caa a22 4500 475789784 CHVBK 20180406123708.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1023/A:1019112627233 doi (NATIONALLICENCE)springer-10.1023/A:1019112627233 Virtually fixed channel assignment in cellular mobile networks with recall and handoffs [Elektronische Daten] [Zuoying Xu, Pitu Mirchandani, Susan Xu] A promising approach for implementing channel assignment and control in cellular mobile telephone networks is the virtually fixed channel assignment (VFCA) scheme. In VFCA channels are allocated to cells according to the fixed channel assignment (FCA) scheme, but cells are allowed to borrow channels from one another. As such, VFCA maintains the efficiency of FCA, but adds the flexibility lacking in FCA. One feature of a VFCA network is that, to prevent co-channel interference, it requires several channels to be locked to serve a single call that borrows a channel. This feature raises the concern that VFCA may lead to chain reaction in channel borrowing among cells and cause the network performance to degrade, especially under heavy traffic conditions. In this paper, we propose the virtually fixed channel assignment with recall (VFCAWR) scheme: The network is implemented according to VFCA, but a cell can recall a locked channel to service an arriving handoff call, which occurs when a mobile unit crosses the boundary of its cell. We model the network as a three-dimensional Markov chain and derive its steady-state performance. Through modification of this basic model, we evaluate two dynamic channel assignment strategies, the virtual channel reservation (VCR) strategy and the linear switch-over (LSO) strategy, which exploit the unique borrowing/recall capability of VFCAWR to reduce the weighted cost of blocking fresh and handoff calls by reserving several virtual channels (the channels that may be borrowed from adjacent cells when necessary) for handoff calls. We validate the analytical models by simulation; the simulation test cases show that our models accurately predict the system performance measures of interest. Numerical and simulation results also show that both dynamic strategies outperform conventional channel reservation schemes based on fixed channel assignment and hybrid channel assignment. Kluwer Academic Publishers, 2000 Xu Zuoying Internet Engineering, Cable and Wireless USA, 11700 Plaza America Drive, 20191, Reston, VA, USA aut Mirchandani Pitu Systems and Industrial Engineering Department, University of Arizona, 85721, Tucson, AZ, USA aut Xu Susan Department of Management Science and Information Systems, Smeal College of Business Administration, The Pennsylvania State University, University Park, 16802, PA, USA aut Telecommunication Systems Kluwer Academic Publishers 13/2-4(2000-07-01), 413-439 1018-4864 13:2-4<413 2000 13 11235 https://doi.org/10.1023/A:1019112627233 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1019112627233 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xu Zuoying Internet Engineering, Cable and Wireless USA, 11700 Plaza America Drive, 20191, Reston, VA, USA aut NATIONALLICENCE 700 1- Mirchandani Pitu Systems and Industrial Engineering Department, University of Arizona, 85721, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Xu Susan Department of Management Science and Information Systems, Smeal College of Business Administration, The Pennsylvania State University, University Park, 16802, PA, USA aut NATIONALLICENCE 773 0- Telecommunication Systems Kluwer Academic Publishers 13/2-4(2000-07-01), 413-439 1018-4864 13:2-4<413 2000 13 11235 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer