microcells - Maxwell

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• A.K.Erlang, a Swedish engineer, studied the problem using statistical analysis early in twentieth century. • He found, not surprisingly, that the more channels there were, the smaller the possibility of blocking for a given amount of traffic. • He found that with more channels, the amount of possible traffic per channel increases for a given blocking probability. • This phenomenon is called trucking gain, and it is the reason a two-provider system is theoretically less efficient than one using a single provider.
• Phone traffic is defined in erlangs (E). One erlang is equivalent to one continuous phone conversation. Thus if 1000 customers use the phone ten percent of the time each, they generate 100E of traffic on average. Mathematically, T = NP • where T is traffic in erlangs, N is number of customers, P is probability that a given customer is using the phone.
Page 1 and 2: 3.6. Cell-Site Equipment • Traffi
Page 3 and 4: Fig. 3. 7 Cellular base station [1]
Page 5 and 6: • Fig. 3.8 Cellular radio system
Page 7: Traffic and Cell Splitting • The
Page 11 and 12: Microcells, Picocelles and Repeater
Page 13 and 14: Fig. 3.9 Microcell site [1]
Page 15 and 16: • A microcell is often under the
Page 17 and 18: • The main cell site up-converts
Page 19 and 20: • Sometimes the problem is not ex
Page 21 and 22: 3.7. Fax and Data Communication Usi
Page 23 and 24: • The greater robustness results
Page 25 and 26: Cellular Digital Packet Data (CDPD)
Page 27 and 28: • When overhead is taken into acc
Page 29 and 30: • Recent advances in data compres
Page 31 and 32: • They lend themselves to time-an
Page 33 and 34: • In the last two lines of Table
Page 35 and 36: Fig. 10.14 TDMA frame [1] • Each
Page 37 and 38: • The data rate available for eac
Page 39 and 40: TDMA Control Channels • The IS-13
Page 41 and 42: Privacy and Security in Digital Cel
Page 43 and 44: Data Communication with Digital Cel
Page 45: References • [1] R. Blake, "wirel

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