151 results about "Open loop power control" patented technology

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.

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.

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 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.

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.

Disclosed is a base station apparatus for transmitting data in order to determine transmit power of an uplink in a mobile communication system, the base station apparatus comprising: an error detector for determining if an error has occurred in uplink frame received from a subscriber station; and an upper layer processor for receiving information related to whether or not the error has occurred in the uplink frame from the error detector and generating an ACK/NACK message of an upper layer according to the information for transmitting data in order to determine transmit power of an uplink frame transmitted from the subscriber station to the base station.

An end-to-end direct communication power control method for NB TDD CDMA mobile communication system comprising the steps of, the power control mode in the end-to-end direct communication being achieved by the two terminals of the direct communication, the uplink and downlink closed-loop proceeded in the normal communication terminal and network side controlling the parameters needed by the uplink open-loop power control, which exert influences on the channels between the two terminals. The invention reduces the disturbance for the residential area, improves the system capacity, and extends the time of usage for the terminal battery, the minimum influence to the system performance is also realized.