Relay Terminal D2D Signal Link Selection
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Solution Overview
Problem
Current wireless access systems face challenges in efficiently supporting device-to-device (D2D) communication, particularly in configuring relay user equipment (rUE) and selecting optimal links for D2D signal transmission, which affects the reliability and efficiency of D2D relay communication.
Innovation Solution
The method involves configuring a relay user equipment (rUE) to receive relay mode configuration information and scheduling information on multiple resource pools, allowing it to relay D2D signals via both access and one-hop D2D links, with the ability to select the most suitable link based on transmission mode, data type, priority, and transmission count ratio, ensuring efficient D2D signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a relay UE transmits D2D signals on both access link and one-hop D2D link simultaneously, then the coverage and connectivity are improved, but the transmission reliability deteriorates due to resource conflict and interference
Solution Approach 1:
The patent segments the resource pools into first resource pool for access link and second resource pool for one-hop D2D link. This segmentation prevents resource conflict by allocating dedicated resources to each link type, thereby maintaining transmission reliability while enabling multi-link operation for improved coverage and connectivity.
Solution Approach 2:
The patent applies different transmission modes to different links based on their specific requirements. The access link uses one transmission mode while the one-hop D2D link uses another transmission mode, optimizing each link's performance characteristics locally while maintaining overall system reliability.
2Productivity
If the relay UE uses a single resource pool for both access link and one-hop D2D link, then the resource utilization efficiency is improved, but the transmission reliability deteriorates due to resource conflict
Solution Approach 1:
The patent divides the resource pool into separate first and second resource pools for access link and one-hop D2D link respectively. This segmentation eliminates resource conflict between links while maintaining efficient resource utilization through dedicated allocation, resolving the contradiction between productivity and reliability.
3Device complexity
If the relay UE transmits D2D signals without link selection based on transmission mode, then the device complexity is reduced, but the transmission reliability deteriorates due to inappropriate link selection
Solution Approach 1:
The patent implements dynamic link selection based on transmission mode. The relay UE selects between access link and one-hop D2D link according to the specific transmission mode requirements, making the system adaptive rather than static. This dynamic approach improves reliability without excessive complexity by using clear selection criteria based on transmission mode.
Data Source
AI summary
Provided are methods for, in a wireless access system supporting device-to-device (D2D) communication, configuring a relay terminal and selecting a link through which the relay terminal can efficiently transmit a D2D signal, and devices for supporting same. A method for effectively transmitting a D2D signal by a relay terminal in a wireless access system supporting D2D communication, according to an embodiment of the present invention, comprises the steps of: receiving relay mode configuration information from a base station; receiving scheduling information about a first resource pool and a second resource pool from the base station; relaying a D2D signal through an access link in the first resource pool; and transmitting the D2D signal through a one-hop D2D link in the second resource pool. The relay terminal is connected to both of the access link and the one-hop D2D link, wherein the access link can be configured for D2D relay communication with the base station, and the one-hop D2D link can be configured for D2D direct communication with another terminal.