A device for generating synchronization control adjust step length and the method thereof and the automatic switch method of the step length

Abstract

The invention discloses a device for generating the step length that is controlled and adjusted synchronistically as well as an automatic switch method for the setp length. The said device includes a Node B side module and a UE side module. The said method includes: the Node B side and the UE side module respectively determining the controlled step length kn of a current subframe according to a synchronistic control character SS[n-1]* processed and generated by the last subframe and a step length k[n-1] and the synchronistic control character SSn* of the user current subframe and an overadjust flag bit fOverAdjust. The automatic switch method for the step length includes the NODE and UE comparing whether the synchronistic character of the plural subframes which is sequential with the current subframe is the same direction as the synchronistic character of the current subframe, if so adopting the method which generates the synchronistic controlled and adjusted step length to generate the synchronistic control character; if not, adopting a fixed step length configured by a higher layer protocol. The invention obviously improves the speed of synchronistic tracking, overcomes the problems caused by the frequent conversion of the channel time delay, thereby obviously improving the system performance on the premise of no reduction of the synchronistic precision.

Description

technical field [0001] The present invention relates to a device and method for synchronous control in a mobile communication system, in particular to an adaptive method for generating synchronization in a Universal Terrestrial Radio Access Time Division Duplex (UTRA TDD) mobile communication system based on time division duplex. The device and method for controlling and adjusting the step size and the automatic switching method of the step size. Background technique [0002] UTRA TDD system, such as TD-SCDMA with a low code rate of 1.28Mcps is a third-generation digital mobile communication system based on time division duplex code division multiple access. In the uplink, multiple mobile stations send signals to the base station and share In the same channel, in order to prevent the overlapping of channel impulse responses of different users and the interference between signals, it is necessary to control each user synchronously to ensure that they arrive at the base statio...

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Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies in the prior art, to propose a device and method for synchronous control adjustment step size, the physical layer adopts an adaptive method to adjust the step size, realizes synchronous control, and overcomes the synchronous control algorithm of UTRA TDD wireless communication system The shortcoming of the medium adjustment step size being configured by the high-level protocol and the long change period solves the problems of slow synchronization speed and low precision in the existing technology

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