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Method for improving up synchronous transmission accuracy in TD SCDMA

A TD-SCDMA and synchronous transmission technology, which is applied in the field of improving the accuracy of uplink synchronous transmission, and can solve problems such as synchronization failure and inability to correctly receive UpPTS

Inactive Publication Date: 2007-04-18
VIMICRO CORP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, if the hardware delay of the UE is relatively large, the time when the UpPTS arrives at the base station is quite different from the required time, so that the base station will not be able to receive the UpPTS correctly, and eventually the uplink synchronization will fail.

Method used

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  • Method for improving up synchronous transmission accuracy in TD SCDMA
  • Method for improving up synchronous transmission accuracy in TD SCDMA
  • Method for improving up synchronous transmission accuracy in TD SCDMA

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] As shown in Figure 1, it is the communication flowchart that the present invention carries out uplink synchronization in TD-SCDMA system, comprises the following steps:

[0025] (101) The terminal estimates the path loss of spatial propagation according to the power of the downlink pilot time slot or the primary common control physical channel sent by the receiving base station, and calculates the spatial propagation delay value according to the path loss;

[0026] (102) The terminal takes out the pre-measured terminal hardware delay value stored in the terminal, and uses the sum of the terminal hardware delay value and the space propagation delay value as the time advance to transmit the uplink pilot time slot to the base station;

[0027] (103) After receiving the uplink pilot time slot sent by the terminal, the...

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Abstract

The invention discloses a method of improving uplink synchronous transmission accuracy in TD-SCDMA system, comprising the steps of: (1) terminal estimates space transmission path loss according to the received base station-transmitted downlink pilot frequency time gap or first common control physical channel power, and calculates space delay value according to the path loss; (2) the terminal extracts the pre-measured terminal hardware delay value stored inside, and transmits uplink pilot frequency time gap to the base station by using the sum of the terminal hardware delay value and the space transmission delay value as advanced time. Thus, it can assure the base station can accurately receive uplink pilot frequency time gap, improving uplink synchronous transmission accuracy in the TD-SCDMA system.

Description

technical field [0001] The invention relates to a method for improving the quality of uplink synchronous transmission, in particular to a method for improving the precision of uplink synchronous transmission in a TD-SCDMA system. Background technique [0002] TD-SCDMA (Time Division-Synchronization Code Division Multiple Access, Time Division Synchronization Code Division Multiple Access) requires strict uplink and downlink synchronization. Based on the above strict requirements, the base station needs the uplink signal of the mobile phone to reach the base station antenna at the specified time. There is a delay in the propagation of wireless signals in mobile phone hardware and space, so the mobile phone is required to transmit a certain period of time in advance, and this period of early transmission time is the time advance (TA) required for transmission. [0003] For the transmission signal of the mobile phone, it must first pass through the hardware part of the mobile p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B7/26
Inventor 郭为
Owner VIMICRO CORP
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