Uplink Power Control for MTC Devices
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing uplink transmit power for machine-type communication (MTC) devices, particularly in maintaining effective communication and reducing battery consumption, due to intermittent data transmission and limited data volume, which affects synchronization and channel estimation.
Innovation Solution
The method involves calculating a maximum power reduction value for uplink channels and applying it across subframes, with power adjustments based on frequency resources and channel conditions, using techniques like timing advance and transmit power control within a reference signal combining window to maintain channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices transmit uplink channels using maximum transmit power without power reduction, then communication reliability is improved, but battery consumption increases and device complexity increases due to frequent power adjustments
Solution Approach 1:
The patent pre-calculates and determines the maximum power reduction value before actual uplink transmission occurs. By determining the appropriate power reduction level in advance based on device capabilities and channel conditions, the system avoids frequent power adjustments during transmission, thereby reducing battery consumption while maintaining communication reliability.
Solution Approach 2:
The patent introduces a power reduction parameter (maximum power reduction value) that modifies the transmit power level. By changing the power parameter from maximum to a reduced level based on calculated values, the system achieves energy savings while maintaining adequate communication performance through optimized power allocation.
2Adaptability or versatility
If MTC devices apply frequent power adjustments to adapt to channel conditions, then communication adaptability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary determination of the maximum power reduction value before transmission, establishing power control parameters in advance. This preliminary action reduces the need for complex real-time power adjustments during transmission, simplifying device operations while maintaining adaptability to channel conditions.
Solution Approach 2:
The MTC device autonomously determines its own maximum power reduction value based on pre-configured parameters and channel conditions. This self-service approach eliminates the need for complex centralized power control mechanisms, reducing device complexity while maintaining communication adaptability through autonomous power management.
3Use of energy by moving object
If MTC devices use intermittent data transmission to save power, then battery life is extended, but synchronization accuracy deteriorates and channel estimation precision decreases
Solution Approach 1:
The patent modifies transmission parameters by introducing controlled power reduction values that allow intermittent transmission at optimized power levels. By carefully selecting power reduction parameters, the system maintains adequate signal strength for accurate channel estimation and synchronization even during intermittent transmission periods, thereby extending battery life without sacrificing measurement precision.
Data Source
AI summary
The present invention relates to a wireless communication system. Specifically, the present invention may comprises: a step of a terminal calculating a first maximum power reduction value to be applied to a first uplink channel; and a step of transmitting, from a plurality of subframes, the first uplink channel at the maximum transmission power by applying the first maximum power reduction value. The first uplink channel is transmitted through different frequency resources within the plurality of subframes. The maximum transmission power value has different values according to frequency resources through which specific channels are transmitted. The first maximum power reduction value is a predetermined value applied during the transmission of the first uplink channel.