Method for expanding time-division synchronous CDMA access system ovelay range

A code division multiple access, time division synchronization technology, applied in the field of communication, can solve the problems of large system capacity loss, large base station modification, difficult implementation, etc., to achieve the effect of no loss of system capacity and wide coverage

Active Publication Date: 2007-11-21
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0005] (1) The mobile terminal carries out a certain time advance when sending the uplink pilot signal, but in the prior art, the sending time advance of the mobile terminal is based on the mobile The DwPTS received by the terminal and/or the power estimation of the main public control physical channel PCCPCH is determined. For wide-coverage scenarios such as sea and desert, due to differences in propaga...

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  • Method for expanding time-division synchronous CDMA access system ovelay range
  • Method for expanding time-division synchronous CDMA access system ovelay range
  • Method for expanding time-division synchronous CDMA access system ovelay range

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Embodiment Construction

[0029] In the current 3G standard, there are two definitions for the number of uplink pilot signal transmissions: one is the number of retries M at the physical layer of the mobile terminal, and the number of retries M can be configured from 1 to 8; the other is the number of retries at the protocol layer N, the number of retries N can be configured from 1 to 32. When the mobile terminal of the user initiates access, the power is incremented by a fixed step each time. If the mobile terminal still cannot detect the forward physical access channel (FPACH) after M times of transmission, the physical layer of the mobile terminal reports to the protocol layer. The protocol layer continues to initiate access according to the configured number of retries N. The design concept of the present invention is to not only change the power but also adjust the sending time advance point when the mobile terminal retries to access.

[0030] The present invention will be further described below...

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Abstract

In the invention, the method of establishing uplink synchronization by the mobile terminal in the system comprises: a) based on preact of the predetermined sending time, the mobile terminal sends the uplink pilot frequency signals; b) if the mobile terminal is not able to access, the physical layer of the mobile terminal resets the preact of the sending time, and returning to step a. The invention has the following advantages: 1)realizing the wide coverage at all kinds of scenes; 2) no need to scarifying the TS1 time slot as the extra protection time slot; 3) no need to modify the currently-used base station, and only need to make slight modification for the mobile terminal 4) no need to amend the criteria and rule.

Description

technical field [0001] The invention relates to a method for expanding the coverage of a Time Division Synchronous Code Division Multiple Access (Time Division Synchronous CDMA: TD-SCDMA) system, which belongs to the technical field of communication. Background technique [0002] The TD-SCDMA system is a new mobile communication system using Time Division Duplex (TDD) technology. In this system, the uplink and downlink signals are distinguished by time, and there are dedicated uplink and downlink pilot time slots. Uplink and downlink pilot signals to complete the uplink and downlink pilot functions. In the TD-SCDMA system, a wireless frame is 10ms long and divided into two 5ms wireless subframes with the same structure. The structure of the wireless subframe is shown in Figure 1. [0003] It can be seen from Figure 1 that in each subframe (subframe, 1.28Mcps, 5ms, 6400chip), there are 7 regular time slots TS0-TS6 and 3 special time slots, and the 3 special time slots includ...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04Q7/36H04J13/02H04W16/26H04W56/00
Inventor 蔡宝忠范永王叶青程广辉
Owner DATANG MOBILE COMM EQUIP CO LTD
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