(Off-net disturbances from other communication systems. The size of the disturbance is a key factor affecting the network operation, and has a significant impact on call quality, dropped calls, handovers, and congestion. How to reduce or eliminate annoyance is the primary task of network planning and optimization. On the basis of summarizing the experience of domestic and foreign experts, this article systematically describes the origin of the annoyance, the location of the annoyance and its solutions.)
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