HCF Duration Field Set Rules

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Presentation transcript:

HCF Duration Field Set Rules Month 1998 doc.: IEEE 802.11-98/xxx July 2002 HCF Duration Field Set Rules Sunghyun Choi*, Javier del Prado* Srini Kandala+, Adrian Stephens- *Philips Research USA, +Sharp Labs, -Mobilian S. Choi, Philips, et al.

July 2002 Background 802.11e/D3.0 has inconsistent descriptions about Duration/ID field values in different frame types This presentation will serve an illustrative explanation for the Duration/ID field set rule The normative text is found in 02/444r0 S. Choi, Philips, et al.

July 2002 EDCF TXOP S. Choi, Philips, et al.

July 2002 Comments Any frame by TXOP holder within EDCF TXOP: covers till the end of the next MPDU transmission if any; can vary depending on the ACK policy of the MPDU Any frame by receiver (e.g., ACK, CTS, QoS CF-ACK, and BurstAck): the Dur/ID value in the previous frame minus (the frame transmission time + SIFS) Last frame by TXOP holder within EDCF TXOP: covers till the end of the corresponding ACK if any S. Choi, Philips, et al.

HC’s Downlink Transmissions July 2002 HC’s Downlink Transmissions S. Choi, Philips, et al.

Comments The Duration/ID set rule is the same as EDCF TXOP July 2002 S. Choi, Philips, et al.

July 2002 Polled TXOP S. Choi, Philips, et al.

Comments QoS (+)CF-Poll: Polled TXOP Limit + aSlotTime July 2002 Comments QoS (+)CF-Poll: Polled TXOP Limit + aSlotTime Any frame by TXOP holder including RTS and CTS (except for last frame): the remaining time till the end of the polled TXOP + aSlotTime Any frame by receiver (i.e., ACK, CTS, or QoS CF-ACK): the Dur/ID value in the previous frame minus (the frame transmission time + SIFS) QoS Null as the last frame by TXOP holder : zero duration value to indicate returning the residual TXOP to the HC S. Choi, Philips, et al.

RTS/CTS before Polled TXOP July 2002 RTS/CTS before Polled TXOP S. Choi, Philips, et al.

July 2002 Comments RTS before QoS (+)CF-Poll: the remaining time till the end of the expected QoS (+)CF-Poll; conform with the HC downlink frame rule The rest is the same as Polled TXOP rule S. Choi, Philips, et al.

Special Cases in EDCF TXOP July 2002 Special Cases in EDCF TXOP BurstAckReq frame Duration = ACK + SIFS BurstAck frame transmitted when immediate policy is not used CC frame? S. Choi, Philips, et al.