CDMA Network Design. Robert Akl, D.Sc.
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1 CDMA Network Desgn Robert Akl, D.Sc.
2 Outlne CDMA overvew and nter-cell effects Network capacty Senstvty analyss Base staton locaton Plot-sgnal power Transmsson power of the mobles Numercal results
3 Problem Statement How to match cell desgn to user dstrbuton for a gven number of base statons? CDMA network capacty calculaton Reverse sgnal power and power control Plot-sgnal power Base staton locaton
4 CDMA Capacty Issues Depends on nter-cell nterference and ntra-cell nterference Complete frequency reuse Soft Handoff Power Control Sectorzaton Voce actvty detecton Graceful degradaton
5 Relatve Average Inter-Cell Interference I m s the path loss exponent. ζ s the decbel attenuaton E ω due to shadowng, and has zero mean and standard devaton χ 2 ζ m ζ r ( x,y) E m 2 r C ( x,y) /χ n Area( C ζ ) ω da( x,y) σ s.
6 Soft Handoff User s permtted to be n soft handoff to ts two nearest cells.
7 Soft Handoff (c) regon 2 (c) regon 2 (b) regon 2 (a) regon 2 ) ( E ) ( E ) ( E ) ( E x,y ωda r r χ r r I x,y ωda r r χ r r I x,y ωda r r χ r r I x,y ωda r r χ r r I k k k k k ζ m ζ m k ζ m m k k ζ m k ζ m ζ m m ζ m ζ m k ζ m m k k ζ m ζ m ζ m m
8 Inter-Cell Interference Factor κ n per user nter - cell nterference factor from cell to cell. users n cell producea relatve average nterference n cell equal to n κ.
9 Capacty Regon
10 Network Capacty Transmsson power of mobles Plot-sgnal power Base staton locaton
11 Power Compensaton Factor Fne tune the nomnal transmsson power of the mobles PCF defned for each cell PCF s a desgn tool to maxmze the capacty of the entre network
12 Power Compensaton Factor (PCF) Interference s lnear n PCF Fnd the senstvty of the network capacty w.r.t. the PCF
13 Senstvty w.r.t. plot-sgnal power Increasng the plot-sgnal power of one cell: Increases ntra-cell nterference and decreases nter-cell nterference n that cell Opposte effect takes place n adacent cells
14 Senstvty w.r.t. Locaton Movng a cell away from neghbor A and closer to neghbor B: Inter-cell nterference from neghbor A ncreases Inter-cell nterference from neghbor B decreases
15 Optmzaton usng PCF
16 Optmzaton usng Locaton
17 Optmzaton usng Plot-sgnal Power max T subect to M 1 n n, (network capacty) M 1 n β κ for 1,..., M. ( C β, L ) c ( ) eff 0,
18 Combned Optmzaton
19 Twenty-seven Cell CDMA Network Unform user dstrbuton profle. Network capacty equals 559 smultaneous users. Unform placement s optmal for unform user dstrbuton.
20 Three Hot Spot Clusters All three hot spots have a relatve user densty of 5 per grd pont. Network capacty decreases to 536. Capacty n cells 4, 15, and 19, decreases from 18 to 3, 17 to 1, and 17 to 9.
21 Optmzaton usng PCF Network capacty ncreases to 555. Capacty n cells 4, 15, and 19, ncreases from 3 to 12, 1 to 9, and 9 to 14. Smallest cellcapacty s 9.
22 Optmzaton usng Plot-sgnal Power Network capacty ncreases to 546. Capacty n cells 4, 15, and 19, ncreases from 3 to 11, 1 to 9, and 9 to 16. Smallest cellcapacty s 9.
23 Optmzaton usng Locaton Network capacty ncreases to 549. Capacty n cells 4, 15, and 19, ncreases from 3 to 14, 1 to 8, and 9 to 17. Smallest cellcapacty s 8.
24 Combned Optmzaton Network capacty ncreases to 565. Capacty n cells 4, 15, and 19, ncreases from 3 to 16, 1 to 13, and 9 to 16. Smallest cellcapacty s 13.
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27 Combned Optmzaton (m.c.)
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30 Combned Optmzaton (m.c.) Network capacty ncreases to 564. Capacty n cells 4, 15, and 19, ncreases from 3 to 17, 1 to 17, and 9 to 17. Smallest cellcapacty s 17.
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34 Conclusons Solved cell desgn problem: gven a user dstrbuton, found the optmal locaton and plot-sgnal power of the base statons and the reverse power of the mobles to maxmze network capacty. Unform network layout s optmal for unform user dstrbuton. Combned optmzaton ncreases network capacty sgnfcantly for non-unform user dstrbuton.
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