Why does WiMAX always argue?

When you enter a room full of people and start talking about WiMAX-next-generation mobile broadband, it is likely to attract people's attention. However, the response may be very different. Some time ago, at the Fortune iMEME conference, Qualcomm's CEO Paul Jacob BS and the Chairman and Co-Founder of GCP of the investment institution Kamran elehian held a heated debate on WiMAX. As a bystander, I also want to talk about WiMAX.

Why are some people excited and worried about this new wireless broadband technology? WiMAX has caused so much debate because it is different from the traditional technical route. In the process of promoting the development of mobile communication systems to the third generation technology, 3GPP and PP2 have been both making great efforts and have achieved good results in data transmission rates. However, mobile WiMAX based on the IEEE 802.16e standard has now evolved along another route and can be used as an alternative to previous technologies.

Why is WiMAX a compelling technology? First, the construction of a WiMAX-based wireless communication system has considerable efficiency-the data transmission rate is expected to reach 3 times of 3G, and the spectrum utilization can reach 2 times, but the cost is only half of 3G.

Secondly, WiMAX air interfaces use OFDMA (orthogonal frequency division multiplexing access) technology, while OFDM (Orthogonal Frequency Division Multiplexing) is the industry's development trend. Because the standard wireless data transmission rate needs to grow from several Mbps to hundreds of Mbps, OFDM is required. With the popularization of OFDM technology, its R & D and production costs will be greatly reduced.

In addition, WiMAX is more suitable for industry-wide unification because it has no compatibility issues with previous systems.

Therefore, WiMAX may become a technology for building a global wireless broadband network across countries, and it is not subject to standards, patent technology, taxation, and other issues.

What are the main technical advantages of WiMAX?

First, WiMAX is based on IEEE 802.16d/e (d based on fixed network and e Based on Mobile Network) standards. It has the same data transmission rate as DSL and broadband cable, but has better mobile flexibility. In addition, it supports network connections with NGMN (next-generation mobile network) and IMS (IP Multimedia Subsystem) technologies.

Secondly, from the perspective of architecture and network development prospects, WiMAX provides a variety of use models with good security and QoS (Service Quality) assurance capabilities, supports low-latency applications such as VoIP and Multimedia Streams. It can also optimize large-capacity services for IP-based transmission and be connected to the cellular network and wired network. In addition, it can be used for broadband access in residential, enterprise, field and public places.

In addition, some technical features of WiMAX also make it a competitive technology. For example, a wide-domain system allows a base station to cover several kilometers. The 802.16e physical layer uses TDD (time-division duplex) technology, different transmission rates can be provided for the uplink and downlink to improve their utilization. The 802.16e media access control layer uses the Bandwidth Reservation algorithm to improve the bandwidth utilization; all higher-level IP network architectures can be transparently operated on WiMAX.

How WiMAX can coexist and work together with other technologies is another concern. Although WiMAX can effectively support the VoIP service, it does not replace the language service or compete with the existing 2G and 3G protocols. Cellular Networks have a wide coverage rate required for Circuit Switched speech services, while WiMAX has no advantage in this regard. Although the WiMAX physical layer Specification defines FDD (FDD) full duplex and half duplex mechanisms, it is not implemented yet. Although FDD provides better low-latency performance for speech and other applications, WiMAX performs much better than 3G for non-speech applications, such as high-speed data transmission, multimedia, and mobile Internet.

Now, why are there so many arguments? However, the debate continues.

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3. Who is the sky for WiMAX to perish?