Multiple Frame Exchanges during EDCF TXOP Month 1998 doc.: IEEE 802.11-98/xxx November 2001 Multiple Frame Exchanges during EDCF TXOP Sunghyun Choi1, Javier del Prado1, Atul Garg1, Maarten Hoeben3, Stefan Mangold2, Sai Shankar1, and Menzo Wentink3 Philips1, Aachen University2, and Intersil3 sunghyun.choi@philips.com and mwentink@intersil.com S. Choi, Philips & M.M. Wentink, Intersil

November 2001 Problem Statement Per 802.11e/D1.3, it is clear that one cannot have multiple frame (i.e., MSDU) exchanges during a non-polled TXOP (or EDCF TXOP). 802.11e/D1.2 was not very clear in that; see 01/534 for related discussion. However, allowing the multiple frame exchanges (or EDCF TXOP Bursting) looks very attractive. See the next for the details. S. Choi, Philips & M.M. Wentink, Intersil

Advantages of EDCF TXOP Bursting November 2001 Advantages of EDCF TXOP Bursting Will reduce network overhead Without bursting available, an ESTA must backoff after each MSDU transmission Will increase bandwidth fairness among the same priority queues, virtually independent from the frame sizes. Without bursting available, the ESTA with larger MSDUs will use the channel more Should not affect the rest of HCF as the EDCF TXOP is limited by “CP TXOP Limit” in QoS Parameter Set element anyway. S. Choi, Philips & M.M. Wentink, Intersil

Proposed EDCF TXOP Bursting November 2001 Proposed EDCF TXOP Bursting During an EDCF TXOP, ESTA may transmit multiple frames (i.e., MSDUs) from the same queue (i.e., from the same Access Category per 01/565r0). Once there is a transmission failure, the EDCF TXOP ends, and the ESTA goes into backoff. Without a transmission failure, the ESTA goes to backoff after the final frame exchange. S. Choi, Philips & M.M. Wentink, Intersil

November 2001 Duration and NAV Rules EDCF bursting uses Duration rules similar to fragment bursting Each MPDU protects up to the next frame exchange via Duration. S. Choi, Philips & M.M. Wentink, Intersil

November 2001 EDCF TXOP Limit per AC Replace the “CP TXOP Limit” in QoS Parameter Set element with four “CP TXOP Limit [AC]’s” One per Access Category (AC) (ref. 01/565r0) Desirable along with the EDCF TXOP bursting Will enable bursting size tuning per AC depending on the traffic types Can achieve weighted bandwidth sharing among ACs S. Choi, Philips & M.M. Wentink, Intersil