LTE-Uplink Power Control for Adjacent Band Interference
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Solution Overview
Problem
In the LTE-Advanced mobile communication system, transmitting an uplink signal using multicarriers increases interference to adjacent frequency bands, regardless of using multiple or single transmission antennas or transmitters, posing a challenge in reducing this interference effectively.
Innovation Solution
The user equipment and base station device implement a communication control method where the uplink signal transmission power is set to be lower than the rated power, based on parameters such as the number of transmission antennas or transmitters, carriers, and modulation methods, to reduce interference. This is achieved through a control signal that instructs the reduction of maximum transmission power, specifically using the Additional Maximum Power Reduction (A-MPR) mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicarrier transmission is used for uplink signal, then transmission capacity and system throughput are improved, but interference to adjacent frequency bands increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power level based on the multicarrier transmission configuration. When multicarrier transmission is detected, the system applies an additional maximum power reduction (A-MPR) to lower the transmission power, thereby reducing interference to adjacent frequency bands while maintaining acceptable transmission capacity through the multicarrier approach
2Object-generated harmful factors
If maximum transmission power is reduced, then interference to adjacent systems is reduced, but transmission power available for communication decreases
Solution Approach 1:
The patent applies partial action by implementing selective power reduction rather than complete power limitation. The system applies additional maximum power reduction (A-MPR) specifically when multicarrier transmission is used, allowing full power for single-carrier transmission while partially reducing power for multicarrier transmission to control interference levels
Data Source
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AI summary
A radio base station according to the present invention comprising : a user equipment configured to execute radio communication with a base station device in a mobile communication system, the user equipment comprising, a control signal reception unit configured to receive a control signal providing instructions to transmit an uplink signal and an uplink signal transmission unit configured to transmit the uplink signal to the base station device on a basis of the control signal, the uplink signal transmission unit is configured to set a maximum value of transmission power of the uplink signal to be smaller than rated power defined by the mobile communication system on a basis of at least one of a parameter notified by the control signal and a number of transmission antennas or transmitters used for transmission of an uplink signal.