In: Categories » Electronics and communication » Mobile cell phones » Cellular and PCS based Technologies
|
Cellular and PCS telephones will be the predominant mobile communications technologies for the foreseeable future. This does not mean to imply that cellular is superior to other technologies, only that it is more prevalent. With nearly 1 billion users worldwide, there is no close second. These mobile technologies are currently facing a major evolution in many areas, however, including the technical and business sectors, because they provide the economical means for realization of not only mobile computing, but also many other applications ranging from financial and retail communications to remote control and signaling. Recent technology, whether it’s TDMA, CDMA, or GSM has experienced severe physical layer and user interface constraints. Wireless data transmission is limited to relatively low speeds, 19.2 Kbps or less. Cellular display applications for data are limited to text messaging through SMS or WAP. There is a wide disparity between browser applications. Some simple graphics can be accomplished with WAP applications on some phones, whereas i-Mode in Japan offers extensive graphics including color displays on PDC phones,* even though the data rates are similar. As GPRS is launched on GSM networks, users will finally be able to access data at speeds superior to traditional dial-up Internet service, approaching 115 Kbps. With the launch of next-generation cellular systems and 3G systems, users will have greater choice for data communications. New modems will be commercially available to take advantage of higher bandwidth networks, and packet data will replace circuit-switched data. Choices will include either SMS or a wireless modem using packet data at higher speeds. New high-speed data capabilities will provide the platform for mobile multimedia services, access to corporate LANs, and financial transactions from a mobile terminal. The type of service will determine the best data service to use. Many applications will find SMS satisfactory even if a modem is available for high data-rate service. And those that must use analog cellular will still have CDPD. Some cellular-based products will bear little resemblance to a cellular phone at all, such as PCMCIA modems that incorporate a cellular phone without voice capabilities. In addition to standard products, custom products will be available for wireless remote data and control applications. * PDC in Japan is very similar to North American TDMA.
|
legal disclaimer
1) Our website is not responsible for the information contained by this article as well for any and all copyright infringements by authors and writers. E-articles is a free information resource. If you suspect this article for any copyright infringements, please read the Terms of service and contact us to investigate the problem.
2) The E-articles directory team is not responsible for inaccuracies, falsehoods, or any other types of misinformation this tutorial may contain and will not be liable for any loss or damage suffered by a user through the user's reliance on the information gained here. Please read the Terms of service
Useful tools and features
If you like this article (tutorial), please link to it from your web page using the information above. Linking to this page, this is the only way to help us improve our service, the same time providing your visitors with a way to improve their online experience.
related articles
Location-Reporting Technology Mobile phone companies are under orders from the FCC to incorporate location-reporting technology into cellular phones. Dubbed E-911, or enhanced 911, the initiative is meant to provide law enforcement and emergency services personnel with a way to find people calling 911 from mobile phones when callers do not know where they are or are unable to say. Since no carrier was able to make an October 2001 deadline to fully implement E-911, the FCC issued waivers permitti...
2. The Main Protocols used by Mobile Phones (SMS EMS MMS WAP)
Short Message Service (SMS) Short Message Service (SMS) is a text message service that enables the transmission of short messages between a cell phone, PDA, PC, or any device with an Internet protocol (IP) address. Since this service was standardized in the mid 1990s, it has recorded tens of billions of messages and is being used worldwide. SMS was introduced in the Global System for Mobile Communications (GSM) and later adopted by other mobile communication systems such as Time Division Multiple Access (TDM...
3. What is Advanced Mobile Phone Service (AMPS)
Before the age of digital services, the predominant technology for analog cellular phone services in North America adhered to a set of standards for Advanced Mobile Phone Service (AMPS). Originally, AMPS operated in the 800-MHz frequency band using 30-kHz-wide channels. Avariant of AMPS, known as Narrowband AMPS (NAMPS), uses 10-kHz-wide channels and consequently has triple the capacity of AMPS. Although AMPS or a variation of AMPS is still around— chances are that your cellular phone allows you to switch bet...
4. Cordless Telecommunications versus Cellular Phones ~ Advantages and Disadvantages
Although cellular phones and cordless phones are both wireless, they have come to assume quite distinct and separate applications based on their areas of use and the differing technologies developed to meet user requirements. Cellular and cordless are implemented with their own standardsbased technologies. Briefly, cellular telephones are intended for off-site use. The systems are designed for a relatively low density of users. In this environment, macrocellular technology provides wide area coverage and t...
5. What are Cell Sites
Acellular system operates by dividing a large geographic service area into cells and assigning the same frequencies to multiple, nonadjacent cells. This is known in the industry as “frequency reuse.” As a subscriber travels across the service area, the call is transferred (handed off) from one cell to another without noticeable interruption. All the base stations in a cellular system, including radio towers, are connected to a mobile telephone switching office (MTSO) by landline or microwave links. The MT...
6. Short Introduction in Cellular Data Communications
One of the oldest services for sending data over a cellular communications network is known as “Cellular Digital Packet Data” (CDPD), which provides a way of passing Internet Protocol (IP) data packets over analog cellular voice networks at speeds of up to 19.2 kbps. Although CDPD employs digital modulation and signal processing techniques, the underlying service is still analog. The medium used to transport data consists of the idle radio channels typically used for Advanced Mobile Phone System (AMPS) cel...
7. What is Code Division Multiple Access and its Features and Options
Code Division Multiple Access (CDMA) is a spread-spectrum technology that is used for implementing cellular telephone service. Spread spectrum is a family of digital communication techniques originally used in military communications and control applications. Spread spectrum uses carrier waves that consume a much wider bandwidth than that required for simple point-to-point communication at the same data rate. This results in the carrier wave looking more like random noise than real communication between a sender and r...
8. Which are the basic Features and Options of a mobile phone
Cellular telephones offer many features and options, including Voice activation Sometimes called “hands-free operation,” this feature allows the user to establish and answer calls by issuing verbal commands. This safety feature enables a driver to control the unit without becoming visually distracted. Memory functions These allow storage of frequently called numbers to simplify dialing. Units may offer as few as 10 memory locations or in excess of 100, depending on model ...
9. M COMMERCE ~ SECURITY PAYS OFF
Providing secure payments and protecting the privacy of an individual’s personal data is critical to the growth of mobile ecommerce, also known as m-commerce. M-commerce may someday provide a true alternative to cash and make purchasing items as easy as hitting a few keys on the keypad of your Wireless Internet device. One of the most important issues to overcome in the area of m-commerce is fraud. It’s easy enough to prove payment in the physical world—cash works well and credit cards have sophisticated prot...