Table 2 Default attribute values used in the simulation.
From: On Adaptive Contention Resolution Schemes for IEEE 802.16 BWA Systems
Parameter | Value |
|---|---|
MAC layer | |
Channel capacity | 32 Mbps(QPSK) |
Number of subchannels | 30 |
Symbol rate | 16 Megabaud |
Slot size | 1 byte |
Frame duration | 4 ms |
Physical slots per frame | 4000 |
Downlink/uplink ratio |
|
Ranging opps. Per frame | 12 OFDMA symbols |
Number of ranging retry | 16 |
Bandwidth request opp. per frame | 12 OFDMA symbols |
Number of bandwidth request retry | 6 |
Backoff start value | 4 |
Backoff end value | 10 |
Initial ranging CID | 0 |
Basic CIDs | 1–1000 |
Primary CIDs | 1001–2000 |
Threshold | 512 |
System time | |
OFDMA symbol time | 100.84  |
OFDMA frame length | 5 ms |
Ranging interval interval | 1210.08  |
Bandwidth request interval | 1210.08  |
TTG | 200  |
RTG | 200  |
T1-T26 | As defined in IEEE 802.16 standard |
Physical layer | |
Spectrum | 5.0 GHz |
Bandwidth | 5 MHz |
Simulation topology |
|
Offered traffic load | 0.12 Mbps |
QPSK 1/2 | 4.99 Mbps |
QPSK 3/4 | 7.48 Mbps |
16-QAM 1/2 | 9.97 Mbps |
16-QAM 3/4 | 14.96 Mbps |
64-QAM 2/3 | 19.95 Mbps |
64-QAM 3/4 | 22.44 Mbps |
QPSK 1/2 | −79 dBm |
QPSK 3/4 | −76 dBm |
16-QAM 1/2 | −72 dBm |
16-QAM 3/4 | −69 dBm |
64-QAM 2/3 | −65 dBm |
64-QAM 3/4 | −63 dBm |
