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Primary upload synchronizing method in TDMA system

A technology of code division multiple access and time division synchronization, which is applied in the direction of communication between multiple stations, and can solve the problems that terminals cannot access the network and base stations cannot detect uplink synchronization signals, etc.

Active Publication Date: 2009-11-25
XIAOMI INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology limits the radius of the cell to not exceed 11.25KM. If this limit is exceeded, the base station will not be able to detect the uplink synchronization signal, and the terminal will not be able to access the network.

Method used

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  • Primary upload synchronizing method in TDMA system
  • Primary upload synchronizing method in TDMA system
  • Primary upload synchronizing method in TDMA system

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The present invention adopts and figure 1 The same frame structure is shown. It should be emphasized that: for the DwPTS in the present invention, a specific subframe is used to send downlink pilot signals, while in non-specific subframes, this time slot can be used to provide mobile stations to send uplink pilot signals. That is to say, the base station can send the downlink pilot signal in the time slot in the predetermined subframe, and the mobile station can use the time slot to send the uplink pilot signal in the subframe in which the base station does not send the downlink pilot signal.

[0032] Moreover, the transmission period of the Dw-PTS downlink pilot signal can be set, for example, the downlink pilot signal is transmitted every N frames, where...

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Abstract

The invention discloses an initial uplink synchronization method in a time division synchronous code division multiple access system. Each subframe in the system includes TSO, downlink pilot time slot DwPTS, uplink pilot time slot UpPTS, guard time slot GP and TS 1~TS6, TS0~TS6 are business time slots. The method is: after the mobile station receives the downlink pilot signal sent by the base station in the downlink pilot time slot DwPTS in the predetermined subframe, it completes the downlink synchronization; In the subframe for sending the downlink pilot signal, select a time point within a period of time from the end of TS0 to the end of GP as the starting moment for sending the uplink pilot signal to the base station, thereby initiating the initial uplink synchronization process. In addition, during the initial uplink synchronization process, the base station searches for a period of time from the end of TS0 to the beginning of TS1 to detect the uplink synchronization signal. This method can increase the radius of the cell, and further meet the requirements of long-distance user access.

Description

technical field [0001] The invention relates to an uplink synchronization technology in a mobile communication system, in particular to an initial uplink synchronization method in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Background technique [0002] The Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system is based on Time Division Duplex (TDD) technology, which uses different time slots on the same frequency channel to receive and transmit data. [0003] The physical channel of TD-SCDMA includes three-layer structure: the first layer is radio frame, the second layer is subframe, and the third layer is time slot. Specifically, the physical channel is composed of several wireless frames, one wireless frame is 10ms, and each wireless frame is divided into two consecutive 5ms subframes, and each subframe includes seven business time slots and three special time slots . [0004] Such as figure 1 As shown, among the seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
Inventor 马继鹏丁国栋
Owner XIAOMI INC
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