Switching method, communication system and associated equipment

Abstract

The embodiment of the invention discloses a switching method, a communication system and associated equipment, which are used for realizing lossless switching of data when a service gateway (SGW) changes. The method comprises: sending an end marking package to a target side access element location when an access network changes and a source side SGW changes so as to facilitate the target side access element location of distributing down data from a target side core network according to the indication of the end marking package. The embodiment of the invention also provides the communication system, a service gateway and a packet data network gateway.

Description

technical field [0001] The invention relates to the field of communication, in particular to a switching method, a communication system and related equipment. Background technique [0002] During the handover process of access network elements inside the current Evolved Packet Network (EPS, Evolved Packet System), in order to ensure that user data is not lost during the handover process, that is, lossless. The access network of the source network needs to forward the downlink data that has not been sent to the terminal to the target network, and the access network of the target network sends it to the terminal; at the same time, in order to ensure that the downlink data is transmitted to the terminal in an orderly manner, The access network of the target network needs to distinguish between the downlink data forwarded by the source-side network and the downlink data delivered by the core network of the target network, and try to ensure that the data forwarded by the source-s...

AI Technical Summary

Problems solved by technology

[0003] The above method requires the SGW to send an end marker packet to the target-side access network, which can be implemented if the core network service gateway remains unchanged, but in fact, when a handover occurs, the core network service gateway changes or the mobility management network element Changes may occur, and the switching that occurs in this case also has data lossless requirements

At the same time, due to the existence of GSM / EDGE Radio Access Network (GERAN, GSM / EDGE Radio Access Network), UMTS Terrestrial Radio Access Network (UTRAN, UMTS Territorial Radio Access Network) and evolution The different access technologies of the Evolved UMTS Territorial Radio Access Network (EUTRAN, Evolved UMTS Territorial Radio Access Network), the handover can be divided into the handover within the same access technology, and the handover between different access technologies. Switching between different access technologies in EUTRAN and second / third generation networks will inevitably lead to changes in the SGW of the control plane

Therefore, in the prior art, there is no solution on how to realize lossless transmission of data in the case of handover where the SGW changes

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