ETSI
5.4.2 NAS Synchronization Indicator - Satellite Optimized Low Data Rate Voice Codec ................................. 25
5.5 DTMF Transmission ........................................................................................................................................ 25
6 CS User Plane for the 64 kbit/s Synchronous Circuit Switched Service ................................................ 25
6.1 General Architecture ........................................................................................................................................ 25
6.2 64 kbit/s CS User Plane Handler (BCSH) - UE Side ....................................................................................... 27
6.2.1 64 kbit/s BCSH Services Provided to Upper Layers [UE] .......................................................................... 27
6.2.1.0 General .................................................................................................................................................. 27
6.2.1.1 64 kbit/s CS Service Primitives at HL-SAP [UE] ................................................................................. 27
6.2.2 64 kbit/s CS Service, Services Expected from Lower Layers [UE] ............................................................ 27
6.2.2.0 General .................................................................................................................................................. 27
6.2.2.1 64 kbit/s CS Service Primitives at TM-SAP [UE] ................................................................................ 28
6.2.3 64 kbit/s BCSH [UE] Architecture and Behaviour ..................................................................................... 28
6.2.3.0 General .................................................................................................................................................. 28
6.2.3.1 64 kbit/s [UE] Transmit Behaviour [Return] ........................................................................................ 28
6.2.3.2 64 kbit/s [UE] Receive Behaviour [Forward] ....................................................................................... 29
6.3 64 kbit/s CS User Plane Handler (BCSH) - RNC Side .................................................................................... 29
6.3.1 64 kbit/s Services Provided to Upper Layers [RNC] .................................................................................. 29
6.3.1.0 General .................................................................................................................................................. 29
6.3.1.1 64 kbit/s Service Primitives at RL-SAP [RNC] .................................................................................... 29
6.3.2 64 kbit/s Services Expected from Lower Layers [RNC]............................................................................. 29
6.3.2.0 General .................................................................................................................................................. 29
6.3.2.1 64 kbit/s Service Primitives at TM-SAP [RNC] ................................................................................... 30
6.3.3 64 kbit/s BCSH [RNC] Architecture and Behaviour .................................................................................. 30
6.3.3.1 Iu UP Configuration .............................................................................................................................. 30
6.3.3.2 64 kbit/s [RNC] Transmit Behaviour [Forward] ................................................................................... 30
6.3.3.3 64 kbit/s [RNC] Receive Behaviour [Return] ....................................................................................... 30
6.4 Plesiochronous and Transmission Schedule Buffer Considerations ................................................................. 31
6.4.0 General ........................................................................................................................................................ 31
6.4.1 Plesiochronous/transmission schedule Buffer Requirements at the UE ..................................................... 31
6.4.2 Plesiochronous/transmission schedule Buffer Requirements at the RNC ................................................... 31
6.5 Discontinuous Transmission (DTX) for 64 kbit/s Service ............................................................................... 32
6.5.1 General Introduction ................................................................................................................................... 32
6.5.2 64 kbit/s DTX - Mandatory and Optional Requirements ............................................................................ 32
6.5.3 Enabling/Disabling and Selecting DTX algorithm ..................................................................................... 32
6.5.4 Terminology ............................................................................................................................................... 32
6.5.5 Choosing the appropriate DTX algorithm .................................................................................................. 32
6.5.6 DTX for 64 kbit/s UDI Service - Data Activated DTX Algorithm ............................................................. 33
6.5.7 DTX for 3,1 kHz Audio Services - Voice Activated DTX algorithm ......................................................... 34
6.5.8 Maintenance Burst for 64 kbit/s DTX (UDI and 3,1 kHz Audio) ............................................................... 34
6.5.9 Behaviour for CSH and DTX Algorithm Selection for 64 kbit/s CS Bearer .............................................. 35
7 Packet Switched User Plane ................................................................................................................... 35
7.0 Overview .......................................................................................................................................................... 35
7.1 PDCP Protocol ................................................................................................................................................. 35
7.1.0 General ........................................................................................................................................................ 35
7.1.1 Disabling of IP Header Compression Per Connection ................................................................................ 36
7.1.1.0 General .................................................................................................................................................. 36
7.1.1.1 RNC Behaviour (Mandatory) ................................................................................................................ 36
7.1.1.2 UE Behaviour (Optional) ...................................................................................................................... 36
7.1.2 PDCP Behaviour for operation with BM domain ....................................................................................... 36
7.2 TFT Handler ..................................................................................................................................................... 36
7.2.1 UE User Plane Protocol Stack Overview .................................................................................................... 36
7.2.2 TFT Based Compression Approach ............................................................................................................ 37
7.2.2.0 General .................................................................................................................................................. 37
7.2.2.1 IPv4 operation ....................................................................................................................................... 37
7.2.2.1.1 IP Version ........................................................................................................................................ 37
7.2.2.1.2 IHL .................................................................................................................................................. 38
7.2.2.1.3 ToS (/DSCP) .................................................................................................................................... 38
7.2.2.1.4 Total Length .................................................................................................................................... 38
7.2.2.1.5 Identification ................................................................................................................................... 38
7.2.2.1.6 Flags/Fragment Offset ..................................................................................................................... 38
