Broadband Wireless Access: A Brief Introduction to IEEE and WiMAX

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1 Broadband Wireless Access: A Brief Introduction to IEEE and WiMAX Prof. Dave Michelson davem@ece.ubc.ca UBC Radio Science Lab 26 April Introduction The IEEE /WiMAX standard promises to revolutionize wireless delivery of broadband services: an alternative to DSL and cable modems backhaul for access points and base stations long-range connections for private networks With standards, development, and certification welladvanced, the next major challenge is deployment. Now is a good time for wireless professionals to become familiar with WiMAX wireless technology 26 April

2 Introduction - 2 What is IEEE /WiMAX? a wide area alternative to IEEE /WiFi? a threat to cellular telephony (voice and data)? a method for breaking wireline monopolies? a method for providing backhaul to IEEE /WiFi access points? a single standard or a family of standards? a universal solution for broadband wireless access? 26 April Introduction - 3 How is IEEE /WiMAX different from (or better than) other wide area wireless standards? use of OFDM with provision for OFDMA and MIMO? support for a wide range of channel bandwidths (and, as a result, performance levels)? implementation of differentiated QoS? support for multiple usage models? use of system profiles to manage design options? 26 April

3 Objective This presentation introduces IEEE /WiMAX by: 1. Briefly reviewing its history 2. Summarizing its key features (and the key players) 3. Reviewing alternative use cases and deployment scenarios 4. Suggesting sources of additional information 26 April A Brief History of IEEE /WiMAX In the mid-1990 s, various groups began to promote last-mile fixed wireless access solutions. Multiple goals: Provide the capacity and reliability of wireline but with the flexibility and ease of deployment of wireless Provide a versatile system for corporate or institutional backhaul/distribution networks Break the monopolies of incumbent carriers 26 April

4 A Brief History of IEEE /WiMAX - 2 Interest soon focused in two approaches. LMDS (in Canada, LMCS) operates in mm-wave spectrum under LoS conditions uses conventional QAM modulation with ATMderived upper layers to provide high speed service MMDS (and other nearby bands) operates near 2 GHz, usually under LoS conditions may use any of various PHY, MAC, and NET layers 26 April A Brief History of IEEE and WiMAX - 3 High costs, lack of standards and fear of vendor lock-in drove off potential LMDS customers. In 1999, IEEE was formed to address these issues by developing open standards for LMDS. In 2001, the IEEE standard for BWA systems operating in the GHz range was released! Since then, however, interest has shifted to a new version of the IEEE standard for BWA systems operating in the range 2-11 GHz 26 April

5 A Brief History of IEEE and WiMAX - 4 Early BWA concepts were based on early WLAN technology and had limited capability. In the mid-1990 s, AT&T developed a proprietary last-mile access solution (Project Angel) that: operated near 2 GHz under either LoS or NLoS conditions used OFDM and other advanced concepts delivered high capacity, throughput, and QoS. 26 April A Brief History of IEEE and WiMAX - 5 By the late 1990 s, many other manufacturers began to pursue development of similar products. In response, IEEE formed a subgroup to extend the LMDS standard to the range 2-11 GHz. Our work at AT&T led to the propagation and channel models adopted by IEEE IEEE a was published in IEEE a/b/c and various updates were incorporated into IEEE April

6 A Brief History of IEEE and WiMAX - 6 IEEE e seeks to provide the additional features required to serve mobility users. Use of Scalable OFDMA, MIMO, etc. permits 63 Mbps DL and 28 Mbps UL in a 10 MHz channel. Optimized handover ensures latency < 50 ms. Flexible key management ensures security. South Korea s WiBro is based upon IEEE e. IEEE e was ratified in December April A Brief History of IEEE and WiMAX - 7 IEEE s approach is being used by many other groups including IEEE , , 3GPP - LT For example, IEEE (Mobile Broadband Wireless Access) was established on 11 Dec Aim specify an air interface designed for IP-based services operating in bands below 3.5 GHz with peak data rates of over 1 Mbit/s. A draft IEEE specification was balloted and approved on 18 Jan April

7 A Brief History of IEEE and WiMAX - 8 In 2001, the WiMAX Forum was formed to address issues beyond standards development, e.g., marketing and promotion development of system profiles development of certification procedures government lobbying In January 2005, the WiMAX Forum selected Cetecom Spain as its official certification laboratory. 26 April A Brief History of IEEE and WiMAX - 9 Many pre-wimax and WiMAX networks have been trialed and deployed in recent months. Pre-WiMAX has several meanings: compliant but not yet certified compliance is possible after a firmware upgrade mostly compliant, but not completely 26 April

8 A Brief History of IEEE and WiMAX - 10 The WiMAX Value Chain IEEE Standards Working Group WiMAX forum Industry Advocacy Group Chip Vendors Equipment Vendors Certification Labs System Integrators/VARs Consultants Information Providers Carriers/Service Providers End Users 26 April Key Features of WiMAX Major goal of IEEE (2-11 GHz): provide a universal solution for broadband wireless access point-to-multipoint, LoS or NLoS ranges of several km; urban, suburban, rural Problem: Can one size really fit all? Different applications have different requirements and constraints for spectrum and performance! Solution: Allow choice of options within a consistent framework. Offer a limited set of standard profiles. 26 April

9 Key Features of WiMAX - 2 Operating Frequency: 2 11 GHz*** Allocations: Licenced and Unlicenced** Channel Bandwidth: MHz Modulation: Single carrier*, 256 OFDM, 2048 OFDMA BPSK*, QPSK, 16-QAM, 64-QAM, 256-QAM* Antenna system support: Diversity, MIMO, SDMA Duplexing: FDD, H-FDD, TDD** Data Rates: From T1 (1.5 MB/s) to over 70 Mb/s 26 April Key Features of WiMAX - 3 WiMAX supports flexible frequency allocation and use of system profiles 26 April

10 Key Features of WiMAX carriers, khz spacing 200 carriers, 90 khz spacing carriers, 6.7 khz spacing 4 BPSK Pilots 8 BPSK Pilots... BPSK, QPSK, 16QAM, 64QAM a (18 MHz) BPSK, QPSK, 16QAM, 64QAM (20 MHz) : 10 MHz 7.0 MHz 3.5 MHz : 1.5 MHz 26 April Key Features of WiMAX - 5 An estimate of the maximum data rate of a WiMAX system operating in the 5 GHz band using OFDM System parameters BW = 20 MHz SCM = 64-QAM (1 symbol = 6 bits) No. of data subcarriers = 192 Raw data rate = 100 Mb/s After accounting for coding/mac/tdd overhead, the effective data rate is closer to 70 Mb/s 26 April

11 Key Features of WiMAX - 6 The IEEE MAC layer supports OFDM and OFDMA ARQ (Automatic Repeat Request) Dynamic Frequency Selection Mesh Networking Advanced Antenna Systems Differentiated Quality of Service Enhanced Security 26 April Key Deployment Scenarios Links from carriers to major customers Backhaul for access points and cellular base stations Long-range connections for private networks Supervisory control and data acquisition An alternative to DSL and cable modems An alternative to cellular data services 26 April

12 4. Our Research Interest in Fixed Wireless As systems move to higher frequencies, are deployed in more challenging environments, or become more complex, models must be updated and extended Past work has shown that the fixed wireless channel can range be extremely harsh. Transmitted Signal 26 April Our Research Interest in Fixed Wireless - 2 Existing channel models do not completely capture the dynamics of fixed wireless channels 26 April

13 Our Research Interest in Fixed Wireless - 3 Fixed wireless channel dynamics is concerned with the measurement and simulation of the time-varying properties of the channel over the long and short-term. Issues include: physical-statistical description of the channel, effect of alternative antenna configurations, development of impairment mitigation strategies, development of more effective radio resource management schemes. 26 April Our Research Interest in Fixed Wireless - 3 Current Sponsors Graduate Students: Joy Zhang, Jin Ng, Howard Huang, Anthony Liou 26 April

14 5. Probing Further IEEE April Probing Further - 2 WiMAX Forum April

15 Probing Further - 3 Intel April Probing Further - 4 Other industry portals, e.g., Booksellers, e.g., WiMAX conferences Vendors (white papers, etc.) 26 April

16 Summary IEEE /WiMAX broadband wireless access supports: channel bandwidths between 1.5 and 20MHz data rates ranging from 1.5Mbps to over 70Mbps the available spectrum and channel widths in different countries or licensed to different providers advanced quality-of-service features that ensure high performance for data, voice and video system profiles that permit a certain degree of customization within the IEEE framework 26 April Summary - 2 The IEEE /WiMAX community has already achieved several significant milestones: the IEEE standard has been released and refined. the WiMAX forum is addressing the needs of industry for promotion, certification, etc. vendors have developed silicon and equipment. As rollout begins, operators will begin addressing issues that arise during deployment and operation. 26 April

17 Summary - 3 What will it take for WiMAX to be successful? Equipment must perform as advertised: Coverage, reliability, and interoperability Quality of service, throughput and capacity Deployment must be straightforward; design rules should reduce the need for network tuning WiMAX must return value (e.g., performance/cost) that is an order of magnitude higher than existing technology can. 26 April Next. Andrew Tsui (Bell Canada) will describe one of the largest pre-wimax rollouts to date Angela Choi (Industry Canada) will summarize spectrum allocation and regulatory issues After a break Ben Zarlingo (Agilent Technologies) will describe WiMAX test and measurement solutions Angela Ikemoto and Michael Fite (Agilent) will demonstrate measurement of actual WiMAX signals 26 April

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