By Samuel C. Yang
CDMA2000 is of severe curiosity to instant communications pros simply because this 3G (third iteration) usual presents for speedier info charges, always-on facts carrier, and more desirable voice community potential. Breaking down advanced know-how into easy-to-understand recommendations, this hands-on, system-level source deals RF (radio frequency) and instant process engineers specialist tips in designing, optimizing, and working a CDMA2000 instant community.
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Additional info for 3G CDMA2000 Wireless System Engineering
Note that the R-CCCH is only used when there is no R-DCCH or no R-FCH active on the reverse link. As soon as a reverse dedicated control channel and/or reverse fundamental channel become active, signaling messages are then sent on either one or both of these channels. In a given CDMA carrier, there is a one-to-one correspondence between an F-CCCH and an R-CCCH. Therefore, it is not surprising that the frame formats supported by the R-CCCH are exactly the same as its forward link counterpart. 4 Kbps).
3 Enhanced Access Channel (R-EACH) Although scheduling mobile transmissions on the R-CCCH (when the reverse fundamental channel and/or reverse dedicated control channel are not active) solves the problem of collisions when transmitting large signaling messages, there is still the issue of a mobile’s very first transmission of its access request. This issue is important because the mobile does not (yet) have any assigned channels or resources when it first transmits its access request. To transmit its access request, the mobile uses the R-EACH.
While the forward link can have up to nine different radio configurations, the reverse link can only have up to six. 2 shows these different radio configurations . 0368 Mbps 6 data rates. For a given radio configuration, data rates lower than the maximum are possible. 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. In fact, Radio Configurations 1 and 2 differ from the rest of the radio configurations in that Radio Configurations 1 and 2 use the 64-ary orthogonal modulation to be compatible with IS-95, while Radio Configurations 3 through 6 use the coherent binary phase shift keying (BPSK).