UL-MU Overheads in IEEE 802.11-15/0064r1 Document
Delve into the challenges and considerations surrounding UL-MU overheads discussed in the January 2015 IEEE document authored by Tomoko Adachi from Toshiba. The document explores the complexities of UL-MU synchronization, transmission phases, and comparison of methods for achieving efficient data transmission in a wireless network context.
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January 2015 doc.: IEEE 802.11-15/0064r1 Consideration on UL-MU overheads Date: 2015-01-12 Authors: Name Tomoko Adachi Affiliations Address Toshiba Corporation Toshiba Corporation Cisco Systems Phone email tomo.adachi@toshiba.co.jp hiroki2.mori@toshiba.co.jp Hiroki Mori brianh@cisco.com Brian Hart coffey@realtek.com Sean Coffey Realtek sschelstraete@quantenna.co m Yuichi.Morioka@eu.sony.c om hiertz@ieee.org Sigurd Schelstraete Quantenna Yuichi Morioka Sony Guido Hiertz Ericsson Submission Slide 1 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Abstract This presentation considers impact of UL-MU overheads. Submission Slide 2 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 UL-MU UL-MU is more difficult than DL-MU because STAs have to synchronize their transmissions. The easiest way to achieve synchronization is by an AP s support. But the AP doesn t really know which STA has data to transmit. To find out STAs transmission demands, asking one by one is the steadiest way, but that will be a large overhead. On the other hand, if we can do UL MU transmission for data, then response frames can also be in MU transmission. Submission Slide 3 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 UL-MU Assume to divide into 3 phases for UL-MU transmission. UL data transmission phase DL response phase Initial phase Submission Slide 4 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Initial phase Both exchanges in legacy rate (24 Mbps) Assume two approaches ref. doc.11-14/0598 AP asks STAs one by one if they have Tx demands method 1 method 2 AP Poll Poll CTS Inquiry Inquiry Inquiry RTS QoS CF-Poll STA 1 TxReq Resp. CTS RTS to N_m STAs STA 2 Resp. STA N_m Resp. N_m: number of STAs multiplexed (4) Note: above conventional frames were used as substitutes for throughput calculation (may be too convenient) Submission Slide 5 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 DL response phase Assume two approaches BA to all N_m STAs by DL-MU All exchange in legacy rate (24 Mbps) method A method B AP BA BA BA BA STA 1 BAR STA 2 BAR STA N_m BAR N_m: number of STAs multiplexed (4) Submission Slide 6 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Comparison cases UL data transmission phase DL response phase Initial phase Throughput comparison on DL response phase methods (method 1-A and 1-B) method 1 method A method 2 method B Throughput comparison on initial phase methods (method 1-B and method 2-B) Submission Slide 7 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Throughput calculation N_m: number of STAs multiplexed (and also inquired for method 1) (4) assumed OFDMA using short GI for MU transmission TXOP limit = 0 20 MHz bandwidth, 1SS, MCS 8 assumed 24 us for HE preamble part (+4 us to VHT preamble) full buffer, error free Submission Slide 8 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Throughput comparison on DL response phase methods Initial phase: method 1 DL response phase: method A vs. method B Submission Slide 9 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Throughput comparison on initial phase methods Initial phase: method 1 vs. method 2 DL response phase: method B Submission Slide 10 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 From the results DL BA responses after UL-MU transmission should be multiplexed (in some way, such as transmit in DL MU or extend BA frame format to carry multiple STAs responses). Initial phase prior to UL-MU transmission should be simple. Need to find a more rough way to grasp or estimate TX demands. Submission Slide 11 Tomoko Adachi, Toshiba
January 2015 doc.: IEEE 802.11-15/0064r1 Straw Poll Do you agree to include in the specification framework a mechanism by which DL BA/ACKs, in responses to UL MU transmission, are multiplexed eg. DL MU-MIMO, DL-OFDMA, single PSDU Yes: 60 No: 1 Abstain: 51 Submission Slide 12 Tomoko Adachi, Toshiba
