Switching method with switch determination participated by user terminal and implementing equipment thereof

Abstract

The invention discloses a switch method for user terminals to participate in switch decisions, including the following steps: at first, the source base station chooses a group of down node-sets according to the measurement information, and then during switch, the user terminal chooses an optimized switch target from former down node-sets chosen by the resource base station according to present measurement information. The invention realizes macro-diversity of downstream data during switch preparation stage, which not only solves the problem that UE is easily dropped during switch process, butalso brings diversity gain, improves service quality effectively, increases switch speed. The invention also discloses a system, a base station and use terminal for user terminal to participate switch decision. Because the target switch channel is independently chosen by user terminal during switch according to the invention, it can be more accurate to switch to a perfect target channel in the situation of rapidly changed wireless environment, thereby ensuring the switch quality of switch effectively.

Description

technical field [0001] The present invention relates to cell handover technology of a mobile communication system, in particular to a handover method for a user terminal to participate in handover decision and its realization equipment. Background technique [0002] In the third-generation mobile communication Long Term Evolution (LTE) system, when the radio channel environment changes, it will trigger the cell handover of the user terminal. When the user terminal performs cell handover, it usually includes two stages of handover preparation and handover execution. In the handover preparation phase: the user terminal will send a measurement report to the source base station, the source base station selects a suitable target cell according to a certain algorithm, and then sends a handover request message to the target base station to which the target cell belongs, requesting the target base station to reserve Corresponding resources; if the target side has corresponding free ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the handover preparation process usually takes a long time, and during this period of handover preparation, the user terminal is still provided with uplink and downlink services by the source base station. When the user terminal is in a border area or in a high-speed mobile state, It is easy to cause call drop in the handover preparation stage, seriously affecting the normal use of users

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

[0005] In addition, in the existing handover process, the uplink and downlink services are switched at the same time. 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. Downlink services are switched at the same time. In the same time, the interruption of downlink services will have a greater impact on service performance.

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