Title :
Asymptotic results for voice delay in packet networks
Author :
Pazhyannur, Rajesh S. ; Fleming, Philip J.
Author_Institution :
Network Solutions Sector, Motorola, Arlington Heights, IL, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
This paper investigates the performance of packet networks carrying many low bit-rate real-time sources of traffic. We are primarily motivated by applications to the design of wide-area transmission links carrying coded voice traffic between the base sites and the core network of a cellular system. The large number of such links and distances they span lead to significant recurring costs for cellular operators forcing them to operate these links at very high utilization. The system model is composed of a highly utilized transmission link fed by a large number of voice sources. The voice sources are characterized by their correlation structure and relative time-offset with respect to each other. We present simulation and analytical results for this system emphasizing the impact of system utilization, correlation structure, etc. The analysis is based on two different approaches (1) Gaussian queue analysis and (2) heavy traffic analysis. The analysis reflects the statistical properties of the voice sources, in particular, their correlation structure. A key analytical result is that the delays in the system can be characterized by two scaled exponential distributions: one for small delays and the other for large delays
Keywords :
Gaussian processes; cellular radio; correlation methods; delays; exponential distribution; packet radio networks; queueing theory; radio links; speech coding; voice communication; Gaussian queue analysis; asymptotic results; cellular operators; coded voice traffic; correlation coefficients; correlation structure; heavy traffic analysis; low bit-rate traffic; packet networks; packet queuing delay distribution; real-time traffic; relative time-offset; scaled exponential distributions; simulation results; statistical properties; system model; system utilization; voice delay; voice sources; wide-area transmission links; Analytical models; Circuits; Codecs; Costs; Delay; Intelligent networks; Queueing analysis; Speech analysis; Telecommunication traffic; Traffic control;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956523
