Packet transmission time in 802.11

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Revision as of 18:01, 6 March 2007 by Ofriedri (talk | contribs) (added tables for 802.11g and fixed some small errors)
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Frame exchange duration for a unicast data frame and the acknowledgement frame

For 802.11b bitrates (valid in 802.11b and g; short headers used)

o Payload in bytes: 1500
Short preamble and headers (DSSS): yes
Data transmission bitrate (802.11b/g): 1
Mbps
2
Mbps
5,5 Mbps 11 Mbps
Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs)
DIFS 50 50 50 50
D PHY header: PLCP preamble 1 144 144 1 72 72 1 72 72 1 72 72
A PHY header: PLCP header 1 48 48 2 48 24 2 48 24 2 48 24
T MAC headers (28 bytes) + MAC body 1 12224 12224 2 12224 6112 5,5 12224 2223 11 12224 1111
A tx time data: 12466 6258 2369 1257
SIFS 10 10 10 10
A PHY header: PLCP preamble 1 144 144 1 72 72 1 72 72 1 72 72
C PHY header: PLCP header 1 48 48 2 48 24 2 48 24 2 48 24
K MAC headers (28 bytes), no MAC body 1 112 112 2 112 56 5,5 112 21 11 112 11
tx time ack: 314 162 127 117
tx time data + ack: 12780 6420 2496 1374
Basic rate set minimal (6, 12, 24 Mbps): no
Data transmission bitrate (802.11g / a*): 6
Mbps
9
Mbps
12 Mbps 18 Mbps
Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs)
DIFS 28 28 28 28
D PHY header: PLCP preamble - - 16 - - 16 - - 16 - - 16
A PHY header: PLCP header 6 24 4 6 24 4 6 24 4 6 24 4
T MAC headers + MAC body + PHY pad 6 12246 2044 9 12246 1364 12 12246 1024 18 12246 684
A signal extension time 6 6 6 6
tx time data: 2098 1418 1078 738
SIFS 10 10 10 10
A PHY header: PLCP preamble - - 16 - - 16 - - 16 - - 16
C PHY header: PLCP header 6 24 4 6 24 4 6 24 4 6 24 4
K MAC headers 6 134 24 9 134 16 12 134 12 18 134 8
signal extension time 6 6 6 6
tx time ack: 60 52 48 44
tx time data + ack: 2158 1470 1126 782
Data transmission bitrate (802.11g): 24 Mbps 36 Mbps 48 Mbps 54 Mbps
Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs) Bitrate (Mbit/s) Length (bits) Time (μs)
DIFS 28 28 28 28
D PHY header: PLCP preamble - - 16 - - 16 - - 16 - - 16
A PHY header: PLCP header 6 24 4 6 24 4 6 24 4 6 24 4
T MAC headers (28 bytes) + MAC body 24 12246 512 36 12246 344 48 12246 256 54 12246 228
A signal extension time 6 6 6 6
tx time data: 566 398 310 282
SIFS 10 10 10 10
A PHY header: PLCP preamble - - 16 - - 16 - - 16 - - 16
C PHY header: PLCP header 6 24 4 6 24 4 6 24 4 6 24 4
K MAC headers + PHY pad 24 134 8 36 134 4 48 134 4 54 134 4
signal extension time 6 6 6 6
tx time ack: 44 40 40 40
tx time data + ack: 610 438 350 322