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P-Frozen Contention Strategy (PFCS) for Solving Collision Chain Problem in IEEE 802.15.4 WPANs

IEEE 802.15.4 wireless personal area network (WPAN) requires devices to "frequently sleep to conserve power. Without hidden-device protection mechanism, collisions caused by hidden devices may last to frames from other later devices which may only hear some devices involving in previous collisions. Such collision chain problem (CCP) significantly degrades network throughput. This paper proposes a novel collision resolving scheme with P-frozen contention strategy (PFCS) to solve the CCP in WPAN. The coordinator could refer to two partially recognizable fields, frame length and source address, of corrupted frame to allocate dedicated bandwidth for correspondent device and to freeze its contention. Simulation results show that the proposed scheme can not only improve transmission efficiency and access delay but also conserve energy