Paper Info
Title
VoIP Erlang Capacity in Coordinated Cognitive Radio Networks.
Abstract
Guaranteeing QoS is challenging in cognitive radio networks due to the dynamically changing network resources, especially for stringent delay sensitive traffic. Dynamic spectrum leasing (and coordinated cognitive radio) of primary network resources has been previously proposed in the literature to improve QoS of secondary users. In this paper, the Erlang capacity in coordinated cognitive radio networks with VoIP traffic is investigated. Employing time-scale decomposition technique and conventional continuous and discrete time Markov chain tools, a joint connection-level and packet-level analytical model is developed. For the adequate and fair performance comparison, a call admission strategy with fractional admission threshold and fractional buffering is considered. An algorithm to determine the optimal values (i.e., the ones that maximize Erlang capacity) of the admission threshold and buffer size is proposed. For given QoS requirements at session and packet level (i.e., VoIP session blocking, packet dropping, and packet delay), the Erlang capacity as function of the maximum allowable number of simultaneously rented resources is evaluated. Additionally, the fraction of time that spectrum leasing is needed is calculated.
Year
DOI
Venue
2013
10.1109/VTCFall.2013.6692455
VTC Fall
Keywords
Field
DocType
markov processes,cognitive radio,internet telephony,quality of service,channel capacity
Call-second,Markov process,Computer science,Network packet,Erlang (programming language),Quality of service,Computer network,Channel capacity,Cognitive radio,Voice over IP
Conference
ISSN
Citations 
PageRank 
1090-3038
0
0.34
References 
Authors
14
4
Name
Order
Citations
PageRank
S. Lirio Castellanos-Lopez1358.72
Felipe A. Cruz-Pérez210021.96
Mario E. Rivero-Angeles38923.80
Genaro Hernández-Valdez46816.22