A cell search method and device for narrowband assisted broadband

A cell search and narrowband technology, which is applied in the communication field, can solve the problems of large amount of related processing calculations, large blind detection range, and aggravated cell search calculations.

Active Publication Date: 2021-01-19
HYTERA COMM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, due to the wide operating frequency band supported by the terminal and the large number of frequency points to be scanned, the blind detection range is large, the amount of calculation is large, and the time is long.
In addition, the terminal uses a total of 3 PSS sequences and a total of 168 SSS sequences, and the calculation amount of related processing is very large, which further aggravates the problem of large amount of calculation and long time for cell search

Method used

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  • A cell search method and device for narrowband assisted broadband
  • A cell search method and device for narrowband assisted broadband
  • A cell search method and device for narrowband assisted broadband

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0107] Example 1, the broadcast message delivered by the narrowband system carries the working frequency band index (Band 33) of the broadband system within its coverage. The terminal demodulates the working frequency band index from the narrowband broadcast message, and determines the working frequency band of the broadband system as 1900MHz-1920MHz according to the index; assuming that the terminal itself supports frequency bands 33, 38 (2570MHz-2620MHz) and 40 (2300MHz- 2400MHz), however, using the first implementation method, the terminal directly scans for signals within 1900MHz-1920MHz without a full scan, that is, the terminal no longer needs to scan in all the frequency bands it supports, thus reducing the frequency of scanning range, which reduces the amount of subsequent calculations.

[0108] The second implementation of step 102 is that the cell information of the broadband system includes: a cell identifier; and the terminal searches for a cell of the broadband sy...

example 2

[0114] Example 2, the broadcast message delivered by the narrowband system carries the cell identifiers of the broadband systems within its coverage (here set as 48, 51, 54, 57, 60, 63). The terminal demodulates these cell identities from the narrowband broadcast message, and then calculates possible cell group numbers N1={0} and possible cell group numbers N2={16,17,18,19 from these cell identities ,20,21}; From the number in the group to 0, you can look up the table to get the root serial number Generate a local PSS sequence based on this value, perform sliding correlation with the scanned sequence, find the maximum point of the correlation peak, and the position of the maximum point is the timing position; then the local SSS sequence can be generated from the group number and the group number in the set N2, and the Each SSS is slidingly correlated with the received sequence, and the maximum point of the correlation peak is found, corresponding to the position of the maximu...

example 3

[0121] Example 3, the broadcast message issued by the narrowband system carries the working frequency band index (Band 33) of the broadband system within its coverage and the cell identity of the broadband system (here set as 48, 51, 54, 57, 60, 63) . The terminal demodulates the working frequency band index and cell ID from the narrowband broadcast message, and determines the working frequency band of the broadband system as 1900MHz-1920MHz according to the index; assuming that the terminal itself supports frequency band 33, frequency band 38 (2570MHz-2620MHz) and frequency band 40 (2300MHz-2400MHz), however, using the third implementation method, the terminal directly scans for signals within 1900MHz-1920MHz without the need for a full scan, that is, the terminal no longer needs to scan in all the frequency bands it supports, thus The scanning range is reduced, which also reduces the amount of subsequent calculations. In addition, the terminal can calculate the possible cel...

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PUM

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Abstract

The invention provides a cell search method and device of a narrowband auxiliary broadband, wherein the method comprises the steps that a terminal receives a broadcast message sent by a narrowband system, wherein the broadcast message carries cell information of a broadband system in a covering range of the narrowband system; the terminal performs cell search of the broadband system according to the cell information of the broadband system. The narrowband system issues the broadcast message carrying the cell information of the broadband system in the covering range, so that the terminal is assisted to know the cell information of the broadband system; further, the cell search of the broadband system is performed in a targeted way, so that the scanning range can be reduced; the operation quantity is reduced; the cell search speed is accelerated.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a cell search method and device for narrowband assisting wideband. Background technique [0002] Currently, in the broadband system LTE (Long Term Evolution, Long Term Evolution), to access LTE, UE (User Equipment) must go through processes such as cell search, cell system information acquisition, and random access. Among them, the main purpose of the cell search: 1. Obtain frequency and symbol synchronization with the cell; 2. Obtain the starting position of the system frame; 3. Determine the cell identity. [0003] UE not only needs to perform cell search when it is turned on, but in order to support mobility, UE will continuously search for neighboring cells, obtain synchronization and estimate the reception quality of the cells signal, so as to decide whether to perform handover. [0004] The cell ID (CELL ID) in the LTE system defines 504 possible values, ran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W48/16
CPCH04W48/16
Inventor 洪晨鲁志兵陈宏王志国汪嘉文
Owner HYTERA COMM CORP
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