WiMAX Networks: Techno-Economic Vision and Challenges by Ramjee Prasad
By Ramjee Prasad
Ignited through cellphone large good fortune on the finish of final century, the call for for instant companies is continually turning out to be. to stand this call for, instant platforms were and are deployed at a wide scale. those contain mobility-oriented applied sciences similar to GPRS, CDMA or UMTS, and native quarter Network-oriented applied sciences resembling WiFi. your next step in instant communications is broadband instant entry platforms, which supplies ubiquitous web and massive bandwidth. in an effort to create stipulations for a good expertise, addressing interoperability and pageant during this promising industry, a standardization attempt has been led by way of the Institute of electric and digital Engineers (IEEE). the 1st published average was once the IEEE 802.16, which addresses quite a lot of frequencies, and defines the most ideas for the sequence of the IEEE 802.16 mounted instant and cellular criteria released afterwards. The complex air interface of IEEE 802.16m will allow multi-hop relay architectures, roaming and seamless connectivity throughout IMT-advanced and IMT-2000 platforms by using acceptable interworking features. WiMAX Networks covers points of WiMAX caliber of carrier (QoS), safeguard, mobility, radio source administration, a number of enter a number of output antenna, making plans, cost/revenue optimization, actual layer, medium entry keep an eye on (MAC) layer, community layer, and so on.
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Additional info for WiMAX Networks: Techno-Economic Vision and Challenges
Sample text
Although the concept of cellular telephony was developed by Bell Labs before, the first cellular mobile systems began its operation in August 1981 in Sweden. This was called Nordic Mobile Telephone system (NMT). NMT was followed by Total Access Communication System (TACS) in Austria (in 1984), Italy and the UK (in 1985), by C-450 in Germany and by Radiocom2000 in France. These different European systems belong to the first generation (1G) and were totally incompatible with each other. The market situation in Europe was not favourable as there was no single standard to provide economies of scale.
The WARC’92 identified 1885–2025 and 2110–2200 MHz as the frequency bands for the IMT-2000 [7]. The goal of the 3G standards is to provide users with worldwide coverage via handsets that the capability to seamlessly roam among multiple cellular networks. ITU has recommended several different air interfaces for third-generation systems, based on either CDMA or TDMA technology. The specifications for IMT-200 standards are developed by the Third Generation Partnership Project (3GPP) and 3GPP2 [5].
Because ADSL uses frequencies much higher than those used for voice communication, 16 R. J. Velez both voice and data can be sent over the same telephone line. Thus, customers can talk on their telephone while they are online, and voice service will continue even if the ADSL service goes down. ADSL line is an “always on” connection with no dialup required. Unlike cable, however, ADSL has the advantage of being unshared between the customer and the central office. Thus, data transmission speeds will not necessarily decrease during periods of heavy local Internet use.