Multicast Wakeup Signal Beam Selection via UE Preference
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing multicast wakeup signals for user equipment with reduced capabilities, such as RedCap UEs, leading to increased radio resource consumption and power consumption due to beam sweeping for multicast wakeup signals.
Innovation Solution
A method where user equipment reports a preferred beam and multicast session to the base station, which then associates a multicast wakeup signal (WUS) with a set of beams including the preferred beam, allowing the base station to transmit the WUS efficiently using this beam list, reducing unnecessary beam sweeping and conserving radio resources and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweeping is used for multicast wakeup signals, then coverage is improved, but radio resource consumption increases
Solution Approach 1:
The UE performs beam measurement and reports preferred beam information to the base station in advance before the multicast wakeup signal transmission. This preliminary action allows the base station to pre-determine the appropriate beam for multicast WUS transmission, avoiding the need for exhaustive beam sweeping at the time of actual signal transmission, thus reducing radio resource consumption while ensuring coverage.
Solution Approach 2:
The UE actively participates in the beam selection process by measuring reference signals, determining preferred beams, and reporting this information back to the base station. This self-service approach enables the system to optimize beam selection based on actual UE conditions without requiring the base station to perform resource-intensive beam sweeping for each UE.
2Reliability
If beam sweeping is used for multicast wakeup signals, then coverage is improved, but power consumption increases
Solution Approach 1:
The base station determines the beam for multicast wakeup signal transmission in advance based on preferred beam information reported by the UE. This preliminary determination eliminates the need for power-consuming beam sweeping operations at the time of WUS transmission, significantly reducing the power consumption of the UE while maintaining reliable coverage through appropriate beam selection.
3Measurement precision
If PDCCH monitoring is increased for multicast WUS, then detection accuracy is improved, but power savings are reduced
Solution Approach 1:
The system applies different monitoring strategies to different UEs based on their reported capabilities and conditions. UEs that report preferred beam information and support the optimized approach can operate with reduced PDCCH monitoring, achieving power savings. The base station configures appropriate monitoring parameters for each UE, allowing detection accuracy to be maintained for UEs that require it while enabling power savings for UEs that can use the streamlined approach.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a base station, a first message that indicates a preferred beam and a multicast session. The UE may receive, from the base station, a second message that indicates an association between a wakeup signal (WUS) and the multicast session, and a set of beams for receiving the WUS, the set of beams including the preferred beam. The UE may receive, from the base station and based at least in part on the second message, the WUS for the multicast session using a beam from the set of beams. Numerous other aspects are provided.