microcells - Maxwell

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Conversion of AMPS to TDMA • It was decided to combine three digital voice channels into one 30-kHz radio channel using TDMA. This is know as full-rate TDMA system. • The first such system went into operation in 1990. • The specifications also encompass a half-rate system with six voice channels in one 30-kHz slot to be implemented at a later date when vovoder technology has improved. • The digital system would seem to be able to carry three times as much traffic as the analog system, but, due to trunking gain. The actual increase for a given level of blocking is greater.
• In the last two lines of Table 3.4, the traffic for various blocking probabilities is shown for both 7- cell sectorized and 12-cell repeating systems. • The numbers of voice chennals are calculated on the basis that one analog channel, for backward compatibility, is available in each cell or sector. • At first, the AMPS control channels were left alone, and only the voice channels were digitized. • This digital specification is known as IS-54B. A later modification (1991), called IS-136, added high-speed digital control channels for better security and additional features. • IS-136 is used both in the 800-MHz cellular radio band and the 1900-MHz PCS band.
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 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: • They lend themselves to time-an
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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