Cell switching method and user terminal

Abstract

The invention provides a cell switching method and a user terminal. The method comprises the following steps that: when the user terminal is switched from a global system for mobile communication (GSM) cell to a time division synchronous code division multi-address access (TD-SCDMA) cell, the user terminal acquires the uplink pilot channel (UpPCH) position information carried in a No.16 TD-SCDMA system message of the TD-SCDMA cell; and the user terminal sends an uplink pilot signal on a resource indicated by the UpPCH position information. The cell switching method can improve the access success rate for switching the user terminal to the TD-SCDMA cell and enhance the user experience.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a cell switching method and a user terminal. Background technique [0002] Although the third-generation 3G network will be more and more widely used, it is still in the initial stage of 3G construction. It must rely on the second-generation 2G network to solve the coverage and roaming problems, and the coexistence of 2G and 3G networks will continue. For a long time, in order to meet this usage requirement, the user terminal may be a dual-mode user terminal. Dual-mode user terminals can obtain high-speed data services and voice services of the 3G network in areas covered by the 3G network, while dual-mode user terminals can still obtain services of the 2G network in areas not covered by the 3G network. This model not only creates a flexible technical means for operators, but also allows users to move forward to 3G smoothly and seamlessly. [0003] In the T...

AI Technical Summary

Problems solved by technology

[0003] In the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system in 3G technology, the synchronization between different base stations is maintained, but as the propagation distance increases, the downlink signal sent by the base station in the neighboring cell may interfere with the uplink pilot signal in the local area. Generate interference, thereby affecting the normal operation of the base station

However, when using this method, the dual-mode user terminal cannot know the position information of the uplink UpPCH, and can only send it on the uplink pilot time slot (UpPTS), which causes the position where the dual-mode user terminal sends the uplink pilot to be received by the base station. The positions of the uplink pilots are different, which causes the access failure of dual-mode user terminals and affects the user experience

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