Method for acquiring propagation delay from physical random access signal channel

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...

AI Technical Summary

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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