Signals Ahead: FDD + TDD Carrier Aggregation

  • ID: 3635976
  • Report
  • Region: Global
  • 38 Pages
  • Signals Research Group, LLC
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Now You Can Have Your Coverage And Your Capacity Too!
We recently completed a drive test of the Optus LTE network in Melbourne, Australia, which supports LTE FDD and LTE TDD (x2) carrier aggregation. The objective of this study was to determine the technical maturity of the LTE feature given its tremendous importance in the industry.

Highlights of the Study include the following:

Our Thanks

This study was done in collaboration with Accuver Americas who provided us with its suite of drive test products, including XCAL-M to collect the data and XCAP for the post processing and analysis of the data.

The Facts

Optus has deployed 4 carriers of LTE in 3 different frequency bands: Band 28 (10 MHz - FDD), Band 3 (15 MHz - FDD) and Band 40 (20 MHz x 2 - TDD). Huawei is the infrastructure supplier in Melbourne while we used a Qualcomm MTP as the test device.

The KPIs

We looked at the standard KPIs that we always use when evaluating network performance, with a particular focus on handover latency - or the total time it takes to complete a cell handover involving the primary carrier (Band 3) and the two secondary cells (Band 40). Without question, this metric is one of the most important when it comes to the maturity of the feature. The results are noteworthy.

It’s Nuanced. The dependencies between LTE FDD and LTE TDD are far more nuanced than we had envisioned. FDD may be best for "coverage" and TDD may be best for "capacity" but there is much more to the story.

*SIGNALS AHEAD SUBSCRIPTION INFORMATION

This report is included as part of a subscription to Signals Ahead or it can be purchased separately. Signals Ahead is a research-focused product that is published on a periodic basis. Its clientele include all facets of the wireless ecosystem, including some of the largest mobile operators, the top handset suppliers, the major infrastructure vendors, subsystem suppliers, semiconductor companies and financial institutions, including Wall Street, Private Equity and Venture Capitalists, spread across five continents.
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1. Executive Summary
2. Key Observations
3. FDD + TDD Carrier Aggregation Throughput Analysis
4. FDD + TDD Carrier Aggregation Detailed Analysis
5. Test Methodology
6. Final Thoughts
7. Appendix

List of Figures & Tables

Figure 1. Drive Routes
Figure 2. Physical Layer Throughput Distribution - Nighttime Test Results
Figure 3. Physical Layer Throughput Distribution - Afternoon test results
Figure 4. Primary and Secondary Carriers Activation Times
Figure 5. Primary and Secondary Carriers Activation Times - LTE FDD + LTE TDD
Figure 6. Primary and Secondary Carriers Activation Times - LTE FDD + LTE FDD
Figure 7. LTE FDD - LTE TDD Utilization Geo Plot
Figure 8. LTE FDD-only or LTE TDD-only Utilization Geo Plot
Figure 9. Primary and Secondary Carrier Throughput and Serving Cell PCI versus Time
Figure 10. Primary and Secondary Carrier SINR and Serving Cell PCI versus Time
Figure 11. Primary and Secondary Carrier RSRP and Serving Cell PCI versus Time
Figure 12. Primary and Secondary Carrier Throughput and Serving Cell PCI versus Time
Figure 13. MCS Distribution by Carrier - Nighttime Tests
Figure 14. MCS Distribution by Carrier - Afternoon Tests
Figure 15. SINR Distribution by Carrier - Nighttime Tests
Figure 16. SINR Distribution by Carrier - Afternoon Tests
Figure 17. RSRP Distribution by Carrier - Nighttime Tests
Figure 18. Primary Cell Physical Layer Throughput as a Function of SINR - nighttime tests
Figure 19. Secondary Cell #1 Physical Layer Throughput as a Function of SINR - nighttime tests
Figure 20. Secondary Cell #2 Physical Layer Throughput as a Function of SINR - nighttime tests
Figure 21. MAC Layer Throughput as a Function of the Primary Carrier Downlink Path Loss - nighttime tests
Figure 22. Primary Carrier MCS Values as a Function of the Primary Carrier Downlink Path Loss
Figure 23. Secondary Cell #1 MCS Values as a Function of the Primary Carrier Downlink Path Loss
Figure 24. Secondary Cell #2 MCS Values as a Function of the Primary Carrier Downlink Path Loss
Figure 25. SINR as a Function of Downlink Path Loss - afternoon tests
Figure 26. XCAL in Action
Figure 27. Distribution of Physical Layer Throughput - total throughput and by primary and secondary carriers
Figure 28. Distribution of Physical Layer Throughput - by primary and secondary carriers
Figure 29. Primary and Secondary Carrier SINR and Serving Cell PCI versus Time
Figure 30. Primary and Secondary Carrier RSRP and Serving Cell PCI versus Time
Figure 31. MCS Distribution both With and without 3-CA - Afternoon Tests
Figure 32. Primary Cell Physical Layer Throughput as a Function of SINR - afternoon tests
Figure 33. Secondary Cell #1 Physical Layer Throughput as a Function of SINR - afternoon tests
Figure 34. Secondary Cell #2 Physical Layer Throughput as a Function of SINR - afternoon tests
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