Doc.: IEEE 802.11-01/067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 1 802.11a/(e) and HiperLAN/2 Interworking via CCEPC.

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Presentation transcript:

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide a/(e) and HiperLAN/2 Interworking via CCEPC Stefan Mangold 1, Sunghyun Choi 2, Thorsten Wiemann 1 ComNets Aachen University 1, Philips Research 2

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 2 Interworking Scenario Infrastructure based CC: Central Controller HiperLAN/2 HE (E)PC: Enhanced Point Coordinator H2 and (e) time sharing is coordinated by beacons and TxOPs Level-3 Interworking detection range Application Specific Adaptation-/ Convergence-Layer Isochronous Appl./Traffic (eg, ).11(e/h) MAC H2-RLC.11-SME H2 /.11a/(h) PHY H2 DLC+HE vector indicates "has control over"

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 3 TGe will support QoS As part of the upcoming e 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.

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 4 Legacy: CCEPC coordinates HiperLAN/2 HiperLAN/2 MAC frames within CFP, not CP Time sharing: CFP: HiperLAN/2 – CP: Superframe with CFP and CP, based on time units (1024us) – H/2 will not start right after beacon Beacon delays due to legacy devices

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 5 TGe: CCEPC coordinates the two modes CCEPC can initiate HiperLAN/2 at any time during CFP TxOPs allow periods for HiperLAN/2 and CF-traffic within CFP Length of CP is defined by CCEPC

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 6 CCEPC characteristics For interworking and sharing: H2  time division, absence mode  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

doc.: IEEE /067r1a Submission March 2001 S. Choi and S. Mangold, Philips Research/ComNetsSlide 7 Summary Periodic and exclusively allocated H2 MAC frames are integrated into the superframe. QoS is main concern. For isochronous traffic we rely on TxOPs defined at TGe. Changes required in H2 and e are minimal. Focus lies on the infrastructure-based version of