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Signals Ahead - Behind the VoLTE Curtain, Pt. 4
Description: KEY HIGHLIGHTS FROM THIS STUDY
This industry conducted an independent performance analysis of T-Mobile’s Voice over Wi-Fi (VoWi-Fi) service. The testing took place in late June and early July in Northern and Southern California, and included the operator’s VoLTE, 3G HD voice service, and Skype Voice for comparison purposes. Consistent with all of our previous VoLTE-related studies, we collaborated with Spirent Communications and Accuver Americas. Spirent provided us with its Nomad User Experience Analytics System and engineering support to conduct the call quality tests using the industry accepted POLQA algorithm. Accuver Americas provided us with its XCAL-M data collection tool and XCAP post processing software to analyze the lower layer interactions of the smartphones with the cellular network. We look forward to working with both companies on future studies, including more test campaigns related to VoLTE and RCS.
For these tests we used three different smartphones – a Galaxy S6 (Samsung chipset and VoLTE solution), a Galaxy S5 (Qualcomm chipset and VoLTE solution) and an iPhone 5 smartphone. We used the three different smartphones to see if the results varied across platforms. All of our tests involved mobile originated and mobile terminated calls. Generally, we were stationary when we conducted these tests but for purposes of testing handovers, we did interject a bit of mobility into the study (hence the peculiar reference to the little red wagon in the title of the report). We primarily used the VoLTE, 3G HD voice service, and Skype Voice tests to collect baseline results which we could use to compare with the VoWi-Fi results, although these tests also proved useful when it came to identifying potential interoperability issues.
Cutting to the chase, our summary-level conclusion is that VoFi is as good or as bad as the underlying Wi-Fi network. We obtained results which suggest the typical consumer would never notice the difference when switching from VoLTE to VoWi-Fi, let along the actual handover itself. Conversely, we also documented results which weren’t as favorable. In many, but not all, of these instances, we believe that other factors were involved. All this and more in this issue of Signals Ahead….
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.
Contents: 1. Executive Summary 2. Key Observations
3. VoWi-Fi Voice Quality Analysis - Residential 3.1 3G to 3G Voice Calls
3.2 VoLTE to VoLTE and VoLTE to 3G Voice Calls 3.3 3G or VoLTE to VoWi-Fi Voice Calls
3.4 VoWi-Fi to VoWi-Fi Calls with Background Traffic 3.5 VoWi-Fi to VoLTE Handovers
4. VoWi-Fi Voice Quality Analysis – Commercial Public Wi-Fi Access Point 4.1 VoWi-Fi to VoWi-Fi Voice Calls
4.2 VoLTE to VoWi-Fi and VoWi-Fi to VoWi-Fi Voice Calls 4.2 Mixed Mode Voice Calls Including Skype
5. Things that make you go Hmmm 5.1 IMS Registration or Something Else
5.2 3G and VoLTE Calls
5.3 3G to VoWi-Fi and “Wi-Fi Only” Calls 6. Test Methodology
7. Final Thoughts List of Figures
Figure 1. 3G Voice Call Quality – Galaxy S5 and Galaxy S6 Figure 2. 3G Voice Call Quality – Galaxy S6 and iPhone Figure 3. VoLTE Voice Call Quality – Galaxy S5 and Galaxy S Figure 4. VoLTE Voice Call Quality – Galaxy S6 and iPhone Figure 5. VoLTE Voice Call Quality – Galaxy S5 and iPhone Figure 6. 3G to VoLTE Voice Call Quality – Galaxy S6 and Galaxy S Figure 7. VoLTE to VoWi-Fi Voice Call Quality – Galaxy S6 and Galaxy S Figure 8. 3G to VoWi-Fi Voice Call Quality – Galaxy S6 and iPhone Figure 9. VoWi-Fi to VoWi-Fi Voice Call Quality – Galaxy S6 and iPhone
Figure 10. VoLTE to VoWi-Fi Voice Quality with Amazon HD Video Streaming over Wi-Fi – Galaxy S6 and iPhone
Figure 11. VoLTE to VoWi-Fi Voice Quality with Amazon HD Video and Netflix Streaming over Wi-Fi – Galaxy S6 and iPhone
Figure 12. VoLTE to VoWi-Fi Voice Quality with Angry Birds Downloading over Wi-Fi – Galaxy S6 and Galaxy S Figure 13. VoLTE to VoWi-Fi Voice Quality while Sending Emails with Attachments over Wi-Fi – Galaxy S6 and iPhone
Figure 14. VoWi-Fi to VoLTE Handover using Galaxy S6 with VoLTE on Stationary Galaxy S Figure 15. VoWi-Fi to VoLTE Handover using Galaxy S5 with VoLTE on Stationary Galaxy S Figure 16. VoWi-Fi to VoLTE Handover with a High Power Wi-Fi Access Point
Figure 17. VoLTE Physical Layer Throughput and other Attributes involving VoLTE to VoWi-Fi Handovers, I Figure 18. VoLTE Physical Layer Throughput and other Attributes involving VoLTE to VoWi-Fi-Handovers, II Figure 19. VoWi-Fi to VoWi-Fi Voice Quality at San Diego International Airport – Galaxy S6 and Galaxy S Figure 20. VoWi-Fi to VoWi-Fi Voice Quality at San Diego International Airport using United Airlines AP – Galaxy S5 and iPhone
Figure 21. VoWi-Fi to VoWi-Fi Voice Quality at San Diego International Airport using United Airlines AP – Galaxy S6 and Galaxy S
Figure 22. VoWi-Fi to VoWi-Fi Voice Quality at San Diego International Airport using Two Different Wi-Fi SSIDs – Galaxy S6 and Galaxy S
Figure 23. VoLTE to VoLTE Voice Call Quality at the San Diego Convention Center – Galaxy S6 and Galaxy S Figure 24. VoLTE to VoWi-Fi Voice Call Quality at the San Diego Convention Center – Galaxy S6 and Galaxy S5 Figure 25. VoLTE Physical Layer Throughput while calling to a Smartphone using VoWi-Fi
Figure 26. VoWi-Fi to VoWi-Fi Voice Call Quality at the San Diego Convention Center – Galaxy S6 and Galaxy S Figure 27. Skype over LTE to Skype over Wi-Fi Voice Call Quality – Galaxy S6 and Galaxy S
Figure 28. Skype over LTE to VoWi-Fi Voice Call Quality – Galaxy S6 and Galaxy S
Figure 29. VoLTE Physical Layer Throughput while Calling a Smartphone using Skype over Wi-Fi Figure 30. Skype over Wi-Fi to Skype over Wi-Fi Voice Call Quality – Galaxy S6 and Galaxy S
Figure 31. Skype over LTE Physical Layer Throughput while Calling a Smartphone using Skype over Wi-Fi Figure 32. VoLTE to Skype over Wi-Fi Voice Call Quality – Galaxy S6 and Galaxy S
Figure 33. 3G to 3G Voice Call Quality with Narrow Band AMR – Galaxy S6 and Galaxy S Figure 34. 3G to 3G with fallback to NB-AMR
Figure 35. 3G to VoLTE Voice Call Quality with Narrow Band AMR – Galaxy S6 and Galaxy S Figure 36. 3G to VoWi-Fi/VoLTE with fallback to GSM and NB-AMR
Figure 37. VoLTE to VoWi-Fi/3G with fallback to GSM and NB-AMR
Figure 38. 3G to VoWi-Fi Voice Call Quality with Narrow Band AMR – Galaxy S6 and Galaxy S5 Figure 39. 3G to VoWi-Fi Voice Call Quality with Narrow Band AMR – Galaxy S6 and Galaxy S5 Figure 40. Lower Layer Analysis during 3G to Wi-Fi Voice Call
Figure 41. 3G to VoWi-Fi Only with fallback to NB-AMR
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