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A MAC Protocol for Implanted Devices Communication

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Presentation on theme: "A MAC Protocol for Implanted Devices Communication"— Presentation transcript:

1 A MAC Protocol for Implanted Devices Communication
6137-Algorithms in Network Theory 2013

2 Based on A MAC Protocol for Implanted Devices Communication in the MICS Band by M.N.Islam, J.Khan, and M.R. Yuce in 2013 IEEE International Conference on Body Sensor Networks (BSN) Available on Moodle

3 Unlicensed ISM bands ISM – Industrial, Scientific, Medical 868 MHz
2.45 GHz 433 MHz

4 Medical Implant Communication System (MICS)
MHz 3m range 10 channels Maximum channel bandwidth (BW) – 300KHz Chips: Zarlink Semiconductors (now MESI)

5 MICS protocol Similar to IEEE for Low Resources Wireless Personal Area Network (LR-WPAN) Restricted by rules of Federal Communications Commission (FCC) European Telecommunication Standards Institute (ESTI) Australian Communication Authority (ACA) Industry Canada

6 MICS general communication
External device send a message to the implant Implant responds With -16dBm if it has Listen Before Talk (LBT) and Adaptive Frequency Agility (AFA) With -36dBm otherwise

7 A complete MICS based communication system

8 Propagation assumptions

9 Traffic categorization
(iii)

10 Proposed MAC Protocol

11 Superframe structure Length ≈ 125ms
Contention Access Period (CPA) - 9 slots of 7.808ms Emergency Access Period (EPA) – 3 slots of 7.808ms Scheduled Polling Period – 4 slots of 9.76ms

12 Protocol functionality 1/6
Hub sends C-Poll msg to connect/disconnect nodes Destination field contains node address or 0 The node sends Connection Request msg in CAP period When the node receives Connection Confirmation msg, sends data

13 Protocol functionality 2/6
Hub sends D-Poll msg to communicate with a node Hub sends address=0 to communicate with all devices

14 Protocol functionality 3/6
Node initiates communication in an emergency If connected with the hub, transmits data If not connected, selects a random channel to transmit If channel busy, goes to the next

15 Protocol functionality 4/6

16 Protocol functionality 5/6
Hub polls the nodes according to traffic category Retransmission used

17 Protocol functionality 6/6

18 Packet size

19 Quiz How the external device can schedule the traffic (in time) ?


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