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OBSS issue in 802.11ac

OBSS issue in 802.11ac. Date: 2009-05-11. Authors:. Introduction. More than 1 GBps throughput with multiple STAs and more than 500Mbps throughput for each STA are required in 11ac. Following new technologies are likely to be used Higher order MIMO (> 4x4)

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OBSS issue in 802.11ac

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  1. OBSS issue in 802.11ac Date: 2009-05-11 Authors:

  2. Introduction • More than 1 GBps throughput with multiple STAs and more than 500Mbps throughput for each STA are required in 11ac. • Following new technologies are likely to be used • Higher order MIMO (> 4x4) • Spatial Division Multiple Access (SDMA) with more than 4 AP antennas • Larger Bandwidth (80 MHz mode) • Multi frequency channel • Use multiple 20 MHz channels across multiple users. • Increase in the number of APs / STAs is expected.

  3. Background Giga-bit wired network is proliferating. Giga-bit wireless access is very attractive for both the very high data rate services such as IP-TV. Efficient aggregation function isattractive for low data rate services also such as VoIP services. 10000 Further increase in the throughput might be expected. 10GBase-T USB3.0 802.11ac 1000Base-T USB2.0 1000 802.11n 100Base-T 100 11ac is expected to cover from low data rate services to very high data rate services. Ethernet 802.11a Throughput (Mbps) USB 10Base-T USB1.1 802.11b 10 WLAN 1Base-T WPAN USB1.0 802.11 1 0.1 1975 1985 1995 2005 2015 Year

  4. AP AP AP AP AP AP AP AP AP Proliferation of WLANs Large increase in the number of APs / STAs is expected. 802.11ac AP

  5. Number of available channels in 5GHz band 80MHz mode Over size MIMO SDMA/OFDMA Others Only 4 channels can be used for 80MHz mode while 9 / 19 channels are available for 40 / 20 MHz mode. Frequency band allocation in Japan 20MHz mode 40MHz mode 80MHz mode 5

  6. IEEE802.11a/n/ac IEEE802.11ac AP1 AP2 BSS1 BSS2 Overlapped BSS STA11 STA21 STA22 OBSS in 802.11ac OBSS scenario is more likely to happen in 11ac compared to 11n due to limited . We think addressing OBSS issue in TGac is important because it highly relates to the spatial domain control. Example: Excessive NAV setting might affect throughput in the adjacent BSS.

  7. IEEE802.11a/n/ac IEEE802.11ac AP1 AP2 BSS1 BSS2 Overlapped BSS STA11 STA21 STA22 Possible Simulation Scenario We think OBSS situation should be included in “Functional Requirements and Evaluation Methodology. ” • Example of Evaluation Conditions • Number of APs = 2 • Case 0: AP1:11n, AP2:11n • Case 1: AP1:11ac, AP2: 11n • Case 2: AP1: 11ac, AP2: 11ac • Location of APs: T.B.D. • Location of STAs: T.B.D. • Traffic from AP to STAs: T.B.D. • Traffic from STAs to AP: T.B.D. • Channel model type applied : T.B.D. • Possible Requirements • Case 1 and Case2: • Throughput at each AP must be equal to or higher than that of case 0.

  8. Conclusions • Large number of APs / STAs is expected in 802.11ac. • OBSS is more likely to happen in 802.11ac compared to 802.11n. • We propose addressing for OBSS issue in TGac. We also suggest the following functional requirement. “802.11ac shall maintain or increase throughput of each BSS in OBSS when some of 802.11a/n BSSs are replaced by 802.11ac BSSs.”

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