microcells - Maxwell
microcells - Maxwell
microcells - Maxwell
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• In the last two lines of Table 3.4, the traffic for<br />
various blocking probabilities is shown for both 7-<br />
cell sectorized and 12-cell repeating systems.<br />
• The numbers of voice chennals are calculated on<br />
the basis that one analog channel, for backward<br />
compatibility, is available in each cell or sector.<br />
• At first, the AMPS control channels were left<br />
alone, and only the voice channels were digitized.<br />
• This digital specification is known as IS-54B. A<br />
later modification (1991), called IS-136, added<br />
high-speed digital control channels for better<br />
security and additional features.<br />
• IS-136 is used both in the 800-MHz cellular radio<br />
band and the 1900-MHz PCS band.