Method for measuring GSM reconfirmation in TDD mode
One mode, the next technology, applied in the measurement field of GSM cell for reconfirmation, can solve the problems of large effect number error, required accuracy, time error, etc., and achieve the effect of high accuracy and less occupation
Active Publication Date: 2012-01-11
LEADCORE TECH
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[0007] (3) Since the frame lengths of the two systems are different, there will be a time error when the two counting systems are converted to each other (the quotient of the frame number difference divided by 13 and then multiplied by 12, when the frame number difference is large, no matter how many decimal points are retained There will be a large error in the number of effective numbers at the end), and timing requires precision, so it may cause fatal problems, so it is very difficult to deal with the remainder of division
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0034] The method for measuring GSM reconfirmation under the TDD mode of the present invention is to know that the GSM frame has been received at the position of the offset last_td_offset (value range 0~6400, unit chip) in the TDD frame whose frame number is last_td_subframe_number (ltdsfn) The SB (Special Burst, special pulse) in the GSM frame whose number is last_gsm_frame_number (lgfn), and the known current TDD frame number is current td_subframe_number (ctdsfn) and the idle situation of time slots in each frame after the ctdsfn frame, and find out After the ctdsfn frame, in which idle time slot of the TDD frame can receive the SB of the GSM at the earliest, and request the frame number netx_gsm_frame_number (ngfn) of the GSM frame where the SB is located.
[0035] The physical quantities involved in the present invention are as follows:
[0036] T...
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The invention discloses a method for measuring the GSM reconfirmation in a TDD mode, which has a simple algorithmic procedure and a precise measurement result. The technical sachem is that the method comprises the following steps: updating a last time synchronizing time point according to the period number with the length of 3.06 seconds existing between the last time synchronizing time point anda current time point; by taking 1 / 13 or the length of a TDD frame as a timing unit delta, converting the offset in the TDD frame of the last time synchronizing time point into a delta number and the offset in the delta, and converting the offset of a known idle window in the TDD frame into the delta number; and according to the remainder of a model 51 of a GSM frame number of the last time synchronization and according to an expected position of a synchronization pulse in the TDD frame, calculating the frame number difference of the GSM frame number between the last time synchronizing time point and the next time synchronizing time point, and converting the frame number difference into the TDD frame number difference and the intra-frame offset. The method is applied to mobile communication.
Description
technical field [0001] The invention relates to a method for measuring synchronization time, in particular to a method for reconfirming GSM cells in a TDD mode with a simple and accurate algorithm process. Background technique [0002] In order to provide dual-mode mobility support for terminals, it is necessary to regularly measure the information of GSM neighbor cells near the terminal, and some measurement results need to be reported to the network side to support reselection and handover functions. Reconfirmation is a measurement item containing cell synchronization information. With reconfirmation information of a GSM cell, time synchronization with the handover target cell can be achieved when reselection or handover is required. It is obtained by receiving the SB ( sync pulse) is achieved. [0003] There are two known implementation schemes. The first one is to use the known cycle of 13×51 to configure SB reconfirmation at a fixed location (used in A2000+). Due to th...
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IPC IPC(8): H04W80/00H04B7/26
Inventor 沈凡
Owner LEADCORE TECH