Các nút nguồn không ngay lập tức gửi thông tin cấu trúc liên kết của nó với bất kỳ người hàng xóm. Kích hoạt liên kết kích hoạt liên kết được phát hiện bởi một nút nhóm đó không phải là một đứa trẻ mồ côi được coi là một | MULTITIER WIRELESS CELLULAR NETWORKS 683 parameters. TSC TSCmax m max 1 TSC max X11 6 3 d T. fl2 3V2I2 2 bi 3 2V3 Vi 9 zi U 0 WRW9K c ylỹsà ặ while fflmini mi rnmaxi do m 1P x 11 1 Rị 1 hl bi Ri while 1 Cl C do M LC1 1J v L C-C11 2J 11 1 11 ẠÍ1 1 9 11 M L m y 0 ii i n Wi i 9 ii r7j for l k do m2 1 3k k 1 TSC Ximi ỵ2mi m2 - 1 if TSC TSC then break Rn Rd C 12 a2R22 h2 bdR. 2 n _ 12 l i2 r2 l 9 i2 N2 p d0 Eỷìo 2 1 12 72 1 9h2 J n Pl 1 p 2Pl . 2 -1 pl if PLT PLTn and PL 1 Pfax l and PL 2 Pfax l then break end for 684 NETWORK DEPLOYMENT if TSC TSC then k k m i m . m2 ffl2 à Ã1 c 1 V 2 Cl Cl c2 c - Cl end if end while end while The outputs are TSC mỊ mị R 1 R2 ƠỊ and CL Performance example To generate numerical results a system with the parameters shown in Table is used 21 The performance of the two-tier system is compared with that of a one-tier system. To obtain results for a one-tier system the opiimiz-on algorithm with T 1 R2 was run. This results in both tiers sharing the same cells and m2 1. The total cost is then computed as TSC fflifi. Table Example system parameters Parameter Value range Units rf 100 km2 c 90 Channels s 2 2 Calls min km2 2 5Ấ pfc m Calls mm em2 Mi 32 Calls min Xi in 1000 s base X2 in 1000 s base T 30500 23 u2 km h 3 TSC JU-max 10 000-20000 in 1000 s PLTmax i LOCAL MULTIPOINT DISTRIBUTION SERVICE 685 Average tier 2 mobile speed km h Figure Comparison of the total system costs between the one-tier and two-tier systems ấỊ l calls min km2 and Ấ 20 calls min km2 . Figure depicts the total system cost as a function of tier 2 mobile speed while tier 1 mobile speed is fixed for one-tier and a two-tier systems. The tier 1 mobile speeds considered are 30 90 180 270 360 and 540 km h. The main conclusionXeom Figure and many other similar runs 21 is that for the parameter ranges used in this study the two-tier system outperforms the single-tier system e LOCAL MULTIPOINT
