112 results about "Pilot power" patented technology

A method is provided for controlling pilot power in a communications system. The method comprises determining a load associated with a cell in the communications system, and setting pilot power at a level associated with the determined load. In one exemplary embodiment, pilot power is set at a first low level in response to the determined load being less than a preselected setpoint and at a second, higher level in response to the determined load being greater than the preselected setpoint.

Disclosed is an apparatus and a method for transceiving high speed packet data, in which the high speed packet data are scrambled by using a scrambling code at a transmitter and the high speed packet data are de-scrambled by using a scrambling code at a receiver. When estimating a ratio of pilot power to traffic power, a problem caused by an unevenness of the power ratio is prevented. In addition, data is prevented from being transferred to an upper layer even if an HS-PDSCH is demodulated without UE data due to a detection error in an HS-SCCH during transmission of the HS-PDSCH.

Systems and methods for performing a handoff of an access terminal from a macro node to a femto node are disclosed. In one embodiment, a femto convergence server may select a target femto node based on, at least in part, signal strengths of the reverse links between femto nodes with a specific identifier and an access terminal, and the transmit pilot powers of the femto nodes.

A satisfactory reception environment is secured efficiently regardless of a degree of the traffic intensity. A pilot power control unit is provided to a base station radio unit. The pilot power control unit controls a desired wave power-to-interference wave power ratio of a pilot signal to stay at a preset value. More specifically, upon receipt of a multiplex wave from a multiplexing unit, the pilot power control unit computes a desired wave power-to-interference wave power ratio of a pilot signal. Then, the pilot power control unit transmits a command signal to a coder to change a transmission power value of the pilot signal in an amount corresponding to a difference between the computed desired wave power-to-interference wave power ratio and a set desired wave power-to-interference wave power ratio.

An embodiment of the present invention provides a method for improving the capacity of a reverse link by realizing a scheme to effect sharp changes in pilot channel transmit power (PCTP) and data channel to pilot power ratio (DCPR), coordinated with the start of the data channel transmission. The change in pilot power and data channel to pilot power ratio is also applicable to mobiles that use multiple pilots and/or multiple antennas at the transmitter and/or receiver.

A camera-equipped mobile terminal and a method for automatically restricting the use of its picture-taking function are provided. The terminal detects a frequency signal of a wireless channel other than wireless channels used for communication, which has high Received Signal Strength Indication (RSSI) and low pilot power/total received power (Ec/Io). If the strength (i.e., RSSI value) of the detected frequency signal is greater than a predetermined threshold, the picture-taking function of the mobile terminal is deactivated.

A MIMO receiver, a MIMO reception method and a wireless communication system capable of accurate MMSE control even when each transmit antenna uses a different chip power ratio in MIMO filter reception. A correction coefficient calculator receives as input the chip power ratio of each transmit antenna, and estimates such pilot power that renders the chip power ratio of each transmit antenna equal to that of a reference transmit antenna. Thereby, the correction coefficient calculator calculates a correction coefficient β_m to correct the actual pilot power of each transmit antenna. A weight calculator receives as input transmission channel impulse responses transferred into frequency domain by FFT sections, chip noise power estimated by a chip noise estimation section, and the correction coefficient β_m obtained by the correction coefficient calculator. The weight calculator calculates filter weights according to the minimum mean square error (MMSE) criterion.

A closed loop power control based on receiving a continuous quality feedback is described. A main reverse link (RL) pilot is controlled by the quality feedback of a substantially continuous delay sensitive traffic stream, such as Voice-over-IP (VoIP), when such a stream is enabled. When such a stream is not enabled, the quality of a continuous RL overhead channel is used to control the pilot power. At the same time, the Traffic-to-Pilot Ratios (TPR) of contemporaneously transmitted delay sensitive data streams are independently adjusted based on a quality feedback associated with each such data stream.

A closed loop power control based on receiving a continuous quality feedback is described. A main reverse link (RL) pilot is controlled by the quality feedback of a substantially continuous delay-sensitive traffic stream, such as Voice-over-IP (VoIP), when such a stream is enabled. When such a stream is not enabled, the quality of a continuous RL overhead channel is used to control the pilot power. At the same time, the Traffic-to-Pilot Ratios (TPR) of contemporaneously transmitted delay-sensitive data streams are independently adjusted based on a quality feedback associated with each such data stream.

The invention proposes a method for controlling a network, comprising at least one cell served by a first type network device, wherein the first type network device is adapted to serve second type network devices, wherein the emission of the first type network device includes an individual pilot signal to the second type network devices, and the emission of the second type network devices includes measurement reports including information on the status and the situation of the respective device, the method comprising the steps of detecting information (S1) in the second type network devices, said information indicating the power level of the pilot signals received, collecting (S2) measurement reports (MR) from the second type network devices, said measurement reports (MR) including the pilot power information gained in the detecting step (S1), evaluating (S3) the pilot signal power coverage in that cell on the basis of a pre-given number of measurement reports (MR), automatically adjusting (S4) the pilot signal power coverage in that cell on the basis of the result of the evaluation step. The invention proposes also a device for controlling a network.

Method and system for the planning and/or evaluation of downlink coverage in a (CDMA) radio network. The service area of the radio network can be divided into pixels defined (a) by the grid (1), and cells (2) can be assigned (b) to the pixels. After assigning (c) the pilot power (3), the desired downlink transmission power (4) can be estimated (d) for the cell (2), which can be compared (e) to the maximum transmission power (5) of the base station. If needed changes in the radio network can be made and the planning and/or evaluation is restarted.

The method for supporting pilot boost to the uplink dedicated channels in the WCDMA system comprising steps of: transmitting E-TFCI to a Node B by a UE; adjusting an uplink pilot power boosting amplitude by the UE according to the E-TFCI; and performing a uplink inner loop power control by the Node B according to a measured SIR, a target preset by the inner loop power control and a pilot boost amplitude resulted from the E-TFCI. The object of supporting pilot boost is achieved by transmitting E-TFCI in advance by the UE, adjusting the power of pilot according to the E-TFCI properly, and considering the pilot power boosting amplitude when the Node B performs inner loop power control in the invention. Thus, the object of improving the capacity of the wireless communication system can be accomplished through supporting the pilot boost in the invention.

A joint dynamic pilot and data power allocation method for time division duplex large-scale MIMO systems belongs to the technical field of time division duplex large-scale MIMO, and is provided to adaptively reduce pilot pollution and balance mutual interference. Because the real-time channel state information before pilot is unknown, the Gauss-Markov process of a time-dependent channel is used, and a Kalman filter is used not only to filter pilot pollution, but also to provide a priori estimate. Then, the deterministic approximation of rate is derived as a function of prior channel estimationand prior estimation error, and rate maximization for maximum-minimization is formulated. In order to solve the optimization of pilot power and data power as well as the coupling between users, an iterative alternation rate optimization algorithm consisting of two sub-problems is presented, and successive convex approximation (SCA) and relaxation variables are introduced. The numerical results ofsimulation confirm the improvement rate provided by the scheme.

Frequency error estimation and frame synchronization are performed at a receiver in an OFDM system based on a metric that is indicative of detected pilot power. The metric may be defined based on cross-correlation between two received symbols obtained in two OFDM symbol periods. For frequency error estimation, a metric value is computed for each of multiple hypothesized frequency errors. The hypothesized frequency error for the metric value with the largest magnitude is provided as the estimated frequency error. For frame synchronization, a correlation value is obtained for each OFDM symbol period by correlating metric values obtained for NC (e.g., most recent) OFDM symbol periods with NC expected values. The expected values are computed in a manner consistent with the manner in which the metric values are computed. Peak detection is performed on the correlation values obtained for different OFDM symbol periods to determine frame synchronization.