Method and system for implementing district switch by mobile terminal

Abstract

The invention discloses a method for mobile terminal to realize channel switch, which includes the following steps: during the switch preparation stage, a source base station ensures a target node and a down node-set according to measurement information, and the down node-set begins to provide downstream transmission data for the mobile terminal during the switch preparation stage; during the switch stage, the mobile terminal switches the uplink into the target node, then the downstream data is still sent by down node-set; after the switch, the down node focus the node release resources except the target node, and the target node provides up-down service for mobile terminal. The invention also discloses a system and a base station for mobile terminal to realize channel switch, using the method, system and base station can reduce drop-calls and resource occupation of mobile terminal in switch process, and realize continuous receiving of downstream data in the whole switch process by mobile terminal, and improves transmission service quality of mobile terminal.

Description

technical field [0001] The present invention relates to a technology for cell switching by a mobile terminal, in particular to a method and system for a cell switching by a mobile terminal. Background technique [0002] In the 3GPP Long Term Evolution (LTE) system, when a mobile terminal performs cell handover, it usually includes two stages of handover preparation and handover execution. In the handover preparation stage: the mobile terminal monitors the wireless channel environment in real time. When the wireless channel environment changes, the mobile terminal will send a measurement report to the source base station; The target base station sends a handover request message, requiring the target base station to reserve corresponding resources for the mobile terminal; if the target base station has corresponding idle resources, or the resources required by the mobile terminal can be freed through certain scheduling, the target base station sends a message to the source bas...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that from the source base station requesting the target base station to reserve corresponding resources for the mobile terminal to the final handover of the mobile terminal to the target base station, the handover preparation process usually takes a long time, and during this period of handover preparation, the mobile terminal Both uplink and downlink services are provided by the source base station. In this way, it is easy to cause call drop during the handover preparation stage, especially when the mobile terminal is at the cell boundary or in a high-speed motion state.

Not only that, for the target base station, it does not know that the mobile terminal has dropped the call, and will still reserve corresponding resources for the mobile terminal for a period of time, until the source base station sends a handover cancel command, the target base station will cancel the resource reservation , resulting in a waste of resources

[0005] At the same time, during the handover process of the existing LTE system, when the source base station sends a handover command to the mobile terminal and the mobile terminal sends a handover confirmation Handover Confirm to the target base station, the base station cannot receive any downlink transmission data. The downlink transmission data sent by the core network must be buffered in the base station, and the mobile terminal cannot restart receiving data until the connection between the mobile terminal and the target base station is established, so that the mobile terminal is temporarily disconnected from the network.

[0006] In addition, in the existing handover process, the uplink and downlink services are switched simultaneously. For more and more types of services in the mobile communication system, the transmission rate of many downlink data is much higher than the transmission rate of uplink data. The business is switched at the same time. In the same time, the interruption of the downlink business will have a great impact on the business performance.

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