Radio Operation

Download 3G CDMA2000 : wireless system engineering by Samuel C. Yang PDF

By Samuel C. Yang

CDMA2000 is of severe curiosity to instant communications execs simply because this 3G (third iteration) commonplace presents for quicker information premiums, always-on information carrier, and enhanced voice community skill. Breaking down advanced know-how into easy-to-understand strategies, this hands-on, system-level source bargains RF (radio frequency) and instant process engineers specialist advice in designing, optimizing, and working a CDMA2000 instant community.

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2 16 CRC bits 8 encoder tail bits Examples of 20-ms and 5-ms R-DCCH frames. , the frame formats of the R-DCCH are identical to those of the F-DCCH1) [2]. , when there is no traffic channel assigned), the mobile has to use the only other physical channel that is available–the access channel. But the problem is that the access channel is a random-access channel. This means that mobiles transmit on the access channel more or less randomly; if there is a collision, then the messages are not received by the base station, and the colliding mobiles would have to transmit again.

For a given radio configuration, data rates lower than the maximum are possible. Note that Radio Configuration 1 and Radio Configuration 2 are backward compatible with IS-95 in that they are equivalent to Rate Set 1 and Rate Set 2 of IS-95. For each radio configuration, the table shows the maximum achievable data rate (instead of all possible data rates). 6 Kbps is shown. 3 Signaling Channels 15 configuration the coding rate R is normally the same regardless of the size of the frame (20 ms or 5 ms).

Recall that the quick paging channel is a new physical channel used in IS-2000 to improve the efficiency of sending page messages. For example, a mobile does not have to monitor the F-CCCH all the time for page messages intended for it. Rather, by monitoring its paging indicators on the quick paging channel, the mobile knows whether or not it should start receiving the F-CCCH in the next F-CCCH slot [2]. , system parameters message and access parameters message) to those mobiles in a base station’s coverage area.

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