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Method and system for locating broadcast channel

A technology of broadcast channel and main broadcast channel, applied in wireless communication, communication between multiple stations, access restriction, etc., can solve problems such as no BCH location solution, poor channel estimation performance, etc.

Inactive Publication Date: 2008-02-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] 1. When the SCH is set in the first symbol of the subframe, the prior art does not give a specific solution on how to determine the position of the BCH
[0038] 2. When channel estimation is performed through the frame structure provided by the prior art, only reference signals can be used to estimate the BCH, and the obtained channel estimation performance is relatively poor

Method used

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  • Method and system for locating broadcast channel
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  • Method and system for locating broadcast channel

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Embodiment Construction

[0115] The first embodiment provided by the present invention is a method for realizing broadcast channel positioning, the core of which is: the sending end constructs a subframe, and when constructing a subframe, sets the synchronization channel in the last symbol of the subframe, and broadcasts The channel BCH is set in the adjacent symbols of the subframe where the synchronization channel SCH is located, and regardless of whether the subframe is a long CP subframe or a short CP subframe, the SCH symbol is added with a short CP length cyclic prefix; when the receiving end conducts cell search , use the subframe to locate the BCH.

[0116] The specific implementation process is shown in Figure 6, including the following steps:

[0117] Step S801, the sending end constructs a subframe, and when constructing a subframe, sets the SCH in the last symbol of the subframe, and sets the BCH in the time domain before the symbol where the SCH is located In one symbol, the SCH symbol i...

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PUM

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Abstract

The utility model discloses a method and system for realizing broadcasting channel location, which is characterized in that: when the transmitting end structures a sub frame, the synchronous channel SCH is positioned at the first symbol or the last symbol of the sub frame and the broadcast channel BCH is positioned at the adjacent symbol of the sub frame, to which the synchronous channel belongs; if the SCH is positioned at the first symbol of the sub frame, the cyclic prefix of the short CP length is added to the BCH symbol or the cyclic postfix of the short CP length is added to the SCH symbol; if the SCH is positioned at the last symbol of the sub frame, the cyclic prefix of the short CP length is added to the SCH; when doing cell searching, the receiving end utilizes the sub frame structure to locate the BCH. The utility model uses the SCH to provide the BCH with channel estimation; and as the SCH sequence is closer than the reference symbolic sequence in frequency domain, better channel estimation performance is obtained when using the SCH to provide the BCH with channel estimation rather than using the reference symbolic sequence.

Description

technical field [0001] The invention relates to the communication field, in particular to cell search technology. Background technique [0002] In a Long Term Evolution (LTE; Long Term Evolution) network, the cell search process performed by the UE at the receiving end includes the user terminal (UE; user equipment) completing downlink time-frequency synchronization (time synchronization and frequency synchronization) and UE capturing system information and cell specific information. information process. The process for UE to obtain time synchronization and frequency synchronization is completed through the synchronization channel (SCH; Synchronization Channel); the process for UE to obtain system information and cell-specific information is completed through SCH, broadcast channel (BCH; Broadcast Channel) or reference symbols. The cell-specific information obtained by the UE includes the following content: [0003] 1. Cell transmission bandwidth; [0004] 2. Cell identif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B7/26H04W48/16H04W64/00
Inventor 孙铭扬
Owner HUAWEI TECH CO LTD