143 results about "Downlink power control" patented technology

Techniques to support independent power control of multiple channels in CDMA systems (e.g., a W-CDMA system) that define a single power control feedback stream on the uplink, which is to be used for downlink power control. In one aspect, the single feedback stream is "time shared" among multiple channels requiring individual power control. Various time-sharing schemes may be used to implement multiple (substantially parallel) feedback substreams based on the single feedback stream, and different combination of feedback rates may also be achieved for the substreams. Each feedback substream may be assigned to, and used for power control of, a respective channel. In another aspect, multiple feedback substreams are implemented based on multiple fields in newly defined slot formats.

Downlink power control commands are mapped to resources used for uplink communications within a wireless communication system. An eNode B receives communications from UEs and determines the resources used by the UEs for those transmissions on the uplink which are transmitted at non-optimum power levels. Power control messages are formulated wherein the location of the power control commands is mapped to particular resources used by the UEs for their uplink transmissions. This facilitates the eNode B to dynamically assign resources for the power control commands while permitting the UEs to decode the power control messages to adjust their power accordingly.

A mobile communication apparatus with multiple transmission and reception antennas and a mobile communication method therefor are provided. In the mobile communication apparatus including a base station and a mobile station, the base station with at least one transmission antenna restores long-term information, short-term information, a signal to interference and noise ratio (SINR) from a feedback signal received from the mobile station, spatially processes dedicated physical channel (DPCH) signals using basis information generated from the restored long-term information, short-term information, and SINR, and transmits the results of adding pilot channel (PICH) signals to the spatially processed results to the mobile station. The mobile station with at least one reception antenna determines a first characteristic corresponding to the channel downlink characteristic for each of the transmission and reception antennas, from the PICH signals transmitted from the base station, determines the long-term information, the short-term information, and downlink power control information including the SINR, which reflect the first characteristic, converts the determined long-term information, short-term information, and downlink power control information into the feedback signal, and transmits the feedback signal to the base station.

In a system having a base station transmitter for transmitting data blocks to one or more mobile stations over a radio link, a method for determining a transmit power level at which to transmit a current block. A quality measurement is received from a mobile station indicating an average radio link quality over a previous group of blocks, wherein not all of the blocks of the previous group of blocks were necessarily transmitted at the same transmit power level. A transmit power attenuation level is determined for the current block based on the quality measurement. The transmit power attenuation level is subtracted from the initial transmit power level to determine the transmit power level for the current block.

The invention discloses a method to perform downlink Power Control in packet switching cellular systems with dynamic allocation of the RF channel, such as GPRS/EGPRS. The performances concern a scenario in which a radio block transmitted from the Base Station (BTS) on a downlink channel has to be received from at least two MSs simultaneously, a first MS being the addressee of the data/control packet on the downlink TBF while the second MS being the addressee of the Uplink State Flag (USF) for scheduling transmission of the next data/control packet from an uplink TBF to an uplink shared channel. First MS transmits to the BTS a first measurement report including measures of BCCH level and interference level on all the timeslots, while the second MS transmits a NC report including measures of BCCH level only, that because detailed interference measure on the downlink channel are prevented due the absence of a concurrent downlink TBF. The measures are averaged in as many running average filters and the averages compared with target thresholds to find a first and a second power reduction intended for USF and packet transmission respectively. A final power reduction is selected from the two for the next PC execution step. Target threshold for the first MS's averaged measures is a C/I value which provides maximum achievable net throughput independently of Coding Scheme. Target threshold for the second MS depends on CS of the USF flag in a way that when the mean value of the level measures is equal to the threshold a fixed probability takes place that the USF flag is decoded with success. The network, in the capacity of the BSC and PCU, counts successfully and unsuccessfully blocks received uplink upon transmission of the scheduled USFs for that uplink TBF, being the lack of a scheduled block noticed by the network. If successfully counting reaches a fixed maximum counting before, then an increment of the first power reduction is decided, while in case the maximum unsuccessfully counting is reached before a decrement of the first power reduction is instead decided (FIG. 10).

The invention discloses a downlink power control method and a downlink power control device. The method comprises the following steps that: a base station side sends EPRE information which contains common pilot frequency, the cell dedicated parameter of ratio information of real EPRE of data in an OFDM signal which only contains the common pilot frequency to real EPRE of data in an OFDM signal which does not contain a reference signal, and user dedicated EPRE related information of initial EPRE of data in the OFDM signal which does not contain the reference signal; the base station side distributes each symbol power value on a resource block to be sent according to the cell dedicated parameter, the user dedicated EPRE related information and correction information of different user power and sends the resource block; and a terminal side receives a reference symbol, performs channel estimation, and detects and recovers the received reference symbol according to the ratio of data symbol EPRE and demodulated pilot frequency EPRE which are obtained by parametric computation. The method is favorable for improving the error code performance of a system so as to increase the information throughput of the user while realizing downlink power control.

A method in a wireless communications device, for example, 3GPP W-CDMA wireless mobile user equipment, including receiving a slot-structured signal having a dedicated control channel and a dedicated data channel, estimating a first SIR (410) on the dedicated control channel, estimating a second SIR (420) on the dedicated data channel if a symbol on the dedicated data channel contains data, weighting the first and second SIR estimates (430), and summing (440) the first SIR and the second SIR estimates after weighting.

The method comprises: considering the path losses and the time slot interference when calculating the downlink initial transmitted power in order to figure out the size of downlink initial transmitted power reasonably and to avoid the influence caused by oversized transmitted power or undersized transmitted power. During the process of just establishing the physical layer or re-allocating the channel or inter-cell switchover, even if there isn't the destination time slot interference measured value reported by UE, the invention can also figure out the downlink time slot interference, and use the downlink power control to calculate the downlink initial transmitted power so as either to ensure the success ratio of access and the Quos requirement or to avoid the heavy interference to other UEs.

A method for compensating for power variations in satellite communications includes measuring or estimating power variations for signals received at an earth-based terminal. The method also includes measuring or estimating changes in carrier-to-noise levels by a number of satellite terminals. The power variations may then be used to adjust the measured/estimated changes in carrier-to-noise (C/N) levels. The adjusted C/N levels may then be used to more accurately reflect actual network conditions and may be used in downlink power control related processing.

A downlink power control method and apparatus for improving downlink power efficiency gain in an Orthogonal Frequency Division Multiplexing (OFDM) system is provided. The downlink power control method includes transmitting a downlink data channel at a normal subframe according to first downlink power information for the normal subframe, and transmitting the downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for the ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. The downlink power control method and apparatus is capable of regulating inter-cell interference variation between contiguous symbols at a predetermined level in a subframe at a terminal of a neighbor cell and making it possible to schedule the UE receiving the low power data channel using the power ratio of the feedbacks from the UE.

A packet transmission method and apparatus for transmitting data packets via a telecommunication network are described, wherein the quality of a received data packet is judged and the data packet is tagged in response to the result of the quality judgment. The tagging is performed by adding a dropping information, wherein a tagged cell is dropped on the basis of the dropping information and a predetermined dropping condition such as a transmission congestion situation and/or an overuse of a contract of a particular connection. In the uplink direction, the quality judgment can be based on an error check or a comparison of a quality base likelihood parameter with a threshold value. In the downlink direction, the quality judgment can be performed on the basis of an uplink quality parameter and/or a downlink power control status. Accordingly, in case of a congestion and/or an overuse of a particular connection, low quality transmission packets are dropped first to thereby reduce traffic.

The application discloses an apparatus for controlling downlink power of the complex cell in the centralized base station system based on remote radio frequency units, said base station system having a plurality of radio frequency unit and a RAKE receiver connected to said plurality of radio frequency units, the apparatus comprising: signal quality measuring means connected to the RAKE receiver, for measuring signal quality of an uplink channel between each radio frequency unit and the same user equipment; average signal quality calculating means for calculating average signal quality of each uplink channel according to the measured signal quality; and power control means for adjusting transmission power of the downlink channel corresponding to the uplink channel according to said average signal quality, so that the transmission power of the downlink channel corresponding to the uplink channel with a lower average signal quality is relatively lower.

The embodiments of the invention provide a power control method. The method comprises: a base station emitting a reference signal through first emission power; and the first base station receiving power control performed on the first emission power of the first base station by a second base station, the first base station being disposed in the coverage scope of the second base station. The embodiments of the invention further provide a base station. Single emission power is employed for trying, and a macro base station, through determining the interference bought to surrounding cells by use of the tried emission power by a micro base station, decides whether to adjust the emission power of the micro base station of maintain current emission power, such that the downlink power control of the micro base station by the macro base station is realized.

This invention relates to a method for controlling down closed loop power in the TD-SCDMS system including: when a base station tests that the quality of the up link is at a worsen state, it turns itself to a down link resuming period to up-adjust the power control order with the resumed step length response power and down-adjust the power control order with conventional step length response power, in this way, the base station controls power of each down coding combined transmitting channel based on the down closed loop power control mode to strengthen the effect of down closed loop power control when quality of the up and down links drops at the same time.

The invention discloses a downlink power control method and a downlink power control device. The method comprises the following steps that: a base station side sends the cell dedicated parameter of EPRE information which at least contains common pilot frequency and user dedicated EPRE related information, and sends the correction information of different user power to a terminal side; the terminal side detects and recovers the received data from the base station side according to the cell dedicated parameter, the user dedicated EPRE related information and the correction information of different user power; and the base station side distributes each symbol power value on a resource block to be sent according to the cell dedicated parameter, the user dedicated EPRE related information and the correction information of different user power and sending the resource block. The method can well improve the error code performance and the capacity of a system.

A downlink power control method for base station, includes following steps: according to the received power control command, base station obtains the transmission power of each terminal occupying code channel; according to the transmission power of each terminal occupying code channel, determines the allowable minimum code channel power of each terminal; according to the determined minimum code channel power of each terminal, amends the transmission power of each terminal occupying code channel; according to the amended transmission power of each terminal occupying code channel, sends signals to the corresponding terminal respectively. Present invention could control the difference of signal power between different users, increase the stability of wireless link, and assure the quality of system communication.

The invention relates to a method for transmitting packet data in a radio system, the radio system comprising at least one base station and at least one subscriber terminal and a downlink power control arrangement, in which power control arrangement the quality of a signal transmitted by the base station is evaluated and, on the basis of this evaluation, power control commands are transmitted to the base station. The method comprises analysing (302) the power control commands received by the base station, searching (304) for one or more transmission moments, on the basis of the analysis, that satisfy the set conditions for packet-switched data transmission, and if at least one transmission moment is found that satisfies the set conditions, transmitting (306) packet data to at least one subscriber terminal at least at one transmission moment that satisfies the set conditions.

The invention discloses a controlling method and system of upward-downward power in the wireless communicating domain to reduce the indoor communication for outdoor interference, which comprises the following steps: calculating downward interference control threshold corresponding to calculating chamber according to the downward signal sampling data of adjacent areas; counting upward interference control threshold corresponding to calculating chamber according to the upward signal sampling data in the indoor area; judging the downward and/or downward launching power for the terminal for the terminal in the indoor area during power controlling stage; modulating the power not according to the judging result if the judging result affirms that the downward launching power of terminal at network side will be more than the downward interference control threshold; modulating the downward launching power of terminal to the downward interference control threshold; modulating the upward launching power of terminal to the upward interference control threshold if the judging result affirms that the upward launching power of terminal at network side will be more than the upward interference control threshold.

This invention discloses a down-power control method and a device used in switching, in which, the method includes the following steps: 1, when it's necessary for a UE to be switched to a target area from an original area, a radio network controller computes path loss between them, 2, the controller maps the loss onto a down-power control list to get corresponding initial emission power, 3, the controller emits a switch order containing the initial emission power information to the target area.

A method includes establishing a first radio link with a serving network entity and a second radio link with a target network entity, commencing a soft handover from the serving network entity to the target network entity, receiving a quality target from a network comprising the serving and target network entities, and applying the quality target only to the first radio link to generate a power control command.