Uplink Power Control for IoT Coverage Enhancement
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Solution Overview
Problem
Low-cost MTC UEs require enhanced coverage in challenging environments like shadow areas or underground locations, where limited antennas and functions lead to deteriorated reception performance, necessitating improved communication performance and interference reduction.
Innovation Solution
A method and device for controlling uplink transmission power in wireless communication systems, involving power control adjustment based on repetition levels for coverage enhancement, where the base station configures and updates power control values for terminals to optimize transmission power and reduce inter-UE interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If low-cost MTC UEs use limited antennas and functions to reduce device complexity and cost, then device complexity is reduced, but reception performance deteriorates in challenging environments
Solution Approach 1:
The patent combines multiple repeated transmissions of the same uplink signal across different subframes to achieve signal accumulation and diversity gain. By merging the energy and information from multiple transmissions, the system compensates for the limited antenna capability and achieves improved reception performance without increasing device complexity
Solution Approach 2:
The patent implements periodic repeated transmissions of uplink signals at configured intervals (repetition levels). This periodic transmission strategy allows the receiver to accumulate signal energy over time and exploit time diversity, thereby improving reception reliability for low-cost UEs with limited antennas
2Area of stationary object
If transmission power is increased to enhance coverage in high path-loss areas, then coverage is extended, but inter-UE interference increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on configured repetition levels and path-loss conditions. By optimizing the power allocation across multiple repeated transmissions rather than using high power continuously, the system extends coverage to high path-loss areas while controlling overall interference levels through precise power parameter management
Solution Approach 2:
The patent implements power control mechanisms where the base station provides feedback to adjust UE transmission power based on received signal quality and interference conditions. This feedback loop enables the system to extend coverage by adjusting power levels adaptively while minimizing inter-UE interference through real-time power optimization
3Area of stationary object
If repeated transmissions are performed to enhance coverage, then coverage is improved, but power consumption increases
Solution Approach 1:
The patent applies partial repetition strategies where only the necessary number of transmissions are performed to achieve adequate coverage, rather than excessive repetitions. By configuring appropriate repetition levels based on channel conditions and UE capability, the system achieves sufficient coverage enhancement while minimizing unnecessary power consumption from redundant transmissions
Data Source
AI summary
Disclosed are a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The disclosed technique and system can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retailing, security and safety related services, and the like) on the basis of 5G communication technology and IoT related technology. A method for controlling uplink transmission power of a terminal in a wireless communication system comprises the steps of: initializing a power control adjustment value when a repetition level for a coverage enhancement mode is changed; updating the power control adjustment value according to a transmission power control (TPC) command received from a base station; calculating uplink transmission power on the basis of the updated power control adjustment value and the repetition level; and transmitting uplink data or control information by the calculated uplink transmission power.