Switchover control method

Abstract

The present invention provides two handover control methods, one of which includes: step S402, the target base station determines that the user equipment can access after receiving the handover request from the user equipment; step S404, the target base station or the source of the user equipment The base station sends a user equipment location update preparation message to the network control functional entity, instructing the network control functional entity to stop sending user equipment user data to the source base station; step S406, the user equipment and the target base station are synchronized; step S408, the user equipment and the target base station are synchronized Afterwards, the target base station sends the user location update message to the network control functional entity, instructing the network control functional entity to switch the transmission path to the target base station; and step S410, the user equipment connects with the target base station and starts communication. The present invention effectively controls the buffering amount of user data in the source / target eNB and the forwarding amount of user data between the source / target eNBs, thereby ensuring the data transmission performance in the handover process.

Description

Technical field [0001] The present invention relates to the field of communication, and in particular to a handover control method used in 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. Because of the physical layer technology of the air interface, the downlink transmission uses advanced and mature orthogonal frequency division multiplexing. With (OFDM) technology, the uplink transmission method is determined to be single carrier frequency division multiplexing (SC-FDMA) with low peak-to-average ratio, which has obvious advantages such as high spectrum 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 the new p...

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

Images