Capacity of a wireless LAN with voice and data services

The capacity of a carrier sense multiple-access wireless LAN with voice and data services using the TCP/IP protocol is analyzed to obtain a lower bound for the capacity of the wireless networks with voice and data services. The voice traffic is given a higher priority over the data traffic to accommodate the delay requirement for an acceptable quality of service. This is implemented by assigning the TCP protocol for data and the UDP protocol for voice. The relationship between the data throughput and the number of the voice users supported in this environment is analyzed by using a nonpreemptive queuing model. While the analysis in this paper can be applied to any voice encoding system, the improved multiband excitation voice encoding technique is adopted to provide a low transmission rate with an acceptable quality.