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Connectivity in 802.11a

Connectivity in 802.11a. Steve Halford Jim Zyren. Goal. Gauge the level of support for modifications to increase range and market acceptance of 802.11a Simple Modifications Low complexity. Performance Issues for 802.11a. 802.11a offers advantages over 2.4 GHz

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Connectivity in 802.11a

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  1. Connectivity in 802.11a Steve Halford Jim Zyren Steve Halford, Intersil

  2. Goal • Gauge the level of support for modifications to increase range and market acceptance of 802.11a • Simple Modifications • Low complexity Steve Halford, Intersil

  3. Performance Issues for 802.11a • 802.11a offers advantages over 2.4 GHz • Currently less ‘crowded’ with interference • Offers more channels for re-use • Better Throughput for equivalent data rates • Smaller preamble • Shorter Slot intervals • 802.11a range is less than 802.11b/g range • Higher theoretical path loss at 5 GHz • Confirmed by testing of available 802.11a & 802.11b/g equipment Steve Halford, Intersil

  4. Importance of Connectivity • Basic connectivity may not be possible in 802.11a • Test show that 6 Mbps range is much less than range of 1 & 2 Mbps • Higher loss & higher SNR required • Why is this a problem? • For home networks -- Range equals Performance • Home networks are fed by internet connections @ rates < 2Mbps • Higher throughput not required • Complete coverage of home is critical • Small enterprise applications need coverage • Small number of AP’s is desired • Users expect rates comparable to their home networks • Check e-mail & IM don’t require 54 Mbps type rates Steve Halford, Intersil

  5. Problem • The range issues of 802.11a will become very clear to users • 802.11b users will expect same range with higher data rates • 802.11g users will enjoy 54 Mbps data rates & have the connectivity of 802.11b • Range issue could overwhelm the advantages of the 5 GHz spectrum! Steve Halford, Intersil

  6. How can we solve the range problem? • Increased Coding • Lower rate, better range • Could be as simple as repetition coding • Or, could add interleaver & outer block code • Ex: Reed-Solomon outer code • Expand 802.11b to 5 GHz band • Make 5 GHz look a little like 802.11g • Longer preamble • More robust initial detection • Enable the practical use of spatial diversity • Even simple switch diversity is a problem for 802.11a Steve Halford, Intersil

  7. Suggested Straw Poll “Should IEEE802.11 consider enhancements to improve the range of 802.11a?” • Yes • No • Abstain • 15/17/13 Steve Halford, Intersil

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