212 results about "Radio relay" patented technology

Disclosed is a lens antenna comprising a dielectric lens consisting of a collimating part and an extension part, and an antenna element. The extension part of the lens comprises a substantially flat surface crossed by the axis of the collimating part, and the antenna element is rigidly fixed on the surface. The antenna element is formed by a hollow waveguide and comprises a dielectric insert with one end thereof adjacent to said surface; the size of the radiating opening of the waveguide is determined by the predefined width of the main beam and by side lobe levels of the radiation pattern of the lens antenna. The technical result of the invention is an increase in realized gain value due to the use of a waveguide antenna element with a dielectric insert, which provides impedance matching in a wide frequency bandwidth. The present invention can be used in radio-relay point-to-point communication systems, e.g. for forming backhaul networks of cellular mobile communication, in car radars and other radars, in microwave RF tags, in local and personal communication systems, in satellite and intersatellite communication systems, etc.

The airborne radio-relay system includes a network control station, at least one ground station, airborne cluster controller relay stations, and one or more non-airborne stations, which may be mobile. The network control station accesses a database providing real-time four dimensional position information regarding air stations in the national and international airspace, and dynamically designates and redesignates particular airborne stations to repeat traffic in response to changing air traffic patterns so that concentric rings of overlapping relay stations are maintained. Transmitting stations use time division duplex techniques to transfer traffic, which includes packet switched data communications traffic.

A radio relay station apparatus and a mobile terminal apparatus that, even if a radio relay station apparatus is provided, can reduce the amount of interference from the radio relay station apparatus and increase the throughput, are provided. The radio relay station apparatus of the present invention decides the number of mobile terminal apparatuses under the subject cell and controls transmission power based on this number of mobile terminal apparatuses, or measures the received power of the signal from another radio relay station apparatus or a radio base station apparatus and controls transmission power based on this received power.

This invention provides a radio relay device with a small size and reduced cost which can prevent collision of communication data when the communication data are relayed in a plurality of radio networks.

The radio relay device relays the communication data between a parent device and a child device of a cordless telephone. The radio relay device includes a synchronization timing detector 16 for detecting a synchronization timing with the transmission of the parent device when relaying a packet transmitted from the parent device to the child device of a different radio network (piconet) and a timing correcting value buffer 20 for storing a correcting value computed from a difference between the synchronization timing and a clock in a bit counter 19. When the radio relay device relays the packet from the parent device to the child device, it communicates with the child device at the timing corrected on the basis of the correcting value extracted from the timing correcting value buffer 20.

A radio base station device comprises: a preamble signal receiving unit (15) that receives a RACH preamble signal transmitted from a radio terminal device; a reception notice receiving unit (16) that receives, from a radio relay station device, a reception notice indicating that the radio relay station device has received the RACH preamble signal; and a response signal transmitting unit (18) which, when an identifier (RA-ID) of the RACH preamble signal transmitted from the radio terminal device matches an identifier comprised in the preamble reception notice transmitted from the radio relay station device, permits the use of an identifier by the radio relay station device and transmits, to the radio terminal device, a RACH response signal (RACH Response) comprising a cell identifier (Cell ID) of a cell managed by the radio relay station device permitted to use the identifier. Accordingly, the latency when establishing a connection can be reduced.

A different resource is allocated to each of a terminal and a relay station as a resource for the communication with a base station. A radio base station device (1) provided in the base station includes: a determination unit (7) which determines whether or not relaying of a random access preamble is performed based on the resource information included in the random access preamble; and a response generating unit (10) which generates a random access response to which relay flag information is attached. When the random access response with the relay flag information attached is transmitted from the base station to the terminal, the control of the transmission power of an RRC connection request is performed at the terminal based on the relay flag information. This allows for the suppression of increase in the delay before the establishment of RRC connection, and thereby a radio base station device which improves the utilization effect of resources is provided.

A radio relay apparatus and an operating method therefor are provided.

The radio relay apparatus that relays a communication signal between a base station and a terminal includes a donor unit that transmits and receives a radio frequency signal to and from the base station, and at least one service unit that transmits and receives an analog transmission signal to and from the donor unit, and transmits and receives the radio frequency signal to and from the terminal. In the analog transmission signal, an intermediate frequency signal into which the radio frequency signal is converted and a time synchronization signal extracted from the intermediate frequency signal are combined. The time synchronization signal is used by the donor unit and the at least one service unit for time division duplex communication (TDD) synchronization control.

A channel capacity is increased by using MIMO (multiple input multiple output) radio relaying system.

A transmission is made from a transmitter 10 using a first antenna 11₁ and a second antenna 11₂ having polarization characteristics which are orthogonalized to each other. A reception is made in a repeater 20₁ using reception antennas 21₁ and 21₂ each having the same polarization characteristic as the first and the second antenna 11₁ and 11₂, respectively. Each signal received by the first and the second reception antenna 21₁ and 21₂, respectively, is passed through loop interference suppressors 27₁ and 27₂, respectively, and through amplifiers 24₁ and 24₂, respectively, to be transmitted from the first and the second transmission antenna 21₁ and 21₂ having the same polarization characteristics as the second and the first antenna 11₂ and 11₁, respectively. A reception is made in a receiver 30 by antennas 31₂ and 31₄ having the same polarization characteristic as the first antenna 11₁, and the reception is also made by antennas 31₁ and 31₃ having the same polarization characteristic as the second antenna 11₂. These received signals are subject to a signal separation processing in MIMO equalizer 32.

This invention provides a base station, relay stations, a radio relay communication system and a method, in which, the radio relay communication system includes a base station and relay stations, and the base station is used in distributing physical resources to relay stations and terminals controlled by them, setting up radio links with the relay stations to communicate with them, the relay stations are used in communicating with the base station via the links for transferring down-line service sent by the base station and up-line service sent by terminals.

A data transmission method and apparatus using a multi-point cooperative transmission for a backhaul link transmission of a relay communication system. A data transmission method of a base station in a radio relay communication system include: obtaining, by a first BS, first radio resource information scheduled by a neighbor BS with respect to a first relay node (RN) located within the coverage of the first BS; when the first BS has data to be transmitted to the first RN, scheduling the data of the first BS on first radio resource allocated by the neighbor BS; and transmitting, by the first BS, the data of the first BS on the first BS, wherein the first RN is located within an overlapping cell coverage between the first BS and the neighbor BS. Thus, backhaul link transmission efficiency between the BS and the RN in the relay communication system can be improved and an inter-cell interference with respect to a backhaul link can be reduced.

Provided is a radio relay station (100) which relays data transmitted and received by a radio base station (200) and a radio terminal (300) in a radio communication system which employs the TDD scheme. The radio relay station (100) receives data from the radio base station (200) during a downlink subframe period (t1) and transmits data to the radio base station (200) during an uplink subframe period (t2). The radio relay station (100) sets a remote side transmission period (P1) for transmitting data to the radio terminal (300) in the uplink subframe period (t2) and sets a remote side reception period (P2) for receiving data from the radio terminal (300) in the downlink subframe period (t1).

A disclosed radio relay apparatus receives signals from a transmitter via multiple receive antennas and transmits relay signals derived from the received signals to a receiver via multiple transmit antennas. The apparatus includes a channel estimation unit configured to estimate a forward channel matrix H₁ representing radio channel characteristics between the transmitter and the radio relay apparatus and a loop channel matrix G representing interference occurring in the relay signals due to concurrently transmitting and receiving signals at the radio relay apparatus, a weight optimization unit configured to derive a canceling matrix C through iterative operations using the forward channel matrix H₁, the loop channel matrix G and a backward channel matrix H₂ representing radio channel characteristics between the radio relay apparatus and the receiver, and a feedback compensation unit configured to subtract a signal weighted in accordance with the canceling matrix C in a feedback path from a relay signal in a main signal path to adjust the relay signal.

A multicarrier radio communication system includes a first mobile station located at a position where it is possible to directly communicate with the base station and to communicate with a radio relay station, and a second mobile station located at a position where it is impossible to directly communicate with the base station and it is possible to communicate with the radio relay station. For allocating subcarriers to signals, the base station determines an order of priority for signals destined for mobile stations on the basis of whether each mobile station is the first mobile station or not. The radio relay station allocates subcarriers to the signals, independently of subcarrier allocation made at the base station. For allocating subcarriers, the radio relay station determines an order of priority for signals on the basis of whether each mobile station is the first mobile station or not.

A radio communication system for preventing transmission and receiving data from colliding with each other in radio relay communication. The radio communication system includes a plurality of radio base stations each having a scheduler for arranging a schedule of assignment of a slot into which data is to be inserted in a radio frame, a terminal for performing communication with at least one of the radio base stations through a connection, and a relay station for performing relay forwarding of the radio frame exchanged through the connection, the relay station including a scheduler control section for giving an instruction of the schedule to the scheduler. The scheduler control section gives the instruction to the scheduler so as not to generate duplicate slot assignment, in which the whole or a part of data is assigned to the same slot in radio frames sent at the same timing.

Correct reception of messages and data by a mobile station or radio base station is enabled in a planned timing by adjusting a receiving or transmit timing in consideration of a time (an occurrence of a time lag) required for relay processing in a radio relay station within a radio communication system. For that purpose, time lag information related to a relay delay due to relay processing in theradio relay station is set to the radio base, the receiving timing of the mobile station is determined based on the time lag information, and the transmit timing of the radio base station 1 or the receiving timing of the mobile station is controlled according to the determined receiving timing.

An apparatus and method is provided for identifying unauthorized access to a vehicle having a keyless-passive entry system. An interrogation signal is broadcast from a vehicle based transmission device. The interrogation signal includes a first pulse transmitted at a first amplitude and a second pulse transmitted at a second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold. The interrogation signal is received by a portable communication device. A determination is made whether the second amplitude of the second pulse is greater than the first amplitude of the first pulse by a predetermined difference threshold. A determination is made that the interrogation signal is an authorized interrogation signal in response to the determination that the interrogation signal includes the first pulse transmitted at the first amplitude following by the second pulse transmitted at the second amplitude where the second amplitude is greater than the first amplitude by at least a predetermined difference threshold.

Methods and apparatus for providing a Tactical Radio Relay System. One embodiment of the invention includes a constellation of miniature radio relays. These relays may be deployed on buildings or structures to provide a temporary telecommunications system that is capable of communicating with a base station or with mobile terminals. In an alternative embodiment, the relays include parachutes made from thin film batteries, and may be dropped over a target communications zone from an airborne platform.

A radio communications system having a radio base station and a radio relay station is disclosed. A terminal performs radio communications through a link with the radio base station or a link with the radio base station via the radio relay station. The radio base station includes an antenna gain pattern switching part configured to switch between an omnidirectional antenna gain pattern and an adaptive array antenna gain pattern forming a beam; and a control part configured to direct the beam to the terminal in one of an extended service area covered by the adaptive array antenna gain pattern outside a regular service area covered by the omnidirectional antenna gain pattern and the service area of the radio relay station by causing the antenna gain pattern switching part to switch to the adaptive array antenna gain pattern.

Disclosed is a beam steerable communication apparatus comprising a focusing element with a focal plane, a plurality of antenna elements disposed on the focal plane of the focusing element, a beamforming network which has a plurality of antenna ports and a plurality of beamforming ports, at least one radio frequency transceiver capable to control the phase of carrier frequency signals on its independent outputs, and a baseband modem, wherein each antenna port of the beamforming network is coupled to at least one antenna element, each beamforming port of the beamforming network is coupled to an independent transceiver output, and the phase distribution law formed on the beamforming ports is determined by a baseband modem control commands to the transceivers, said phase distribution law is to combine or distribute signal power on all beamforming ports from or to at least one antenna port of the beamforming network, wherein each radio frequency transceiver includes at least a phase shifter, a Tx/Rx switch, LNA, PA, up and down-conversion mixers, LO generation circuit, receive power combining and transmit power distribution schemes. The technical result of the invention is in the capability of providing efficient beam steering with high gain antennas with all the prospect features of phased antenna arrays, such as the ability to combine/distribute signal power between several RF amplifiers, thus, facilitating linearity requirements and increasing an output power of a transmitter. The present invention can be used, without limitations, in radio relay point-to-point communication systems, e.g. for forming backhaul networks of cellular mobile communication, in car radars and other radars, in local and personal communication systems, in satellite and intersatellite communication systems, etc.