Serving gateway selection method and mobility management entity

Abstract

The invention discloses a serving gateway (S-GW) selection method and a mobility management entity (MME). The serving gateway selection method comprises the following steps: when confirming the need to reselect an S-GW for UE (User Equipment), the MME determines a first S-GW candidate list corresponding to a TAI (Tracking Area Identity) of a TA (Tracking Area) to which the UE is attached; the MME determines a first P-GW (Packet Data Network Gateway) candidate list corresponding to an APN (Access Point Name) used by the UE; the MME selects one S-GW which is arranged in a physical device together with P-GWs in the first P-GW candidate list from the determined first S-GW candidate list and takes the selected S-GW as the S-GW reselected for the UE. The technical scheme of the invention provides a specific implementation scheme for the MME to reselect an S-GW for the UE.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method for selecting a service gateway and a mobility management entity. Background technique [0002] The architecture diagram of the System Architecture Evolution (SAE, System Architecture Evolution) system developed by the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) is as follows: figure 1 As shown, it includes a user terminal (UE, User Equipment), an evolved universal terrestrial radio access network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network), a mobility management entity (MME, Mobility Management Entity), a service gateway ( S-GW, Serving Gateway) and Packet Data Network Gateway (P-GW, Packet Data Network Gateway). [0003] exist figure 1 Among them, E-UTRAN is the access network, which mainly realizes the radio resource management function; [0004] MME is a signaling entity, and its main functions incl...

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Problems solved by technology

[0007] In the prior art, when the UE initially attaches, the MME will select the S-GW and P-GW for the UE, and when the UE subsequently initiates a Tracking Area Update (TAU, Tracking Area Update) or S1 handover, sometimes it is necessary to select the S-GW and P-GW for the UE. The UE selects a new S-GW, but the inventor believes that with the increase in user demand brought about by the current business development, it is difficult for the existing MME to re-select a new S-GW for users to ensure service quality

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