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444 AIR INTERFACE SIGNALING IN CDMA NETWORKSFigure 13.4-4. UTRAN frames.during silent pauses, when no speech-carrying bits are transmitted. During suchpauses, control-data transmission (e.g., power control) does not stop and generatespulses in a frequency range that can interfere with electrical equipment. Theproblem is serious only in the uplink direction because MSs may be near susceptibleappliances such as hearing aids.Physical Channels. (“Mapping” refers to Transport Channels.)AICH: Acquisition Indicator Channel. This downlink common channel is used bythe BS to acknowledge receipt of an access request on the PRACH.DPCH: Dedicated Physical Channel. This downlink dedicated channel mapsinto the downlink DCH. The DPCH frame contains the downlink DPCCH andDPDCH subchannels, time multiplexed. The equivalent channels in the uplink,DPCCH and DPDCH, each have their own primary channel.E-AGCH: E-DCH Absolute Grant Channel. This downlink common channelcarries control information (absolute grants) for the E-DCH.E-HICH: E-DCH Hybrid ARQ Indicator Channel. This downlink dedicatedchannel carries control information (ARQ acknowledgments) for the E-DCH.E-RGCH: E-DCH Relative Grant Channel. This downlink dedicated channelcarries control information (relative grants) for the E-DCH.Figure 13.4-5. Examples of slot formats.

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