Power Headroom Reporting for Overlapping Multi-Cell Uplink Grants
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power headroom reporting in multi-cell environments, particularly in scenarios involving concurrent uplink transmissions, which can lead to inefficiencies and interference.
Innovation Solution
The implementation of enhanced Power Headroom Reporting (PHR) mechanisms, including multiple entry PHR MAC CEs and unified TCI state activation/deactivation, allows for concurrent UL transmission configurations and improved power management across multiple serving cells, enabling more accurate and efficient power headroom reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports multiple PHRs for one serving cell in concurrent uplink transmission scenarios, then the power headroom reporting accuracy is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
The patent divides the power headroom reporting into multiple separate PHR reports, each corresponding to a specific PUSCH transmission. Instead of reporting a single aggregated PHR, the UE generates individual PHR values for each overlapping PUSCH on different serving cells, allowing the network to evaluate power headroom for each transmission separately. This segmentation enables precise power management for concurrent uplink transmissions while maintaining clear reporting structure.
Solution Approach 2:
The patent introduces a new dimension to PHR by adding serving cell identification and PUSCH transmission instance identification to the traditional single PHR value. Each PHR report now includes dimensions for distinguishing which serving cell and which PUSCH transmission the power headroom measurement corresponds to, enabling multi-dimensional power headroom analysis without overwhelming complexity.
2Productivity
If the UE selectively selects PUSCH based on characteristics of overlapping transmissions, then the resource allocation efficiency is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies local quality by evaluating different characteristics (such as power headroom, channel conditions, QoS requirements) for each specific PUSCH transmission instance rather than using a uniform selection criterion. The UE selectively chooses which PUSCH to prioritize based on local conditions of each transmission, such as the power headroom available for that specific serving cell and the urgency of the data transmission.
Solution Approach 2:
The patent changes the selection parameters from simple rules-based approaches to multi-parameter evaluation including power headroom margins, path loss conditions, QoS priority levels, and buffer status. By dynamically adjusting which parameters are most important for selection based on current network conditions, the UE can efficiently resolve overlapping PUSCH transmissions without complex algorithms.
3Productivity
If the network configures concurrent uplink transmissions across multiple serving cells, then the data throughput is improved, but the interference and power management challenges increase
Solution Approach 1:
The patent implements feedback mechanisms where the UE continuously reports power headroom information for each serving cell and PUSCH transmission to the network. Based on these feedback reports, the network can dynamically adjust uplink power allocation, modify transmission configurations, or reallocate resources to mitigate interference between concurrent transmissions. The feedback loop enables real-time optimization of concurrent uplink transmissions.
Solution Approach 2:
The patent makes the uplink transmission configuration dynamic by allowing the network to adjust power allocation, resource blocks, and transmission parameters for each serving cell based on current channel conditions and interference levels. Instead of static concurrent transmission configurations, the system continuously adapts parameters to optimize throughput while managing interference between simultaneous PUSCH transmissions on different serving cells.
Data Source
AI summary
A method and apparatus are disclosed. In an example, a User Equipment (UE) triggers a first Power Headroom Report (PHR). The UE receives one or more uplink grants indicative of a first Physical Uplink Shared Channel (PUSCH) and a second PUSCH on a second serving cell, wherein the first PUSCH at least partially overlaps with the second PUSCH in time domain. The UE selects the first PUSCH, from among the first PUSCH and the second PUSCH, based on one or more first characteristics of the first PUSCH and/or one or more second characteristics of the second PUSCH. The UE determines the first PHR for the second serving cell based on the first PUSCH. The UE transmits a PHR Medium Access Control (MAC) Control Element (CE), include the first PHR, to a network node that configured the UE to report one PHR for one serving cell.