Adaptive virtual slot for enhancing QoS of voice communication in MIL-STD-188-220

Voice communication requires stricter QoS than other types of data communication. Thus, network operations, including the MAC layer protocol, should provide specific voice communication handling to meet voice application requirements. The current MIL-STD-188-220 does not guarantee the QoS of voice communication because of the round robin scheduling mechanism in network access control. Thus, we propose a hybrid MAC that provides adaptive virtual slots for voice messages on top of Deterministic Adaptable Priority Network Access Delay (DAP-NAD). In our proposed scheme, packet delay and jitter requirements of voice communication can be guaranteed, regardless of the number of stations in the network. Besides, the jitter tolerance time allows the other stations to adaptively transmit their data without disturbing voice communication and preserving data packet delay. The extensive simulation results show that the proposed scheme can guarantee quality of voice communication, regardless of network size.