D2D Transmit Power Control for In-Band Emission Reduction
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Solution Overview
Problem
Current D2D communication systems face in-band emission issues due to the use of maximum transmit power, leading to interference with adjacent frequency signals and reduced reception reliability, especially in hotspot areas and near base stations or receivers.
Innovation Solution
A transmit power control method that selects resources during the discovery period, determines if the selected resource meets a predetermined power control condition, and adjusts the transmit power accordingly to minimize interference and enhance reception reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maximum transmit power is used for D2D communication, then transmission coverage and signal strength are improved, but in-band emission increases causing interference with adjacent frequency signals
Solution Approach 1:
The patent changes the transmit power parameter from a fixed maximum value to a dynamically adjusted value based on resource block allocation. Specifically, when resource blocks are allocated at the edge of the frequency band, the transmit power is reduced to minimize in-band emission interference to adjacent frequency signals, while maintaining adequate signal strength for reliable communication.
2Reliability
If maximum transmit power is used for D2D communication, then discovery signal reliability is improved, but interference with legacy cellular systems increases
Solution Approach 1:
The patent applies local quality by differentiating transmit power levels based on the specific resource block allocation location. When resource blocks are allocated near the frequency band edge, the transmit power is locally reduced to protect legacy cellular systems from interference, while allowing maximum power in other regions where interference is not a concern.
3Object-generated harmful factors
If transmit power is reduced to minimize in-band emission, then interference with adjacent frequency signals is reduced, but reception reliability deteriorates
Solution Approach 1:
The patent applies partial action by reducing transmit power only when necessary (i.e., when resource blocks are allocated at frequency band edges where in-band emission would interfere with adjacent signals). In other scenarios where full power can be used without causing interference, maximum transmit power is maintained to ensure adequate reception reliability.
Data Source
AI summary
The present disclosure relates to a communication scheme for fusing IoT technology with a 5G communication system for supporting a data rate higher than that of a 4G system and subsequent systems thereafter. The present disclosure can be applied to intelligent services (for example, a smart home, a smart building, a smart city, a smart or connected car, healthcare, digital education, retail business, security and safety related services, and the like) on the basis of the 5G communication technology and IoT related technology. A method performed by a transmission terminal for transmitting a device-to-device (D2D) communication data is provided.