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Physical accidental access channel mapping method

A technology of physical random access and mapping method, applied in wireless communication, communication between multiple stations, electrical components, etc., can solve the problem of uneven distribution of PRACH time

Inactive Publication Date: 2013-01-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to provide a physical random access channel mapping method to solve the problem of uneven time distribution of PRACH processed by the same base station in the prior art

Method used

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  • Physical accidental access channel mapping method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] Assume that the density of PRACH is D (D=0.5, 1, 2, 3, 5, 10 PRACH / 10ms); the number of versions is R; the number is The index of the PRACH available in a certain cell in a random access period is d (which may be called the PRACH index or density index in the cell, The version number is r(r∈[0, R-1]); the number of downlink to uplink switching points in a 10ms wireless frame is N SP ; The number of PRACHs in a certain format that can be accommodated in the time domain within a half frame is N RA HF (i).

[0164] ●PRACH number: When numbering, first increment the density index, and then increment the version number, that is in r ∈ [0, R-1];

[0165] ●Time Domain Mapping

[0166] Radio Frame Mapping

[0167] When D=0.5 PRACH / 10ms

[0168] N ind RA (or r) even-numbered PRACHs are mapped to even-numbered radio frames, and odd-numbered PRACHs are mapped to odd-numbered radio frames;

[0169] When D>0.5 PRACH / 10ms

[0170] All PRACHs are mapped to each...

Embodiment 2

[0196] Assume that the density of PRACH is D (D=0.5, 1, 2, 3, 5, 10 PRACH / 10ms); the number of versions is R; the number is The index of the PRACH available in a certain cell in a random access period is d (which may be called the PRACH index or density index in the cell, ); the version number is r(r∈[0, R-1]); the number of transition points from downlink to uplink in a 10ms wireless frame is N SP ; The number of PRACHs in a certain format that can be accommodated in the time domain within a half frame is N RA HF (i).

[0197] ●PRACH number: When numbering, first increment the density index, and then increment the version number, that is in r ∈ [0, R-1];

[0198] ●Time Domain Mapping

[0199] Radio Frame Mapping

[0200] When D=0.5 PRACH / 10ms

[0201] N ind RA (or r) even-numbered PRACHs are mapped to even-numbered radio frames, and odd-numbered PRACHs are mapped to odd-numbered radio frames;

[0202] When D>0.5 PRACH / 10ms

[0203] All PRACHs are mappe...

Embodiment 3

[0227] Assume that the density of PRACH is D (D=0.5, 1, 2, 3, 5, 10 PRACH / 10ms); the number of versions is R; the number is The index of the PRACH available in a certain cell in a random access period is d (which may be called the PRACH index or density index in the cell, The version number is r(r∈[0, R-1]); the number of downlink to uplink switching points in a 10ms wireless frame is N SP; The number of PRACHs in a certain format that can be accommodated in the time domain within a half frame is N RA HF (i).

[0228] ●PRACH number: When numbering, first increment the version number, and then increment the density index, that is N ind RA = dR + r , in r ∈ [0, R-1];

[0229] ●Time Domain Mapping

[0230] Radio Frame Mapping

[0231] When D=0.5 PRACH / 10ms

[0232] N ind RA (or r) even-numbered PRACHs are mapped to even-numbered radio frames, and odd-number...

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Abstract

The invention provides a mapping method of physical random access channel, which includes steps as follows: getting density and edition number of physical random access channel; constructing density index according with density and getting edition number; constructing physical random access channel number using density index and edition number. The method can distribute evenly PRACH processed by same base station in time, and can reduce small district interference of second kind PRACH furthest.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method for mapping physical random access channels. Background technique [0002] The frame structure of LTE system TDD (Time Division Duplex, time division duplex) mode is as follows figure 1 shown. In this frame structure, a 10ms (307200Ts, 1ms=30720Ts) wireless frame is divided into two half-frames, each half-frame is 5ms long (153600Ts), including 8 common time slots with a length of 0.5ms, and three A special time slot, namely DwPTS (Downlink Pilot Time Slot, downlink pilot time slot), GP (Guard Period, guard interval) UpPTS (Uplink Pilot Time Slot, uplink pilot time slot), and the length of these three special time slots The sum is 1ms (30720Ts). Subframe 1 always consists of three special time slots; when there are 2 downlink-to-uplink transition points within 10ms, subframe 6 consists of three special time slots; in other cases, subframe 6 only contains DwPTS (D...

Claims

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Application Information

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