Uplink Beam Management via Default Beam Selection
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Solution Overview
Problem
Current wireless communication devices face challenges in efficiently managing uplink beams due to Maximum Power Reduction (MPE) limitations, which can lead to UL coverage loss and require frequent beam changes, especially in high-frequency bands.
Innovation Solution
The proposed solution involves determining a set of default uplink beams for PUSCH/PUCCH repetitions based on multiple downlink beams used for receptions, allowing for efficient UL beam management with reduced latency and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If narrow beams of high beamforming gains are used for UL transmission, then beamforming gain is improved, but MPE limitation causes UL coverage loss and requires frequent beam changes
Solution Approach 1:
The patent segments the UL beam management process by determining a set of default UL beams based on multiple DL beams before transmission. This segmentation allows the system to divide the beam selection into pre-determined defaults and dynamic adjustments, reducing the need for frequent beam changes during transmission while maintaining coverage reliability.
Solution Approach 2:
The patent applies preliminary action by determining default UL beams in advance based on multiple DL beams before actual UL transmission occurs. This pre-determination of default beams reduces latency and signaling overhead during actual transmission, as the beams are already selected and ready for use without requiring real-time beam management decisions.
2Reliability
If frequent beam changes are made to overcome MPE limitation, then UL coverage is maintained, but latency and signaling overhead increase
Solution Approach 1:
The patent determines a set of default UL beams in advance based on multiple DL beams before transmission. This preliminary determination eliminates the need for frequent real-time beam management signaling during transmission, reducing latency and signaling overhead while maintaining UL coverage through the pre-selected default beams.
Solution Approach 2:
The system enables self-service by allowing the UE to autonomously determine and use default UL beams based on DL beam measurements without requiring continuous network control signaling. This self-determined beam selection reduces signaling overhead and latency, as the UE independently manages its beam selection based on pre-configured rules and measurements.
3Speed
If default UL beams are determined based on multiple DL beams, then beam adaptation speed is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using the same set of DL beams for both DL reception and as the basis for determining UL transmission beams. This multi-functional use of DL beam information simplifies the overall beam management process, as the same measurements and configurations serve dual purposes, reducing device complexity while enabling fast beam adaptation.
Solution Approach 2:
The UE autonomously determines default UL beams based on its own DL beam measurements and configurations without requiring additional network control signaling. This self-service approach simplifies the system architecture by eliminating complex network-side beam management procedures, reducing device complexity while maintaining fast beam adaptation capability.
Data Source
AI summary
A number of repetitions equal to a first number and a number of spatial relations equal to a second number can be determined (210) to transmit an uplink channel with a plurality of uplink channel repetitions and with a plurality of spatial relations. A total number of the plurality of uplink channel repetitions can be the first number of repetitions and a total number of the plurality of spatial relations can be the second number of spatial relations. The plurality of spatial relations for transmission of the plurality of uplink channel repetitions can be determined (220) based on a plurality of quasi-co-location assumptions associated with downlink reception. The plurality of uplink channel repetitions can be transmitted (230) based on the determined plurality of spatial relations.