microcells - Maxwell

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• Because microcells have such small, narrow patterns, it is difficult to obtain general coverage this way. • Consequently the original large cells (microcells) are left in place, so that calls can be handed off between microcells and conventional cells as required. • The microcells must use different frequencies than the overarching conventional cells, of course; this is accomplished by assigning to the microcells some of the channels that were formerly used by the macrocells.
• A microcell is often under the control of a conventional cell site, with which it usually communicates by microwave radio. • The microcell may itself be divided into several zones. • Figure 3.10 illustrates how microcells and conventional cells (sometimes called macrocells) can work together. • In order to save costs, many microcell sites are not true transceivers but are only amplifiers and frequency translators. Figure 3.11 shows the idea.
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 and 8: Traffic and Cell Splitting • The
Page 9 and 10: • Phone traffic is defined in erl
Page 11 and 12: Microcells, Picocelles and Repeater
Page 13: Fig. 3.9 Microcell site [1]
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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