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Content for TR 43.902 Word version: 18.0.0

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5.1 A/Gn based architectures 5.2 GAN Iu Mode 6.1 Enhanced Up 6.2 Combined GANC/SGSN 6.3 GAN Iu Mode 6.4 Comparison of the Proposed Solutions

5 Architecture alternatives p. 11

5.1 A/Gn based architectures p. 11

5.1.1 Enhanced Up p. 11

5.1.1.1 Architecture p. 11

5.1.1.2 Protocol stacks p. 13

5.1.1.2.1 PS Control Plane p. 13

5.1.1.2.2 PS User Plane p. 14

5.1.1.3 Affected Procedures p. 14

5.1.1.3.1 PS mobility overview p. 14

5.1.1.3.2 PDP Context Activation /De-Activation p. 20

5.1.1.3.3 PS Handover procedures between GAN and GERAN/UTRAN p. 26

5.1.1.3.4 CS+PS Handover between GAN and GERAN/UTRAN p. 29

5.1.1.3.5 APN resolution in EGAN mode p. 35

5.1.1.3.6 SMS in EGAN mode p. 38

5.1.1.3.7 EGAN Registration and subscriber management in PS Domain p. 39

5.1.1.3.8 Network Requested PDP Context Activation (NRPCA) p. 42

5.1.1.3.9 Roaming aspects p. 44

5.1.1.4 Terminal architecture and impacts p. 46

5.1.1.4.1 Introduction p. 46

5.1.1.4.2 CS domain Control Plane p. 47

5.1.1.4.3 CS domain User Plane p. 48

5.1.1.4.4 PS domain p. 48

5.1.1.5 EGAN handovers and LA/RA Update signalling p. 51

5.1.1.5.1 Introduction p. 51

5.1.1.5.2 GERAN/GAN Scenario p. 51

5.1.1.5.3 UMTS/GERAN/GAN Scenario p. 53

5.1.1.5.4 GAN Enhancement alternatives p. 53

5.1.1.6 Proxy-Gn Load and Performance p. 54

5.1.1.6.1 Introduction p. 54

5.1.1.6.2 Assumptions p. 55

5.1.1.6.3 CPU Load p. 55

5.1.1.6.4 Memory Consumption p. 56

5.1.1.6.5 Signalling Delay p. 56

5.1.2 Combined GANC/SGSN p. 57

5.1.2.1 Introduction p. 57

5.1.2.2 Architecture p. 58

5.1.2.3 Protocol stacks p. 59

5.1.2.3.1 PS Control plane p. 59

5.1.2.3.2 PS User plane p. 60

5.1.2.4 Affected procedures p. 60

5.1.2.5 Terminal architecture and impacts p. 60

5.1.2.6 Optimization for LLC and SNDCP Layers p. 61

5.2 GAN Iu Mode p. 62

5.2.1 Functional Architecture p. 62

5.2.2 Functional entities p. 64

5.2.2.1 Mobile Station (MS) p. 64

5.2.2.2 Generic Access Network Controller (GANC) p. 64

5.2.3 Control and User Plane Architecture p. 64

5.2.3.1 Circuit Switched (CS) Domain p. 65

5.2.3.1.1 CS Domain - Control Plane p. 65

5.2.3.1.2 CS Domain - User Plane p. 66

5.2.3.2 Packet Switched (PS) Domain p. 67

5.2.3.2.1 PS Domain - Control Plane p. 67

5.2.3.2.2 PS Domain - User Plane p. 68

5.2.3.3 GA-RC (Generic Access Resource Control) p. 68

5.2.3.3.1 General p. 68

5.2.3.3.2 States of the GA-RC sub-layer p. 69

5.2.3.4 GA-RRC (Generic Access Radio Resource Control) p. 70

5.2.3.4.1 General p. 70

5.2.3.4.2 States of the GA-RRC sub-layer p. 70

5.2.4 Security Mechanisms p. 71

5.2.5 High Level Procedures p. 71

5.2.5.1 Mode Selection in Multi-mode terminals p. 71

5.2.5.2 PLMN Selection p. 72

5.2.5.3 Re-selection between GERAN/UTRAN and GAN modes p. 73

5.2.5.3.1 Rove-in (from GERAN/UTRAN mode to GAN mode) p. 73

5.2.5.3.2 Rove-out (from GAN mode to GERAN/UTRAN mode) p. 73

5.2.5.4 GAN Discovery and Registration related procedures p. 73

5.2.5.4.1 Discovery and Registration for Generic Access p. 74

5.2.5.4.2 De-Registration p. 80

5.2.5.4.3 Registration Update p. 81

5.2.5.4.4 Keep Alive p. 82

5.2.5.4.5 Cell Broadcast Information p. 82

5.2.5.5 Void

5.2.5.6 Void

5.2.5.7 GA-RRC Connection handling p. 83

5.2.5.7.1 GA-RRC Connection Establishment p. 83

5.2.5.7.2 GA-RRC Connection Release p. 83

5.2.5.8 Security Mode Control p. 84

5.2.5.9 NAS Signalling Procedures p. 84

5.2.5.10 Mobile Originated CS Call p. 85

5.2.5.11 Mobile Terminated CS Call p. 87

5.2.5.12 CS Call Clearing p. 88

5.2.5.13 CS Handover p. 88

5.2.5.13.1 CS Handover from GERAN to GAN p. 88

5.2.5.13.2 CS Handover from UTRAN to GAN p. 90

5.2.5.13.3 CS Handover from GAN to GERAN p. 92

5.2.5.13.4 CS Handover from GAN to UTRAN p. 93

5.2.5.14 Void

5.2.5.15 Void

5.2.5.16 Void

5.2.5.17 GA-RRC Packet Transport Channel Management Procedures p. 95

5.2.5.17.1 States of the GA-RRC Packet Transport Channel p. 96

5.2.5.17.2 PTC Initial Activation p. 97

5.2.5.17.3 PTC Data Transfer p. 98

5.2.5.17.4 MS initiated PTC Deactivation p. 99

5.2.5.17.5 MS initiated PTC Re-activation p. 100

5.2.5.17.6 Network initiated PTC De-activation p. 101

5.2.5.17.7 Network initiated PTC Re-activation p. 101

5.2.5.17.8 Implicit PTC De-activation due to MS De-registration p. 102

5.2.5.18 PDP Context Activation p. 103

5.2.5.19 Network Requested PDP Context Activation p. 104

5.2.5.20 PS Handover between GERAN and GAN p. 105

5.2.5.20.1 PS Handover from GERAN to GAN p. 105

5.2.5.20.2 PS Handover from GAN to GERAN p. 105

5.2.5.21 SRNS Relocation between UTRAN and GAN p. 105

5.2.5.21.1 SRNS Relocation from UTRAN to GAN p. 105

5.2.5.21.2 SRNS Relocation from GAN to UTRAN p. 107

5.2.6 Terminal Architecture Impacts p. 108

5.2.6.1 Assumptions and Definitions p. 109

5.2.6.2 Impact on CS Control Plane p. 110

5.2.6.2.1 CS Control Plane - Before p. 110

5.2.6.2.2 CS Control Plane-After p. 111

5.2.6.2.3 Summary of CS Control Plane Changes p. 111

5.2.6.3 Impact on CS User Plane p. 112

5.2.6.3.1 CS User Plane-Before p. 112

5.2.6.3.2 CS User Plane-After p. 113

5.2.6.3.3 Summary of CS User Plane Changes p. 113

5.2.6.4 Impact on PS Control Plane p. 113

5.2.6.4.1 PS Control Plane-Before p. 113

5.2.6.4.2 PS Control Plane-After p. 114

5.2.6.4.3 Summary of PS Control Plane Changes p. 115

5.2.6.5 Impact on PS User Plane p. 116

5.2.6.5.1 PS User Plane-Before p. 116

5.2.6.5.2 PS User Plane-After p. 117

5.2.6.5.3 Summary of PS User Plane Changes p. 117

6 Evaluation Section p. 118

6.1 Enhanced Up p. 118

6.2 Combined GANC/SGSN p. 121

6.3 GAN Iu Mode p. 123

6.4 Comparison of the Proposed Solutions p. 126

7 Conclusion p. 133

$ Change History p. 135