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Managed and un-managed Wireless LANs

Managed and un-managed Wireless LANs. Authors:. Date: 2007-12-17. Abstract. This contribution describes the differences of the managed and un-managed Wireless LANs; and presents their implications on 802.11 VTS SG PAR scope definitions. Variations in Wireless LAN environments.

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Managed and un-managed Wireless LANs

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  1. Managed and un-managed Wireless LANs Authors: Date: 2007-12-17 Xiaojun Ma, Thomson Inc.

  2. Abstract This contribution describes the differences of the managed and un-managed Wireless LANs; and presents their implications on 802.11 VTS SG PAR scope definitions. Xiaojun Ma, Thomson Inc.

  3. Variations in Wireless LAN environments • Various physical setups: • in-door/out-door • home/enterprise • big/small coverage • Various service setups: • data-only / triple-plays • free / pay services • large / small user groups Xiaojun Ma, Thomson Inc.

  4. Technical view of WLAN variations • Managed WLANs • Having exclusive right to the hotspots • Network planning to avoid interference from BSS overlapping • Channel selection • Power control • Smart antenna – beam forming • AP collaboration • Examples: big public hotspots, stadium, airport, some enterprises • Unmanaged WLANs • Having no exclusive right to the hotspot or its neighborhood areas • Network planning is automatic and/or policy based • Interference exists • Coverage is varying from location to location (user number and area size) • Examples: home, small hotspots, e.g. Starbucks Xiaojun Ma, Thomson Inc.

  5. Managed WLANs • Features • Interference is insignificant • Wall crossing is not a big issue • Fading and multipath may be still significant • Requirements • Scalability and bandwidth efficiency are crucial as the number of users is big • QoS control is crucial as video content should be stably offered • Approaches • Broadcast/multicast is required for scalability • Multicasting video preempt data may be required (just diffserve is not enough) Xiaojun Ma, Thomson Inc.

  6. Unmanaged WLANs • Features • Interference is significant as there are many contributors, such as neighbour WLANs, Microware owen, cordless phone etc… • Wall crossing and blind spots are big issues • Fading is insignificant • Requirements • Scalability and bandwidth efficiency are minor • QoS control is important for triple-play • Interference avoidance • Approaches • Uni-casting may be used at link layer • Diffserv may be good enough to support QoS of video part Xiaojun Ma, Thomson Inc.

  7. Suggestion on PAR scopes • Change #3 • Increased robustness in overlapping BSS environments, based upon enhancing existing 802.11 mechanisms without the requirement for a centralised management entity. • To • Increased robustness in overlapping BSS environments • Leaving rooms for possible centralized solution (managed network) or policy based collaboration solution (un-managed network) Xiaojun Ma, Thomson Inc.

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