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Calculation method of timing relationship between GSM/TD dual-mode terminal systems

A GSM system, dual-mode terminal technology, applied in the field of receivers, can solve the problems of multiple hardware resources, occupation, affecting the performance of GSM/TD dual-mode terminals, etc., to achieve the effect of ensuring timing accuracy and simplifying hardware complexity

Active Publication Date: 2009-09-23
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
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Problems solved by technology

[0003] Known from the prior art, although the current GSM single-mode terminal timing system and the TD-SCDMA single-mode terminal timing system both use frame number and sample point number, their sample point time length, frame and sample point value ranges are all different, And the control clocks are independent of each other. If two separate control clocks are used in the GSM / TD dual-mode terminal system, it will not only occupy more hardware resources, but also increase the frame design of the GSM / TD dual-mode terminal system, thereby affecting the GSM / TD dual-mode terminal system. TD dual-mode terminal performance

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  • Calculation method of timing relationship between GSM/TD dual-mode terminal systems

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Embodiment Construction

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, a method for calculating the timing relationship between GSM / TD dual-mode terminal systems of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] The timing system of the GSM single-mode terminal is composed of two parts: the system frame number GSMFn and the intra-frame sample point number GSMSn, wherein the range of the system frame number GSMFn is 0, 1, ..., 2715647.

[0018] In order to obtain GSM synchronization information, the GSM terminal needs to read synchronization channel (SCH for short) information. Since the multiframe period of SCH is 51 frames, the GSM timing system is based on the timing system of 51 frames, that is, the system frame number GSMFn modulo 51 to obtain frame numbers ranging from 0, 1, ..., 50. The sample point number GSMSn in the frame is related to the GSM fra...

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Abstract

The invention provides a calculation method of timing relationship between GSM / TD dual-mode terminal systems. Time relationship of initial synchronization of a GSM / TD terminal timing system and corresponding time relationship between the two modes after time T are determined by utilizing the time relationship between a GSM frame and a TD-SCDM subframe. The timing synchronization method not only ensures the timing precision of the GSM / TD dual-mode terminal system, but also reduces GSM / TD dual-mode terminal systems clocks to one, thus simplifying the hardware complexity of the GSM / TD dual-mode terminal systems.

Description

technical field [0001] The invention relates to a receiver of a mobile communication system, in particular to a method for calculating the timing relationship between GSM / TD-SCDMA (abbreviated as GSM / TD) dual-mode terminal systems. Background technique [0002] At present, the GSM system is relatively mature and has many users. At the same time, due to the limitation of the development progress and maturity of communication technology, the GSM system will coexist with the TD-SCDMA system for a long period of time, so there is a demand for GSM / TD dual-mode terminals. . GSM / TD dual-mode dual-standby means that two systems work independently at the same time without interfering with each other. It has great practicability and market prospects. However, due to its high cost and high power consumption, the current terminal technology still cannot meet its performance requirements. Therefore, the GSM / TD dual-mode single-standby automatic switching terminal will still exist in a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W88/06
Inventor 李小文陈发堂吴广富
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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