Method for implementing switchover

Abstract

This invention discloses a method to realize switching, applying to the network including at least two evolution base stations and Access Gateway, and user terminals switches from source to target base station, which includes: after switching preparatory stage, the sources evolution base station informs Access Gateway to stop sending it data. The source evolution base station sends the order of switching to user terminals and judges whether there is more data needed to send in its own cache, if so, the source evolution base station transmits its own cache data to the target one for continuous switching, and if not, conducts the follow-up switching processing.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for realizing switching. Background technique [0002] At present, the third generation (3G) network evolution is an important research project in the 3GPP standard organization, and its goal is to develop a new network architecture to keep the evolved 3G network competitive in terms of access technology. The evolved 3G network should have the technical characteristics of high speed, low delay, and IP. [0003] Therefore, in order to achieve the above purpose, it is necessary to solve the problem of mobility management (ACTIVE MM, Mobility Management of ACTIVE State) including user equipment in an active state (LTE-ACTIVE) in an evolved radio access network (RAN, Radio Access Network). ) including a series of related technical issues. [0004] From the current research status of ACTIVE MM, it can be seen that handover needs to be researched and described from two...

AI Technical Summary

Problems solved by technology

[0009] (1) During the handover execution phase, a large amount of data may need to be forwarded to the target eNodeB, increasing the cache and reordering pressure of the target eNodeB

[0010] (2) If the handover execution phase takes a long time, the buffer on the target eNodeB may overflow, causing the UE to lose some data packets

That is, part of the data is cached in the source eNodeB. At this time, it may not be possible to send all the cached data before initiating the handover execution

[0016] (2) The switching of the user plane is required to be performed before the arrival of the next PDU, and this moment is in the switching execution stage. Therefore, the actual user plane path switching scheme is the early path switching, which is consistent with the current consensus (during the switching process, the path switching Late Path Switching) Inconsistent

[0017] (3) The problem of user plane reverse handover caused by handover failure is not considered

[0019] However, Switch at AGW can theoretically avoid the reordering problem of the Data Forwarding scheme, but it does not consider the possibility that the data on the source eNodeB cannot be sent in time, and does not consider the reverse switching problem of switching failure

[0020] Therefore, currently, late path switching is not used in evolved networks, and the switching process is not robust

Moreover, there is no solution that can alleviate the source eNodeB's sending pressure on possible cached data, low interrupt latency, and no reordering method

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