Method for automatic PN planning in CDMA network

Abstract

The present invention discloses an automatic PN programming method in a CDMA network. The method comprises the steps of setting PN programming area, setting sectors participating in the PN programming and the parameters, constraint factors, conditions and programming mode thereof, and PN programming iteration number threshold value; iterating the PN programming according to the setting, calculating to obtain the pilot frequency intensity and the path time delay from each grid to each sector participating in the PN programming in the programming area; calculating to obtain all the PN distribution priorities to be distributed and distributing the PN with the highest priority to the station or sector with the highest priority; calculating to obtain the maximum interference power coefficient,judging that if PN interference occurs after the PN distribution, and outputting PN programming result, calculating and outputting PN distribution quality if PN interference occurs; if no PN interference occurs, comparing the PN programming number with the set threshold value, and if the PN programming iteration is smaller than the set threshold value, increasing the minimum same PN multiplex threshold distance, or else, outputting PN programming result, calculating and outputting PN distribution quality. According to the present invention, reasonable automatic PN programming in a network is realized.

Description

technical field [0001] The invention relates to a method for automatic PN (Pseudorandom Noise, pilot) planning in a Code Division Multiple Access (CDMA, Code Division Multiple Access) system. Background technique [0002] CDMA communication network is a digital spread spectrum communication system. The forward channel of its system includes pilot channel, synchronization channel, paging channel, traffic channel, etc., which are used for communication from the base station side to the terminal side. The forward channel is firstly spread by Walsh function, and then orthogonally modulated by PN short code. [0003] The PN short code in the CDMA system is generated by two sets of PN sequences——I sequence and Q sequence orthogonally. The I-sequence and Q-sequence pilots are m-sequences generated by a 15th-order shift register, and each cycle inserts an all-zero sequence at a specific position of the pilot sequence, making its cycle 2 15 . Different base stations use m-sequenc...

AI Technical Summary

Problems solved by technology

[0011] The technical problem solved by the present invention is to provide a method for automatic PN planning in a CDMA network, so as to solve the problems of heavy workload and difficult guarantee of planning quality in manual PN planning; Supports same-site PN assignment rules, excessive constraints on adjacent PN assignments, does not consider propagation delay, and does not support the analysis of existing network PN assignment quality, etc.

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