Adaptive Multi-Beam PDCCH Monitoring for CDRX Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in millimeter-wave (mmWave) systems, user equipment (UE) faces challenges in maintaining effective control channel monitoring during connected mode discontinuous reception (CDRX) operations due to potential movement or changes in orientation, which can render previously used receive beams ineffective, leading to uncertainty about which beams to monitor during subsequent ON periods.
Innovation Solution
The solution involves configuring the UE to associate specific beams with the DRX cycle periodicity, where different beams are used for short and long CDRX cycles based on the elapsed time since the last data transmission, allowing the UE to dynamically update its receive beams to maintain effective control channel monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses a single receive beam for control channel monitoring during CDRX operation, then the device complexity is reduced, but the reliability deteriorates due to potential movement or changes in orientation rendering the beam ineffective
Solution Approach 1:
The patent applies dynamics by making the beam configuration adaptive rather than static. The UE dynamically switches between single-beam and multi-beam monitoring configurations based on CDRX cycle length and timing conditions. For short CDRX cycles, a single beam is used to minimize complexity, while for long CDRX cycles, multiple beams are configured to maintain reliability against UE movement or orientation changes.
Solution Approach 2:
The patent changes the parameter of beam quantity from fixed to variable based on CDRX operation parameters. The network configures different numbers of receive beams according to the CDRX cycle length and timing, allowing the system to optimize between reliability and complexity by adjusting beam-related parameters dynamically.
2Reliability
If the UE monitors multiple beams during CDRX operation, then the reliability of control channel monitoring is improved, but the use of energy increases due to additional monitoring activities
Solution Approach 1:
The patent makes energy consumption dynamic by conditioning multi-beam monitoring on specific CDRX cycle lengths and timing conditions. The UE only activates multiple beam monitoring when necessary (for long CDRX cycles with sufficient time elapsed), avoiding unnecessary energy expenditure during short CDRX cycles where a single beam suffices.
Solution Approach 2:
The patent adjusts the parameter of active beam quantity based on CDRX operation parameters to optimize energy efficiency. By changing the number of monitored beams according to the CDRX cycle length and timing conditions, the system reduces energy consumption while maintaining adequate monitoring reliability.
3Reliability
If the UE frequently updates receive beams to adapt to movement, then the reliability of communication link is improved, but the loss of time increases due to beam switching and reconfiguration
Solution Approach 1:
The patent applies dynamics by making beam updates conditional rather than frequent. The system dynamically determines whether beam reconfiguration is needed based on CDRX cycle length and timing conditions, avoiding unnecessary beam switches that would cause time loss while maintaining reliability when actually needed.
Solution Approach 2:
The patent uses preliminary action by pre-configuring multiple receive beams in advance for long CDRX cycles. The network provides the UE with a set of candidate beams before the CDRX operation begins, so that when beam switching is needed, the UE can quickly activate a pre-configured beam without time-consuming reconfiguration.
4Ease of operation
If the UE uses a single beam for control channel monitoring, then the ease of operation is improved, but the adaptability deteriorates when UE movement or orientation changes occur
Solution Approach 1:
The patent makes the beam monitoring system dynamic and adaptive. The UE operates in a simplified single-beam mode during short CDRX cycles for ease of operation, but automatically transitions to multi-beam monitoring during long CDRX cycles to adapt to potential UE movement or orientation changes, balancing simplicity and adaptability.
Solution Approach 2:
The patent changes the operational parameter of beam quantity based on CDRX conditions. The system adjusts between single-beam and multi-beam configurations according to CDRX cycle length and timing, allowing the UE to maintain ease of operation when conditions permit while gaining adaptability when movement or orientation changes are likely.
Data Source
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AI summary
Aspects of the present disclosure relate to techniques for multibeam PDCCH monitoring during CDRX operations. A BS may determine a configuration of one or more beams for a UE to monitor for receiving a downlink control channel from the BS, wherein the configuration is based, at least in part, on a monitoring window since the subframe in which the downlink control channel (e.g., PDCCH), indicates an initial UL, DL, or SL use data transmission for the UE. The BS may transmit, to the UE, an indication of the configuration. A UE may perform corresponding operations and may monitor one or more beams based on the received configuration.