Research Article
Delay Analysis of GTS Bridging between IEEE 802.15.4 and IEEE 802.11 Networks for Healthcare Applications
Table 1
Comparison of MAC parameters between beacon-enabled IEEE 802.15.4 and
IEEE 802.11b.
| CSMA-CA parameter | IEEE 802.15.4 | IEEE 802.11b |
| Backoff period size | 320s | 20s | Listen to the medium during backoff count | no | yes | Freeze the backoff ctr. when medium is busy | no | yes | Listen to the medium immediately before the
trans. | yes | no | Action when medium is sensed busy | New backoff phase | Freeze the backoff ctr. | Typical size of minimum backoff window | 8 | 32 | Typical number of backoff phases | 5 | 5 | Raw data rate | 250 Kbps | 1, 2, 5.5 or 11 Mbps | Typical physical + MAC layer header size | 48 + 72 bits | 192 + 272 bits | RTS and CTS | No in beacon enabled version | Yes |
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