What is WiMAX

WiMAX's full name is microwave access to global interoperability (worldwide interoperability for microwave access), combining this technology with the need for authorized or unauthorized microwave equipment, the lower cost, will expand the broadband wireless market, Improve the awareness of business and service providers. WiMAX is the IEEE802.16 standard, or wide band wireless access (broadband Wireless ACCESS,BWA standard). It is a wireless metropolitan area network (WMAN) technology, which is a new air interface standard for microwave and millimeter wave bands. It is used to connect the 802.11A wireless access hotspot to the Internet, but also can link the company and the family environment to the wired backbone line. It can be used as cable and DSL wireless extension technology, so as to achieve wireless broadband access.

WiMAX overview

WiMAX technology based on the 802.16 standard has been controversial since it was originally initiated by some manufacturers, such as Intel and Oviton. But with Motorola, Lucent, Cisco, Nortel Network and Fujitsu and other international giant companies, as well as Huawei, ZTE and other domestic network communications giant Enterprises to join, WiMAX's development prospects appear bright. The technology is based on the IEEE 802.16 series of broadband wireless standards. As in the year to enhance the 802.11 utilization of the active Wi-Fi Alliance, WiMAX also set up a forum, will enhance the public awareness of broadband potential, and urged suppliers to solve equipment compatibility issues, to accelerate the use of WiMAX technology, so WiMAX technology into the industry to become the use of IEEE Standard for 802.16 series broadband wireless devices.

With the development of mobile communication technology and broadband technology, WiMAX has become one of the hot issues for telecom operators and equipment manufacturers around the world. With the development of technology, more and more multimedia applications are entering into people's life, and the service provided by operators also changes. However, from the current network practice, a large number of multimedia applications to the existing mobile network resources caused huge consumption, far more than the related income increase. Therefore, it is significant for operators to reduce the cost per bit in order to better meet the needs of users under the premise of guaranteeing service quality. WiMAX is one of the most promising applications. (Computer science)

The future of the network will have the following characteristics: IP, broadband, cost more economic, network more convenient management, and a variety of technologies through a unified core network of mutual integration, can achieve seamless switching between business. WiMAX is a metropolitan area Network wireless access technology developed under the trend of telecom network convergence. WiMAX core network using mobile IP architecture, with the full IP network seamless integration capabilities. The WiMAX core network can satisfy the QoS requirement of different service and application, utilize the End-to-end network resources effectively, the core network is scalable, scalable, flexible and robust, and can meet the requirements of telecom-level networking; advanced mobility, including paging, location management, Switching between different technologies and switching between different carrier networks, with security guaranteed and QoS guaranteed in full mobile mode.

WiMAX is a wireless method instead of wired to achieve the "last kilometer" access to the broadband access technology. WiMAX's advantage is mainly embodied in this technology integrates the WiFi wireless access technology mobility and flexibility, as well as xDSL, such as cable based on the traditional broadband access technology, the high bandwidth characteristics, its technical advantages can be summarized as follows: transmission distance is far and fast access speed, system capacity is large, providing a wide range of multimedia communications services; , in the security assurance, interoperability and application scope, WiMAX also has a big advantage. Allow them to bypass copper or cable facilities, and expand their access network with more flexible and inexpensive wireless connections. WiMAX is an IEEE 802.16 standard, NLOS (not visual range), point-to-point technology, specifically for broadband wireless access and backhaul development, data throughput can be as high as 70Mbps, transmission distance of up to 50 km.

WiMAX networking mode

Through the analysis of the characteristics of WiMAX technology, WiMAX can be seen in the application scene is very broad, the main application of WiMAX technology is based on IP data Integrated Services broadband wireless access, the specific mode of work a bit on the multicast broadband wireless access, point-to-point broadband wireless access, cellular network mode, etc. For different applications, can be flexible and rapid deployment.

WiMAX technology has diversity in its application mode

1. On-demand broadband: 802.16A wireless technology enables service providers to complete network deployments within a few days and to supply services at a rate comparable to that of a wired solution, which can save a lot of costs. It also supports instant configurable "on-demand" high-speed connections for temporary activities, such as exhibitions.

2, Cellular return: 802.16 technical stability of bandwidth so that it becomes point-to-point configuration in the cellular base station return flow transmission of the ideal choice.

3, Community broadband: Fill cable and DSL cover blank. The actual limitations make it impossible for cable and DSL technologies to reach many potential broadband users, a situation that will change with the advent of a standards-based system based on 802.16A.

4. Less developed areas: wireless Internet technology based on IEEE 802.16 standard is the natural choice for underdeveloped rural areas and remote areas with low population densities.

5, the best connection Wireless services: IEEE 802.16e based on 802.16A expansion, the introduction of the nomadic (nomadic) capabilities, so that users can roam away from home still able to maintain a full time connection.
Point to multi-point broadband wireless access

Point-to-Point applications can be adapted with fixed, nomadic, and portable modes. WiMAX will be the most competitive alternative where XDSL or cable access is difficult to cover. Compared with DSL and other wired access, WiMAX technology is less influenced by distance and community user density, and WiMAX can be considered as an alternative to some DSL or cable access modes; For some temporary gatherings, such as exhibitions and sports venues, WiMAX has the flexibility to deploy quickly, which is especially suitable for future applications in Olympic projects, and the WiMAX deployment cycle features a shorter and more flexible approach than DSL or cable access.

Point to point Wireless broadband access

Point-to-Point wireless broadband access is mainly used in point-to-point mode for wireless postback and relay services. Point-to-Point wireless broadband access not only extends the WiMAX network coverage greatly, but also can provide wireless relay transmission for operators ' 2G/3G network Base station and WLAN hotspot. At the same time can be used for enterprise network remote interconnection and access.

WiMAX adopts OFDM technology, it can effectively fight multipath interference, and the adaptive modulation technology can realize the tradeoff between coverage and transmission rate. In addition, the adaptive power control can be used to dynamically adjust the transmit power according to the channel condition. This allows WiMAX to have a greater coverage and a higher access rate. For example, when the channel condition is good, the modulation mode can be adjusted to 64QAM, and the coding efficiency of the channel is higher, the transmission rate is increased, the maximum transmission rate of WiMAX can reach 75mbit/s; when the channel transmission condition is bad, the base station cannot establish the connection based on 64QAM, can be switched to 16QAM or QPSK modulation, while using a lower coding efficiency of the channel coding, which can improve the reliability of transmission, increase the coverage range.

Cellular Networking Mode

The WiMAX base station can form a honeycomb network similar to the existing GSM/CDMA network. The system based on IEEE802.16E Standard can provide stable, high-quality mobile voice service and high bandwidth mobile data services. Using cellular backhaul, wireless links between WiMAX base stations can be used to extend network coverage when deploying a large area of wireless access network. With the low cost of WiMAX per bit, it provides economical and convenient mobile broadband wireless service for handheld end users.

Written at the end: WiMAX Outlook

Compared to 3G, WiMAX is an up-and-comer. It uses 802.16 technical standards, is a new long-distance broadband wireless network technology, not only suitable for densely populated cities, but also in rural or urban suburbs can be well used, the cost is also low. So won the Intel, Proxim and other manufacturers of the pro-mi. Optimistic about WiMAX market prospects, Motorola also intends to provide integrated action solutions, not only compatible with 3G, Wi-Fi and WiMAX technology, and plans to support the future of these technologies may release, the company believes that WiMAX may initially rise in the United States, As Intel pushed through Wi-Fi solutions, it was expected to expand to the Asia-Pacific and European regions.

WiMAX Broadband wireless access technology, with a high access rate, wide coverage and support mobility, and so on a series of advantages, for the broadband wireless access system construction and application provides a good platform. The market's demand for mobility is rising. People want to be able to connect to the Internet at any time, anywhere, for communication, entertainment, and access to all kinds of information. WiMAX Forum under the impetus of the IEEE802.16 based on the standard products will soon enter the market.

Future WiMAX applications will bring a new network life experience to the final Internet users. WiMAX Broadband wireless access mode, each family can enjoy more than 25MB of broadband application services. Everyone can enjoy the happiness of information anytime and anywhere. WiMAX, will bring a huge breakthrough in the field of broadband wireless communication. At the same time, with the development of technology and standards and mature, in the future of wireless communications industry, WiMAX also has a lot of room for development. WiMAX development also needs a certain amount of time, need the support of various organizations, enterprises and markets, we believe that the future WiMAX technology will lead the market and life.