160 MHz PHY Transmission Date: 2010-03-17 Authors: March 2010 Month Year doc.: IEEE 802.11-yy/xxxxr0 March 2010 160 MHz PHY Transmission Date: 2010-03-17 Authors: Youhan Kim, et al. John Doe, Some Company

Outline Motivation Usefulness of 160 MHz PHY transmission mode March 2010 Outline Motivation Usefulness of 160 MHz PHY transmission mode Contiguous and non-contiguous 160 MHz Coexistence Summary Youhan Kim, et al.

March 2010 Motivation (1/2) WLAN continues to provide wireless alternatives to wired LAN 10BASE-T Ethernet: 11a/g 100BASE-T Ethernet: 11n Ability to meet the 1000BASE-T Ethernet throughput (Gigabit wireless) in 11ac would be beneficial Parallelism with past efforts lends additional legitimacy to 11ac Could be a clear and simple part of the answer to “what is 11ac?” Including this capability increases the chance of a major upgrade cycle, and provides better differentiation with previous generation equipments Youhan Kim, et al.

March 2010 Motivation (2/2) However, for Gigabit wireless to succeed, it needs to be practical Achieve 1Gb/s TCP/IP throughput robustly over a reasonable range Allow wide range of devices, each with different physical limitations (e.g number of antennas), to achieve 1 Gb/s TCP/IP throughput We believe this capability would be instrumental in broader acceptance of 11ac by consumers Youhan Kim, et al.

Usefulness of 160 MHz PHY Transmission March 2010 Usefulness of 160 MHz PHY Transmission WLAN is becoming prevalent in all types of devices Different devices have different physical (e.g. number of antenna) limitations 160 MHz allows even wider range of devices to achieve Gigabit wireless Opens the door for even more variety of applications # Streams MCS BW #data tones / symbol MAC Throughput* 8 256-QAM 5/6 40 MHz 108 1.12 Gbps 4 80 MHz 234+ 1.21 Gbps 3 64-QAM 5/6 160 MHz 468+ 1.37 Gbps 2 * Short GI, 70 % MAC efficiency + Tentative numbers. Exact number TBD. Youhan Kim, et al.

Benefits of Wide Bandwidth March 2010 Benefits of Wide Bandwidth A wide channel shared among multiple users is more efficient for transporting bursty computer networking data Modern media codecs use variable bit rates Wide shared channels are more efficient due to statistical multiplexing Streams with highly varying bit rate may be more robust with wide channels Allows sufficient excess BW to meet the peak requirements Particularly with prioritized QoS Spectrum that is not used is permanently wasted Youhan Kim, et al.

Contiguous and Non-Contiguous 160 MHz March 2010 Contiguous and Non-Contiguous 160 MHz Contiguous 160 MHz Transmitted signal consists of a single contiguous frequency spectrum with 160 MHz bandwidth Non-contiguous 160 MHz Transmitted signal consists of two frequency segments, each 80 MHz wide Limit to two non-contiguous segments for reasonable tradeoff between complexity and flexibility WLAN - 160 MHz U-NII 1 U-NII 2 U-NII Worldwide U-NII 3 WLAN - 160 MHz Radar Radar WLAN WLAN 80 MHz WLAN 80 MHz U-NII 1 U-NII 2 U-NII Worldwide U-NII 3 Youhan Kim, et al.

March 2010 Non-Contiguous 160 MHz When the two frequency segments are placed next to each other, a non-contiguous 160 MHz device and a contiguous 160 MHz device shall be interoperable The two frequency segments are used synchronously Both in TX or both in RX mode Signal on the two segments are destined to the same receiver(s) WLAN - 160 MHz Radar Radar WLAN WLAN 80 MHz WLAN 80 MHz U-NII 1 U-NII 2 U-NII Worldwide U-NII 3 Youhan Kim, et al.

Contiguous and Non-Contiguous 160 MHz March 2010 Contiguous and Non-Contiguous 160 MHz Contiguous 160 MHz Suitable for devices with limitation on complexity, area, power, etc. Non-contiguous 160 MHz Higher probability of being able to operate in wide bandwidth mode [1] Able to move around 80 MHz segments to avoid radar and WLAN Able to utilize U-NII 3 More effort and cost required to build than contiguous 160 MHz devices To allow different implementations to independently decide on the tradeoffs between contiguous and non-contiguous operation Allow 160 MHz devices that support only contiguous 160 MHz operation 160 MHz devices may optionally support non-contiguous 160 MHz operation as well WLAN - 160 MHz Radar Radar WLAN WLAN 80 MHz WLAN 80 MHz U-NII 1 U-NII 2 U-NII Worldwide U-NII 3 Youhan Kim, et al.

Coexistence Not as hard as 11n at 2.4GHz March 2010 Coexistence Not as hard as 11n at 2.4GHz No 11b and Bluetooth No partially overlapping channels (i.e., 5MHz channel spacing at 2.4GHz) No limited capabilities of pre-standard 11ac devices (as in 11n) Various mechanisms may be investigated to ensure coexistence with legacy devices (11a/n) Some examples of existing 11n mechanisms Immediate CCA sensing on all BW units RTS/CTS protection L-SIG spoofing Intolerant bit Some examples of possible new mechanisms Channel activity profiling on extension channels More information exchanges between AP and STA on channel profiling Ability to reserve certain channels for high QoS data Youhan Kim, et al.

March 2010 Summary 160 MHz PHY transmission would be a valuable optional feature in 11ac Allows even wider range of devices to achieve Gigabit wireless Allow both contiguous and non-contiguous 160 MHz operation Non-contiguous and contiguous modes shall interoperate when the two 80 MHz non-contiguous segments are placed next to each other Allow 160 MHz devices that support only contiguous 160 MHz operation Allow each implementation to independently decide on the tradeoffs between contiguous and non-contiguous operation Youhan Kim, et al.

March 2010 References [1] Cariou, L. and Benko, J., Multichannel transmissions, IEEE 802.11-10/0103r1, Jan. 2010 Youhan Kim, et al.