IEEE 802. 11 Wireless Local Area Networks Bruce Kraemer Chair 802. 11 V 03 Version 1. 0 EEE 802 IEEE 802 March 2011 workshop Page 1
Disclaimer… “At lectures, symposia, seminars, or educational courses, an individual presenting information on IEEE standards shall make it clear that his or her views should be considered the personal views of that individual rather than the formal position, explanation, or interpretation of the IEEE. ” IEEE-SA Standards Board Operation Manual (subclause 5. 9. 3) 2 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 2
Introduction and Agenda Presentation Context History Market Science Challenges Standard Baseline Extensions Further Information Amendment Project details References 3 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 3
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 4
IEEE 802 Organization IEEE Standards Association Standards Activities Board Sponsor IEEE 802 Local and Metropolitan Area Networks (LMSC) 802. 1 Higher Layer LAN Protocols 802. 3 CSMA/CD Ethernet 802. 5 Token Passing Ring Sponsor 802. 11 Wireless WLAN IEEE 802. 11: ~500 Participants Voting Members ~300 www. ieee 802. org/11 Version 1. 0 Sponsor 802. 15 Wireless Personal Area Networks Sponsor 802. 17 Resilient Packet Ring 802. 16 Broadband Wireless Broadband Access 802. 19 Co-existence TAG 802. 18 Radio Regulatory TAG IEEE 802 March 2011 workshop 802. 21 Media Independent Handoff 802. 20 Mobile Broadband Wireless Access 802. 22 Wireless Regional Area Networks EEE 802 Page 5
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 6
Activity History Feb 14, 1876: Bell files telephone patent June 1897: Marconi work- “Signaling through Space without Wires” 1970: ALOHAnet operational (Abramson, 9600 baud) 1976: Metcalf & Boggs: “Ethernet: Distributed Packet-Switching for Local Computer Networks” 1980: Project 802 formed (1 Mbps initially, revised to 20 Mbps 1982) (Feb 1980 , 125+ attendees) 1980: 1981: 1983: 1985: 1987: 1989: 1990: Ethernet Bluebook published (September , Digital. Intel, Xerox) FCC issues NOI for unlicensed spectrum First version of 802. 3 10 Base 5 spec completed FCC opens ISM Band- spread spectrum allowed First version of 802. 3 published (10 Mbps) Project 802. 4 L – Wireless Token Bus begins ISM frequency Bands 900 MHz, 2. 4 GHz and 5 GHz allowed IEEE 802 drops 802. 4 L starts 802. 11 project 802. 3 10 BASE-T (802. 3 i) released 1997: IEEE 802. 11 standard approved (2. 4 GHz – 1 Mbps) 1999: Apple IBook introduced with integrated 802. 11 (Air. Port) 7 Version 1. 0 16 -Mar-18 IEEE 802 March 2011 workshop EEE 802 Page 7
Activity History 1994: 1 st wireless radios - Inventory control 1997: IEEE 802. 11 standard approved (2. 4 GHz – 1 Mbps) 1998: UNII (Unlicensed National Information Infrastructure) Band - 5 GHz 1999: IEEE 802. 11 standard achieved ISO/IEC approval 1999: IEEE 802. 11 a (5 GHz – 54 Mbps) - approved IEEE 802. 11 b (2. 4 GHz- 11 Mbps)- approved 1999: Formation of WECA (now Wi-Fi Alliance) 2001: IEEE 802. 11 d Regulatory Domains - approved 2003: IEEE 802. 11 g (Higher rate 2. 4 GHz PHY) – approved IEEE 802. 11 i (Security) - approved IEEE 802. 11 h (Spectrum Mgmt) - approved IEEE 802. 11 f (interaccess point protocol) – approved 2005: IEEE 802. 11 e (MAC enhancements – Qo. S) – approved 8 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 8
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 9
Market Size and Trends – Market segment diversity continues to increase 1 million Units per day 10 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 10
Wi-Fi Hotspot Public Access – 280 K+ hot spots in 132 countries • Source: Ji. Wire (2009) – 1. 2 Billion connects • Source: In-Stat – 87% of US hotels offer Wi-Fi • Source: American Hotel & Lodging Assn EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 11
Expanding Uses - Airline Examples • Airline Example – American Airlines – Lufthansa – Virgin America – Google – Aircell Go. Go Inflight Internet • Smart Grid 12 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 12
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 13
Air is a Poor Substitute for Wire or Fiber • Large Scale fading – Attenuation (distance, obstructions) – Delay • Small scale fading – Multipath (Reflections) – Doppler – Frequency selective fading • Shared – Regulatory considerations – Interference 14 Version 1. 0 16 -Mar-18 IEEE 802 March 2011 workshop EEE 802 Page 14
Wireless Constraints • Shannon-Hartley C= channel capacity (bits/sec) BW= channel bandwidth (Hz) S = Signal watts (not d. B) N = Noise C = BW x log 2 1+S N Friis path loss Prx = Gtx. Grx c 2 (4 pd)2 fc 2 Version 1. 0 x 1 s Nf Ptx IEEE 802 March 2011 workshop EEE 802 Page 15
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 16
Basic Service Protocol - Listen Before Talk 1 Mbps example 1500 Byte User DATA PPDU 12192 ms DIFS (listen) 50 ms SIFS ACK PPDU 10 ms 304 ms EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 17
The 802 LAN Architecture OSI reference model 7 Presentation 5 Session 4 Transport 3 End station (Higher Layers) Application 6 End station Network MAC Bridge LLC RELAY 2 1 Link Physical MAC service user MAC service provider MAC MAC Phy Phy LAN LLC sublayer LAN MAC sublayer Physical layer Medium EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 18
802. 11 Project Scope (cont. ) EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 19
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 20
Technology Solutions PHY • Multiple Antennas • Forward Error coding • Modulation • Media access MAC • Quality of Service • Network measurement & Management • Security 21 Version 1. 0 EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 21
Summary of Major PHY Projects • • A - 20 MHz BW, 5 GHz B - 20 MHz BW, 2. 4 GHz G - 20 & 40 MHz BW, 2. 4 GHz N - 20 & 40 MHz BW, 2. 4 & 5 GHz • • AC – 20 to 160 MHz BW, 5 GHz AD – 2 GHz BW, 60 GHz AF – TV White Space Spectrum AH – Unlicensed spectrum below 1 Gz EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 22
PHY Project Sequence 100 Gbps 10 year yardstick 10 Gbps ad ac 1 Gbps 802. 3 milestones 100 Mbps n a 10 Mbps g b 802. 11 milestones Original 1 Mbps 100 Kbps 80 Version 1. 0 85 90 95 00 IEEE 802 March 2011 workshop 05 10 EEE 15 802 Page 23
IEEE 802. 11 – Key Technical Attributes Version 1. 0 ad 11 ac 11 n 11 a/ g b 11 11 24 11 ig 802. 11 Physical layer Data Rates – Mbps or • Specifications for the Physical and MAC 10000 Layers • Backward compatibility 9000 8000 with legacy 802. 11 7000 standard 6000 • Maximize spectral 5000 efficiency and 4000 3000 performance 2000 • Co-existence with 1000 other device sharing 0 the 2. 4 GHz and 5 Ghz frequency bands EEE 802 16 -Mar-18 IEEE 802 March 2011 workshop Page 24
Standard Revision Process 802. 11 -1999 Amendments • a • g • b • h • d • i • e • j 528 pages 802. 11 -2007 1220 pages Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 25
Standard Revision Process - underway 802. 11 -2007 1220 pages 802. 11 -revision D 7. 02 Version 1. 0 2608 pages Amendments • k (223 p) • n (560 p) D 11. 0 • p ( 45 p) D 11. 0 • r (116 p) • y ( 84 p) D 11. 0 • w (114 p) D 10. 0 • v (428 p) D 16. 0 IEEE 802 March 2011 workshop EEE 802 Page 26
Standard Revision Process - underway 802. 11 -revision D 7. 02 2608 pages Amendments • u (218 p) D 13. 0 • s (361 p) D 9. 0 802. 11 -2012 ~3000 pages Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 27
Standard Revision Process 802. 11 -2012 ~3000 pages 802. 11 -2016 Publication ~ 4000 Version 1. 0 Amendments • aa (126 p) D 3. 0 • ac (193 p) D 0. 1 • ad (406 p) D 1. 1 • ae ( 49 p) D 2. 0 • af ( 159 p) D 1. 0 • ah ( ? ? ? p) D 1. 0 • ai ( ? ? ? p) D 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 28
802. 11 Architecture Overview • Multiple Over the Air PHY options • One common MAC a b g n ac ad af ah 802. 11 MAC EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 29
Unlicensed Frequency Bands • • • <700 MHz 900 MHz 2. 4 GHz 5 Ghz 60 GHz EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 30
Spectrum for current PHY Amendments 6 GHz a 5 GHz n j 4 GHz y 3 GHz 802. 11 2 GHz Version 1. 0 b g n 1997 1999 2001 2003 2005 2007 2009 Calendar Time IEEE 802 March 2011 workshop EEE 802 Page 31
Spectrum – Forward Looking 100 GHz ad 10 GHz a n j y 1 GHz 802. 11 b g n xx . 1 GHz 1997 Version 1. 0 1999 2001 2003 2005 2007 IEEE 802 March 2011 workshop 2009 2011 2013 EEE 802 Page 32
Overview of Project Objectives PHY (. 11, a, b, g, j, n, ac, ad) • Change data rate options • Change spectrum • Project examples (. 11, a, b, g, j, n, y, ac, ad, af, S 1 G) MAC • Security (i, w) • Measurement and Management (k, v) • Flow control and Qo. S (e, aa, ae) • Time required to establish connection (p, r, FIA) • Spectral Efficiency • Regulatory behavior (d, h) Version 1. 0 IEEE topology (s, • Radio node connection 802 March 2011 workshopz) EEE 802 Page 33
Summary of Major MAC Projects • • • • Version 1. 0 D – Country information E - Qo. S F – Inter AP communication H – DFS, TPC Spectrum sharing with radars in 5 GHz J – Japan spectrum @ 4. 9 GHz K – Radio Measurement P – Vehicular Environments R – Fast roaming S – MESH Networking U – Inter-Networking V – Network Management W – Secure Management Frames Z – Tunneled Direct Link AA – Video Transport AE – Qo. S for Management Frames AI – Fast Initial Link Setup IEEE 802 March 2011 workshop EEE 802 Page 34
IEEE 802. 11 Standards Pipeline 802. 11 z TDLS 802. 11 s Mesh MAC 802. 11 u WIEN 802. 11 aa Video Transport 802. 11 ai FILS Smart Grid 802. 11 V Network Management 802. 11 ae Qo. S Mgmt Frm 802. 11 mb Revision 802. 11 ah PHY Version 1. 0 802. 11 Y Contention Based Protocol 802. 11 p WAVE e Qo. S h DFS & TPC i Security f Inter AP a 54 Mbps 5 GHz 802. 11 ad VHT 60 GHz TG without draft WG Letter Ballot IEEE 802 March 2011 workshop Sponsor Ballot g 54 Mbps 2. 4 GHz 802. 11 W Management Frame Security 802. 11 ac VHT 5 GHz Study groups 802. 11 k RRM 802. 11 -2007 802. 11 n High Throughput (>100 Mbps) 802. 11 af TVWS Discussion Topics 802. 11 r Fast Roam 802. 11 b (’ 99) 11 Mbps 2. 4 GHz Published Amendment EEE 802 Published Standard Page 35
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 36
Further Details Follow 802. 11 s Mesh MAC 802. 11 u WIEN 802. 11 aa Video Transport 802. 11 ai FILS Smart Grid 802. 11 V Network Management 802. 11 ae Qo. S Mgmt Frm 802. 11 mb Revision 802. 11 ah PHY Version 1. 0 802. 11 k RRM 802. 11 Y Contention Based Protocol 802. 11 p WAVE 802. 11 -2007 e Qo. S h DFS & TPC i Security f Inter AP a 54 Mbps 5 GHz 802. 11 ad VHT 60 GHz TG without draft WG Letter Ballot IEEE 802 March 2011 workshop Sponsor Ballot g 54 Mbps 2. 4 GHz 802. 11 W Management Frame Security 802. 11 ac VHT 5 GHz Study groups 802. 11 r Fast Roam 802. 11 n High Throughput (>100 Mbps) 802. 11 af TVWS Discussion Topics 802. 11 z TDLS 802. 11 b (’ 99) 11 Mbps 2. 4 GHz Published Amendment EEE 802 Published Standard Page 37
802. 11 n - High Throughput Overall project goals • Much higher data rates – 20 & 40 MHz channelization – 1 to 4 spatial streams • 1 stream for Client (Mandatory) • 2 stream for Access Point (Mandatory) – ½ Guard Interval – 56 tones (in 20 MHz) – 5/6 coding – Green Field preamble – Block aggregation – Maximum PHY throughput of 600 Mbps • Better Range – Beam Steering • Status: Published 2009 Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 38
TGn Throughput EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 39
802. 11 n - 20 MHz Channel Mask • New 20 MHz spectral mask • Same as IEEE 802. 11 a Mask • Modified signal floor at 30 MHz – From -40 d. Br to -45 d. Br Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 40
802. 11 P Wireless Access in Vehicular Environments (WAVE) Defines enhancements to support data exchange between high-speed vehicles and between these vehicles and the roadside infrastructure in the licensed ITS band of 5. 9 GHz. • Applications planned within the ITS domain (ITS services), including: – – – – collision avoidance traveller information toll collection commercial vehicle operations transit operations traffic management connecting the vehicle to the Internet. • Status: Published 2010 EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 41
802. 11 s MESH • An amendment to create a Wireless Distribution System with automatic topology learning and dynamic wireless path configuration. – – Target number of packet forwarding nodes: ~32 Support unicast and broadcast/multicast traffic Use 802. 11 i security or an extension thereof Extensible routing to allow for alternative forwarding path selection metrics and/or protocols – Use the 802. 11 four-address frame format or an extension – Interface with higher layers and connect with other networks using higher layer protocols • Status: Produced draft 4. 0 – preparing to go to Sponsor Ballot – Publication expected fall 2011 Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 42
Classic 802. 11 Wireless LAN Wired Infrastructure AP AP AP STA STA = radio link STA AP BSS = Basic Service Set STA STA ESS = Extended Service Set ≈ SSID Wireless Paradox: WLAN Access Points are Typically Wired Version 1. 0 EEE 802 IEEE 802 March 2011 workshop Page 43
Unwire the WLAN with Mesh Wired Infrastructure Mesh AP Mesh Point Mesh AP STA = mesh radio link Version 1. 0 STA STA STA ESS = Extended Service Set ≈ SSID EEE 802 IEEE 802 March 2011 workshop Page 44
EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 45
Tgu – Wireless Interworking Background • As IEEE 802. 11 hotspot deployment has become more widespread throughout the world, several problem areas have emerged with the way in which the hotspot behaves regarding its connection to external networks (e. g. the internet, cellular networks) which could be solved by standardization. • As the diversity of hotspots have proliferated, users have started to become frustrated with the non uniformity of interworking systems (e. g. poor service definition, disparate registration procedures, non-ubiquitous roaming). • Within the IEEE 802. 11 community it was felt that an amendment to the IEEE 802. 11 standard would be in order to address these problem areas. Generically these issues have been referred to as interworking, which refers to the functionality and interface between an IEEE 802. 11 access EEE network and any external network. 802 Version 1. 0 IEEE 802 March 2011 workshop Page 46
Tgu – Wireless Interworking Objectives • The primary objective of IEEE 802. 11 u, is to create an amendment to address interworking issues between an IEEE 802. 11 access network and any external network to which it is connected. • Interworking, is actually a collection of different functionalities: – – – Online Enrolment Network Selection Security Authorization from Subscriber Network Media Independent Handover Support • Status: Last Draft balloted was D 13. 0 – Published 2011 EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 47
802. 11 V Network Management • Explosive growth of 802. 11 wireless LANs emphasized the need to • Maintain network quality and security • Manage the RF environment – largely driven by interference from neighbouring wireless networks • Secure the network to maintain privacy and prevent unauthorized use. • Optimize the Network – improve the ability to shape the network Status: Last Draft balloted was D 16. 0 – Published Feb 2011 Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 48
TGv Content – Increased Station Power Saving • • • Traffic Filtering Service • Enables the AP to filter traffic for the station, and deliver only frames of a specified type. WNM-Sleep Mode • Provides an additional, extended power save mode. • When used with the Traffic Filtering Service, can provide significant station power savings, and provide a “Wake on WLAN” service. Flexible Broadcast/Multicast service • Enables multicast frames to be sent at longer delivery intervals and higher data rates, improving performance of multicast applications, and reducing station “awake time” Proxy ARP • Enables stations to remain in power save mode longer TIM Broadcast – Enables stations to check for queued traffic without receiving a full Beacon frame. EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 49
Example TGv Based Applications • “Wake on WLAN” Service– Stations sleep and are “awakened” when specific frames are received – Example application: User leaves corporate desktop in “sleep mode”, goes home, uses VPN from home to corporate LAN, wakes up and uses desktop remotely – Reduces power consumption of end devices, even stationary ones • Improved client power saving • Proxy ARP, TIM Broadcast, FBMS, Sleep Mode, Traffic Filtering • “Wireless Speakers” – Use Location services timing measurements to support audio synchronization • Improved Multicast Performance • Network Diagnostic Analysis/Troubleshooting • Co-located Interference Reporting, Diagnostic Reporting, Event Reporting, Multicast Diagnostics Reporting Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 50
802. 11 w – Protected Management Frames • One of the frame types defined in 802. 11 is “Action” sub-type “Management” • Management frames were previously less well protected than data frames. • The objective of this was to improve the security by providing data confidentiality of action management frames, deauthentication and disassociation frames • This standard protects networks from attack by malicious systems that forge disassociation requests that appear to be sent by valid equipment • Status: Last Draft balloted was D 10. 0 – Published 2009 Version 1. 0 IEEE 802 March 2011 workshop EEE 802 Page 51
802. 11 z Tunneled Direct Link • The purposes of this amendment are to create a new DLS mechanism which: a) Does not require access point upgrades (i. e. supports DLS operation with the non-DLS capable access points), b) Which supports power save mode (when associated with either DLS or non-DLS capable access points), and c) Continues to allow operation of DLS in the presence of existing DLS capable access points • Status: Last Draft balloted was D 13. 0 – Published 2010 EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 52
P 802. 11 z example • • Access Point maintains control over network connection air times However, device pairs can optimize their conversation and use modes not supported by the access point EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 53
802. 11 AA Video Transport Stream • Provides a set of enhancements to 802. 11 MAC to significantly improve video streaming performance while maintaining data and voice performance by improving Multicast/Broadcast video streams for link reliability with low delay and jitter. • Enhancements to the 802. 11 MAC for robust video streaming offer: – Interworking with relevant 802. 1 mechanisms including, but not limited to, 802. 1 Qat, 802. 1 Qav and 802. 1 AS – Graceful degradation of video streams when there is insufficient channel capacity. – Increasing robustness in overlapping BSS environments, without the requirement for a centralised management entity. • Modifying EDCA timing and parameter selection for video transport • Status: Just completed WG balloting of draft 3. 0 – preparing to go to EEE Sponsor Ballot 802 Version 1. 0 IEEE 802 March 2011 workshop Page 54
802. 11 AC Very High Throughput <6 GHz • Goal: A multi-user BSS peak aggregated throughput of at least 1 Gbps as measured at the MAC data service access point (SAP) • Robust and flexible bandwidth management: native support for simultaneous multiple bandwidth operation (within a given frequency band) • Add optional outdoor compatible delay spread resistance • Below 6 GHz carrier frequency operation excluding 2. 4 GHz operation and ensuring backward compatibility with legacy IEEE 802. 11 a/n devices in the 5 GHz unlicensed band. • Status: 0. 1 draft out for review – planning to begin balloting EEE on D 1. 0 in March 2011 802 Version 1. 0 IEEE 802 March 2011 workshop Page 55
802. 11 AD Very High Throughput • 60 GHz PHY • 2 GHz channel bandwidth, 4 Gbps data rates • Market drivers for Very High Throughput wireless LAN, include: – Never ending quest for higher performance computing drives higher processing power. – Media appliances are moving to HD content, driving 10 X storage capacity and bandwidth requirements. • Mainstream Wired LAN products have shifted to Gigabit per second speeds. The trend for a purely wireless campus drives the need for wired equivalent multi-Gigabit per second wireless solutions. Aggregate capacity increase using reduced cell sizes. • Status: Completed preparation of draft 1. 0 – balloted in WG October 2010. Preparing comment resolutions for next draft revision and ballot. EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 56
802. 11 ae Qo. S for Management Frames • This project will consider the classification and prioritization of management frames • All IEEE 802. 11 MAC management frames are transmitted at the highest priority. • Previous amendments ‘k’, ‘y’, ‘w’, ‘v’, and ‘u’ have introduced features that rely on management frames, which are essential for network operation. • In some cases, the management traffic will contend with network data traffic and reduce the performance of certain WLAN applications. • Providing a mechanism to prioritize management frames will enable improved performance of IEEE 802. 11 networks • This project will consider management frames that are used in both preand post- association. • Management frames of subtype Action will be considered. Other management frame types may be considered. • Status: Just completed ballot on Version 1. 0 2 nd draft. IEEE 802 March 2011 workshop EEE 802 Page 57
802. 11 af - Operation in the TV White Spaces • This project will make the necessary MAC and PHY changes to enable 802. 11 products to take advantage of this additional spectrum available due to the global transition to Digital TV (DTV) and lightly used sub. Gigahertz RF spectrum now becoming available, much of it for unlicensed, license exempt and/or lightly licensed use. • Example, On November 4, 2008, the United States FCC approved Report & Order 08 -260, allowing unlicensed use of TV band spectrum, in accordance with Part 15. Subpart H of FCC rules. Ofcom (UK) is in the process of making this Digital Dividend band available, and the EU has conducted a consultation on the band. Other regulatory domains are expected to follow. • Status: Produced draft 1. 0 – just completed first ballot in February 2011 EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 58
TGah – Sub 1 GHz • Project proposes to use spectrum below 1 GHz. • Lower frequency will increase range • Channel bandwidths have typically been 20 MHz or more, lower channel bandwidth will be required. • Status: New Task group November 2011– working on Use Cases and will begin to develop first draft EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 59
TG ai (FILS) • Fast Initial Link Setup goal is to reduce initial association time to allow fast connection and data transfer in situations where users are very dense and highly mobile. Goal definition: • Build a secure, fast initial authentication that • a) is suitable for users experiencing a small dwell time in a cell (due to high mobility or small cell sizes users) • b) scales for large number of simultaneously occurring initial authentications • Status: New Task Group January 2011– describing Use Cases – will begin to develop first draft EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 60
Future Projects • • Security Low power consumption Higher speed Longer range Spectral efficiency Qo. S Spectrum Sharing/ Cognitive Radio/ SDR Beamforming/ Smart Antennas EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 61
802. 11 References • http: //grouper. ieee. org/groups/802/11 EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 62
Publication Examples • • IEEE Wireless Communications IEEE Network IEEE Communications Magazine IEEE Transactions on Wireless Communications IEEE Spectrum Proceedings of the IEEE Transactions on Mobile Computing EEE 802 Version 1. 0 IEEE 802 March 2011 workshop Page 63
Recently Published Papers re 802. 11 • • • • Selfishness in Mesh Networks MAC Layer Misbehavior in Wireless Networks: Challenges and Solutions Designing Vo. IP Session Management over Interworked WLAN-3 G Networks The need for Access Point Power Saving in Solar Powered WLAN MESH Networks Interworking of WLAN-UMTS Networks A Scalable Monitoring System for 802. 11 Wireless Networks Toward Dependable Networking: Secure Location and Privacy at the Link Layer Handover Management in Integrated WLAN and Mobile Wi. MAX Networks Minimum Interference Channel Assignment in Multiradio Mesh Networks An Equal-Spacing-Based Design for Qo. S Guarantee in 802. 11 e HCCA Wireless Networks New MAC Scheme Supporting Voice/Data Traffic in Wireless Ad Hoc Networks Improving Security of Real-Time Wireless Networks Through Packet Scheduling A Cross-Layer Approach for Per-Station Fairness in TCP over WLANs Revisiting the Hidden terminal Problem in a CSMA/CA Wireless Network Version 1. 0 EEE 802 IEEE 802 March 2011 workshop Page 64
Скачать презентацию IEEE 802 11 Wireless Local Area Networks Bruce
450856e25e6ea77fca5bb1eb6477a231.ppt