PS域业务时， 在所述目标网络首先发起电路域业务。 GERAN community. During the network-assisted cell change process, information required to accelerate the mobile terminal to access the target GERAN cell circuit domain may be transmitted to reduce the delay of circuit domain call setup. If the mobile terminal has a PS domain service, the circuit domain service is first initiated in the target network.
54) 移动终端在目标 GERAN小区建立 CS被叫语音呼叫。  54) The mobile terminal establishes a CS called voice call in the target GERAN cell.
目标网络支持 PS切换但不支持 DTM, 或者， 目标网络不支持 PS切换 时， 也可以由所述移动终端自主重选到所述目标网络小区， 在所述目标网络 进行电路域呼叫建立流程。 The target network supports the PS handover but does not support the DTM, or the target network does not support the PS handover, and may also be reselected by the mobile terminal to the target network cell, in the target network. Perform the circuit domain call setup process.
通过以上的实施例的描述， 本领域的技术人员可以清楚地了解到本发明 可借助软件加必需的硬件平台的方式来实现， 当然也可以全部通过硬件来实 施， 但很多情况下前者是更佳的实施方式。 基于这样的理解， 本发明实施例 的技术方案对背景技术做出贡献的全部或者部分可以以软件产品的形式体现 出来， 该计算机软件产品可以存储在存储介质中， 如 ROM/RAM、 磁碟、 光盘等， 包括若干指令用以使得一台计算机设备 （可以是个人计算机， 服务 器， 或者网络设备等） 执行本发明各个实施例或者实施例的某些部分所述的 方法。  Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware, but in many cases, the former is better. Implementation. Based on such understanding, all or part of the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a disk, An optical disk or the like includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.
本发明实施例还提供了一种纯分组交换域网络基站， 如图 6所示， 包 括：  The embodiment of the invention further provides a pure packet switched domain network base station, as shown in FIG. 6, which includes:
信息获取单元 61， 用于获取由电路域承载会话类业务的目标网络的双 传输模式能力信息；  The information acquiring unit 61 is configured to acquire dual transmission mode capability information of the target network that carries the session type service by the circuit domain;
接收单元 62， 用于接收电路域业务请求；  The receiving unit 62 is configured to receive a circuit domain service request.
执行单元 63， 用于在所述接收单元接收到电路域业务请求后， 根据所 述信息获取单元获取的所述目标网络的双传输模式能力信息切换或重选到所 述目标网络小区。  The executing unit 63 is configured to switch or reselect to the target network cell according to the dual transmission mode capability information of the target network acquired by the information acquiring unit, after the receiving unit receives the circuit domain service request.
可选的， 所述基站还包括： 测量报告单元 64， 用于获取测量报告， 以 确定网络辅助的小区重选的目标小区。  Optionally, the base station further includes: a measurement reporting unit 64, configured to acquire a measurement report, to determine a target cell for network-assisted cell reselection.
所述执行单元可以包括以下模块之一或其任意组合：  The execution unit may comprise one of the following modules or any combination thereof:
第一执行模块 631， 用于当所述目标网络支持分组交换域切换和双传输 模式时， 执行分组交换域切换；  a first execution module 631, configured to perform a packet switched domain switch when the target network supports a packet switched domain handover and a dual transmission mode;
第二执行模块 632， 用于当所述目标网络不支持分组交换域切换或者支 持分组交换域切换但不支持双传输模式时， 通过网络辅助的小区改变流程将 移动终端接入到所述目标网络小区；  a second executing module 632, configured to: when the target network does not support packet switched domain switching or support packet switched domain switching but does not support dual transmission mode, accessing the mobile terminal to the target network by using a network-assisted cell change procedure Community
第三执行模块 633， 用于当所述目标网络不支持分组交换域切换或者支 持分组交换域切换但不支持双传输模式时， 触发移动终端自主重选到所述目 标网络小区。 a third execution module 633, configured to: when the target network does not support packet switched domain switching or branching When the packet switched domain handover is performed but the dual transmission mode is not supported, the mobile terminal is triggered to autonomously reselect to the target network cell.
本发明实施例提供的基站， 与网络中其它实体的交互实现过程， 与本发 明方法实施例的描述基本相同， 此处不再重复描述。  The process of implementing the interaction between the base station and the other entities in the network is basically the same as the description of the method embodiment of the present invention, and the description is not repeated here.
本发明实施例中提到的纯 PS 域网络， 包括但不限于 SAE/LTE、 A pure PS domain network mentioned in the embodiments of the present invention, including but not limited to SAE/LTE,
HSPA、 HSPA+或 WiMAX网络， 本发明实施例中提到的由 CS域承载会话 类业务的网络包括但不限于 2G或 3G网络。 The HSPA, HSPA+, or WiMAX network, the network that carries the session type service by the CS domain mentioned in the embodiment of the present invention includes but is not limited to a 2G or 3G network.
通过本发明各实施例可以看出， 通过获取目标接入网的 DTM能力， 可 以对采用何种 CS fallback机制进行正确判决， 例如， 如果目标网络支持 PS 切换但不支持 DTM, 则通过 NACC流程将移动终端接入到所述目标网络小 区或者由所述移动终端自主重选到所述目标网络小区， 从而避免执行 PS切 换后， 因为不支持 DTM而要先将 PS业务释放再建立 CS业务， 从而减少了 CS业务接入时延； 如果目标网络支持 PS切换和 DTM, 则执行 PS切换， 进行 CS呼叫建立流程， 从而也兼顾到了 PS域业务的连续性； 保证了 CS fallback机制的有效执行。  Through the embodiments of the present invention, it can be seen that by obtaining the DTM capability of the target access network, the CS fallback mechanism can be correctly determined. For example, if the target network supports the PS handover but does not support the DTM, the NACC process is adopted. The mobile terminal accesses the target network cell or is autonomously reselected by the mobile terminal to the target network cell, so as to avoid releasing the PS service and then establishing the CS service, because the DTM is not supported, The CS service access delay is reduced. If the target network supports the PS handover and the DTM, the PS handover is performed to perform the CS call setup process, thereby taking into account the continuity of the PS domain service; and ensuring the effective execution of the CS fallback mechanism.
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。  It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

权利要求书 Claim
1、 一种呼叫建立的方法， 其特征在于， 所述方法包括：  A method for establishing a call, the method comprising:
纯分组交换域源网络获取由电路域承载会话类业务的目标网络的双传输 模式能力信息；  The pure packet switched domain source network acquires dual transmission mode capability information of the target network that carries the session type service by the circuit domain;
所述源网络收到电路域业务请求后， 如果所述目标网络支持分组交换域 切换和双传输模式， 则执行分组交换域切换， 在所述目标网络进行电路域呼 叫建立流程； 如果所述目标网络支持分组交换域切换但不支持双传输模式， 则通过网络辅助的小区改变流程将移动终端接入到所述目标网络小区或者由 所述移动终端自主重选到所述目标网络小区， 在所述目标网络进行电路域呼 叫建立流程。  After the source network receives the circuit domain service request, if the target network supports the packet switched domain handover and the dual transmission mode, performing a packet switched domain handover, and performing a circuit domain call setup procedure on the target network; If the network supports the packet switched domain handover but does not support the dual transmission mode, the mobile terminal accesses the mobile terminal to the target network cell or is autonomously reselected by the mobile terminal to the target network cell by using a network-assisted cell change procedure. The target network performs a circuit domain call setup process.
2、 如权利要求 1所述的方法， 其特征在于， 所述获取目标网络的双传 输模式能力信息包括：  2. The method according to claim 1, wherein the acquiring the dual transmission mode capability information of the target network comprises:
通过无线接入网信息管理过程获取所述目标网络的双传输模式能力信 息； 或者  Obtaining dual transmission mode capability information of the target network by using a radio access network information management process; or
向所述目标网络请求双传输模式能力信息， 所述目标网络收到请求后反 馈其双传输模式能力信息； 或者  Requesting, by the target network, dual transmission mode capability information, where the target network feeds back its dual transmission mode capability information after receiving the request; or
所述目标网络主动提供其双传输模式能力信息； 或者  The target network actively provides its dual transmission mode capability information; or
将所述目标网络的双传输模式能力信息配置在所述源网络上。  The dual transmission mode capability information of the target network is configured on the source network.
3、 如权利要求 1所述的方法， 其特征在于， 所述源网络收到的电路域 业务请求包括：  3. The method according to claim 1, wherein the circuit domain service request received by the source network comprises:
来自所述移动终端的电路域呼叫请求或者来自所述目标网络的电路域寻 呼请求。  A circuit domain call request from the mobile terminal or a circuit domain hop request from the target network.
4、 如权利要求 1所述的方法， 其特征在于， 在所述网络辅助的小区改 变流程中， 发送加速接入目标网络小区电路域所需信息给所述移动终端。  The method according to claim 1, wherein in the network-assisted cell change procedure, information required to accelerate access to the target network cell circuit domain is sent to the mobile terminal.
5、 如权利要求 1所述的方法， 其特征在于， 如果所述移动终端存在分 组交换域业务， 通过所述网络辅助的小区改变流程将所述移动终端接入到所 述目标网络小区后， 在所述目标网络小区首先发起电路域业务。 5. The method according to claim 1, wherein if the mobile terminal has a packet switched domain service, the mobile terminal is accessed by the network assisted cell change procedure. After the target network cell is described, the circuit domain service is first initiated in the target network cell.
6、 一种纯分组交换域网络基站， 其特征在于， 所述基站包括： 信息获取单元， 用于获取由电路域承载会话类业务的目标网络的双传输 模式能力信息；  A base station of a pure packet switched domain network, the base station includes: an information acquiring unit, configured to acquire dual transmission mode capability information of a target network that carries a session type service by a circuit domain;
接收单元， 用于接收电路域业务请求；  a receiving unit, configured to receive a circuit domain service request;
执行单元， 用于在所述接收单元接收到电路域业务请求后， 根据所述信 息获取单元获取的所述目标网络的双传输模式能力信息切换或重选到所述目 标网络小区。  And an execution unit, configured to: after the receiving unit receives the circuit domain service request, switch or reselect to the target network cell according to the dual transmission mode capability information of the target network acquired by the information acquiring unit.
7、 如权利要求 6所述的基站， 其特征在于， 所述基站还包括： 测量报告单元， 用于获取测量报告。  The base station according to claim 6, wherein the base station further comprises: a measurement reporting unit, configured to acquire a measurement report.
8、 如权利要求 6所述的基站， 其特征在于， 所述执行单元包括以下模 块之一或其任意组合：  8. The base station according to claim 6, wherein the execution unit comprises one of the following modules or any combination thereof:
第一执行模块， 用于当所述目标网络支持分组交换域切换和双传输模式 时， 执行分组交换域切换；  a first execution module, configured to perform a packet switched domain switch when the target network supports a packet switched domain handover and a dual transmission mode;
第二执行模块， 用于当所述目标网络不支持分组交换域切换或者支持分 组交换域切换但不支持双传输模式时， 通过网络辅助的小区改变流程将移动 终端接入到所述目标网络小区；  a second execution module, configured to: when the target network does not support packet switched domain handover or support packet switched domain handover but does not support dual transmission mode, access the mobile terminal to the target network cell by using a network-assisted cell change procedure ;
第三执行模块， 用于当所述目标网络不支持分组交换域切换或者支持分 组交换域切换但不支持双传输模式时， 触发移动终端自主重选到所述目标网 络小区。  And a third executing module, configured to trigger the mobile terminal to autonomously reselect to the target network cell when the target network does not support packet switched domain switching or supports packet switching domain switching but does not support dual transmission mode.
PCT/CN2009/071031 2008-04-03 2009-03-26 A method and a base station for call set-up WO2009121282A1 (en)

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