TDD Radio Node UL-DL Configuration Adaptation
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Solution Overview
Problem
In TDD systems, UEs may not be capable of simultaneous transmission and reception on different cells due to differing UL-DL configurations, leading to degraded performance in measurements and operations such as mobility, positioning, and scheduling, especially in inter-band, inter-frequency, and intra-frequency scenarios.
Innovation Solution
The method involves determining differing UL-DL configurations in multiple cells and adapting measurement configurations and scheduling to avoid or reduce simultaneous transmission and reception by either not performing measurements during overlapping times, performing measurements in pre-defined resources, or delaying transmissions and receptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDD systems use different UL-DL configurations in multiple cells, then carrier aggregation and network flexibility are improved, but simultaneous transmission and reception cannot be performed leading to measurement degradation
Solution Approach 1:
The patent applies preliminary action by having the UE determine UL-DL configurations and identify overlapping time periods in advance. The UE proactively adapts measurement configurations before simultaneous transmission/reception issues occur, ensuring measurements are performed in appropriate time slots when interference is avoided.
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically adjust measurement timing based on the detected UL-DL configurations of serving and measured cells. The measurement timing is flexibly adapted to avoid simultaneous transmission/reception conflicts while maintaining measurement accuracy, allowing the system to respond to varying network configurations.
2Productivity
If measurements are performed during overlapping time periods with different UL-DL configurations, then measurement coverage is improved, but transmission interference occurs degrading measurement quality
Solution Approach 1:
The patent applies feedback by having the UE continuously monitor and determine the UL-DL configurations of both serving and measured cells. Based on this feedback information about the time period overlaps, the UE adapts its measurement configuration to select appropriate measurement timing, ensuring reliable measurements while maintaining comprehensive coverage.
3Measurement precision
If the UE adapts measurement configuration to avoid simultaneous transmission/reception, then measurement accuracy is improved, but measurement time is extended
Solution Approach 1:
The patent applies parameter changes by modifying the measurement timing parameters based on the detected UL-DL configurations. The UE changes measurement time slots to avoid simultaneous transmission/reception conflicts, selecting optimal measurement moments that ensure accuracy while minimizing time extension through intelligent parameter adjustment.
Data Source
AI summary
According to some embodiments, a method comprises determining a first uplink-downlink, UL-DL, configuration used in a first cell, determining a second uplink-downlink, UL-DL, configuration used in a second cell, and determining that the first UL-DL configuration and the second UL-DL configuration are different during an at least partly overlapping time period. The method comprises adapting at least one of a measurement configuration for performing a measurement in at least one of the first cell and the second cell, scheduling transmission of signals at the radio node in at least one of the first cell and the second cell, and scheduling reception of signals at the radio node in at least one of the first cell and the second cell.