Uplink Power Control in 5G Terminals with Beam Switching
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Solution Overview
Problem
In mobile communication systems, particularly in 5G networks, there is a challenge in efficiently setting the uplink transmission power of terminals to minimize interference and reduce unnecessary power consumption, especially in super-high-frequency bands where pathloss increases and beamforming techniques are employed.
Innovation Solution
A method is disclosed for determining the uplink transmission power of a terminal, involving power ramping mechanisms and beam switching considerations, where the terminal adjusts its transmission power based on pathloss and feedback from the base station, using equations to calculate optimal power levels for random access preambles and data channels, ensuring efficient power allocation and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmission power is increased to overcome pathloss in super-high-frequency bands, then transmission distance and signal reliability are improved, but uplink interference increases and power consumption rises
Solution Approach 1:
The patent implements dynamic power adjustment by introducing a power ramping mechanism that adapts transmission power based on random access preamble transmission attempts and beam switching events. The terminal dynamically adjusts power levels using equations that consider pathloss, target received power, and power ramping steps, rather than using fixed high power levels. This dynamic approach maintains signal reliability while minimizing unnecessary interference.
Solution Approach 2:
The patent changes the power parameter dynamically by introducing a power ramping counter and beam switching detection mechanism. When beam switching occurs or pathloss changes, the system recalculates transmission power using updated parameters. This allows the system to adapt power levels to actual channel conditions, avoiding both excessive power consumption and insufficient signal strength.
2Reliability
If uplink transmission power is increased to ensure reliable communication in beamforming scenarios, then communication reliability is improved, but unnecessary power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal monitors beam switching events and power ramping counter values, and adjusts transmission power accordingly. The base station provides feedback through random access response messages that indicate whether beam switching occurred, allowing the terminal to optimize power consumption based on actual communication needs rather than continuously transmitting at high power.
Solution Approach 2:
The system dynamically adjusts power consumption by linking it to actual communication events. Power is increased only when necessary (during beam switching or when random access attempts fail), and reduced when communication conditions are good. This dynamic power management ensures communication reliability while minimizing unnecessary energy consumption during stable transmission periods.
3Reliability
If power ramping is continuously applied to maintain connection in challenging radio conditions, then connection reliability is improved, but uplink interference and power consumption increase
Solution Approach 1:
The patent applies power ramping periodically rather than continuously, triggering it only on specific events such as beam switching or random access preamble retransmissions. The power ramping counter is reset and incremented only when necessary, creating a periodic action pattern that maintains connection reliability during critical moments while avoiding continuous energy loss during stable communication periods.
Data Source
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AI summary
The present disclosure relates to a communication scheme for convergence of an IoT technology and a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to an intelligent service (for example, a smart phone, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, a security and security related service, or the like) on the basis of a 5G communication technology and an IoT related technology. The present invention proposes a method and an apparatus for minimizing an uplink interference and avoiding unnecessary transmission power consumption of a terminal, by defining a method for setting uplink transmission power of the terminal in a mobile communication system. According to the present invention, a method for a terminal in a wireless communication system comprises the steps of: transmitting a random access preamble; receiving a random access response including a power control command; determining transmission power of uplink data on the basis of whether a beam through which the random access preamble has been transmitted is changed; and transmitting the uplink data on the basis of the transmission power.