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Uplink pilot signal transmitting method for satellite communication in TDD (time division duplex) or HFDD (half frequency division duplex) mode

A pilot signal and satellite communication technology, applied in the field of communications, can solve the problems of inability to receive uplink pilot signals, deviation of uplink signal reception time slots, etc., and achieve the effect of solving the problems of position deviation and uncertainty

Inactive Publication Date: 2011-06-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems existing in the prior art, aim at the satellite communication system of time division duplex or frequency division-time division duplex, provide a kind of sending method of initial uplink pilot signal, to solve the problem caused by the long time in satellite communication The uplink signal deviates from the receiving time slot due to characteristics such as delay and long delay difference, which leads to the problem that the uplink pilot signal cannot be received according to the usual time slot position

Method used

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  • Uplink pilot signal transmitting method for satellite communication in TDD (time division duplex) or HFDD (half frequency division duplex) mode
  • Uplink pilot signal transmitting method for satellite communication in TDD (time division duplex) or HFDD (half frequency division duplex) mode
  • Uplink pilot signal transmitting method for satellite communication in TDD (time division duplex) or HFDD (half frequency division duplex) mode

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Embodiment 1

[0056] In the following, firstly, in the time division duplex (TDD) mode, there are different uplink pilot transmission methods according to different available uplink signal area sizes.

[0057] Figure 10 It shows the situation that the uplink and downlink service time slots of TS1-TS6 are configured as 4:2. At this time, the available uplink signal area includes 4 normal time slots (TS1-TS4) plus guard interval GP and uplink pilot time slot UpPTS, and its width is 4×0.675+0.075+0.125=2.9ms, which is greater than twice the maximum transmission The basic wide time window interval requirement of 2.645 ms is the sum of the time delay difference and the width of one uplink pilot time slot. In this way, the uplink pilot signal can be sent within the sending window between 1.26 ms from the starting point of GP and 1.385 ms from the end point of TS4. For example, the uplink pilot signal can be placed in the TS2 time slot at a position 0.675-0.125=0.55 ms away from the left side o...

Embodiment 2

[0064] Secondly, in the frequency division-time division duplex (HFDD) mode, there are also different uplink pilot transmission methods according to different available downlink signal area sizes. In this way, since the satellite side uses a different frequency for reception, it can make full use of the blank interval corresponding to the downlink time slot on the reception frequency point to receive the uplink pilot signal, and can also avoid or reduce as much as possible. Interference of normal uplink business time slot signals.

[0065] Figure 12It shows the situation that the uplink and downlink service time slots of TS1-TS6 are configured as 3:3. At this time, the available downlink signal area includes 4 normal time slots (TS4-TS6, TS0 of the next signal frame) plus the downlink pilot time slot DwPTS of the next signal frame, the guard interval GP and the uplink pilot time slot UpPTS. The width is 4×0.675+2×0.075+0.125=2.975ms, which is greater than the basic wide tim...

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Abstract

The invention discloses an uplink pilot signal transmitting method for satellite communication in TDD (time division duplex) or HFDD (half frequency division duplex) mode, belonging to the field of communication technology, comprising: in TDD mode, transmitting an uplink pilot signal from the time 2X from the starting point of an available uplink signal area to the time (2X+Wup) from the ending point when the available uplink signal area is greater than or equal to Wmin; transmitting a first uplink pilot signal from the starting point to a transmitting window 1 (2X+Wup) from the ending point when the available uplink signal area is smaller than Wmin and greater than or equal to (2X+Wup); transmitting a second uplink pilot signal in a transmitting window 2 which is 2X from the starting point and Wup from the ending point, wherein Wmin =Wup+4X; in the HFDD mode, transmitting an uplink pilot signal from the time 2X from the starting point of an available downlink signal area to the time (2X+Wup) from the ending point when the available downlink signal area is greater than or equal to Wmin; and transmitting an uplink pilot signal in the available downlink signal area or a signal framewhen the available downlink signal area is smaller than Wmin. The invention is applied to a satellite communication system.

Description

technical field [0001] The invention relates to satellite communication technology, in particular to a method for sending an initial uplink pilot signal in a time division duplex (TDD) and frequency division-time division duplex (HFDD) mode satellite communication system, and belongs to the field of communication technology. Background technique [0002] Uplink pilot synchronization is an important link in the network access process of user terminals in the 3rd and 4th generation TDD mode ground mobile communication systems. The third-generation TDD mode ground mobile communication standard TD-SCDMA and its long-term evolution standard TD-LTE both use special time slots such as UpPTS for initial uplink pilot transmission. Among them, the frame structure of TD-SCDMA standard is as follows: figure 1 shown. [3GPP TS 25.221 V4.8.0 (2005-06) "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04B7/26H04W84/06
CPCH04B7/18513
Inventor 吴建军程宇新任术波徐晓燕栾西
Owner PEKING UNIV