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Method and apparatus for obtaining propagation delay from physical stochastic access channel

A technology of physical random access and propagation delay, which is applied in the transmission system, radio transmission system, communication between multiple stations, etc.

Inactive Publication Date: 2012-07-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Considering the problem that the accurate propagation time delay exists in the prior art, the present invention is proposed. Therefore, the present invention aims to provide a physical random Method and device for accessing channel to obtain propagation delay

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  • Method and apparatus for obtaining propagation delay from physical stochastic access channel
  • Method and apparatus for obtaining propagation delay from physical stochastic access channel
  • Method and apparatus for obtaining propagation delay from physical stochastic access channel

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Embodiment Construction

[0020] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0021] Before describing the embodiment of the present invention, first introduce the frame structure of the physical random access channel, such as figure 2 As shown, the physical random access channel is divided into a preamble part and a message part. The length of the preamble part is 4096 chips, and the length of the message part is one frame or two frames. Each frame has 15 time slots, and each time slot is 2560 chips.

[0022] In the embodiment of the present invention, for the valid signature in the preamble detection, N multipath demodulation random access messages with the largest energy are selected, and the energy of each pilot symbol in the demodulated ...

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Abstract

The invention discloses a method and a device for obtaining propagation delay from a physical random access channel, wherein, the method comprises the following treatments: Node B descrambles an input signal, the relevant energy value of different delay positions of each signature is obtained by predefined processing; in random access preamble detection, demodulation random access information with the largest energy of N multipaths is selected for the signature which is judged to be valid; the demodulation energy of each pilot symbol in the information control parts of M frames of informationafter demodulation is respectively accumulated for the N multipath, wherein, M equals to 1 or 2; air interface one-way delay corresponding to the multipath with the largest demodulation energy in theN multipath is selected as the propagation delay which is reported to a radio network controller. The invention can effectively prevent the interference of a noise path and avoid the occurrence of the situation that the energy of the noise path exceeds that of a real path, thus solving the problem that the reported propagation delay is not accurate.

Description

technical field [0001] The invention relates to a wideband code division multiple access (WCDMA, Wideband Code-Division Multiple-Access) communication system, in particular to a method and a device for obtaining propagation time delay from a physical random access channel in the wideband code division multiple access system. Background technique [0002] In the wideband code division multiple access (WCDMA) mobile communication system, when the mobile phone initiates random access, the base station (Node B) will obtain the one-way propagation delay (Propagation Delay) of the air interface from the physical random access channel (PRACH). ), and report the propagation delay to the Radio Network Controller (RNC, Radio Network Controller), and when the dedicated channel is subsequently established, the RNC can send the reported propagation delay value to the Node B as required. [0003] If there is no propagation delay (Propagation Delay) parameter in the dedicated channel estab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04B7/216H04B7/26
Inventor 沈伟丁杰伟
Owner ZTE CORP