153 results about "Open loop power control" patented technology

Apparatuses, methods, and systems are disclosed for transmission power control. One method includes receiving a first configuration indicating a plurality of bandwidth parts on a first serving cell and configuration information corresponding to the plurality of bandwidth parts. The configuration information comprises an open-loop power control configuration, a closed loop power control configuration, or a combination thereof corresponding to each bandwidth part of the plurality of bandwidth parts. The method comprises receiving scheduling information for a first uplink transmission on a first bandwidth part of the plurality of bandwidth parts. The method comprises determining a first transmission power for the first uplink transmission based on the configuration information and the scheduling information. The method comprises performing the first uplink transmission with the first transmission power.

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.

A TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) communication system performs power control in a closed-loop power control mode in a data transmission period, but performs the power control using a modified open loop power control method and an open loop power control method as well as the closed-loop power control method in a transmission pause period, thereby to properly set initial transmission power after the end of the transmission pause period.

An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed / mobile wireless system. A preferred system and method comprise measuring signal strength of received interference-free pilot tones transmitted by a base station; determining pathloss according to received power level of pilot tones; and controlling transmit power level of the remote unit by adjusting transmitting channel attenuation according to the pathloss determined in the preceding step. The method may further comprise monitoring at the base station the received signal level of uplink pilot tones; checking if received signal level of uplink pilot tones is outside pre-set limits around the target level at the start of each call; and sending a command to the mobile station over the broadcast channel to increase or decrease the transmitting power level.

The present invention comprises a method and apparatus for continuously, controlling a gain of an amplifier circuit while switching between open-loop and closed-loop power control. A control circuit controls the gain of the amplifier circuit during open-loop and closed-loop power control modes based on selected references. Before the switch from open-loop to closed-loop power control, the control circuit determines a closed-loop reference based on a power measured at the amplifier circuit output before the switch. After the switch, the control circuit controls the gain of the amplifier circuit based on the determined closed-loop reference. Before switching from closed-loop to open-loop power control, the control circuit generates a difference between a current open-loop reference and a previous open-loop reference. After the switch, the control circuit controls the gain of the amplifier circuit based on an open-loop gain control signal generated by applying the difference to a previous closed-loop gain control signal.

A technique for improving open loop power control in spread spectrum telecommunications systems is disclosed. In a preferred embodiment, the technique is realized by transmitting at least one first access channel probe for a first message from a mobile station to a base station, wherein the transmission power level of each access channel probe in the at least one first access channel probe is increased until a base station acknowledgment is received for a specific access channel probe of the at least one first access channel probe at a first transmission power level. The first transmission power level is then stored at the mobile station. At least one second access channel probe for a second message is then transmitted from the mobile station to the base station, wherein the transmission power level of an initial access channel probe of the at least one second access channel probe for the second message is based upon the first transmission power level.

A power-control method base on Downlink Piloting Time Slot (DwPTS) in a mobile communication system. While a terminal is being accessed randomly, the terminal determines the transmitting signal power at Uplink Piloting Time Slot (UpPTS) for open-loop power control by using broadcast information and the measured DwPTS power. While the communications are being maintained, the base station notifies the terminal of the required receiving power, the terminal then calculates the transmitting power for open-loop power control by using the measured DwPTS power, which is taken as the reference transmission power of the uplink channel and compared with the actual transmitting power required by the base station for closed-loop power control; the difference of the comparison is in turn compared with a threshold, if the difference is larger than the threshold, sum of the reference transmission power and the threshold is used as the power to perform transmission, otherwise, the closed-loop power control command is keeping executed. By taking the advantage of the TDD mode in which the uplink and downlink transmissions are, carried out in the same conditions, the method makes full use of open-loop power control which has the merits of being simple and accurate so that complex outer-loop power control is not needed in closed-loop power control, making the RNC simpler and the system more stable. hi addition, since it is the DwPTS power that is measured in the power control, the accuracy of power control is greatly improved.

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.

The present invention comprises a method and apparatus for continuously, controlling a gain of an amplifier circuit while switching between open-loop and closed-loop power control. A control circuit controls the gain of the amplifier circuit during open-loop and closed-loop power control modes based on selected references. Before the switch from open-loop to closed-loop power control, the control circuit determines a closed-loop reference based on a power measured at the amplifier circuit output before the switch. After the switch, the control circuit controls the gain of the amplifier circuit based on the determined closed-loop reference. Before switching from closed-loop to open-loop power control, the control circuit generates a difference between a current open-loop reference and a previous open-loop reference. After the switch, the control circuit controls the gain of the amplifier circuit based on an open-loop gain control signal generated by applying the difference to a previous closed-loop gain control signal.

Systems and methodologies are described that facilitate utilizing power control preambles with closed loop power control techniques in a wireless communication environment. An uplink grant can be transferred over a downlink (e.g., a first uplink grant after uplink inactivity), and a power control preamble can be sent over an uplink in response to the uplink grant. According to an example, transmission of the power control preamble can be explicitly scheduled and / or implicitly scheduled. The power control preamble can be transmitted at a power level determined by an access terminal utilizing an open loop power control mechanism. A base station can analyze the power control preamble and generate a power control command based thereupon to correct the power level employed by the access terminal. The access terminal can thereafter utilize the power control command to adjust the power level for uplink data transmission.

A method and apparatus for efficient open loop power control in a packet data mobile communication system using Frequency Division Multiple Access (FDMA) is disclosed. When a target Signal-to-Interference Ratio (SIR) required for the determination of transmission power using open loop power control is set, influence upon neighboring cells is considered. In other words, when a Mobile Station (MS) is located at a cell boundary and thus induces large interference with its neighboring cells, the target SIR is set low. In the other case, the target SIR is set high. Therefore, by adjusting transmission power according to the position of an MS and a relationship between the MS and the neighboring cells, support for high data rate can be provided to an MS that is located near a Base Station (BS) and interference induced by an MS that is located around a cell boundary can be minimized. In this way, the entire system capacity can also be improved.

An uplink (UL) power control apparatus and method in a broadband wireless communication system are provided. The Mobile Station (MS) includes a power controller for calculating a power compensation value using a last transmit power in a previous closed loop power control when a power control mode is changed to an open loop power control, and determining a transmit power according to the open loop power control using the power compensation value; and a transmitter for adjusting and transmitting the transmit power of a UL signal under control of the power controller.

Disclosed is an apparatus for determining transmit power of an uplink frame transmitted from a subscriber station to a base station and transmitting data in a mobile communication system in which a downlink frame, transmitted from the base station to the subscriber station, and the uplink frame are time division-duplexed (TDD). The apparatus includes a receive power measurement unit for measuring receive power of signals received from the base station; a transmit power controller for determining the transmit power of the uplink frame from the receive power measured by the receive power measurement unit and information related to receptions of an uplink frame, which is received from the base station; and a transmission radio frequency processor for performing radio processing so that the uplink frame is transmitted according to the transmit power determined by the transmit power controller.

The application provides a method for avoiding interference to the cellular communication. The method comprises the following steps: VUE determines TDD uplink / downlink configuration of a VCell according to PSBCH or the pre-configuration of the located region, and then avoids the selection of the resource which is overlapped with the VCell downlink sub-frame or the downlink OFDM symbol, for the PSSCH and / or PSCCH sending according to a corresponding resource selection limiting mechanism; or the VUE determines an open-loop power control parameter according to the pre-configuration or the pre-configuration corresponding to the region; and when the PSBCH or the fact that the VUE is located at the region near the VCell can be successfully detected, computing the sending power of the PSSCH and / or PSCCH by using the open-loop power control parameter, thereby reducing the influence on the downlink receiving in the VCell. Through the method provided by the application, the influence on the cellular communication by the V2X communication can be effectively reduced with a limited complexity.

Disclosed is an apparatus for determining transmit power of an uplink frame transmitted from a subscriber station to a base station and transmitting data in a mobile communication system in which a downlink frame, transmitted from the base station to the subscriber station, and the uplink frame are time division-duplexed (TDD). The apparatus includes a receive power measurement unit for measuring receive power of signals received from the base station; a transmit power controller for determining the transmit power of the uplink frame from the receive power measured by the receive power measurement unit and information related to receptions of an uplink frame, which is received from the base station; and a transmission radio frequency processor for performing radio processing so that the uplink frame is transmitted according to the transmit power determined by the transmit power controller.

Disclosed is an apparatus for determining transmit power of an uplink frame transmitted from a subscriber station to a base station and transmitting data in a mobile communication system in which a downlink frame, transmitted from the base station to the subscriber station, and the uplink frame are time division-duplexed (TDD). The apparatus includes a receive power measurement unit for measuring receive power of signals received from the base station; a transmit power controller for determining the transmit power of the uplink frame from the receive power measured by the receive power measurement unit and information related to receptions of an uplink frame, which is received from the base station; and a transmission radio frequency processor for performing radio processing so that the uplink frame is transmitted according to the transmit power determined by the transmit power controller.

A method and apparatus for determining an efficient and reliable power level for the MS's transmitter for reverse link communications during a rescue procedure to rescue dropped calls quickly and with a high success rate is disclosed. A mobile station's mean rescue transmission output power level is computed by first determining the mobile station's mean receive input power level when the mobile station transmits during a connection rescue procedure. This mean receive input power level is then adjusted using up to four parameters. These four variables include (1) a pre-rescue power delta, (2) a rescue interference delta, (3) a rescue delay compensation value, and (4) a pre-determined value.

A method and apparatus for realizing power control on a control channel including measuring the interval between the current control channel transmission and the last control channel transmission; comparing the measured interval with a preset threshold, and if the interval is larger than or equal to the preset threshold, carrying out the current control channel transmission by using the initial transmit power, or controlling the current control channel transmission by using the open loop power control and, otherwise, controlling the current control channel transmission by using the closed loop power control. When the control channel is an uplink control channel, it may be determined whether a compensation for path loss variance should be added based on the closed loop power control according to a related command, so as to enable that the power control can be provided effectively when the control channel transmission is discontinuous.

The invention discloses a control method of uplink power of a long term evolution (LTE) system, comprising open loop power control and closed loop power control. The open loop power control comprises the following steps: three interference thresholds IOT1, IOT2 and IOT3 are preset in a base station, and the interference signal sent by a terminal is periodically detected, wherein IOT1<IOT2<IOT3; when the strength X of the interference signal is larger than IOT1, the base station sends a feedback signal to reduce the uplink power of the terminal, the reduction range is delta TdB, wherein the delta T is an amount associated with the real-time uplink power of the terminal and the distance among the cell base stations. When the method disclosed by the invention is used for controlling the closed loop power, the reduction amplitude of the uplink power is determined by the path difference values from the terminal to the current cell and the disturbed cell as well as a threshold value exceeded by the uplink power, and when the uplink power intensively interferes the adjacent cell, the uplink power can be regulated by using the control method to a proper value in a short time to meet the transmission requirement.

The invention discloses a method, system and equipment for controlling power. The core of the method is that based on information reported from mobile terminal, base station determines up going transmission parameter of mobile terminal; based on up going transmission parameter, base station determines power offset parameter needed to adjust for mobile terminal, and sends down the power offset parameter to the mobile terminal; based on up going transmission parameter measured and calculated, and power offset parameter sent from the base station, mobile terminal carries out power control in open loop. The invention can determines power offset parameter needed to adjust precisely so as to prevent unstable effect of mobile terminal in procedure of controlling power in open loop. Thus, the invention raises quality of channel and stability of system.

A first power control adjustment state g(i) and a second power control adjustment state f(i) are initialized for i=0 to each reflect an open loop power control error. An initial transmit power for a shared uplink channel is computed using full pathloss compensation. The computed initial transmit power depends on a preamble power of a first message sent on an access channel, and the initial transmit power is initialized with the second power control adjustment state f(0). A third message is sent from a transmitter on an uplink shared channel at the initial transmit power. In various implementations, the power for i=0 on the uplink control channel is also initialized similar to the initial transmit power for the third message and using full pathloss compensation, and after the third message (and retransmissions of it), subsequent messages sent on the uplink shared channel are sent at a power that is computed using fractional pathloss compensation.

The present invention discloses a method for implementing power control of the high speed shared control channel and the high speed shared information channel, including: Node B independently setting the initial transmit power of the HS-SCCH with reference to the maximum power of HS-SCCH configured by higher layer and completing the open-loop power control; performing the close-loop power control based on transmit power control TPC command; UE calculating the initial transmit power based on a series of parameters configured by the higher layer and completing the open-loop power control; UE adjusting the close-loop transmit power based on the TPC command carried on HS-SCCH and completing the close-loop power control. Wherein, Node B generates the TPC by taking the high speed shared information channel SNR generated by itself as the target value and the high speed shared information channel SNR measured as the actual value. The present invention can achieve the power control of HS-SCCH and HS-SICH based on the TPC parameters for HS-SICH close-loop control calculated by Node B.

In random access state, terminals decide the transmit power in UpPTS in open loop mode, by using the broadcast information and the DwPTS power measured. In the communication maintenance stage, the base station informs the terminals what is the received power needed by the base station. The terminal calculates the power value in open loop mode by using the DwPTS power measured as the threshold andreference of the transmitting power in up channel. The invention utilizes the same transmission condition in up and down links of TDD duplex mode and exerts the advantages of the simple and accurate of the open loop power control as far as possible so as to raise the accuracy of the power measurement. That is to say the accuracy of the power control is raised.

Apparatus, and an associated method, for controlling the power levels at which an EDGE-modulated signal, or other signal which includes envelope varying-portions, during operation of a communication system. Changes in the power levels of the EDGE-modulated signal are permitted when closed-loop power control is done on nonamplitude-modulated component portions of the signal. Changes in the power levels of the EDGE-modulated signal are prevented by open-loop power control on amplitude-modulated component portion of the signal.

The invention provides an uplink signal sending method. The uplink signal sending method comprises confirming uplink path losses according to pre-defined information, obtaining transmitting power of uplink signals according to the obtained uplink path losses, and sending the uplink signals according to the transmitting power. The invention also provides an uplink signal sending device. According to the uplink signal sending device, the uplink path losses are confirmed in combination with the pre-defined information, the power of the uplink signals is obtained according to the confirmed uplink path losses, the uplink signals are transmitted, different requirements for the transmitting power of the uplink channels under different application scenarios are fully met, the uplink path losses are confirmed by further utilizing CSI-RSs (cell state information reference signals), the capability of open-loop power control is improved, and accurate control of the uplink channels is achieved.

The invention discloses a treatment method of temperature control thermocouple fault of a polysilicon ingot furnace. When the temperature control thermocouple has fault, the closed-loop temperature control of the temperature control thermocouple is converted into open-loop power control to control the heating power. The invention has a realization method that when the temperature control thermocouple is normally working, the temperature characteristic data of the heater are stored for every interval time; when the temperature control thermocouple has fault, the stored temperature characteristic data of the previous furnace is taken out to trace the trail of the setting value of the heating power and to directly control the heating power of the heater to realize the open-loop temperature control. The treatment method of temperature control thermocouple fault of the polysilicon ingot furnace is reliable and is easy to be realized, which can enhance the reliability of the equipment to the maximum limit and can satisfy the requirement of safety production of the polycrystalline silicon ingot furnace.

The invention discloses a device for determining the transmission power of an uplink frame sent from a user station to a base station and sending data in a mobile communication system. In the mobile communication system, the transmission power of an uplink frame sent from a base station to a user station is Downlink frames as well as the uplink frames are time division duplexed (TDD). The device includes: a received power measurement unit for measuring the received power of a signal received from a base station; a transmit power controller for measuring the received power measured by the received power measurement unit and the uplink signal received from the base station. information associated with the reception of the frame determines the transmit power of the uplink frame; and, a transmit radio frequency processor for performing radio processing to transmit the uplink according to the transmit power determined by the transmit power controller frame.

The embodiment of the invention discloses an uplink power control method which comprises: a network side redistributes code resources for a user device UE when the service type of the UE is changed. The method also comprises; when the uplink code resources before and after redistribution belong to the same carrier frequency and the same timeslot and when the UE before and after redistribution is arranged in the same area, the network side estimates the power excursion value caused by redistributing the uplink code resources and the changing of the service types and transmits the estimated power excursion value to the UE; the UE adds the power excursion value on the current emission power value and takes the obtained result as an initial power value for carrying out uplink closed loop power control. The method can be applied to leading the UE not to enter uplink open loop power control when the service changes, thereby improving the precision of the uplink power control.