Beam Selection in Slot Aggregation Using TCI Offsets
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Solution Overview
Problem
In wireless communications, beam selection between user equipment (UE) and base stations during slot aggregation can lead to impaired decoding performance due to non-corresponding or inefficient beam choices, resulting in suboptimal signal-to-noise ratios (SNR) and increased beam switches.
Innovation Solution
The UE and base station implement rules for beam selection based on a threshold value for beam switching capability, using a transmit configuration indicator (TCI) and offset between scheduling and scheduled slots to choose beams that optimize SNR and reduce beam switches, ensuring better decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam switching capability is increased to support more flexible beam changes, then adaptability is improved, but beam switches increase leading to impaired decoding performance
Solution Approach 1:
The patent applies preliminary action by having the UE report its beam switching capability threshold to the base station in advance. The base station then uses this pre-reported information to determine appropriate beam selection and scheduling, avoiding last-minute beam changes that would impair decoding performance.
Solution Approach 2:
The patent implements feedback through the UE reporting its beam switching capability to the base station. This feedback loop allows the base station to adjust beam selection decisions based on actual UE capabilities, preventing beam switches that would degrade decoding performance while maintaining adaptability.
2Ease of operation
If beam selection rules are simplified to reduce complexity, then ease of operation is improved, but SNR optimization is compromised
Solution Approach 1:
The patent applies parameter changes by using the beam switching capability threshold as a key parameter to determine beam selection behavior. When the offset is greater than the threshold, the UE uses the TCI-indicated beam; when the offset is less than or equal to the threshold, the UE uses the initial beam. This parameter-based approach simplifies the selection logic while optimizing SNR.
3Reliability
If slot aggregation is extended to improve decoding performance, then reliability is improved, but the number of slots increases leading to more potential beam switches
Solution Approach 1:
The patent applies preliminary action by determining the beam selection strategy in advance based on the offset between scheduling and scheduled slots. This pre-determined approach allows the system to handle extended slot aggregations without introducing excessive beam switches, as the beam selection rules are established before the aggregation begins.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit to a base station an indication of a UE capability associated with a beam change at the UE. The UE may receive, from the base station during a scheduling slot, a control signal including a transmission configuration indicator (TCI) and a grant for a transport block over a first slot aggregation including a set of slots. In some cases, each slot of the first slot aggregation is offset from the scheduling slot according to a scheduling constraint based on the indicated UE capability. The UE may transmit or receive the transport block over the first slot aggregation using a UE beam based on the TCI.