IEEE Standard : Broadband Wireless Access for New Opportunities.

Transcription

1 IEEE Standard : 1 Broadband Wireless Access for New Opportunities

2 IEEE Standard : 2 Broadband Wireless Access for New Opportunities Workshop on Nationwide Internet Access & Online Applications Dhaka, Bangladesh May 2004 Roger B. Marks (US) National Institute of Standards and Technology Boulder, Colorado, USA Chair, IEEE Working Group

3 Outline Wireless Metropolitan Area Networks Broadband Wireless Access IEEE Standards and IEEE 802 IEEE Working Group IEEE Air Interface Standard IEEE : Air Interface (MAC and GHz PHY) P802.16a: Amendment, 2-11 GHz (finished) Licensed License-Exempt P REVd: revision 3 WiMAX Forum coordinating interoperability testing Interoperability documentation in development P802.16e: Mobile Enhancement

4 Broadband Access to Stationary Sites The Last Mile Fast local connection to network 4 Business and residential customers seek it Data Voice Video distribution Real-time videoconferencing etc. Network operators seek it High-capacity cable/fiber to every user is expensive Construction costs do not follow Moore s Law

5 WirelessMAN: Wireless Metropolitan Area Network 5 Basestation SOHO customer Residential customer Multi-tenant customers Core network Source: Nokia Networks Basestation repeater SME customer

6 6

7 Centimeter-Wave Bands for Wireless MAN 7 International 3.5 GHz; 10.5 GHz; etc/ U.S.: MMDS & ITFS GHZ Korea 2.3 GHz Non-Line-of-Sight

8 8 License-Exempt Bands for Wireless MAN GHz (U-NII) 2.4 GHz License-Exempt: Wireless LANs GHz

9 Properties of IEEE Standard Broad bandwidth Up to 134 Mbit/s in 28 MHz channel (in GHz air interface) Supports multiple services simultaneously with full QoS Efficiently transport IPv4, IPv6, ATM, Ethernet, etc. Bandwidth on demand (frame by frame) MAC designed for efficient used of spectrum Comprehensive, modern, and extensible security Supports multiple frequency allocations from 2-66 GHz ODFM and OFDMA for non-line-of-sight applications TDD and FDD Link adaptation: Adaptive modulation and coding Subscriber by subscriber, burst by burst, uplink and downlink Point-to-multipoint topology, with mesh extensions Support for adaptive antennas and space-time coding Extensions to mobility are coming next. Is this 4G? 9

10 IEEE History 10 Initial Development: Meet every two months: Session #1: July Session #31/May 2004: Shenzhen, China Future Sessions Session #32/Jul 2004: Portland, Oregon, USA Session #33/Sep 2004: Seoul, Korea Session #34/Nov 2004: San Antonia, Texas, USA

11 The World Wants Access 11 All over the world: Users want access to networks Network operators want access to customers Broadband Wireless Access flourishes where: Many users are dissatisfied with their access Network operators need to reach customers

12 The World Wants Standards 12 Standards are at the forefront of world trade World Trade Organization rules accelerating process e.g. Chinese-language MediaView magazine is instituting a monthly column on standards In all fields of telecommunications, the world wants standards. Broadband Wireless Access is not isolated from this trend.

13 The World Wants WirelessMAN Standards Have had attendees from Australia, Belgium, Brazil, Canada, China, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Korea (South), Netherlands, Norway, Pakistan, Russia, Singapore, Spain, Sweden, Taiwan, UK, USA Coordinated European efforts in ETSI Working with ITU-R, ITU-T Discussions with Korean TTA

14 IEEE and ETSI 14 Over 50 liaison letters between and ETSI (European Telecom Standards Institute) ETSI HIPERACCESS Above 11 GHz ETSI began first, but IEEE finished first Harmonization efforts, but no success ETSI HIPERMAN Below 11 GHz IEEE began first Healthy cooperation Harmonized with a OFDM

15 BWA/ Interest within China IEEE a Broadband Wireless Access (BWA) Standard Development and Internet Application : conference sponsored by BUPT and MII on 24 August 2001 in Beijing on the specific topic of whether to use a as the Chinese national standard for fixed broadband wireless access at 3.5 GHz (Prof. Liu Yuan An, Chair) 15

16 and ITU 16 ITU-T: SG15 SG9 ITU-R: WP 9B

17 WiMAX Forum 17 WiMAX: Worldwide Interoperability for Microwave Access Mission: To promote deployment of BWA by using a global standard and certifying interoperability of products and technologies. Principles: Support IEEE standard Propose and promote access profiles for IEEE standard Certify interoperability levels both in network and the cell Achieve global acceptance Promote use of broadband wireless access overall Developing & submitting baseline test specs Over 100 member companies

18 Start of Major Publicity 18 "At the Wireless Communications Assoc. conference in San Jose... Sriram Viswanathan, director of Intel Capital's Broadband and Wireless Networking Investments group, declared during his keynote that ' [Wi-Fi] is the first key disruption is the next.'" "IEEE spec could disrupt wireless landscape," Electronic Engineering Times, 30 January 2003

19 IEEE 802 LAN/MAN Standards Committee 19 Wired: (Ethernet) (Resilient Packet Ring) Wireless: : Wireless LAN Local Area Networks : Wireless PAN Personal Area Networks {inc. Bluetooth} : WirelessMAN TM Metropolitan Area Networks : Vehicular Mobility (new in March 2003) : Handover (new in May 2004)

20 Why IEEE 802? 20 Telecom Standardization National Political Datacom Standardization Global Open Industry-Driven 802 and IETF set the standards

21 Who are the Members? 21 Telecom Standardization Bodies Governmental Representatives Companies IEEE engineers

22 IEEE 802 Process 22 Call for Contributions Specific topics for discussion at next meeting Receive and post written contributions Discuss and debate at meeting Create draft by 75% vote Working Group Ballot IEEE "Sponsor Ballot" Ballot Responses: "Approve" (can include comments) "Disapprove": indicate what needs to be changed to bring about an "Approve" vote

23 Participation in IEEE Open process and open standards Anyone can participate in meetings Anyone can participate outside of meetings Subscribe to mailing lists and read list archives Post to mailing lists Examine documents Contribute and comment on documents Join the Sponsor Ballot Pool Vote and comment on draft standards Must join the IEEE Standards Association to vote Producers and Users must both be in ballot group

24 IEEE Air Interface Work 24 Complete Standards IEEE Std Publ: : Apr 2002 MAC GHz PHY c Profiles Publ: : Jan 2003 Active Projects P REVd Revision Complete: May 2004? P802.16e Mobile Amendment Start: Dec 2002 In WG Ballot a 2-11 GHz PHY Publ: : April 2003

25 Additional IEEE Work 25 Conformance IEEE Std /Conf GHz PICS Publ: : Aug 2003 IEEE Std /Conf GHz TSS&TP Publ: : 25 Feb 2004 Coexistence IEEE Std Publ: : Sep 2001 Revision: Publ: : Mar 2004 P802.16/Conf GHz RCT Approved: 13 May 2004 P802.16/Conf GHz PICS New in March 2004

26 IEEE Standard : 26 The WirelessMAN-SC Air Interface Published: 8 April 2002

27 Point-to-Multipoint 27 Wireless MAN: not a LAN Base Station (BS) connected to public networks BS serves Subscriber Stations (SSs) SS typically serves a building (business or residence) provide SS with first-mile access to public networks Compared to a Wireless LAN: Multimedia QoS, not only contention-based Many more users Much higher data rates Much longer distances

28 Scope of 802 Standards 28

29 MAC: Overview 29 Point-to-Multipoint Metropolitan Area Network Connection-oriented Supports difficult user environments High bandwidth, hundreds of users per channel Continuous and burst traffic Very efficient use of spectrum Protocol-Independent core (ATM, IP, Ethernet, ) Balances between stability of contentionless and efficiency of contention-based operation Flexible QoS offerings CBR, rt-vbr, nrt-vbr, BE, with granularity within classes Supports multiple PHYs

30 MAC PDU Transmission 30 MAC Message SDU 1 SDU 2 Fragmentation Packing MAC PDUs PDU 1 PDU 2 PDU 3 PDU 4 PDU 5 Concatenation Burst P FEC 1 FEC 2 FEC 3 Shortening MAC PDUs P Preamble FEC block

31 Multiple Access and Duplexing 31 On DL, SS addressed in TDM stream On UL, SS allotted a variable length TDMA slot Time-Division Duplex (TDD) DL & UL time-share the same RF channel Dynamic asymmetry SS does not transmit/receive simultaneously (low cost) Frequency-Division Duplex (FDD) Downlink & Uplink on separate RF channels Static asymmetry Half-duplex SSs supported SS does not transmit/receive simultaneously (low cost)

32 TDD Frame (10-66 GHz) 32 Frame duration: 1 ms Physical Slot (PS) = 4 symbols

33 Burst FDD Framing 33 DOWNLINK UPLINK frame Broadcast Half Duplex Terminal #1 Full Duplex Capable User Half Duplex Terminal #2 Allows scheduling flexibility

34 Adaptive PHY 34 (burst-by-burst adaptivity not shown)

35 Adaptive Burst Profiles 35 Burst profile Modulation and FEC Dynamically assigned according to link conditions Burst by burst, per subscriber station Trade-off capacity vs. robustness in real time Roughly doubled capacity for the same cell area Burst profile for downlink broadcast channel is well-known and robust Other burst profiles can be configured on the fly SS capabilities recognized at registration

36 TDD Downlink Subframe 36 DIUC: Downlink Interval Usage Code

37 Burst FDD Framing 37 DOWNLINK UPLINK frame Broadcast Half Duplex Terminal #1 Full Duplex Capable User Half Duplex Terminal #2 Allows scheduling flexibility

38 FDD Downlink Subframe 38 TDMA portion: transmits data to some half-duplex SSs (the ones scheduled to transmit earlier in the frame than they receive) Need preamble to re-sync (carrier phase)

39 Typical Uplink Subframe (TDD or FDD) 39

40 Interoperability Testing for 40 WirelessMAN-SC (10-66 GHz) IEEE P802.16c (Detailed System Profiles) Published 15 January 2003 specifies particular combinations of options used as basis of compliance testing MAC Profiles: ATM and Packet PHY Profiles: 25 & 28 MHz; TDD & FDD Test Protocols: IEEE Std /Conformance0X PICS (01) Test Suite Structure & Test Purposes (02) Radio Conformance Tests (03; almost done)

41 Amendment: 41 IEEE Standard a Medium Access Control Modifications and Additional Physical Layer Specifications for 2-11 GHz

42 802.16a PHY Alternatives: 42 Different Applications, Bandplans, and Regulatory Environments OFDM (WirelessMAN-OFDM Air Interface) 256-point FFT with TDMA (TDD/FDD) OFDMA (WirelessMAN-OFDMA Air Interface) 2048-point FFT with OFDMA (TDD/FDD) Single-Carrier (WirelessMAN-SCa Air Interface) TDMA (TDD/FDD) BPSK, QPSK, 4-QAM, 16-QAM, 64-QAM, 256-QAM Most vendors will use Frequency-Domain Equalization

43 Key a MAC Features 43 OFDM/OFDMA Support ARQ Dynamic Frequency Selection (DFS) license-exempt Adaptive Antenna System (AAS) support Mesh Mode Optional topology Subscriber-to-Subscriber communications Complex topology and messaging, but: addresses license-exempt interference scales well alternative approach to non-line-of-sight

44 Mesh-based WirelessMAN 44 Source: Nokia Networks

45 Current Work 45 Revision of IEEE Std Project P REVd Mobility: Project P802.16e Compliance documentation New (Handover)

46 IEEE Summary The IEEE WirelessMAN Air Interface, addresses worldwide needs 46 The IEEE Air Interface provides great opportunities for vendor differentiation, at both the base station and subscriber station, without compromising interoperability. Compliance & interoperability tests are coming. Mobility is the next major enhancement.

47 Free IEEE 802 Standards 47 Since May 2001, IEEE 802 standards have been available for free download. See: beginning six months after publication IEEE Std , a, c are free IEEE Std is free IEEE Std /Conformance 01 is free

48 IEEE Standard : Tutorial 48 IEEE Communications Magazine, June 2002 (available on web site)

49 Conclusion 49 IEEE WirelessMAN standards are: open in development and application addressed at worldwide markets engineered as optimized technical solutions significantly complete With test spec documents in development being enhanced for expanded opportunities

50 IEEE Resources 50 IEEE Working Group on Broadband Wireless Access info, documents, tutorials, lists, etc: