VoLTE Deployment Strategies EBook

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ZhongChao
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VoLTE Deployment Strategies EBook

Postby ZhongChao » 18 Mar 2018, 17:12

4 VoLTE Functionality 47
4.1 Overview 47
4.2 Radio Functionalities 47
4.2.1 Bearers and Scheduling 47
4.2.2 Mobility 49
4.2.3 Circuit Switched Fallback Handover 51
4.2.4 Mobility from 2G/3G Back to LTE 54
4.2.5 Power Saving Features 55
4.2.6 Positioning Solutions 56
4.2.7 UE Radio Access Capabilities for VoLTE 57
4.3 EPC Functionalities 58
4.3.1 LTE subscriber identification 59
4.3.2 PDN Connectivity Establishment for the VoLTE User 60
4.3.3 EPS Dedicated Bearer Setup 65
4.4 IMS Identification 65
4.4.1 IP Multimedia Services Identity Module 66
4.4.2 Public User Identity 67
4.4.3 Private User Identity 67
4.4.4 Relationship between Private and Public User Identities 67
4.4.5 Identification of User’s Device 68
4.4.6 Identification of Network Entities 70
4.4.7 Identification of Services (Public Service Identities) 70
4.4.8 Identification Without ISIM 70
4.5 IMS Service Provisioning 71
4.5.1 Enforcement of Allowed Services 72
4.5.2 Service-Triggering Information 73
4.5.3 Selection of AS 75
4.5.4 AS Behaviour 75
4.5.5 Service Provisioning in Action 76
4.6 IMS Multimedia Telephony 79
4.6.1 Introduction 79
4.6.2 Multimedia Communication 80
4.6.3 Supplementary Services 81
5 VoLTE End to End and Signalling 99
5.1 Overview 99
5.2 VoLTE Subscription and Device Configuration 100
5.3 EPS Attach for CSFB/IMS VoIP and Default Bearer Activation 102
5.4 IMS Registration 107
5.4.1 Constructing the REGISTER Request 109
5.4.2 From the UE to the P-CSCF 110
5.4.3 From the P-CSCF to the I-CSCF 110
5.4.4 From the I-CSCF to the S-CSCF 111
5.4.5 S-CSCF Challenges the UE 111
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