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Potential of the HCCA scheme defined in IEEE802.11e for QoS enabled Industrial Wireless Networks

The new draft amendment IEEE 802.11e [1] introduces an improved medium access mechanism, called HCF Controlled Channel Access (HCCA), for deterministic real-time traffic. In this paper the performance of the HCCA is evaluated in an industrial automation network with real-time requirements. Thus a simulation model of the HCCA has been implemented for the network simulator OPNET [2] and the simulation results were compared with the EDCA in terms of latency in various scenarios.