Uplink Power Control in Multi-Carrier LTE-A Systems
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Solution Overview
Problem
Conventional technologies cannot support effective uplink power control operations in mobile communication systems that utilize multiple carriers, specifically in LTE-A systems employing carrier aggregation technology.
Innovation Solution
A method and apparatus for a user equipment (UE) and eNodeB to receive and transmit uplink transmission power information across multiple carriers, where the UE determines transmission power based on received power control commands from multiple downlink carriers, and the eNodeB configures and transmits these commands to ensure efficient uplink power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation technology is used to support multiple carriers in LTE-A systems, then system bandwidth and service capacity are improved, but uplink power control operation capability deteriorates because conventional technologies cannot support it
Solution Approach 1:
The patent segments the uplink power control mechanism by introducing separate TPC commands for each uplink carrier. Each TPC command is independently transmitted through corresponding downlink carriers, allowing individual power control adjustment for each carrier rather than treating all carriers as a single unit. This segmentation enables precise power control in multi-carrier systems.
Solution Approach 2:
The patent implements feedback mechanisms where the eNodeB transmits TPC commands to the UE based on received uplink signals, and the UE adjusts its transmission power accordingly. This closed-loop feedback system allows dynamic power adjustment for each carrier, ensuring reliable uplink power control operation while supporting carrier aggregation.
2Productivity
If multiple downlink carriers are used to transmit TPC commands, then power control information delivery is improved, but device complexity increases due to multiple carriers and commands
Solution Approach 1:
The patent makes each downlink carrier multi-functional by enabling it to carry both data transmissions and TPC commands for corresponding uplink carriers. This universal approach allows the same downlink resources to serve multiple purposes, improving power control information delivery without proportionally increasing overall system complexity.
Solution Approach 2:
The patent establishes predetermined associations between downlink carriers and uplink carriers before transmission begins. This preliminary configuration allows the UE to know in advance which TPC commands to expect on which carriers, reducing processing complexity and enabling efficient power control information delivery without requiring complex real-time decision-making.
Data Source
AI summary
The present invention provides user equipment that transmits an uplink signal in a multi-carrier supporting mobile communication system and a method therefor, and a base station device that transmits uplink transmission power information and a method therefor. In the user equipment according to the present invention, a receiving antenna receives uplink transmission power information on a particular uplink carrier from the base station via a plurality of downlink carriers. A processor determines the transmission power of a signal to be transmitted via the particular uplink carrier, based on the uplink transmission power information that has been received. A receiving antenna then transmits the signal via an uplink carrier at the transmission power determined by the processor.