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802.11a/(e) and HiperLAN/2 Interworking via CCEPC

802.11a/(e) and HiperLAN/2 Interworking via CCEPC. Stefan Mangold 1 , Sunghyun Choi 2 , Thorsten Wiemann 1 ComNets Aachen University 1 , Philips Research 2. 802.11(E)STA. H2 MT. CCEPC. Interworking Scenario. Infrastructure based CC: Central Controller HiperLAN/2 HE (E)PC: Enhanced

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802.11a/(e) and HiperLAN/2 Interworking via CCEPC

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  1. 802.11a/(e) and HiperLAN/2 Interworking via CCEPC Stefan Mangold1, Sunghyun Choi2, Thorsten Wiemann1 ComNets Aachen University1, Philips Research2 S. Choi and S. Mangold, Philips Research/ComNets

  2. 802.11(E)STA H2 MT CCEPC Interworking Scenario Infrastructure based CC: Central Controller HiperLAN/2 HE (E)PC: Enhanced Point Coordinator H2 and 802.11(e) time sharing is coordinated by beacons and TxOPs Level-3 Interworking Isochronous Appl./Traffic (eg, 1394.1) Application Specific Adaptation-/ Convergence-Layer detection range H2 .11(e/h) DLC+HE H2-RLC MAC .11-SME vector indicates "has control over" H2 / .11a/(h) PHY S. Choi and S. Mangold, Philips Research/ComNets

  3. TGe will support QoS As part of the upcoming 802.11e MAC, the beacon can be transmitted at the TBTT all the time. ESTAs will not transmit their frames during the CP if they cannot finish their transmission before the next TBTT. Coordinator allocates transmission opportunities (TxOPs) “Intervals of time when a particular enhanced station (ESTA) has the right to initiate transmissions onto the wireless medium (WM), defined by a starting time and a maximum duration.“ Within the limits of each TXOP, decisions regarding what to transmit are made locally by the MAC entity at the ESTA. S. Choi and S. Mangold, Philips Research/ComNets

  4. Legacy: CCEPC coordinates HiperLAN/2 HiperLAN/2 MAC frames within CFP, not CP Time sharing: CFP: HiperLAN/2 – CP: 802.11 Superframe with CFP and CP, based on time units (1024us) H/2 will not start right after beacon Beacon delays due to legacy devices S. Choi and S. Mangold, Philips Research/ComNets

  5. TGe: CCEPC coordinates the two modes CCEPC can initiate HiperLAN/2 at any time during CFP TxOPs allow periods for HiperLAN/2 and 802.11 CF-traffic within CFP Length of CP is defined by CCEPC S. Choi and S. Mangold, Philips Research/ComNets

  6. CCEPC characteristics For interworking and sharing: • H2  time division, absence mode • 802.11  beacon, CFP For isochronous traffic, QoS: • TGe transmission opportunities, fixed periods for HiperLAN/2 MAC frames • TGh  DFS reduces interference from BSS and alien (legacy) devices S. Choi and S. Mangold, Philips Research/ComNets

  7. Summary • Periodic and exclusively allocated H2 MAC frames are integrated into the 802.11 superframe. • QoS is main concern. • For isochronous traffic we rely on TxOPs defined at TGe. • Changes required in H2 and 802.11e are minimal. • Focus lies on the infrastructure-based version of 802.11. S. Choi and S. Mangold, Philips Research/ComNets

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