WiMAX VoIP Solutions for 4G Networks (OCT2010)

[ahmedtaha]

hi all
Table of Contents
Executive Summary ....................................................................................................................................... 7
1 Introduction ......................................................................................................................................... 7
2 VoIP Network Deployment Scenarios ................................................................................................... 9
3 VoIP Ecosystem .................................................................................................................................. 10
3.1 End-User VoIP Termination ......................................................................................................... 11
3.1.1 VoIP Client .......................................................................................................................... 11
3.1.2 Firewall ............................................................................................................................... 12
3.1.3 Router ................................................................................................................................ 12
3.2 WiMAX® Provider ........................................................................................................................ 12
3.3 VoIP ASP Network ....................................................................................................................... 12
3.3.1 Session Border Controller (SBC) ......................................................................................... 12
3.3.2 Softswitch/Feature Server/IMS .......................................................................................... 13
3.3.3 Provisioning Server ............................................................................................................. 13
3.3.4 Media Server ...................................................................................................................... 13
3.3.5 Billing Support, AAA and Online Accounting Servers ......................................................... 13
3.3.6 Gateways ............................................................................................................................ 13
3.4 PSTN Carrier Network ................................................................................................................. 14
4 Quality of Service (QoS) ...................................................................................................................... 14
4.1 WiMAX® Quality of Service .......................................................................................................... 14
4.2 End-to-End Network QoS Challenges .......................................................................................... 14
4.2.1 Latency ............................................................................................................................... 14
4.2.2 Packet Loss ......................................................................................................................... 16
4.2.3 Jitter .................................................................................................................................. 16
4.3 WiMAX®-Specific QoS Challenges ................................................................................................ 16
4.3.1 Wireless QoS Challenges .................................................................................................... 16
4.3.2 Integrated WiMAX® and IP-Based QoS Challenges ............................................................. 17
4.4 WiMAX®-Specific QoS Recommendations ................................................................................... 17
4.4.1 Service Level Agreement .................................................................................................... 17
4.4.2 WiMAX Subscriber Station ................................................................................................. 17
4.4.3 Network Architecture ......................................................................................................... 18
4.4.4 CODEC ............................................................................................................................... 18
4.4.5 Subscribers ......................................................................................................................... 19
4.4.6 Polling Induced Latency ...................................................................................................... 19
4.4.7 Packet Rate ......................................................................................................................... 20
4.4.8 Jitter Buffer......................................................................................................................... 20
4.4.9 Header Compression .......................................................................................................... 20
4.4.10 QoS Classification ............................................................................................................... 21
4.4.10.1 Layer 3 ........................................................................................................... 21
4.4.10.2 Layer 4 ........................................................................................................... 21
4.4.11 WiMAX® QoS Classification Recommendations.................................................................. 22
4.4.12 WiMAX® Airlink Scheduling, Radio Resource Management and Protocols Implementation
Recommendations .............................................................................................................................. 22
4.4.12.1 WiMAX® QoS Scheduling Classes Overview ................................................... 23
4.4.12.2 Airlink Scheduling Class Selection Impacts for DL and UL Bandwidth
Allocation for VoIP Support ............................................................................................... 24
4.4.12.3 HARQ ............................................................................................................. 25
5 Key Performance Indicators (KPIs) ...................................................................................................... 25
5.1 Network KPIs ............................................................................................................................... 26
5.1.1 Data Rate ............................................................................................................................ 26
5.1.2 Latency ............................................................................................................................... 26
5.1.3 Packet Loss ......................................................................................................................... 26
5.1.4 Jitter .................................................................................................................................. 26
5.1.5 VoIP Capacity ...................................................................................................................... 26
5.1.6 Handoff Success Rate (HSR) ............................................................................................... 27
5.1.7 Call Success Rate (CSR) ....................................................................................................... 27
5.1.8 Dropped Call Rate (DCR) .................................................................................................... 27
5.1.9 Summary – WiMAX® E2E Performance for VoIP Support ................................................... 27
5.1.9.1 Delay, Jitter, Packet Loss ................................................................................... 27
5.2 Application Specific KPIs ............................................................................................................. 28
5.2.1 Perceptual Evaluation of Speech Quality (PESQ) ............................................................... 28
5.2.2 R-Score ............................................................................................................................... 28
6 WiMAX Forum® Standardized VoIP Network Solutions Overview ...................................................... 28
6.1 Non-IMS based VoIP over WiMAX® Networks ............................................................................ 29
6.1.1 Non-IMS based WVS Reference Model .............................................................................. 29
6.1.2 Non-IMS based WVS Reference Points for Control Plane .................................................. 30
Reference Point WV1 .......................................................................................................................... 30
Reference Point R2 ............................................................................................................................. 30
6.2 Non-IMS Based WiMAX® VoIP Security Support ......................................................................... 30
6.2.1 User Identity for Security ................................................................................................... 30
6.2.2 WVS Authentication and Authorization Method ............................................................... 30
6.3 IMS-based VoIP over WiMAX® Networks .................................................................................... 30
6.4 Policy control .............................................................................................................................. 33
6.4.1 Benefits of WiMAX® Release 1.5 PCC over 3GPP Release 7 PCC ........................................ 35
7 WiMAX Forum® Standardized Inter-RAT Handover Support for VoIP ................................................. 37
7.1 3GPP/WiMAX® Handoff ............................................................................................................... 39
7.2 3GPP2/WiMAX® Handoff ............................................................................................................. 40
7.3 Wi-Fi/WiMAX® Handoff ............................................................................................................... 40
7.4 QoS and Policy Control................................................................................................................ 42
8 Device Management and Auto-Configuration and Provisioning ........................................................ 42
9 Lawful Intercept (LI) ........................................................................................................................... 44
9.1 WiMAX® and Lawful Intercept .................................................................................................... 44
9.1.1 Requirements ..................................................................................................................... 44
10 Emergency Calls ................................................................................................................................. 45
10.1 FCC Enhanced 911 Requirements ............................................................................................... 45
10.2 Location Identification Methods ................................................................................................. 46
10.2.1 Fixed Location .................................................................................................................... 46
10.2.2 Network Triangulation ....................................................................................................... 46
10.2.3 GPS .................................................................................................................................... 46
10.2.4 Combination of Methods ................................................................................................... 47
10.3 Routing Emergency Calls ............................................................................................................. 47
10.4 Call-Back Number ........................................................................................................................ 47
10.5 Priority During Peak Traffic Times ............................................................................................... 47
10.6 Non-Subscribed WiMAX® Users .................................................................................................. 47
10.7 Operation with Battery Support ................................................................................................. 47
10.8 Local Breakout for Emergency Services (ES) ............................................................................... 48
11 Priority Access for Emergency Telecommunications Service (ETS) ..................................................... 48
12 Roaming ............................................................................................................................................. 48
Conclusion ................................................................................................................................................... 49
Abbreviations .............................................................................................................................................. 50
References ................................................................................................................................................... 54
Annex A ....................................................................................................................................................... 57

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