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Backward Compatibility Case Studies

Explore adaptive channel reallocation methods for improved compatibility between legacy and modern wireless systems. This study presents case scenarios and methods to ensure smooth integration in enterprise, hot spot, and home environments.

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Backward Compatibility Case Studies

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  1. Backward CompatibilityCase Studies Eldad Perahia (Cisco Systems) Adrian Stephens (Intel) Sean Coffey (TI) Eldad Perahia, Cisco Systems

  2. Enterprise Scenario • Initial State • 3 Channels of 802.11g • 19 Channels of 802.11a/h • Example New State • 3 Channels of 802.11g • 19-N Channels of 802.11a/h • N Channels of 802.11n/h • The IT manager would use a RRM tool to reallocate the channels. Eldad Perahia, Cisco Systems

  3. Enterprise Scenario (Access Points) • 802.11n/h Access Points • Be able to detect legacy clients and access points operating in their channels and report that information to the RRM tool. • Communicate with legacy clients and move them to channels served by legacy access points. • 802.11a/h Access Points • Continue to operate as they had before the installation of the new 802.11n systems. Eldad Perahia, Cisco Systems

  4. Enterprise Scenario (Clients) • 802.11n/h Clients 1. Search for 802.11n access points. If they fail to find them, search for legacy access points and operate in a fallback mode. • 802.11a/h Clients • Continue to operate as they had before the installation of the new 802.11n systems. Eldad Perahia, Cisco Systems

  5. Hot Spot Scenario (Airport) • Initial State • Many different types of legacy systems • 3 Channels of 802.11g • 1-19 Channels of 802.11a/h • Many different networks • Service providers, security, baggage handling, vendors, passengers in ad-hoc mode. • New State • Service provider adds 802.11n/h access points. Eldad Perahia, Cisco Systems

  6. Hot Spot Scenario (Access Points) • 802.11n/h Access Points • Scan all channels to find the cleanest one(s). • Present scan results to the service provider along with suggested channels. • Three potential situations in which channel(s) are used and the modes are operated in: • 11n only operation • Fallback mode (802.11g or 802.11a/h) • Dual – mode operation (802.11a/h or 802.11n/h) • If it detects legacy clients on its channel, try to move those clients to another channel. • If it detects legacy access points on its channel, update the “cleanest channel” information. Eldad Perahia, Cisco Systems

  7. Hot Spot Scenario (Clients) • 802.11n/h Clients 1. Search for 802.11n access points. If they fail to find them, search for legacy access points and operate in a fallback mode. • 802.11a/h Clients 1. Continue to operate as they had before the installation of the new 802.11n systems. Eldad Perahia, Cisco Systems

  8. Home Scenario #1 • Initial State • No 802.11 network. • New State • Consumer adds 802.11n/h BB Gateway and 802.11n clients • AP Behavior • Scan all available channels to find the cleanest ones (The neighbors may operate WLANs) • Operate in 802.11n/h mode (do not communicate with any legacy equipment) • Client Behavior 1. Search for 802.11n access points. If they fail to find them search for legacy access points and operate in a fallback mode. Eldad Perahia, Cisco Systems

  9. Home Scenario #2 • Initial State • 802.11a/h access point, 802.11g access point, dual-mode clients. • New State • Consumer adds 802.11n/h BB Gateway and 802.11n clients Eldad Perahia, Cisco Systems

  10. Home Scenario #2 (Access Points) • 802.11n/h Access Points • Scan all channels to find the cleanest one(s). • Present scan results to the consumer along with suggested channels. • Three potential situations in which channel(s) are used and the modes are operated in: • 11n only operation (With the ability to move legacy equipment off the 802.11n channels) • Fallback mode (802.11g or 802.11a/h) • Dual – mode operation (802.11a/h or 802.11n/h on the same channel). Eldad Perahia, Cisco Systems

  11. Home Scenario #2 (Clients) • 802.11n/h Clients • Search for 802.11n access points. If they fail to find them, search for legacy access points and operate in a fallback mode. • Legacy Dual-Mode Clients • Continue to operate as they had before the installation of the new 802.11n systems. • If the 802.11n access point moves them to another channel, do so. Eldad Perahia, Cisco Systems

  12. Access Point Summary • Mandatory Behavior • Scan all available channels to find the cleanest channel(s) • Have the ability to fall back to 802.11 a/g • Have the ability to detect legacy clients and access points when operating in HT mode. • Highly Desirable Behavior • Have the ability to move legacy clients to another channel (Ent., Hot Spot, Home) • Desirable Behavior 1. Have the ability to communicate with both legacy and 802.11n clients on the same channel (Home & Hot Spot) Eldad Perahia, Cisco Systems

  13. Client Summary • Mandatory Behavior • Scan all available channels to find an 802.11n access point. • If that fails, have the ability to fall back to 802.11 a/g. • Desirable Behavior 1. Share a channel/cell/access points with legacy clients (Home). Eldad Perahia, Cisco Systems

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