D2D Resource Allocation for Interference Avoidance in Wireless Terminals
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Solution Overview
Problem
Devices with limited frequency band capability face challenges in performing Device-to-Device (D2D) operations due to interference and increased power consumption, especially when trying to maintain synchronization with a base station or perform pathloss measurements, leading to suspended communications.
Innovation Solution
A D2D operation method where a first UE receives information about specific resources where a second UE cannot receive signals and performs D2D operations within remaining resources, excluding those resources, and prioritizes discovery over communication, allowing for smoother and more power-efficient operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE with limited frequency band capability performs D2D operation on the same resource as base station signal reception, then resource utilization is improved, but reception quality deteriorates due to interference
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands, allowing the UE to receive base station signals on one sub-band while performing D2D operations on other sub-bands. This frequency-domain segmentation enables simultaneous operations without mutual interference, resolving the contradiction between resource utilization and reception quality.
Solution Approach 2:
The patent introduces frequency dimension separation by allocating different sub-bands for different operations. Instead of time-division or spatial separation, the solution moves to frequency-domain multiplexing, allowing D2D and base station communications to occur simultaneously on different frequency resources without interfering with each other.
2Reliability
If a UE performs pathloss measurement and synchronization with base station during D2D operation, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic pathloss measurement and synchronization operations rather than continuous operations. The UE performs these measurements at specific intervals or at designated reference signals, reducing the overall power consumption while maintaining adequate communication reliability through periodic updates of channel state information.
Solution Approach 2:
The patent performs pathloss measurement and synchronization operations in advance before D2D communication begins, or at predetermined timing points. This preliminary action ensures that the channel state is known beforehand, allowing the UE to maintain reliable communication without continuously monitoring, thereby reducing power consumption during the actual D2D operation.
3Productivity
If D2D communication is prioritized over discovery, then communication efficiency is improved, but device discoverability deteriorates
Solution Approach 1:
The patent implements periodic discovery signal transmissions at predetermined intervals or timing points, separate from continuous D2D communication. This periodic discovery mechanism ensures that devices remain discoverable to potential partners while maintaining efficient ongoing communication, resolving the contradiction between communication efficiency and discoverability.
Solution Approach 2:
The patent performs discovery operations in advance before establishing D2D communication links. Devices transmit and monitor discovery signals during initial phases to establish connectivity, after which the system transitions to efficient communication mode. This preliminary discovery action ensures devices are found and connected before prioritizing communication efficiency.
Data Source
AI summary
Provided are a device to device (D2D) operation method of a terminal in a wireless communication system, and a terminal using the method. In the method, the terminal receives, from another terminal which is the object of a D2D operation, first information and performs the D2D operation on the basis of the first information, wherein the first information indicates a specific resource in which the other terminal cannot receive a signal transmitted from the terminal, and the terminal performs the D2D operation within the remaining resources excluding the specific resource.