Closed-loop uplink synchronization controlling method in wireless communication system

Abstract

This invention discloses one wireless communication system loop simultaneous control method, which comprises the following steps: base station clearing register S1 and adding simultaneous bias orders to register S1 by the UE and sending relative simultaneous bias orders till the add values isolate values T1 less than gate valve A times larger than N1; the base station continuing measure the UE simultaneous bias values and not sending UE bias orders and clearing the register S2 to zero; adding simultaneous bias orders to register S2 till the bias values adds to larger than the times of gate limit times in time zone and then repeating the current flow.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a closed-loop uplink synchronization control method in a wireless communication system. Background technique [0002] For wireless communication systems, especially for TDD (Time Division Duplex) CDMA (Code Division Multiple Access) systems, such as TD-SCDMA (Time Division Synchronous Code Division Multiple Access) systems, there is a requirement for uplink synchronization, that is, different user terminals are required The uplink signals can arrive at the base station synchronously, so that the main path of each uplink signal can be synchronized at the base station side, which has obvious benefits for improving the performance of the wireless communication system and simplifying the design of the base station receiver. [0003] At present, a more effective uplink synchronization control method is a closed-loop uplink synchronization control method. In this...

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Problems solved by technology

[0010] One is that the base station needs to adjust all user terminals within a certain time interval, and needs to use dedicated transmission resources to periodically transmit all synchronization control commands from the base station to the user terminals. In some systems with relatively tight transmission resources, The transmission of closed-loop synchronous control commands will cause a considerable load on system transmission resources;

[0011] Second, once the closed-loop synchronization control is started, the base station must periodically adjust the synchronization of the user terminal. For some wireless systems with a relatively stable channel environment, although the position of the main path of the signal transmitted by the terminal is relatively stable, the existence of noise and multipath It will cause errors in the judgment of the position of the main path, which will cause errors in the synchronization control of the base station to the user terminal; in addition, in a wireless system with a relatively stable channel environment, the position of the main path of the signal transmitted by the user terminal is relatively stable, and the base station always uses a certain A faster synchronous control frequency Continuous synchronous control of user terminals is easily affected by noise and multipath, which will affect the synchronous control effect of the system

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