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Correction method of time parameter after CDMA terminal hard switched

A technology of time parameters and correction methods, which is applied in the direction of communication between multiple stations, selection devices, electrical components, etc., to achieve the effect of reducing the drop rate

Inactive Publication Date: 2004-03-03
ZHEJIANG HUALI COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soft handover can only be used when adjacent CDMA bands have the same frequency allocation, it has the difference of forward traffic channel and backward traffic channel at the base station boundary

Method used

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  • Correction method of time parameter after CDMA terminal hard switched
  • Correction method of time parameter after CDMA terminal hard switched

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Experimental program
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Embodiment Construction

[0008] figure 1 It is a block diagram of a mobile station (terminal) receiver. A block diagram of fhe mobilestation receiver is shown in Figure l. The searcher hardware provides control support for the Mcontroller as well as signal strength measurements. Mcontroller is used to control the whole system, including data demodulator and modulator. In order to maintain the system time, the mobile station (terminal station) has an 18-bit register called Master Timer, which stores the earliest available multi-channel signal arrival time with the accuracy of 1 / 8 data block time. This register is an uninterrupted correction register, which is corrected 8 times in each data time, and the time parameter correction is carried out by Mcontroller writing Master Timer.

[0009] The hard handover will be triggered when the current serving base station sends an extended handover instruction message to the mobile station (terminal). This information includes the channel, PN offset, and frame...

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Abstract

Extended switching indication information sent by present service station to mobile station (terminal) trigs hard switching. In hard switching, time parameter correction is carried out before communication between mobile station (terminal) and new base station is continued. Since time parameter is corrected, rate of interrupted communication caused by hard switching is reduced greatly. Thus, the invention solves technical problems obtains technical effect, economic benefit and social benefit.

Description

Technical field: [0001] The invention relates to a time parameter correction of a mobile station terminal after a hard handover, and is mainly used for a CDMA mobile station terminal. Background technique: [0002] In CDMA1 and CDMA2000 standards, each base station will continuously send non-data-modulated direct sequence signals in the control channel. This signal is composed of a data block stream (CHIP), and the maximum length of each data block is a PN (pseudo-noise) sequence (the period of each sequence is 2 15 ). The control channel is identified by a length interval of 64 data blocks compared with the 0 offset control (PN) sequence. In addition to providing a reference phase for coherent demodulation, the control signal can also enable the mobile station (terminal) to obtain and maintain forward data The timing of the link, and the determination of the strength of the base station signal to switch in a timely manner. [0003] In the above-mentioned CDMA standard, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04B7/26H04J13/02
Inventor 汪力成高东杨
Owner ZHEJIANG HUALI COMM TECH
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