|
|
发表于 2006-5-11 00:27:53| 字数 7,341| - 美国–密西西比州–杰克逊县 Telepak网络公司
|
显示全部楼层
There is also interesting potential for interoperability of WiMAX with legacy cellular networks. WiMAX antennas can "share" a cell tower without compromising the function of cellular arrays already in place. Companies that already lease cell sites in widespread service areas have a unique opportunity to diversify, and often already have the necessary spectrum available to them (i.e. they own the licenses for radio frequencies important to increased speed and/or range of a WiMAX connection). WiMAX antennae may be even connected to an Internet backbone via either a light fiber optics cable or a directional microwave link. Some cellular companies are evaluating WiMAX as a means of increasing bandwidth for a variety of data-intensive applications. In line with these possible applications is the technology's ability to serve as a very high bandwidth "back-haul" for Internet or cellular phone traffic from remote areas back to a backbone. Although the cost-effectiveness of WiMAX in a remote application will be higher, it is definitely not limited to such applications, and may in fact be an answer to expensive urban deployments of T1 back-hauls as well. Given developing countries' (such as in Africa) limited wired infrastructure, the costs to install a WiMAX station in conjunction with an existing cellular tower or even as a solitary hub will be diminutive in comparison to developing a wired solution. The wide, flat expanses and low population density of such an area lends itself well to WiMAX and its current diametrical range of 30 miles. For countries that have skipped wired infrastructure as a result of inhibitive costs and unsympathetic geography, WiMAX can enhance wireless infrastructure in an inexpensive, decentralized, deployment-friendly and effective manner.
[edit]
Product release
[edit]
2005
As of 2005, major cities in the USA such as Los Angeles, New York, Chicago, Boston, Providence (Rhode Island), and San Francisco are served by Towerstream. Seattle is served by Sprint and Speakeasy.net. In Canada, the University of Winnipeg has spearheaded a WiMax project in Winnipeg called LearningCITI and in Vancouver, BC by MetroBridge Networks. In China, Dalian and Chengdu are implementing pre-WiMAX networks that will be upgradeable when certification testing begins in late 2005. In Chile, Entel announced that it will start offering WiMax in 2006. Current Towerstream, Speakeasy, MetroBridgeand other deployments are of proprietary systems including Airspan Networks, Aperto, Alvarion VL OFDM, Redline Communications, and Dragonwave. Trial deployments have been mostly outside of the U.S. due to limited spectrum availability. Sprint has announced that they will begin trials of pre-certified WiMAX systems. Towerstream and MetroBridge will also introduce WiMAX systems to follow their highly successful pre-WiMAX network; servicing businesses, educational facilities and government entities.
At the July 2005 WiMAX Forum meeting in Vancouver, BC, WiMAX systems began certification testing. Disney took part in the Proof of Concept (POC) display. This showed real simultaneous multi-media capabilities.
April 2005: Intel start shipping its highly integrated WiMAX chip, formerly codenamed "Rosedale [1].
[edit]
2006
On January 20, 2006, Colombian company Telecom launched WiMAX on the city of Bucaramanga. Other Colombian cities such as Bogotá, Medellín and Cali have planned to launch WiMAX in 2006. Over 150 WiMAX and pre-WiMAX certified systems trials are now reported to be under way (WiMAX Forum).
On 20 March, 2006, UK start-up Urban Wimax launched the UK's first standards-based WiMAX network in Westminster. They will be targeting SMEs looking for symmetrical broadband connections.
On March 31, 2006, a joint venture between Rogers Communications and Bell Canada announced availability of a national wireless broadband network based on pre-WiMAX standards that would cover over 100 urban and rural areas across Canada. At the time of the announcement, this deployment was one of the largest of its kind in the world.
Among the more prodigious efforts to date are the roll-outs of WiBro/WiMAXm in South Korea: this is a well funded effort to provide service that will evolve from 'simple mobility' to full mobility that is harmonized with 802.16e-2005. Taiwan has similarly allocated 2.3 GHz spectrum and provided government support for WiMAX efforts which are expected to start trials in the second half of 2006.
Numerous regional and national efforts have shown early success: Yozan has increased the plans to roll out WiMAX in Japan, a bellwether for wireless developments.
[edit]
FIXED AND MOBILE
April 2006 is seeing the first releases of two, mutually incompatible, versions of WiMAX creating a challenge for everyone in the industry, namely, picking the version that will fare best in the long run. 802.16-2004 WiMAX only supports fixed access, but products are already available. 802.16e WiMAX supports mobile and fixed access but products are still at least a year away.
In one of the most significant WiMAX deployments to date, regional service provider Arialink Broadband, says it is building out a broadband wireless network for all of Muskegon County, Mich., using 802.16e equipment from Samsung Corp. Competition from wired technologies (DSL, cable modem, fiber-to-the-home) and from wireless technologies (Wi-Fi, 3G including WCDMA, HSDPA, EV-DO, TD-CDMA, and proprietary solutions like Qualcomm's FLASH-OFDM) has made it a very broad connectivity market.
Recently announced in Red Herring.com, Clearwire, - a so called 'start-up' - is looking to invest about $1 billion in funds to build its own WiMAX network. Towerstream, has continued to service large cities in the United States, testing and installing WiMAX certified equipment as it is officially released.
The WiMAX Forum member companies and products to complete certification and interoperability testing include Airspan's MacroMAX base station and EasyST subscriber station solution, Axxcelera's ExcelMax base station, Sequans Communications' SQN1010-RD subscriber station solution, Siemens' WayMAX@vantage base station and subscriber station solutions, Aperto's Packetmax 5000 base station, Redline Communication's RedMAX base station and subscriber unit, Proxim Wireless Tsunami MP16 3500, and Wavesat's miniMAX subscriber station solution.
[edit]
PCMCIA, FPGA
Beyond these metro area rollouts, WiMAX is like Wi-Fi in that you can "roll your own". April 2006 has many companies moving into the WiMAX arena. Intel continues to be a major driver in the worldwide implementation towards the proliferation and price reduction. Taken at face value, Intel claims to be able to drive the price per user to zero over the next 3-4 years. That is due to embedding WiMAX into the system processors and board architectures for laptop, PDA and other devices. Of course, the price is not zero as premium features drives acceptance of premium 'Intel Inside' driven designs. But as a competitive positioning strategy, the ability to embed multi-mode WiMAX/WiFi/cellular into consumer and IT products should create a compelling argument for WiMAX's acceptance which increases exponentially with each successful deployment.
[edit]
WiBro:South Korean version
Perhaps the most telling deployments for WiMAX will be for the WiBro mobile derivative: WiBro has South Korean government support with the requirement for each carrier to spend over $1 billion US for deployments. The Koreans sought to develop WiBro as a regional and potentially international alternative to 3.5-4G systems. But given the lack of self developed momentum as a standard, WiBro has joined WiMAX and agreed to harmonize with the similar OFDMA 802.16e version of the standard. What makes WiBro roll outs, which will start in April of 2006, a good 'test case' for the overall WiMAX effort is that it is mobile, well thought out for delivery of wireless broadband services, and the fact that the deployment is taking place in a highly sophisticated, broadband saturated market. WiBro will go up against 3G and very high bandwidth wire line services rather than as gap-filler or rural under-served market deployments as is often exampled as the 'best fit' markets for WiMAX. WiBro goes much more "in your face" in direct competition with 3G and high bandwidth wired services which pose tough competition. Telecom Italia, the dominant telephony and internet service provider in Italy has announced it will test, together with Korean Samsung Electronics, a WiBro network service, starting from Winter Olympic Games 2006, held in Turin. |
|
[复制链接]
|自动提醒
狗仔卡
离线
提升卡
置顶卡
变色卡
