1115results about How to "Increase transmit power" patented technology

A circularly polarized patch antenna uses a square quarter-wavelength conductive plate, spaced away from a slightly larger backing conductor. Excitation uses a coaxial feed stem pair, whereof respective inner conductors join the patch at orthogonal locations on a reference circle, and outer conductors intrude past points of joining to the backing conductor to establish gaps that interact with patch and backing conductor size and spacing to jointly establish terminal impedance. A parasitic element in the propagation path broadens bandwidth, while a frame behind serves to define a cavity reflector. A power divider behind the frame converts a single applied broadcast signal into two equal signals with orthogonal phase, which signals are delivered to the feed stems with equal-length coaxial lines.

A portable terminal monitors a signal level of a short-range wireless signal from a wireless communication apparatus. If the signal level drops so low that a state of connection for short-range wireless communications cannot be maintained between the two apparatuses, use of predetermined functions of the portable terminal is limited. A short-range wireless communication facility of the portable terminal and the wireless communication apparatus move into a particular operation mode if communications do not occur therebetween at least for a predetermined time period. In monitoring the signal level of the wireless signal from the wireless communication apparatus in the particular operation mode, the portable terminal reduces a response speed at which to detect a signal level change. This causes the wireless communication apparatus to delay issuing a request for an increase in transmission power, thereby reducing unevenness of the working distance at which to alert a user to the unusual distance traveled between the two apparatuses or beyond which to limit the use of some functions of the portable terminal.

The present invention involves apparatus and methods to perform wireless terminal transmission power control. The invention uses novel and highly efficient methods to: convey power control information, specify power control level adjustments, recognize power control information, limit interference in the power control signaling, and recognize corrupted power control signaling, thus conserving wireless terminal energy and minimizing power control signaling and associated bandwidth. Base stations send analog power control command signals, with a continuous range of control levels, to wireless terminals for transmission power adjustments. Power control signals include two components which can be used to convey information, e.g., power control commands, signal quality, device identity information. For zero power adjustment, the control component signal is not transmitted. For a non-zero adjustment, power control signals are sent using control ranges and limits, known to the base station and wireless terminal, with the scaling adjusted or synchronized based upon feedback information.

The present invention involves apparatus and methods to perform wireless terminal transmission power control. The invention uses novel and highly efficient methods to: convey power control information, specify power control level adjustments, recognize power control information, limit interference in the power control signaling, and recognize corrupted power control signaling, thus conserving wireless terminal energy and minimizing power control signaling and associated bandwidth. Base stations send analog power control command signals, with a continuous range of control levels, to wireless terminals for transmission power adjustments. Power control signals include two components which can be used to convey information, e.g., power control commands, signal quality, device identity information. For zero power adjustment, the control component signal is not transmitted. For a non-zero adjustment, power control signals are sent using control ranges and limits, known to the base station and wireless terminal, with the scaling adjusted or synchronized based upon feedback information.

A mobile station in a mobile communications system directs a base station to raise a transmission power using identification data, when a reception quality measured by the mobile station is lower than a desired reception quality. The mobile station also directs the base station to lower the transmission power using identification data, when the reception quality measured by the mobile station is higher than the desired reception quality.

The embodiment of the invention relates to the technical field of wireless communication, particularly relates to a pilot signal transmission method, a signal measuring method, a signal measuring system, a piece of pilot signal transmission equipment and a piece of signal measuring equipment, and aims to solve the problem that each antenna unit transmits one pilot signal to result in very low transmission power of each antenna unit, and user equipment is high in complexity when the number of the antenna units is large in the prior art. The pilot signal transmission method of the embodiment of the invention comprises the step in which network side equipment sends determined CSI feedback configurations to user equipment, wherein one CSI feedback configuration corresponds to one CSI-RS resource, and a pilot signal corresponding to each port of one CSI-RS resource is sent through a set of antenna units corresponding to the port. By adopting the scheme provided by the embodiment of the invention, the transmission power of the antenna units can be increased to enable the user equipment to carry out signal measurement correctly, the performance of data transmission is improved, and the complexity of the user equipment is reduced when the number of the antenna units is large.

An open-loop power controller of a transmission power control apparatus investigates whether a dedicated control channel DCCH and a synchronization channel SCH overlap. If the channels overlap, the open-loop power controller suspends ordinary open-loop power control processing, increases a target SIR by a satisfactory level and indicates this to a closed-loop power controller. The closed-loop power controller maintains the indicated target SIR and executes closed-loop transmission power control processing based upon the target SIR. The open-loop power controller resumes ordinary open-loop transmission power control processing after DCCH reception ends.

The present invention discloses a cell handoff method and a user equipment based on a TDD system. The method includes: step A. a UE measures received pilot channels of a source cell and a neighboring cell according to a measurement control message and reports measurement result to a RNC; step B. the RNC, determines whether a target cell to be subject to a cell handoff process has available resources at a time slot different from that of the source cell and if yes, transmits a cell handoff command to the UE, allocates available resources for the UE in the target cell and transmits traffic carrier data of the UE to the source cell and the target cell respectively; and step C. after receiving the cell handoff command, the UE communicates with the source cell and the target cell at a same frame and at same time according to the allocated available resources. According to the handoff method of the present invention, UE can more reliably receive the handoff control command transmitted by the RNC and during the handoff process, the transmission power and interference are reduced so that the reliable handoff of a UE is guaranteed and the system performance is improved.

To transmit information with the aid of a transmit signal exhibiting a number of frequency-specific subcarriers from a first unit to a second unit via a transmission medium, the frequency-selective transmission characteristics of the transmission medium are determined in the first unit and then the subcarriers of the transmit signal are adapted to the transmission characteristics determined. All subcarriers of the transmit signal can be advantageously modulated with the same number of modulation levels as a result of which maximum utilization of the transmission resources of the transmission medium is achieved.

A wireless terminal using OFDM signaling supporting both terrestrial and satellite base station connectivity operates using conventional access probe signaling in a first mode of operation to establish a timing synchronized wireless link with a terrestrial base station. In a second mode of operation, used to establish a timing synchronized wireless link with a satellite base station, a slightly modified access protocol is employed. The round trip signaling time and timing ambiguity between a wireless terminal and a satellite base station is substantially greater than with a terrestrial base station. The modified access protocol uses coding of access probe signals to uniquely identify a superslot index within a beaconslot. The modified protocol uses multiple access probes with different timing offsets to further resolve timing ambiguity and allows the satellite base station access monitoring interval to remain small in duration. Terrestrial base station location / connection information is used to estimate initial timing.

A method and system are presented for providing satellite communications coverage for a geographical area involving operating a plurality of gateways including a first gateway and a second gateway, wherein the first gateway is configured to utilize at least one first spot beam associated with at least one first coverage area within the geographic area to provide relayed satellite communications to a plurality of first subscriber terminals located in the at least one first coverage area, wherein the second gateway is configured to utilize at least one second spot beam associated with at least one second coverage area within the geographic area to provide relayed satellite communications to a plurality of second subscriber terminals located in the at least one second coverage area, and upon a failure condition associated with the at least one first spot beam, expanding the at least one second coverage area to include a portion of the at least one first coverage area, to provide relayed satellite communications to at least some of the first subscriber terminals without utilizing the at least one first spot beam.

A photonic crystal light emitting diode (“PXLED”) is provided. The PXLED includes a periodic structure, such as a lattice of holes, formed in the semiconductor layers of an LED. The parameters of the periodic structure are such that the energy of the photons, emitted by the PXLED, lies close to a band edge of the band structure of the periodic structure. Metal electrode layers have a strong influence on the efficiency of the PXLEDs. Also, PXLEDs formed from GaN have a low surface recombination velocity and hence a high efficiency. The PXLEDs are formed with novel fabrication techniques, such as the epitaxial lateral overgrowth technique over a patterned masking layer, yielding semiconductor layers with low defect density. Inverting the PXLED to expose the pattern of the masking layer or using the Talbot effect to create an aligned second patterned masking layer allows the formation of PXLEDs with low defect density.

The present invention provides a method of controlling transmission power including the steps of: increasing transmission power immediately after a data transmission without waiting for a response signal to be received indicating a result of receiving the transmitted data; if the response signal received reveals that the transmitted data has been unsuccessfully received, retransmitting the same data and also holding transmission power applied when the data is retransmitted; if the response signal received reveals that the transmitted data has been successfully received and data previously transmitted has also been successfully received, reducing transmission power for a subsequent data transmission by a predetermined amount; and if the response signal received reveals that the data transmitted has been successfully received and data previously transmitted has been unsuccessfully received, setting transmission power for the subsequent data transmission depending on the transmission power held being applied when the data was retransmitted.