A method is disclosed, performed in a radio network node, for handling interference caused by a plurality of wireless terminals served by the radio network node. The method comprises transmitting, to at least one wireless terminal of the plurality of wireless terminals served by the radio network node, a message indicative of a beam width restriction criterion to be applied to transmissions from the at least one wireless terminal.

A method is disclosed, performed in a radio network node, for handling interference caused by a plurality of wireless terminals served by the radio network node. The method comprises transmitting, to at least one wireless terminal of the plurality of wireless terminals served by the radio network node, a message indicative of a beam width restriction criterion to be applied to transmissions from the at least one wireless terminal.

An electronic device may include a harmonic rejection mixer with a delay line, mixer array, and load. The delay line may generate LO phases. Each mixer in the array may have a first input that receives an LO phase and a second input coupled to an input switch and the first input of the next mixer circuit through an inter-mixer switch. The load may include a set of switches. In a transmit mode, the input switches and set of switches may be closed while the inter-mixer switches are open. In a self-calibration mode, the input switches and set of switches may be open while the inter-mixer switches are closed. A controller may sweep through phase codes for the programmable delay line while storing a digital output from the load. The controller may calibrate the phase code based on the digital output.

An electronic device may include a harmonic rejection mixer with a delay line, mixer array, and load. The delay line may generate LO phases. Each mixer in the array may have a first input that receives an LO phase and a second input coupled to an input switch and the first input of the next mixer circuit through an inter-mixer switch. The load may include a set of switches. In a transmit mode, the input switches and set of switches may be closed while the inter-mixer switches are open. In a self-calibration mode, the input switches and set of switches may be open while the inter-mixer switches are closed. A controller may sweep through phase codes for the programmable delay line while storing a digital output from the load. The controller may calibrate the phase code based on the digital output.

Systems and methods for identifying Passive Intermodulation (PIM) products are disclosed. Some embodiments use RAN Performance Measurement (PM) counters, of actual DL Traffic Load to correlate with UL noise and interference counters. By using counters, the DL traffic is correlated to the increase in noise and interference in order to determine which DL carrier combinations are causing degradation to which UL carriers. In this way, aggressor-victim grouping can be identified through normal downlink traffic load with uplink interference to identify passive intermodulation products. This can be done for all aggressor-victim groups within a radio base station site or cluster of sites. Also, some embodiments enable estimating the maximum PIM interference created by the aggressor carriers. This helps operators to quantify the impact of PIM and can enable them to take counter measures. These embodiments are Radio Access Technology (RAT) agnostic and operator agnostic for the aggressors within a site.

A terminal includes a control unit that determines a resource to be used for measurement, based on a condition, among a plurality of resources for estimating interference, and a measuring unit that measures L1-SINR (Layer1 Signal to interference plus noise power ratio) using the determined resource.

A method comprises: at a management entity configured to monitor a transceiver system having a transceiver to receive a signal that conveys data frames transmitted by a peer transceiver over a connection: collecting time series values for operating parameters of the transceiver associated with received data frames, including (i) a receive power, and (ii) counts of different media access control (MAC) layer frame errors that respectively indicate degradation levels for system performance ranked from highest to lowest; using the time series values, performing correlations of the receive power against the counts of the different MAC layer frame errors according to a correlation hierarchy that indicates which of the correlations correspond to which of the degradation levels, to produce correlation results; and responsive to the correlation results, determining a degraded component of the transceiver system.

A method comprises: at a management entity configured to monitor a transceiver system having a transceiver to receive a signal that conveys data frames transmitted by a peer transceiver over a connection: collecting time series values for operating parameters of the transceiver associated with received data frames, including (i) a receive power, and (ii) counts of different media access control (MAC) layer frame errors that respectively indicate degradation levels for system performance ranked from highest to lowest; using the time series values, performing correlations of the receive power against the counts of the different MAC layer frame errors according to a correlation hierarchy that indicates which of the correlations correspond to which of the degradation levels, to produce correlation results; and responsive to the correlation results, determining a degraded component of the transceiver system.

A communication device according to one aspect of the present disclosure includes an acquisition unit, a calculation unit, and a radio wave communication unit. The acquisition unit acquires a position of a reference point provided in a region related to a first wireless system and a limit value of an interference quantity at the reference point. The calculation unit calculates, on the basis of at least the position and the limit value, allowable power by which an interference quantity of a radio wave transmitted by beamforming at the reference point is equal to or less than the limit value. The radio wave communication unit that transmits a radio wave having a frequency within a second frequency band partially or entirely overlapping with a first frequency band allocated to the first wireless system by beamforming with power equal to or less than the allowable power.

The method of the invention is related to utilizing the convergence patterns of sparse coding for detecting a primary user emulation/signal jamming attack in a cognitive radio setting. The method basically comprises a training stage and a testing stage. Through the method, the hypothesis which shows that there is no primary user but only noise (H.sub.0), the hypothesis which shows that there is a legitimate primary user present with a right to use the spectrum and the secondary user should not use the spectrum (H.sub.1), and the hypothesis which shows that there is a primary user emulator/signal jammer in the environment (H.sub.2) can be distinguished.