microcells - Maxwell

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• For the full-rate system, speech data corresponding to 40 ms of real time is transmitted in 2x6.67 ms = 13.3 ms. • As with analog AMPS, the TDMA system uses separate RF channels for transmit and receive. • Speech encoding is used to limit the bit rate to approximately 8 kb/s for each speech channel for the full-rate system. • The full-rate system allocates two noncontiguous time slots to each voice channel: slots 1 and 4 for the first, 2 and 5 for the second, and 3 and 6 for the third. • Overhead reduces the number of data bits available per time slot to 260.
• The data rate available for each voice channel is 260 bits/20 ms = 13 kb/s. • The voice is actually encoded at 7.95 kb/s and the remaining bits are used for error correction. The half-rate system will use 4 kb/s for voice coding. • The frames are synchronized for the forward and reverse channels, but the timing is offset so that a frame starts 90 bits (1.85 ms) earlier at the mobile. • Each time slot contains 324 bits for both forward and reverse channels. • The allocation of these bits is different for the forward and reverse links, however. • Figure 3.15 illustrates the TDMA voice time slots.
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 and 32: • They lend themselves to time-an
Page 33 and 34: • In the last two lines of Table
Page 35: Fig. 10.14 TDMA frame [1] • Each
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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