caa a22 4500 477089119 CHVBK 20180405111511.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF02107048 doi (NATIONALLICENCE)springer-10.1007/BF02107048 Performance modeling of multitier PCS system [Elektronische Daten] [Yi-Bing Lin, Li Fung Chang, Anthony Noerpel, Kun Il Park] The emergence of multitier wireless access is being driven by the different compromises in technology required to provide wireless service in different environments. Three major tiers of wireless access are likely to emerge to providepersonal communications services (PCS): high-tier, low-tier, and unlicensed. Because of the service costs of the three tiers, the unlicensed system is given the highest priority to deliver the calls, and the high-tier system has the lowest priority to deliver the calls. To maintain this delivery priority, two multitier mobility management strategies have been proposed: the single registration strategy (SR) and the modified multiregistration strategy (MR). This paper proposes a new strategy called the lazy deregistration strategy (LDR) and compares the performance of the three strategies. We show that in most cases, LDR outperforms both SR and MR. The registration cost of SR is always no less than the cost of MR. The advantage of MR over SR is more significant if (i) when the user moves into the low-tier system, it is more likely that the currently visited low-tier VLR (visitor location register) is the same as the previously visited VLR, and (ii) the mobile station (MS) is more likely to move between the low-tier system and the high-tier system. The call delivery cost of MR is always no less than the cost of SR. The advantage of SR over MR is more significant if (i) the call arrival rate is large, (ii) the cost of delivering a call to the low-tier system is large, and (iii) the MS is likely to stay in the high-tier system. Plenum Publishing Corporation, 1996 High-tier nationallicence HLR nationallicence low-tier nationallicence multitier nationallicence PCS nationallicence roaming management nationallicence VLR nationallicence α l (α u ) : the probability that when the MS enters an unlicensed (low-tier) RA, the RA is different from the last visited RA nationallicence β u (β l , β h ) : the cost of delivering a call in the unlicensed (low-tier, high-tier) system nationallicence c u ( c l , c h ) : the number of times that the MS enters (leaves) the unlicensed (low-tier, high-tier) system nationallicence γ u (γ l , γ h ) : The cost of originating a call in the unlicensed (low-tier, high-tier) system nationallicence λ (λ′) : the call arrival (origination) rate to (from) a MS nationallicence N R, SR (N R, MR nationallicence N R, LDR ) : the number of registration operations of SR (MR nationallicence LDR) duringT nationallicence N CD, SR (N CD, MR nationallicence N CD , LDR) : the cost of call delivery of SR (MR nationallicence LDR) duringT nationallicence N CO : the cost of call origination of MR, SR, and LDR duringT nationallicence N SR (N MR nationallicence N LDR ) : the net cost of registration and call delivery for SR (MR nationallicence LDR) nationallicence P 1 (P 2, P 3) : the transition probability from the unlicensed (low-tier, high-tier) to the low-tier (unlicensed, low-tier) system nationallicence P u ( P l , P h ) : the probability that a MS visits the unlicensed (low-tier, high-tier) system (in terms of the number of visits) nationallicence T : an observation period nationallicence T u ( T l , T h ) : the total amount of time that a MS stays in the unlicensed (low-tier, high-tier) system duringT nationallicence Lin Yi-Bing Department of Computer Science and Information Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC aut Fung Chang Li Bellcore, Red Bank, New Jersey aut Noerpel Anthony Hughes Network Systems, Germantown, Maryland aut Il Park Kun Bellcore, Red Bank, New Jersey aut International Journal of Wireless Information Networks Kluwer Academic Publishers-Plenum Publishers 3/2(1996-04-01), 67-78 1068-9605 3:2<67 1996 3 10776 https://doi.org/10.1007/BF02107048 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02107048 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lin Yi-Bing Department of Computer Science and Information Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC aut NATIONALLICENCE 700 1- Fung Chang Li Bellcore, Red Bank, New Jersey aut NATIONALLICENCE 700 1- Noerpel Anthony Hughes Network Systems, Germantown, Maryland aut NATIONALLICENCE 700 1- Il Park Kun Bellcore, Red Bank, New Jersey aut NATIONALLICENCE 773 0- International Journal of Wireless Information Networks Kluwer Academic Publishers-Plenum Publishers 3/2(1996-04-01), 67-78 1068-9605 3:2<67 1996 3 10776 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer