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

By Samuel C. Yang

CDMA2000 is of severe curiosity to instant communications pros simply because this 3G (third iteration) ordinary offers for quicker information premiums, always-on info provider, and superior voice community potential. Breaking down complicated know-how into easy-to-understand suggestions, this hands-on, system-level source bargains RF (radio frequency) and instant process engineers professional tips in designing, optimizing, and working a CDMA2000 instant community.

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8 shows an example format of the F-CPCCH. Here each F-CPCCH frame (which lasts 20 ms) consists of 16 power control groups. 25 ms). Each power control group contains 12 power control bit positions. This gives a total of 192 power control bit positions per 20-ms frame. In IS-2000, the forward link uses QPSK modulation which consists of two paths: the in-phase (I) path and the quadrature (Q) path. The F-CPCCH is structured in such a way that each path contains separate and distinct power control bits.

The F-SCCH is provisioned to provide backward compatibility with IS-95 (more specifically, IS-95-B [1]). Here we focus our discussions on the forward fundamental and supplemental channels. 1 Functions The IS-2000 F-FCH is similar to the IS-95 forward traffic channel in that the primary function of the F-FCH is to carry user data. The following lists the main purposes of the IS-95 forward traffic channel: • • • • Transmission of voice traffic; Transmission of low-rate data traffic; Transmission of signaling traffic via dim-and-burst and blank-and-burst schemes; Transmission of power control bits to power control the reverse link.

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. Further complicating the situation is that some full-fledge messages, such as the authentication challenge response message and the origination message, are sent on the access channel. The transmission of these longer signaling messages is best done over a channel whose resources are scheduled rather than over one whose accesses are contention-based.

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