Packet transmission time in 802.11: Difference between revisions
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| Data transmission bitrate (802.11g): |
| Data transmission bitrate (802.11g / a*): |
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.*) valid for 802.11a with the following change: No signal extension time, SIFS is 16μs instead of 10μs and DIFS should be 34μs instead of 28μs. The overall transmission time stays the same. |
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Revision as of 18:16, 6 March 2007
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)
| 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): | yes | ||||||||||||||||
| 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 | 6 | 134 | 24 | 12 | 134 | 12 | 12 | 134 | 12 | ||||
| signal extension time | 6 | 6 | 6 | 6 | |||||||||||||
| tx time ack: | 60 | 60 | 48 | 48 | |||||||||||||
| tx time data + ack: | 2158 | 1478 | 1126 | 786 | |||||||||||||
| Data transmission bitrate (802.11g / a*): | 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 | 24 | 134 | 8 | 24 | 134 | 8 | 24 | 134 | 8 | ||||
| signal extension time | 6 | 6 | 6 | 6 | |||||||||||||
| tx time ack: | 44 | 44 | 44 | 44 | |||||||||||||
| tx time data + ack: | 610 | 442 | 354 | 326 |
.*) valid for 802.11a with the following change: No signal extension time, SIFS is 16μs instead of 10μs and DIFS should be 34μs instead of 28μs. The overall transmission time stays the same.