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Sub 1 GHz license-exempt MAC areas to consider

Sub 1 GHz license-exempt MAC areas to consider. Authors:. Date: 2010-09-06. Start a discussion on areas of the MAC that we may want to address. Abstract. This amendment also adds support for: - transmission range up to 1 km - data rates > 100 kbit /s

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Sub 1 GHz license-exempt MAC areas to consider

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  1. Sub 1 GHz license-exemptMAC areas to consider Authors: Date: 2010-09-06 David Halasz, OakTree Wireless

  2. Start a discussion on areas of the MAC that we may want to address. Abstract David Halasz, OakTree Wireless

  3. This amendment also adds support for: - transmission range up to 1 km - data rates > 100 kbit/s while maintaining the 802.11 WLAN user experience for fixed, outdoor, point to multi point applications. Excerpts from PAR David Halasz, OakTree Wireless

  4. Issue: The supported rates element has a resolution of 500 kb/s. But the IEEE 802.11 S1G PAR has data rates > 100 kbit/s • IEEE 802.11n addressed this for very large rates. Can do something similar for low data rates. • See table 7-26a of IEEE Std 802.11n-2009 Supported Rates element David Halasz, OakTree Wireless

  5. Issue: Fragmentation helps with large packets at low data rates but does not use a block ack mechanism • IEEE Std 802.11e-2005 and IEEE Std 802.11n-2009 have block ack mechanism for aggregation • A possible optimization is to fragment and then use IEEE Std 802.11e-2005 block ack mechanism • Desire IEEE Std 802.11e-2005 block ack since want training fields Fragmentation and Aggregation David Halasz, OakTree Wireless

  6. Issue: Systems designers with short, bursty traffic devices may desire higher number of associations per AP. The standard supports up to 2007 associations. With 2007 associations, the max size of the TIM is 251 octets. It doesn’t appear practical to simply make the TIM larger. With a two level structure (page number and bitmap) the problem can be avoided. Number of associations David Halasz, OakTree Wireless

  7. Issue: With larger number of clients, in an outdoor environment, the likelihood of hidden nodes and collisions goes up. Existing mechanisms, such as HCCA, can be used to mitigate hidden nodes within a cell. Collision domain David Halasz, OakTree Wireless

  8. Issue: Low throughput devices may desire large sleep time. For instance, greater than 15 minutes. Mechanisms, such as S-APSD, are typically for applications such as voice and video that have much shorter sleep times. Power Save Queue Time Life David Halasz, OakTree Wireless

  9. 11-10-0001-13-0wng-900mhz-par-and-5c • https://mentor.ieee.org/802.11/dcn/10/11-10-0001-13-0wng-900mhz-par-and-5c.doc References David Halasz, OakTree Wireless

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