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Method and apparatus for ranking ZC sequence of accidental access channel

A random access channel and sequence sorting technology, applied in the field of communication, can solve the problems of lack of ZC sequence sorting, different coverage areas, etc.

Inactive Publication Date: 2012-05-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to provide a ZC sequence sorting method and device to solve the above-mentioned lack of ZC sequence sorting in the prior art, resulting in different coverage of UEs using different ZC sequences in the same cell

Method used

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  • Method and apparatus for ranking ZC sequence of accidental access channel
  • Method and apparatus for ranking ZC sequence of accidental access channel
  • Method and apparatus for ranking ZC sequence of accidental access channel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] The ZC sequence length N used by the random access channel is 139, the number of available sequences is 138, and W=P=0, Q=56 are set.

[0104] Then, for α=0, 1, 2, ..., 137, the obtained mapping relationship will degenerate into

[0105] if 0≤α

[0106] u = α / 2 + 1 , ifα mod 2 = 0 N - α + 1 2 , ifα mod 2 = 1 ...

Embodiment 2

[0126] The ZC sequence length N used by the random access channel is 139, the number of available sequences is 138, and W=30, P=24, and Q=56 are set.

[0127] Then, for α=0, 1, 2, ..., 137, the obtained mapping relationship will degenerate to:

[0128] if 0≤α

[0129] u = α / 2 + 1 , ifα mod 2 = 0 N - α + 1 2 , ifα mod 2 = ...

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Abstract

The invention provides a ZC sequence ranking method and a device for randomly accessing in channels, the method comprises the following steps: setting alpha to be logical index for each strip of ZC sequence, setting mu to be physical index of each strip of ZC sequence, wherein 1<=mu<=N-1, 0<=alpha<=N-2, and N is the length of each strip of ZC sequence, and establishing mapping relationship between the logical index and the physical index. The invention guarantees that PRACH of a cell phone which utilizes different sequences in a district has close coverage range, thereby improving the flexibility of district planning.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a ZC sequence sorting method and device for a random access channel. Background technique [0002] In the Long Term Evolution (LTE for short) system, the Random Access Channel (RACH for short) uses the cyclic shift sequence of the Zadoff-Chu (ZC for short) sequence as the preamble, and the cyclic shift The sequence may also be called a Zero Correlation Zone (ZCZ for short) sequence. [0003] In an actual system, a user equipment (User Equipment, referred to as UE) such as a mobile phone first performs downlink synchronization after being turned on, and then starts to detect a broadcast channel (Broadcast Channel, referred to as BCH). The base station notifies the mobile phone of the logical index (Logical root sequence number) of the first ZC sequence that can be used by the RACH of the cell and the step size of the cyclic shift through the BCH, and the mobile phone calcula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04W74/08
Inventor 郝鹏夏树强戴博梁春丽喻斌
Owner ZTE CORP