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Method and system for obtaining frequency bias in high speed shrouding scene

An acquisition method and acquisition system technology, applied in the field of frequency offset acquisition in high-speed coverage scenarios, can solve the problems of system capacity and performance impact, cell frequency offset convergence, and long uplink synchronization time and time

Inactive Publication Date: 2009-08-19
深圳市恒程汇文化科技有限公司
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AI Technical Summary

Problems solved by technology

Since the frequency offset compensation and multipath update of the Rake receiver are carried out at a certain period, the time from the frequency offset estimation to the frequency offset compensation of the Rake receiver is relatively long. During this period, when the frequency offset of the dedicated channel When the frequency offset is relatively large, the frequency offset convergence and uplink synchronization time of the cell will be relatively long. Moreover, during the long-term uplink synchronization process, the mobile terminal will send a higher-power signal, thereby introducing more uplink interference. The capacity and performance of the system has a great impact

Method used

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  • Method and system for obtaining frequency bias in high speed shrouding scene
  • Method and system for obtaining frequency bias in high speed shrouding scene

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Embodiment Construction

[0031] The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0032] In a WCDMA mobile communication system, when a mobile terminal initiates random access, Node B will obtain the one-way propagation delay of the air interface from the Physical Random Access Channel (PRACH, Physical Random Access Channel), represented by the field Propagation Delay, And report the value of the one-way propagation delay to the RNC; when establishing a dedicated channel subsequently, the RNC sends the value of the reported one-way propagation delay to the Node B, and the Node B establishes a dedicated channel based on the one-way propagation delay. channel.

[0033] 3GPP TS 25.433 stipulates that the one-way propagation delay, that is, the value range of the Propagation Delay field is: 0~255, and the unit is 3 chips (chips), that is, the value range is: 0~765chips, and can carry up to 8 bits of i...

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Abstract

The invention discloses a method for obtaining frequency swing in high speed covering scene and a system thereof. The method includes steps as follows: a mobile terminal sending a random access course, a base station (Node B) obtaining frequency swing information through a physical random access channel (PRACH) and encapsulating the frequency swing information in an extended propagation delay field, and sending to a radio network controller (RNC); Node B extracting the frequency swing information from the Extended Propagatiom Delay field carrying with the frequency swing information sent by RNC after completing the random access course. The method and the system can shorten time for obtaining the frequency swing information.

Description

technical field [0001] The invention relates to the technical field of channel frequency offset acquisition in a Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access) mobile communication system, in particular to a frequency offset acquisition method and system in a high-speed coverage scenario. Background technique [0002] In a mobile communication system, there is a relative velocity between the signal transmitting end and the signal receiving end, resulting in Doppler frequency deviation. In the high-speed mobile communication scenario, the maximum frequency deviation range may be -1500~1500HZ, and may even reach -1800~1800HZ. In high-speed coverage scenarios, such as high-speed railway coverage scenarios, when the train speed is 350 km / h and the carrier frequency is 1.95 GHz, the maximum Doppler frequency deviation at the signal receiving end can reach 1264 Hz. Frequency changes will cause channel fading, especially when the frequency d...

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Application Information

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IPC IPC(8): H04W74/08H04B1/707
CPCH04W74/0833H04W74/008
Inventor 沈伟
Owner 深圳市恒程汇文化科技有限公司
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