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Steps in Handoffs and Use Cases

Steps in Handoffs and Use Cases. Vivek Gupta Intel Corporation vivek.g.gupta@intel.com May 2004. Background…. IEEE 802.21…from PAR and 5 Criteria

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Steps in Handoffs and Use Cases

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  1. Steps in Handoffs and Use Cases Vivek Gupta Intel Corporation vivek.g.gupta@intel.com May 2004 Vivek Gupta, Intel Corp

  2. Background…. • IEEE 802.21…from PAR and 5 Criteria • Media Access Independent mechanisms to facilitate optimization of L3 handoffs (e.g. Mobile IP sessions) between homogeneous or heterogeneous media types • Optimize Detection and Selection of Network attachment points • Ensure compatibility with the 802 architectural model and security mechanisms • No new security algorithms or protocols Vivek Gupta, Intel Corp

  3. Background…Scope of 802.21 802.Y 802.X 802.X zG (WWAN) • Intra 802 Handoffs (802.x  802.x) • Covered by respective 802 working groups • These 802 WGs will also deliver fast intra 802 handoff solutions that address ~30 msec or less handoff latency • Through proactive pre-authentication, soft handoffs, and/or fast reconnections between nodes (TGr, TGi, etc. for 802.11) • Inter 802 Handoffs (802.x 802.y) and extension to more general case of inter network handoff across cellular systems (802 zG) • Within scope of 802.21 • Intra 802 Handoffs across Administrative domains also within scope • Handoffs across 802.11a, 802.11b, 802.11g, 802.11n in scope? Vivek Gupta, Intel Corp

  4. Customers of 802.21 • Layer 3 and above applications… • Mobile IP for data transfers • Voice based applications • Network Selection Service • Select best radio • Others? Vivek Gupta, Intel Corp

  5. Steps in Handoff Process • Scenario • Multi radio mobile handset roaming in heterogeneous wireless network environment…. • Steps in Handover • Detect Changes in Link Availability • L2 Connection and Network Provider Selection • Link Selection and Configuration • Connection Handover Vivek Gupta, Intel Corp

  6. Steps in Handoff Process • Detect Changes in Link Availability • Availability of New Links • Through Native radios • Media Sense and Link Quality Estimation • Through non-Native radios • E.g.Using 802.11 radio, find out about all other radios in vicinity • Site Report for all radios (Global Network Neighborhood) • GPS assisted • Degradation and Loss of Existing links • Link Quality estimation and comparison • Signal Strength, Signal to Noise Ratio, Bit Error Rate => Link layer Triggers to notify higher layers Vivek Gupta, Intel Corp

  7. Steps in Handoff Process • L2 Connection and Network Provider Selection • Establish L2 connection with Available Links • Need Radio specific MAC level parameters • SSID, BSSID, Channel, etc. • Network Provider Selection • Based on preferred operator and available services • Provisioning utilities like Microsoft WPS may do most of the work here • There may be other cases where WPS may not be applicable, (Low power mode of operation) =>Extended Site Report (Global Network Neighborhood) can help with Link discovery and selection • Link layer parameters for existing radios (no probes, beacons, scans, etc.) • Service provider information Vivek Gupta, Intel Corp

  8. Steps in Handoff Process • Link Selection and Configuration • Link selection • Input from user policies, available links and services, etc. • Mostly an OS function • Link Configuration • IP connectivity Vivek Gupta, Intel Corp

  9. Steps in Handoff Process • Connection Handover • Decision to switch Connections or Maintain simultaneous connections etc. • Make before Break • Break before Make • Context Transfer • Application specific Vivek Gupta, Intel Corp

  10. Use Case #1 For other Wired  Wireless transitions, for time/latency critical applications user may want to use wireless even when device is NOT mobile. E.g. VoIP Phone Vivek Gupta, Intel Corp

  11. Use Case #2 Mobile user using VoIP over WLAN in office walks out, gets into car, and drives out of town! Vivek Gupta, Intel Corp

  12. Use Case #3 User roaming in an airport across domains and Service Providers. 802.21 facilitates handover to preferred Network Service Provider Vivek Gupta, Intel Corp

  13. 802.21 Work Items • Things to do in 802.21 • Use cases • Find compelling user scenarios to solve • Global Network Neighborhood • Discover about other radios through current radio • Neighbor graphs of all radios • Media Independent Triggers • Notifications about changes in link availability • Things NOT to do in 802.21 • Link Quality Comparison • Link Selection • Policy decision (Mostly an OS function….) • Connection handovers • Make before break etc. (Application specific…) Vivek Gupta, Intel Corp

  14. IEEE 802.21 Specification… • General organization of 802.21 specification • Type of Spec • More general and abstract in nature than other 802 specs • Customers of spec • Other 802 WGs and other Standard bodies • Normative vs Informative • How will compatibility with 802.21 enforced/measured • Mapping to other technology Vivek Gupta, Intel Corp

  15. Conclusion • Key areas of contribution for 802.21 • Media Independent Triggers • Global Network Neighborhood Vivek Gupta, Intel Corp

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