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Content for TR 23.977 Word version: 18.0.0

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4 Network deployment scenarios to be studied p. 8

4.1 GSM network architecture before Release 4 p. 8

4.2 UMTS network architecture in Release 99 p. 9

4.3 Packet transport network between MGWs in an A/Iu mode BICN p. 10

4.4 TDM transit network between A/Iu mode PLMNs p. 11

4.5 Packet transport transit network between PLMNs p. 12

5 Call Scenarios to be studied p. 14

5.1 Mobile to Mobile call Scenarios p. 15

5.1.1 BSC to RNC call via BICN p. 15

5.1.2 BSC to BSC call via BICN p. 16

5.1.3 RNC to BSC call via BICN p. 18

5.1.4 RNC to RNC call via BICN p. 19

5.2 Mobile to PSTN call scenarios p. 21

5.2.1 BSC to PSTN call via BICN p. 21

5.2.2 RNC to PSTN call via BICN p. 23

5.3 Roaming and multi-network call scenarios p. 24

5.3.1 BSC (HPLMN) to BSC (VPLMN) call p. 24

5.3.2 BSC (HPLMN) to RNC (VPLMN) call p. 24

5.3.3 RNC (HPLMN) to BSC (VPLMN) call p. 24

5.3.4 RNC (HPLMN) to RNC (VPLMN) call p. 25

5.4 CS domain to IMS interworking scenario p. 25

5.5 A selection of handover scenarios p. 26

5.5.1 BSC to BSC call via BICN with Intra GERAN handover AMR-AMR p. 26

5.5.2 BSC to BSC call via BICN with Intra GERAN handover to AMR - EFR p. 27

5.5.3 BSC to BSC call via BICN: second Handover to EFR - AMR - EFR p. 29

5.5.4 BSC to BSC call via BICN: third handover to AMR - EFR - EFR p. 29

5.5.5 RNC to RNC call via BICN with inter-system handover p. 30

5.5.6 BSC to RNC call via BICN with second intersystem handover p. 31

6 General requirements for architectural solutions p. 31

6.1 Overall requirements p. 31

6.2 Status of specifications for TFO and TrFO in 3GPP p. 32

6.2.1 Support of codec types in TFO and TrFO on various interfaces p. 32

7 Requirements and architectural solutions for Resource Savings p. 32

7.1 AMR-NB configurations p. 33

7.2 AMR-WB configurations p. 33

8 Requirements and architectural solutions for bandwidth savings p. 34

8.1 Background p. 34

8.2 Requirements p. 34

8.3 Architectural solutions p. 35

8.3.1 A-ter interface to the MGW p. 35

8.3.2 MGW collocated with TRAU p. 36

9 Requirements and architectural solutions for speech quality Improvements p. 36

9.1 Requirements p. 36

9.2 Architectural solutions p. 37

9.2.1 Mobile to mobile calls scenarios: 5.1.1 and 5.1.3 p. 37

9.2.2 Mobile to PSTN calls: scenarios 5.2.x p. 37

9.3 Summary p. 37

10 Requirements and architectural solutions for avoiding duplication in transcoder development p. 37

10.1 Background and requirements p. 37

10.2 Architectural solutions p. 38

10.2.1 A-ter interface to the MGW p. 38

10.2.1.1 Description / concept p. 38

10.2.1.2 Difficulties with this concept p. 38

10.2.1.3 Migration aspects p. 39

10.2.1.4 Sample message flow p. 41

11 Conclusions p. 43

A Example for migrating a service to TrFO p. 44

A.1 Service description p. 44

A.2 Realization p. 44

A.2.1 Overview p. 44

A.2.2 High level description p. 44

A.2.3 Message flow for a Release 99 network p. 45

A.2.4 Message flow with BICC and TrFO p. 47

A.2.5 Message flow with split architecture without TrFO p. 49

A.2.6 Message flow with split architecture and TrFO p. 51

A.3 Summary and conclusions p. 53

$ Change history p. 54