D2D Scheduling Subframe Allocation for Wireless Power Control
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in efficiently transmitting control information for Device-to-Device (D2D) direct communication, requiring innovative methods to manage scheduling messages and power control within the system.
Innovation Solution
A method for performing D2D direct communication by detecting scheduling messages in specific subframes and using indicators to determine transmission or reception roles, with the scheduling message including power control information, and transmitting ACK/NACK signals to base stations, allowing for efficient D2D communication scheduling across multiple subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scheduling messages are transmitted in every subframe, then D2D communication reliability is improved, but system power consumption increases
Solution Approach 1:
The patent implements periodic transmission of scheduling messages at specific subframe intervals rather than continuous transmission. The base station configures specific subframes for D2D scheduling message transmission, creating a periodic pattern that reduces overall system power consumption while maintaining reliable D2D communication through regular scheduling opportunities.
Solution Approach 2:
The base station performs preliminary configuration of D2D communication parameters, including scheduling message transmission timing and power control settings, before actual D2D communication occurs. This preliminary setup allows UEs to efficiently prepare for D2D operations without requiring continuous control signaling, thereby reducing power consumption while ensuring communication reliability.
2Reliability
If power control information is included in every scheduling message, then D2D transmission quality is improved, but control information overhead increases
Solution Approach 1:
The patent applies power control information selectively rather than uniformly to all D2D transmissions. The base station determines which UEs require power control adjustments and includes power control information only in the relevant scheduling messages, thereby reducing overall control information overhead while maintaining transmission quality where needed.
Solution Approach 2:
The patent dynamically adjusts power control parameters based on channel conditions and D2D communication requirements. By changing power control parameters only when necessary rather than continuously, the system maintains transmission quality while minimizing control information overhead in scheduling messages.
3Reliability
If search region for scheduling messages is activated in all subframes, then D2D scheduling reliability is improved, but UE processing complexity increases
Solution Approach 1:
The patent divides the subframe structure into specific segments where D2D scheduling message search regions are activated only in designated subframes. This segmentation approach allows UEs to focus their processing on specific subframes rather than continuously searching all subframes, thereby reducing UE processing complexity while maintaining scheduling reliability through adequate search opportunities.
Data Source
AI summary
The present invention relates to a method for performing direct D2D communication by means of a first device in a wireless communication system. In particular, the method includes the steps of: detecting a scheduling message from a plurality of first subframes in which the search region of the scheduling message for D2D direct communication is activated; and performing direct D2D communication with a second device in a second subframe on the basis of the scheduling message, wherein the scheduling message includes an instructor instructing the direct D2D communication.