Evolution of Wireless Systems Sample Clauses

Evolution of Wireless Systems. ‌ Since the xxxx of humanity, it was a target of mankind to be able to communicate over long distances. Smoke signals and pigeon post are early manifestation of this desire. With the formulation of the mathematical theory of electromagnetic waves by Xxxxxxx in 1873, a journey of wireless communications started. Xxxxxxx made a historic milestone by realising radio wave transatlantic communications in 1901. Before the end of the 1940s, AM, FM and TV communication systems became available. Satellite communication, which started in the late 50s, was a major step in the evolution of wireless communications [2–4]. Probably the most important breakthrough for contemporary mobile commu- nication systems was the introduction of the concept of cellular mobile commu- nication by AT&T (American Telephone and Telegraph) Bell labs in the 1970s. This is now considered the first generation (1G) of cellular mobile communication systems, which are currently progressing towards 6G. The 1G and 2G systems provided only voice services. The evolved generation of 2G (also known as 2.5G) added packet data services. Nowadays, 5G data services dominate the wireless communication systems [5]. Table 1.1 summarizes the evolution of the wireless mobile communications systems over time, and shows the main technologies used in each system [2][3][4][5]. While the cellular mobile communication systems were developing, other types of wireless networks were also being developed. These data-oriented networks are listed in Table 1.2 [6]; namely Wi-Fi, Bluetooth, Zigbee and WiMAX [6]. Wi-Fi is a wireless local area network that is oriented towards low cost, small distance and high data rate. Bluetooth is oriented towards low power, small distance, low data rate and low-cost peer-to-peer networks. Zigbee is an industrial ad-hoc wireless sensor network that is designed for extremely low power and low data rate and very long battery life. WiMAX is a metropolitan area network that is intended for fixed or low mobility data applications and Internet services. WiMAX can probably be used to provide Internet service in isolated areas. Currently, new wireless devices, such as laptop computers, smart phones and hand-held tablets have access to at least two of the above-mentioned wireless networks, therefore, they are multihomed devices. Multihoming is when the com- munication terminal has multiple network interfaces available for transmission [7]. By default, the device connects to one of the wireless net...
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Related to Evolution of Wireless Systems

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  • Out-of-Network Services We Cover the services of Non-Participating Providers. See the Schedule of Benefits section of this Contract for the Non-Participating Provider services that are Covered. In any case where benefits are limited to a certain number of days or visits, such limits apply in the aggregate to in-network and out-of-network services.

  • Telemedicine Services This plan covers clinically appropriate telemedicine services when the service is provided via remote access through an on-line service or other interactive audio and video telecommunications system in accordance with R.I. General Law § 27-81-1. Clinically appropriate telemedicine services may be obtained from a network provider, and from our designated telemedicine service provider. When you seek telemedicine services from our designated telemedicine service provider, the amount you pay is listed in the Summary of Medical Benefits. When you receive a covered healthcare service from a network provider via remote access, the amount you pay depends on the covered healthcare service you receive, as indicated in the Summary of Medical Benefits. For information about telemedicine services, our designated telemedicine service provider, and how to access telemedicine services, please visit our website or contact our Customer Service Department.

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  • Beta Services From time to time, We may invite You to try Beta Services at no charge. You may accept or decline any such trial in Your sole discretion. Beta Services will be clearly designated as beta, pilot, limited release, developer preview, non-production, evaluation or by a description of similar import. Beta Services are for evaluation purposes and not for production use, are not considered “Services” under this Agreement, are not supported, and may be subject to additional terms. Unless otherwise stated, any Beta Services trial period will expire upon the earlier of one year from the trial start date or the date that a version of the Beta Services becomes generally available. We may discontinue Beta Services at any time in Our sole discretion and may never make them generally available. We will have no liability for any harm or damage arising out of or in connection with a Beta Service.

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