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Ultra Wide Bandwidth (UWB) MAC and Networking

Ultra Wide Bandwidth (UWB) MAC and Networking. Future Networking Research Topic Ke Liu Dec. 18, 2006. Outlines. The Background The Architecture Introduction to the UWB MAC protocol Brief introduction to UWB WiNet. Why UWB?. Wireless Connectivity for Digital Home. WiMedia Participants.

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Ultra Wide Bandwidth (UWB) MAC and Networking

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  1. Ultra Wide Bandwidth (UWB) MAC and Networking Future Networking Research Topic Ke Liu Dec. 18, 2006

  2. Outlines • The Background • The Architecture • Introduction to the UWB MAC protocol • Brief introduction to UWB WiNet

  3. Why UWB? • Wireless Connectivity for Digital Home

  4. WiMedia Participants 180+ companies (PC, CE, Cellular Players) Convergence layer for multiple protocols WiMedia Endorses MBOA PHY May 04 UWB PHY and MAC standardization

  5. WiMedia UWB MAC protocol • TDMA based • Contention based (IEEE 802.11) • QoS Supported (IEEE 802.11e based) • Although IEEE 802.15.3 was being standardized, it ceased this.

  6. Basic Communication Model • Superframe: the basic timing structure for fame exchange • One Superframe is composed of 256 media access slots (MASs) • Each Superframe starts with a Beacon Period (BP), decided by the number of devices involved • The start of BP (or Superframe) is called BPST (BP start time), all devices need to synchronize BPST with each other

  7. Superframe Structure • In BP, each MAS consists of 3 Beacon Slots • 1 Superframe = 65,536 µs = 256 MASs • 1 MAS = 256 µs = 3 Beacon Slots • 1 Beacon slots = 85 µs

  8. Communication Negotiation • The maximum size of BP consists of 96 Beacon slots • Up to 94 Devices are allowed in “Some” Range • Each involved device occupies one Beacon slot to negotiate with other devices • Except the first 2 beacon slots can be occupied by some device

  9. Communication Negotiation (cont’) • A device starts up with scanning all channels (128 candidates) • On receiving a beacon in some channel, the device would select it; • After scanning several (typically 3) superframes, it would synchronize its BPST to the hearing ones. • If no beacon received on any channel, it would start a BP with a BPST decided by itself

  10. Communication Negotiation (cont’) • If a beacon slot is unoccupied, the device would occupy it to send its own beacon; • If no beacon slot is available, it would send its beacon in one of the first 2 beacon slots (signal slots), and the one after the last occupied beacon slot • Other devices hear this signal slot beacon, would extend their BP length by a pre-set value (typically 3-6).

  11. Communication Negotiation (cont’) • For a given device, an unoccupied beacon slot means • Beacon received through the beacon slot; • Or, beacon received by some neighbor • All the information of devices need to be exchange through Information Elements (IEs) along with beacon exchanging

  12. Important IEs Examples • BPOIE: Beacon Period Occupancy IE • BP Switch IE: synchronizing BPSTs of neighbors • Identification IE: addressing devices • DRP IE: distributed reservation protocol IE • DRP Availability IE: the DRP communication MAP • PCA IE: prioritized contention access IE

  13. Data Communication: DRP and PCA • Distributed Reservation Protocol (DRP): • Device reserves several MASs for sending data through DRP IE • If no conflict, other devices would reply through DRP availability IE with reserved MASs updated, • Device sends data at least one superframe later after it sends request • Prioritized Contention Access (PCA): • For any MASs un-reserved, any device can obtain the sending token through a mechanism as IEEE 802.11e

  14. Data Communication Acknowledges • 3 Acknowledge methods • No-Ack: no acknowledge required • Imm-Ack: acknowledge is required for each packet received • B-Ack: block acknowledge, one acknowledge is required for each block (block size varies) • The acknowledge requirement is set through packet header

  15. DRP Throughput: simulation demo

  16. DRP Throughput: simulation demo (cont’)

  17. Primary References Web Links • WiMedia Alliance: http://www.wimedia.org

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