Method and terminals for quick log on base station in synchronous CDMA system

A synchronous code division multiple access, terminal technology, applied in code division multiplexing system, communication between multiple stations, multiplexing communication, etc. Login failure and other problems, to solve the problem of login efficiency, improve the login speed, and speed up the time

Inactive Publication Date: 2003-11-19
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. In the process of finding available frequency points, it is necessary to adjust the receiving gain (GAIN value) many times, which consumes a lot of time and makes the search efficiency not high
[0008] 2. Before entering the login process, it is not verified whether the position of the synchronization head is the base station. Therefore, if there is a terminal that is talking nearby, it may cause a wrong judgment and cause login failure

Method used

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  • Method and terminals for quick log on base station in synchronous CDMA system
  • Method and terminals for quick log on base station in synchronous CDMA system
  • Method and terminals for quick log on base station in synchronous CDMA system

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Embodiment Construction

[0061] Figure 4 It is the signaling structure of the SCDMA system, which illustrates the time relationship of the time division duplex of the SCDMA system, where WBS represents the base station, and UT represents the terminal.

[0062] It can be seen that in a period of 10 ms, the terminal and the base station transmit signals in turn, the base station transmits the signal at the 5ms time shown by the label 41, and the terminal transmits the signal at the 5ms time shown by the label 42, wherein, in the process of transmitting and receiving conversion Among them, there are 4 symbols (symbol) when the terminal and the base station do not transmit, which is called Guard Time (Guard Time), also known as Guard Band (Guard Band) 43, which is a synchronization header used to establish synchronization. When there is no user talking , the power of the sync header signal composed of 4 symbols in the WBS Tx is the highest.

[0063] To increase the login speed, the key is to improve the...

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Abstract

The invented method includes the frequency sweep procedure, which is for establishing a working frequency point for communication between a terminal and a base station, and the synchronization procedure for building the synchronization at the working frequency point for terminals to begin log on. In the frequency sweep procedure, the terminal using a fixed value of receiving gain does not carry out multiple adjustmkents for value of receiving gain. Instead, the signal in the downgoing synchronization head from the base station or the signal in upgoing synchronization head from other users are utilized to determine the available frequency so as to speed up the time for searching available frequency point greatly making quick logging on become possible.

Description

technical field [0001] The invention relates to a method for communicating between a terminal and a base station in a synchronous code division multiple access system (SCDMA), in particular to a method for quickly logging in a terminal to a base station. Background technique [0002] Such as figure 1 As shown, it is a module structure diagram of an existing SCDMA terminal (mobile phone). The terminal receives a signal from the base station through the antenna 11, or sends a signal to the base station. The received signal first passes through a filter, and a receiving channel, wherein the receiving channel The value of the receiving gain GAIN can be changed by the receiving gain controller 15, in order to achieve the best receiving effect, the received signal is converted into a digital signal that can be processed by the terminal circuit through the A / D converter 17, and then passes through the demodulation module 19 , to get the real information and facilitate further proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/18H04B7/26
Inventor 李日光蒋伯峰朱宁林波
Owner BEIJING XINWEI TELECOM TECH
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