44results about How to "Limit transmission power" patented technology

Disclosed are a system and method for controlling transmission power in a wireless local area network (WLAN), and more particularly, a system and method for controlling transmission power in a WLAN that are capable of providing a WLAN service to terminals outside a service area by controlling the transmission power in the WLAN. Thus, link margin data of a station positioned at a hidden node of the WLAN is received from another station positioned in a service area, and the received link margin data is compared with preset link margin data for control of the transmission power in the WLAN.

A method and apparatus of controlling uplink transmit power is provided. An estimated path-loss value for each of downlink signals from a control base station and one or more neighboring base stations is calculated. A signal path-loss value by using the calculated plurality of estimated path-loss values is obtained. An open-loop power control parameter by using the signal path-loss value is obtained. Uplink power can be controlled by considering cooperative communication of a plurality of base stations in a multi-cell cooperative radio communication system.

In order to appropriately control transmit power of a common channel for an MBMS (Multimedia Broadcast / Multicast Service) so as not to become excessive, a mobile station 1 transmits a TPC command for an S-CCPCH to a base station through an uplink DPCH1 and a mobile station 2 transmits a TPC command for an S-CCPCH to the base station through an uplink DPCH2. When either one of the TPC command for the S-CCPCH transmitted from the mobile station 1 and the TPC command for the S-CCPCH transmitted from the mobile station 2 is a TPC command instructing “Up”, the base station increases transmit power of the downlink S-CCPCH and decreases transmit power of the downlink S-CCPCH when both TPC commands instruct “Down”.

Provided is a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a method for transmitting data, including: performing, by a Long-Term Evolution (LTE) equipment, Clear Channel Assessment (CCA) in one channel of a unlicensed band; and determining, by the LTE equipment, whether the channel can be occupied according to a CCA measurement value in the channel, and determining a data transmission parameter if it is determined that the channel can be occupied. The present disclosure also provides a corresponding apparatus. According to the method and apparatus provided by the present disclosure, the transmission power of the apparatus on the unlicensed band may be controlled, channel seizing opportunity is increased and effective coexistence is ensured.

In a system of the present invention, the amount of cell-edge band is limited. In addition, the upper limit of the amount of cell-edge band in each cell is set for limiting the amount of cell-edge band based on the upper limit. The number of cell-edge MSs is also limited. In addition, the upper limit of the number of cell-edge MSs in each cell is set for limiting the number of cell-edge MSs based on the upper limit.

In a transmission signal generating circuit, spreading processing circuits spread transmission data to output spread transmission signals. Power class selecting circuits categorize the spread transmission signals into power classes. First adding circuits add / combine the spread transmission signals. Multipliers adjust transmission powers of the spread transmission signals for the respective power classes. A second adding circuit adds / combines the spread transmission signals. A total transmission power measuring means measures a total transmission power. A nonlinear quantization means nonlinearly quantizes the total transmission power and outputs a power level. A power limitation control memory outputs a multiplication coefficient for a power class for which transmission power control is permitted. Selectors select, when transmission power control is permitted for the power class, a multiplication coefficient from the power limitation control memory and output it to the multiplier corresponding to the power class, and select, when transmission power control is inhibited for the power class, a multiplication coefficient formed from a predetermined fixed value, and output it to the multiplier corresponding the power class. A radio base station communication apparatus is also disclosed.

Provided are a time synchronization method and a frequency offset estimation method using the same in an OFDM system. The time synchronization method using a preamble transmitted from a transmitter to a receiver in the OFDM communication network includes the steps of: a) calculating a moving sum of a first sequence and a second sequence obtained by a product of neighboring elements in a received signal when the received signal containing a preamble is received from the transmitter; b) estimating a location of the received signal corresponding to the moving sum having a maximum value; and c) acquiring a time synchronization with respect to the received signal, based on the estimated location, wherein the first sequence is obtained from a product of neighboring elements in the preamble and a correlation value obtained by correlating another sequence with the first sequence is smaller than a predetermined value.

A distress beacon and associated detection system for water borne activities are disclosed. The beacon includes a signal transmitter, an antenna and an actuator arranged to activate the signal transmitter upon actuation, the signal transmitter being arranged, upon being activated, to periodically output a signal pulse via the antenna, the signal pulse including an identifier associated with the distress beacon

Apparatus for boosting the signal between a cell phone (14) and a cell site (16), which includes an amplifier (64) that continually operates at a fixed gain. A power detector (72) controls an attenuator (62) that can be switched to pass the amplified signal through an attenuator (74) of moderate resistance, or through an attenuator (60) of zero resistance so the power output is boosted within the limits allowed under cell phone system standards.

The present invention provides a method and a device for line initialization. In the method, first, a first precoding matrix needed by a first part of subcarriers is acquired in a downstream direction, and then multiple data signals of all data signals that need to be sent in an initialization process are sent by using only the first part of subcarriers; afterward, a second precoding matrix needed by at least a second part of subcarriers of all available subcarriers is acquired, and remaining data signals of all the data signals exclusive of the multiple data signals are sent by using the at least second part of subcarriers to complete line initialization. By using the foregoing manner, the present invention can cancel crosstalk between lines while completing line initialization, and does not easily cause transmit power to exceed a limit.

A transmission output restricting method and apparatus of a portable terminal includes a radio frequency (RF) unit to detect a transmission power reflected based on a degree of mismatching of an antenna when a transmission power is emitted via the antenna, and to measure a transmission power increased due to the reflected transmission power caused by a human contact to the antenna, and a controller to control an output of the transmission power by restricting the output of the transmission power when the transmission power measured by the RF unit is greater than or equal to a predetermined value.

A mobile wireless terminal (MWT) includes multiple wireless modems. The multiple modems have their respective transmit outputs combined to produce an aggregate transmit output. The multiple modems can concurrently transmit data in a reverse link direction and receive data in a forward link direction. The MWT is constrained to operate under an aggregate transmit power limit. Each of the multiple modems has an individual transmit limit related to the aggregate transmit power limit. When operating, over-limit ones of the multiple modems are deactivated and then reactivated to keep an aggregate transmit power of all of the modems below the aggregate limit, and to maximize data through-put on the forward and reverse links.

In a mobile communication system, interference power from adjacent cells is effectively reduced and transmission power is limited. A transmission loss estimation unit 202 and a transmission power estimation unit 204 estimate transmission power necessary for transmission of a downstream signal. According to an upstream signal from each of plurality of mobile terminal devices to a base station, a grouping unit 206 divides a plurality of mobile terminal devices into groups sharing a plurality of wireless resources according to the estimated transmission powers. Downstream signals to be transmitted to mobile terminal devices belonging to each of the groups formed by the grouping means are transmitted simultaneously with each other. Also, priorities are set for the plurality of wireless resources and the mobile terminal devices belonging to the groups divided by the grouping unit 206 are assigned according to the set priorities. Accordingly, transmission to one of the groups requiring higher transmission power in one of cells adjacent to each other and transmission to one of the groups requiring higher transmission power in another of the cells are performed at different times, thereby reducing interference power received in each cell from the adjacent cells.

The embodiments relate to a docking station for a mobile electronic device. The energy supply and the data exchange between the docking station and the mobile electronic device is carried out in a wireless manner. The wireless energy supply and the wireless data connection are configured to each other. The initialization process for connecting the mobile electronic device to the docking station may be carried out in a fully automatic manner.

A mobile wireless terminal (MWT) includes multiple wireless modems. The multiple modems have their respective transmit outputs combined to produce an aggregate transmit output. The multiple modems can concurrently transmit data in a reverse link direction and receive data in a forward link direction. The MWT is constrained to operate under an aggregate transmit power limit. Each of the multiple modems has an individual transmit limit related to the aggregate transmit power limit. An MWT controller controls the total number of modems that transmit data at any given time, based on an average energy-per-transmitted bit, or alternatively, individual energy-per-transmitted bits of the modems.

Node-B transmits a power profile of each frequency of transmission data as a step function to a UE. Each UE measures the amount of interference of a received signal, evaluates SINR over the entire frequency band with the power of the received signal, and transmits the evaluation result to Node-B. Node-B evaluates the interference profile in Node-B from the information about the SINR transmitted from the UE and the power of the transmission signal, and determines the frequency profile of the power of the signal transmitted to the UE.

A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section.

A wireless communication terminal includes first and second case members coupled together by a coupling portion so that the positional relation therebetween can be changed, an external wireless communication antenna provided at the first case member, an external wireless communication control portion mainly controlling external wireless communication carried out through the external wireless communication antenna, a first internal wireless communication antenna, a first internal wireless communication control portion controlling internal wireless communication carried out through the first internal wireless communication antenna, a display part provided at the second case member, a second internal wireless communication antenna, a second internal wireless communication control portion controlling internal wireless communication carried out through the second internal wireless communication antenna, and an output power control portion controlling the output power of waves transmitted by the internal wireless communication based on the timing of transmitting waves transmitted through the external wireless communication antenna.

Embodiments of the present invention provide a capacity station activation method and system. The method includes: A coverage station sends activation control information to a capacity station, where the activation control information is used to enable the capacity station to send a pilot signal to a user in a power increasing manner; receives a measurement result of measuring the pilot signal by the user; determines, according to the measurement result, a capacity station that needs to be activated to meet a system requirement; and sends activation information to a determined capacity station that needs to be activated to activate the capacity station. With the capacity station activation method and system in the embodiments of the present invention, a capacity station that needs to be activated can be determined more accurately, and furthermore, transmit power of an activated capacity station can be controlled, thereby reducing energy consumption of a whole system.

A wireless communication terminal includes first and second case members coupled together by a coupling portion so that the positional relation therebetween can be changed, an external wireless communication antenna provided at the first case member, an external wireless communication control portion mainly controlling external wireless communication carried out through the external wireless communication antenna, a first internal wireless communication antenna, a first internal wireless communication control portion controlling internal wireless communication carried out through the first internal wireless communication antenna, a display part provided at the second case member, a second internal wireless communication antenna, a second internal wireless communication control portion controlling internal wireless communication carried out through the second internal wireless communication antenna, and an output power control portion controlling the output power of waves transmitted by the internal wireless communication based on the timing of transmitting waves transmitted through the external wireless communication antenna.

A signal modulator that can control transmission power if level adjustment of a continuous signal from an oscillator is executed is provided. A pulse generator of one example of a signal modulator includes an oscillator, a control signal generator, a multiplier, a filter, and a control section. The oscillator and the multiplier are active circuits formed of active elements. A continuous signal is output from the oscillator and is input to the multiplier and the multiplier intermittently operates by a control signal output from the control signal generator, whereby a pulse signal is generated and the power level is easily adjusted by a signal from the control section.

The present invention provides a method for controlling transmission power of an uplink control channel carried out by an user equipment in a wireless communication system and an user equipment using the method. The method comprises: receiving uplink power control information; and determining transmission power of an uplink control channel based on the uplink power control information, wherein the uplink power control information includes a power offset value determined according to whether transmit diversity is applied when the uplink control channel is transmitted through a channel selection scheme.

An electronic device is provided. The electronic device includes at least one wireless communication circuit, a processor, and a memory. The memory may store one or more instructions that, when executed, cause the processor to connect with a first cell of a master cell group (MCG) and a second cell of a secondary cell group (SCG) using the at least one wireless communication circuit, detect occurrence of a packet based mobile originated call, release the connection with the second cell when a type of the mobile originated call is an emergency call, and perform the mobile originated call through the first cell.

A method for controlling DSL transmission power includes: determining a group to which a line belongs, and selecting a representative line from each group to form a line model; obtaining a crosstalk model of the line model; obtaining Transmit Power Spectrum Density (TxPSD) of each representative line in the line model according to the crosstalk model, and converting the TxPSD into a spectrum control parameter; and enhancing the line rate according to the spectrum control parameter. An apparatus for controlling DSL transmission power is also disclosed. Through the method, the transmission power of the band that incurs serious line crosstalk is restricted, and the line that incurs serious crosstalk can achieve higher transmission rates. Therefore, the adverse impact from the crosstalk between xDSL lines is reduced, and the line works in the optimum state.