By Benny Bing
This ebook discusses the layout, functionality and implementation of entry protocols with emphasis on how such protocols can successfully aid disparate periods of multimedia site visitors. those protocols are deployed or experimented in numerous broadband instant environments resembling instant ATM, satellite tv for pc networks, cellular mobile and private verbal exchange structures, instant neighborhood loops, instant neighborhood sector networks, and others. along with a accomplished advent and survey to the evolution of entry protocols, a few of the most popular subject matters of present curiosity are coated. those comprise:
- Connection keep an eye on and QoS provisioning.
- site visitors load balancing suggestions.
- advancements in complex CDMA/TDMA/OFDM structures.
- overseas standardization efforts (e.g., 3G, IMT 2000).
- rising broadband instant entry (e.g., instant ATM, satellite tv for pc ATM, high-speed instant LANs).
- the full layout, functionality research, simulation and protocol verification of a generalized broadband a number of entry protocol.
whereas engineering points are mentioned, the emphasis is at the actual figuring out of entry protocols, from easy proposals to the most recent recommendations. Mathematical remedy is saved to a minimal, and so much of the elemental thoughts are defined in keeping with instinct and insights, supplemented through quite a few illustrative figures. additionally, those options are expressed succinctly and concisely. anyplace attainable, very important references that make significant contributions to the box are incorporated for readers to enquire additional. newest updates and necessary internet assets are published on the book's net web site.
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Extra resources for Broadband Wireless Access
2 CHARACTERIZING APPLICATIONS A key requirement for networks carrying multimedia traffic is that multiple sources, each requiring a different QoS, must be allocated the appropriate bandwidth. To achieve this objective, these statistically multiplexed traffic sources must be properly characterized. An application can be characterized by its information type and delivery requirements. A multimedia application can send any combination of real-time and nonreal-time transfers of timebased and nontime-based information.
10 – 31. [LEE94] Lee, E. , Digital Communications, Kluwer Academic Publishers, 1994. [LI95] Li, V. , “Personal Communications Systems”, Proceedings of the IEEE, September 1995, pp. 1208 – 1243. , “Wideband Frequency and Time Domain Models for the Indoor Radio Channel”, Proceedings of IEEE GLOBECOM, 1991, pp. 1135 – 1140. [PAHL95] Pahlavan, K. , Wireless Information Networks, John Wiley, 1995. , “Trends in Flandover Design”, IEEE Communications Magazine, Vol. 34, No. 3, March 1996, pp. 82 – 90. , Cellular Radio and Personal Communications, IEEE Press, 1995.
This is attributed to the fact that for a given frequency, the attenuation in a radio channel is typically reciprocal. For example, a TDD system can have the base station select the best signal from its antenna when receiving a specific signal from a user. When the base station next transmits to that user, it employs the same antenna. Note that while the channel is reciprocal in attenuation, this may not apply to the carrier to interference ratio. Thus, dual antennas may still be needed for a TDD system.