Terminal synchronous timing control method and device

Abstract

The invention relates to a terminal synchronous timing control method and device, which are applicable to time division multiplexing systems. The method comprises the following steps: firstly obtaining downlink synchronous timing; then obtaining the adjustment quantity of downlink synchronous timing; and then adjusting downlink synchronous timing in a guard period (GP) according to the adjustment quantity of downlink synchronous timing. Correspondingly, uplink synchronous timing can be adjusted in the same GP. The method and the device have the following beneficial effect: uplink / downlink timing is adjusted in the GP and the continuous transmitting or receiving event which is performed in advance is unnecessary to be interrupted, thus ensuring seamlessness of uplink / downlink transmitting and receiving.

Description

technical field [0001] The invention relates to a terminal synchronous timing control method, which is applied to a Time Division Duplex (TDD, Time Division Duplex) system. Background technique [0002] In the 3G mobile communication system standard TD-SCDMA system proposed by China and its evolution TD-LTE system, time division duplex (TDD) technology is used. [0003] The subframe structure in TD-SCDMA system is as follows: figure 1 shown. In the TD-SCDMA system, the subframe length is 5ms, and the wireless frame length is 10ms, and the terminal maintains the subframe number (SFN, SubFrame Number) according to the network system information. Each 5ms subframe contains 7 time slots and 2 special time slots. Among them, TS0 is fixed for downlink, TS 1 is fixed for uplink, special time slot DwPTS is downlink common transmission time slot, UpPTS is uplink common transmission time slot, GP (Guard Period) is guard interval, not used for any uplink and downlink transmission ,...

AI Technical Summary

Problems solved by technology

[0026] It can be seen that the "immediately effective" timing adjustment scheme has the following disadvantages: first, in the downlink synchronous timing control, the terminal needs to interrupt the continuous receiving event in advance and re-adjust the downlink timing; moreover, the terminal needs to adjust the downlink timing in real time according to the calculated timing adjustment However, in the actual signal propagation environment, due to the influence of multipath and noise, the instantaneously calculated synchronization adjustment amount will be unreliable, which will directly lead to timing synchronization adjustment errors

Secondly, in terms of uplink synchronization timing control, the terminal needs to interrupt the continuous sending events in advance and re-adjust the uplink timing; moreover, because the TA downlink receiving timing is used as a reference, due to the uncertainty of the downlink synchronization timing adjustment timing, it cannot be deducted due to downlink synchronization. The impact of timing adjustment will lead to TA calculation errors

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