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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