Switchover control method

Abstract

The invention provides two switching control methods, and one of them includes: step S402, the target base station determines that UE can access after receiving its switching request. Step S404, the target base station or the source base station of UE sends the location update preparing information of UE to network control function entity, to instruct it to stop send the source base station the user data. Step S406, the target base station and UE conduct synchronization. Step S408, after synchronization, the target base station sends the user' s location update information to the network control function entity, to instruct it to switch the transmission path into the target base station. Steps S410, UE and the target base station connect and begin communication.

Description

technical field [0001] The invention relates to the communication field, in particular to a handover control method for a communication network. Background technique [0002] The 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution) project is the largest new technology research and development project launched by 3GPP in the past two years. In terms of the physical layer technology of the air interface, the downlink transmission adopts advanced and mature OFDM Using (OFDM) technology, the uplink transmission method is determined to be single-carrier frequency division multiplexing (SC-FDMA) with a relatively low peak-to-average ratio, which has obvious advantages such as high spectral efficiency, high downlink transmission rate, and small transmission delay. [0003] In terms of access network architecture, the main goal of the design is to reduce delay and complexity, so that the protocol can effectively support new physical layer transmission technology, t...

AI Technical Summary

Problems solved by technology

[0023] 1. After the source eNB UE sends the "handover instruction" message, it will no longer send data to the UE through the air interface, so the data from the UPE can only be cached in the source eNB, which occupies a large number of cache resources of the source eNB and affects the connection of the source eNB. Ability to import new UEs

[0024] 2. After the source eNB sends the "handover instruction" message to the UE, it needs to forward all the data it buffers to the target eNB through the X2 interface, which increases the amount of data forwarded and the transmission time between the source eNB and the target eNB, resulting in data transmission Increased time delay and reduced security and reliability of data during transmission

[0039] As mentioned above, in the handover process of prior art 2, when the handover UE has not yet established a radio link connection with the target eNB, the source eNB sends a "UE location update" message to the MME / UPE, and the MME / UPE starts to The user data of the handover UE is directly sent to the target eNB and cached. The disadvantages are:

[0040] 1. Before the UE accesses the target eNB, it occupies a large amount of data buffer resources in the target eNB, causing waste and affecting the access of other UEs in the target eNB

[0041] 2. If the synchronization process between the UE and the target eNB fails during the handover process, and the UE needs to return to the source eNB to establish a connection, then the target eNB needs to re-forward all the UE user data it caches to the source eNB, resulting in waste of resources on the target eNB. The interruption time of the handover process increases, and a large amount of data is transmitted between the source eNB and the target eNB through the X2 interface, which reduces the security and reliability of data transmission and increases the transmission load of the X2 interface, which is easy to cause congestion and increase transmission delay

[0042] Existing technology 1. During the handover preparation process, the MME / UPE has no path transfer, and keeps sending user data to the source eNB, resulting in the problem of excessive buffering of user data in the source eNB and excessive data forwarding between the source eNB and the target eNB.

[0043] Prior Art 2 In the state where the handover is not completed, the MME / UPE completes the path transfer in advance and sends the user data to the target UE, resulting in the amount of buffered user data in the target eNB, and the distance between the source eNB and the target eNB after the handover process fails. The problem of excessive data forwarding between

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