5G NR毫米波白皮书（英文版）.pdf

ALL THINGS 5G NR mmWAVE AN UPDATE ON 5G NR MILLIMETER WAVE (mmWAVE) NETWORK PERFORMANCE AND NEW USE CASES January 2021 Prepared by Signals Research Group We wrote this whitepaper on behalf of Qualcomm. The test results presented in this paper are based on a combination of testing that we had done previously for our subscription-based Signals Ahead publication as well as testing that we did as part of this study. In addition to providing consulting services on wireless-related topics, including performance benchmark studies, Signals Research Group is the publisher of the Signals Ahead and Signals Flash! research reports (Page 2 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases Key Highlights A lot has happened with 5G NR (New Radio) in the last year since we published our first paper for Qualcomm on 5G NR. In addition to the proliferation of new 5G NR smartphone models, including mid-tier 5G NR smartphones, there have been several technology advancements which have made 5G NR easier to deploy, capable of achieving even higher data speeds, and introduced compelling new use cases. As an update to last years whitepaper, we highlight some of the advancements associ- ated with 5G NR mmWave (millimeter wave), or 5G NR deployed in millimeter frequency bands, specifically 28 GHz and 39 GHz in North America. The most effective means of increasing data speeds is to increase the bandwidth of the radio channel(s) serving the mobile device. In the last several months the wireless ecosystem has increased the amount of mmWave bandwidth providing downlink and uplink data transfers, literally doubling the channel bandwidth in both directions by introducing larger downlink and uplink carrier aggregation schemes. Specifically, network infrastructure, chipsets, and mobile devices in North America now support eight 100 MHz channels (8x100 MHz or 8CC) in the downlink direction and two 100 MHz channels (2x100 MHz or 2CC) in the uplink direction. Previously, the limitation was 4CC in the downlink direction (cell site to mobile device) and 1CC in the uplink (mobile device to cell site). In addition to increases in user data speeds, there are new 5G NR mmWave use cases, thanks to technology advancements as well as to the overall market maturity. Operators have always been inter- ested in using 5G NR mmWave to offer fixed wireless access (FWA) services, and with the recent introduction of high-power CPEs (consumer premise equipment) and slight modifications to the configuration of the mmWave radio channel, the prospect of mmWave FWA is compelling. In addi- tion to extending the effective range of the mmWave signal to several kilometers versus a few blocks, the high-power CPE enables mmWave signals to provide meaningful data speeds with near- and even non-line-of-sight (NLOS) radio conditions. 5G NR mmWave services are no longer limited to outdoor deployment scenarios. When deployed indoors, mmWave cell sites provide surprisingly good coverage for enterprise use cases. In effect, the mmWave signals extend well beyond LOS conditions, providing coverage in front and behind the 5G NR mmWave radio, as well as around hallway corners and into individual office spaces, thanks to the reflective nature of the mmWave signals. Key highlights from our benchmark testing, which we cover in this whitepaper, include the following: 5G NR mmWave smartphones which support 8x100 MHz channels achieved nearly twice the data speeds as a smartphone, which is limited to 4x100 MHz channels, in side-by-side testing. Data speeds well above 3 Gbps are readily obtained in a commercial network. In addition to achieving higher data speeds, the 8CC feature is ideal for typical use cases, such as streaming video. We benchmarked the performance of 4K video streaming, including up to four individual 4K video streams to a single smartphone. In addition to delivering higher video quality, there werent any video delivery impairments with substantial video impairments while using LTE as the radio bearer. 5G NR smartphones with 2CC uplink capabilities achieved nearly twice the data speeds as smartphones which only supported a single 100 MHz uplink radio channel. Uplink data speeds well above 100 Mbps are readily achieved even though the 5G NR mmWave radio channel dedicates most of its bandwidth to the downlink direction. There have been several technology advancements which have made 5G NR easier to deploy, capable of achieving even higher data speeds, and introduced compelling new use cases. Operators can now offer 5G NR mmWave fixed wireless access servicesPage 3 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases We tested 5G NR mmWave FWA services at distances up to 5.1 kilometers, reaching nearly 2 Gbps at 1.7 kilometers, or nearly nine city blocks. The high-power CPE also delivered Gigabit- per-second speeds with near- and NLOS radio conditions in a commercial network, even when the CPE was pointed well off-angle from the serving cell site. Uplink data speeds were frequently higher than 100 Mbps, or much higher than possible with most fixed broadband service plans. In our enterprise testing of 5G NR mmWave, we observed Gigabit-per-second data speeds in hallways, a stairwell, and a conference room with the door closed. In many of these test locations, we couldnt see the serving 5G NR mmWave radio, meaning NLOS conditions. We attribute the results to mmWave reflections and the resiliency of mmWave signals which is much better than generally perceived. Despite the progress made in the last year, there are additional opportunities for improvement, including: Channel bandwidths wider than 100 MHz are forthcoming up to 2 GHz is possible, especially when 5G NR supports frequencies above 60 GHz. Improvements in how the network simultaneously schedules downlink and uplink data traffic over 5G NR and LTE will result in higher data speeds and more effective use of 5G NR and LTE network resources. Uplink carrier aggregation schemes beyond 2x100 MHz (2CC) will result in even higher uplink data speeds. 5G NR carrier aggregation schemes pairing sub 6 GHz and mmWave bands will improve down- link/uplink data speeds and extend the effective coverage of other compelling 5G NR attributes across an operators footprint. Pending commercial support in early 2021 for some of the mmWave coverage enhancement features that we tested when we observed coverage at 5.1 kilometers in Wisconsin will make the case for rural mmWave FWA services more compelling. The continued introduction and deployment of 5G NR mmWave small cells that specifically target in-building use cases, including enterprise deployments, will make it easier and more economical to deploy in-building coverage. For this study we primarily used 5G NR devices that we purchased from various retailers. These devices include the LG V60 UW, the OnePlus 8 5G UW, the Samsung Galaxy Note 20 5G UW, and the Samsung Galaxy A71 5G UW. These devices all use the Snapdragon X55 modem-RF system and the QTM525 mmWave antenna module. We also leveraged the Lenovo Flex 5G ACPC (Always Connected Personal Computer), which is powered by the Qualcomm Snapdragon 8cx 5G Compute Platform. For our testing in Chicago, we also used two Samsung Galaxy S20 Ultra smartphones, which use the Snapdragon X55 modem-RF. When testing FW A in Wisconsin we used a Qualcomm CPE reference design while our FWA testing in Minneapolis used the Wistron NeWeb Corpora- tion LRV5-100 Internet Gateway both CPEs use the Snapdragon X55 modem-RF along with the Qualcomm QTM527 mmWave antenna module. Lastly, for the initial uplink testing that we did in Minneapolis we used the Samsung Galaxy Note 10 (Snapdragon X50 modem-RF) and for the AT&T 39 GHz testing we used a Samsung Galaxy S20 Plus (Snapdragon X55 modem-RF). In the next several sections, we highlight results from our testing of 5G NR mmWave networksPage 4 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases Index of Figures Figure 1. Pedestrian Route Downtown Chicago 8 Figure 2. Downlink Throughput 9 Figure 3. 5G NR mmWave Downlink Throughput by component carrier 10 Figure 4. 5G NR mmWave Downlink Throughput first four carriers and second four carriers 10 Figure 5. Lincoln Park Test Location 11 Figure 6. Lincoln Park Test Results by UE with details 12 Figure 7. Lincoln Park Test Results by UE with total throughput 12 Figure 8. 5G NR and LTE PDCP Split Bearer Combining 13 Figure 9. Multi-Screen Content to a Single Smartphone 14 Figure 10. 5G NR mmWave Throughput with Four 4K Video Streams by first four and second four carriers 15 Figure 11. 5G NR mmWave Throughput with Four 4K Video Streams by component carrier 15 Figure 13. 4K Safari Video KPIs streamed over 5G NR mmWave 16 Figure 12. 4K Safari Video streamed over 5G NR mmWave 16 Figure 14. 4K Safari Video streamed over LTE with 2CC 17 Figure 15. 4K Safari Video KPIs streamed over LTE with 2CC 18 Figure 16. 4K Video Impairments with Concurrent 5G NR Download 18 Figure 17. Simultaneous Data Transfer Results to an 8CC-capable 5G NR Smartphone 19 Figure 18. 5G NR mmWave FWA Cell Site 20 Figure 19. Rural Wisconsin 5G NR FWA Test Locations 21 Figure 20. Three Views of the 5G NR Cell Site 21 Figure 21. FWA Test Results 22 Figure 22. Minneapolis and Saint Paul 5G NR mmWave FWA Test Areas 23 Figure 23. mmWave Uplink Data Speeds geo plot 25 Figure 24. mmWave Uplink Data Speeds distribution and average 26 Figure 25. Uplink MIMO Rank Versus BRSRP 26 Figure 26. Uplink Throughput Time Series Plot by device 27 Figure 27. Average Uplink Throughput by device 27 Figure 28. First Floor Downlink Throughput 29 Figure 29. First Floor Downlink Throughput 30 Figure 30. First Floor Beam Indices 31 Figure 31. First Floor Pictures 32 Figure 32. Second Floor Downlink Throughput 33 Figure 33. Second Floor Downlink Throughput 33 Figure 35. Second Floor Pictures 34 Figure 34. Second Floor Beam Indices 34Page 5 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases Figure 36. Second Floor Conference Room Downlink Throughput and Beam Indices 35 Figure 37. Top Beam Index by Radio Carrier 36 Figure 38. Signal Quality by Radio Carrier 37 Figure 39. Serving Cell PCIs During Walk Test 39 Figure 40. Serving Cell Coverage with Multiple Cells Providing Adequate Coverage 40 Figure 41. Second Strongest PCIs (BRSRP -105 dBm) 41Page 6 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases Background Signals Research Group (SRG) has been conducting independent benchmark studies of chipsets, smartphones, and networks since our founding in 2004. Since these studies are done for our subscrip- tion-based Signals Ahead research product, they are completely independent since we monetize the studies through our corporate subscribers which span all facets of the ecosystem on a global basis. We started testing 5G and 5G-like solutions starting in January 2018 when we tested a Verizon Wireless 5GTF (millimeter wave) trial network in Houston, Texas. Since that initial study, weve conducted an additional fourteen 5G NR benchmark studies through the end of 2020. These studies, which weve published in Signals Ahead, have included both mmWave and sub 6 GHz 5G NR networks, not to mention new capabilities and use cases. Recent examples include the Standalone (SA) network architecture (August 2020), Dynamic Spectrum Sharing (DSS December 2020), and mmWave Fixed Wireless Access (FWA December 2020). As part of this study, we conducted additional 5G NR mmWave testing, including 8CC and 2CC uplink in Chicago (October 2020) and long-distance 5G NR mmWave FWA in rural Wisconsin (September 2020). Thanks to our test and measurement partner companies, which we identify in the test methodology section, our studies involve deep analysis of multiple network parameters, so they provide meaningful insight into how networks really perform. If something works well, we can show it. Conversely, if there are performance issues or opportunities for improvement, we can generally find them and iden- tify the likely cause(s) of the problem. Qualcomm reached out to us mid-summer and asked us to update an earlier 5G NR study that we did on behalf of Qualcomm in 2019, this time with a particular focus on mmWave, including recent technology advancements and features, as well as new use cases. This paper includes results and anal- ysis from a mix of tests that we did on our own behalf for Signals Ahead as well as tests that we did specifically for this study. Throughout this paper we identify studies that we did for Signals Ahead and those studies that we did for this paper.Page 7 January 2021 All Things 5G NR mmWave An update on 5G NR millimeter wave (mmWave) network performance and new use cases Higher carrier aggregation schemes, up to 8x100 MHz channels, and PDCP data combining with LTE have more than doubled data speeds since 5G NR was first introduced Although it isnt noticeable to the casual observer, 5G NR smartphones almost always use multiple mmWave radio channels, as well as at least one LTE radio channel, when receiving data (a.k.a. the downlink direction). The use of multiple 5G NR radio channels is called carrier aggregation and it is based on the same underlying principles that originated with 3G (DC-HSDPA) and 4G LTE- Advanced networks. LTE networks and devices can only support a maximum channel bandwidth of 20 MHz (5 MHz with 3G) so to leverage more spectrum and deliver the subsequent higher data speeds, the industry adopted carrier aggregation to logically combine multiple radio channels with an aggregate bandwidth greater than inherently supported by the respective standard. With 5G NR mmWave, the maximum channel bandwidth is presently 100 MHz, although this value will increase with future capabilities, including when 5G NR operates in frequencies greater than 60 GHz. A single radio channel could be up to 2 GHz wide, or 20 x what is possible today. If an operator today has more than 100 MHz of mmWave spectrum they need to use carrier aggregation to allocate all the mmWave spectrum to a mobile device, thereby achieving the maximum possible data speeds. When operators first launched commercial 5G NR mmWave services in 2019, the industry only supported up to four 100 MHz channels, even though some operators had more than 400 MHz of mmWave spectrum. In effect, operators couldnt use all their spectrum or at least they couldnt allocate all their mmWave spectrum to a single mobile device. When we did our first 5G NR mmWave benchmark study shortly after the networks launched, we observed sustained physical layer downlink data speeds of 1.2 to 1.3 Gbps with peak downlink data speeds in the range of 1.5 to 1.6 Gbps. In addition to the 4x100 MHz l