CN101321375A - Method and server for controlling conversation switch - Google Patents

Abstract

Translated fromChinese

本发明公开了一种控制会话切换的方法和服务器，属于通信领域。所述方法包括：收集网络接口的会话信息；接收所述网络接口和/或空闲网络接口的切换相关信息；根据所述切换相关信息判断是否满足切换预备条件，若是，则根据所收集的会话信息为会话切换预留资源；根据所述切换相关信息判断是否满足切换条件，若是，则控制会话在所述网络接口和/或空闲网络接口间切换，控制切换后的会话使用所述预留资源。所述服务器包括：会话信息收集模块、接收模块、切换预备模块和会话切换控制模块。本发明通过在会话切换前作准备条件，当会话切换时，直接利用预先的准备进行会话切换，实现更优的无缝切换，降低延迟时间，提高会话切换的效率。

The invention discloses a method and server for controlling session switching, which belong to the communication field. The method includes: collecting session information of the network interface; receiving handover related information of the network interface and/or idle network interface; judging whether the handover precondition is satisfied according to the handover related information, and if so, according to the collected session information Reserving resources for session switching; judging whether switching conditions are met according to the switching related information, if so, controlling session switching between the network interface and/or idle network interface, and controlling the switched session to use the reserved resources. The server includes: a session information collection module, a receiving module, a switching preparation module and a session switching control module. The invention prepares the preparatory conditions before the session switching, and directly utilizes the pre-preparation to perform the session switching when the session is switching, so as to realize better seamless switching, reduce the delay time, and improve the efficiency of the session switching.

Description

Translated fromChinese

控制会话切换的方法和服务器Method and server for controlling session switching

技术领域technical field

本发明涉及通信领域，特别涉及控制会话切换的方法和服务器。The invention relates to the communication field, in particular to a method and server for controlling session switching.

背景技术Background technique

随着通信网络的迅速发展及IP与通信的结合，未来通信系统网络将包括各种异构接入技术和异构网络的全IP网络，异构的网络接口包括GSM(Global System of MobileCommunication，全球移动通信系统)、GPRS(General Packet Radio Service，通用无线分组业务)、WCDMA(Wideband Code Division Multiple Access，宽带分码多工存取)、CDMA2000、TD-SCDMA、B3G/4G空中接口、IEEE 802系列无线网络接口、自组织网络(Ad Hoc)接口，以及卫星和Internet、PSTN(Public Switched Telephon Network，公共交换电话网)、ADSL(Asymmetric Digital Subscriber Line，非对称数字用户线路)等网络接口，而异构网络的覆盖区域往往会互相重叠，为实现用户业务的连续性和服务无所不在性，需要有一个完善的链路层切换技术。IEEE 802.21为了解决该问题，制定出能够向高层提供链路层智能的标准，标准在网络层和数据链路层之间引入一个MIH(Media Independent Handover，媒体独立切换)层，通过与低层异构介质间的作用和与对等MIH层通信来屏蔽介质异构性，使低层网络的异构对高层透明，并提供元语，用于制定切换机制。With the rapid development of communication networks and the combination of IP and communication, the future communication system network will include all IP networks of various heterogeneous access technologies and heterogeneous networks. The heterogeneous network interfaces include GSM (Global System of Mobile Communication, global Mobile communication system), GPRS (General Packet Radio Service, general wireless packet service), WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access), CDMA2000, TD-SCDMA, B3G/4G air interface, IEEE 802 series Wireless network interface, self-organizing network (Ad Hoc) interface, and network interfaces such as satellite and Internet, PSTN (Public Switched Telephon Network, public switched telephone network), ADSL (Asymmetric Digital Subscriber Line, asymmetric digital subscriber line), etc. The coverage areas of the structured network often overlap with each other. In order to realize the continuity of user services and the ubiquity of services, a complete link layer switching technology is required. In order to solve this problem, IEEE 802.21 has formulated a standard that can provide link layer intelligence to the upper layer. The standard introduces an MIH (Media Independent Handover) layer between the network layer and the data link layer. The role of the medium and the communication with the peer MIH layer shield the heterogeneity of the medium, make the heterogeneity of the low-level network transparent to the high-level, and provide primitives for formulating the switching mechanism.

在实现本发明的过程中，发明人发现目前由于多种异构的接入网络各有特点，例如认证机制、带宽、移动性管理机制、QoS(Quality ofService，服务质量)机制等，会话切换的条件比较复杂，使得会话在不同接口间切换的时间比较长。In the process of realizing the present invention, the inventor found that due to various heterogeneous access networks having their own characteristics, such as authentication mechanism, bandwidth, mobility management mechanism, QoS (Quality of Service, quality of service) mechanism, etc., session handover The conditions are more complicated, which makes it take a long time for the session to switch between different interfaces.

发明内容Contents of the invention

为了缩短会话切换的时间，本发明实施例提供了一种控制会话切换的方法和服务器。所述技术方案如下：In order to shorten the time of session switching, the embodiment of the present invention provides a method and server for controlling session switching. Described technical scheme is as follows:

一种控制会话切换的方法，所述方法包括：A method for controlling session switching, the method comprising:

收集网络接口的会话信息；Collect session information for network interfaces;

接收所述网络接口和/或空闲网络接口的切换相关信息；receiving handover related information of the network interface and/or idle network interface;

根据所述切换相关信息判断是否满足切换预备条件，若是，则根据所收集的会话信息为会话切换预留资源；judging whether the handover precondition is met according to the handover related information, and if so, reserving resources for the session handover according to the collected session information;

根据所述切换相关信息判断是否满足切换条件，若是，则控制会话在所述网络接口和/或空闲网络接口间切换，控制切换后的会话使用所述预留资源。Judging whether a switching condition is met according to the handover related information, and if so, controlling the session to be switched between the network interface and/or the idle network interface, and controlling the switched session to use the reserved resource.

进一步地，本发明实施例还提供了一种服务器，所述服务器包括：Further, an embodiment of the present invention also provides a server, and the server includes:

会话信息收集模块，用于收集网络接口的会话信息；The session information collection module is used to collect the session information of the network interface;

接收模块，用于接收所述网络接口和/或空闲网络接口的切换相关信息；A receiving module, configured to receive switching-related information of the network interface and/or idle network interface;

切换预备模块，用于当所述接收模块中接收的切换相关信息满足切换预备条件时，根据所收集的会话信息通知网络中相应的网络设备为会话切换预留资源；A handover preparation module, configured to notify corresponding network devices in the network to reserve resources for session handover according to the collected session information when the handover related information received in the receiving module satisfies handover preparation conditions;

会话切换控制模块，用于当所述接收模块中接收的切换相关信息满足切换条件时，控制会话在所述网络接口和/或空闲网络接口间切换，控制切换后的会话使用所述预留资源。A session switching control module, configured to control the switching of the session between the network interface and/or the idle network interface when the switching related information received in the receiving module satisfies the switching condition, and control the switched session to use the reserved resource .

本发明实施例在网络上设置一个控制会话切换的服务器，在会话切换前通过该服务器作资源预留准备工作，当会话切换时，直接利用预先准备的资源进行会话切换，可以实现更优的无缝切换，降低延迟时间，提高会话切换的效率。In the embodiment of the present invention, a server for controlling session switching is set up on the network, and resource reservation preparations are made through the server before session switching. Seamless switching, reducing the delay time, and improving the efficiency of session switching.

附图说明Description of drawings

图1是本发明实施例1提供的业务在不同终端间切换的示意图；FIG. 1 is a schematic diagram of service switching between different terminals provided byEmbodiment 1 of the present invention;

图2是本发明实施例1提供的业务在不同终端间切换的另一种示意图；FIG. 2 is another schematic diagram of service switching between different terminals provided byEmbodiment 1 of the present invention;

图3是本发明实施例1提供的业务在同一终端的不同模式的网络接口间切换的示意图；FIG. 3 is a schematic diagram of service switching between network interfaces of different modes of the same terminal provided byEmbodiment 1 of the present invention;

图4是本发明实施例1提供的控制会话切换的方法流程图；FIG. 4 is a flowchart of a method for controlling session switching provided byEmbodiment 1 of the present invention;

图5是本发明实施例2提供的基于Internet应用的网络结构图；FIG. 5 is a network structure diagram based on Internet applications provided by Embodiment 2 of the present invention;

图6是本发明实施例2提供的控制会话切换的信息交互图；FIG. 6 is an information interaction diagram for controlling session switching provided by Embodiment 2 of the present invention;

图7是本发明实施例2提供的另一种控制会话切换的信息交互图；FIG. 7 is another information interaction diagram for controlling session switching provided by Embodiment 2 of the present invention;

图8是本发明实施例3提供的基于IMS网络的会话移动性控制结构图；FIG. 8 is a structural diagram of session mobility control based on an IMS network provided by Embodiment 3 of the present invention;

图9是本发明实施例3提供的控制会话切换的信息交互图；FIG. 9 is an information interaction diagram for controlling session switching provided by Embodiment 3 of the present invention;

图10是本发明实施例3提供的另一种控制会话切换的信息交互图；FIG. 10 is another information interaction diagram for controlling session switching provided by Embodiment 3 of the present invention;

图11是本发明实施例4提供的服务器结构图。FIG. 11 is a structural diagram of a server provided by Embodiment 4 of the present invention.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

本发明实施例通过会话切换前作准备条件，当进行会话切换时，直接利用准备的条件进行切换，缩短了会话切换的时间。In the embodiment of the present invention, preparatory conditions are prepared before session switching, and when session switching is performed, the prepared conditions are directly used for switching, thereby shortening the time for session switching.

实施例1Example 1

本实施例提供了一种控制会话切换的方法，会话在不同接口间切换可能有3种情况：This embodiment provides a method for controlling session switching. There may be three situations in which a session is switched between different interfaces:

参见图1，业务在2个不同终端间切换，2个终端拥有自己的SIM卡；Referring to Figure 1, the service is switched between two different terminals, and the two terminals have their own SIM cards;

参见图2，业务在2个不同终端间切换，2个终端共享1个SIM卡；Referring to Figure 2, the service is switched between two different terminals, and the two terminals share one SIM card;

参见图3，多模终端，业务在同一终端的2个不同模式的接口间切换。Referring to FIG. 3 , a multi-mode terminal, services are switched between two interfaces of different modes on the same terminal.

该控制会话切换的方法包括：The method for controlling session switching includes:

收集网络接口的会话信息；接收网络接口和/或空闲网络接口的切换相关信息；Collect session information for network interfaces; receive switching related information for network interfaces and/or idle network interfaces;

根据切换相关信息判断是否满足切换预备条件，若是，则根据所收集的会话信息为会话切换预留资源；根据切换相关信息判断是否满足切换条件，若是，则控制会话在网络接口和/或空闲网络接口间切换，控制切换后的会话使用预留资源。Judging whether the handover preparation condition is met according to the handover related information, if so, then reserve resources for the session handover according to the collected session information; judge whether the handover condition is met according to the handover related information, if so, control the session on the network interface and/or idle network Switch between interfaces, and control the use of reserved resources for sessions after switching.

这里的切换相关信息包括：网络接口和/或空闲网络接口发送的成功设置切换预备条件和切换条件的通知消息，设置的切换预备条件和切换条件对应的事件等。The handover-related information here includes: a notification message sent by the network interface and/or an idle network interface that the handover preparation condition and the handover condition are successfully set, events corresponding to the set handover preparation condition and the handover condition, and the like.

实现上述方法时，首先在网络中增加一个控制会话切换的服务器，本实施例具体为会话移动性管理服务器SMM-SERVER(SMM，Session Mobility Management)，参见图4，该会话切换方法具体包括以下步骤：When realizing above-mentioned method, at first in network, increase the server of a control session switching, present embodiment is specifically session mobility management server SMM-SERVER (SMM, Session Mobility Management), referring to Fig. 4, this session switching method specifically comprises the following steps :

步骤101：终端开机上线后，在SMM-SERVER中注册自己已经在线。Step 101: After the terminal is powered on and online, register itself in the SMM-SERVER as already online.

步骤102：当终端发起会话时，SMM-SERVER通过网络收集此次会话的信息，会话的信息包括会话本身信息，例如会话标识或寻址等，还包括会话两端协商的SDP(Session DescribeProtocol，会话描述协议)信息，例如媒体组合方式、传输协议或端口号等。Step 102: When the terminal initiates a session, the SMM-SERVER collects the information of this session through the network. The information of the session includes the session itself information, such as session identification or addressing, etc., and also includes the SDP (Session Describe Protocol, session Describe the protocol) information, such as media combination mode, transmission protocol or port number, etc.

步骤103：SMM-SERVER向终端订阅需要的信息及数据，即订阅会话切换预备条件和切换条件。Step 103: The SMM-SERVER subscribes to the terminal for required information and data, that is, subscribes to session handover preconditions and handover conditions.

这里的订阅具体以发请求的方式订阅需要的信息及数据，终端将请求转发给订阅的目的网络接口，目的网络接口可以是本网络接口，也可以是闲置的网络接口或当前会话的网络接口，也可以向闲置的网络接口和当前会话的网络接口同时订阅。例如双模终端，服务器也可以向没有进行会话的模式订阅信息，此时，需要当前会话的网络接口来传递订阅需要的信息及数据。本实施例采用向当前会话的网络接口订阅。The subscription here specifically subscribes to the required information and data by sending a request, and the terminal forwards the request to the destination network interface of the subscription. The destination network interface can be the current network interface, an idle network interface or the network interface of the current session. It is also possible to subscribe to an idle network interface and the network interface of the current session at the same time. For example, a dual-mode terminal, the server can also subscribe information to a mode without a session. At this time, the network interface of the current session is needed to transmit the information and data required for subscription. In this embodiment, subscription is made to the network interface of the current session.

SMM-SERVER订阅的切换预备条件和切换条件是两个不同的阀值，这个阀值可以是当前接口的信号强度阀值、预设的网络带宽阀值、预设的服务质量阀值、预设的网络性价比阀值或预设的服务能力阀值等，或者新接口检测到更好信号质量的网络，并且比原来信号好到一个程度，或者新接口发现一个网络满足用户的喜好设置，或者以上因素的任意组合。当然切换条件的阀值程度要高于切换预备条件的阀值。The switching preconditions and switching conditions of SMM-SERVER subscription are two different thresholds. This threshold can be the signal strength threshold of the current interface, the preset network bandwidth threshold, the preset quality of service threshold, the preset The threshold value of the network cost performance or the preset service capability threshold, etc., or the new interface detects a network with better signal quality, and the signal is better than the original signal to a certain extent, or the new interface finds a network that meets the user's preferences, or above any combination of factors. Certainly, the threshold value of the switching condition is higher than the threshold value of the switching precondition.

SMM-SERVER订阅的信息可以是MIH信息，即802.21的媒体独立切换的信息，或者订阅接入设备或网关的广播信息，触发各个业务逻辑的阀值信息等。The information subscribed by SMM-SERVER can be MIH information, that is, 802.21 media independent switching information, or subscribe to broadcast information of access devices or gateways, trigger threshold information of various business logics, etc.

举例说明，本实施例SMM-SERVER订阅的信息为信号强度的MIH link-going-down(正在连接的信号强度下降信号)、MIH link-down(连接中断信号)或MIH link-up(连接开始信号)信息。For example, the information subscribed by the SMM-SERVER in this embodiment is MIH link-going-down (signal strength drop signal being connected), MIH link-down (connection interruption signal) or MIH link-up (connection start signal) of signal strength. )information.

订阅通知的机制，切换控制通过SMM-SERVER向MIH层订阅信息来完成切换准备、切换的触发，进而做相应的操作。The mechanism of subscription notification, handover control through SMM-SERVER subscribes information to MIH layer to complete handover preparation, handover trigger, and then perform corresponding operations.

这个订阅过程可以由MIH层负责，利用MIH本身的机制，即：由MIH层负责发送订阅消息及接收通知消息，然后触发应用层操作；也可以由应用层直接发送订阅消息及接收通知消息，即：通过应用层封装MIH信息的方式传输；也可以将MIH信息映射成应用层协议参数，通过扩展应用层协议的方式传输。或者以上方式的任意组合。The subscription process can be handled by the MIH layer, using the mechanism of the MIH itself, that is: the MIH layer is responsible for sending the subscription message and receiving the notification message, and then triggering the operation of the application layer; or the application layer can directly send the subscription message and receive the notification message, that is : Transmission by encapsulating MIH information at the application layer; MIH information can also be mapped to application layer protocol parameters and transmitted by extending the application layer protocol. Or any combination of the above methods.

步骤104：终端通过检测判断是否满足会话切换预备条件，如果满足，执行步骤105；否则，执行步骤112，继续原来的会话。该检测可以由终端中正在会话的网络接口完成，也可以由闲置的网络接口完成，主要由订阅过程决定，SMM-SERVER向哪个网络接口订阅的会话切换预备条件，就由哪个接口来进行检测。所以本实施例由当前正在会话的网络接口进行检测。Step 104: The terminal judges whether the preconditions for session handover are satisfied through detection, and if so, executesstep 105; otherwise, executesstep 112 to continue the original session. The detection can be completed by the network interface in the session in the terminal, or it can be completed by the idle network interface. It is mainly determined by the subscription process. Which network interface the SMM-SERVER subscribes to for the session switching preconditions, which interface will perform the detection. Therefore, in this embodiment, detection is performed by the network interface currently in session.

会话切换预备条件指的是网络状况发生变化，并且该变化中的信息被SMM-SERVER预先订阅。The session handover precondition means that the network status changes, and the information in the change is pre-subscribed by the SMM-SERVER.

步骤105：终端通知SMM-SERVER到达了会话切换预备条件。Step 105: The terminal notifies the SMM-SERVER that the precondition for session handover has been reached.

该通知可以由终端中正在会话的网络接口完成，也可以由闲置的网络接口完成，主要由步骤104中的检测过程决定，如果步骤104中的检测由正在会话的网络接口进行，则此通知也由该接口进行；如果步骤104中的检测由闲置的网络接口进行，则此通知由该闲置的网络接口进行。所以本实施例由当前正在会话的网络接口进行通知。This notification can be completed by the network interface in session in the terminal, or by an idle network interface, mainly determined by the detection process instep 104, if the detection instep 104 is performed by the network interface in session, then this notification is also By this interface; if the detection instep 104 is by an idle network interface, this notification is by this idle network interface. So this embodiment is notified by the network interface currently in session.

步骤106：SMM-SERVER收到通知后，发起切换准备工作，即通知相应的网络设备预留资源。这里的网络设备包括接入设备或网关等。Step 106: After receiving the notification, the SMM-SERVER initiates handover preparation, that is, notifies the corresponding network equipment to reserve resources. The network devices here include access devices or gateways.

SMM-SERVER将综合考虑步骤102中所收集的会话信息，以及用户喜好信息和运营商配置的信息，预测接下来一段时间后会发生切换，于是在网络侧为这个会话切换预先做准备工作，以降低切换的延迟。例如，可以提前做资源预留的准备。SMM-SERVER will comprehensively consider the session information collected instep 102, as well as user preference information and operator configuration information, and predict that a handover will occur in the next period of time, so the network side will make preparations for this session handover in advance, so as to Reduce switching latency. For example, preparations for resource reservation may be made in advance.

本实施例中的步骤104至步骤106的具体实现过程为：The specific implementation process ofstep 104 to step 106 in this embodiment is:

首先终端的接口检测到网络的状况发生变化，例如发生了MIH link-going-down信息，因为SMM-SERVER已经向终端订阅了该信息，则终端通知SMM-SERVER，即将该信息发送到SMM-SERVER；First, the interface of the terminal detects that the status of the network has changed, for example, MIH link-going-down information has occurred, because the SMM-SERVER has subscribed to the information from the terminal, the terminal will notify the SMM-SERVER, and send the information to the SMM-SERVER ;

若订阅信息的过程由MIH层负责，当该信息通知到SMM-SERVER后，由SMM-SERVER的MIH层负责通知应用层，触发相应的预先准备切换动作；若由SMM-SERVER的应用层直接向终端的应用层通过应用层协议订阅了这个信息，则该信息的订阅、通知过程可以由应用层封装MIH信息来完成，也可以通过将MIH元语映射成应用层协议的参数，通过扩展应用层协议完成。If the MIH layer is responsible for the process of subscribing information, when the information is notified to SMM-SERVER, the MIH layer of SMM-SERVER is responsible for notifying the application layer and triggering the corresponding pre-preparation switching action; if the application layer of SMM-SERVER directly sends The application layer of the terminal subscribes to this information through the application layer protocol, then the information subscription and notification process can be completed by the application layer encapsulating the MIH information, or by mapping the MIH primitive language into the parameters of the application layer protocol, and extending the application layer The agreement is complete.

本实施例的订阅过程以MIH层进行订阅为例进行说明。The subscription process of this embodiment is described by taking the MIH layer to subscribe as an example.

步骤107：终端检测是否满足会话切换条件，如果是，执行步骤108；否则，执行步骤111。Step 107: The terminal detects whether the session switching condition is met, and if yes, executesstep 108; otherwise, executesstep 111.

该检测可以由终端中正在会话的网络接口完成，也可以由闲置的网络接口完成，主要由步骤104中的检测过程决定，如果步骤104中的检测由正在会话的网络接口进行，则此步骤中的检测也由该接口进行；如果步骤104中的检测由闲置的网络接口进行，则此步骤中的检测由该闲置的网络接口进行。所以本实施例由当前正在会话的网络接口进行检测。This detection can be completed by the network interface in session in the terminal, and can also be completed by an idle network interface, mainly determined by the detection process instep 104, if the detection instep 104 is performed by the network interface in session, then in this step The detection of is also performed by this interface; if the detection instep 104 is performed by an idle network interface, then the detection in this step is performed by this idle network interface. Therefore, in this embodiment, detection is performed by the network interface currently in session.

通常根据具体情况设定一个老化时间T秒，如果经过了T秒，仍然不满足会话切换条件，则认为不需要进行会话切换，通知MIH event-rollback消息给SMM-SERVER，要求SMM-SERVER进行状态回滚。如果T秒内检测到网络状况变化达到SMM-SERVER订阅的会话切换触发条件，则通知SMM-SERVER进行会话切换。Usually, an aging time T seconds is set according to the specific situation. If the session switching condition is still not satisfied after T seconds, it is considered that there is no need for session switching, and the MIH event-rollback message is notified to SMM-SERVER, requiring SMM-SERVER to perform status rollback. If it is detected within T seconds that the change in the network status meets the session switching trigger condition subscribed by the SMM-SERVER, the SMM-SERVER will be notified to perform session switching.

本实施例中的网络状况变化具体为MIH link-down或MIH link-up信息，将MIH link-down或MIH link-up信息发送到SMM-SERVER。因为本实施例的订阅过程为MIH层进行订阅的，所以当上述信息通知到SMM-SERVER后，由SMM-SERVER的MIH层负责通知应用层，触发相应的准备动作；The network status change in this embodiment is specifically MIH link-down or MIH link-up information, and the MIH link-down or MIH link-up information is sent to the SMM-SERVER. Because the subscription process of this embodiment is subscribed by the MIH layer, so when the above information is notified to the SMM-SERVER, the MIH layer of the SMM-SERVER is responsible for notifying the application layer and triggering corresponding preparation actions;

如果订阅上述信息的过程由SMM-SERVER的应用层直接向终端的应用层通过应用层协议订阅的，则此时的通知过程可以由应用层封装MIH信息来完成，或者通过将MIH元语映射成应用层协议的参数，通过扩展应用层协议来完成。If the process of subscribing to the above information is directly subscribed by the application layer of the SMM-SERVER to the application layer of the terminal through the application layer protocol, the notification process at this time can be completed by the application layer encapsulating the MIH information, or by mapping the MIH primitive into The parameters of the application layer protocol are completed by extending the application layer protocol.

步骤108：终端通知SMM-SERVER到达了会话切换条件。Step 108: the terminal notifies the SMM-SERVER that the session switching condition has been reached.

该通知可以由终端中正在会话的网络接口完成，也可以由闲置的网络接口完成，主要由步骤104中的检测过程决定，如果步骤104中的检测由正在会话的网络接口进行，则此通知也由该接口进行；如果步骤104中的检测由闲置的网络接口进行，则此通知由该闲置的网络接口进行。所以本实施例由当前正在会话的网络接口进行通知。This notification can be completed by the network interface in session in the terminal, or by an idle network interface, mainly determined by the detection process instep 104, if the detection instep 104 is performed by the network interface in session, then this notification is also By this interface; if the detection instep 104 is by an idle network interface, this notification is by this idle network interface. So this embodiment is notified by the network interface currently in session.

步骤109：SMM-SERVER收到通知后，发起并控制会话切换，通知相应的网络设备使用已经预留的资源。Step 109: After receiving the notification, the SMM-SERVER initiates and controls the session switching, and notifies the corresponding network equipment to use the reserved resources.

步骤110：会话切换完成后断开原来的会话，并通知相应的网络设备释放原来会话占用的资源。Step 110: Disconnect the original session after the session switching is completed, and notify the corresponding network device to release the resources occupied by the original session.

步骤111：退回到切换准备工作之前的状态，例如，通知相应的网络设备将预留的资源释放。Step 111: return to the state before the handover preparation, for example, notify the corresponding network equipment to release the reserved resources.

步骤112：继续原来的会话。Step 112: Continue the original session.

实施例2Example 2

本实施例提供另一种控制会话切换的方法，下面以基于Internet应用为例，移动终端使用Internet服务时，可能从一个AP(Access Point，接入点)切换到另一个AP，或者从一个AR(Access Router，接入路由器)切换到另一个AR。如果只发生2层(链路层)切换时，可能需要发起新的资源预留过程；如果只发生3层(网络层)切换，如果使用移动IP，IP变化对会话是透明的，如果不使用移动IP，则会话寻址需要变化；如果同时发生2层、3层切换，则可能需要发起新的资源预留过程，如果使用移动IP，则IP的变化对会话是透明的，如果不使用移动IP，则会话寻址需要变化。This embodiment provides another method for controlling session switching. Taking Internet-based applications as an example below, when a mobile terminal uses Internet services, it may switch from one AP (Access Point, access point) to another AP, or from an AR (Access Router, access router) switches to another AR. If only layer 2 (link layer) switching occurs, a new resource reservation process may need to be initiated; if only layer 3 (network layer) switching occurs, if mobile IP is used, the IP change is transparent to the session, if not used For mobile IP, session addressing needs to be changed; if layer 2 and layer 3 handovers occur at the same time, a new resource reservation process may need to be initiated. If mobile IP is used, the change of IP is transparent to the session. If mobile IP is not used IP, the session addressing needs to change.

可以通过在网络上加入一个SMM-SERVER来控制会话在以上情况下的切换过程，参见图5，为基于Internet应用的网络结构图，SMM-SERVER与网络相连，通过网络与接入设备相连，接入点主要是信息的入口，使得用户可以修改自己的用户喜好的设置，图中有两个接入网，分别为接入网1和接入网2，会话将从接口2切换到接口1，由接口1与通信对端会话。其中，应用层可以是HTTP(HyperTextTransportProtocol，超级文本传送协议)，RTSP(RealTime Streaming Protocol，实时流协议)，FTP(File Transport Protocol，文件传输协议)等应用层协议；传输层可以是TCP(Transport Control Protocol传输控制协议)，UDP(User DataProtocol，用户数据协议)，RTP(Real-time Transport Protocol，实时传输协议)等传输层协议。You can control the switching process of the session in the above cases by adding an SMM-SERVER to the network. See Figure 5, which is a network structure diagram based on Internet applications. The SMM-SERVER is connected to the network and connected to the access device through the network. The entry point is mainly the entrance of information, so that users can modify the settings of their own user preferences. There are two access networks in the figure, namely accessnetwork 1 and access network 2. The session will be switched from interface 2 tointerface 1. Conversation with the communication peer throughinterface 1. Among them, the application layer can be HTTP (HyperTextTransportProtocol, hypertext transfer protocol), RTSP (RealTime Streaming Protocol, real-time streaming protocol), FTP (File Transport Protocol, file transfer protocol) and other application layer protocols; the transport layer can be TCP (Transport Control Protocol Transmission Control Protocol), UDP (User Data Protocol, User Data Protocol), RTP (Real-time Transport Protocol, Real-time Transport Protocol) and other transport layer protocols.

以图5提供的网络结构为例，参见图6和图7，具体的控制会话切换的方法步骤如下：Taking the network structure provided in Figure 5 as an example, referring to Figures 6 and 7, the specific method steps for controlling session switching are as follows:

步骤201：接口2与通信对端进行会话。Step 201: Interface 2 conducts a session with the communication peer.

步骤202：SMM-SERVER在这次会话发起的过程中通过接收并转发建立会话信令的方式收集这次会话的信息，包括会话标识，会话寻址信息，会话SDP等信息。Step 202: During the session initiation process, the SMM-SERVER collects session information by receiving and forwarding session establishment signaling, including session identifier, session addressing information, session SDP and other information.

步骤203：SMM-SERVER向接口2发送订阅网络检测事件的请求。Step 203: The SMM-SERVER sends a request to interface 2 for subscribing to network detection events.

具体可以直接向接口2发送订阅网络检测事件的请求，也可以通过接口2向接口1发送订阅网络检测事件的请求，或同时向接口1和接口发送订阅网络检测事件的请求。本实施例采用通过接口2向接口1发送订阅网络检测事件的请求为例进行说明。因为是向接口1订阅的网络检测事件，所以后面的检测、通知将由接口1完成；否则，由接口2完成。Specifically, a request for subscribing to a network detection event may be directly sent to interface 2, or a request for subscribing to a network detection event may be sent tointerface 1 through interface 2, or a request for subscribing to a network detection event may be sent to bothinterface 1 and the interface at the same time. In this embodiment, a request for subscribing to a network detection event is sent to interface 1 through interface 2 as an example for illustration. Because it is a network detection event subscribed tointerface 1, subsequent detection and notification will be completed byinterface 1; otherwise, it will be completed by interface 2.

SMM-SERVER先将MIH信息描述成XML(EXtensible Markup Language，可扩展置标语言)的形式，通过应用层协议封装这些信息的方式来订阅。SMM-SERVER也可以通过扩展应用层协议的方式传递订阅网络检测事件的请求信息；或者通过两个实体的MIH层间本身的注册订阅的机制订阅检测网络的事件，当收到订阅检测网络事件的请求时，通过MIH层将通知发送到SMM-SERVER的MIH信息处理模块，然后由SMM-SERVER的MIH层触发SMM-SERVER的应用层根据业务逻辑进行相应的处理。本实施例订阅的事件为MIHlink-going-down信息，将MIH link-going-down信息描述成XML格式。SMM-SERVER first describes the MIH information in the form of XML (EXtensible Markup Language, Extensible Markup Language), and subscribes by encapsulating the information through the application layer protocol. SMM-SERVER can also transmit the request information for subscribing to network detection events by extending the application layer protocol; or subscribe to detection network events through the registration and subscription mechanism between the MIH layers of the two entities. When requesting, the notification is sent to the MIH information processing module of SMM-SERVER through the MIH layer, and then the MIH layer of the SMM-SERVER triggers the application layer of the SMM-SERVER to perform corresponding processing according to the business logic. The event subscribed in this embodiment is MIHlink-going-down information, and the MIH link-going-down information is described in XML format.

步骤204：接口1收到订阅网络检测事件的请求后，进行设置，将订阅成功响应发送给SMM-SERVER。Step 204: After receiving the request for subscribing to network detection events,interface 1 performs settings, and sends a subscription success response to the SMM-SERVER.

步骤205：接口1检测到满足切换预备条件的事件，向SMM-SERVER发送切换预备条件的事件发生的通知。Step 205:Interface 1 detects an event that meets the handover precondition, and sends a notification to the SMM-SERVER that the event of the handover precondition occurs.

本实施例中的切换预备条件为发生了MIH link-going-down信息。The handover precondition in this embodiment is that MIH link-going-down information occurs.

步骤206：SMM-SERVER得到切换预备条件的事件发生的通知后，请求接入设备进行资源预留。Step 206: The SMM-SERVER requests the access device to reserve resources after being notified of the occurrence of the handover precondition event.

SMM-SERVER得到切换预备条件事件发生的通知后，判断未来一定时间内会发生会话切换，综合考虑步骤202中所收集的会话信息，以及用户喜好、运营商配置的网络选择等信息后，SMM-SERVER向接入设备请求资源预留。After the SMM-SERVER is notified of the occurrence of the handover preparation condition event, it judges that a session handover will occur within a certain period of time in the future. The SERVER requests resource reservation from the access device.

步骤207：接入设备收到上述请求后，进行资源预留，然后将针对新的会话的资源预留标识通知给SMM-SERVER。Step 207: After receiving the above request, the access device reserves resources, and then notifies the SMM-SERVER of the resource reservation identifier for the new session.

步骤208：接口1在老化时间内检测是否满足切换发生条件，如果满足，执行步骤209；否则，执行步骤209′。Step 208:Interface 1 detects whether the handover occurrence condition is satisfied within the aging time, and if so, executes step 209; otherwise, executes step 209'.

步骤209：接口1将通知SMM-SERVER满足切换发生条件。Step 209:Interface 1 will notify the SMM-SERVER that the handover occurrence condition is met.

步骤210：SMM-SERVER收到通知后，发起并控制会话切换，通知使用预留的资源，建立通信对端与接口1的会话，会话切换完成后，执行步骤211。Step 210: After receiving the notification, the SMM-SERVER initiates and controls the session switch, notifies the use of reserved resources, and establishes a session between the communication peer andinterface 1, and executes step 211 after the session switch is completed.

步骤211：SMM-SERVER断开接口2与通信对端的会话，并通知释放原会话所占用的资源。Step 211: The SMM-SERVER disconnects the session between the interface 2 and the communication peer, and notifies the release of the resource occupied by the original session.

步骤209′：接口1将通知SMM-SERVER进行事件回滚。Step 209':Interface 1 will notify the SMM-SERVER to perform event rollback.

步骤210′：SMM-SERVER收到事件回滚的通知后，向接入设备请求将刚才申请预留的资源释放掉。Step 210': After receiving the notification of the event rollback, the SMM-SERVER requests the access device to release the resources reserved just now.

步骤211′：接入设备收到释放资源的请求后，释放预留资源，并向SMM-SERVER发送释放成功的响应。Step 211': After receiving the resource release request, the access device releases the reserved resource, and sends a response of successful release to the SMM-SERVER.

实施例3Example 3

以使用SIP(Session Initiated Protocol，会话发起协议)应用为例，可以在IMS(IP MultimediaSubsystem，IP多媒体子系统)网络上添加SMM-AS(Application Server，应用服务器)实现会话移动性控制。IMS是一个独立于接入技术的基于SIP的标准体系，它提供了一种与接入网相独立的核心网络。参见图8，为基于IMS网络的会话移动性控制结构图，其中包括终端UE、P-CSCF(Proxy Call Session Control Function，代理呼叫会话控制功能)、I-CSCF(Interrogating Call Session Control Function，关口呼叫会话控制功能)、HSS(Home SubscriberServer，归属用户服务器)、S-CSCF(Serving Call Session Control Function，服务呼叫会话控制功能)、SMM-AS和DB(Date Base数据库)。Taking the application of SIP (Session Initiated Protocol, Session Initiation Protocol) as an example, SMM-AS (Application Server, Application Server) can be added on the IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) network to realize session mobility control. IMS is a SIP-based standard system independent of access technology, and it provides a core network independent of the access network. See Figure 8, which is a structural diagram of session mobility control based on an IMS network, including terminal UE, P-CSCF (Proxy Call Session Control Function, proxy call session control function), I-CSCF (Interrogating Call Session Control Function, gateway call Session Control Function), HSS (Home Subscriber Server, Home Subscriber Server), S-CSCF (Serving Call Session Control Function, Service Call Session Control Function), SMM-AS and DB (Date Base database).

本实施例提供了一种基于IMS网络的会话切换方法，该在IMS网络上加入SMM-AS作为控制会话切换的服务器，终端UE上线后注册，SMM-AS将知道终端接口寻址信息，终端UE鉴权信息等，终端UE注册过程同现有IMS流程一样。This embodiment provides a session switching method based on an IMS network. The SMM-AS is added to the IMS network as a server for controlling session switching. After the terminal UE registers after going online, the SMM-AS will know the terminal interface addressing information, and the terminal UE Authentication information, etc., the terminal UE registration process is the same as the existing IMS process.

参见图9、图10，具体会话切换步骤如下：Referring to Figure 9 and Figure 10, the specific session switching steps are as follows:

步骤301：终端UE注册完成后，将通过接口2与通信对端进行会话，SMM-AS在这次会话发起的过程中通过接收并转发建立会话的信令方式收集这次会话的信息，包括会话标识，会话寻址信息，会话SDP等信息。Step 301: After the terminal UE is registered, it will conduct a session with the communication peer through interface 2. During the session initiation process, the SMM-AS collects the information of this session by receiving and forwarding the signaling for establishing the session, including session Identification, session addressing information, session SDP and other information.

步骤302：SMM-AS向终端UE的接口2订阅网络检测的事件。订阅的事件包括对网络状态的检测、信号强度等。Step 302: The SMM-AS subscribes to the interface 2 of the terminal UE for events detected by the network. Subscribed events include detection of network status, signal strength, etc.

本实施例采用向接口2发送订阅网络检测事件的请求为例进行说明，也可以通过接口2向接口1发送订阅网络检测事件的请求，或同时向接口1和接口发送订阅网络检测事件的请求。In this embodiment, a request for subscribing to a network detection event is sent to interface 2 as an example for illustration. A request for subscribing to a network detection event may also be sent tointerface 1 through interface 2, or a request for subscribing to a network detection event may be sent to bothinterface 1 and interface at the same time.

可以通过扩展SDP描述属性的字段来映射MIH信息，或通过SIP封装这些信息来订阅，也可以通过两个实体的MIH层间本身的注册订阅的机制来订阅检测网络的事件。MIH information can be mapped by extending the fields of the SDP description attribute, or subscribed to by encapsulating the information through SIP, or subscribed to the events of the detection network through the registration and subscription mechanism between the MIH layers of the two entities.

步骤303：接口2发送订阅成功响应给SMM-AS。Step 303: Interface 2 sends a subscription success response to the SMM-AS.

步骤304：终端UE的接口2实时检测，检测到满足切换预备条件的事件时，向SMM-AS发送满足切换预备条件的通知。Step 304: The interface 2 of the terminal UE detects in real time, and sends a notification that the handover preparation condition is met to the SMM-AS when detecting an event that meets the handover preparation condition.

步骤305：SMM-AS收到满足切换预备条件的通知后，结合在SMM-AS中配置的用户喜好、网络选择等切换规则等，判断未来一定时间内会发生会话切换，SMM-AS会根据收集并保留的本次会话的信息，将包括SDP在内的资源预留请求发送到PDF；Step 305: After the SMM-AS receives the notification that the handover preparation conditions are met, it judges that a session handover will occur within a certain period of time in the future based on the handover rules such as user preference and network selection configured in the SMM-AS, and the SMM-AS will use the collected And retain the information of this session, and send the resource reservation request including SDP to PDF;

步骤306：PDF鉴权这个请求，并将SDP映射成IP QoS参数，向新的网关GW申请资源预留。Step 306: PDF authenticates the request, maps the SDP into IP QoS parameters, and applies for resource reservation to the new gateway GW.

步骤307：网关GW收到申请后，进行资源预留。Step 307: After receiving the application, the gateway GW performs resource reservation.

步骤308：预留资源成功后，网关GW向PDF发送资源预留标识。Step 308: After the resources are reserved successfully, the gateway GW sends the resource reservation identifier to the PDF.

步骤309：PDF向SMM-AS转发针对新的会话的资源预留标识。Step 309: the PDF forwards the resource reservation identifier for the new session to the SMM-AS.

步骤310：接口2在老化时间内检测到满足切换条件的事件。Step 310: Interface 2 detects an event that meets the switching condition within the aging time.

步骤311：接口2将满足切换条件的事件发送到SMM-AS。Step 311: Interface 2 sends the event meeting the handover condition to the SMM-AS.

步骤312：SMM-AS会发起并控制会话切换的过程，建立通信对端与接口1的会话，并通知使用预留的资源，会话切换完成后断开原来的接口与通信对端的会话，并通知释放原会话占用的资源。Step 312: The SMM-AS will initiate and control the process of session switching, establish a session between the communication peer andinterface 1, and notify the use of reserved resources. After the session switching is completed, disconnect the original interface and the session of the communication peer, and notify Release the resources occupied by the original session.

步骤310′：接口2在老化时间内未检测到满足切换条件的事件。Step 310': Interface 2 does not detect an event satisfying the switching condition within the aging time.

步骤311′：接口2将状态回滚的消息发送到SMM-AS。Step 311': Interface 2 sends a state rollback message to the SMM-AS.

步骤312′：SMM-AS会通过PDF向网关请求，将刚才根据会话所申请的预留资源释放掉。Step 312': The SMM-AS will request the gateway through the PDF to release the reserved resources just applied for according to the session.

当步骤302为向接口1订阅网络检测的事件时，后面的检测和通知则由接口1负责执行，当步骤302为向接口2订阅网络检测的事件时，后面的检测和通知则由接口2负责执行。如果向接口1、接口2都订阅网络检测事件时，后面的检测和通知由接口1和接口2共同负责执行。When step 302 is to subscribe to the event of network detection tointerface 1,interface 1 is responsible for the subsequent detection and notification; when step 302 is to subscribe to the event of network detection to interface 2, interface 2 is responsible for the subsequent detection and notification implement. If you subscribe to bothinterface 1 and interface 2 for network detection events, subsequent detection and notification will be performed jointly byinterface 1 and interface 2.

以上实施例提供的控制会话切换的方法，通过在会话切换前能够作资源预留准备，当会话切换时，直接利用预先的准备的资源进行会话切换，可以实现更优的无缝切换，降低延迟时间，提高会话切换的效率。In the method for controlling session switching provided by the above embodiments, resource reservation preparations can be made before session switching, and when the session is switching, the pre-prepared resources can be directly used for session switching, which can realize better seamless switching and reduce delay time and improve the efficiency of session switching.

实施例4Example 4

参见图11，本实施例提供了一种服务器，包括：Referring to Figure 11, this embodiment provides a server, including:

会话信息收集模块401，用于收集网络接口的会话信息；A sessioninformation collection module 401, configured to collect session information of a network interface;

接收模块402，用于接收网络接口和/或空闲网络接口的切换相关信息；A receiving module 402, configured to receive handover related information of a network interface and/or an idle network interface;

切换预备模块403，用于当接收模块402中接收的切换相关信息满足切换预备条件时，根据所收集的会话信息通知网络中相应的网络设备为会话切换预留资源；这里的网络设备包括接入设备或网关等。The handover preparation module 403 is configured to notify corresponding network equipment in the network to reserve resources for session handover according to the collected session information when the handover related information received in the receiving module 402 meets the handover preparation conditions; the network equipment here includes access device or gateway etc.

会话切换控制模块404，用于当接收模块402中接收的切换相关信息满足切换条件时，控制会话在上述网络接口和/或空闲网络接口间切换，控制切换后的会话使用预留资源。The session handover control module 404 is configured to control the handover of the session between the aforementioned network interface and/or the idle network interface when the handover related information received in the receiving module 402 satisfies the handover condition, and control the handover session to use reserved resources.

这里的切换相关信息包括：网络接口和/或空闲网络接口发送的成功设置切换预备条件和切换条件的通知消息，设置的切换预备条件和切换条件对应的事件等。The handover-related information here includes: a notification message sent by the network interface and/or an idle network interface that the handover preparation condition and the handover condition are successfully set, events corresponding to the set handover preparation condition and the handover condition, and the like.

进一步地，服务器还包括：Further, the server also includes:

资源释放模块，用于在预设时间内不满足切换条件时，通知上述网络设备取消预留资源；以及会话切换完成后断开原会话，通知上述网络设备释放原会话占用的资源。The resource release module is used to notify the above-mentioned network device to cancel the reserved resource when the switching condition is not satisfied within the preset time; and disconnect the original session after the session switching is completed, and notify the above-mentioned network device to release the resource occupied by the original session.

更进一步地，服务器还包括：Furthermore, the server also includes:

设定模块，用于设定切换预备条件和切换条件。The setting module is used for setting the handover precondition and the handover condition.

其中，该服务器还包括：Among them, the server also includes:

订阅请求发送单元，用于向网络接口和/或空闲网络接口发送订阅切换预备条件和切换条件的请求。A subscription request sending unit, configured to send a request for subscribing to switching preconditions and switching conditions to the network interface and/or the idle network interface.

上述服务器还包括：The above servers also include:

存储单元，用于存储会话信息收集模块收集的会话信息，以及设定模块中的会话切换预备条件和切换条件信息。The storage unit is used to store the session information collected by the session information collection module, and the session switching precondition and switching condition information in the setting module.

切换预备模块403和会话切换控制模块404具体负责解析收集到的信令、数据，计算出需要的数据。如切换预备模块403具体还负责向其他网元发起会话切换准备请求，接收其他网元返回的会话切换准备情况的应答等。The handover preparation module 403 and the session handover control module 404 are specifically responsible for analyzing the collected signaling and data, and calculating the required data. For example, the handover preparation module 403 is also specifically responsible for initiating a session handover preparation request to other network elements, and receiving responses of session handover preparation status returned by other network elements, and the like.

存储单元中可以存放一个数据库，用于允许用户修改自己的应用相关的切换喜好规则，例如费用规则，服务规则；允许运营商修改网络选择等相关规则。初始化模块接收的信息包括其他模块发送的通知信息；收集的会话标识、寻址信息和SDP信息；以及向其他模块申请的资源描述信息。A database can be stored in the storage unit, which is used to allow users to modify their own application-related switching preference rules, such as fee rules and service rules; to allow operators to modify related rules such as network selection. The information received by the initialization module includes notification information sent by other modules; collected session identification, addressing information and SDP information; and resource description information applied to other modules.

数据库具体负责存储切换预备模块403和会话切换控制模块404运算后的结果数据，或者中间过程的数据，或者其他网元发送过来的数据，或者需要缓存并等待处理的数据，以及用户喜好数据，运营商数据；这些数据包括用户终端标识、终端能力信息、网络标识、类型、属性等信息，还可以包括用户喜好信息、运营商网络选择相关规则等相对固定的信息及数据、会话标识信息、会话寻址信息、会话SDP、新会话寻址信息等相对动态的信息及数据，也可以缓存初始化模块发送来的但未能及时处理的信令、数据等，或缓存需要发往其它模块的但未能及时处理的新产生的命令、数据等。The database is specifically responsible for storing the result data calculated by the handover preparation module 403 and the session handover control module 404, or data in the intermediate process, or data sent by other network elements, or data that needs to be cached and waiting for processing, and user preference data. These data include information such as user terminal identification, terminal capability information, network identification, type, attributes, etc., and may also include relatively fixed information and data such as user preference information, relevant rules for operator network selection, session identification information, session search information, etc. Address information, session SDP, new session addressing information and other relatively dynamic information and data. It can also cache the signaling and data sent by the initialization module but cannot be processed in time, or cache the signaling and data that needs to be sent to other modules but cannot be processed. Newly generated commands, data, etc. that are processed in a timely manner.

本实施例提供的服务器设置在网络上后，在会话切换前能够通过该服务器作资源预留准备，当会话切换时，直接利用预先的准备的资源进行会话切换，可以实现更优的无缝切换，降低延迟时间，提高会话切换的效率。After the server provided by this embodiment is set up on the network, resource reservation preparations can be made through the server before the session is switched. When the session is switched, the pre-prepared resources can be directly used for session switching, which can realize better seamless switching. , to reduce the delay time and improve the efficiency of session switching.

以上实施例通过在达到切换预备条件时，先为将要发生的会话切换预留资源，等达到切换条件时，直接进行会话切换，并使用预留的资源。这样提高了切换效率，实现更优的无缝切换，降低了延迟时间。In the above embodiments, when the handover precondition is met, resources are reserved for the upcoming session handover, and when the handover condition is met, the session handover is directly performed and the reserved resources are used. In this way, switching efficiency is improved, better seamless switching is realized, and delay time is reduced.

上述方法中的全部或部分步骤可以通过指令控制相应的硬件完成，该指令可以存储于存储介质中，存储介质如计算机或服务器的硬盘和内存中。All or part of the steps in the above method can be completed by controlling corresponding hardware through instructions, and the instructions can be stored in a storage medium, such as a hard disk and memory of a computer or server.

以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (12)

1. control the method that session is switched for one kind, it is characterized in that described method comprises:

The session information of collection network interface;

Receive the handover relevant information of described network interface and/or idle network interface;

Judge whether to satisfy the handover preparation condition according to described handover relevant information, if be session handoff reservation resource then according to collected session information;

Judge whether to satisfy switching condition according to described handover relevant information, if, then to control session and between described network interface and/or idle network interface, switch, described reserved resource is used in the session after control is switched.

2. the method that control session as claimed in claim 1 is switched is characterized in that, also comprises before judging whether to satisfy the switching condition step according to described handover preparation condition and switching condition described:

Judge whether to surpass the scheduled time,, then discharge described reserved resource if surpass.

3. the method that control session as claimed in claim 1 is switched is characterized in that the session information step of described collection network interface specifically comprises:

The session information of the mode collection network interface of mode by extensible markup language form, expanded application layer protocol or expansion Session Description Protocol.

4. the method that control session as claimed in claim 1 is switched is characterized in that described session information specifically comprises:

Session identification, addressing information or session description information.

5. the method that control session as claimed in claim 4 is switched is characterized in that the step of the handover relevant information of described network interface of described reception and/or idle network interface comprises:

Send the request of subscribing to handover preparation condition and switching condition to described network interface and/or idle network interface;

After described network interface and/or idle network interface are received described request, from described request, extract described handover preparation condition and switching condition, as monitor message, and notify described server to subscribe to success described handover preparation condition and switching condition.

6. the method that control session as claimed in claim 5 is switched, it is characterized in that the step of the request of described transmission subscription handover preparation condition and switching condition is specifically transmitted the request of subscribing to handover preparation condition and switching condition by the mode of extensible markup language form, expanded application layer protocol or the mode of expansion Session Description Protocol.

7. as the method for the described control session switching of arbitrary claim in the claim 1 to 6, it is characterized in that described handover preparation condition and switching condition comprise:

In default signal strength signal intensity threshold values, default network bandwidth threshold values, default service quality threshold values, default network cost performance threshold values or the default service ability threshold values one or multinomial.

8. a server is characterized in that, comprising:

The session information collection module is used for the session information of collection network interface;

Receiver module is used to receive the handover relevant information of described network interface and/or idle network interface;

The handover preparation module is used for when handover relevant information that described receiver module receives satisfies the handover preparation condition, is session handoff reservation resource according to corresponding network device in the collected session information informing network;

Session switching controls module is used for when handover relevant information that described receiver module receives satisfies switching condition, and the control session is switched between described network interface and/or idle network interface, and described reserved resource is used in the session after control is switched.

9. server as claimed in claim 8 is characterized in that, described server also comprises:

The resource release module when being used for not satisfying switching condition in Preset Time, notifies the described network equipment to discharge described reserved resource; And session switches and to finish the former session of back disconnection, notifies the described network equipment to discharge the resource that former session takies.

10. server as claimed in claim 8 is characterized in that, described server also comprises:

Setting module is used to set handover preparation condition and switching condition.

11. server as claimed in claim 8 is characterized in that, described server also comprises:

The subscribe request transmitting element is used for sending the request of subscribing to handover preparation condition and switching condition to network interface and/or idle network interface.

12. server as claimed in claim 10 is characterized in that, described server also comprises:

Memory cell is used to store the session information that described session information collection module is collected, and session handover preparation condition in the setting module and switching condition information.

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