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Content for TS 48.061 Word version: 18.0.0

1… 4…

4 General approach p. 7

5 Frame structure p. 9

5.1 16 kbit/s submultiplexing p. 9

5.1.1 Frames for Speech Services p. 9

5.1.1.1 Frame for Half Rate speech p. 9

5.1.1.2 Frames for Adaptive Multi-Rate Speech p. 9

5.1.2 Data frame p. 10

5.1.3 O&M frame p. 11

5.1.4 Coding p. 11

5.1.4.1 Coding of frames for speech services p. 12

5.1.4.1.1 Coding of frames for Half Rate speech Control bits (C-bits) p. 12

5.1.4.1.2 Coding of frames for Adaptive Multi-Rate speech p. 13

5.1.4.2 Coding of data frames p. 13

5.1.4.3 Coding of O&M frames p. 14

5.1.5 Order of Bit Transmission p. 14

5.2 8 kbit/s submultiplexing p. 15

5.2.1 Frames for Speech Services p. 15

5.2.1.1 Frame for Half Rate Speech p. 15

5.2.1.2 Frames for Adaptive Multi-Rate Speech p. 15

5.2.1.2.1 Frame for Lower Codec Modes p. 15

5.2.1.2.2 Speech frame for Codec Mode 6,70 kBit/s p. 16

5.2.1.2.3 Speech frame for Codec Mode 7,40 kBit/s p. 16

5.2.1.2.4 Speech frame for Codec Mode 7,95 kBit/s p. 17

5.2.1.3 Frames for Speech Codec Configuration Exchange p. 17

5.2.2 Data frame p. 18

5.2.3 O&M frame p. 18

5.2.4 Coding p. 19

5.2.4.1 Coding for Half Rate Speech and Half Rate Data Services p. 19

5.2.4.1.1 Uplink coding p. 19

5.2.4.1.2 Downlink coding p. 21

5.2.4.2 Coding for Adaptive Multi-Rate Speech p. 22

5.2.4.2.1 No_Speech Frame p. 22

5.2.4.2.2 Speech Frames for 4,75, 5,15 and 5,90 kBit/s p. 23

5.2.4.2.3 Speech Frame for 6,70 kBit/s p. 24

5.2.4.2.4 Speech Frame for 7,40 kBit/s p. 25

5.2.4.2.5 Speech Frame for 7,95 kBit/s p. 25

5.2.5 Order of Bit Transmission p. 25

6 Procedures p. 26

6.1 Remote Control of Transcoders and Rate Adaptors p. 26

6.2 Resource Allocation p. 26

6.3 Resource Release p. 26

6.4 In Call Modification p. 27

6.5 Transfer of Idle Frames, Handling of missing data p. 27

6.6 Procedures for Speech Frames p. 27

6.6.1 Time Alignment of Speech Frames p. 27

6.6.1.1 16 kbit/s submultiplexing p. 28

6.6.1.1.1 Downlink Time Alignment p. 28

6.6.1.1.2 Uplink Time Alignment p. 30

6.6.1.1.3 Initiation at Resource Allocation p. 30

6.6.1.1.4 Time Alignment during Handover p. 30

6.6.1.2 8 kbit/s submultiplexing p. 30

6.6.1.2.1 Downlink Time Alignment p. 30

6.6.1.2.2 Uplink Time Alignment p. 32

6.6.1.2.3 Initiation at Resource allocation p. 33

6.6.1.2.4 Time Alignment during handover p. 33

6.6.2 Procedures for Discontinuous Transmission (DTX) p. 33

6.6.2.1 DTX procedures in the uplink direction p. 33

6.6.2.2 DTX procedures in the downlink direction p. 34

6.7 Procedures for Data Frames p. 34

6.7.1 The RAA Function p. 34

6.7.2 The RA1/RA1' Function p. 35

6.7.3 The RA2 Function p. 35

6.7.4 Procedures for 8 kbit/s intermediate rate adaption rate p. 35

6.7.5 Support of Non-Transparent Bearer Applications p. 36

6.8 Frame Synchronization p. 36

6.8.1 16 kbit/s submultiplexing p. 36

6.8.1.1 Search for Frame Synchronization p. 36

6.8.1.2 Frame Synchronization After Performing Downlink Timing Adjustments p. 36

6.8.1.3 Frame Synchronization Monitoring and Recovery p. 36

6.8.2 8 kbit/s submultiplexing p. 37

6.8.2.1 Search for Frame Synchronization p. 37

6.8.2.1.1 For Half Rate speech and data p. 37

6.8.2.1.2 For Adaptive Multi-Rate speech p. 37

6.8.2.2 Frame Synchronization Monitoring and Recovery p. 38

6.8.2.2.1 For Half Rate speech and data p. 38

6.8.2.2.2 For Adaptive Multi-Rate speech p. 38

6.9 Correction/detection of bit errors p. 38

6.9.1 16 kbit/s submultiplexing p. 38

6.9.1.1 Error Detection on the Control Bits p. 38

6.9.1.1.1 General Procedure p. 38

6.9.1.1.2 Frames for Half Rate speech p. 39

6.9.1.2 Handling of frames received with errors for Half Rate speech and data p. 39

6.9.2 8 kbit/s submultiplexing p. 39

6.9.2.1 Error Detection on the Control Bits p. 39

6.9.2.2 Handling of frames received with errors p. 40

6.10 Procedures for Operation & Maintenance p. 40

6.10.1 Transfer of O&M Information Between the TRAU and the BSC p. 40

6.10.2 Procedures in the TRAU p. 40

6.10.3 Procedures in the BSC p. 40

6.10.3.1 Use of O&M Frames p. 40

6.10.4 Procedures in the BTS p. 41

$ Change History p. 42