Capacity Analysis of a WLAN Cell Using VoWiFi Service for CBR Traffic

The demand of IEEE 802.11 based Wireless Local Area Network (WLAN) is increasing in enterprises, homes, and public access areas primarily due to its high data rates, low cost, and ease of installation. While WLAN continues to be predominantly data-centric, the necessity of Voice over Internet Protocol (VoIP) over Wireless Fidelity (WiFi) or VoWiFi cell capacity analysis in infrastructure-based WLAN plays a vital role. We employed arbitration inter-frame space (AIFS) for assessing channel state before sending real-time data from one user equipment to another, and short inter-frame space (SIFS) for transmitting Request To Send (RTS), Clear To Send (CTS) and Acknowledgement (ACK) frames to study the VoWiFi cell capacity. We have proposed analytical approaches to estimate the cell capacity of an IEEE 802.11be WLAN standard Assess Point (AP) providing VoWiFi service considering well known vocoders such as G.723.1 and G.729. To minimize the call bandwidth, we employed the compressed RTP (cRTP) protocol. Additionally, we examined the impact of retransmission on cell capacity of a WLAN standard providing VoWiFi service.