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Wireless sensor networks (WSNs) need to employ a network association mechanism that can securely allocate a unique address to each node while minimizing energy consumption. However, conventional centralized and broadcasting based network association mechanisms may consume large energy, and distributed network association mechanisms may suffer from addressing failure when applied to large scale WSNs...
It is of great concern to employ an efficient network joining mechanism to construct a large scale wireless sensor network (WSN). For example, ZigBee can construct a cluster-tree based WSN with the use of a simple network joining, addressing and routing mechanism. However, when applied to a large scale WSN, it may not provide desirable node connectivity mainly due to the waste of network depth and...
In this paper, we consider interference mitigation in IEEE 802.15.4 beacon-enabled cluster-tree networks. The proposed scheme first detects the presence of interference by means of packet-error detection and/or channel sensing in a clusterwise manner. In the presence of interference, the coordinator (or cluster head) fast notifies the presence of interference to its end devices by repeatedly transmitting...
In this paper, we consider performance improvement of IEEE 802.15.4 systems in the presence of co-channel interference from other systems such as wireless local area networks (WLAN). The proposed scheme first detects the presence of interference by means of spectrum sensing or transmission performance testing. When the presence of interference signal is detected, the coordinator changes the carrier...
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