Method and apparatus for detecting co-PN interference in CDMA system

Abstract

The invention discloses a detecting method of same PN interference in code division multiple access systems, comprising: an operation maintenance center counts handoff relation of each sector in the system, according to neighbouring area list and the handoff relation, divides the statistical result including sector unique identification information into two types: in a certain period, collecting and recording statistical results of each sector handoff relation; according to appearance of PN codes, screening statistical results of each sector; utilizing sector unique identification informationto search a different sector corresponding to the selected PN code and displaying statistical results. Moreover, the invention also discloses a detecting device of same PN interference in code division multiple access systems. An interference problem caused by too small PN reusing distance can be distinguished through the invention which is convenient to maintenance.

Description

technical field [0001] The present invention relates to the field of communication, and in particular, to a method and device for detecting co-PN interference in a Code Division Multiple Access (CDMA) system. Background technique [0002] In the CDMA cellular mobile communication system, all base stations use the same frequency band to transmit signals. For the forward link, the mobile station uses PN codes to distinguish different sectors. [0003] The number of PNs is limited, and in an actual network, the number of sectors will be far greater than the number of PNs, so PN multiplexing will occur. If, when assigning PN codes to sectors, the same PN code is assigned to two sectors that are closer to each other for various reasons, then the mobile station may make a wrong judgment (the mobile station relies on the PN code to distinguish between different sectors). Sector), resulting in handover failure or call drop. In order to avoid this situation, it is necessary to try ...

AI Technical Summary

Problems solved by technology

[0005] The first method is to calculate the distance between two cells using the same PN code one by one according to the longitude and latitude of the cells in the base station database, and then find out some sectors where PN multiplexing may cause problems based on human experience and maps. It is simple and easy to implement, but it lacks accuracy, especially it is not easy to find some situations that seem to be far away but cause co-PN interference due to over-area coverage, and the operation experience of the user is highly required during the implementation of this method ;

[0006] The second method is to calculate the distance between two cells using the same PN code one by one according to the latitude and longitude of the cell in the base station database, and then use simulation technology to simulate the coverage of the cell, so as to find some areas where PN multiplexing may have problems. This method is improved on the basis of the first method above. In theory, the second method can find problems more accurately, but because the current simulation technology cannot accurately simulate the coverage of the cell The precision required by the situation, so it still lacks accuracy, and the implementation is more complicated;

This method is more reasonable than the first method, but it is also lacking in accuracy, especially for some cases where adjacent cells are missing.

[0008] The above three methods are based on the configuration information of some cells to judge the problem, and there is a defect that the judgment result does not match the actual situation. In addition, the above three methods are based on the prevention of the problem, and do not use Some of the more convincing statistics have accumulated since the network went live

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