I will write down some technical progess and my learning process as I am writiing tech diary. This is not necessarily very technical .. just a little memo on my learning process.

[ Jul 2019 ]

For now (Jul 2019), I am writing comments on this based on the assumption that 6G physical layer will be based on THz(Tera Hertz) technology,
Roughly two major technology of Thz implementation is being discussed. One is based on Optics and the other is based on electronics, but it is highly likely that electonics based technology would be adopted (at least for communication between mobile station and base station).
There are many options to implement this, but preferred one would be transistor based on implementation. Then need to check if a source(osciallator), mixer, power amplifiers can be implemented for the selected technology. I am not the expert on this area, so not in the position to share the latest information on this. If you are interested, you may refer to Ref [11] as a start and follow through the references listed there. It is published in 2011, so I think the technology has been much more matured by now(Jul 2019).
Once the basic components (e.g, Source, Mixer, Amplifer etc) is developed and commercialized, some pioneering test equipment vendor would come up with signal generator and analyzer. Then the industry or academia would start researching on physical channel properties for the target frequency. This is what had done by 5G several years back (see this as an example).
The result on this physical channel properties and propagation model would be a critical step to determine whether the selected technology can be adopted for the new communication technology or not. Once it is determined to be feasible to use the technology, you may start hearing on possible concepts of physical layer protocol issues like waveform, modulation scheme, frame structure etc.
Channel Modeling : As they did for 5G, NYU Wireless is doing pionioring work in this area as well. It seems that they starting researching on this and sharing the research result for a while. Check on NYU Wireless / NYUSIM site.
MAC for Terahertz Communicaition System : Even if there has been some changes in detail in terms of MAC layer between LTE and 5G, the fundmantel mechanism is almost same in LTE and 5G/NR. But it is likely to be drastic change in Terahertz MAC comparing to conventional cellular technology (e.g, LTE, 5G/NR) since the physical layer properties in Terahertz communication would be drastically different. As of now, I don't see any concrete proposals or specification on this, but I would suggest you to start with this survey paper(Ref [15]) as a starter. If you are interested in protocol side (rather than physical layer hardware implementation), this can be a good starting reference.

[ Aug 2019 ]

This month my study has motly focused on reading papers on Machine learning application to this area. At first, I thought the machine learning would mostly for core network optimization, but I learned there has been a lot of research on the application to physical layer process of wireless communication (e.g, detection of modulation scheme, auto encoder etc). See Ref[19]~[26]. I personally recommend you to start with Ref [26] and pick one of specific direction that you want to follow through.

[ Nov 2019 ]

I realized that there are TeraHz physical layer deliverables are defined in Teranova. This seems to be similar activities that we saw from METIS specification at early 5G research. As we saw in the difference between METIS specification and final 3GPP specification, it is not sure how much of this early specification will be adopted by the final industry specification (3GPP), but at least it will be good to shape the overal pictures of Terahertz PHY/MAC.
I see more and more papers coming out in 2019 about applying Machine Learning to Wirless PHY layer especially signal detection, modulation detection ([31],[32],[33])

[ May 2020 ]

A few month ago(Mar 17, 2020), 2nd 6G Summit was held and videos for presentations are posted here. Comparing to those from the 1st summit, most presentations shows more on technical aspect of 6G. I think it is worth watching.

[ Jul 2020 ]

SamSung released a good white paper on 6G : 6G The Next Hyper Connected Experience for All. At least to me, this is one of the best white papers on 6G giving huge insights on 6G on technical aspects. For me, the section 4 (Candidate Technologies) is the most interesting and informative. Esepcially those topics on Terahertz Technologies, Novel Antenna Technologies,Comprehensive AI were the most intersting ones to me.

[ Oct 2020 ]

I read a white paper from 6G channel on the subject of Machine Learning application for 6G : White Paper on Machine Learning in 6G Wireless Communication Networks. I gives a good insight on what is the limitation on the method that are used now and how ML would contribute at each layers of the wireless communication system. The Webinar based on this whitepaper is open in public here : Deep Dive into the White Paper on Machine Learning in 6G Wireless Communication Networks

[ Nov 2020 ]

A good Webinar video is shared in public about PHY and low layer aspect/idea on 6G. Status of Radio Module development for Teraherz and a lot of talks on massive MIMO for 6G etc. See this video on YouTube.

[ Feb 2021 ]

I found a very good paper summarizing the current status of Thz technology and challenges. I think this is the in-depth version of first presentation of this webinar which is also very good.

[ Apr 2021 ]

Here goes an excellent webinar presented in Jan 2021 about trend and future of telecommunication from 1G through 6G with focus on 5G/6H. I also found another very nice webinar (6G Use cases and Technlogies) presented in Jan 2021. This is more with technical point of view and you will get the big picture of several important technical concepts that are very frequently treated in 6G related tech papers.
A well written Whitepaper is out from 6G Channel : White Paper On RF Enabling 6G - Opportunities and Challenges From Technology To Spectrum

[ Jul 2021 ]

I would recommend a few podcast that Wireless Future posted recently : Ep 16. 6G and the Physical Layer (with Angel Lozano), Evolving Mobile Broadband Connectivity Towards 6G, Ep 18. Ever-Present Intelligent 6G Communications (With Magnus Frodigh)
Hera-X released a detailed technical deliverable document : Deliverable D2.1 - Towards Tbps Communications in 6G: Use Cases and Gap Analysis

[ Oct 2021 ]

I just noticed that all the session in 6G Symposium 2021 is now open to public in YouTube. Look into the list of the sessions here. I lot of great technical insights there.

[ Feb 2022 ]

I noticed that Next G alliance issues a report titled 'Roadmap to 6G' you can download here. You would get the good summary of technical issues and roadmap, especially North Americal focus on 6G.
In MWC 2022, Qualcomm demonstrated a Sub-Thz MIMO working at 140 Ghz carrier frequency and 7.5 Ghz Bandwidth and achieving over 100 Gbps data rate. Watch the demo 3 of this video : MWC 2022: Qualcomm demos Advanced MIMO antenna designs.

Articles/Media

Followings are the list of articles mostly for general public. If you think it is too early to talk about 6G when 5G just start being deployed (as of Jan 2020). See my list of articles on 5G and check how early they started talk about 5G. Not very technical, but I found it intresting to observe how public opinion is formed and new technology is planned and evolve.

Beyond 5G: The Roadmap to 6G and beyond (Jul 4, 2017)
With 5G Still in the Works, 6G Is Already Taking Shape (Apr 19,2018)
Get ready for upcoming 6G wireless, too (Jun 28, 2018)
What Will 6G Be? (Jun 29, 2918)
Get ready for 6G mobile networks: 1Tbps speeds, microsecond latency and AI optimisation (Sep 2018)
Forget 5G, China is working on 6G – but what does it do? (Nov 16. 2018)
It's Officially Time to Start Talking About 6G (Mar 15, 2019)
FCC opens up experimental spectrum licenses for 6G (Mar 15, 2019)
The United States Launched 6G Research And Development. The FCC Announced The 6G Test Frequency Band. (Mar 16,2019)
THE FCC CLEARS EXPERIMENTAL FREQUENCIES TO PAVE WAY FOR 6G (Mar 17, 2019)
Why 6G research is starting before we have 5G (Mar 21, 2019)
Towards 6G Networks: Use Cases and Technologies (Mar 28,2019)
Ready for 6G? How AI will shape the network of the future (Apr 19,2019)
Do we need 6G wireless already? 5G engineers debate (Apr 25,2019)
It’s Never Too Early to Think About 6G (May 22,2019)
Samsung kicks off 6G research (Jun 5,2019)
Forget 5G: Samsung Is Already Working on 6G (Jun 5,2019)
Samsung spurs R&D efforts for 6G before 5G becomes mainstream (Jun 4, 2019)
Researchers say 6G will stream human brain-caliber AI to wireless devices (Jun 14, 2019)
6G: What It Is & When to Expect It (Jun 17, 2019)
A glimpse into the future? Report predicts 6G features (Jun 17, 2019)
6G technology market revealed by Mind Commerce (Jun 18, 2019)
The race for 6G mobile technology is already on (Jun 18, 2019)
6G to Support Micro-second Latency for Better Sensing, Imaging, Presence and Location Capabilities, says Mind Commerce (Jun 19, 2019)
Setting the Stage for U.S. Leadership in 6G (Aug 13,2019)
Test and Measurement: Keysight sets sights on 6G(Aug 23, 2019)
Huawei CEO says it’s working on 6G — but the technology is still some 10 years off (Sep 26,2019)
Huawei started research on 6G ‘a long time ago’, CEO says (Sep 30, 2019)
6G: What It Is & When to Expect It (Oct 1, 2019)
6G: Building tomorrow's wireless tech beyond 100 GHz (Oct 4,2019)
Beyond 5G: Sony, NTT and Intel to form 6G partnership (Oct 31, 2019)
China starts development of 6G, having just turned on its 5G mobile network (Nov 7,2019)
China kicks off work on 6G research, state media say (Nov 7,2019)
Japan to develop strategy for 6G wireless communication networks expected around 2030 (Jan 2020)
Japan already developing a plan for 6G (Jan 2020)
Docomo targets 2030 6G launch (Jan 2020)
Docomo says 6G will bring AI everywhere, deliver ‘extreme’ performance (Jan 2020)
6G and the reinvention of mobile (Jan 2020)
NTT DoCoMo declares what 6G should be all about (Jan 2020)
6G: What It Is & When to Expect It (Mar 2020)
Consensus on 6G is gradually forming (Mar 2020)
Why 6G research is starting before we have 5G (Mar 2020)
US prepares for a 6G fight (May 2020)
ATIS Issues a Call to Action to Promote U.S. 6G Leadership (May 2020)
What is 6G Technology? (Aug 2020)
6G Wireless Access – Key Performance Indicators (KPIs) (Aug 2020)
Global Sixth Generation (6G) Wireless Market Outlook Report 2020-2030: Focus on 6G Technology, Solutions, Applications and Services (Sep 2020)
ATIS Launches Next G Alliance to Advance North American Leadership in 6G (Oct 2020)
North American operators stake claim to be leaders in 6G (Oct 2020)
AT&T, T-Mobile, Verizon and more form alliance for 6G leadership (Oct 2020)
Next G Alliance aims to establish North American leadership in 6G (Oct 2020)
Seeking to drive North American 6G tech leadership, the Next G Alliance debuts (Oct 2020)
North America mobile industry starts 6G work with Next G Alliance (Oct 2020)
Next G Alliance Aligned on 6G and Beyond (Oct 2020)
6G technology leadership in the US (Nov 2020)
Towards 6G wireless communication networks: vision, enabling technologies, and new paradigm shifts(Nov 2020)
New Founding Members Strengthen ATIS Next G Alliance as It Sets the Course to Advance North American 6G Leadership (Nov 2020)
Apple, Google start working on 6G (Nov 2020)
Interview: ATIS launches Next 6G Initiative in North America (Nov 2020)
Nokia to be technology lead for EU 6G project (Dec 2020)
The shift to 6G communications: vision and requirements (Dec 2020)
The light way to 6G (Jan 2021)
What Will We Do with 6G? (Jan 2021)
Envisioning the 6G Future (Jan 2021)
Apple already working on 6G technology (Feb 2021)
Apple is currently recruiting engineers to develop 6G wireless technology (Feb 2021)
Fraunhofer Institutes kicks off 6G research project in Germany (Feb 2021)
6G: What It Is & When to Expect It (Feb 2021)
6G: The New Frontier or An Evolutionary Process? (Feb 2021)
Apple Could Be Looking to Develop 6G Wireless Technology, Posts Job Listings for Engineers(Feb 2021)
U.S. and China Square Up in Fight for 6G Dominance (Feb 2021)
Europe puts forward proposal for Joint Undertaking on Smart Networks and Services towards 6G (Feb 2021)
The US and China are already looking at the 6G technology battleground (Feb 2021)
6G Technology Will Have a Major Impact on Devices, Materials, and Communications — Here’s What’s Ahead (Feb 2021)
The Race Towards 6G (Feb 2021)
5 nations: the race to build 6G (Feb 2021)
What is 6G Network: The Answer is Here! (Feb 2021)
6G wireless: What it is and when it's coming (Mar 2021)
FEATURE: 6G communications – myth buster (Mar 2021)
Europe moves towards 6G (Mar 2021)
Is 6G going to break the technology-focus standards mould? (Mar 2021)
Samsung Researcher Named the Chair of ITU-R 6G Vision Group (Mar 2021)
6G: Vast and mysterious promises (Mar 2021)
LG Electronics to step up development of 6G network technology(Mar 2021)
EU Has Granted Over €95 Million in Funding for 6G Research (Apr 2021)
Hexa-X Set to Shape 6G Research Framework for Europe(Apr 2021)
Huawei expects 6G technology to emerge around 2030: Chairman (Apr 2021)
German government announces financing for ‘6G’ technologies (Apr 2021)
6G technology: Domestic trio working on tomorrow's mobile communications (Apr 2021)
Huawei set to launch test satellites for 6G technology verification: report (Apr 2021)
Huawei to reportedly launch test satellites for 6G technology verification in July (Apr 2021)
Five Disruptive Features of Tomorrow’s 6G Networks (Apr 2021)
The 6G revolution (Apr 2021)
What Is 6G Internet and What Will It Look Like? (Jun 2021)
US House Committee Approves 6G Task Force (Jul 2021)
What is 6G Mobile Communications Technology
6G: What It Is & When to Expect It ? (Oct 2021)
6G Is Years Away, but the Power Struggles Have Already Begun (Nov 2021)
6G technology launch likely by 2023-end or 2024, says Ashwini Vaishnaw (Nov 2021)
Five key technologies propelling futuristic 6G use cases (Dec 2021)
LG demonstrates its progress in 6G technology at a Korean exhibition (Dec 2021)
6G technology, 5G and LG – what’s it really all about? (Dec 2021)
Chinese lab claims breakthrough in ‘6G’ mobile technology (Jan 2022)
6G Network: What is it, When will it be Available, and How Fast will it be? (Apr 2022)
Nokia, DoCoMo and NTT hype 6G ahead of MWC - telecoms (Feb 2023)
3GPP - New 6G logo approved (Apr 2024)