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Method for acquiring propagation delay from physical random access channel

A technology of physical random access and propagation delay, applied in the field of WCDMA system, it can solve the problems of failure of mobile phone access, asynchronous dedicated channel, and inability to obtain propagation delay accurately, so as to prevent interference, ensure successful access, increase Effect of Correlation Integral Length

Inactive Publication Date: 2009-12-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention proposes a method for obtaining the propagation delay from the physical random access channel, so as to overcome the problems in the prior art that the propagation delay cannot be accurately obtained, which leads to the out-of-sync of the dedicated channel and the failure of mobile phone access

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  • Method for acquiring propagation delay from physical random access channel
  • Method for acquiring propagation delay from physical random access channel
  • Method for acquiring propagation delay from physical random access channel

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Embodiment Construction

[0021] The main technical idea of ​​the invention is to select the N multipaths with the largest energy to demodulate the message part of the random access information for the valid signature in the preamble detection, and accumulate the energy of the pilot symbols of the demodulated message part for each multipath , take the one-way delay of the air interface corresponding to the multipath with the largest demodulation energy as the propagation delay.

[0022] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] like figure 2 Shown is the corresponding relationship between Ec / Io and propagation delay error probability of the preamble in the prior art. Since the multipath with the largest correlation energy value is found from the preamble in the prior art to calculate the propagation delay, from the figure It can be seen that adopting this method will generate noise paths, which w...

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Abstract

This invention puts forward a method for getting time delay from a physical random access channel, which judges effective autograph from a precursor test and selects the message part of N multi-path demodulated random access information with greatest energy, then accumulates energies of pilot symbols of the demodulated message part and takes unilateral time delay of multi-path air interfaces with the greatest energy as the time delay, which not only increases related integral length greatly but also prevents interference of noise path.

Description

technical field [0001] The invention relates to a WCDMA system, in particular to a method for obtaining propagation time delay from a physical random access channel in a wideband code division multiple access system. Background technique [0002] In WCDMA (Wideband Code-Division Multiple-Access, wideband code division multiple access) mobile communication system, when the mobile phone initiates random access, NODEB (base station) will obtain from PRACH (PacketRandem Access Channel, physical random access channel) The one-way PropagationDelay (propagation delay) of the air interface, and report this propagation delay to the RNC (radio network controller). When a dedicated channel is subsequently established, the RNC can send the reported propagation delay value to the NODE B. [0003] If the dedicated channel establishment signaling issued by the RNC does not include the Propagation Delay parameter, when the NODEB demodulates the dedicated channel, it needs to configure a la...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04W74/08
CPCY02D30/70
Inventor 沈伟丁杰伟
Owner ZTE CORP