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Transmitting method of random accessed signal in the wireless communication system

A random access signal and wireless communication system technology, applied in the field of mobile communication, can solve problems affecting the working efficiency of the RACH coverage system, achieve the effect of improving coverage, improving work efficiency, and ensuring success rate

Active Publication Date: 2008-07-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For the transmission of RACH in UpPTS, its structure and transmission method are a problem to be solved. If the design is not proper, it will seriously affect the coverage of RACH and the working efficiency of the entire system

Method used

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  • Transmitting method of random accessed signal in the wireless communication system
  • Transmitting method of random accessed signal in the wireless communication system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0049] As shown in Figure 3, the RACH channel structure of the present embodiment does not add CP before preamble, namely Tcp=0*Ts, the length of preamble is the length of 2 OFDM (orthogonal frequency division multiplexing) symbols without CP, The length of each OFDM symbol is Tpre / 2 (133.33us / 2), that is, Tpre=4096×Ts, where Ts=1 / 30.72us.

[0050] The sending time of the RACH signal can be determined in the following two ways:

[0051] A, the terminal can send the RACH signal at the position n×Ts ahead of the end position of the UpPTS, where n×Ts is the length of the UpPTS;

[0052] B. The terminal can send the RACH signal at a position m×Ts earlier than the end position of the UpPTS, where m×Ts is the sum of lengths of symbols (with CP) in the UpPTS occupied by the RACH channel. The length depends on the number and types of OFDM symbols occupied in the UpPTS. The symbol of the long CP is 512+2048=2560Ts, the symbol of the first type of short CP is 144+2048=2192Ts, and the ...

example 1

[0055] No CP is added before the preamble, that is, Tcp=0×Ts, and the length of the preamble is the length of two OFDM symbols without CP, that is, Tpre=4096×Ts, where Ts=1 / 30.72us

[0056] When the length of the UpPTS is 4400×Ts, the RACH signal is sent 4400×Ts ahead of the end of the UpPTS.

example 2

[0058] No CP is added before the preamble, that is, Tcp=0×Ts, and the length of the preamble is the length of two OFDM symbols without CP, that is, Tpre=4096×Ts, where Ts=1 / 30.72us

[0059] When the length of the UpPTS is 4384×Ts, the RACH signal is sent 4384×Ts ahead of the end of the UpPTS.

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Abstract

The invention provides a sending method of a random access signal in a wireless communication system. A terminal sends the random access signal in advance at an ending location of an uplink pilot frequency time slot; the sent random access signal comprises a preamble or comprises the preamble and a cycle prefix at the same time; the length of the preamble is the length of 2 characters without cycle prefix. The invention effectively expands the coverage scope of the random access channel.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for sending random signals in a wireless communication system. Background technique [0002] Fig. 1 shows the frame structure of LTE (Long Term Evolution, long-term evolution) system TDD (TimeDivision Duplex, time division duplex) mode, in this frame structure, a 10ms radio frame (wireless frame) is divided into two half Frame (half frame), each half frame is divided into 10 time slots (numbered from 0 to 9) with a length of 0.5ms, and two time slots form a subframe with a length of 1ms. One field contains 5 subframes (numbered from 0 to 4). For short CP (Cyclic Prefix, cyclic prefix) with a length of 5.21us and 4.69us, a time slot contains 7 symbols with a length of 66.7us, of which the length of the first symbol CP is 5.21us, and the CP length of the remaining 6 symbols It is 4.69us; for a long CP with a length of 16.67us, one time slot contains 6 symbols. In thi...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04B7/26H04B1/707H04W74/00H04W74/08
CPCH04L5/0053H04L5/0062H04L5/1469H04L27/2602H04L27/2607H04W74/002H04W74/0866H04J3/1694H04W74/0833
Inventor 郝鹏喻斌夏树强梁春丽戴博
Owner ZTE CORP
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