최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0236413 (1994-04-29) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 400 인용 특허 : 0 |
A hierarchical communication system is described in which two wireless local area networks exhibiting substantially different characteristics are employed to link inherently portable or mobile computer devices. A series of radio base stations make up a infrastructure network. The infrastructure netw
A hierarchical communication system is described in which two wireless local area networks exhibiting substantially different characteristics are employed to link inherently portable or mobile computer devices. A series of radio base stations make up a infrastructure network. The infrastructure network and at least one portable computer device make up the first local area network. The communication on the first local area network is accomplished by spread spectrum frequency hopping communication. A second local area network allows for radio communication between a portable computer device and peripheral devices with built-in transceivers utilized by the portable computer device. The communication in each local area network is controlled by a reservation access communication protocol. The communication protocol facilitates frequency hopping synchronization and supports adaptive data rate selection based upon the quality of communication on the communication channel. The communication protocol prevents interference between communication on the first local area network and communication on the second local area network. In a premises LAN, a series of radio base stations and a backbone LAN make up an infrastructure network. The infrastructure network and at least one mobile computing device make up a higher-power LAN, utilizing a frequency hopping protocol. A lower-power LAN allows for radio communication between a mobile computing device and peripheral devices, utilizing a single-frequency spread spectrum protocol. A vehicular LAN provides for short-range communication between a vehicle terminal and a portable terminal. When out of direct RF range of the premises LAN, the vehicle terminal maintains indirect communication when necessary with the premises LAN via one of several alternate RF channels. A microprocessor, located inside radio units which participate in multiple LAN\s, selects the appropriate protocol, frequency band and power level for communicating through the network.
A hierarchal communication system for linking portable and mobile computer devices, comprising: a first local area network, said first local area network including an infrastructure network comprising at least two radio base stations wherein said radio base stations are interconnected by at least on
A hierarchal communication system for linking portable and mobile computer devices, comprising: a first local area network, said first local area network including an infrastructure network comprising at least two radio base stations wherein said radio base stations are interconnected by at least one of wired and wireless communication, and said first local area network further including at least one of said portable and mobile computer devices; first communication means for controlling communication between said portable and mobile computer devices and said infrastructure network; a second local area network, said second local area network including one or more peripheral devices and at least one of said portable and mobile computer devices; and second communication means for controlling communication between said peripheral devices and at least one of said portable and mobile computer devices.
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