RRM Measurement Reporting for Shared-Spectrum Carrier Variability
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Solution Overview
Problem
In wireless communication systems, performing RRM measurements in a shared radio frequency spectrum band is challenging due to irregular intervals and varying transmit powers resulting from contention for access, leading to unreliable measurement results.
Innovation Solution
Associating RRM measurements with measurement time indications and carrier indications, and transmitting these to the base station, allowing for unfiltered and non-averaged values to be reported, thereby mitigating the effects of irregular intervals and varying transmit powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRM measurements are performed in a shared radio frequency spectrum band, then the system can utilize additional spectrum resources, but the measurement reliability deteriorates due to irregular intervals and varying transmit powers
Solution Approach 1:
The patent implements feedback mechanisms where measurement time indications are transmitted from the UE to the base station, enabling the base station to adjust its transmit power and measurement scheduling based on received measurement data and channel conditions, thereby improving measurement reliability in shared spectrum bands
Solution Approach 2:
The patent changes the parameter of transmit power from fixed to variable based on contention outcomes, and introduces measurement time indications to track when measurements are performed. This allows the system to adapt measurements to the actual transmission conditions in shared spectrum, resolving the reliability issue while maintaining spectrum flexibility
2Adaptability or versatility
If the base station divides fixed total transmit power among multiple downlink carriers, then the power distribution becomes more flexible, but the measurement consistency deteriorates due to varying transmit powers across carriers
Solution Approach 1:
The patent adds a time dimension to measurements by introducing measurement time indications that specify when each measurement is performed. This allows the base station to correlate measurements with specific transmit power configurations, enabling consistent interpretation of measurements even when power varies across carriers and time
3Adaptability or versatility
If RRM measurements are performed at irregular intervals due to contention outcomes, then the system can adapt to shared spectrum availability, but the measurement regularity deteriorates leading to unreliable results
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure measurement parameters and transmit power settings before measurements are performed. The measurement time indications are predetermined and communicated to the UE, allowing the UE to perform measurements at appropriate times while the base station prepares the corresponding transmit configurations in advance
Solution Approach 2:
The feedback mechanism transmits measurement time indications from UE to base station, creating a closed-loop system where the base station can adjust future measurement scheduling and transmit power based on past measurement outcomes, thereby stabilizing the measurement process despite irregular spectrum availability
Data Source
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AI summary
Techniques are described for wireless communication. One method includes performing a plurality of radio resource management (RRM) measurements for a number of active downlink carriers in a shared radio frequency spectrum band; associating each of the RRM measurements with a measurement time indication; and transmitting data corresponding to the RRM measurements and the measurement time indications to a base station. Another method includes receiving an indication of co-located downlink carriers in a shared radio frequency spectrum band; performing a plurality of RRM measurements for the downlink carriers; combining the RRM measurements over a time interval in the shared radio frequency spectrum band based at least in part on the received indication; and transmitting a report based at least in part on the combined RRM measurements to a base station.