A radio access network element, such as a remote radio head (RRH) comprises at least one processor and at least one memory. The at least one memory stores instructions that, when executed by the at least one processor, cause the radio access network element to: compute a communication delay between the radio access network element and a source of passive intermodulation, based on receiver group delay information for the radio access network element in the bandwidth of the passive intermodulation; and determine a distance between the source of passive intermodulation and the radio access network element based on the communication delay.

A sensing method includes: implementing, at a UE, a sensitivity time control profile to change a gain applied over time to a sensing signal received by the UE; and measuring the sensing signal to obtain a sensing signal measurement; wherein the method comprises at least one of: obtaining the sensitivity time control profile based on a sensitivity time control message received by the UE from a network entity; or transmitting a sensing report from the UE to the network entity, the sensing report indicating a measurement of the sensing signal and that sensitivity time control was implemented to obtain the sensing signal measurement.

Aspects of the subject disclosure may include, for example, obtaining data regarding interference detected in a received communication signal, and performing polarization adjusting by rotating one or more radiating elements of an antenna system such that an impact of the interference on the antenna system is minimized. Other embodiments are disclosed.

A method for controlling interference is performed by a terminal device, and includes: transmitting first indication information, wherein the first indication information indicates interference information of the terminal device.

Some embodiments of the invention provide a method for a PIM (passive intermodulation interference) detection RAN (radio access network) application deployed across one or more RICs (RAN intelligent controllers) for detecting PIM in a RAN including multiple RAN base stations for servicing multiple users located across multiple regions, each region including at least one RAN base station. The method is performed for a particular region serviced by a particular RAN base station. The method detects (1) high uplink noise for the particular region and (2) antenna imbalance for the particular region. Based on said detection, the method determines whether high KPI (key performance indicator) impact is detected for the particular region. When high KPI impact is detected for the particular region, the method generates a PIM alert to notify an operator of the particular RAN base station that services the particular region that PIM is detected for the particular region.

Methods and systems for identifying PIM sources for an antenna under test (AUT) are provided, where the AUT is installed in a desired operating environment. The system comprises: a PIM analyser, connected to the AUT for applying first and second RF stimulus signals to an input port of the AUT; and a portable RF emitter, configured to apply a third RF stimulus signal to suspected external PIM sources. The PIM analyser is configured to measuring one or more characteristics of PIM signals received by the AUT generated by the first, second and third RF stimulus signals.

A clock correction method suitable for a communication device comprising a clock correction circuit comprises: in response to the communication device being enabled and entering an active mode, calculating, by the clock correction circuit, a clock-period ratio between a slow clock and a fast clock; in response to the communication device operating in a power-saving mode for a power-saving period, counting at least one rising edge of the slow clock received by the clock correction circuit during the power-saving period, as a cumulative number; in response to the communication device switching to an active mode, calculating the difference between an internal time of the communication device and a reference time of another communication device as a time offset; and in the active mode, adjusting, by the clock correction circuit, the clock-period ratio by using a compensation value related to the clock-period ratio, the cumulative number and the time offset.

A receiver for a high-speed data communication interface includes a differential data signal input, a first termination resistor, a second termination resistor, and a noise measurement node. The differential data signal input includes a positive signal input and a negative signal input. The first termination resistor terminates the positive signal input to a reference voltage node. The second termination resistor terminates the negative signal input to the reference voltage node. The noise measurement node is coupled to detect common mode noise at the reference voltage node.

A radio access network element, such as a remote radio head (RRH) comprises at least one processor and at least one memory. The at least one memory stores instructions that, when executed by the at least one processor, cause the radio access network element to: compute a communication delay between the radio access network element and a source of passive intermodulation, based on receiver group delay information for the radio access network element in the bandwidth of the passive intermodulation; and determine a distance between the source of passive intermodulation and the radio access network element based on the communication delay.

A system for canceling signal source noise when measuring residual noise of a DUT includes a signal source for generating an RF signal having signal source noise; a signal splitter for dividing the RF signal into first and second RF signals in first and second paths, the first path including the DUT which outputs a DUT signal in response to the first RF signal; a first receiver for receiving the DUT and second RF signals, compensating for a delay difference and eliminating the signal source noise to output a delay compensated first signal without the signal source noise; a second receiver receiving the DUT and second RF signals, compensating for a delay difference and eliminating the signal source noise to output a delay compensated second signal without the signal source noise; and a processor for performing cross-correlation of the delay compensated first and second signals for measuring the residual noise.