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	320𝜇s	20𝜇s
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 phases𝑚	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