Tuesday, December 29, 2020

Top 10 Posts for 2020 and Top 5 Videos


Here are the posts, from most popular to the tenth most popular, in descending order of popularity 

1. 5G Dynamic Spectrum Sharing (DSS), May 2020

2. EPS Fallback in 5G Standalone Deployments, Feb 2020

3. How MOCN RAN-Sharing Works, Jan 2020

4. Prof. Andy Sutton: Backhauling the 5G Experience, Jan 2020

5. Key Technology Aspects of 5G Security by Rohde & Schwarz, July 2020

6. Positioning Techniques for 5G NR in 3GPP Release-16, Oct 2020

7. 5G Private and Non-Public Network (NPN), March 2020

8. A Look into 5G Virtual/Open RAN - Part 1, March 2020

9. Interfacing HSS and UDM in 5GS with UDICOM (a.k.a NU1 / Nhss), Sep 2020

10. NTT Docomo's Vision on 5G Evolution and 6G, Jan 2020

There was another post, in the top 5 but I have listed it below. It was an announcement about the Free 5G Training site we launched early this year.

Bonus post*: Free 5G Training, Jan 2020

In addition to the above, we have a very popular and active YouTube channel, here are the top 5 videos that we posted in 2020. 

1. Advanced: Private Networks & 5G Non-Public Networks

2. Intermediate: Vehicle to Everything (V2X) Introduction

3. Beginners: UICC & SIM

4. Part 6: Standalone and Non-Standalone 5G - 5G for Absolute Beginners

5. Beginners: Industry 4.0 & 5G

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Monday, December 21, 2020

Challenges and Future Perspectives of Industrial 5G

Andreas Mueller, Head of communication and network technology at Bosch Corporate Research and Chair of 5G ACIA recently spoke at 'What Next for Wireless Infrastructure Summit' by TelecomTV about Industrial 5G. The following is paraphrased from his presentation 'Industrial 5G: Remaining challenges and future perspectives' which is embedded below: 

5G has the potential to become the central nervous system of the factory of the future, enabling unprecedented levels of flexibility, efficiency, productivity and also ease of use.  At the same time it's also a very special application domain so in many cases there are very demanding QoS requirements. 

Industrial applications have multi-faceted requirements where one case may require very low latencies and high reliabilities for instance, while for others we may need very high data rates (for example HD cameras). There is no single use case with a single set of requirements but many different use cases with very diverse requirements which also have to be supported in many cases at the very same time. 

As we need only a local network with local connectivity, this performance is required only in a very controlled environment; inside a factory, inside a plant. This allows for specific optimizations and makes certain things easier but we also always have brownfields deployments in many cases that means we have to live what we have in place today so that's typically wired communication in some cases it's wi-fi and similar wireless solutions and we have to be able to smoothly integrate a 5G network into this existing infrastructure

The developments towards Industrial 5G started about three years ago i would say and in the meantime it really has become a hot topic everybody is talking about industrial 5G. It has become a focused topic in standardization in 3GPP and some key capabilities already have been standardized which have been briefly outlined in the presentation. 

Good progress has also been made in the ecosystem development so we've established the 5G Alliance for Connected Industries and Automation two and a half years ago which serves as a global forum for bringing all relevant stakeholders together and for driving industrial 5G and we have 76 members today which includes major players from the telco industry but also from the industrial domain and also of course some universities and so on. We have seen the advent of non-public networks (NPN) so for the first time it will be possible for a manufacturers to deploy and operate such non-public networks inside a factory which are to some extent decoupled from the public networks.

If we look at the standardization timeline this is what you get. The first version of 5G release 15 of 3GPP was approved mid last year and it still had a very strong focus on consumer application and enhanced mobile broadband. If you buy 5G today, this is what you get then. Release-16 has for the first time had a very strong focus on industrial applications this has been approved in June this year and it includes features like ultra reliable low latency communication, non-public networks, time-sensitive communication. It means support for time-sensitive networking 5G and also native layer 2 transport so that we don't necessarily need internet protocol but we can directly transmit ethernet frames over a 5G network which again is very important especially for the industrial domain.

Release 17 is currently underway and it will come along with several enhancements of these features. It also has a stronger focus on positioning which is again very important in manufacturing because knowing where things are is a very valuable information and it will be in this new transmission mode called NR RedCap which is somewhere somewhere in between this high-end mobile broadband mode and also this low-end a massive machine type communication and this might be especially suitable for industrial sensors for example and then of course the journey will continue with Release 18 which is still being defined but with a high probability i would say it will more focus on massive iot applications that means tiny little sensors for example which have to be connected using very low energy and low costs and not just the natural next step.

So many things have been done already towards supporting these industrial applications but if you look at factories today there are only very few of them which already make use of 5g and that's because there are still some challenges to be overcome some of them are listed here first of all having the features in the standard is nice but they also have to be implemented in the chipsets and infrastructure components and that still say test takes some time especially if we consider that really 16 is the first release which really has many of the features that make a difference to the industrial domain

Here is a list of the features that can be prioritised for future 5G releases or even for 6G. As Release-17 has just been delayed slightly, quite possible that some of the features expected in 5G may get pushed on to Beyond 5G and even 6G.

Here is the embedded talk

An interview by Dr. Andreas Müller regarding Bosch 5G activities is available here (in German)

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Thursday, December 17, 2020

Conditional Handover (Rel. 16) Explained

Although a couple of SON mobility robustness features have been introduced in LTE radio networks it is still a common problem in some network areas that a high number of handover failures leads to higher drop rates and large numbers of RRC Re-Establishments.

Often these problems occur due to quickly changing radio conditions in the handover preparation phase or after handover execution attempt. 

SON algorithms cannot cope with these dynamic changes of the environment, but improvement is possible if the UE itself is enabled to constantly monitor the radio quality during the handover procedure and finally select the best possible target cell from a list of candidate neighbors. This new feature defined in 3GPP Release 16 for both, NG RAN (5G SA NR) as well as E-UTRAN (LTE), is called "Conditional Handover". The figure below illustrates how it works.

(click on the picture to enlarge)

Step 1 is the RRC Measurement Report indicating that handover to a neighbor cell is required. However, this message contains a list of candidate neighbor cells.

In the figure it is assumed that each of these candidate cells is controlled by a different gNB. Hence, 3 XnAP Handover Preparation procedures are performed and each potential target gNB allocates radio resources for the UE and provides a handover command (NR RRC Reconfiguration message) that is sent back to the source gNB (step 2).

In step 3 the source gNB builds the conditional handover command, which is a NR RRC Reconfiguration message that contains a list of conditional reconfiguration options plus additional RRC measurement configurations that enable the UE to find out which of the possible target cells is the best fit. 

In step 4 the UE makes its handover decision and moves to the cell controlled by target gNB 1.

Here it sends in step 5 the NR RRC Reconfiguration Complete message. 

The target gNB 1 detects the handover completion based on the reception of the NR RRC Reconfiguration Complete message, performs NGAP Path Switch procedure (not shown in figure) and triggers the release of the UE context in source gNB on behalf of sending the XnAP UE Context Release message (step 6).

With this information the source gNB also detects the successful handover completion and orders in step 7 the release of the radio resources provided by target gNB 2 and 3 to which it sends the new XnAP Conditional Handover Cancel message.

As mentioned before the conditional handover is also possible for LTE radio connections. In this case X2AP is used instead of XnAP and LTE RRC instead of NR RRC.

The conditional handover can be performed for all kind of intra-eNB/gNB handover and X2/Xn handover. However, S1/N2 (NG-C) conditional handover is not allowed.


Monday, December 14, 2020

Huawei's Power Digitalization 2025 Summit


Back in October, Huawei held Better World Summit 2020 (a.k.a. "Win-Win Future" Global Online Summit). The theme of this online summit was "Power Digitalization 2025”. Experts and operators shared their ideas, vision and challenges. The following summary was shared by Huawei:

Today, how should global operators respond to opportunities and challenges brought by changes in the digital world, under the rapid development of digital technology and digital economy.

“Energy, as the foundation of the digital world, has become a key part and an important point of competitiveness in the digital economy.” Zhou Taoyuan, President of Digital Power Product Line, Huawei, pointed out that “The entire industry needs to attach greater importance to energy”

With the rapid development of emerging technologies such as 5G, cloud, AI, big data, and the IoT, a digital transformation has kicked off, opening the digital age where things are sensing, connected, and intelligent, "ubiquitous Connected, omnipresent intelligence" is becoming a reality. This has thrown the development of 5G and big data centers into the spotlight. But at the same time, the large-scale and rapid construction of 5G and data centers have brought huge challenges to energy infrastructure, such as increasing energy consumption, long construction periods, and high operation and maintenance costs.

“Pay-as-you-go model is becoming more popular in many countries, as data center owners are looking to a decrease their investment and turn their Capex into Opex. And that goes also for a number of other services as part of running and maintaining data center.” Lilia Severina,Global Major Accounts Director of Uptime Institute,talked about the insights into data center trends at the meeting. “Existing site energy facility cannot meet the power demands of 5G sites. There is a pressing need for reform and innovation in this area.Digitization,intelligent and integrated 5G power system enable faster, more affordable, and simpler 5G network deployment.” Liu Baochang, Deputy Director of Information Energy Department, China Mobile Group Design Institute Co., Ltd, expressed his opinion on the development trend and insights of site power in the 5G era.

Violaine Petit, Sales and Marketing VP of CRT Informatique, shared an interesting case about building data centers of CRT in a castle.“CRT did not just want to build something regular. We wanted to be different. We also wanted to invest in a meaningful project. Based on our business development and rejuvenating the castle, CRT successfully deployed two data centers in the castle to meet the dynamic digital development requirements of government and enterprise users. It can be said that the castle data center not only expands CRT's business boundary, but also can protects the country's cultural heritage, can be said to be two birds with one stone.”

Today, people lead a convenient life because of development of science and technology, while they also worry about the environment. How do we transit towards a net-zero carbon economy? Alberto Carrillo Pineda, Director of Science Based Targets, CDP, has his own view. “This includes changes in policies, technologies, economic structures and patterns of production and consumption, but the most important thing is that we change the way we live today. One of the changes is energy transition. Transitioning from fossil-based to clean and renewable energy and phasing out CO2 emissions in other parts of our economy.”

Zhou Taoyuan said, “Huawei integrates traditional power technologies and digital technologies to achieve power digitalization. In this way, we can use ‘Bit to manage Watt’, and provide simple, green, smart, and reliable digital power solutions to solve challenges faced by traditional power industry. ”

Fang Liangzhou, the Chief Marketing Officer of Huawei Digital Power Product Line, Huawei, said“Huawei uses a target network architecture to guide the planning, construction, O&M, and operation of digital power infrastructure, driving the rapid development of the digital economy. Concerning site power, Huawei proposes implementing 5G without increasing site power-related OPEX, and aims to reduce costs from three aspects as well as tapping into new sources. As for data centers, Huawei proposes a simple, green, smart, and reliable next-generation data center facility that uses the "four reconstructions" initiative to tackle issues such as long data center construction period, high energy consumption, and challenging O&M.”

In the future, Huawei will keep cooperating with global operators to face the challenges and seize the opportunities brought by the digital world. Huawei aims to inject green power into operators and help them grow business sustainably in the future. 

Surprisingly the only video I could find is on Periscope, embedded in the tweet above. You can jump on to the relevant sessions using the timestamps as follows

0:01:20 1. Opening Speech - Zhou Taoyuan, President of Digital Power Product Line, Huawei

0:07:14 2. Building a Net-zero Emissions Economy - Alberto Carrillo Pineda, Director of Science Based Targets, CDP

0:17:18 3. Trend and Insight of Site Power Facility in 5G era - Liu Baochang, Deputy Director of Information Energy Department, China Mobile Group Design Institute Co., Ltd

0:31:30 4. Perspective and Practice of Lithium Battery Application - José Pedro Nascimento, Network Director, Altice Portugal

0:40:10 5. Network Energy-Efficient Operation in EM Market - Li Yao, Deputy Director of NOC, China Mobile Pakistan

0:51:40 6. Trend and Insight of Data Center Facility - Lilia Severina, Global Major Accounts Director of Uptime Institute

1:10:30 7. Prefabricated Modular Data Center Case Sharing - Operator customers

1:16:20 8. Partnering To Power The Digital Datacenter - Violaine Petit, Sales and Marketing VP of CRT Informatique

1:25:10 9. New Era, New Power. PowerX 2025 Target Network - Dr. Fang Liangzhou, CMO of Digital Power Product Line, Huawei

Let me know what you think.

Monday, December 7, 2020

Nokia Lectures in Collaboration with Bangalore University

Nokia recently delivered some lectures virtually to Bangalore University students. The talks covered a variety of talks from LTE to 5G, Security & IMS. The playlist from Nokia is embedded below. The video contains following topics:

Part 1: 5G - General Introduction and IoT Specific Features
Part 2: 5G Overview
Part 3: Network Security Practices and Principles
Part 4: LTE Network Architecture - Interface and Protocols
Part 5: IMS - IP Multimedia Subsystem

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