Reference Subframe Power Headroom for Carrier Aggregation
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling high data traffic and spectrum demands, which affect network capacity and user experience.
Innovation Solution
The implementation of advanced OFDM technologies with dynamic modulation and coding schemes, carrier aggregation, and licensed assisted access (LAA) to optimize radio resource management and spectrum utilization, enabling efficient operation of multi-carrier communications and dual connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and dual connectivity are implemented to increase network capacity, then data traffic handling capability is improved, but system complexity increases
Solution Approach 1:
The patent segments the uplink transmission by introducing reference subframes and actual uplink subframes as distinct functional units. The reference subframe provides a baseline power headroom measurement, while actual uplink subframes use this reference to determine transmission parameters. This segmentation allows the system to handle carrier aggregation and dual connectivity by breaking down the complex multi-carrier transmission into manageable reference-based units, thereby increasing network capacity while controlling system complexity.
2Measurement precision
If power headroom reporting is performed for each uplink subframe, then uplink power management accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by determining power headroom information in advance during reference subframes. This pre-calculated power headroom is then reused for multiple subsequent actual uplink subframes. By performing the power measurement and reporting action beforehand, the system achieves accurate power management without generating excessive signaling overhead for each individual uplink subframe, thus resolving the contradiction between measurement precision and signaling efficiency.
3Loss of information
If reference subframe power headroom is reused for multiple uplink subframes, then signaling overhead is reduced, but power management accuracy may deteriorate
Solution Approach 1:
The patent introduces dynamics by allowing the system to adaptively select between using reference subframe power headroom and performing new measurements based on changing conditions. The reference power headroom is not rigidly applied to all subframes but is dynamically adjusted or refreshed when significant changes in transmission conditions occur. This dynamic approach maintains power management accuracy while still reducing signaling overhead compared to per-subframe reporting.
Data Source
AI summary
A base station transmits, during a first subframe, an uplink grant triggered in response to transmitting a trigger during a validation duration. The uplink grant indicates resource blocks. During the validation duration, the trigger indicating an uplink subframe for reception is transmitted via the resource blocks. A power headroom value determined for a reference subframe is received during the uplink subframe and via the resource blocks. The reference subframe: is after the first subframe; and is before the uplink subframe.