submission doc.: ieee 11-13/0030r0 january 2013 katsuo yunoki, kddi r&d laboratoriesslide 1 user...
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Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 1
User Level Performance
Date: 2013-01-07
Name Affiliations Address Phone email Katsuo Yunoki KDDI R&D
Laboratories 3-10-10 Iidabashi, Chiyoda-ku, Tokyo, Japan
Authors:
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 2
Abstract
This submission is: a supporting document for 11-13/0009r0
(InterDigital, etc.), indicating possible reasons of performance
degradations on WLAN communication,
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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 andExecutes transitions between cellular and WLAN without user’s operation.
Cellularmacro cell
WLANaccess point
IsolatedWLAN area
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 4
User Experienceat transition from cellular to WLAN
Quick transition
(FILS)
Slow...
Fast!
Cellular NW WLAN AP
Quick transition
(FILS)
GOOD!!
Unsatisfied!
Cellular NW(LTE, WiMAX, etc.) WLAN AP
Good quality
Higherthroughput
Congested,Not so fast
Congested!! Appropriate performance
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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:ThroughputRound trip delayJitterPacket loss
Possible reasons of performance degradations on each section are described on the following slides:
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 6
Network Diagram Exampleof public WLAN spot service
STAAP
Content servers
Access Network
CoreGW
InternetGW
Service Provider Facility
APC
AAA
DHCP
The Internet
(1)802.11 Link
(2)Backhaul Link
(3)Core network & Facilities
(4)The Internet (5)Access net at another end & servers
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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.
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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.
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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.
Submission
doc.: IEEE 11-13/0030r0January 2013
Katsuo Yunoki, KDDI R&D LaboratoriesSlide 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.