Presented by Seoungyoul Oh

Providing Telemedicine Service In An Infrastructurebased Cognitive Radio Network
 IEEE Wireless Communications, February 2010
 Shan Feng, Zhongliang Liang, and Dongmei Zhao
 McMaster Univ.

Telemedicine system
 Remote patient monitoring system
 Blood pressure, glucose, electrocardiography …

Existing solution – Body area network (BAN)
 IEEE 802.15.4-based
▪ Data rate & Comm range are limited
CBS

Upload infrastructure model
 Cognitive base station (CBS)
▪ Multiple radio
 H-station

H-station
H-station
H-station
Types of traffic
 Urgent traffic
 Monitoring traffic

Assumption
 Only CBS performs sensing
 Data (H-station) – Ack (CBS)
▪ If an ACK is not received, H-station considers the current channel
is occupied by the PU

Assumption
 N channels, K radios at the CBS
▪ At most N/K times sensing

Step1) CBS stops sensing if
 Found k available channel
 Or all N channels have been sensed

Step2) The radios switch to available channels

Step3) Mapping procedure

Periodic sensing

At CBS
 Beacon msg
 Time sync
 Inform the available channel to H-station
Superframe 1
Superframe 2
CH available
SB
Tr
MD
1
MD
2
CH available
MD
3
SB
UD
MD
3
MD
4
MD
5
Tr
Tu
S : Sensing
B : Beacon
MD
UD
: Monitoring data
: Urgent data
MD
6
Time
SB