Method, system and device for establishing session

Abstract

The invention discloses a method, a system and a device for establishing session, which aim to save resources occupied by transmitting media surface data between backbone networks of operators during session. The method provided by the invention comprises that: a PCRF acquires identifiers of access networks of a plurality of user terminals which need to establish session, wherein the plurality of user terminals contain the user terminals managed by the PCRF; and when determining that the plurality of user terminals are positioned in the access networks of the same region according to the identifiers of the access networks of the plurality of user terminals, the PCRF controls the user terminals managed by the PCRF to establish session with the opposite-end user terminals by adopting PDN connection of local breakout.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a session establishment method, system and device. Background technique [0002] At present, in the roaming scenario of the Evolved Packet System (EPS, Evolved Packet System), the 3GPPTS23.401 specification proposes two modes of PDN connection services for the user terminal (UE, User Equipment), one is called the Home Routed Mode (Home Routed Mode) Traffic) packet data network (PDN, Packet Data Network) connection refers to the PDN connection from the UE to the PDN gateway (GW) of its home network; another PDN connection called local breakout mode (Local Breakout) refers to A PDN connection from the UE to the PDN GW of its visited network (ie, the UE's access network). The interaction between the UE and the application function entity (AF, Application Function) of its home network, that is, the proxy session control function entity (P-CSCF, Proxy Call Session Con...

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Problems solved by technology

[0005] However, in the prior art, the PDN connections of the above two modes established for the UE are independent of each other. When the UE is in the roaming state and the UE initiates a session request to the called UE through the PDN connection of the home routing mode, according to The current EPS network standard specification stipulates that the media plane data flow sent by the calling UE in the roaming state must be transmitted to the PDN GW of the home network through the Serving GW of the VPLMN, the backbone network between the VPLNN and the HPLMN, and then passed through the HPLMN and The backbone network between VPLMN operators is delivered to the PDN GW serving the called UE. If the access network of the called UE and the access network of the calling UE are in the same area, that is, the calling UE and the called UE If they are located in the same area, the transmission of the media plane data flow between the calling UE and the called UE between the backbone networks of different operators occupies a large amount of transmission resources of the operator's backbone network, resulting in waste of resources and increasing data Transmission delay, thus reducing the quality of service (QoS, Quality of Service)

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