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There are different wireless technologies that share the same 2.4 GHz frequency band. Such technologies usually operate in proximity and have to co-exist with each other. For example, WiFi uses the same frequency band that is used by ZigBee, however, WiFi uses higher power levels compared with ZigBee. When the ZigBee and WiFi use the channel at the same time, an interference problem appears which causes loss of the data packets being transmitted. This will result in retransmission in both WiFi and ZigBee until a successful transmission is achieved. This, in turn, causes delay and mitigation in the delivery ratio for both technologies.
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