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