UTO-UCI Skipping Indication for Accurate PHR in Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially in uplink carrier aggregation, the power headroom report (PHR) accuracy is compromised due to the assumption that skipped configured grant physical uplink shared channel (CG-PUSCH) occasions will be present, leading to inaccurate power headroom calculations.
Innovation Solution
A method where a user equipment (UE) transmits unused transmission occasion uplink control information (UTO-UCI) to indicate the skipping of CG-PUSCH occasions, allowing for a more accurate power headroom calculation by considering the impact of skipped CG-PUSCH occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE assumes all CG-PUSCH occasions will be present for PHR calculation, then the calculation process is simplified, but the PHR accuracy deteriorates
Solution Approach 1:
The UE transmits UTO-UCI in advance to notify the network node of skipped CG-PUSCH occasions before the PHR transmission. This preliminary notification allows the network node to adjust the PHR calculation by excluding the power consumption of skipped occasions, thereby resolving the accuracy issue without complicating the UE's calculation process
Solution Approach 2:
The UTO-UCI acts as an intermediary message between the UE and network node. It carries information about skipped CG-PUSCH occasions, enabling the network node to understand the actual transmission status and adjust the PHR interpretation accordingly, thus maintaining accurate power headroom assessment without requiring complex UE-side calculations
2Measurement precision
If the UE transmits UTO-UCI to indicate skipped CG-PUSCH occasions, then the PHR accuracy is improved, but the uplink control overhead increases
Solution Approach 1:
The UTO-UCI is merged with the existing PHR transmission by being included in the same uplink message (either PUCCH or PUSCH). This combining approach allows the network node to receive both the skip indication and the PHR in a single transmission, improving PHR accuracy while minimizing additional control overhead through resource efficiency
3Measurement precision
If the network node adjusts PHR calculation based on skipped CG-PUSCH occasions, then the power margin determination accuracy is improved, but the network side processing complexity increases
Solution Approach 1:
The network node uses the UTO-UCI feedback to adjust its interpretation of the PHR value. By receiving the skip indication and cross-referencing it with the PHR calculation parameters, the network node can accurately determine the power margin by excluding skipped occasion power consumption, achieving high accuracy through a straightforward feedback-based adjustment process
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, an uplink grant that schedules a dynamic grant physical uplink shared channel (DG-PUSCH) on a first component carrier. The UE may transmit, to the network node, unused transmission occasion uplink control information (UTO-UCI) indicating skipping of a configured grant physical uplink shared channel (CG-PUSCH) on a second component carrier in a future CG-PUSCH occasion that overlaps in time with the DG-PUSCH scheduled on the first component carrier. The UE may transmit, to the network node, the DG-PUSCH on the first component carrier, wherein the DG-PUSCH carries a power headroom report (PHR) associated with a power headroom calculation based on an impact of the UTO-UCI indicating skipping of the CG-PUSCH. Numerous other aspects are described.