Method and device for avoiding passive intermodulation interference in a dual-mode system

Abstract

The invention discloses a method and system for avoiding passive intermodulation interference in a dual-mode system. It includes: when the passive intermodulation in the uplink multi-frequency system causes the uplink carrier reception interference to reach the first set threshold, the base station switches the uplink frequency band of the UE whose transmit power is greater than the second set threshold to another frequency band; and , the base station configures the uplink carrier that does not support the uplink multi-frequency terminal at a frequency point away from the transmitting frequency band. The method and system for avoiding passive intermodulation interference in a dual-mode system of the present invention, for a system supporting multiple frequency bands, through resource scheduling, will not cause cell coverage contraction and network performance damage due to excessive intermodulation interference. At the same time, for a system that does not support multiple frequency bands, through frequency band allocation, its uplink is allocated to a frequency band less subject to intermodulation interference, thereby ensuring the coverage and network performance of the system.

Description

Technical field [0001] The present invention relates to the field of communication technology, and more particularly to a method and apparatus that avoids passive intermodulation interference in a dual mode system. Background technique [0002] In the FDD (Frequency Division Duplexing, Frequency Duplex) system, when the base station is transmitted during high power transmission, passive intermodulation is generated due to the duplexer and antenna, and if these passive intermodulation interference is large and the reception The frequency band will result in an increase in the interference of base station, and the sensitivity is deteriorated, which affects the coverage and network performance of the network. [0003] Current PDT (Available Digital Cluster) Communication System In order to avoid emission passive intermodulation, the transmission antenna and the receiving antenna separation method are employed. Also combined with the frequency point plan, the base station itself has ...

AI Technical Summary

Problems solved by technology

[0008] Method 1: Improve the intermodulation index requirements of duplexers and antennas, and increase the fifth-order intermodulation index to -180dBc@43dBm, but this index is difficult to achieve for passive devices, or the implementation cost is extremely high

[0009] Method 2: Adopt the design of the traditional PDT base station to separate the transmitting antenna from the receiving antenna, but this will increase the cost of equipment, increase the difficulty and cost of engineering construction

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