Beam Management for Connected Mode Discontinuous Reception
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Solution Overview
Problem
In wireless communication systems, especially those operating at higher frequencies or using multiple beams, active beam pairs between user equipment (UE) and base stations can become misaligned during connected mode discontinuous reception (C-DRX) operations, leading to communication failures such as control channel decoding failures.
Innovation Solution
The system implements beam management procedures where a base station transmits a beam management parameter to a UE in a C-DRX OFF state, allowing the UE to monitor downlink reference signals and reconfigure the active beam pair before the next C-DRX ON duration, ensuring optimal beam alignment for improved control channel reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters C-DRX OFF state to conserve power, then power consumption is reduced, but beam alignment may deteriorate leading to communication failures
Solution Approach 1:
The base station transmits beam management parameters and reference signals to the UE before the C-DRX ON duration begins. This preliminary action ensures that beam alignment is established or refreshed in advance, so when the UE wakes up from C-DRX OFF state, the beam is already properly aligned and communication can proceed without failure.
Solution Approach 2:
The beam management procedure is segmented into distinct phases: transmission of beam management parameters, transmission of reference signals, and beam determination. This segmentation allows the system to perform beam management tasks efficiently during specific time windows without requiring continuous operation, thus supporting power-saving C-DRX operation while maintaining beam alignment.
2Reliability
If beam management procedures are performed continuously to maintain alignment, then beam alignment is improved, but power consumption and latency increase
Solution Approach 1:
Instead of continuous beam management, the system uses periodic action by transmitting beam management parameters and reference signals at specific intervals before C-DRX ON durations. This periodic approach maintains beam alignment reliability while avoiding the continuous power consumption and latency overhead of constant beam management operations.
3Reliability
If beam management parameters are transmitted before C-DRX ON duration, then control channel decoding reliability is improved, but transmission overhead increases
Solution Approach 1:
The beam management parameters are extracted and transmitted separately from the main data transmission. This allows the base station to provide necessary beam alignment information in advance without burdening the control channel with excessive overhead during active C-DRX ON durations, thus improving decoding reliability while managing overhead efficiently.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A base station may transmit a UE-specific beam management parameter to a user equipment (UE) in a connected mode discontinuous reception (C-DRX) OFF state. The UE-specific beam management parameter may indicate a time interval for reception of downlink reference signals (RSs) prior to the beginning of a next C-DRX ON state. The UE may monitor for downlink RSs, and transmit an uplink measurement report during the C-DRX OFF state, which may indicate a reconfigured active beam pair for use during the next C-DRX ON duration. In some cases, the UE may transmit uplink RSs to the base station, and the base station may reconfigure an active beam pair based on the uplink RSs. The UE may monitor for control information (e.g., in a physical downlink control channel (PDCCH)) during the next C-DRX ON duration, using the reconfigured active beam pair.