The Reverse Traffic Channel carries (or other user data) and network signaling data from mobile to the base station, while the Access Channel is used by the mobile to request the base station to set up a call and to respond to Paging Channel messages (call set-up by the. . The Reverse Traffic Channel carries (or other user data) and network signaling data from mobile to the base station, while the Access Channel is used by the mobile to request the base station to set up a call and to respond to Paging Channel messages (call set-up by the. . Uplink is the communication link that transmits the signal from the mobile phone to the network base station (eNodeB, gNodeB, etc. Downlink is the communication link from the base station to the phone. In CDMA networks, the downlink is called a forward channel, and the uplink is called a reverse. . The Forward CDMA channel is the cell-to-mobile direction of communication or the downlink path. It consists of: Pilot Channelis a reference channel which the mobile station uses for acquisition, timing and as a phase reference for coherent demodulation. The access channel is. . In order to be able define the directions of the transmission within a cellular system, the links to and from the base station are defined. The names used within IS-95 and cdma2000 are different to those used for GSM and UMTS. The Reverse Traffic Channel carries (or other user data) and network signaling data from mobile to the base station, while the Access Channel is used by the. . y be 45 or 80MHz wide. The pair of 1. 25MHz band is located either in the 82-893 MHz range in case of cellular CDMA or in the 1850-1989 MHz ran e in case of PCS CDMA. The guard band used in cellular is 45MHz for PC for PCS it is 80 MHZ. In both the cellular and PCS frequency ranges, CDMA channels. .
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