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Content for  TS 45.009  Word version:  18.0.0

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3 Adaptive Multi-Rate inband control and link adaptation  3.1 General operation  3.2 Inband Signalling  3.3 Codec mode adaptation  3.4 Setup procedures  A Example Solution for Link quality estimation  B Example Definition of Mode Command/Request decision thresholds  C Principles for AMR codec mode adaptation with TFO  C.1 Downgrading  C.2 Upgrading  $ Change History 

 

3  Adaptive Multi-Rate inband control and link adaptation  p. 6

3.1  General operation  p. 6

3.1.1  Operation without Tandem Free Operation  p. 6

3.1.2  Operation with ongoing Tandem Free Operation  p. 7

3.1.3  Operation at handover with ongoing Tandem Free Operation  p. 7

3.2  Inband Signalling  p. 7

3.2.1  Frequent inband signalling for AMR codec mode adaptation  p. 8

3.2.1.1  General aspects  p. 8

3.2.1.2  Operation with DTX enabled  p. 8

3.2.1.3  Transmitter/Receiver Synchronisation  p. 8

3.2.2  Robust inband signalling for AMR configuration modification  p. 9

3.2.2.1  General aspects  p. 9

3.2.2.2  RATSCCH protocol  p. 10

3.2.2.3  RATSCCH messages  p. 11

3.2.2.3.1  ACK_OK message  p. 11
3.2.2.3.2  ACK_ERR message  p. 11
3.2.2.3.3  ACK_UNKNOWN message  p. 11
3.2.2.3.4  CMI_PHASE_REQ message  p. 12
3.2.2.3.5  AMR_CONFIG_REQ message  p. 12
3.2.2.3.6  THRESH_REQ message  p. 13

3.3  Codec mode adaptation  p. 13

3.3.1  Channel quality measure  p. 13

3.3.2  Generation of Codec Mode Commands and Requests  p. 14

3.3.3  Performance requirements  p. 14

3.3.3.1  MS response to the Codec Mode Command  p. 14

3.3.3.2  BTS response to the Codec Mode Request  p. 14

3.3.3.3  Performance of the Codec Mode Request Generation  p. 15

3.4  Setup procedures  p. 15

3.4.1  Definition of the AMR Active Codec Set  p. 15

3.4.2  Definition of Codec Mode Command/Request decision thresholds  p. 15

3.4.3  Initial Codec Mode Selection at Call Setup and Handover  p. 17

A  Example Solution for Link quality estimation  p. 18

B  Example Definition of Mode Command/Request decision thresholds  p. 19

C  Principles for AMR codec mode adaptation with TFO  p. 21

C.1  Downgrading  p. 21

C.1.1  Uplink downgrading  p. 21

C.1.2  Downlink downgrading  p. 22

C.2  Upgrading  p. 23

C.2.1  Downlink upgrading  p. 23

C.2.2  Uplink upgrading  p. 24

$  Change History  p. 25

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