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BAN MAC: Technical Requirements and Impact on PHY & MAC

This document explores the technical requirements and their impact on the PHY and MAC considerations for the BAN MAC standard. It discusses the need to leverage the characteristics of the application areas and the challenges of higher data rate applications. A hybrid approach combining TDMA and contention-based access is proposed. Application scenarios for vital signs monitoring and streaming of vital signs data are presented.

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BAN MAC: Technical Requirements and Impact on PHY & MAC

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [A Perspective of the BAN MAC] Date Submitted: [11 January, 2008] Source: [Dr. Okundu Omeni] Company [Toumaz Technology Ltd] Address [115 Milton Park, Abingdon, UK] Voice:[+44 1235-438-950], FAX: [+44 1235-438-970], E-Mail:[okundu.omeni@toumaz.com] Re: [n/a] Abstract: [How do the stated technical requirements constrain the PHY & MAC?] Purpose: [Explores the various technical requirements and their impact on the PHY and MAC considerations for this standard] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Slide 1

  2. A Perspective of the BAN MAC Dr. Okundu C. Omeni Toumaz Technology Ltd. Slide 2

  3. Motivation Slide 3

  4. Key Application Areas Proposed • Medical – vital signs monitoring • Sports – heart rate, speed • Entertainment – gaming, video/audio • Other fancy stuff… Slide 4

  5. We need to leverage on the characteristics of this application area to develop the most efficient solution • This presentation is biased towards medical applications • However some valid questions are raised Slide 5

  6. The terminal nodes are power constrained and should be as simple as possible. • Making them pseudo coordinators or relays would not be the best solution • If the coordinator fails in a critical application, then the terminal nodes can roam to the nearest active coordinator which could easily be added as backup to the coordinator (that always listens). For this type of application the added expense is justified. Slide 6

  7. High Level Requirement • This states that data rates up to 10Mbps and down to 10kbps should be supported. (see section 2.1 of document [0037-01]) • This requirement needs to also be in line with the applications and MAC topology • Generally the highest data rate would determine the power consumption, so we cannot get the low power benefits of low data rate if we also need to support the highest data rates. Slide 7

  8. Higher Data Rate complicates PHY choices • A 10Mbps data rate requirement would mean that a bandwidth of around 10MHz/channel is required • If we use a lower bandwidth, then more complex (power hungry) modulation/demodulation schemes would be required. Slide 8

  9. Higher Data Rate Applications also complicate MAC choices • Audio/video streaming applications do not fit into TDMA • How can these co-exist on the same network with medical application? • Why should they? • If they shouldn’t, then why should they all be supported by this standard? Slide 9

  10. Higher Data Rate Applications also complicate MAC choices – contd… • These are really 2 different standards (like 802.15.3c & 802.15.4e) • Trying to forge them into 1 would significantly complicate both the PHY and MAC and we really don’t have a chance of meeting the key objective of this standard; which is a low complexity, ultra-low power and high reliability communication standard Slide 10

  11. A Hybrid Approach • Combine both TDMA and contention based access • Gives the benefits of periodic and non-periodic traffic • Network planning required • Sensor nodes sleep when not communicating • Coordinator communicates with the sensor nodes during their assigned time slots and listens otherwise • Sensor nodes with critical data can transmit outside their time slots Slide 11

  12. RF Channel Y TS TS TS TS TS TS TS TS TS TS Cluster X Cluster Y TS TS ROAMING RF Channel X BS to BS Communications BS BS ROAMING Network Topology Slide 12

  13. MAC Architecture • TDMA Slide 13

  14. Application Scenario 1 • Very low frequency vital signs monitoring e.g. blood glucose, temperature heart rate. • Terminal node sleep times in the order of minutes • Small data payload • Very low duty cycle • Coordinator should be able to support up 256 or more sensor nodes Slide 14

  15. Application scenario 2 • Streaming of vital signs monitoring data e.g. ECG, EEG, motion detection • Duty cycle dependent on bit rate • Number of sensor nodes also dependent on bit rate Slide 15

  16. Single Lead ECG Streaming Slide 16

  17. Wearable Batteries: Wireless Standards Increasing Power, Cost, Size 802.15.6 standard WiFi/802.11 UWB/802.15.3 Wibree(ULP BT)/Bluetooth/802.15.1 Zigbee/802.15.4 Existing Proprietary All current standards compromise power consumption for generality, data rate/range. Slide 17 connected freedom

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