Content for TS 28.062 Word version: 18.0.0
A In-band Signalling Protocol: Generic Structure
B In Path Equipment: Generic Rules and Guidelines
C Tandem Free Operation in GSM, including AMR-WB
D Tandem Free Operation in 3G including AMR-WB
E TFO Decision Algorithm in C-Code
F Operator's Guide
G Call flows for AMR TFO
H Definition of the Generic Configuration Frames for TFO
$ Change History
A (Normative) In-band Signalling Protocol: Generic Structure p. 99
A.0 Scope of Annex A and Annex B p. 99
A.1 Generic Structure of Inband Signalling Messages p. 99
A.1.1 Frequency and Order of Bit Transmission p. 99
A.1.2 IS_Header p. 100
A.1.3 IS_Command_Block p. 100
A.1.4 IS_Extension_Block(s) p. 101
A.2 Detailed Specification of IS Messages p. 101
A.2.1 IS_REQ Message p. 101
A.2.2 IS_ACK Message p. 102
A.2.3 IS_IPE, IS_TRANS and IS_NORMAL Messages p. 102
A.2.4 IS_FILL Message p. 104
A.2.5 IS_DUP Message p. 104
A.2.6 IS_SYL Message p. 104
A.3 Keep_Open_Indication p. 104
A.4 Rules for Sending of IS Messages p. 105
A.5 System Identification and IS_System_Identification_Block p. 106
B In Path Equipment: Generic Rules and Guidelines p. 108
B.1 Types of In Path Equipment p. 108
B.2 IS_Compliant IPEs p. 109
B.3 IPE State Representation p. 110
B.3.1 IPE in Sync_Not_Found p. 112
B.3.2 IPE in Sync_Found p. 112
B.3.3 IPE in Sync_Lost p. 112
B.3.4 IPE in Keep_Open_Sync p. 113
B.3.5 IPE in Keep_Open_Lost p. 113
B.4 IPE Error Handling p. 113
B.5 IPE Transmission Delay p. 113
B.5.1 IPE Transmission Delay in Normal_Mode p. 114
B.5.2 IPE Transmission Delay in Transparent_Mode p. 114
B.6 Compliance to IS Messages p. 114
B.6.1 Compliance to IS_REQ and IS_ACK Messages p. 114
B.6.2 Compliance to IS_NORMAL Message p. 114
B.6.3 Compliance to IS_TRANS_x Messages p. 115
B.6.4 Compliance to IS_TRANS_x_u Messages p. 115
B.6.5 Compliance to IS_FILL Message p. 115
B.6.6 Compliance to IS_DUP Messages p. 116
B.6.7 Compliance to IS_SYL Messages p. 116
C (Normative) Tandem Free Operation in GSM, including AMR-WB p. 117
C.1 Scope p. 117
C.2 Overview p. 117
C.2.1 TFO_TRAU p. 118
C.2.2 TFO_BSC p. 118
C.2.3 TFO_BTS p. 119
C.2.4 Modifications of the Codec Type and/or the Codec Configuration p. 120
C.3 TFO_TRAU p. 121
C.3.1 Rx_TRAU Process p. 122
C.3.2 Tx_TRAU Process p. 122
C.3.2.1 Downlink Speech Transmission and DTX handling if TFO is ON p. 123
C.3.2.2 Synchronisation and Bit Errors in Received TFO Frames p. 125
C.3.2.3 Maximum Rate Control p. 125
C.3.3 Tx_TFO Process p. 126
C.3.4 Rx_TFO Process p. 127
C.3.4.1 Search for and Monitoring of TFO Synchronization p. 127
C.3.4.2 Errors in TFO Messages and TFO Frames p. 128
C.3.5 TFO_Protocol Process p. 130
C.4 TFO_BTS p. 132
C.4.1 TFO_States and Transitions p. 132
C.4.2 Handling of downlink DTX in TFO p. 134
C.4.3 Handling of Errors in Configuration Parameters p. 134
C.4.4 Procedures for Round Trip Delay Measurements p. 134
C.5 TFO_BSC p. 134
C.5.1 Resolution of Codec Type Mismatch and Codec Type Optimization p. 134
C.5.2 Role of the BSC for AMR and AMR-WB TFO p. 135
C.6 The Dialogue between TFO_TRAU and TFO_BTS p. 136
C.6.1 Configuration Parameters in AMR-NB TRAU/TFO frames p. 136
C.6.1.1 Configuration Protocol Format p. 136
C.6.1.2 Config_Prot field p. 137
C.6.1.3 Message_No Field p. 137
C.6.1.4 Configuration Parameters Fields p. 137
C.6.1.5 Mapping of the Configuration Parameters on 16 and 8 kbit/s TRAU/TFO frames for AMR Configuration p. 139
C.6.2 TFO and Handover Status of the Connection p. 140
C.7 The Dialogue between TFO_BTS and TFO_BSC p. 141
C.7.1 BSC to BTS messages p. 141
C.7.2 BTS to BSC messages p. 141
C.8 Configuration Parameter Exchange on Abis/Ater and A Interfaces for AMR and AMR-WB p. 142
C.8.1 Protocol for the Exchange of Configuration Parameters p. 142
C.8.2 Initial Configuration at Resource Allocation p. 143
C.8.3 Distant Configuration before TFO is established p. 143
C.8.4 Optimal TFO configuration p. 143
C.8.5 Configuration Exchange in TFO p. 143
C.8.6 Handover_Complete Notification in TFO p. 144
C.9 Location of the TFO Decision Algorithm p. 145
D (Normative) Tandem Free Operation in 3G including AMR-WB p. 146
D.1 Scope p. 146
D.2 Overview p. 146
D.2.1 TFO_TC p. 148
D.2.2 TFO_MSC p. 148
D.3 TFO_TC p. 148
D.3.1 Rx_IU Process p. 149
D.3.2 Tx_IU Process p. 150
D.3.3 Tx_TFO Process p. 150
D.3.4 Rx_TFO Process p. 151
D.3.5 TFO_Protocol Process p. 152
D.3.5.1 Messages from the MSC Server to TFO_Protocol p. 152
D.3.5.2 Messages from TFO_Protocol to Tx_IU p. 152
D.3.5.3 Messages from TFO_Protocol to the MSC Server p. 152
D.3.5.4 Messages between TFO_Protocol and Tx_TFO p. 152
D.3.5.5 Messages from Rx_TFO to TFO_Protocol p. 153
D.3.5.6 Messages from Rx_IU to TFO_Protocol p. 154
D.4 TFO in the RNC p. 154
D.5 TFO_MSC p. 154
D.6 Determination of the Optimal Codec Type and Optimal Configuration Parameters p. 155
E (Normative) TFO Decision Algorithm in C-Code p. 156
F Operator's Guide p. 160
F.1 Avoidance of Codec Type Optimisation p. 160
F.2 Earliest possible TFO Establishment p. 160
F.2.1 Avoidance of Codec Mode Optimisation p. 160
F.2.2 Immediate TFO establishment with Codec Mode Optimisation p. 161
F.3 Usage of AMR Tandem compared to TFO with GSM_EFR, GSM_FR, or GSM_HR p. 161
F.4 Balance between Speech Quality and Network Capacity p. 162
G Call flows for AMR TFO p. 163
G.1 Typical Initialisation for TRAU, TC and TFO Protocol p. 164
G.2 Re-Initialisation during the Call after TFO_Disable p. 165
G.3 TFO_Disable during Operation p. 166
G.4 Immediate TFO establishment for AMR p. 168
G.4.1 Con_Req / Con_Ack used on the TFO Interface p. 168
G.4.2 TFO_REQ_L / TFO_ACK_L used on the TFO Interface p. 169
G.5 Configuration Optimisation p. 171
G.6 AMR TFO: Mismatch Case p. 172
G.7 Intra BSC TFO Handover (TRAU remains) p. 173
G.7.1 TRAU-TC TFO connection p. 173
G.7.2 TRAU-TRAU TFO connection p. 174
G.8 Inter BSC TFO Handover (TRAU changes) p. 175
G.9 Immediate Codec Type Optimization p. 176
H (Normative) Definition of the Generic Configuration Frames for TFO p. 177
H.1 Scope p. 177
H.2 Structure for Generic Configuration Frames p. 177
H.2.1 Frame Structure for 8 kBit/s sub-multiplexing p. 177
H.2.2 Frame Structure for 16 kBit/s sub-multiplexing p. 178
H.3 Coding of Generic Configuration Frames p. 178
H.3.1 Generic Configuration Frame Administration Section p. 179
H.3.1.1 Extendability p. 179
H.3.1.2 Version Handling p. 179
H.3.1.3 Configuration Exchange Protocol p. 179
H.3.1.4 System Identification, TFO and DTX control p. 179
H.3.1.5 Specific Section for the Active Codec Type p. 179
H.3.1.5.1 Specific Section for GSM_FR, GSM_HR, GSM_EFR p. 180
H.3.1.5.2 Specific Section for the AMR Narrow Band Family p. 180
H.3.1.5.3 Specific Section for the AMR Wide Band Family p. 180
H.3.1.6 Spare Bits p. 180
H.3.1.6a TFO and Handover_Notifications Bits p. 180
H.3.1.7 Error Detection and Error Handling p. 180
H.3.2 Configuration Parameter Section p. 181
H.3.2.1 Mapping for Single Codec Type p. 181
H.3.2.2 Codec List p. 182
$ Change History p. 183
