Power Headroom Reporting for Multi-TTI Wireless Systems
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Solution Overview
Problem
Wireless communication systems face challenges in effectively reporting power headroom for transmission time intervals (TTIs) of different durations, particularly in systems with multiple TTI durations, which affects resource allocation and low latency communications.
Innovation Solution
A method and apparatus for wireless communication that allows user equipment (UE) to identify and report power headroom for TTIs of different durations, either separately or combined, using physical uplink shared channels (PUSCH) or short PUSCH, enabling accurate power management across various TTI configurations, including those with carrier aggregation and dual connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate power headroom reports are transmitted for each TTI duration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments power headroom reporting by creating separate reporting mechanisms for different TTI durations. The UE maintains separate power headroom values for short TTIs and long TTIs, and transmits them in separate reports or separate fields within the same report, ensuring precise measurement for each TTI type without mixing them together.
Solution Approach 2:
The patent introduces a new dimension to power headroom reporting by adding a TTI duration indicator field that distinguishes between short TTI and long TTI power headroom values. This dimensional separation allows the system to handle multiple TTI durations within a unified reporting framework while maintaining measurement precision.
2Device complexity
If combined power headroom reports are transmitted for multiple TTI durations, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent adds a TTI duration indicator dimension to the combined report structure, allowing separate identification of power headroom values for different TTI durations within a single report. This enables unified transmission while maintaining the ability to distinguish and accurately represent power headroom for each TTI type.
3Adaptability or versatility
If power headroom reporting is implemented for multiple TTI durations, then adaptability is improved, but loss of information increases
Solution Approach 1:
The patent segments power headroom calculation and reporting by TTI duration, ensuring that power configuration information is preserved separately for short TTIs and long TTIs. This prevents information loss by maintaining distinct power headroom values rather than averaging or combining them, which would lose TTI-specific power configuration details.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. Separate or combined transmissions of power headroom reports for transmission time intervals (TTIs) having different durations may be transmitted. For example, a user equipment (UE) may be configured to communicate with TTIs of different durations. The UE may identify a transmission power for a first TTI having a first duration and calculate a power headroom based on a maximum transmission power of a serving cell and the transmission power for the first TTI. The UE may determine a power headroom for another TTI having a different duration (e.g., a duration longer than the first duration) and transmit separate power headroom reports for each TTI duration. Additionally or alternatively, the UE may calculate a power headroom associated with both TTI durations and transmit a joint power headroom report for both TTI durations.