March 200 5 doc.: IEEE 802.11-05/0109r3 Service Provider Requirements for 802.11n Detailed Authors: Name Date: 2005-03-16 Company Address Phone email Brian Ford BellSouth (404) 986-9631 [email protected] Charles Cook Qwest (303) 896-5652 [email protected] Bob R. Miller AT&T 725 West Peachtree Room 7A43
Atlanta, GA 30308 1801 California Street 26th Floor Denver, CO 80027 Florham Park, NJ 973-236-6920 [email protected] Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures , including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair < [email protected]> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at . Submission Slide 1 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Abstract This presentation expands and provides details on presentation 11-051644-01-000n regarding Service Provider concerns over weaknesses/gaps within 802.11 that have negative market impact. The presentations primary focus is 802.11n as it enables a true wireless triple play of voice, data and video delivery. If 802.11n does not address the issues listed, there will be a negative impact on Service
Providers supplying the network link in high throughput applications. Resolving the weaknesses should be considered a major component of achieving Broad Market Potential and a truly market-enabling standard. Not resolving the issues will lead to proprietary solutions being promoted into the market, the opposite goal of a standards effort. Submission Slide 2 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 List of Contributors/Supporters John Egan, Infineon, [email protected] Larry Green, [email protected] L. Ji, [email protected] W. T. Marshall, [email protected] Fanny Mlinarsky, [email protected] H. R. Worstell, [email protected] Submission Slide 3 Brian F ord, Be March 200
5 doc.: IEEE 802.11-05/0109r3 What do Service Providers need (in priority order) Highest possible consumer satisfaction if WLAN doesnt work faultlessly consumers blame Service Provider or set provider 1. QoS - primary requirement video and high throughput data sessions (possibly pedestrian-speed mobile) 1. Streaming, high data rate video delivery, error free, with WLAN bandwidth priority 2. Management capability of WLAN resources/bandwidth 3. Reach versus rate, surrender some rate to get best reach 1. Longer Range with high data rate to enable extended range applications Target reach/rates [email protected] Mbps and [email protected] Mbps 4. Mobility support 1. 2. 3. 4. Reduce Doppler Effect ex. support for WLAN sets in pedestrian speed sessions Handoff Mesh Tight integration with mobile services to support IMS/MMS 5. Validate Encryption meets Content Provider requirements 6. Testability of any functionality to ensure qualification and certification 802.11 action eliminates the need for proprietary solutions, boosts the market Submission Slide 4 Brian F ord, Be March 200
5 doc.: IEEE 802.11-05/0109r3 Background slides Following slides recap needs presented in 11-05-1644-01000n Summary of messages Service Providers will be impacted by the standards weaknesses Service Providers deploy standards-based systems, systems that require non-standard functions to meet needs are unacceptable High Throughput APs and Stations will drive broad market acceptance and use of WLAN, placing SPs in a position to face consumer complaints over issues unresolved in the standards, and so unresolved in 802.11n-based systems SPs have specific concerns as listed Submission Slide 5 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Example of Requested Evaluation Points Signal Distance & Drop - Interior Width = D2 Width = D2 Room 2 Distance = D2 Distance = D1 Distance = D1 Measuring device Distance = D2
Internal AP Internal AP Interior Wall Room 1 Room 2 Room 1 Interior AP Landscape Submission Up to 6 walls? Interior AP Overhead Slide 6 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Estimate Signal Drop Parameters for 2.4 & 5 GHz Estimated drops at 2.4 GHz, do we use these? ~9 dB drop Exterior Wall ~6 dB drop Floor ~3 dB drop interior (sheetrock) wall What is 5.8 GHz dB drop by wall/floor/exterior wall Small cell outdoor environment also requires further characterization
Submission Slide 7 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Is Multi-Dwelling Support Possible? Curb-side or pole mounted AP Few barriers (trees) in the way Similar to Outdoor simulation definition, yet different application Prefer to be able to transit through a house to far end - additional ~30m Service Radius to dwelling Point of Presence goals 30m/100 ft Tree Tree Curb side or pole mounted AP Single Family Unit 150m @ target 45 Mbps over MAC ~300m @ 25 Mbps over MAC 150m 500 ft Initiate further study to determine if 802.16 is valid option versus 802.11 for external applications
Submission 300m 1000 ft Slide 8 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Example of Requested Evaluation Points Signal Distance & Drop - Exterior Width = D2 Composition and dB impact? Room 1 Width = D2 Distance = D1 Distance = D1 Distance = D2 Distance = D2 External AP Measuring device External AP Exterior Wall Exterior AP Landscape Submission
Exterior AP Overhead Slide 9 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Mesh/Hand-off/Overlap If multiple APs in adjoining/overlapping areas Can one AP be a station of another (FTTCurb scenario, AP and STB/AP are typical scenarios) Repeater or another AP Can they be in a mesh configuration? BSS coverage shaping via channel/Tx power/direction assignment Data forwarding path Can there be hand-off between them What are considerations if Yes Errors, high error rate, even at fast handoff, is unacceptable Data rate change Security and how this is handled in a hand-off Presumes is high probability mobility session so need to address the small packet definition here as well or is in event of one AP failure and another taking over service Interference between APs on unassociated LANs in MDU environment with overlapping coverage areas Submission
Slide 10 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 What this all nets out to To meet Broadest Market Potential Need to meet Service Provider needs, as they Face the consumer in a high % of deployments Will drive up mass Station deployments through AP deployments Provide highest consumer satisfaction experience Plug the holes regarding mobile sessions, including hand-offs, QoS between APs and Mesh Submission Slide 11 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Details TG efforts and standards to be evaluated as to changes needed to meet Service Provider requirements Following slides cover issues with associated TG following the priority order established earlier, although management is across all aspects Submission Slide 12
Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 TG/Standards that Impact Service Providers .11i enhanced security .11v network management .11s Mesh Networking .11k radio resource measurement Service Provider Requirements .11n High Throughput .11r fast roaming .11w Security Management Frames .11e QOS MAC enhancements .11t performance testing Submission Slide 13 Brian F ord, Be
March 200 5 doc.: IEEE 802.11-05/0109r3 QoS Metrics Issue Set QoS requirements for application/session types TG Issue/Resolution/Recommendation 11n, 11e, 11t Delay, jitter, error rates by application 11n, 11e QoS for high traffic environments to ensure no artifacts on video, etc. Must be interference immune 11n, 11e QoS versus Handoff Must mandate no reduction in QoS below a defined level 11n, 11e, 11t QoS for small packet with forwarding rate and throughput 11n, 11e, 11k QoS/BW management for multi-AP environment where each one is on a separate LAN, unable to be co-managed
Submission Comment Slide 14 Example is Multi-Dwelling Unit (MDU) where each apartment dweller has an 802.11n WLAN. QoS for each apartment owners video streams, etc. is required. Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Video Transport Issues Issue QoS mandated for High Data Rate applications (video primarily) TG Issue/Resolution/Recommendation 11n, 11e, 11t Comment Enable overair guaranteed, not prioritized QoS to avoid artifacts in video session. Dynamic polling by AP based on real-time video traffic volume dynamics not a pre-determined static schedule 11n, 11v, 11t Submission Manage LAN traffic to prevent impact of non-video related packets on video packets
Slide 15 e=QoS enhancements, t=testing Current 11e HCCA QoS scheme only supports statically scheduled polling by AP, which is not well suited for (compressed) video streams whose instantaneous data rate may vary greatly at different times t=testing, v=network management Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Handle a 2-way Mobile Video Session Issue How to handle mobile 2-way video session TG Issue/Resolution/Recommendation 11n, 11t Determine packet types used 11n, 11t Determine Doppler Effect for weak areas 11n Determine how to handle and QoS 11n, 11t, 11r, 11s, 11k, 11v, 11e,
11w Handle fast retransmit of lost packets in streaming video. Special transmission profile for special application classes May need special adaptive link layer data transmission redundancy/recovery mechanism tailored for special application classes 11n, 11t, 11r, 11s, 11k, 11v, 11e, 11w Use of 2 APs with this application 2 Stations embedded in one device? Set application flags for packet type, not by device By making this application registration of packet type versus device, enables multifunction device definition with best WLAN performance 11n Submission Comment Slide 16 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Mobile Wireless LAN Station Support Issue
Support for small, random packets in weak signal areas while station is mobile (WLAN SIP sets) to eliminate Doppler Effect TG Issue/Resolution/Recommendation Comment 11n, 11t Enable small packet support in standard use small packet device flag to AP as describer in 11-05-1644-01-000n 11r, 802.21 Additional link layer triggers exposed for network layer mobility mechanisms such as Mobile IP 11n, 11t Handling jitter and errors Set threshold for acceptable performance Set application flags for packet type, not by device By making this application registration of packet type versus device, enables multifunction device definition with best WLAN performance 11n Submission Slide 17 Brian F ord, Be
March 200 5 doc.: IEEE 802.11-05/0109r3 Distance Requirement Issue Maximize in-home distance and then determine rate TG Issue/Resolution/Recommendation Comment 11n, 11t Define what are in--home disturbers on 1 floor and agree on these Suggest 6 walls between AP and furthest station at 33m. Microwave ovens, refrigerators, DECT/Wireless sets @ 2.4 and 5.8 GHz 11n, 11t Determine multi-floor coverage possibilities 1 above and 1 below, dB impact of floors and then walls Define target maximum outdoor coverage radius Requires balance of user expectation of performance, technical viability, and economics (e.g. wireless + FTTC bundled costs) 11n
Submission Slide 18 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Large Area Deployment Support Issue Maximize in-home distance and then determine rate TG Issue/Resolution/Recommendation Comment 11n, 11e, 11k, 11v Coordination function for Co-channel BSSs, what and how. Limited available spectrum may not be sufficient to create enough spatial separation to avoid interferences among nearby co-channel BSSs. Current TGs focus on intra-BSS operations. Additional services and access to services needed for coordination function. 11k, 11v Measurement based automatic configuration of radio (channel, power, etc) Submission
Slide 19 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 External AP reach into the home Issue Reach must be 150m @4 5 Mbps and 300m @25 Mbps above the MAC measured within the home after signal penetration of "typical outside wall" TG Issue/Resolution/Recommendation 11n Work to determine what is possible, reach is most important factor 11n Determine use of Beamforming versus MIMO in this context 11n Determine what is definition of outside wall and components of such Aluminum siding and foil faced insulation may be problematic 11n, 11e, 11t QoS to ensure confidence of service delivery Separate access and traffic mechanisms to provide load-independent application for
service, eliminate QoS traffic impacts by those wishing to enter system 11n, 11r, 11s, 11k, 11v, 11t, 11w Use of AP or repeater in the home to regenerate signal and provide coverage, enable hand-off from external to internal AP r=fast roaming (between AP and repeater), i=security, s=mesh, k=resource measurement, v=network management, t=testing, w=security of management frames 11n, 11r, 11i, 11s, 11k, 11v, 11t Interoperability with legacy Wi-Fi equipment Large deployment of Wi-Fi equipment. How to integrate or at least co-exist Submission Comment Slide 20 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Handoff (AP/AP/Repeater) Issue Handoff between APs or between AP and repeater with no or minimal impact on station (ex. VoIP station crossing coverage areas)
TG Issue/Resolution/Recommendation 11n, 11t, 11e, 11v, 11r, 11s, 11k, 11w Agree on maximum allowed errors, jitter rate, delay 11n Differentiate between repeater and second AP (Mesh) as to topology and methodology of handoff 11n, 11t, 11e, 11v, 11r, 11s, 11k Adjust appropriate definitions 11n, 11t, 11e, 11v, 11r, 11s, 11k, 11w Pre-handoff authorization enabled to shorten handoff interruption time Submission Comment Slide 21 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Repeaters
Issue Use of Repeaters in the home, including crossover repeaters between 2.4 and 5.8 GHz TG Issue/Resolution/Recommendation 11n Define repeater 11n Determine data link between repeater and main AP and management of repeater by main AP 11n Define radio spectrum use between repeater and main AP, and determine impact n throughput at repeater and main AP May want reduced rate or reach at repeater to enable maximum rate/reach at main AP 11n, 11t, 11e, 11v, 11r, 11s, 11k, 11w Frequency crossover management WLAN handover 11n, 11t, 11e, 11v, 11r, 11s, 11k, 11w Define methodology of handoff between repeater and main AP, between repeater and other repeater (2 scenarios on same main AP or other main AP), between repeater and other main AP Determine Maximum number of hops for QoS
Submission Comment Slide 22 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Handoff (Mobile/AP) Issue Handoff between AP and Mobile service with no or minimal impact on station (ex. Dual mode station crossing coverage areas while in a call or idle) TG Issue/Resolution/Recommendation 11r Agree on maximum allowed errors for call in progress 11r While on a Mobile call and shifting onto AP coverage, includes security, Mesh, fast handoff, identification, pre-handoff authorization 11r While on a WLAN call and shifting from AP to Mobile Carrier, includes security, Mesh, fast handoff, identification, pre-handoff authorization 11r Idle set on WLAN needs to send I am available message to
Mobile Carrier periodically 11r AP must notify Mobile Carrier it is operational and able to make/take handoffs Submission Comment Slide 23 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Encryption Issue Encryption to meet Content Provider (CP) concerns TG Issue/Resolution/Recommendation 11n Determine what needs are 11n, 11w Analyze needs versus existing standards 11n Liaise with CPs to determine agreement on means to reach satisfactory results
11n, 11w Incorporate changes Submission Comment 11w is seen as extending work of 11i 11w is seen as extending work of 11i Slide 24 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Testability Requirement Objective test methodology for performance verification is key to enabling: Performance optimization (if you cant measure it, you cant improve it) Verification of performance requirements Effective comparison of products from different vendors Design 11n devices for testability in cooperation with TGT Important to agree on measurement methodology for
Submission Rate vs. range (reach) Voice and video quality vs. range Throughput of STAs Forwarding rate of APs and repeaters as a function of packet size, data load and client load Performance of voice and data services as a function of call load, AV stream load, background data load and client load QoS performance and QoS impact on above measurements Security settings impact on above measurements Handoff time QoS vs. handoff Slide 25 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Wrap Up Service Provider needs go beyond 802.11n extending eventually to 4G framework 802.11n should be focal point as is enabling standard Requires liaison and inter-TG work to ensure complete resolution of issues 802.11n should lead this 802.11n should down select then add this work as mandatory for TGn completion of its task
Submission Slide 26 Brian F ord, Be March 200 5 doc.: IEEE 802.11-05/0109r3 Actions 1. WNG assesses SP requirements 1. Determine 802.11 validity by concern 1. Agree on prioritization and what is mandatory for TGn to do 2. Determine what may be out of scope for 802.11 2. Recommend future action 1. TGn focal points with mandatory action required to complete effort 2. Appoint TGn as oversight group to manage completion of work by other TGs 3. Other TG action items 4. Liaison/joint efforts between TGs or TGs and outside groups 5. Refer to 802.11 any that should be for a new SG 2. TGn assumes role of responsibility for resolving issues agreed upon before TGn work completed Submission Slide 27 Brian F ord, Be
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