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13.3 cdma2000 AIR INTERFACE 419F-CCCH: Forward Common Control Channel. This common channel is used tosend control information to MSs when they have not been assigned a TrafficChannel. When compatibility with IS-95 systems is not necessary, it can be usedfor paging instead of F-PCH. In that case it is paired with F-BCCH, whichhandles overhead and broadcasts. When this channel is used instead of F-PCH,the MS responds to pages on the R-EACH instead of the R-ACH. The frame canbe 5, 10, or 20 ms.F-CPCCH: Common Power Control Channel. This channel is used for powercontrol when a F-FCH or a F-DCCH is not assigned, and when a R-CCCH isused. It is divided into subchannels, each assigned to a different MS. This channelis sometimes referred to as being part of the Forward Indicator Control Channel:for SR-3, the F-CPCCH is the only component, in which case the two are oneand the same; for SR-1, F-CPCCH shares the Forward Indicator Control Channelwith F-RCCH. The frame is 10 ms.F-PDCH: Forward Packet Data Channel. This shared channel is used to carrypacket (user) data. A BS may support up to two of these channels. Data for multipleMSs are time-multiplexed into one channel, under control of the F-PDCCH. It isused only with SR-1 and RC 10. The operation of the F-PDCH involves theF-PDCCH, the R-CQICH, and the R-ACKCH. The frame can be 1.25, 2.5, or 5 ms.F-PDCCH: Forward Packet Data Control Channel. This channel is used to sendcontrol information to MSs for the operation of the F-PDCH. Messages on thischannel contain the ID of the destination MS. Up to two channels may be supportedby a BS. It is used only with SR-1 and RC 10. The frame can be 1.25, 2.5, or 5 ms.F-ACKCH: Forward Acknowledgment Channel. This feedback channel is usedto send acknowledgments of the reception of packet transmissions on the R-PDCH.The frame is 10 ms.F-GCH: Forward Grant Channel. This channel is used to send information on thepacket size to be used by the MS on the R-PDCH. The frame is 10 ms.F-RCCH: Forward Rate Control Channel. This channel is used to control thedata rates of the R-PDCH. It is divided into subchannels, each of which maycontrol one or more R-PDCHs. This channel is sometimes referred to as part ofthe Forward Indicator Control Channel, which it shares with F-CPCCH. Theframe is 10 ms.R-FCH: Reverse Fundamental Channel. This dedicated channel carries userdata with a maximum rate of 14.4 kb/s. For higher data rates, Supplemental Channelsmust be added to the connection. Signaling may be time-multiplexed with userdata on the R-FCH or may be sent separately on the Dedicated Control Channel(R-DCCH). The frame can be 5 or 20 ms.