IET Lecture: 5G – Getting Closer to Answers?

I was fortunate to be able to hear the IET Appleton lecture last week. The good thing about these lectures are that the speakers get plenty of time to talk about the subject of interest and as a result they can cover the topic in much greater depth.

Some interesting tweets from the evening:

Big Data analytics for Network Optimisation #5G #IETappleton pic.twitter.com/5aj9mVFQRe

— Zahid Ghadialy (@zahidtg) January 14, 2016

This is how to camouflage 5G massive MIMO antennas by Dr. Chih-Lin I, CMRI #IETappleton pic.twitter.com/kgISkmoXMH

— Zahid Ghadialy (@zahidtg) January 14, 2016

5G DSR Shock: rethink Shannon, rethink Ring&Young, rethink Control & Signaling #ietappleton pic.twitter.com/3lfgiZ4m6C

— Martin Jakl (@JaklMartin) January 14, 2016

Here is the video:

 


As I was sitting in the front, I managed to ask a question - "5G is going to be evolution and revolution. Will it be revolution first then evolution or vice versa". If you cant wait to hear the answer, you can jump to 1:21:30 in the video.

The answer also ties in nicely with my Linkedin post on '5G: Mine is bigger than yours'. 

Interesting gadgets from CES 2016

Here are some gadgets from the recently concluded Consumer Electronics Show (CES) 2016. These are all collected from the tweets and there is a Youtube video below if you are interested. There are just too many interesting things to list but do let me know which ones are your favourites.

5G Spectrum Discussions

While most people are looking at 5G from the point of new technologies, innovative use cases and even lumping everything under sun as part of 5G, many are unaware of the importance of spectrum and the recently concluded ITU World Radio Conference 2015 (WRC-15).

As can be seen in the picture above, quite a few bands above 24GHz were identified for 5G. Some of these bands have an already existing allocation for mobile service on primary basis. What this means is that mobile services can be deployed in these bands. For 3G and 4G, the spectrum used was in bands below 4GHz, with 1800MHz being the most popular band. Hence there was never a worry for those high frequency bands being used for mobile communication.

As these bands have now been selected for study by ITU, 5G in these bands cannot be deployed until after WRC-19, where the results of these studies will be presented. There is a small problem though. Some of the bands that were initially proposed for 5G, are not included in this list of bands to be studied. This means that there is a possibility that some of the proponent countries can go ahead and deploy 5G in those bands.

For three bands that do not already have mobile services as primary allocation, additional effort will be required to have mobile as primary allocation for them. This is assuming that no problems are identified as a result of studies going to be conducted for feasibility of these bands for 5G.

To see real benefits of 5G, an operator would need to use a combination of low and high frequency bands as can be seen in the picture above. Low frequencies for coverage and high frequencies for capacity and higher data rates.


As I mentioned in an earlier blog post, 5G will be coming in two phases. Phase 1 will be Rel-15 in H2, 2018 and Phase 2, Rel-16, in Dec. 2019. Phase 1 of 5G will generally consist of deployment in lower frequency bands as the higher frequency bands will probably get an approval after WRC-19. Once these new bands have been cleared for 5G deployment, Phase 2 of 5G would be ready for deployment of these high frequency bands.

This also brings us to the point that 5G phase 1 wont be significantly different from LTE-A Pro (or 4.5G). It may be slightly faster and maybe a little bit more efficient.

One thing I suspect that will happen is start of switching off of 3G networks. The most commonly used 3G (UMTS) frequency is 2100MHz (or 2.1GHz). If a network has to keep some 3G network running, it will generally be this frequency. This will also allow other international users to roam onto that network. All other 3G frequencies would soon start migrating to 4G or maybe even 5G phase 1.

Anyway, 2 interesting presentations on 5G access and Future of mmWave spectrum are embedded below. They are both available to download from the UK Spectrum Policy Forum (SPF) notes page here.

Further reading:

• WRC-2015 and the impossible task of achieving a delicate balance

End to end and top to bottom network design…

A good way to start 2016 is by a lecture delivered by Andy Sutton, EE at the IET conference 'Towards 5G Mobile Technology – Vision to Reality'. The slides and the video are both embedded below. The video also contains Q&A at the end which people may find useful.

Videos of all other presentations from the conference are available here for anyone interested.

Top 10 posts for 2015

Here are the top 10 posts for 2015:

1. Voice over WiFi (VoWiFi) technical details
2. LTE-Hetnet (LTE-H) a.k.a. LTE Wi-Fi Link Aggregation (LWA)
3. New LTE UE Categories: 11, 12, 13 and 14 in 3GPP Rel-12
4. LTE Category-0 low power M2M devices
5. VoLTE Roaming: LBO, S8HR or HBO
6. M2M embedded UICC (eSIM) Architecture and Use Cases
7. The path from 4.5G to 5G
8. Quick Summary of LTE Voice Summit 2015 (#LTEVoice)
9. 5G and Evolution of the Inter-connected Network
10. Cellular IoT (CIoT) or LoRa?

Its interesting to see that Voice (VoLTE, VoWiFi, etc.) and M2M dominated most of the searches followed by 5G

ADS-B to enable global flight tracking

One of the things that the World Radio Conference 2015 (WRC-15) enabled was to provide a universal spectrum allocation for flight tracking. What this means in simple terms is that once completely implemented, flights will hopefully no longer be lost, like MH370. It will now be possible to accurately track flights with satellites across nearly 100% of the globe, up from 30% today, by 2018.

To make you better understand this, see this video below:


Automatic Dependent Surveillance (ADS) is a surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position-fixing systems, including aircraft identification, four-dimensional position and additional data as appropriate. ADS data is displayed to the controller on a screen that replicates a radar screen. ICAO Doc 4444 PANS-ATM notes that air traffic control service, may be predicated on the use of ADS provided that identification of the aircraft involved is unambiguously established. Two main versions of ADS are currently in use:

• Automatic Dependent Surveillance-Broadcast (ADS-B) is a function on an aircraft or surface vehicle that broadcasts position, altitude, vector and other information for use by other aircraft, vehicles and by ground facilities. It has become the main application of the ADS principle.
• Automatic Dependent Surveillance-Contract (ADS-C) functions similarly to ADS-B but the data is transmitted based on an explicit contract between an ANSP and an aircraft. This contract may be a demand contract, a periodic contract, an event contract and/or an emergency contract. ADS-C is most often employed in the provision of ATS over transcontinental or transoceanic areas which see relatively low traffic levels. 

The ITU press release on this topic:

The frequency band 1087.7-1092.3 MHz has been allocated to the aeronautical mobile-satellite service (Earth-to-space) for reception by space stations of Automatic Dependent Surveillance-Broadcast (ADS-B) emissions from aircraft transmitters.

The frequency band 1087.7-1092.3 MHz is currently being utilized for the transmission of ADS-B signals from aircraft to terrestrial stations within line-of-sight. The World Radiocommunication Conference (WRC-15) has now allocated this frequency band in the Earth-to-space direction to enable transmissions from aircraft to satellites. This extends ADS-B signals beyond line-of-sight to facilitate reporting the position of aircraft equipped with ADS-B anywhere in the world, including oceanic, polar and other remote areas.

WRC-15 recognized that as the standards and recommended practices (SARP) for systems enabling position determination and tracking of aircraft are developed by the International Civil Aviation Organization (ICAO), the performance criteria for satellite reception of ADS-B signals will also need to be addressed by ICAO.

This agreement follows the disappearance and tragic loss of Malaysian Airlines Flight MH370 in March 2014 with 239 people on board, which spurred worldwide discussions on global flight tracking and the need for coordinated action by ITU and other relevant organizations.

For more details see: globalflightsafety.org

LTE-Advanced Pro (a.k.a. 4.5G)

3GPP announced back in October that the next evolution of the 3GPP LTE standards will be known as LTE-Advanced Pro. I am sure this will be shortened to LTE-AP in presentations and discussions but should not be confused with access points.

3GPP Approves LTE-Advanced Pro as New Marker for LTE Evolution System (4.5G) - https://t.co/J3H7lhqAeZ pic.twitter.com/rQmAeooQqd

— Zahid Ghadialy (@zahidtg) October 28, 2015

The 3GPP press release mentioned the following:

LTE-Advanced Pro will allow mobile standards users to associate various new features – from the Release’s freeze in March 2016 – with a distinctive marker that evolves the LTE and LTE-Advanced technology series.

The new term is intended to mark the point in time where the LTE platform has been dramatically enhanced to address new markets as well as adding functionality to improve efficiency.

The major advances achieved with the completion of Release 13 include: MTC enhancements, public safety features – such as D2D and ProSe - small cell dual-connectivity and architecture, carrier aggregation enhancements, interworking with Wi-Fi, licensed assisted access (at 5 GHz), 3D/FD-MIMO, indoor positioning, single cell-point to multi-point and work on latency reduction. Many of these features were started in previous Releases, but will become mature in Release 13.

LTE-evolution timelinea 350pxAs well as sign-posting the achievements to date, the introduction of this new marker confirms the need for LTE enhancements to continue along their distinctive development track, in parallel to the future proposals for the 5G era.

Some vendors have been exploring ways of differentiating the advanced features of Release-13 and have been using the term 4.5G. While 3GPP does not officially support 4.5G (or even 4G) terminology, a new term has been welcomed by operators and vendors alike.

I blogged about Release-13 before, here, which includes a 3GPP presentation and 4G Americas whitepaper. Recently Nokia (Networks) released a short and sweet video and a whitepaper. Both are embedded below:

The Nokia whitepaper (table of contents below) can be downloaded from here.

ITU Workshop on VoLTE and ViLTE Interoperability

ITU recently held a workshop on "Voice and Video Services Interoperability Over Fixed-Mobile Hybrid Environments,Including IMT-Advanced (LTE)" in Geneva, Switzerland on 1st December 2015.

The following is the summary of that workshop:

I also like this presentation by R&S:

All the presentations from the workshop are available online from ITU website here.

Mobility challenges in Future Cities

I got an opportunity this week to attend an interesting 'Sir Henry Royce Memorial Lecture 2015' organised by The IET. The topic of the presentation was "Mobility for the 21st Century".

Professor John Miles reflected upon the reasons why the car dominates our urban environments and explored the challenges of freeing our cities from the log-jam of traffic congestion and associated pollution which currently seems inevitable. He proposition that, to be successful, future public transport and shared ridership systems must simply represent a better journey option than taking the car. The question is, as engineers, how we might meet this challenge and deliver success in the coming decades?

Some reactions from twitter:

Doesn’t make sense to kick people out of cars but to offer public transport systems that are _simply the best_ – Prof John Miles #IETroyce

— Nico Macdonald (@Nico_Macdonald) December 1, 2015

Idle capacity is the reason why public transportation emissions are not much better than cars... #IETroyce pic.twitter.com/Apr5IJsi9i

— Maria Shiao (@mariashiao) December 1, 2015

This is the scalable bus : minimises parasitic mass! #IETroyce pic.twitter.com/k5hZ7dSAFu

— Maria Shiao (@mariashiao) December 1, 2015

Anyway, the video of the presentation is as follows:





Related news:

• Could Driverless cars be heading to Cambridge thanks to UK Autodrive project?

5G, NFV and Network Slicing

5G networks have multifaceted requirements where the network needs to be optimised for data rate, delay and connection numbers. While some industry analysts suspect that these requirements cannot be met by a single network, vendors suggest that Network Slicing will allow all these requirements to be met by a single network.

Ericsson's whitepaper provides a good definition of what network slicing means:

A logical instantiation of a network is often called a network slice. Network slices are possible to create with both legacy platforms and network functions, but virtualization technologies substantially lower barriers to using the technology, for example through increased flexibility and decreased costs.

...

Another aspect of management and network slicing is setting up separate management domains for different network slices. This may allow for completely separate management of different parts of the network that are used for different purposes. Examples of use cases include mobile virtual network operators (MVNOs) and enterprise solutions. This kind of network slice would, in current Evolved Packet Core (EPC) networks, only cover the PDN gateway (PGW) and the policy control resource function (PCRF). However, for machine type communication (MTC) and machine-tomachine (M2M) solutions, it is likely that it would also cover the Mobile Management Entities (MMEs) and Serving Gateways (SGWs).

NGMN came out with the 5G whitepaper which touched on this subject too: 

Figure above illustrates an example of multiple 5G slices concurrently operated on the same infrastructure. For example, a 5G slice for typical smartphone use can be realized by setting fully-fledged functions distributed across the network. Security, reliability and latency will be critical for a 5G slice supporting automotive use case. For such a slice, all the necessary (and potentially dedicated) functions can be instantiated at the cloud edge node, including the necessary vertical application due to latency constraints. To allow on-boarding of such a vertical application on a cloud node, sufficient open interfaces should be defined. For a 5G slice supporting massive machine type devices (e.g., sensors), some basic C-plane functions can be configured, omitting e.g., any mobility functions, with contentionbased resources for the access. There could be other dedicated slices operating in parallel, as well as a generic slice providing basic best-effort connectivity, to cope with unknown use cases and traffic. Irrespective of the slices to be supported by the network, the 5G network should contain functionality that ensures controlled and secure operation of the network end-to-end and at any circumstance.

Netmanias has a detailed article on this topic which is quite interesting too, its available here.

Recently, South Korean operator SK Telecom and Ericsson concluded a successful trial of this technology, see here. Ericsson is also working with NTT Docomo on 5G including network slicing, see here.