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Synchronous channel framing method for CDMA mobile communication system

A technology of mobile communication system and synchronous channel, which is applied in the field of synchronous channel framing, and can solve problems such as system real-time impact

Inactive Publication Date: 2008-09-03
EASTERN COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the processor Motorola MPC860 commonly used in communication equipment, the actual measurement can be obtained: the time required for steps (1) and (2) is less, about tens of microseconds; and the time required for step (3) is as long as 2 to 3 milliseconds, in this case, because it takes up more CPU (central processing unit) resources, it will have a greater impact on the real-time performance of the system. Especially for multi-sector systems, due to the existence of multiple synchronization channels, This effect is getting worse

Method used

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Experimental program
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Embodiment Construction

[0017] In the CDMA mobile communication system synchronous channel framing method of the present invention, the long code state calculation step and the cyclic redundancy code check bit calculation step in the CDMA mobile communication system synchronous channel framing operation are set as an independent execution process, and the synchronous channel The framing step of the superframe is divided into multiple independent execution processes, and the execution moments of the multiple independent execution processes correspond to different moments in the time length of a synchronization channel superframe respectively, and the number is an integer M;

[0018] The system generates an initial offset value RandOffsets at the time of framing through a random function every certain operation period;

[0019] Assign a synchronization channel index value SyncIndex to each synchronization channel, and the value is an integer starting from 0; calculate the framing time T for each synchro...

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Abstract

This invention discloses a method for CDMA mobile communication system synchronous channel framing which is to design the long code status computing step and circulation redundant code check bit computing step as an independent executing process, to divide the superframe framing steps to multiple independent, executing process executing time scale of which is corresponding to different time scales in a synchronous channel superframe time length, the number is integer M. The system decides framing time scale point by random function and carries out corresponding framing operation avoiding centralized occupation to CPU resource.

Description

technical field [0001] This specification relates to CDMA (Code Division Multiple Access) mobile communication technology, and in particular to the synchronous channel framing method in the CDMA mobile communication system. Background technique [0002] The mobile communication system constructed based on the CDMA technology proposed by Qualcomm Corporation of the United States is generally divided into two basic parts, namely terminal equipment and system equipment. Terminal equipment usually refers to mobile phone equipment, called MS (Mobile Station); system equipment usually refers to base station system, called BSS (BaseStation System). [0003] The synchronization channel is a spread spectrum signal sent by the CDMA base station system. It is continuously sent by the BSS and received by the MS. It is used for MSs working in the coverage area to obtain initial time synchronization. The rate of the isochronous channel is 1200bps (bits per second), the length of one isoc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02H04Q7/20H04B7/26H04W80/00
Inventor 曹昊嘉陈国景
Owner EASTERN COMM