Systems and methods employ ultra-wide band (UWB) time of flight (ToF) distance measurements for locating a portable device relative to a target. Performance and reliability of UWB ToF distance measurements for locating the portable device is improved by adjusting a communication retry strategy based on signal quality calculations. The quality of an UWB signal received by each satellite of a base station is assessed based on factors like signal strength, noise level, and ratio of first path signal power to total signal power. This data is used to direct the retry strategy to the satellites receiving the best signal quality for these satellites to conduct ToF distance measurements with the portable device and/or to add correction factors to calculated ToF distance measurements.

Examples relate to access point signal estimation. In one example, a computing device may: receive a first pathloss value in a first frequency, the first pathloss value indicating a difference in transmit power of a particular access point and a received signal strength observed by a first access point; receive a second pathloss value in the first frequency, the second pathloss value indicating a difference in transmit power of the particular access point and a received signal strength observed by a second access point; receive a third pathloss value in a second frequency, the third pathloss value indicating a difference in transmit power of the particular access point and a received signal strength observed by the second access point in the second frequency; and generate, using the first, second, and third pathloss values, an estimated pathloss between the first access point and the particular access point in the second frequency.

Examples relate to access point signal estimation. In one example, a computing device may: receive a first pathloss value in a first frequency, the first pathloss value indicating a difference in transmit power of a particular access point and a received signal strength observed by a first access point; receive a second pathloss value in the first frequency, the second pathloss value indicating a difference in transmit power of the particular access point and a received signal strength observed by a second access point; receive a third pathloss value in a second frequency, the third pathloss value indicating a difference in transmit power of the particular access point and a received signal strength observed by the second access point in the second frequency; and generate, using the first, second, and third pathloss values, an estimated pathloss between the first access point and the particular access point in the second frequency.

A method and apparatus are disclosed for handling measurement in a wireless communication system. In one embodiment, the method includes the UE measuring a signal of a cell to derive information related to beamforming. The method further includes the UE providing the information to a network node, wherein the information comprises at least an average or a summation of measurement results for a number of qualified beams of the cell, and wherein the number of qualified beams to derive the average or the summation is limited by a first threshold.

A method and apparatus are disclosed for handling measurement in a wireless communication system. In one embodiment, the method includes the UE measuring a signal of a cell to derive information related to beamforming. The method further includes the UE providing the information to a network node, wherein the information comprises at least an average or a summation of measurement results for a number of qualified beams of the cell, and wherein the number of qualified beams to derive the average or the summation is limited by a first threshold.

In wireless communication networks using carrier aggregation including a secondary component carrier in unlicensed spectrum, a user equipment (UE) may monitor a downlink radio link quality of secondary cells for an event indicating failure of a communication link in the unlicensed spectrum with a secondary cell. The UE detects one or more failure events based on the downlink radio link quality. When a designated set of failure events is detected, the UE declares a failure state on the secondary cell. In response to the failure state, the UE may adjust operations related to the secondary component carrier in the unlicensed spectrum in order to save power and resources.

In wireless communication networks using carrier aggregation including a secondary component carrier in unlicensed spectrum, a user equipment (UE) may monitor a downlink radio link quality of secondary cells for an event indicating failure of a communication link in the unlicensed spectrum with a secondary cell. The UE detects one or more failure events based on the downlink radio link quality. When a designated set of failure events is detected, the UE declares a failure state on the secondary cell. In response to the failure state, the UE may adjust operations related to the secondary component carrier in the unlicensed spectrum in order to save power and resources.

Disclosed is a method for monitoring downlink control information in a communication system, including receiving information for an orthogonal frequency division multiplex (OFDM) symbol and information for frequency resources through higher layer signaling, and monitoring the downlink control information on a control region defined based on the information for the OFDM symbol and the information for the frequency resources, wherein the control region includes a user equipment (UE)-dedicated search space and a UE-common search space.

An apparatus is provided for measuring the performance of a mobile communication system. The apparatus includes two measurement mobile interfaces and a measurement probe. The probe is connected to the backhauling interface of a base station of the system. Then, one measurement mobile interface transmits packets to the other measurement mobile interface via the base station. These packets are received at the base station, forwarded to the packet gateway of the system, sent back to the same base station, and finally received at the destination measurement mobile interface. Since the measurement probe belongs to the same apparatus as the mobile interfaces, it may detect the packets as transmitted/received at the backhauling interface. The probe then generates performance parameters relating to the packets as transmitted/received by the mobile interfaces and/or as detected at the backhauling interface. The system performance is then measured based on such parameters.

An apparatus is provided for measuring the performance of a mobile communication system. The apparatus includes two measurement mobile interfaces and a measurement probe. The probe is connected to the backhauling interface of a base station of the system. Then, one measurement mobile interface transmits packets to the other measurement mobile interface via the base station. These packets are received at the base station, forwarded to the packet gateway of the system, sent back to the same base station, and finally received at the destination measurement mobile interface. Since the measurement probe belongs to the same apparatus as the mobile interfaces, it may detect the packets as transmitted/received at the backhauling interface. The probe then generates performance parameters relating to the packets as transmitted/received by the mobile interfaces and/or as detected at the backhauling interface. The system performance is then measured based on such parameters.