Link Adaptation Strategies for IEEE 802.15.4 WPANs: Protocol Design and Performance Evaluation

다국어 초록 (Multilingual Abstract)

This paper proposes two link adaptation strategies forIEEE 802.15.4 wireless personal area networks (WPANs), using amulti-rate signaling set. In the proposed link adaptation strategies,themost adequate modulation and coding scheme (MCS) satisfyingthe target bit error rate (BER) of the end device is selected based onthe signal-to-interference-plus-noise ratio (SINR) of either a beaconor an acknowledgement (ACK) frame. The beacon-based linkadaptation scheme has low complexity and overhead, given that itperforms link adaptation only once per superframe. In contrast,the ACK-based strategy performs link adaptation at every ACKframe, and therefore provides a faster and more effective link adaptation,but at the expense of a larger overhead. The specific protocoldesign for the proposed link adaptation strategies is developedby constructing the signal flow based on the service primitives betweenthe protocol stack layers. The network simulator OPNETis used to implement an accurate IEEE 802.15.4 WPAN protocolstack and the simulation environment required for performanceevaluation. The simulation results show that the received throughputof IEEE 802.15.4 WPANs can be improved by exploiting theproposed link adaptation strategies instead of auto-rate fallback,the conventional WPAN strategy.

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