Uplink Power Reporting in Dual Connectivity Carrier Aggregation
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Solution Overview
Problem
In mobile communication systems with inter-base station carrier aggregation, base stations struggle to obtain sufficient uplink transmission power information, leading to potential insufficient throughput due to inadequate power allocation and scheduling.
Innovation Solution
A user apparatus equipped with a transmission trigger detection unit and an uplink transmission power information transmission unit to detect and transmit power headroom reports (PHR) to either the first or second base station based on specific triggers, ensuring proper power control and scheduling across both stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user apparatus transmits PHR to both base stations in dual connectivity, then the base stations can perform accurate power control and scheduling, but the transmission trigger detection and power information transmission become more complex
Solution Approach 1:
The patent segments the power headroom reporting by dividing component carriers into MCG (Master Cell Group) and SCG (Secondary Cell Group). The PHR is separately reported for each group, allowing base stations to obtain accurate power information for their respective managed carriers without requiring the UE to transmit to both base stations simultaneously, thus reducing transmission complexity while maintaining power control accuracy.
2Productivity
If the user apparatus transmits uplink data to both base stations simultaneously, then the throughput is enhanced, but the uplink transmission power may become insufficient
Solution Approach 1:
The patent implements feedback mechanisms where the UE transmits PHR to base stations based on specific triggers (pathloss changes, buffer status changes, etc.). This feedback enables base stations to dynamically adjust uplink grants and power allocation, ensuring that the total uplink power across MCG and SCG remains within the UE's maximum power budget while maximizing throughput through efficient resource utilization.
3Adaptability or versatility
If the base station performs scheduling without accurate power information, then the scheduling flexibility is improved, but the throughput becomes insufficient due to inadequate power allocation
Solution Approach 1:
The patent employs preliminary action by having the UE proactively transmit PHR to base stations before scheduling decisions are made, based on predetermined triggers such as pathloss threshold changes, buffer status changes, or periodic intervals. This advance power information enables base stations to perform optimized scheduling with full knowledge of available power resources, achieving both scheduling flexibility and maximum throughput.
Data Source
AI summary
A user apparatus in a mobile communication system including a first base station and a second base station that perform communication with the user apparatus by inter-base station carrier aggregation, including: a transmission trigger detection unit configured to detect a transmission trigger for transmitting uplink transmission power information in the user apparatus to the first base station or to the second base station; and an uplink transmission power information transmission unit configured to transmit the uplink transmission power information to the first base station or to the second base station based on a transmission trigger detected by the transmission trigger detection unit.