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User Level Performance

User Level Performance. Date: 2013-01-07. Authors:. Abstract. This submission is: a supporting document for 11-13/0009r0 (InterDigital, etc.), indicating possible reasons of performance degradations on WLAN communication,. An 11ai STA:. Is mobile,

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User Level Performance

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  1. User Level Performance • Date:2013-01-07 Authors: Katsuo Yunoki, KDDI R&D Laboratories

  2. Abstract • This submission is: • a supporting document for 11-13/0009r0 (InterDigital, etc.), • indicating possible reasons of performance degradations on WLAN communication, Katsuo Yunoki, KDDI R&D Laboratories

  3. An 11ai STA: • Is mobile, • Is connected with cellular network usually, • Tries to associate with an 11ai AP automatically when it enters into that coverage area and • Executes transitions between cellular and WLAN without user’s operation. Cellular macro cell WLAN access point Isolated WLAN area Katsuo Yunoki, KDDI R&D Laboratories

  4. User Experienceat transition from cellular to WLAN Cellular NW (LTE, WiMAX, etc.) Cellular NW WLAN AP WLAN AP Congested!! Appropriate performance Good quality Higher throughput Congested, Not so fast Slow... GOOD!! Fast! Unsatisfied! Quick transition (FILS) Quick transition (FILS) Katsuo Yunoki, KDDI R&D Laboratories

  5. User Level Performance • User level performance is measured by “end-to-end performance” from STA to content server, while using WLAN communication. • Major performance indicators are: • Throughput • Round trip delay • Jitter • Packet loss • Possible reasons of performance degradations on each section are described on the following slides: Katsuo Yunoki, KDDI R&D Laboratories

  6. Network Diagram Exampleof public WLAN spot service Service Provider Facility STA AP APC Access Network Core Content servers GW AAA DHCP The Internet Internet GW (1)802.11 Link (2)Backhaul Link (3)Core network & Facilities (4)The Internet (5)Access net at another end & servers Katsuo Yunoki, KDDI R&D Laboratories

  7. Possible Reasons of Degradations(1) 802.11 Link • Low signal strength, • Low available PHY rate, • Congestion (many terminals), • Many associated terminals, • Hidden terminals, • Interference, • etc. Katsuo Yunoki, KDDI R&D Laboratories

  8. Possible Reasons of Degradations(2) Backhaul Link • Low PHY rate, • Congestion (best effort), • Sometimes, backhaul link is also wireless link, • LTE, WiMAX, WLAN, etc. for faster deployment • Larger delay than wired link • etc. Katsuo Yunoki, KDDI R&D Laboratories

  9. Possible Reasons of Degradations(3) Core Network & Center Facilities(4) The Internet • Not critical generally • Except in case of disaster or unusual situation, etc. • Sufficient bandwidth and processing power relative to 802.11 and Backhaul link Katsuo Yunoki, KDDI R&D Laboratories

  10. Possible Reasons of Degradations(5) Content Server Side • Insufficient processing power in content server or access GW router • Insufficient bandwidth in access network •  however, these are not issues generally. Katsuo Yunoki, KDDI R&D Laboratories

  11. Summary • Major reasons of user level performance degradations on WLAN communications locate on 802.11/backhaul link mainly. • Indications of 802.11/backhaul link performance from an AP will prevent unhappy transition from cellular to WLAN on an user terminal. Method for notification about cellular side performance degradations should be determined by 3GPP, etc. Katsuo Yunoki, KDDI R&D Laboratories

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