In accordance to Paul B. Mckimmy (2003), “The first concern of cellular technology is bandwidth. 802. 11b (one of four existing wireless Ethernet, standards) happens to be the most available and affordable specification. It allows a maximum of 11 megabits per second (Mbps)” (p. 111); the author adds that wired Ethernet LANs are typically 10 or 100 Mbps.
In 1997, when the IEEE 802. 14 standard was initially ratified, cellular LANs had been incompatible and remained merchant specific; the 802. eleven protocol representeded an important step towards standardization (Passmore, 2000). Wireless neighborhood network (LAN) technology, nevertheless , has basically been in use since the past due 1980s; several proprietary strategies were frequently used, and the sites operated at lower rates of speed (e. g., 1-2 Mbps). In 1997, though, the standards setting body, IEEE, introduced the 802. (11) common for wi-fi local area networking using the unlicensed 2 . 5 GHz frequency band (as opposed to the 900 Megahertz band utilized in the past); this regular was afterwards updated to 802. 11b, which increased the transmitting speed via 2 to 11 Mbps, or about the same transmission speed because traditional ” cable ” Ethernet cable connections. This is the normal that is generally referred to today as Wi fi (“wireless fidelity”) or wi-fi LAN (Emerging Technologies, 2002).
Because 802. 11a transmits at a different frequency, it remains antagónico with existing Wi-Fi networks; in other words, “new base areas and consumer cards will be needed. it can likely that vendors will offer you dual-standard products, but they are not yet available. It is also possible, however , to get both criteria to co-exist in the same environment” (Emerging Technologies, 2002, p. 6). The incompatibility issue has additionally resulted in still another revision from the 802. eleven standard being proposed; however , this edition has not however been finished. Currently, 802. 11g likewise operates by 54 Mbps; however , 802. 11g operates in the same 2 . 5 GHz rate of recurrence as Wi fi thereby featuring for retrofitted compatibility with existing Wi-Fi networks. In line with the industry analysts at) Dialect, Learning Technology, “Stay fine-tined, since there is certainly yet another fresh protocol being discussed, 802. 11e, which adds QoS (“quality of service”) to high speed bandwidth, ensuring a reliable stream of data transmitting to specific clients, essential for effective video streaming” (Emerging Solutions, 2004, p. 6).
Although vendors carry on and seek a mutually appropriate protocol in North America, the people all over the world is continuing at total speed in other directions and a number of other requirements for wi-fi local sites have appeared as well, including Bluetooth and HomePNA (Passmore, 2000). Rather than being a wi-fi LAN, even though, Bluetooth is truly a “personal-area network” (PAN); however, some analysts expect that it may surpass 802. 11 WLANs in reputation. According to Passmore, “Bluetooth is a short-range radio program for interconnecting many types of devices including mobile phones, PCs, printers, digital cameras, PDAs and products within vehicles. It is restricted to a 10-meter radius and to transmission rates of just one Mbps” (p. 22). Inspite of these limitations, Bluetooth remains to be a viable contender in the wireless networking marketplace; this protocol occupies precisely the same 2 . 4-GHz frequency group as 802. 11, even though studies have got indicated which the two systems will be able to coexist as long as they are not in close closeness, simultaneous transmissions may decrease the throughput of each by around 25%. Furthermore, this publisher points out which it might also become technologically impossible to construct a machine that can support the two standards, because the device would probably interfere with itself (Passmore, 2000). Although hundreds of vendors had jumped around the Bluetooth popularity a few years back, this technology does not seem to have retained the same popularity of the 802. 11 series.
For personal use, some potential competitors to 802. 10 have included the Home Mobile phone Networking Connections (HomePNA) and HomeRF requirements. For example , Proxim’s HomeRF (marketed under the “Symphony” name), combines the 802. 11b and the Digital Improved Cordless Telecommunications (DECT) lightweight phone specifications into a single program; the latest type (HomeRF 2 . 0 by 2004) installments throughput range of motion 1 . 6th to 12 Mbps; yet , it is also not compatible with Wi fi. Based on Intel’s recent decision to not support HomeRF, this application’s upcoming remains uncertain (Emerging Technology, 2004). In accordance to Passmore, HomePNA devices were at first designed to enable systems to work with the existing wiring for LOCAL AREA NETWORK connectivity; nevertheless , this retrofitting came by a high price (a rate of just one Mbps with out mobility); HomeRF was designed to cost less, nevertheless poor functionality issues have affected it is development in comparison to the already affordable prices available for the 802. 10 protocols, increasing the concern of this protocol’s future.
Finally, an IEEE 802. 1a standards effort called HiperLAN2 is intended to produce the “next generation” of wireless LAN products (Passmore, 2000). HiperLAN2, developed by Nokia and Ericsson, and given the green light by the Euro Telecommunication Standardization Institute (ETSI), is similar to, nevertheless like HomeRF, it is not suitable for, 802. 11a in that by using the your five. 4 GHz frequency which has a throughput of 54 Mbps; however , although 802. 11a is mainly a data-delivery protocol, HiperLAN2 provides integrated support to get voice and video as well as offering QoS transmissions (Emerging Technologies, 2004).
In accordance to “Emerging Technologies, ” “HiperLAN2 likewise provides for unicast, multicast, and broadcast gears. Most experts see it as the most advanced wifi standard at present available” (emphasis added) (p. 6). Vance points out that North America is constantly on the dominate global sales, though, accounting to get 71% in the market, even though the Asia/Pacific place represented 18% of the total, and Europe/Middle East/Africa (EMEA) and the remaining portion of the world total 8% and 2% from the worldwide total respectively. Relating to this publisher, “There happen to be two crucial factors in charge of the sluggish rate of adoption of 802. 11b in Europe. First, till recently, The european union had its very own WLAN specifications – HiperLAN and HiperLAN2 -which achieved it very difficult for 802. 11b to gain any kind of traction. Second, 802. 11b operates in the 2. 4 GHz spectrum, which can be unlicensed generally in most of the world, with all the notable different of specific European countries. In Italy, for example , 2 . 4 GHz range is controlled by the authorities and therefore is usually licensed” (p. 37). Even so, the modern 802. 11a standard, which in turn operates in the 5-GHz spectrum, appears to solve some of these concerns, while also providing buyers with higher bandwidth (54 Mbps versus 11 Mbps for 802. 11b) plus more non-overlapping stations (eight vs . three intended for 802. 11b) (Vance, 2002).
HiperLAN2 plus the 802. 14 permutations stay the two main protocols being utilized in the Western and North American marketplaces; however , others happen to be under advancement elsewhere around the globe, a situation that in many ways echoes that being experienced in the cellular telephony industry. Right now there, Europe (and most of the remaining world except Japan) uses GSM (“Global System pertaining to Mobile Communications”) while United states has adopted analog (AMPS – “Advanced Mobile Phone Service”) and digital (CDMA – “Code Division Multiple Access”; TDMA – “Time Department Multiple Access”). While GSM is available in the U. T. And Canada, coverage continues to be limited (Emerging Technologies, 2004).
Attention in GSM will be fueled simply based on growing interest in these global match ups issues as well interest in a newly introduced add-on/successor to GSM referred to as GPRS (“General Packet Radio Service”); this kind of innovation provides always-on, higher-bandwidth data transmissions/Internet access. A comparable info enhancement to CDMA is known as “1xRTT, inches and this technology started reaching the North American industry last year (Emerging Technologies, 2004).
The data transmission service of analog cellular in North America (CDPD – “Cellular Digital Packet Data”) provides Access to the internet and continues to be available for time now; CDPD already gives wide insurance coverage in the United States, but this technology continues to be limited by a comparatively slow transmission rate of 19. two kbps (kilobits per second), a rate that is appropriate for email-based, perhaps, nevertheless woefully limited for Net browsing applications (landline modems generally operate at 56 kbps). The CDPD assistance is available pertaining to both hand-helds and laptops through PC cards just like Novatel’s Marteau series; some of the more high end PC cards, such as Macizo Wireless’ AirCard, employ compression software to increase enhance gain access to speed. Still another – and faster – alternative introduced in the United States has been the Ricochet network; this system works at 128 kbps; although the network’s parent company, Metricom, declared personal bankruptcy in August, 2001, Aerie Systems purchased the Ricochet network and offers announced plans to continue service in the usa (Emerging Technologies, 2004).
Much of the attention in the mobile phone website for the past several years has been focused on 3G, the third-generation cellular network; this approach combines high-speed mobile access with Net Protocol (IP)-based services thereby providing more quickly, more reliable, always-on connections (Emerging Technologies, 2004). According to Anderson, Bikson, Hundley and Neu (2003), “Third-generation (3G) wireless is definitely the designation used on multimedia (voice, data, and video) cell phones and networks that will be used over the years to come. These 3-G cellular phones possess a much greater bandwidth than the