There are already 1.5 billion smartphone users and a total of 5 billion mobile phones in the world. Smartphone companies are announcing new phone models with improved capabilities every year. These are smarter and better phones with new sensors, powerful chips, and new capabilities. Newspapers and technology blogs often start discussing rumors about an upcoming smartphone several months before its launch.

Over the past few years, we have seen many futuristic prototypes and designs. Consumers request better and smarter phones that can handle more and more tasks with every new model. Although the phone companies are surprising us with new smartphones every year, we are far from seeing some of the technologies presented in prototypes. What do you expect to see in smartphones in the next 5 to 10 years? Let’s talk about some of the technologies that will end up in a smartphone in the near future.

One of the critical components in a smartphone is the battery. While most smartphones only support being charged from a wall plug, some of them are supporting inductive wireless charging out of the box. Although it is not a standard feature for most smartphones, wireless charging can be enabled using third-party cases and charging pads. Current wireless charging systems still require the smartphone to be placed on a pad for charging. A bigger step in powering smartphones will be touchless wireless charging. A new startup company, Ossia [1], recently unveiled the world’s first commercially viable touchless remote wireless power system. Imagine you are walking into your house or office, and the smartphone in your pocket is starting to charge via receiving electric waves through the air.

With wired or wireless charging, the battery technology of smartphones remained largely unchanged for years. A large percentage of smartphone bodies are occupied by lithium-ion batteries. With the developments of new power efficient displays and computing chips, smartphones are now using less and less power. This allows manufacturers to use smaller batteries with the same usage time. Battery technologies are not efficient enough to power smartphones more than a couple of days with average daily usage. People often carry extra batteries and chargers when travelling or spending time outside. Solar charging can help with some of these challenges by enabling smartphones to recharge under sunlight. Researchers are also exploring other materials to replace lithium-ion (e.g. graphene) in batteries to provide extra power for the ever-growing size of smartphone displays.

Smartphone displays are getting bigger and better with ultra-high screen resolutions that are sometimes even stronger than the human eye. Some manufacturers are already working on 4K ultra HD displays (3840 pixels wide by 2160 pixels tall). With the screen sizes getting larger, the distinction between a smartphone and tablet is becoming less clear. Some smartphones are even called phablet, a new category between smartphones and tablets, by newspapers and tech blogs.

A bigger jump in display technology will be through the use of flexible screens. There are already prototypes of 5-inch flexible displays or 50 inch curved televisions from several companies. One benefit of flexible displays would be fitting a tablet size screen on a small smartphone body. Users will be able to slide or unfold the display of a typical size (e.g. 4-inch) smartphone, and convert it to an 8-inch tablet. Companies are still looking for a good use case for flexible displays in daily life. Some applications of the smartphones with flexible displays make them closer to wearable devices. Some of them have appeared as watches or bracelets.

Another development in display technology is transparency. There are already prototypes of transparent displays in various sizes and forms. Transparency is important for heads-up displays and some models where seeing the background is necessary. This technology will allow displays on glasses, contact lenses, windows, and windshields. An obvious application of the transparent displays in cars is a GPS navigation system on the windshield [2]. This will open a full immersive experience by showing directions directly positioned on the road, virtual signs on the sidewalks, and even augmented information about companies and addresses directly on the walls of the buildings. Imagine seeing a large virtual menu or information panel with available seats, business hours, and prices on the wall of a restaurant. While the transparent displays are already available in various prototypes, the main challenge is achieving transparency in electronics and other components in a smartphone.

Even with flexible displays, you may not be able to carry and fold a 50-inch display into typical smartphone size. A major shift from increasing the display size will come via the use of pico-projectors. A smartphone, with a decent display size (e.g. 5 inch) for everyday use, can be turned into a full size (e.g. 50-inch) media consumption system with an integrated pico-projector. Although there are prototypes of pico-projectors embedded into smartphones, there are still many technical limitations in projection size, brightness, battery life, and cost of components.

While larger displays provide a better experience for users, the consumable content is mostly 2-dimensional. Even though there are games and movies designed and recorded in 3-dimensional environments, they still cannot provide a true 3D experience. All of this 3D content is projected onto a 2D screen in smartphones. There are prototypes giving the 3D effect by providing 2 separate images to both eyes by using a stereoscopy or parallax barrier. These technologies have limitations in field of view, viewing angle, interactivity, and distance of viewer. Researchers can create a pseudo 3D experience via head tracking, using camera or sensors to provide a glass-free experience. This allows users to see a different perspective of the scene on the phone by looking from different angles. The technology is still in its early steps with limited applications and hardware support for the full immersive experience and interaction.

The keyboard is main point of interaction in smartphones. One of the major changes in smartphones was eliminating the physical keyboard on the phone. Now most of the front face of the phone is covered with the display. Multi touch displays provide on-screen keyboard for text input. While they are similar in size, on-screen keyboards allow customization for different languages, use cases, and applications. On-screen keyboards try to imitate the haptic feedback through vibrations, but still cover almost half of the screen during typing. There are prototypes with air-inflatable buttons in real 3D forms using a transparent layer on the screen to provide realistic haptic feedback. The size of the keyboard is the main limitation for smartphones. A new prototype eliminates even the on-screen keyboard using laser projection. A small device projects a full size virtual keyboard on a flat surface like table using lasers, and tracks finger movements for recognizing key inputs. This allows both customization and experience of a full size keyboard, while making the screen fully available for other functions on the phone.

While the main input point for the phone is through virtual or on screen keyboards, a smartphone actually gets many inputs from outside through sensors. The full potential of these phones can only be achieved through new technological sensors in the phone. GPS and compass sensors allow navigation and direction capabilities, and replace the need for a GPS device for most users. Many smartphones are now listed as the most used camera devices on photography websites, and are getting closer to the quality of a DSLR camera with new image sensors. Proximity sensors understand the distance between device and user, and allow the device to turn off the display during phone calls to reduce battery usage. Accelerometer and gyro sensors provide new inputs for gaming and user interaction. Barometer, temperature, humidity, gesture, fingerprint, and heart rate sensors are becoming part of many smartphones. Researchers are already experimenting with ultrasound [3] and x-ray scanners [4] for smartphones, and we are getting one step closer to the Star Trek tricorder, a general-purpose science fiction health diagnosis device.

The future of smartphones is almost unlimited. We have already seen novel technologies introduced for smartphones as prototypes and concept designs. We can easily extend the list with intelligent assistants, nano-coating for waterproofing and self-cleaning, seamless integration of voice controls and augmented reality, environmental and medical sensors, and 3D and holographic displays. I can’t wait to see some of these technologies integrated into smartphones in the near future.

While smartphones revolutionized the way we communicate and how we carry out many of our daily tasks, at the same time they are challenging our privacy, safety, behavioral codes, social life, and the use of public space. The problems and discussions will not end here, and they are growing with the introduction of new sensors and capabilities. Increasing awareness through education about the security and privacy risks that smartphones present is the first step for protecting users from future problems. Parents and educators have a critical role for raising responsible generations, and they can start with becoming a good role model [5] on how they use their smartphones…

Acknowledgment: This article is produced at Mergeous [6], an online article and project development service for authors and publishers dedicated to the advancement of technologies in the merging realms of science and spiritual thought.

References

1. Darrell Etherington. 2013. “Cota By Ossia Aims To Drive A Wireless Power Revolution And Change How We Think About Charging,” September.
2. Jared Newman. 2013. “GPS on Your Windshield: Garmin Brings Navigation HUDs to Regular Old Cars,” Time Magazine, July.
3. “Ultrasound scan and health check using your smartphone,” BBC News, December 2013.
4. James Plafke. 2013. “Tiny terahertz chips can give smartphones X-ray vision, tricorder-like functionality,” ExtremeTech, July.
5. Larry Magid. 2012. “Smartphone Guide for Parents of Tweens and Teens,” SafeKids.com, August 2012.
6. Mergeous, Online article and project development service, mergeous.com.

As we approach the new millennium, satellite-based communication systems will be the next frontier for this industry. They will assume a vital role in infrastructure, securing telecommunication links during disasters and supporting humanity’s space-based efforts.

A new epoch in space-based wireless communications has already begun with the deployment of two low-Earth-orbiting (LEO) communication satellite systems: Iridium and Globalstar. The Motorola-led Iridium consortium successfully launched the last five satellites in its strong network during the last year. The entire Iridium network integrates terrestrial phone systems and satellites.

Several other satellite systems having global or broad geographical coverage will join this new arena within the next 3 to 4 years, thereby complementing and extending existing terrestrial wireless services. Users of conventional terrestrial cellular services, business people, travelers, maritime vessels, aeronautical and industrial facilities, journalists, government agencies, the Coast Guard and emergency-related organizations, others on the go, and people living in sparsely populated areas will be able to communicate with each other via these services.

Satellite-based mobile communication systems are characterized by the distance of their satellites from Earth. LEO satellites are typically located 310 miles (500 kms) to 932 miles (1,500 kms) above the planet, whereas medium-Earth-orbit (MEO) versions are located from 3,100 miles (5,000 kms) to 7,456 miles (12,000 kms) above the planet. Geosynchronous Earth-orbit satellites, located 22,245 miles (35,800 kms) above the equator, move in synchronism with Earth’s rotation. While GEO satellites seem to be stationary to an Earthbound observer, LEO and MEO satellites appear to be in constant movement.

GEO SYSTEMS

GEO satellites have been used in such commercial communication services as television broadcasting and long-distance telephone trunking, and for maritime communication services since 1965. With the exception of the polar regions, global coverage can be provided by three GEO satellites equally spaced above the equator. In the past, GEO satellites were not viable for hand-held phone communications due to the lengthy signal propagation delay and large power loss. Advances in space technology, however, allow satellites equipped with large-aperture phased array antennas to increase their transmitting power, thereby making the GEO approach viable for delivering telephony to hand-held phones in vast areas of the world.

Several operators have opted for regional GEO systems, which typically require a single satellite. The Asia Cellular Satellite System (ACeS), which is being developed by a three-company consortium from Indonesia, Thailand, and the Philippines, will provide services in 26 Southeast Asian countries, including Japan, China, India, and Pakistan. ACeS’s satellite, positioned over the equator at 118 degrees east longitude above the island of Borneo, offers mobile phone, facsimile, data, and paging services. Hence, many people in this region who have no access to terrestrial communication links will one day be able to roam anywhere they wish and still keep in touch with each other.

Another regional GEO satellite, Thuraya, will furnish mobile satellite services to 1.8 billion people in 58 countries ranging from the Middle East and North Africa to eastern Europe, Turkey, the Indian subcontinent, and Central Asia. Thuraya will be positioned over the equator at 44 degrees east above the Somali coast. The program, a consortium of 14 telecommunications organizations in various Arab countries, is run out if its headquarters in the Thuraya Satellite Communications Co., located in Abu Dhabi, United Arab Emirates.

The Thuraya system will use a time-division-multiple-access (TDMA) scheme and support 13,750 voice channels. Hughes Network Systems will supply the dual-mode handsets. The satellite will connect calls from users to other users through its 256 reconfigurable spot beams. The company presently envisions an air-time price of US $0.50 per minute for system users.

LEO SYSTEMS

LEO satellites at very low altitudes differ from GEO satellites in two main ways: they are close enough to receive hand-held device signals with a very small propagation delay, and they form cellular towers in the sky. The major disadvantage of LEO systems, when compared with GEO systems, is that they require more satellites with a smaller size and lighter weights to provide global coverage. Complicated ground-based tracking systems are needed to control LEO satellites.

The Iridium system operated by the Motorola-led international consortium of 20 telecommunications and industrial companies is the first LEO system to turn the promise of global wireless service into a reality. By integrating ground-based cellular infrastructures with 66 LEO satellites and thus forming a cross-linked grid 485 miles (780 kms) above the Earth, Iridium provides such global telecommunications as telephony, data, and pager services.

Each satellite in the Iridium constellation rotates around the Earth within a period of approximately 100 minutes at one of the six orbital planes of 86.4 degrees inclination. With one global telephone number and an Iridium satellite phone, you can contact anyone on the planet. The satellite’s on-board processor processes calls placed by hand-held subscribers or forwarded by gateways and routes to other Iridium satellites in the constellation or to gateways on the ground. This inter-satellite networking capability and direct access of hand-held subscribers to the satellite is a significant distinguishing feature of the Iridium system.

The system operates at four different links and in four different frequency bands. Each satellite in the constellation is connected by radio transmission to four others at frequencies between 23.18-23.38 GHz. Hand-held users can communicate directly with the satellite in the 1.616-1.626 GHz band. Links between the satellite and ground gateways also operate in 19.4-19.6 GHz (downlink) and 29.1-29.3 GHz (uplink) frequency range. Iridium handsets are dual-mode, working both as a typical cellular telephone and as a satellite telephone. Both TDMA and frequency-division-multiple-access (FDMA) technologies are embedded in the handsets, as in cellular GSM handsets. The satellites are controlled by a master control center located in Lansdowne, Virginia, USA.

Iridium launched its final satellites in early May 1998. The system is now operational and offers a wide variety of services to travelers, aeronautical industries, and military and governmental organizations. It provides voice, facsimile, and data communications for the cockpit and at passenger seats across all aviation segments. According to a recent press release by Stratos, an Iridium service provider, the American government had a contract with it and Hughes Global Services to obtain access to multi-network Iridium satellite services.

Another LEO satellite system that will provide global voice and data services is Globalstar. This system is global in nature, except for the polar regions. It is a constellation of 48 satellites orbiting with a period of 113 minutes in eight circular planes, and is inclined at 52 degrees at an altitude of 879 miles (1,414 kms). Global-star’s satellites are less complicated and cheaper than their Iridium counterparts. They have no on-board processor or intersatellite links (Iridium does), and thus act like well-established reflectors in the sky relaying signals directly to ground gateways. Rather than directly connecting one caller to another by satellite, calls are first routed to gateways and then uplinked to the satellite. The satellite then downlinks this received call to another gateway.

The primary owners of Globalstar are Loral Space and Communications Ltd., and Qualcomm Inc. The system is operated and serviced by 12 telecommunications companies. In order to avoid communication linkage drops, three or four 16-foot to 20-foot (5-meter to 6- meter) dish antennas are installed at Globalstar gateways. Unlike Iridium, Globalstar handsets utilize code-division-multiple-access (CDMA) technology. Globalstar’s unique capability is that signals from three or four visible satellites are combined at the gateways, and the strongest one is chosen to maximize power efficiency and eliminate call interruption. Therefore, satellites will be seamlessly added to and removed from calls in progress, as they are constantly moving in and out of view. So far, Globalstar has put 24 satellites in orbit. “With only two more successful launches of four satellites each, Globalstar will have the coverage required to initiate a regional roll-out of service in September,” says Bernard L. Schwartz, chairman and chief executive officer of Globalstar.

OTHER LITTLE LEOs and MEOs

Other LEOs, notbly Orbcomm and Teledesic, provide such telecommunication services as broadband Internet access, videoconferencing, and multimedia; however, they do not allow phone calls. These satellites are relatively small compared with those of Iridium and Globalstar, and were designed for two-way data communications. Orbcomm is a consortium of Orbital Science Corp., Canada’s Teleglobe Inc., and Malaysia’s Technology Resources Industries Bhd. Orbcomm’s total of 36 little LEOs will travel in two different circular orbits: one is located 460 miles (740 kms) above the Earth with 70 degrees inclination in pair, and the other is located at 523 miles (825 kms) in planes of eight with 45 degrees inclination. The Teledesic system will consist of 288 little LEO satellites in 12 polar orbital planes. It will provide data rates of 64 Mb/s, data rates 2,000 times faster than standard telephone modems. The system’s operation frequency will be 27.5 GHz in the uplink (from user to satellite), and 28.5 GHz in the downlink (from satellite to user). The company plans to start commercial service in 2002. Its investors are Microsoft founder Bill Gates, cellular phone pioneer Craig McCaw, Boeing, and the AT&T Corp.

ICO Global Communications will feature 10 operational MEO satellites located at an altitude of 6,434 miles (10,355 kms) in 45 degrees and 135 degrees inclined orbits. ICO’s ground network will consist of 12 ground stations with multiple antennas distributed strategically around the globe. Its gateways will function in ways similar to those of Global- star. The ICO system will launch its full service in 2000. ICO satellites are derived from an existing Hughes GEO satellite, and are four times heavier than Iridium satellites: 6,063 pounds (2,750 kgs) in orbit. ICO satellites travel more slowly than LEO satellites, thereby reducing the need for frequent handovers from one satellite to another.

Ellipso, an MEO system owned by Mobile Communications Holding Inc., Lockheed Martin Corp., Harris Corp., and three others from Australia and South Africa, will become fully operational in 2001. With 17 satellites in three orbital planes, it can provide almost complete global coverage. Seven equally spaced satellites located above the equator at an altitude of 5,008 miles (8,060 kms) will serve a 25 degrees north and a 55 degrees south latitude region. Another 10 satellites will orbit in two elliptical orbits inclined at 116 degrees. Each satellite will be able to handle 3,000 simultaneous phone calls.

REFERENCES

• Big LEO/MEO/GEO Market and Financial Review (1998).
• Glenister, Simon. “Iridium to Offer Aeronautical Service.” Integrating Global Air Traffic Management, ICAO/ISC (June 1998). (See also: www.
• iridium.com/english/industry/wero/medialarticle_index.html.)
• http://www.globalstar.com.
• http://www.iridium.com.
• Miller, Barry. “Satellites Free the Mobile Phone.” IEEE Spectrum Magazine (March 1998): 26-35.