On call admission control in DS/CDMA cellular networks

• Published in: IEEE transactions on vehicular technology Vol. 50; no. 6; pp. 1328 - 1343
• Main Authors: Chi-Jui Ho, Copeland, J.A., Chin-Tau Lea, Stuber, G.L.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2001; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Admission control; Analytical models; Applied sciences; Call admission control; Cellular; Cellular communication; Code division multiple access; Equipments and installations; Exact sciences and technology; Interference; Land mobile radio cellular systems; Mathematical analysis; Mathematical model; Mathematical models; Mobile radiocommunication systems; Multiaccess communication; Networks; Optimal control; Propagation; Propagation losses; Radiocommunications; Searching; Stochastic processes; Studies; Systems, networks and services of telecommunications; Telecommunication traffic; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Wireless networks; Access control; Performance evaluation; Mobile radiocommunication; Probabilistic approach; Outage; Wireless telecommunication; Teletraffic; Linear programming; Cell network; Traffic load; Electromagnetic interference; Call blocking; Code division multiple access; Analytical method; Mathematical model; Direct sequence
• DOI: 10.1109/25.966566
• ISSN: 0018-9545

Analytical models are proposed for various direct sequence code-division multiple-access (DS/CDMA) call admission control schemes. Many mathematical call admission models for DS/CDMA cellular networks have been proposed. However, they have shortcomings. First, by ignoring the stochastic traffic load variation or call blocking effect, they failed to sufficiently characterize the second moment of other-cell interference. This leads to inaccurate analysis of a real network. Second, the optimal control parameters were often obtained through an exhaustive search which was very time consuming. Finally, the estimation of system capacity in previous models was obtained by using a simple one-slope path-loss propagation model. However, it is well known that a two-slope path loss propagation model is needed in a line-of-sight (LOS) microcell propagation environment. We propose an analytical model for call admission to overcome these drawbacks. In addition, we combine a modified linear programming technique with the built analytical model to find better call admission control schemes for a DS/CDMA cellular network.