IEEE 802.11-15/1369r1 Random Access Based Buffer Status Report
Explore the IEEE 802.11-15/1369r1 document discussing buffer status reports in 11ax. The report scheme, considerations on proposed BSR, necessity of random access, and fair UL MU transmission are covered. Understand the random access nature of BSR and its importance for equal opportunity in MU transmission.
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November 2015 doc.: IEEE 802.11-15/1369r1 Random access based buffer status report Date: 2015-11-12 Authors: Name Woojin Ahn Affiliations Address Yonsei University Yonsei University Korea National University of Transportation Phone email woozzas@yonsei.ac.kr gumgoki@yonsei.ac.kr Jinsoo Ahn ronnykim@ut.ac.kr Ronny Yongho Kim Submission Slide 1 Woojin Ahn, Yonsei Univ.
November 2015 doc.: IEEE 802.11-15/1369r1 Buffer Status Report in 11ax Buffer status report scheme was agreed in the last meeting[1] A BS report frame can be any frame that contains QoS Control field AP elicits for BS reports via the Trigger frame It is also allowed that STAs send BSR in unsolicited manner AP might save BSRs on its UL data queue B e a c o n QoS Data A c k Tri gg er A c k Tri gg er QoS Data/ Null BA/QoS Data DL Data 3 B A QoS Data QoS Data DL Data 5 BA/QoS Data MU SU Buffer Status Report Submission Slide 2 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Considerations on the proposed BSR For any UL STAs, it is necessary to deliver BSR to be assigned in UL MU transmission Not every STA is allowed to send BSR Impossible for AP to solicit BSR for every associated STAs with trigger frames Only those who granted resource by contention can get chances for BSR in unsolicited manner What about the others? STA1 BSR STA1 STA2 STA5 (DL) STA5 (UL) Trigger Trigger STA3 STA4 STA5 MBA MBA MBA ACK STA2 STA4 STA6 (DL) STA6 (UL) STA3 STA6 STA3 STA3 STA3 STA6 STA2 STA2 STA2 STA5 STA4 UL data queue STA1 STA1 STA4 STA1 STA1 STA2 STA3 STA4 STA5 STA6 ? STA7 STA8 STA9 STA10 Submission Slide 3 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Necessity of random access BSR Opportunity for BSR needs to be equalized In order to provide better fairness for UL MU transmission, random access of BSR can be considered PCF-like BS polling may require excessive delay BSR RA BSR Col 10 STA5 (DL) STA5 (UL) STA1 STA1, 2, 3, 4, 5, 6, 8, 9, 10 Trigger Trigger Trigger 8 MBA MBA MBA MBA ACK STA2 STA4 Col Col STA6 (DL) STA6 (UL) STA3 9 STA3 STA3 STA3 STA6 STA3 STA6 STA8 STA9 STA10 STA2 STA2 STA2 STA5 STA4 STA2 STA5 STA4 UL data queue STA1 STA1 STA4 STA1 STA1 Submission Slide 4 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Random Access BSR AP triggers RA BSR with TF-R AP might choose whether it trigger RA BSR or not Depending on UL data queue Not mandatory for every UL MU transmission STAs transmit BSR through randomly chosen RU for RA AP acknowledges the result of RA BSR AP may decide whether it triggers UL Data transmission right after RA BSR or not, depending on the UL queue status RA BSR can be also useful, when AP has no information on UL data to trigger at all Relatively small amount (# of STAs or datasize) of data is required, instantly, for UL MU transmission More flexible and efficient resource use Slide 5 Submission Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Expected form of RA BSR AP might allow the whole channel solely for RA BSR STAs might send BSR with QoS Data/Null format with fixed datasize and MCS AP cannot differentiate MCS for random-accessing STAs RA BSR can be triggered with UL data as well Random-accessing STA may add fragmented UL data within given duration Indication method for RA BSR must be defined RA BSR is another type of UL MU frames Data AIDx, QoS Data/Null AIDx, QoS Data/Null collision AIDy, QoS Data/Null collision collision AIDz, QoS Data/Null collision collision AIDw, QoS Data/Null BSR/Data) collision TF-R (RA (RA BSR/Null) Data AIDy, QoS Data/Null collision collision TF-R TF Data Submission Slide 6 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Indication for RA BSR in TF Indication for RA BSR Option 1) 1-bit indication in common info field Small overhead Not applicable for mixed case of RA BSR and UL data Option 2) indication bit for each perSTA info field Easy to coexist with other types of UL MU frames Relatively large overhead Option 3) Assigning a reserved AID for RA BSR Similar with AID 0 in TF-R No overhead required Scalability of AID must be further considered Submission Slide 7 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Conclusion BSR scheme in 11ax might cause unfairness problem in terms of opportunity for UL transmission Random Access BSR can be considered as an additional option for relieving mentioned problem Submission Slide 8 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Strawpoll Do you agree to add to the TG Specification Frame work document? 4.x.y AP may transmit Trigger Frame to elicit buffer status report using random access Submission Slide 9 Woojin Ahn (Yonsei Univ.)
November 2015 doc.: IEEE 802.11-15/1369r1 Reference [1] 11-15-1120-00-00ax-buffer-status-report Submission Slide 10 Woojin Ahn (Yonsei Univ.)
