Power Headroom Report Handling for Multiple TTI Lengths
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Solution Overview
Problem
The existing LTE communication systems are unable to handle power headroom reports for multiple transmission time intervals, as the reports are currently only developed for legacy time intervals and not applicable to time intervals of varying lengths.
Innovation Solution
A communication device and method that determine and transmit power headroom reports for multiple transmission time intervals, allowing for different lengths of time intervals, enabling proper network scheduling based on power headroom levels across various serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power headroom report transmission is designed only for legacy TTI, then the system maintains simplicity and compatibility with existing LTE standards, but it cannot support multiple TTI types (shortened and legacy TTIs) simultaneously
Solution Approach 1:
The patent segments the PHR handling mechanism by introducing separate PHR fields for different TTI types. Specifically, it divides the PHR structure into legacy PHR fields for normal TTIs and shortened PHR fields for shortened TTIs, allowing independent processing and reporting for each TTI type without interfering with the other.
Solution Approach 2:
The patent creates a universal PHR framework that can handle both legacy and shortened TTIs through a single uplink transmission mechanism. The base station receives and processes both types of PHR reports through the same physical uplink channel, making the system multi-functional while maintaining structural unity.
2Measurement precision
If separate PHR fields are introduced for different TTI types, then the system can accurately report power headroom for each TTI type, but the PHR message structure becomes more complex
Solution Approach 1:
The patent segments the PHR message into distinct fields: legacy PHR fields containing power headroom information for normal TTIs, and shortened PHR fields containing power headroom information for shortened TTIs. This segmentation allows precise measurement and reporting for each TTI type while organizing the complex information into manageable, structured components.
Solution Approach 2:
The patent applies local quality by assigning different PHR field structures to different TTI types based on their specific requirements. Each TTI type has its dedicated PHR fields with appropriate formatting and parameters, allowing optimized power headroom reporting for each type while maintaining overall system consistency.
3Productivity
If the system supports both shortened and legacy TTIs with different lengths, then transmission efficiency is improved, but the network scheduling complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station receives separate PHR reports for different TTI types and uses this information to make informed scheduling decisions. The feedback loop allows the network to adjust resource allocation, modulation and coding schemes, and power settings based on the specific power headroom conditions of each TTI type, thereby managing scheduling complexity through data-driven decisions.
Solution Approach 2:
The patent enables dynamic scheduling where the base station can flexibly allocate resources for different TTI types based on real-time power headroom conditions. The system can dynamically switch between shortened and legacy TTIs, adjust transmission parameters, and optimize resource allocation according to the specific requirements and channel conditions of each TTI type.
Data Source
AI summary
A communication device for handling a power headroom report (PHR) for multiple transmission time intervals (TTIs) comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise determining a single PHR for a first TTI of at least one first serving cell according to at least one PH level of the at least one serving cell, wherein the communication device is configured with at least one second serving cell of at least one second TTI; and transmitting the PHR to a network via one of the at least one serving cell; wherein a length of the first TTI is different from each length of the at least one second TTI.