802.15.3 Taekyoung Kwon.

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Presentation transcript:

802.15.3 Taekyoung Kwon

CAP should exist in 2.4GHz PHY

802.15.3 channels in 2.4GHz

802.11b channels (1/2)

802.11b channels (2/2)

Channel time allocation (CTA) Private CTA (dependent piconet) Dynamic (regular) CTA Per superframe Subrate : one CTA per multiple superframes Pseudo-static CTA Can use CTA without listening up to mMaxLostBeacons (4)

Transmission power control Beacon, CAP: set maximum power CTA: increase/decrease power

MAC frame format

Addressing (DEVID) 0x00: PNC 0xF7 .. 0xFC: neighbor piconets (NbrID) 0xFD: multicast frames (McstID) 0xFE: unassociated DEVs (UnassocID) 0xFF: broadcast frames (BcstID)

Frame control Fragmentation control

Beacon frame (header omitted) IEEE address us resolution 1ms -65,535 us MCTA allocation rate

Piconet mode

Information elements

Information elements

CTA Start time (in us) duration (in us)

Association request command ms order PNC capabilities PNC rating

Dev capabilities Dev utility Association reply command

2048 64

Power management (PM) PS set Wake beacon interval 0x00: APS 0x01: PSPS 0x02 – 0xFD: DSPS sets Wake beacon interval PSPS: 2 – 256 DSPS: 2 - 65536

MAC functionalities Start/maintain piconet (beacon) Join/leave (association/disassociation) Channel access Channel-time request/allocation Fragmentation/defragmentation ACK/retransmission Dynamic channel selection Transmission power control Power saving/management

Start/maintain piconet Parent piconet Child piconet Neighbor piconet PNC is not a member of the parent piconet Channel scan Passive scan (look for PNC’s beacon) Open scan (any beacon frame) Collect statistics and rate channels Remote scan PNC broadcasts beacon periodically

Parent vs child piconet

Start/maintain piconet caveat Child piconet member cannot directly send frame to parent piconet member Neighbor piconet no free channels No secure relationship Still association is required