realities of lte deployment
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Realities of LTE Deployment. Bill Payne Head of Innovation Team CTO Office. Agenda. Long Term Evolution (LTE) Performance. Expectations. Deployment Case Study. Challenges. Conclusion. LTE Performance. Exceeded early LTE Targets Results confirm LTE’s value and leadership. - PowerPoint PPT PresentationTRANSCRIPT
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