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2 results about "Radio relay" patented technology
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Radio stations that cannot communicate directly due to distance, terrain or other difficulties sometimes use an intermediate radio relay station to relay the signals. A radio relay receives weak signals and retransmits them, often in a different direction, as a stronger signal. Examples include airborne radio relay, microwave radio relay, and communications satellite. The American Radio Relay League was founded for this purpose but did not change its name when this became a less important part of its work.
Control of a reflective intelligent surface
There is provided techniques for controlling an RIS. The RIS comprises a controller entity and a reflector entity. The reflector entity is associated with configurable reflection properties defining how radio waves that impinge the reflector entity are reflected. The reflection properties are controlled by the controller entity. A method is performed by a network node. The method comprises determining that the RIS to refrain from reflecting signals communicated in radio waves between the network node and a user equipment. The method comprises, in response thereto, providing an indication to the controller entity for the RIS to enter a non-relay mode according to which the reflector entity is to apply a default configuration of the reflection properties.
Owner:TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Methods and system for providing high-speed communication on high-speed railway
ActiveUS12649503B2Particular environment based servicesNetwork topologiesExchange networkRadio relay
The present invention relates to the field of communications, and more particularly to methods and a system for providing high-speed communications on a high-speed railway. The technical result is a better quality communication channel provided by train-to-ground radio relay links. The claimed system for providing high-speed communications on a high-speed railway comprises an internal and an external data exchange network. The internal network unites tail-end radio frequency modules mounted in the rear part of a train and equipped with narrow-band antennae, head-end radio frequency modules mounted in the front part of the train and equipped with narrow-band antennae, and switching equipment capable of processing signals from said modules and of providing network devices connected to said equipment with access to the external data exchange network. The external data exchange network unites base stations equipped with narrow-band antennae, said base stations being capable of establishing communication with the tail-end and head-end radio frequency modules in the train and being arranged in proximity to the railway clearance along the path of travel of the train. The antennae of the base stations and of the radio frequency modules in the train are configured to radiate radio waves in a short millimeter wave band.
Owner:OBSHCHESTVO S OGRANICHENNOJ OTVETSTVENNOSTYU DOK