Terminal preamble sending method in time division duplexing system

A time-division duplex system and terminal technology, which is applied in the direction of transmission system, electrical components, radio/inductive link selection arrangement, etc., can solve the problems of long protection time and short coverage of RACH channel, and achieve the effect of large coverage

Inactive Publication Date: 2009-03-25
ZTE CORP
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Problems solved by technology

From the above analysis, it can be seen that since the first method needs to reserve the longest protection time, which is 4R / C, so at T p with T RA Under certain conditions (that is, the total length of the guard time is certain), use this method to determine the starting point of the preamble, and the coverage of the RACH channel is the shortest

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  • Terminal preamble sending method in time division duplexing system
  • Terminal preamble sending method in time division duplexing system
  • Terminal preamble sending method in time division duplexing system

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Embodiment Construction

[0033] This embodiment takes the second type of frame structure of LTE as an example. When setting the guard time, the following two conditions should be met at first: first, the preamble of a certain terminal received at the base station side does not match the preamble of other terminals behind the RACH time slot. The uplink data subframe generates interference; secondly, the terminal's preamble is not interfered by the DwPTS signals of other terminals in the cell base station of the first layer.

[0034] The method to determine the sending time of the terminal preamble is as follows Figure 5 shown, including the following steps:

[0035] Step 501, according to the distance to the base station, the cell is divided into N circular or annular areas from near to far, and the difference between the furthest distance and the shortest distance from each area to the base station (hereinafter also referred to as the span of the area) is equal ;

[0036] Taking the terminal in are...

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Abstract

The invention discloses a sending method of terminal front in a time division duplexing system. An RACH channel only requires less guard time to reach the coverage area of the RACH channel. The method comprises the following steps: firstly, when a system is configured, determining the total guard time TGT of the random access RACH channel, and dividing a cell into a plurality of circular or annular areas according to the distance between the cell and a base station; secondly, when the front is sent by a terminal, judging the area of the terminal, and determining the front sending time corresponding to the area; and thirdly, sending the front by using the terminal at the determined sending time. By adopting the method, the method for sending the starting point of a preamble at a terminal side is determined according to the position range of the terminal in the cell; and the larger coverage area can be supported under the condition that the total length of the guard time is definite without estimating the distance between the range and the base station accurately.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a method for determining terminal signal sending time in a TDD (Time Division Duplex, Time Division Duplex) system. Background technique [0002] The LTE (Long Term Evolution, long-term evolution) system defines two types of frame structures, wherein the second type of frame structure (such as figure 1 Shown) corresponds to the long-term evolution of TD-SCDMA, using TDD mode. In the second type of frame structure, each wireless frame consists of two half frames (half frame), and each half frame is divided into several subframes (subframes), of which subframe 0 (subframe 0) is fixed to transmit downlink data; The first n subframes in subframes 1-6 are used to transmit uplink data, and the last 6-n subframes are used to transmit downlink data (1≤n≤6). The special time slot DwPTS (Downlink Pilot Time Slot, downlink pilot time slot ) is used to transmit downlink synchronization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/36H04B1/69
Inventor 郝鹏郁光辉张禹强戴谦
Owner ZTE CORP
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