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1 © Nokia Siemens NetworksConfidential
Realities of LTE Deployment
Bill Payne
Head of Innovation Team
CTO Office
Agenda
Expectations
Deployment Case Study
Challenges
Conclusion
Long Term Evolution (LTE) Performance
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LTE Performance
• Exceeded early LTE Targets
• Results confirm LTE’s value and leadership
Key Performance Metrics1 – Infrastructure 20MHz TD-LTE
Single User Peak Throughput Downlink (Mbps) 172.8
Single User Peak Throughput Uplink (Mbps) 85.6
Round Trip Time for a 32 byte Ping <10 ms
Handover Interruption Time (inter-eNB) 279.5 ms
Average Sector Throughput Downlink/Uplink (Mbps)
33.4/15.2
Connection Setup delay 11ms
VOIP capacity (Max Simultaneous Users) – G.711 Codec
95 Users
1 – Achieved results from network trials
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Operators expect 66% of delivered services will be video or video related applications1
Capacity and Performance
1Meet the demands of Mobile Broadband
Over half of all mobile operators expect security to be a key component in their network
Reliability and Security
2Unify and deliver subscriber data across network and services
Operators expect up to 20% TCO savings annually on their network by deploying LTE
Total Cost of Ownership
3Enable cost effective networks
Commercial Expectations
1 – Cisco Virtual Networking index
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Network Details2.3GHz TD-LTE 20MHz Bandwidth (DL 2X2 MIMO & UL 1X2 SIMO)9 Sectors @ 4W (36dBm)Dense Urban outdoor coverageFull Evolved Packet core with PCRF and HSS
Test CasesRF TestControl Plane/User Plane Latencies & HARQ MechanismCall Continuity and HandoversApplicationsLTE ManagerFail Safety and MME Switchover
Network Case Study
Trial Network Coverage Area - 1.87 by 1.42 Miles
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• Quality of Service functionality• Handover Delay• Interference • Overall Performance
Radio Access Network
Deployment Challenge Examples
User Equipment
Network Management
Planning & Optimization
• UL Tx Power• Battery life
• End to End Management• Configuration Management• Performance Management• Fault Management
• Network Configuration• Performance – e.g., Handover
Optimization
DL Application throughput in the drive test route
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Sample Test Case Findings
RF Path Balance Challenges• Significant interference between sectors resulting in very low througput (DL and UL)
Position 1 - Sector 95 interfering with Sector 98
Position 2 – Sector 95 interfering with Sector 96 or 97
Possible Actions• Multi-frequency Network with inter-frequency handoff features• UE Power Class• ICIC Techniques• Smaller cells with lower DL Tx power
- AWT-like solutions
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Control Plane LatencyMeasuring average network registration time (ATTACH) under different RF conditions
Possible Actions - Medium RF conditions for RSRP and SNIR
Sample Test Case Findings
Message
Run #1 Run #2 Run #3 Run #4
Av (ms)TimeDelta (ms) Time
Delta (ms) Time
Delta (ms) Times
Delta (ms)
PDN Connection Request 55:727 318 02:611 307 52:773 282 55:975 312 304.75RRC Connection Request 55:755 289 02:639 279 52:801 254 56:003 284 276.5Attach Complete 56:044 02:918 53:055 56:287 N/A
Network PerformanceDetermining download throughput performance as a function of the Signal to Interference ratio (SIR) measurement
Table 1: Control Plane Latency
UL Application Throughput as a function of SIR Measurement
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User Equipment: Introducing additional UE Power Class with higher Max UL Tx power will allow better mobile devices performance in an urban environment (multi-path and/or indoor coverage)
Planning & Optimization: Solutions such as SON can enable efficient deployments of 4G networks, and optimize them to deliver better performance
Network Management: End-to-end network visibility and ability to check each UE activity status will offer operators tremendous value in service delivery
Radio Access Network: Small cells and indoor solutions will play a big role in addressing network capacity & improved subscriber experience in densely populated area due to RF propagation and lack of low TX power radios
Conclusions