Unified TCI Default Beam Selection Under Short Scheduling Offsets
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Solution Overview
Problem
In wireless communication systems, the use of default beams for cross-carrier scheduling with unified transmission configuration indicators (TCI) can lead to increased power consumption and reduced reliability due to unnecessary beam switching and suboptimal beam selection when scheduling offsets are short or TCI fields are absent in DCI.
Innovation Solution
A method where a user equipment (UE) or network node uses a default beam associated with a TCI state indicated by initial DCI for receiving downlink communications in a second component carrier, even when the indicated TCI state is not the one with the lowest ID, under certain conditions such as scheduling offsets being less than a time duration threshold or absence of TCI fields in subsequent DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam switching is performed based on TCI state indications in DCI, then communication adaptability is improved, but power consumption increases and reliability decreases when scheduling offsets are short
Solution Approach 1:
The patent changes the parameter selection criteria based on the scheduling offset value. When the scheduling offset is below a threshold, the system uses a default TCI state instead of the indicated TCI state. This parameter-based conditional logic resolves the contradiction by adapting the beam selection strategy to the available time resources, ensuring reliable communication when switching time is insufficient while maintaining adaptability when adequate time is available.
2Use of energy by moving object
If default beam is used for cross-carrier scheduling, then power consumption is reduced, but communication reliability decreases due to suboptimal beam selection
Solution Approach 1:
The patent dynamically changes the beam selection parameter based on the scheduling offset condition. Instead of always using the default beam or always switching to the indicated TCI state, the system selects the appropriate TCI state based on whether the scheduling offset meets the threshold requirement. This resolves the contradiction by ensuring optimal beam selection (using indicated TCI state) when time permits, while using default beam (lowest overhead) when time is constrained, thus balancing reliability and power consumption.
3Adaptability or versatility
If TCI state switching is performed, then communication adaptability is improved, but power consumption increases due to frequent beam switching operations
Solution Approach 1:
The patent introduces a threshold parameter for the scheduling offset that determines whether TCI state switching should occur. When the scheduling offset is below the threshold, the system maintains the default TCI state to avoid power-consuming beam switching operations. When the offset exceeds the threshold, the system performs TCI state switching to improve communication adaptability. This parameter-based decision mechanism resolves the contradiction by optimizing the trade-off between adaptability and power consumption based on available time resources.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive first downlink control information (DCI) that indicates a transmission configuration indicator (TCI) state to be applied starting from a starting time associated with the first DCI. The UE may receive, in a first component carrier, second DCI that schedules a downlink communication in a second component carrier. The UE may receive the downlink communication in the second component carrier using a default beam associated with the TCI state indicated by the first DCI in connection with a default beam condition associated with the second DCI. Numerous other aspects are described.