IEEE 802.16: A Comprehensive Guide to WiMAX and Beyond

WiMAX, short for Worldwide Interoperability for Microwave Access, is a wireless broadband technology that operates on the IEEE 802.16 standard. WiMAX was designed to provide high-speed internet access to rural and underserved areas.

WiMAX uses a point-to-multipoint topology, where a central tower communicates with multiple subscriber stations. This design allows for efficient use of spectrum and scalability to support large numbers of users.

WiMAX operates on a variety of frequency bands, including 2.3, 2.5, and 3.5 GHz, and can reach speeds of up to 40 Mbps. This makes it suitable for applications such as video streaming and online gaming.

The IEEE 802.16 standard has undergone several revisions, with the latest being 802.16m, which provides even faster speeds and improved mobility support.

Expand your knowledge: Wireless Access Point

IEEE 802.16 supports quality of service and multicast, making it possible for triple-play service offerings.

Triple-play services are a key benefit of WiMAX, allowing for the integration of voice, video, and data services.

Expand your knowledge: Network Service Provider

WiMAX directly supports these technologies, unlike carrier Ethernet which is added on.

The combination of WiMAX and cable services was a major focus of the Sprint Nextel, Google, Intel, Comcast, Bright House, and Time Warner partnership in 2008.

This partnership aimed to provide media services and access to wireless networks for mobile virtual network operators.

The deal was seen as a way to leverage high bandwidth assets and increase backhaul and media services.

Intriguing read: Samsung Galaxy S II WiMAX

The IEEE 802.16 working group is responsible for defining the standards for wireless metropolitan area networks.

This group has defined amendments to support specific frequency bands, such as the 865 MHz to 867 MHz band in India.

The amendment for China supports the PHY that complies with the applicable Chinese regulations, including the frequency bands 314-316 MHz, 430-434 MHz, and 779-787 MHz.

Expand your knowledge: 5G NR Frequency Bands

The Working Group is responsible for defining alternate PHY and modifications to the MAC to support specific frequency bands.

This includes the 314-316 MHz, 430-434 MHz, and 779-787 MHz frequency bands, which are regulated by the Radio Management of the P.R. of China.

A physical (PHY) layer enabling the use of the 865 MHz to 867 MHz band in India is also defined by the Working Group.

The supported data rate for this PHY layer should be at least 40 kb/s, and the typical line-of-sight range should be on the order of 5 km using an omni directional antenna.

The Working Group includes any channel access and/or timing changes in the medium access control necessary to support this PHY layer.

On a similar theme: Access Network

Gateways are a crucial part of the WiMAX network, allowing users to access the internet and connect devices.

Several manufacturers offer WiMAX gateway devices, including Vecima Networks, Alvarion, Airspan, ZyXEL, Huawei, and Motorola.

These gateways can be either indoor or outdoor units, with indoor units typically being self-install stand-alone units that sit near a window with the best signal.

Explore further: WiMAX

Indoor gateways are convenient but may require the subscriber to be closer to the WiMAX base station due to radio losses.

Outdoor units are roughly the size of a laptop PC and require installation similar to a residential satellite dish.

A higher-gain directional outdoor unit can greatly increase range and throughput but limits the unit's mobility.

The Asia-Pacific region has surpassed the North American region in terms of 4G broadband wireless subscribers, with 1.7 million pre-WiMAX and WiMAX customers in Asia compared to 1.4 million in the US and Canada.

Suggestion: WiMAX MIMO

WiMAX refers to interoperable implementations of the IEEE 802.16 family of wireless-networks standards ratified by the WiMAX Forum. This ensures a level of interoperability with other certified products.

The original IEEE 802.16 standard, now called "Fixed WiMAX", was published in 2001. WiMAX adopted some of its technology from WiBro, a service marketed in Korea.

WiMAX is suitable for various applications, including providing portable mobile broadband connectivity across cities and countries through various devices. It also provides a wireless alternative to cable and digital subscriber line (DSL) for "last mile" broadband access.

WiMAX has the potential to provide data, telecommunications (VoIP) and IPTV services (triple play). It can also provide Internet connectivity as part of a business continuity plan.

A fresh viewpoint: Boingo Wireless

WiMAX refers to interoperable implementations of the IEEE 802.16 family of wireless-networks standards ratified by the WiMAX Forum.

WiMAX Forum certification allows vendors to sell fixed or mobile products as WiMAX certified, ensuring a level of interoperability with other certified products.

The original IEEE 802.16 standard was published in 2001 and is now called "Fixed WiMAX".

WiMAX adopted some of its technology from WiBro, a service marketed in Korea.

Mobile WiMAX is based on the 802.16e-2005 revision and is the basis for future revisions such as 802.16m-2011.

Here's an interesting read: Wifi 7 Certified

WiMAX is a versatile technology with a wide range of applications. It's suitable for providing portable mobile broadband connectivity across cities and countries through various devices.

WiMAX can provide a wireless alternative to cable and digital subscriber line (DSL) for "last mile" broadband access. This makes it a viable option for areas where traditional wired connections are not available or are too expensive to install.

One of the key features of WiMAX is its ability to support multiple services, including data, telecommunications (VoIP), and IPTV. This makes it an attractive option for businesses and individuals who need a single solution for all their communication needs.

WiMAX is also being used as part of a business continuity plan to provide internet connectivity in case of outages or disasters. This ensures that businesses can stay connected and operational even in the event of a disaster.

Here are some of the key applications of WiMAX:

As of October 2010, the WiMAX Forum claimed over 592 WiMAX networks deployed in over 148 countries, covering over 621 million people.

The WiMAX Forum cited coverage of over 823 million people by February 2011, with an estimated coverage of over 1 billion people by the end of the year.

South Korea launched a WiMAX network in the second quarter of 2006, and by the end of 2008, there were 350,000 WiMAX subscribers in Korea.

By early 2010, WiMAX seemed to be ramping quickly relative to other available technologies, though access in North America lagged.

The high-water mark for WiMAX technology was reached in August 2011, with over 20 million WiMAX subscribers worldwide.

Middle-mike backhaul to fiber networks involves aggregating sites using wireless technology and then presenting traffic onto fiber networks where convenient. This approach competes with microwave radio, E-line, and simple extension of the fiber network itself.

Operators are using wireless technology to bring together multiple sites, which is a cost-effective way to expand their network. This method allows for efficient use of resources.

WiMAX is one technology being used for middle-mile backhaul, and it's often compared to microwave radio.

Discover more: Cambium Networks Radio Default Ip

IP Network Integration is a crucial aspect of WiMAX deployment. WiMAX can be connected with an IP-based core network, which is typically chosen by operators that serve as Internet Service Providers (ISP).

The WiMAX Forum has proposed an architecture that defines how a WiMAX network can be integrated with an IP-based core network. This architecture is flexible and can be designed into various hardware configurations.

The proposed architecture defines a number of components, including the Subscriber Station/Mobile Station (SS/MS), Access Service Network (ASN), and Base station (BS). These components are connected through various reference points (R1 to R5 and R8).

Broaden your view: Open Base Station Architecture Initiative

Some of the key components of the architecture include the ASN Gateway (ASN-GW), Home Agent (HA), and Authentication, Authorization and Accounting Server (AAA). These components work together to provide seamless integration with other types of architectures, such as packet-switched Mobile Networks.

The architecture is designed to accommodate devices of varying scale and functionality, including remote/mobile stations and Base Stations of varying size – e.g. femto, pico, and mini BS as well as macros. This flexibility makes it easier for operators to deploy WiMAX networks in a variety of settings.

You might like: Multiple-channel Architecture

Spectrum allocation for WiMAX is not uniform globally, but the WiMAX Forum has published three licensed spectrum profiles: 2.3 GHz, 2.5 GHz, and 3.5 GHz.

In the US, the biggest segment available is around 2.5 GHz, primarily assigned to Sprint Nextel and Clearwire. Elsewhere, the most likely bands used will be the Forum-approved ones, with 2.3 GHz probably being most important in Asia.

The 2.5 GHz band is already assigned in the US, and the FCC auction for the 700 MHz analog TV band, which may become available, began in January 2008.

WiMAX profiles define channel size, TDD/FDD, and other necessary attributes for interoperating products. The fixed profiles have channel sizes of 3.5 MHz, 5 MHz, 7 MHz, and 10 MHz, while the mobile profiles are 5 MHz, 8.75 MHz, and 10 MHz.

Here are the WiMAX profile channel sizes:

WiMAX technology has been included in the IMT-2000 set of standards since October 2007, enabling spectrum owners to use WiMAX equipment in any country that recognizes the IMT-2000.

Spectrum allocation is a crucial aspect of WiMAX technology.

The WiMAX Forum published three licensed spectrum profiles: 2.3 GHz, 2.5 GHz, and 3.5 GHz, to drive standardization and decrease cost.

These profiles define channel size, TDD/FDD, and other necessary attributes for interoperating products.

In the US, the biggest segment available for WiMAX was around 2.5 GHz, primarily assigned to Sprint Nextel and Clearwire.

Analog TV bands (700 MHz) may become available after the complete digital television transition, but other uses have been suggested for that spectrum.

The Radio communication Sector of the International Telecommunication Union (ITU-R) has included WiMAX technology in the IMT-2000 set of standards since October 2007.

This enables spectrum owners to use WiMAX equipment in any country that recognizes the IMT-2000.

The Telecommunications Industry Association released three technical standards in 2011 that cover the air interface and core networking aspects of Wi-Max High-Rate Packet Data (HRPD) systems.

Interference can be a major issue in wireless communication systems. In fact, a field test conducted in 2007 by SUIRG showed interference at 12 km when using the same channels for both WiMAX systems and satellites in C-band.

WiMAX systems, which operate under the IEEE 802 standard, can be particularly susceptible to interference in metropolitan area networks. This is because they share the same channels as other wireless systems, increasing the risk of signal overlap and degradation.

For your interest: Wireless Medical Telemetry Service

The 2007 field test was conducted with support from the U.S. Navy, the Global VSAT Forum, and several member organizations. It's a good example of how interference can occur in real-world scenarios.

To illustrate the potential impact of interference, consider the following list of affected systems:

The results of the 2007 field test highlight the importance of careful channel allocation and management to minimize interference in wireless communication systems.

Conformance testing is a crucial aspect of ensuring that WiMAX implementations meet the required standards. TTCN-3 test specification language is used for specifying conformance tests.

The WiMAX test suite is being developed by a Specialist Task Force at ETSI, known as STF 252. This test suite will play a vital role in validating the compliance of WiMAX implementations.

WiMAX's scalable OFDMA technology supports channel bandwidths of between 1.25 MHz and 20 MHz, making it suitable for various deployment scenarios.

In the citywide deployment of WiMAX in Perth, Australia, customers at the cell-edge with an indoor CPE typically obtain speeds of around 1–4 Mbit/s.

Operating at the maximum range of 50 km increases bit error rate and results in a much lower bitrate, so it's essential to balance range and bitrate for optimal performance.

A minimum guaranteed throughput for each subscriber can be put in place using WiMAX's QoS, ensuring that performance doesn't deteriorate in the case of many active users in a single sector.

Most users will have a range of 4–8 Mbit/s services, and additional radio cards will be added to the base station to increase the number of users that may be served as required.

WiMAX's support for multiple-input multiple-output (MIMO) antennas provides good non-line-of-sight propagation (NLOS) characteristics, which is particularly useful in urban environments with many obstacles.

Silicon implementations played a crucial role in the development of WiMAX Subscriber Stations.

A number of specialized companies produced baseband ICs and integrated RFICs for WiMAX Subscriber Stations in the 2.3, 2.5 and 3.5 GHz bands. These companies include Beceem, Sequans, and PicoChip.

These companies were key in creating the necessary hardware for WiMAX Subscriber Stations to operate effectively.

The 2.3, 2.5 and 3.5 GHz bands were specifically chosen for their ability to provide reliable internet access over long distances.

Here are some of the companies involved in silicon implementations for WiMAX Subscriber Stations:

Conformance testing is a crucial step in ensuring that WiMAX implementations meet the required standards. It involves testing whether a product or system conforms to the specifications and requirements set by the industry.

The TTCN-3 test specification language is used for specifying conformance tests for WiMAX implementations. This language is being used by a Specialist Task Force at ETSI (STF 252) to develop the WiMAX test suite.

A well-designed conformance test suite can help identify and fix issues early on, reducing the risk of costly rework or even product recalls. It can also provide assurance to customers and stakeholders that the product meets the required standards.

The WiMAX test suite is being developed to cover various aspects of WiMAX implementations, ensuring that they meet the necessary requirements. This includes testing for conformance to the WiMAX specifications and protocols.

WiMAX and Wi-Fi are often confused due to their similarities in wireless connectivity and internet access. WiMAX is a long-range system covering many kilometres, using licensed or unlicensed spectrum to deliver connection to a network, usually the internet.

Wi-Fi, on the other hand, uses the 2.4 GHz and 5 GHz radio frequency bands to provide access to a local network. It's far more popular in end-user devices, with Wi-Fi running on the Media Access Control's CSMA/CA protocol, which is connectionless and contention-based.

WiMAX, however, runs a connection-oriented MAC. Both WiMAX and Wi-Fi define Peer-to-Peer (P2P) and wireless ad hoc networks, where an end-user communicates with users or servers on another Local Area Network (LAN) using its access point or base station.

WiMAX network operators typically provide a WiMAX Subscriber Unit that connects to the metropolitan WiMAX network and provides Wi-Fi connectivity within the home or business for computers and smartphones.

Curious to learn more? Check out: Network Access Server

WiMAX's main competition came from existing wireless systems such as UMTS, CDMA2000, existing Wi-Fi, mesh networking, and eventually 4G (LTE). WiMAX was a superior technology in terms of speed (roughly 25 Mbit/s) for a few years (2005-2009), but it was too late in getting established as a mobile solution.

The LTE standard was finalized in December 2008, and by 2009, most mobile operators began to realize that mobile connectivity was the future, and that LTE was going to become the new worldwide mobile connectivity standard.

A different take: Virgin Mobile USA

The IEEE 802.16m standard was the core technology for WiMAX 2, submitted to the ITU for IMT-Advanced standardization.

It provided four times faster data speed than the WiMAX Release 1, and WiMAX Release 2 offered backward compatibility with Release 1, allowing operators to migrate by upgrading channel cards or software.

WiMAX operators could upgrade to Release 2 by replacing channel cards or software, making the transition relatively smooth.

By the end of the 2010s, a significant number of operators had migrated to WiMAX Release 2.1, which broke compatibility with earlier WiMAX networks.

As of October 2010, the WiMAX Forum claimed over 592 WiMAX networks deployed in over 148 countries, covering over 621 million people.

By February 2011, the WiMAX Forum cited coverage of over 823 million people, and estimated coverage to over 1 billion people by the end of the year.

A different take: Cambium Networks

Several projects have been undertaken to develop and refine the standards for broadband wireless access systems.

The IEEE 802.16 standard was initially focused on fixed broadband wireless access (10–66 GHz) but was later superseded.

Other notable projects include the IEEE 802.16.2 standard, which provides a recommended practice for coexistence, and the IEEE 802.16a standard, which defines the physical layer and MAC for 2–10 GHz.

The IEEE 802.16c standard provides system profiles for 10–66 GHz, while the IEEE 802.16d standard is a maintenance and system profile for 2–11 GHz.

Recommended read: Black Sea Fiber-Optic Cable System

Here's a list of some of the key projects and their statuses:

These projects have contributed significantly to the development of broadband wireless access systems, enabling faster data transfer rates and improved connectivity.

By the end of 2008, there were 350,000 WiMAX subscribers in Korea. This is a significant milestone in the deployment of WiMAX technology.

South Korea launched a WiMAX network in the second quarter of 2006, making it one of the early adopters of this technology.

In 2008, Spain delivered full coverage of WiMAX service in two cities, Seville and Málaga, reaching 20,000 portable units.

The WiMAX Forum claimed that over 592 WiMAX networks were deployed in over 148 countries by October 2010, covering over 621 million people.

By February 2011, the WiMAX Forum estimated that the technology covered over 823 million people, with a projected reach of over 1 billion people by the end of the year.

Yota, the largest WiMAX network operator in the world in 4Q 2009, announced in May 2010 that it would move new network deployments to LTE.

The high-water mark for WiMAX subscriptions was reached in 2011, with over 20 million subscribers worldwide, according to the WiMAX Forum.

The IEEE 802.16m-2011 standard was the core technology for WiMAX 2, submitted to the ITU for IMT-Advanced standardization.

IEEE 802.16m systems can provide four times faster data speed than the WiMAX Release 1.

WiMAX Release 2 provided backward compatibility with Release 1, allowing operators to upgrade channel cards or software for a seamless transition.

The WiMAX 2 Collaboration Initiative was formed to facilitate this transition and help operators migrate to the new standard.

It was anticipated that using 4X2 MIMO in the urban microcell scenario would support both 120 Mbit/s downlink and 60 Mbit/s uplink per site simultaneously.

WiMAX Release 2 was expected to be available commercially in the 2011-2012 timeframe.

WiMAX Release 2.1 was released in the early 2010s, breaking compatibility with earlier WiMAX networks.

By the end of the 2010s, a significant number of operators had migrated to the new standard, which is compatible with TD-LTE.