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Session-switching method
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A technology of session switching and session update, which is applied in the field of communication, can solve problems such as media data routing detours, and achieve the effects of overcoming routing detours, ensuring feasibility, and simplifying functions
Inactive Publication Date: 2011-08-10
ZTE CORP
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Problems solved by technology
[0023] The technical problem to be solved by the present invention is to solve the problem of media data route detour after session switching in the prior art, and propose a method for session switching. After session switching, the media data channel does not need to be detoured to the home network of the UE in the roaming state
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Embodiment 1
[0053] Such as Figure 5 As shown, for the process of establishing a SIP session and then switching, the UE initiates a session through the source access network, then switches to the target access network, and uses the UPDATE (update) message to implement the update of the session, including the following steps:
[0054] 501, the user initiates a session, and the UE sends a SIP session request to the peer UE; after the SIP session request reaches the MMS, the MMS will change the contact address information of the UE at the SIP layer to the address information of the MMS, and the subsequent response message , the MMS will restore the UE's contact address information, and then forward the response message to the UE; subsequent SIP messages are forwarded through the MMS, and the MMS will also perform the same processing on the UE's contact address information;
[0055] In this step, the MMS does not modify the SDP information. In this way, in the subsequent steps, the media data...
Embodiment 2
[0066] Such as Image 6 As shown, the process of setting up a SIP session and then switching occurs, the UE initiates a session through the source access network, then switches to the target access network, and uses the INVITE (invitation) message to implement the update of the session, including the following steps:
[0067] 601, the user initiates a session, and the UE sends a SIP session request to the peer UE; after the SIP session request reaches the MMS, the MMS will change the contact address information of the UE at the SIP layer to the address information of the MMS, and the subsequent response message , the MMS will restore the UE's contact address information, and then forward the response message to the UE; subsequent SIP messages are forwarded through the MMS, and the MMS will also perform the same processing on the UE's contact address information;
[0068] In this step, the MMS does not modify the SDP information. In this way, in the subsequent steps, the media ...
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Abstract
The invention discloses a session-switching method. The method comprises the following steps that: during a session, a MMS (mobility management server) directly forwards SDP (on, the mobility management server MMS forwarded directly between the user equipment UE session description protocol) information between UE (user equipment); when one UE enters a target access network and initiates a sessionswitch, the UE initiating the session switch sends updated SDP information to the opposite-side UE through the target access network via the MMS; and according to SDP media address information in theupdated SDP information, the UE initiating the session switch and the opposite-side UE transfers media data via the target access network. The method has the advantages of ensuring the feasibility ofthe whole session-switching process and overcoming the problem of periphrastic route of the media data. In addition, as the media data do not need to be forwarded via the MMS, the function of the MMSis simplified.
Description
technical field [0001] The present invention relates to the communication field, in particular to a session switching method. Background technique [0002] When a UE (User Equipment, user equipment) having a session moves between different access networks, the contact address of the UE may change. In order to ensure the continuity of the ongoing session, in addition to sending the media sent by the local UE to the peer UE of the session through the new access network, it is also necessary to correctly send the media sent by the peer UE to the local end UE, this is session switching. Existing frameworks for session switching schemes such as figure 1 As shown, including the following entities: [0003] UE, including two functions, one is UA (User Agent, User Agent), which completes UA-related functions defined in SIP (Session Initiation Protocol, Session Initiation Protocol), such as generating request / response, processing request / response, etc.; the other The function is ...
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