5G will be a convenient but expensive alternative to the NBN


Rod Tucker, University of Melbourne

Will Australia’s National Broadband Network (NBN) face damaging competition from the upcoming 5G network? NBN Co CEO Bill Morrow thinks so.

This week, he even floated the idea of a levy on mobile broadband services, although Prime Minister Malcolm Turnbull quickly rejected the idea.

NBN Co is clearly going to have to compete with mobile broadband on an equal footing.


Read More: Like it or not, you’re getting the NBN, so what are your rights when buying internet services?


This latest episode in the NBN saga raises the question of exactly what 5G will offer broadband customers, and how it will sit alongside the fixed NBN network.

To understand how 5G could compare with the NBN, let’s examine the key differences and similarities between mobile networks and fixed-line broadband.

What is 5G?

5G stands for “5th generation mobile”. It builds upon today’s 4G mobile network technology, but promises to offer higher peak connection speeds and lower latency, or time delays.

5G’s higher connection speeds will be possible thanks to improved radio technologies, increased allocations of radio spectrum, and by using many more antenna sites or base stations than today’s networks. Each antenna will serve a smaller area, or cell.

The technical details of 5G are currently under negotiation in international standards bodies. 5G networks should be available in Australia by 2020, although regulatory changes are still needed.

Connections on 5G

In a mobile network, the user’s device (typically a smart phone) communicates with a nearby wireless base station via a radio link. All users connected to that base station share its available data capacity.

Australia’s mobile network typically provides download speeds of around 20 Mb/s. But the actual speed of connection for an individual decreases as the number of users increases. This effect is known as contention.

Anyone who has tried to upload a photo to Facebook from the Melbourne Cricket Ground will have experienced this.

Mobile base stations.
kongsky/Shutterstock

The maximum download speed of 5G networks could be more than 1 Gb/s. But in practice, it will likely provide download speeds around 100 Mb/s or higher.

Because of contention and the high cost of the infrastructure, mobile network operators also impose significant data download limits for 4G. It is not yet clear what level of data caps will apply in 5G networks.

Connections on the NBN

In a fixed-line network like the NBN, the user typically connects to the local telephone exchange via optical fibre. Directly, in the case of fibre-to-the-premises (FTTP), or by copper wiring and then fibre, in fibre-to-the-node (FTTN).

An important difference between the NBN and a mobile network is that on the NBN, there is virtually no contention on the data path between the user and the telephone exchange. In other words, the user’s experience is almost independent of how many other users are online.

But, as highlighted in the recent public debate around the NBN, some users have complained that NBN speeds decrease at peak usage times.

Importantly, this is not a fundamental issue of the NBN technology. Rather, it is caused by artificial throttling thanks to the NBN Co’s Connectivity Virtual Circuit (CVC) charges, and/or by contention in the retail service provider’s network.

Retail service providers like TPG pay CVC charges to NBN Co to gain bandwidth into the NBN. These charges are currently quite high, and this has allegedly encouraged some service providers to skimp on bandwidth, leading to contention.

A restructuring of the wholesale model as well as providing adequate bandwidth in NBN Co’s transit network could easily eliminate artificial throttling.

The amount of data allowed by retailers per month is also generally much higher on the NBN than in mobile networks. It is often unlimited.

This will always be a key difference between the NBN and 5G.

Don’t forget, 5G needs backhaul

In wireless networks, the connection between the base stations and internet is known as backhaul.

Today’s 4G networks often use microwave links for backhaul, but in 5G networks where the quantity of data to be transferred will be higher, the backhaul will necessarily be optical fibre.

In the US and elsewhere, a number of broadband service providers are planning to build 5G backhaul networks using passive optical network (PON) technology. This is the type used in the NBN’s FTTP sections.

In fact, this could be a new revenue opportunity for NBN Co. It could encourage the company to move back to FTTP in certain high-population density areas where large numbers of small-cell 5G base stations are required.

So, will 5G Compete with the NBN?

There is a great deal of excitement about the opportunities 5G will provide. But its full capacity will only be achieved through very large investments in infrastructure.

Like today’s 4G network, large data downloads for video streaming and other bandwidth-hungry applications will likely be more expensive using 5G than using the NBN.


Read More: The NBN needs subsidies if we all want to benefit from it


In addition, future upgrades to the FTTP sections of the NBN will accommodate download speeds as high as 10 Gb/s, which will not be achievable with 5G.

Unfortunately, those customers served by FTTN will not enjoy these higher speeds because of the limitations of the copper connections between the node and the premises.

The Conversation5G will provide convenient broadband access for some internet users. But as the demand for ultra-high-definition video streaming and new applications such as virtual reality grow, the NBN will remain the network of choice for most customers, especially those with FTTP services.

Rod Tucker, Laureate Emeritus Professor, University of Melbourne

This article was originally published on The Conversation. Read the original article.

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Explainer: how to extend your phone’s battery life



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Without proper care, mobile phone batteries can degrade and hold less charge.
Arthur Mustafa/Shutterstock

Jacek Jasieniak, Monash University

As mobile phone users, all we want is enough battery life to last the day. Frustratingly, the older the device, the less power it seems to have.

In fact, the amount of battery life our mobiles have on any given day depends on two key factors: how we use them on that particular day, and how we used them in the past.

Mobile phones use lithium-ion batteries for energy storage. In this type of battery, lithium metal and lithium ions move in and out of individual electrodes, causing them to physically expand and contract.


Read more: Do you know where your batteries come from?


Unfortunately, these processes are not completely reversible and the batteries lose their charge capacity and voltage as the number of charge and discharge cycles grows.

To make matters worse, the electrolyte (electrically conductive liquid) that connects the electrodes also degrades throughout these cycles.

The ability of lithium-ion batteries to store charge depends on the extent of their degradation. This means there is a link between how we handle our devices today and the charge capacity available in the future.

Through a few simple steps, users can minimise this degradation and extend their device’s life.

Lithium ion batteries are the main battery type in mobile phones.
Andy Melton/Flickr, CC BY-SA

Strategies for extending battery capacity

Control battery discharge

Typical lithium-ion batteries for mobile phones are supposed to retain 80% of their charge capacity after 300-500 charge/discharge cycles. However, batteries rarely produce this level of performance, with charge storage capacity sometimes reduced to 80% levels within only 100 cycles.

Fortunately, we can extend our future battery capacity by limiting how much we discharge our mobile phone batteries. With most battery degradation occurring during deep discharge/charge cycles, it is actually better to limit the battery discharge during any one cycle before charging it again.

As it happens, our devices do have battery-management systems, which reduce damage from overcharging and shut down automatically if the battery gets too low.

Nonetheless, to maximise the battery capacity in the future we should avoid that 0% battery mark altogether, while also keeping those batteries at least partially charged if storing them for a prolonged period of time to avoid deep discharge.

Extend charging times

Many of today’s mobile devices have a fast charge option that enables users to supercharge them in minutes rather than hours. This is convenient when we’re in a rush, but should be avoided otherwise.

Why? Because charging a battery too quickly reduces its storage capacity.

Physically, the shuttling of lithium metal and lithium ions between the electrodes in lithium-ion batteries is a slow process. Therefore, charging at lower rates allows more complete shuttling to occur, which enhances the battery’s charge capacity.

For example, charging a phone in five minutes compared with the standard two hours can reduce the battery capacity for that charge cycle by more than 20%.


Read more: How to make batteries that last (almost) forever


Keep the temperature just right

Fortunately, for most parts of the country, temperatures in Australia sit between 0℃ and 45℃ throughout the year. This is the exact range in which lithium-ion batteries can be stored to maintain optimal long-term charge capacity.

Below 0℃, the amount of power available within the battery system is reduced because of a restriction in the movement of lithium metal and lithium ions within the electrodes and through the electrolyte.

Above 45℃, the amount of power available is actually enhanced compared with lower temperatures, so you can get a little more “juice” from your battery under hotter conditions. However, at these temperatures the degradation of the battery is also greatly accelerated, so over an extended period of time its ability to store charge will be reduced.

As a result, phones should be kept out of direct sunlight for prolonged periods, especially in summer when surface temperatures can increase to above 70℃.

Mobile phones only have a limited number of charge cycles before the battery loses its capacity to recharge entirely.
www.shutterstock.com

Use battery-saving modes

Aaron Carroll and Gernot Heiser from Data61 analysed the power consumption of different smartphone components under a range of typical scenarios.

They concluded there are a handful of simple software and hardware strategies that can be used to preserve battery life.

  • Reduce screen brightness. The easiest way to conserve battery life while maintaining full function is to reduce the brightness of the screen. For devices such as mobile phones that have an organic light emitting diode (OLED) display, you can also use the “light on dark” option for viewing.

  • Turn off the cellular network or limit talk time. The connection to the cellular network uses the global system for mobile communication (GSM) module. The GSM is the most dominant energy-consuming component in a mobile phone, so it is beneficial to turn it off altogether or at least limit call time.

  • Use Wi-Fi, not 4G. With Wi-Fi being up to 40% less power-hungry than 4G for internet browsing, turning off cellular data and using Wi-Fi instead will help your battery life.

  • Limit video content. Video processing is one of the most power-consuming operations on a mobile device.

  • Turn on smart battery modes. All modern mobile devices have a smart battery saving mode (for instance, Android has Power Saving Mode and iOS has Low Power Mode). These software features modify central processing unit (CPU) usage for different apps, screen brightness, notifications and various hardware options to reduce energy consumption.

  • Use Airplane mode. This mode typically disables GSM, Wi-Fi, bluetooth and GPS functions on your devices. When turning off all such auxiliary functions, the device will use only up to 5% of its usual energy consumption with the screen off. For comparison, simply having your device in idle can still use more than 15%.

Enhancing your phone’s battery usability requires a combination of limiting the use of power-hungry hardware and software, as well as handling mobile devices so as to maximise the charge capacity and minimise battery degradation.

The ConversationBy adopting these simple strategies, users can extend their battery life by more than 40% in any given day while maintaining a more consistent battery capacity throughout the lifetime of the device.

Jacek Jasieniak, Associate Professor of Materials Science & Engineering and Director of the Monash Energy Materials & Systems Institute (MEMSI), Monash University

This article was originally published on The Conversation. Read the original article.

Cloud, backup and storage devices: how best to protect your data


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How much data do you still store only on your mobile, tablet or laptop?
Shutterstock/Neirfy

Adnene Guabtni, Data61

We are producing more data than ever before, with more than 2.5 quintillion bytes produced every day, according to computer giant IBM. That’s a staggering 2,500,000,000,000 gigabytes of data and it’s growing fast. The Conversation

We have never been so connected through smart phones, smart watches, laptops and all sorts of wearable technologies inundating today’s marketplace. There were an estimated 6.4 billion connected “things” in 2016, up 30% from the previous year.

We are also continuously sending and receiving data over our networks. This unstoppable growth is unsustainable without some kind of smartness in the way we all produce, store, share and backup data now and in the future.

In the cloud

Cloud services play an essential role in achieving sustainable data management by easing the strain on bandwidth, storage and backup solutions.

But is the cloud paving the way to better backup services or is it rendering backup itself obsolete? And what’s the trade-off in terms of data safety, and how can it be mitigated so you can safely store your data in the cloud?

The cloud is often thought of as an online backup solution that works in the background on your devices to keep your photos and documents, whether personal or work related, backed up on remote servers.

In reality, the cloud has a lot more to offer. It connects people together, helping them store and share data online and even work together online to create data collaboratively.

It also makes your data ubiquitous, so that if you lose your phone or your device fails you simply buy a new one, sign in to your cloud account and voila! – all your data are on your new device in a matter of minutes.

Do you really back up your data?

An important advantage of cloud-based backup services is also the automation and ease of use. With traditional backup solutions, such as using a separate drive, people often discover, a little too late, that they did not back up certain files.

Relying on the user to do backups is risky, so automating it is exactly where cloud backup is making a difference.

Cloud solutions have begun to evolve from online backup services to primary storage services. People are increasingly moving from storing their data on their device’s internal storage (hard drives) to storing them directly in cloud-based repositories such as DropBox, Google Drive and Microsoft’s OneDrive.

Devices such as Google’s Chromebook do not use much local storage to store your data. Instead, they are part of a new trend in which everything you produce or consume on the internet, at work or at home, would come from the cloud and be stored there too.

Recently announced cloud technologies such as Google’s Drive File Stream or Dropbox’s Smart Sync are excellent examples of how cloud storage services are heading in a new direction with less data on the device and a bigger primary storage role for the cloud.

Here is how it works. Instead of keeping local files on your device, placeholder files (sort of empty files) are used, and the actual data are kept in the cloud and downloaded back onto the device only when needed.

Edits to the files are pushed to the cloud so that no local copy is kept on your device. This drastically reduces the risk of data leaks when a device is lost or stolen.

So if your entire workspace is in the cloud, is backup no longer needed?

No. In fact, backup is more relevant than ever, as disasters can strike cloud providers themselves, with hacking and ransomware affecting cloud storage too.

Backup has always had the purpose of reducing risks using redundancy, by duplicating data across multiple locations. The same can apply to cloud storage which can be duplicated across multiple cloud locations or multiple cloud service providers.

Privacy matters

Yet beyond the disruption of the backup market, the number-one concern about the use of cloud services for storing user data is privacy.

Data privacy is strategically important, particularly when customer data are involved. Many privacy-related problems can happen when using the cloud.

There are concerns about the processes used by cloud providers for privacy management, which often trade privacy for convenience. There are also concerns about the technologies put in place by cloud providers to overcome privacy related issues, which are often not effective.

When it comes to technology, encryption tools protecting your sensitive data have actually been around for a long time.

Encryption works by scrambling your data with a very large digital number (called a key) that you keep secret so that only you can decrypt the data. Nobody else can decode your data without that key.

Using encryption tools to encrypt your data with your own key before transferring it into the cloud is a sensible thing to do. Some cloud service providers are now offering this option and letting you choose your own key.

Share vs encryption

But if you store data in the cloud for the purpose of sharing it with others – and that’s often the precise reason that users choose to use cloud storage – then you might require a process to distribute encryption keys to multiple participants.

This is where the hassle can start. People you share data with would need to get the key too, in some way or another. Once you share that key, how would you revoke it later on? How would you prevent it from being re-shared without your consent?

More importantly, how would you keep using the collaboration features offered by cloud providers, such as Google Docs, while working on encrypted files?

These are the key challenges ahead for cloud users and providers. Solutions to those challenges would truly be game-changing.

Adnene Guabtni, Senior Research Scientist/Engineer, Data61

This article was originally published on The Conversation. Read the original article.

Tech companies fight Trump’s travel ban and may take their business elsewhere


David Glance, University of Western Australia

127, mostly tech, companies have signed a brief of support opposing US President Trump’s “Muslim travel ban”. The companies, that include Apple, Google, Microsoft, Facebook and Tesla have filed an “amicus brief” with the 9th US Circuit Court of Appeals in support of US District Judge James L. Robart who ordered a stay on Trump’s executive order to ban anyone from 7 countries from entering the US for between 90 and 120 days.

The tech companies have argued that immigration is a central factor in the history and makeup of the US and has helped fuel American innovation and economic growth. Immigrants, or their children, founded more than 200 companies that are amongst the top 500 companies in the US. Between 2006 and 2010, immigrants were responsible for opening 28% of call new businesses in the US. Thirty percent of US Nobel laureates in Chemistry, Medicine and Physics have been immigrants.

Mostly however, the brief focuses on the harm that its chaotic implementation will have on US companies. They allege:

“The Order makes it more difficult and expensive for U.S. companies to recruit, hire, and retain some of the world’s best employees. It disrupts ongoing business operations. And it threatens companies’ ability to attract talent, business, and investment to the United States.

The consequences of this action will be that US companies will lose business and ultimately

“Multinational companies will have strong incentives, including from their own employees, to base operations outside the United States or to move or hire employees and make investments abroad.”

This last is no idle threat. In 2015, it was estimated that US companies have US $2.1 trillion overseas that haven’t been repatriated because of the tax implications. Apple alone has over US $230 billion held outside the US.

The idea of using this money to set up development and further manufacturing capabilities outside the US makes a great deal of sense, even without the imperative of Trump’s actions. However, there is another move that Trump is threatening that may make the decision to move operations outside the US more attractive still.

Trump’s administration is planning to target the high-skilled worker’s H-1B visa. This offers mostly tech companies the ability to recruit up to 85,000 skill developers and other staff from around the world. According to the Republicans and Trump however, tech companies should be recruiting locally.

Companies like Microsoft, where I have first hand experience of recruitment experience, did actively try and recruit within the US. Recruiting from outside is generally more expensive and time consuming and so there is no real reason why tech companies would actively ignore domestic applicants or favour foreign ones. Tech companies seek to employ the best people for the job and if the pool is global, that is how they achieve that goal.

Having offices remotely distributed can be made to work although it makes communications across teams and different product areas more challenging than if they are all in a single location. However, it already happens in most tech companies with Google and Microsoft already having research and product development occurring out of countries like Australia, India and China.

As outlined in the amicus brief, Trump is sowing uncertainty and chaos with his desire to treat policy like tweets on Twitter. That is going to provide enough incentive for companies to brave the potential disapproval from Trump and use the significant investments held outside the US to expand their capabilities.

Trump may succeed, contrary to his intentions, in catalysing a new phase in globalisation in which companies shift their centres from the US to a more distributed model. Of course, companies may still run into problems if Trump’s brand of nationalism succeeds in taking hold in other countries like Australia or Europe.

The other side-effect of the US uncertainty is the fact that increasingly businesses based outside the US will have a competitive advantage and customers may decide that it is easier to avoid doing business with the US for at least the next four years. China is rapidly becoming the technological equal of the US in many ways and so its ascendancy may also benefit.

The amicus curiae brief is the start of a long legal campaign which will aim to keep the worst of Trump’s plans in check. Depending on the outcomes, the world outside the US may actually benefit from Trump if companies are forced to look outside the walls, real and virtual, he is seeking to create.

The Conversation

David Glance, Director of UWA Centre for Software Practice, University of Western Australia

This article was originally published on The Conversation. Read the original article.

Australian IT Costs More – 50% More!!!


The link below is to an article that should have Aussies seeing red – we are paying up to 50% more than we should be for IT products, which is of little real surprise to most of us. Right across the board we have been paying more and there seems to be no real reason for it to be so other than the greed of big business.

For more visit:
http://www.theaustralian.com.au/australian-it/personal-tech/australians-pay-50-per-cent-more-for-tech-goods/story-e6frgazf-1226687429151

Bible Apps in the Pew


The link below is to an article that reports on the increasing use of tablets, smartphones and other gadgets in the pew during church services as modern technology impacts at the local level.

Do you use a digital version of the Bible during church services? If so, what do you use? Please share in the comments.

For more visit:
http://bits.blogs.nytimes.com/2013/07/27/the-bible-gets-an-upgrade/