Voice over WiFi cell capacity enhancement using A-MPDU frame aggregation in WLAN standard

The rising popularity of Voice over WiFi (VoWiFi) needs a dedicated effort to find new solutions to expand VoWiFi cell capacity. The main aim of this research is to enhance the VoWiFi cell capacity using aggregate MAC protocol data unit (A-MPDU) frame aggregation. In this regard, we developed a mathematical formula to estimate the number of VoWiFi users that can be allowed without compromising the quality-of-service (QoS) of existing VoWiFi calls over the Wireless Fidelity (WiFi) standards by considering Arbitration inter-frame spacing (AIFS), Compressed RTP (cRTP) and A-MPDU frame aggregation. In this work, we utilized AIFS to assess the channel state prior to transmit VoWiFi data from the sender user equipment (UE) to the receiver UE and Short Inter-frame Spacing (SIFS) to transmit Request To Send (RTS) / Clear To Send (CTS) and Acknowledgement (ACK) frames. Using our proposed model, we have examined VoWiFi cell capacity considering A-MPDU frame aggregation in constant bit rate (CBR) traffic using AIFS and DCF Inter-frame Spacing (DIFS) in IEEE 802.11b/g/n/ac/ax/be Wireless Local Area Network (WLAN) standards. Additionally, we have found the maximum number of MAC protocol data unit (MPDU)s aggregated in a single A-MPDU for IEEE 802.11b/g/n/ac/ax/be. Further, we have analyzed the effect of voice packet retransmission on the cell capacity of a WLAN standard that provides VoWiFi service considering A-MPDU technique.