microcells - Maxwell

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• The CDPD system monitors the voice channels, using those that are idle to transmit data. • When traffic is detected on the voice channel, the data transmissions cease within 40 ms. • Since this is less than the setup time for a voice call, the voice customer is not affected. • Users, once registered with the CDPD system, can transmit data as required without maintaining a continuous connection and trying up an expensive pair of voice channels. • The bit rate in the RF chennel for CDPD is 19.2 kb/s, achieved using Gaussian minimum-shift keying (GMSK), a form of FSK.
• When overhead is taken into account, the maximum data rate is comparable to that obtained with a 14.4kb/s modem-slow by current wireline standards, but not too bad for wireless. • When the network is busy, the throughput is slower, as packets are stored and forwarded when a channel becomes available.
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: Cellular Digital Packet Data (CDPD)
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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