By Samuel C. Yang
CDMA2000 is of severe curiosity to instant communications execs simply because this 3G (third iteration) normal offers for quicker facts premiums, always-on info carrier, and enhanced voice community capability. Breaking down complicated expertise into easy-to-understand strategies, this hands-on, system-level source bargains RF (radio frequency) and instant procedure engineers specialist tips in designing, optimizing, and working a CDMA2000 instant community.
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Extra info for 3G CDMA2000 Wireless System Engineering
In this case, let’s assume that a mobile’s assigned paging channel slot is slot Y. 3 Channel format: F-QPCH. As an example, the figure shows two paging indicators located in the second and fourth 20-ms portions of the quick paging channel slot (y). 18 Physical Layer: Forward Link its paging indicators in the quick paging channel slot (y) that comes before the assigned paging channel slot (Y). In a quick paging channel slot, the mobile always monitors two paging indicators. , y2 and y4). So in our example, if two mobiles are both assigned paging channel slot Y, the first mobile may monitor a paging indicator in y1 and a paging indicator in y3; the second mobile may monitor a paging indicator in y2 and a paging indicator in y4.
4. Broadcast control channel has a sequence repetition function between block interleaver and long code scrambler. 14 shows a general block diagram up to right before modulation for forward dedicated control channel, forward fundamental channel, and forward supplemental channel. 14, the demultiplexer converts one input symbol stream into two output symbol streams. It assigns input symbols alternately to the two outputs. As a result, symbols are transmitted using two different paths: I and Q. As we will see later, this quadrature arrangement is one of the reasons why IS-2000 has a capacity higher than that of IS-95.
2. 3. In reservation access mode. In reservation access mode, only a short 5 ms “header” frame and its preamble are transmitted on the R-EACH. 3 12 CRC bits 8 encoder tail bits Examples of 20-ms, 10-ms, 5-ms R-CCCH frames. In terms of frame formats, the frame formats supported by the R-EACH are identical to those supported by the R-CCCH with one important exception. In addition to supporting 20-ms, 10-ms, and 5-ms data frames, the R-EACH also supports a special 5-ms header frame which is used to transmit these short initial access requests4.
3G CDMA2000 Wireless System Engineering by Samuel C. Yang