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Um Interface and Radio Channels

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Contents Overview Processing of Voice Signal Radio Channel

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Radio Interface

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Hierarchical Structure of Um Interface

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Radio Access Technology

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Radio Access Technology

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Contents Overview Processing of Voice Signal Radio Channel

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Voice Signal Processing

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Analog-Digital Conversion

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Speech Coding The Enhance Full Rate coding mode is called CELP (Code Excited Linear Predictive Coding) The Full Rate coding mode is called RPE-LTP (Regular Pulse Excited-Long Term Prediction). The Half Rate coding mode is called VCELP (Vector-Sum Excited Linear Prediction)

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Channel Coding

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Interleaving

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Interleaving

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Voice Burst

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Voice Signal Processing

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Timing Advance (TA)

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Timing Advance (TA)

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Frequency Hopping

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Frequency Hopping

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DTX DTX: Discontinuous Transmission Shut off the transmission at voice intervals; Only transmit SID frames’ The transcoder at the RX terminal produces comfortable noise. VAD: Voice Activity Detection Implemented by the transcoder.

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Power Control Prolong battery life Reduce network interference Include both uplink power control and downlink power control Level and quality are taken into account BSC or BTS is the final adjudicator