ECA Overview (Enhanced Contention Access)

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Presentation transcript:

ECA Overview (Enhanced Contention Access) Jin-Meng Ho TI Khaled Turki TI Sid Schrum TI Wim Diepstraten Agere Systems Mathilde Benveniste AT&T Menzo Wentink Intersil Maarten Hoeben Intersil Greg Chesson Atheros Harold Teunissen Lucent Technologies

History DCF DQOS vDCF pDCF TCMA ECA Contention window […CW…] Multiple CWs [..CW0..] [… CW1 …] [… CW2 …] Internal collisions COffset [..CW0..] CO[.. CW1 ..] CO2..[… CW2 …] TCPP -> backoff time full updates, full adaptation UAT (non-decrementing offset) Unified controls

Robust Differentiation Goodput overlay with offered load

Adaptive Control

UAT-Enhanced MAC Priority TCMA V-DCF 30 90 5.0 Mbps 2.5 Mbps 150 Time (sec) 30 90 5.0 Mbps 2.5 Mbps 150 Priority UAT-Enhanced MAC TCMA TCMA A7 VDCF B7 V-DCF

EAP Control Parameters in Beacon or Management Frame flags NDO Offset[0-7] TCPP[0-7] Bscale Flags: Fast update flag: disable autonomous backoff Other bits reserved NDO Mask (non-decrementing offset) Enables UAT-like offset per TC, delta=1 after PIFS Autonomous backoff exponent: 1 bit per traffic class Flags, NDO mask, Offsets, TCPPs: 8-bits each Default parameters defined for IBSS use

Station Capabilities Station may implement any internal queue frame-dropping method.

Sending Frames Frame arrives in TC Get TxOP On collision/failure: Apply offset and/or NDO if indicated; then do either: Select random backoff from CW[TCPP]; countdown. Compare random number to PP[TC] threshold at every slot; transmit from TC as indicated by comparison. On collision/failure: If CW method, double window size (unless disabled) Perform local fast backoff adaptation If TCPP method, divide TCPPs by two (unless disabled)

Summary Controls Compatibility, Transparency Implementation Options TxOP probabilities, contention offsets, non-decrementing offsets, centralized and autonomous adaptation IBSS: default parameters, local adaptation of CO/CW Compatibility, Transparency With legacy, HCF, bursting techniques Implementation Options Scheduler, Tx selection method

References Pdcf: 467r1 TCMA: 456, 457, 01-002, 003, 004 Vdcf: 412r1, 429, 399