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Articles on this Page
- 02/15/15--10:50: _5G and NFV
- 02/23/15--05:00: _Static/Dynamic IP A...
- 03/01/15--02:24: _3G vs 4G Power cons...
- 03/08/15--14:10: _LTE Category-0 low ...
- 03/15/15--05:07: _Air-Ground-Air comm...
- 03/28/15--08:13: _Report on Spectrum ...
- 04/03/15--04:34: _Some interesting Ap...
- 04/12/15--07:37: _LTE-Hetnet (LTE-H) ...
- 04/19/15--04:39: _3GPP Release-13 wor...
- 04/25/15--10:03: _Mobile Telecoms Tec...
- 05/04/15--03:59: _New LTE UE Categori...
- 05/10/15--07:25: _LTE-Broadcast makin...
- 05/16/15--06:49: _Smart Homes of the ...
- 05/23/15--12:01: _The path from 4.5G ...
- 05/30/15--03:50: _'5G' talks from Joh...
- 06/03/15--12:52: _'The Future Inter-c...
- 06/07/15--08:35: _Nuggets from Ericss...
- 06/14/15--08:21: _Using 8T8R Antennas...
- 06/16/15--12:49: _Have researchers mo...
- 06/21/15--09:27: _Broadband Access vi...
- 02/15/15--10:50: 5G and NFV
- 02/23/15--05:00: Static/Dynamic IP Address Allocation in LTE
- 03/01/15--02:24: 3G vs 4G Power consumption
- Why LTE sucks (your battery, that is) - Gigaom
- Comparing LTE and 3G Energy Consumption
- Envelope Tracking for improving PA efficiency of mobile devices
- 03/08/15--14:10: LTE Category-0 low power M2M devices
- 03/15/15--05:07: Air-Ground-Air communications in Mission Critical scenarios
- Air-to-Ground communications can be provided using the LTE standards (rel-8 and beyond depending on the targeted scenarios).
- 3GPP UE RF requirements might need to be adapted
- It may be possible to enhance the performance of the communications with some standards changes, but these are in most cases expected to be non-fundamental optimizations
- Engineering and implementation adaptations are required depending on the deployment scenario. In particular, the ECC report  comments that from implementation point of view synchronization algorithms are to be modified compared to terrestrial mobile radio usage in order to cope with high Doppler frequency shift of the targeted scenario. In addition, some network management adaptations might be needed. From engineering perspective the Ground base station antenna adjustment has to be matched to cover indicated aircraft heights above ground up to 12 km by antenna up-tilt. It is also expected that the inter-site distances would be dominated by the altitudes to be supported .
- A2G technology using legacy LTE has been studied and successfully trialed covering different kinds of services: Surfing, downloading, e-mail transmission, use of Skype video, audio applications and Video conferencing. Related results can be found in several documents from ECC and from companies , , . The trials in  and  assumed in general a dedicated spectrum, and the fact that the communications in the aircraft cabin are using WIFI or GSMOBA standards, while LTE is used for the Broadband Direct-Air-to-Ground connection between the Aircraft station and the Ground base station.
- It is understood that it is possible to operate A2G communications over spectrum that is shared with ground communications. However, due to interference it is expected that the ground communications would suffer from capacity losses depending on the deployment scenario. Therefore, it is recommended to operate A2G communication over a dedicated spectrum.
- It can be noted that ETSI studies concluded that Spectrum above 6 GHz is not appropriate for such applications .
- LTE already provides solutions to allow seamless mobility in between cells. Cells can be intended for terrestrial UEs and cells intended for A2G UEs which might operate in different frequencies.
- Cell range in LTE is limited by the maximum timing advance (around 100km). Larger ranges could be made possible by means of implementation adaptations.
- 03/28/15--08:13: Report on Spectrum Usage and Demand in the UK
- 04/03/15--04:34: Some interesting April Fools' Day 2015 Technology Jokes
- 04/12/15--07:37: LTE-Hetnet (LTE-H) a.k.a. LTE Wi-Fi Link Aggregation (LWA)
- 04/19/15--04:39: 3GPP Release-13 work started in earnest
- LTE in unlicensed spectrum (aka Licensed-Assisted Access) - RP-150055
- Carrier Aggregation enhancements - RP-142286
- LTE enhancements for Machine-Type Communications (MTC) - RP-141865
- Enhancements for D2D - RP-142311
- Study Item Elevation Beamforming / Full-Dimension MIMO - RP-141831
- Study Item Enhanced multi-user transmission techniques - RP-142315
- Study Item Indoor positioning - RP-141102
- Study Item Single-cell Point-to-Multipoint (SC-PTM) - RP-142205
- LTE Category-0 low power M2M devices
- Update on Public Safety and Mission Critical communications
- 3GPP Rel-12 and Future Security Work
- Elevation Beamforming / Full-Dimension MIMO
- LA-LTE and LAA
- LTE-Hetnet (LTE-H) a.k.a. LTE Wi-Fi Link Aggregation (LWA)
- 04/25/15--10:03: Mobile Telecoms Technology & Market Disruptions
- 05/04/15--03:59: New LTE UE Categories: 11, 12, 13 and 14 in 3GPP Rel-12
- LTE Category-0 low power M2M devices
- New LTE-A UE Category 9 and 10 in Rel-11
- LTE-Advanced (Rel-10) UE Categories
- 1200Mbps DL with LTE-Advanced
- 05/16/15--06:49: Smart Homes of the Future and Technologies
- 05/23/15--12:01: The path from 4.5G to 5G
- 05/30/15--03:50: '5G' talks from Johannesburg Summit 2015
- 06/07/15--08:35: Nuggets from Ericsson Mobility Report
- 06/14/15--08:21: Using 8T8R Antennas for TD-LTE
- 06/16/15--12:49: Have researchers moved on past 5G on to 6G Wireless?
- 06/21/15--09:27: Broadband Access via Integrated Terrestrial & Satellite Systems
Tieto gave an interesting presentation in our last Small Cell SIG event explaining how the network will be implemented based on NFV. The presentation is embedded below:
There is also an interesting paper that expands on this further, available from Slideshare here.
I recently came across a discussion on how static and dynamic IP address are allocated in LTE for a UE. Luckily, there is a recent document from Netmanias that discussed this topic. The document is embedded below.
If you enjoyed reading the document (part 1) above, then there is a part 2 here. While in part 1, we saw that IP addresses can be either dynamic or static depending on their allocators, part 2 presents a specific case of IP address allocation – allocation in geographically-separated locations within an LTE network. In case of dynamic allocation, no matter where a user accesses, a dynamically selected P-GW dynamically allocates an IP address to the user for PDN connection. In case of static allocation, however, there is always one specific P-GW and one IP address for a user - the designated P-GW allocates a static IP address for the user’s PDN connection. A case study shows an LTE network that serves two cities as an example to describe different ways and procedures of IP address allocation, and see how they are different from each other.
While we have talked about different LTE categories, especially higher speeds, we have not yet discussed Category-0 or Cat-0 for M2M.
A recent news report stated the following:
Ericsson has an interesting presentation that talks about LTE evolution for cellular IoT. While Rel-12 Cat-0 would use the normal allocated bandwidth (upto 20MHz), Rel-13 plans further enhancements to save even more power by reducing the bandwidth to 1.4Mhz. Another possible saving of power comes from the use of Half Duplex (but its optional). There is a very interesting presentation from Mstar semiconductors on half duplex that I have blogged about here. Anyway, the presentation from Ericsson is here:
When we talk about 50 billion M2M devices, a question that I regularly ask is how many of them will be using cellular and how many will use other technologies. Its good to see that my skepticism is shared by others as well, see the tweet below.
@disruptivedean@ericsson Re 2% only cellular, I was discussing this the other day. Too many competing techs. pic.twitter.com/Z7s6wqxkBMClick on the pic.twitter.com/Z7s6wqxkBM to see the actual media.
— Zahid Ghadialy (@zahidtg) January 26, 2015
Some of you may remember that couple of years back Ericsson showed an example of using LTE in extreme conditions. The video below shows that LTE can work in these scenarios.
Now there are various acronyms being used for these type of communications but the one most commonly used is Direct-Air-to-Ground Communications (DA2GC), Air-to-Ground (A2G) and Ground-to-Air (G2A).
While for short distance communications, LTE or any cellular technology (see my post on Flying Small Cells) may be a good option, a complete solution including communication over sea would require satellite connectivity as well. As I have mentioned in a blog post before, 75Mbps connectivity would soon be possible with satellites.
For those interested in working of the Air-Ground-Air communications, would find the presentation below useful. A much detailed ECC CEPT report from last year is available here.
The next challenge is to explore whether LTE can be used for Mission Critical Air Ground Air communications. 3GPP TSG RAN recently conducted study on the feasibility and the conclusions are as follows:
Last week at work, we released a report titled "UK Spectrum Usage & Demand". The only time most people hear about spectrum is when there are some auctions going on. Often a small chunk of spectrum gets sold off for billion(s) of dollars/pounds and these surely make a headline. As I recently found out, 50% of spectrum in UK is shared and 25% is license exempt.
Anyway, this first edition of the report focuses on Public Mobile, Utilities, Business Radio and Space/Satellites. Space is becoming an important area of focus here as it is a significant contributor to the UK economy.
Anyway, the report is embedded below and is available to download from here:
Samsung Galaxy Blade Edge - Chef's edition
Selfie Shoes by Miz Mooz - Shoefie
com.google - You can try it in chrome browser, it was working
We're always looking ahead, but sometimes it's important to reflect. Change your perspective: http://t.co/oTkpNeurqjpic.twitter.com/4RDyBgjSES
— Google (@google) April 1, 2015
Smartbox by Inbox: the mailbox of tomorrow, today - by Google
HTC Re-Sok - the "world's first truly smart sock"
Bing's Palm Search technology
Introducing #MotoSelfieStick - By Motorola
Twitter’s Twelfie Stick
Domino’s Domi-No-Driver Service
The #DomiNoDriver spotted out and about delivering Greatness on-the-go! Visit http://t.co/TdlR2vKVK8. https://t.co/e4mJA2QDWZIltasanomat news on April 1st 2015 (source not available): Finnish Police is having their own air forces with 250 seagulls with TETRA radio and camera
— Domino's Pizza UK (@Dominos_UK) April 1, 2015
And finally, these old style pranks still work :-)
RT @ValaAfshar: So many people are falling for this :D #AprilFools - via @paulcoxonpic.twitter.com/gMde1IHoLC
— Benjamin Robbins (@PaladorBenjamin) April 1, 2015
If you like them, you will enjoy the last year ones too. Here.
There is a lot of unease in the WiFi camp because LTE-LAA may hog the 5GHz spectrum that is available as license-exempt for use of Wi-Fi and other similar (future) technologies. Even though LAA may be more efficient as claimed by some vendors, it would reduce the usage for WiFi users in that particular spectrum.
As a result, some vendors have recently proposed LTE/WiFi Link Aggregation as a new feature in Release-13. Alcatel-Lucent, Ruckus Wireless and Qualcomm have all been promoting this. In fact Qualcomm has a pre-MWC teaser video on Youtube. The demo video is embedded as follows:
The Korean operator KT was also involved in demoing this in MWC along with Samsung and Qualcomm. They have termed this feature as LTE-Hetnet or LTE-H.
The Korean analyst firm Netmanias have more detailed technical info on this topic.
As can be seen the data is split/combined in PDCP layer. While this example above shows the practical implementation using C-RAN with Remote Radio Head (RRH) and BaseBand Unit (BBU) being used, the picture at the top shows LTE Anchor in eNodeB. There would be a need for an ideal backhaul to keep latency in the eNodeB to minimum when combining cellular and WiFi data.
The above table shows comparison between the 3 main techniques for increasing data rates through aggregation; CA, LTE-U/LAA and LTE-H/LWA. While CA has been part of 3GPP Release-10 and is available in more of less all new LTE devices, LTE-U and LTE-H is new and would need modifications in the network as well as in the devices. LTE-H would in the end provide similar benefits to LTE-U but is a safer option from devices and spectrum point of view and would be a more agreeable solution by everyone, including the WiFi community.
A final word; last year we wrote a whitepaper laying out our vision of what 4.5G is. I think we put it simply that in 4.5G, you can use WiFi and LTE at the same time. I think LTE-H fulfills that vision much better than other proposals.
The 3GPP news from some months back listed the main RAN features that have been approved for Release-13 and the work has already started on them. The following are the main features (links contain .zip files):
Another 3GPP presentation from late last year showed the system features that were being planned for Rel-13 as shown above.
I have also posted a few items earlier relating to Release13, as follows:
Ericsson has this week published a whitepaper on release 13, with a vision for 'Networked Society':
The vision of the Networked Society, where everything that benefits from being connected will be connected, places new requirements on connectivity. LTE is a key component in meeting these demands, and LTE release 13 is the next step in the LTE evolution.Their whitepaper embedded below:
It should be pointed out that 5G work does not start until Release-15 as can be seen from my tweet
Nice picture of "5G Radio Interface development timeline" by @alainmouradUKpic.twitter.com/ANFfujJGS5
— Zahid Ghadialy (@zahidtg) April 4, 2015
Embedded below is a presentation from Dean Bubley of Disruptive Analysis. While there are a few things that I look at differently, there are many interesting points that the industry should already be looking at.
A good example of disruption would be the SIM card evolution that Apple introduced in iPadAir2 and iPadMini3. While they had great expectations, it didnt work out exactly as they had hoped due to the operators not letting Apple use the feature they wanted. In fact John Legere, T-Mobile US CEO, took to twitter to explain the problem. See here.
Another example is the new MVNO model by Google (Fi) in the USA. The problem in USA compared to Europe is that the operators have monopoly in many areas (fixed and mobile) and they can also get away with charging far higher amounts.
In addition, the problem that the operators have is that they focus on areas where they don't have issues; crying wolf if required. An example is taking advantage of 'data tsunami' and using it to hoard spectrum, as be seen from the tweet below:
Verizon Wireless admits to hoarding spectrum, ends any argument about a spectrum crunch http://t.co/0aqpGxlEvm
— Kevin Ahoy (@FlightsimGeek) February 23, 2015
Anyway, here is the presentation. Let me know what you think.
The LG Space page has some more details for anyone interested in exploring further.
A Qualcomm demo from MWC for LTE Category 11, if interested.
Finally, other related posts:
"TV isn't dying, it's having babies." This quote made my day. I have argued a few times in the past that terrestrial broadcasting will continue working and will be probably the most popular approach for a long time to come. The way things work with it may change. Multi-screen is one possible approach but you may have more interactions like 'red button functionality', etc.
Lamy report. The other UHF band from 470MHz to 694MHz would be left as it is until 2030, with a review planned in 2025.
This has forced even big players like BBC to start looking at other mechanisms to deliver TV. While BBC3 was moved to online only, BBC is also exploring how to use LTE-Multicast to deliver content. It has been working to have its very popular iPlayer work with eMBMS.
Embedded below is a presentation from Cambridge Wireless CWTEC 2015 conference.
eMBMS is gaining popularity with its presence in lot more chipsets and even more trials. GSA report has shown that there are quite a few trials going on worldwide but the question remains about the business models. Most operators would not like to become content providers and compete with the incumbents in their markets. Having someone like BBC in the UK is helpful but not sure how many such options are available worldwide. Embedded below is the GSA presentation
There were some nice pictures from MWC as can be seen above. Ericsson has a video as well (below) on how the app works.Great LTE Broadcast demo by @Ericsson using devices from Samsung & LG powered by Qualcomm. Consumers will love this. pic.twitter.com/1uroaV3mk9— Ben Wood (@benwood) March 5, 2015
M2M LTE Broadcast module fm D-Link / Verizon. Huge potential here for billboards, taxis or any screen U can think of! pic.twitter.com/WL2f5mZ5bB— Ben Wood (@benwood) March 5, 2015
D-Link is also working on M2M modules that could be used in billboards to dynamically update the ads at very regular intervals. There is a video here that explains this further.
Finally here is a Video from Visteon/Verizon that explains how LTE-Multicast can be used to deliver software updates in the connected car:
Finally, here are couple of presentations that may interest you too:
Saw the above picture recently on Twitter. While its great to see how connected our future homes and even cities would be, it would be interesting to see what technologies are used for connecting these devices.
Cambridge Wireless had a smart homes event last month, there were some interesting presentations that I have detailed below.
The first of these technologies discussed is LoRa. As can be seen, its billed as ultimate long range (10 mile) and low power (10 year battery lifetime) technology. It uses spread-spectrum making it robust to channel noise. Here is the presentation:
The next technology is Zigbee 3.0. According to Zigbee Alliance:
The new standard unifies ZigBee standards found in tens of millions of devices delivering benefits to consumers today. The ZigBee 3.0 standard enables communication and interoperability among devices for home automation, connected lighting, energy efficiency and other markets so more diverse, fully interoperable solutions can be delivered by product developers and service providers. All device types, commands, and functionality defined in current ZigBee PRO-based standards are available to developers in the new standard.
ZigBee 3.0 defines the widest range of device types including home automation, lighting, energy management, smart appliance, security, sensors, and health care monitoring products. It supports both easy-to-use DIY installations as well as professionally installed systems. Based on IEEE 802.15.4, which operates at 2.4 GHz (a frequency available for use around the world), ZigBee 3.0 uses ZigBee PRO networking to enable reliable communication in the smallest, lowest-power devices. Current ZigBee Certified products based on ZigBee Home Automation and ZigBee Light Link are interoperable with ZigBee 3.0. A complete list of standards that have been merged to create ZigBee 3.0 can be seen on the website at www.ZigBee.org.
“The ZigBee Alliance has always believed that true interoperability comes from standardization at all levels of the network, especially the application level which most closely touches the user,” said Tobin J. M. Richardson, President and CEO of the ZigBee Alliance. “Lessons learned by Alliance members when taking products to market around the world have allowed us to unify our application standards into a single standard. ZigBee 3.0 will allow product developers to take advantage of ZigBee’s unique features such as mesh networking and Green Power to deliver highly reliable, secure, low-power, low-cost solutions to any market.”
Finally, we have Bluetooth Smart mesh.
CSRmesh enables Bluetooth® low energy devices not only to receive and act upon messages, but also to repeat those messages to surrounding devices thus extending the range of Bluetooth Smart and turning it into a mesh network for the Internet of Things.
While the CW event was not able to discuss all possible technologies (and believe me there are loads of them), there are other popular contenders. Cellular IoT (CIoT) is one if them. I have blogged about the LTE Cat-0 here and 5G here.
A new IEEE Wi-Fi standard 802.11ah using the 900MHz band has been in works and will solve the need of connectivity for a large number of things over long distances. A typical 802.11ah access point could associate more than 8,000 devices within a range of 1 km, making it ideal for areas with a high concentration of things. The Wi-Fi Alliance is committed to getting this standard ratified soon. With this, Wi-Fi has the potential to become a ubiquitous standard for IoT. See also this article by Frank Rayal on this topic.
Finally, there is SIGFOX. According to their website:
SIGFOX uses a UNB (Ultra Narrow Band) based radio technology to connect devices to its global network. The use of UNB is key to providing a scalable, high-capacity network, with very low energy consumption, while maintaining a simple and easy to rollout star-based cell infrastructure.
The network operates in the globally available ISM bands (license-free frequency bands) and co-exists in these frequencies with other radio technologies, but without any risk of collisions or capacity problems. SIGFOX currently uses the most popular European ISM band on 868MHz (as defined by ETSI and CEPT) as well as the 902MHz in the USA (as defined by the FCC), depending on specific regional regulations.
Communication on SIGFOX is secured in many ways, including anti-replay, message scrambling, sequencing, etc. The most important aspect of transmission security is however that only the device vendors understand the actual data exchanged between the device and the IT systems. SIGFOX only acts as a transport channel, pushing the data towards the customer's IT system.
An important advantage provided by the use of the narrow band technology is the flexibility it offers in terms of antenna design. On the network infrastructure end it allows the use of small and simple antennas, but more importantly, it allows devices to use inexpensive and easily customizable antennas.
Sigfox is also working on project Mustang, a three-year effort to build a hybrid satellite/terrestrial IoT (internet of things) network. According to Rethink Research:
The all-French group also contains aerospace firm Airbus, research institute CEA-Leti and engineering business Sysmeca. The idea is to use Sigfox as the terrestrial data link, with satellite backhaul and connections to planes and boats provided by a low-earth orbit (LEO) satellite constellation.
The satellite link could be added to either the end devices or the base station, so that if a device was unable to connect to the terrestrial Sigfox network, it could fall back to the satellite.
While the power requirements for this would be prohibitive for ultra-low power, battery-operated devices, for those with a wired power supply and critical availability requirements (such as smart meters, alarms, oil tankers and rigs) the redundancy would be an asset. These devices may transmit small amounts of data but when they do need to communicate, the signal must be assured.
The Sigfox base station could be fitted with a satellite uplink as a primary uplink as well as a redundancy measure in some scenarios where terrestrial network reach cannot be achieved. With a three-year lifecycle, Mustang’s participants are looking to create a seamless global network, and note that the planned dual-mode terrestrial/satellite terminal will enable switching between the two channels in response to resource availability.
The group says that the development of this terminal modem chipset is a priority, with later optimization of the communication protocols being the next step before an application demonstration using an airplane.
The project adds that the full potential of the IoT can only be achieved by offering affordable mobile communications at a global scale and reach. Key to this is adapting existing networks, according to the group, which explains why Sigfox has been chosen – given that the company stresses the affordability of its system.
According to this presentation, 3GPP is looking to create a new brand from Release-13 that will supersede LTE-Advanced (LTE-A). Some of you may remember that the vendor/operator community tried this in the past by introducing LTE-B, LTE-C, etc. for the upcoming releases but they were slapped down by 3GPP. Huawei is calling this Release-13 as 4.5G but it would be re-branded based on what 3GPP comes up with.
Another interesting point are the data rates achieved in the labs, probably more than others. 10.32Gbps in sub-6GHz in a 200MHz bandwidth and 115.20Gbps using a 9.6GHz bandwidth in above 6GHz spectrum. The complete presentation as follows:
Cambridge Wireless Small Cells SIG event back in February by Egon Schulz. The presentation is embedded below but I want to highlight the different waveforms that being being looked at for 5G. In fact if someone has a list of the waveforms, please feel free to add it in comments
The above tweet from a recent IEEE event in Bangalore is another example of showing the research challenges in 5G, including the waveforms. The ones that I can obviously see from above is: FBMC, UFMC, GFDM, NOMA, SCMA, OFDM-opt, f-OFDM.
The presentation as follows:
The annual Johannesburg Summit took place May 10th-12th 2015. While it seems like there is a 5G related event every week, most of the events focus on different themes, use cases, applications and possibilities.
While there were some quite futuristic grand visions, there were a few technical presentations that would be a treat to the audience of this blog. I would especially recommend the presentations from Qualcomm and Samsung. Here is a video of all the presentations:
Some of the presentations from this summit, in PDF format are available here.
I had the pleasure of doing a keynote at PhaseReady 2015 in London today. My presentation is embedded below along with some comments, followed by tweets some of which I think are important to think about. Finally, I have embedded a video by EE and Light Reading which was quoted and maybe its important in the context of this event.
An example of today's networks are like driving a manual car where we have to change gears depending on the traffic, speed required and fuel efficiency. Automatic cars are supposed to optimise this and achieve the best in all different cases. The future inter-connected networks should achieve the best based on the requirements in all different scenarios.
While it is easy to say this in theory, the practical networks will have many challenges to solve, including business and/or technical. The theme of the conference was timing, frequency and phase synchronisation. There are already challenges around them today, with the advanced LTE-A features. These challenges are only going to get bigger.
The following are the tweets from the day:
Finally, here is the link to video referred to in the last tweet. Its from last year but well worth listening.
Ericsson mobility report 2015 was released last week. Its interesting to see quite a few of these stats on devices, traffic, usage, etc. is getting released around this time. All of these reports are full of useful information and in the old days when I used to work as an analyst, I would spend hours trying to dig into them to find gold. Anyway, some interesting things as follows and report at the end.
The above chart, as expected, data will keep growing but voice will get flatter and maybe go down, if people start moving to VoIP
Application volume shares, based on the data plan. This is interesting. If you are a heavy user, you may be watching a lot of videos and if you are a light user then you are watching just a few of them.Interesting chart showing the breakdown of usage from heavy mobile data users to light mobile data users. pic.twitter.com/ew2Z0rWzlZ— Ben Bajarin (@BenBajarin) June 3, 2015
How about device sizes, does our behaviour change based on the screen size?Good chart looking at how device screen size impacts certain mobile tasks more than others. Video mainly. pic.twitter.com/DcuS1rJway— Ben Bajarin (@BenBajarin) June 3, 2015
What about the 50 Billion connected devices, was it too much? Is the real figure more like 28 billion?ICYMI: #Ericsson appears to backtrack on 50B connected device vision http://t.co/uLS63BQJ9C#MobilityReport#IoT#M2Mpic.twitter.com/YARPqjxpYI— Mobile World Live (@mobileworldlive) June 3, 2015
Anyway, the report is embedded below.
People often ask at various conferences if TD-LTE is a fad or is it something that will continue to exist along with the FDD networks. TDD networks were a bit tricky to implement in the past due to the necessity for the whole network to be time synchronised to make sure there is no interference. Also, if there was another TDD network in an adjacent band, it would have to be time synchronised with the first network too. In the areas bordering another country where they might have had their own TDD network in this band, it would have to be time synchronised too. This complexity meant that most networks were happy to live with FDD networks.
In 5G networks, at higher frequencies it would also make much more sense to use TDD to estimate the channel accurately. This is because the same channel would be used in downlink and uplink so the downlink channel can be estimated accurately based on the uplink channel condition. Due to small transmit time intervals (TTI's), these channel condition estimation would be quite good. Another advantage of this is that the beam could be formed and directed exactly at the user and it would appear as a null to other users.
This is where 8T8R or 8 Transmit and 8 Receive antennas in the base station can help. The more the antennas, the better and narrower the beam they can create. This can help send more energy to users at the cell edge and hence provide better and more reliable coverage there.
How to these antennas look like. I found the above picture on antenna specialist Quintel's page here. China Mobile and Huawei have claimed to be the first ones to deploy these 8T8R antennas. Sprint, USA is another network that has been actively deploying these 8T8R antennas. There are couple of interesting tweets that show their kit below:
Sprint's John Saw showing of TD-LTE 8T8R and Network Vision. Room for expansion. pic.twitter.com/Mydzasg3F6— Walt Piecyk (@WaltBTIG) June 23, 2014
In fact Sprint has very ambitious plans. The following is from a report in Fierce Wireless:Sprint's 8T8R antenna (on left) is actually smaller than 4T2R on 1.9 GHz and 1T2R for 800MHz.(on right) #tdlte$Spic.twitter.com/q26IhZmDie— Walt Piecyk (@WaltBTIG) June 23, 2014
Sprint's deployment of 8T8R (eight-branch transmit and eight-branch receive) radios in its 2.5 GHz TDD LTE spectrum is resulting in increased data throughput as well as coverage according to a new report from Signals Research. "Thanks to TM8 [transmission mode 8] and 8T8R, we observed meaningful increases in coverage and spectral efficiency, not to mention overall device throughput," Signals said in its executive summary of the report.
The firm said it extensively tested Sprint's network in the Chicago market using Band 41 (2.5 GHz) and Band 25 (1.9 GHz) in April using Accuver's drive test tools and two Galaxy Note Edge smartphones. Signals tested TM8 vs. non-TM8 performance, Band 41 and Band 25 coverage and performance as well as 8T8R receive vs. 2T2R coverage/performance and stand-alone carrier aggregation.
Sprint has been deploying 8T8R radios in its 2.5 GHz footprint, which the company has said will allow its cell sites to send multiple data streams, achieve better signal strength and increase data throughput and coverage without requiring more bandwidth.
The company also has said it will use carrier aggregation technology to combine TD-LTE and FDD-LTE transmission across all of its spectrum bands. In its fourth quarter 2014 earnings call with investors in February, Sprint CEO Marcelo Claure said implementing carrier aggregation across all Sprint spectrum bands means Sprint eventually will be able to deploy 1900 MHz FDD-LTE for uplink and 2.5 GHz TD-LTE for downlink, and ultimately improve the coverage of 2.5 GHz LTE to levels that its 1900 MHz spectrum currently achieves. Carrier aggregation, which is the most well-known and widely used technique of the LTE Advanced standard, bonds together disparate bands of spectrum to create wider channels and produce more capacity and faster speeds.
Alcatel-Lucent has a good article in their TECHzine, an extract from that below:
Field tests on base stations equipped with beamforming and 8T8R technologies confirm the sustainability of the solution. Operators can make the most of transmission (Tx) and receiving (Rx) diversity by adding in Tx and Rx paths at the eNodeB level, and beamforming delivers a direct impact on uplink and downlink performance at the cell edge.
By using 8 receiver paths instead of 2, cell range is increased by a factor of 1.5 – and this difference is emphasized by the fact that the number of sites needed is reduced by nearly 50 per cent. Furthermore, using the beamforming approach in transmission mode generates a specific beam per user which improves the quality of the signal received by the end-user’s device, or user equipment (UE). In fact, steering the radiated energy in a specific direction can reduce interference and improves the radio link, helping enable a better throughput. The orientation of the beam is decided by shifting the phases of the Tx paths based on signal feedback from the UE. This approach can deliver double the cell edge downlink throughput and can increase global average throughput by 65 per cent.
These types of deployments are made possible by using innovative radio heads and antenna solutions. In traditional deployments, it would require the installation of multiple remote radio heads (RRH) and multiple antennas at the site to reach the same level of performance. The use of an 8T8R RRH and a smart antenna array, comprising 4 cross-polar antennas in a radome, means an 8T8R sector deployment can be done within the same footprint as traditional systems.
Anyone interested in seeing pictures of different 8T8R antennas like the one above, see here. While this page shows Samsung's antennas, you can navigate to equipment from other vendors.
Finally, if you can provide any additional info or feel there is something incorrect, please feel free to let me know via comments below.
As I am active on multiple social networks including blogs, twitter, facebook, linkedin, etc., Its always tricky to be able to share information from one on to another. Some time back I tweeted about the 6G research that seems to have started according to an article in FT.
While I had a few retweets and interactions, I realised that its always challenging to search the tweets so I decided to add this in the blog post, always easier to look it up.While everyone is focusing on 5G, research has already started on 6G :-) http://t.co/FvxJvXaxXS via @FTpic.twitter.com/g50hYqsnrN— Zahid Ghadialy (@zahidtg) May 3, 2015
So the FT Article states that:
So why did I suddenly think about 6G? Because I have had a few discussions where the research community feel that they should focus on technologies beyond 5G, something that would be a game changer and would change the way we do communications. To be honest, new ways of communications have been found (like LED-Fi / Li-Fi ) but they have not really been ground breaking.
Do you have any ideas or suggestions, add it as comments.
Last week I attended an event in the University of Surrey that was about providing high speed connectivity to un-served and under-served areas in future. While there is no arguing that satellites are a great option for unserved areas, the underserved areas can really benefit by such initiatives.
The way this is being proposed is to have a specialised Intelligent User Gateway (IUG) that can connect to ADSL, Mobile and Satellite. The assumption is that in areas of poor conectivity, ADSL can provide 2Mbps and the mobile could do something similar, upto 8Mbps. The satellites can easily do 20Mbps.
While the satellite broadband has the advantage of high speeds, they often suffer from high latencies. ADSL on the other hand has very small latency but may not be good enough for streaming kind of applications. Mobile generally falls in between for latency and speed. Using Multipath TCP and some intelligent routing algorithms, decisions can be taken to optimise for latency and speeds.Evolution path of Satellite Broadband: 2005: 2 - 3Mbps 2010: 10 - 20 Mbps 2015: 30 - 30 Mbps 2020: roughly 100 Mbps— Zahid Ghadialy (@zahidtg) June 11, 2015
I did see some impressive demo's in the lab and it did what is says on the tin. The real challenge would be the business models. While ADSL can offer unlimited internet, both Mobile and Satellite broadband will have caps. I was told that limits could be imposed so that once the Mobile/Satellite data allowance is over, only ADSL would be used. Maybe a more complex algorithm could be implemented in future that can include cost and priority of the application/service being used.
An example would be that sometimes I want to watch some long videos over Youtube but I am happy to start buffering an hour in advance. Its not critical that I have to watch that now. I would be more than happy to save my Mobile/Satellite broadband data allowance for some other day when I need to watch things more urgently. If the end of month is coming and I have a lot of data allowance left then maybe I dont mind using the quota otherwise I will anyway lose the allowance. Its always challenging to put this intelligence in the routing decision algorithms though.
Anyway, the combined presentations are embedded below and you can download them from the BATS project page here: