Downstream synchronization monitoring apparatus and method for mobile terminal and application thereof
A mobile terminal and monitoring device technology, applied in synchronization devices, transmission monitoring, transmission channel monitoring and other directions, can solve the problems of synchronization adjustment and tracking failure, synchronization offset too large, received data errors, etc., to avoid system communication quality degradation, The effect of reducing cost and power consumption
Inactive Publication Date: 2008-02-27
ST ERICSSON SEMICON BEIJING
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Problems solved by technology
However, when the transmission channel changes suddenly due to the movement of the terminal, the receiver is likely to analyze the wrong channel estimation window according to the previous downlink synchronization information (that is, the position of the channel estimation window), resulting in an error in the estimation of the synchronization offset (as shown in Figure 1b ), and make incorrect synchronization adjustments, resulting in incorrect data received
This is a possible risk of synchronous tracking based on data
[0009] Second, error accumulation leads to synchronization tracking failure
[0011] Therefore, in the prior art, when the terminal physical layer receiver adopts the downlink synchronization tracking adjustment according to the received data, there is no mechanism that can monitor whether the current synchronization offset falls within the adjustable range of the synchronization adjustment device, and find out in time that the If the synchronization offset is too large, the synchronization adjustment tracking may fail to send a signal to remind the system to re-acquire the downlink synchronization
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[0028] The structure of the downlink synchronous monitoring device adopted by the present invention is shown in Fig. 2, which is composed of a channel estimator, a center of gravity estimator, a smoothing filter, a subtractor, a comparator, a decision device, a register and a delayer.
[0029] The working flow of the downlink synchronization monitoring device of the present invention will be described in detail below.
[0030] First, the channel estimator estimates the channel impulse response sequence based on the received data of the nth frame
[0031] The center of gravity estimator calculates the channel impulse response sequence The centroid B of the channel response of the nth frame c (n) (average delay value of channel multipath power);
[0032] The smoothing filter performs smooth filtering on the center of gravity value of the channel response of several consecutive frames to eliminate the influence of noise and small instantaneous fluctuations, and obtains the e...
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The invention provides a down-going synchronous monitoring device and method for mobile terminal and its application. Firstly, according to the received data, it estimates the barycenter of channel impact response sequence, compares barycenter estimation value with the barycenter value in synchronous state, judging if the barycenter deflection is greater than some threshold value to determine if the current synchronous deflection belongs to the range able to be adjusted by the down-going synchronous adjustment tracking algorithm. Its effects: it can effectively monitor the status of down- going synchronization of the receiver in the data receiving course and gives an alarm to synchronous adjustment failure possibly occurring, thus effectively avoiding the reduction of system communication quality, even communication interruption.
Description
technical field [0001] The present invention relates to a wireless communication system, in particular to a device and method for monitoring downlink synchronization of a mobile terminal in the wireless communication system, and a method for monitoring downlink synchronization in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) mobile terminal. technical background [0002] In the digital mobile communication system, in order to correctly receive the information sent by the base station (BS), the mobile terminal (UE) must use the correct clock information to periodically sample the received signal and analyze the data frame, that is, to realize the downlink synchronization with the base station (DL Synchronization). The downlink synchronization of the mobile terminal is divided into two stages: synchronization establishment and synchronization adjustment and tracking. In the synchronization establishment phase, the mobile terminal searches for the synchr...
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IPC IPC(8): H04B1/707H04B17/00H04L7/00H04B17/30
Inventor 董霄剑陶涛
Owner ST ERICSSON SEMICON BEIJING