July 2007doc.: IEEE 802.11-07/2088r0

IEEE P802.11
Wireless LANs

LB97 HCCA Comment Resolution
Date: 2007-07-11
Author(s):
Name / Company / Address / Phone / email
Matthew Fischer / Broadcom / 190 Mathilda PlaceSunnyvale, CA94040 / +1 408 543 3370 /
Subra Parameswaran / Broadcom / 190 Mathilda PlaceSunnyvale, CA94040 / +1 408 922 5415 /

General discussion:

HCCA

CID 431

Comment: Change the second paragraph of 9.9.3.2 as follows:" What is being changed here? I see no underline text, no strike-through text.
Proposed Change: "Properly show what the changes are to be."

Suggested Resolution: Accept. Remove the changes to clause 9.9.3.2.

CID 649: Clause 9.9.3.2, Page 115, Line 56

Comment: "This change effectively removes the 2nd item of itemized list in this paragraph, which changes the integrity of the section."

Proposed Change: Take out this change.

Suggested Resolution: See proposed resolution for CID 431.

CID 3002: Clause 9.9.3.2, Page 115, Line 56

Comment: "This change effectively removes the 2nd item of itemized list in this paragraph, which changes the integrity of the section."

Proposed Change: "Remove this change."

Suggested Resolution: Accept. See proposed resolution for CID 431.

CID 1234: Clause: 9.3.3, Page 115, Line 54

Comment: "Add admission process option as QoS class for HT scheduled transmissions. High throughput (particularly with aggregation in mixed mode HCCA and EDCA operation at high loading levels will increase time for new session to enter. This can be ameriorated by instituting an alternate admission mechanism in the CFP. No change in draft text detected; suggest contribution to demonstrate that additional streams setup delay vs. loading for the current admission scheme vs. separate admission process as special QoS class."

Proposed Change: "Include separate contention-control frame as special QoS class in CFP coupled with RR response for systems that use HT scheduler, HCCA, and polling as separate admission process."

Suggested Resolution:Rejected. There are several mechanisms thatthe HCCA scheduler may choose to minimize thesetup delay for streams. It may establish admission control for AC_VO access category in order tocontrol the traffic belonging to this access category.The ADDTS Request QoS Action frame is a management frame that is transmitted under AC_VO without admission control restrictions improving its chances of being able to setup traffic streams with low latency. Other schemes, where the HCCA scheduler periodically polls associated STAs, which have not yet setup TS is also possible.

431 / 115.56 / 9.9.3.2 / Change the second paragraph of 9.9.3.2 as follows:" What is being changed here? I see no underline text, no strike-through text. / "Properly show what the changes are to be." / Accept. Remove the changes to clause 9.9.3.2.
649 / 115.56 / 9.9.3.2 / "This change effectively removes the 2nd item of itemized list in this paragraph, which changes the integrity of the section." / Take out this change. / Accept. See resolution of CID 431.
3002 / 115.56 / 9.9.3.2 / "This change effectively removes the 2nd item of itemized list in this paragraph, which changes the integrity of the section." / "Remove this change." / Accept. See resolution of CID 431.
1234 / 115.54 / 9.9.3 / "Add admission process option as QoS class for HT scheduled transmissions. High throughput (particularly with aggregation in mixed mode HCCA and EDCA operation at high loading levels will increase time for new session to enter. This can be ameriorated by instituting an alternate admission mechanism in the CFP. No change in draft text detected; suggest contribution to demonstrate that additional streams setup delay vs. loading for the current admission scheme vs. separate admission process as special QoS class." / "Include separate contention-control frame as special QoS class in CFP coupled with RR response for systems that use HT scheduler, HCCA, and polling as separate admission process." / Rejected. There are several mechanisms thatthe HCCA scheduler may choose to minimize thesetup delay for streams. It may establish admission control for AC_VO access category in order tocontrol the traffic belonging to this access category.The ADDTS Request QoS Action frame is a management frame that is transmitted under AC_VO without admission control restrictions improving its chances of being able to setup traffic streams with low latency. Other schemes, where the HCCA scheduler periodically polls associated STAs, which have not yet setup TS is also possible.

References:

Submissionpage 1Matthew Fischer, Broadcom