An Analysis of VoIP Service Using 1$times$EV-DO Revision A System

Scheduling and Capacity of VoIP Services in Wireless OFDMA Systems

“…The G.729 codec generates a 20 byte encoded voice frame every T v = 20 milliseconds (Bi et al, 2006). Hence, the average size of voice data per a medium access control (MAC) packet can be expressed as follows:…”

Performance of 1x EV-do revision a systems with best effort data and voice over IP

“…In addition to the VoIP operation related assumptions described in [6], several assumptions are made to facilitate the analysis of the mixed BE data and VoIP traffic:…”

“…BE data throughput generated when the scheduler generates a multi-user packet for the VoIP traffic, and the BE data user traffic is piggybacked within this MUP. Assuming that the BE data throughput realized under the two conditions specified is approximately independent, the total aggregate sector BE throughput S in the physical layer can be written as: (1) where r is the time slot utilization by the VoIP traffic calculated using equation (11) in [6], S b is the average physical layer throughput in the time slots carrying only the BE data traffic, S m is the average physical layer throughput in the time slots carrying multi-user packets, and S v is the average physical layer VoIP traffic throughput transmitted using multi-user packets.…”

“…In equation (5), {q m }, m is the probability mass function (PMF) of the number of VoIP users in the queue defined by equation (9) in [6]; {c i }, I ϭ 1, 2, 3 is the normalized probability of the effective type 1, type 2, and type 3 VoIP traffic presented to the forward link scheduler and calculated from equation (1) in [6]; {h i |m }, I [1,8], m [1, ∞) is the conditional probability that i VoIP user frames are served by the scheduler when there are m VoIP users in the queue, shown in Table II in [6]; {s k|i } is the conditional probability of transmission of the MUP with format index k containing i VoIP user frames. The probability {s k|i } is computed from:…”

“…An overview of physical and medium access control (MAC) layer improvements due to Revision A has been presented in [3]. Voice over IP performance in the 1x EV-DO system has been analyzed in [6,10].…”