Sidelink Retransmission Resource Selection via Position Restriction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink retransmissions, particularly in device-to-device (D2D) communication, where retransmissions can burden user equipment (UEs) and inefficiently manage resources based on UE capabilities.
Innovation Solution
A method for user equipment (UE) to select retransmission resources by restricting the selection based on the position of the initial transmission resource, allowing for efficient HARQ combining when the interval between transmissions is less than a predetermined value, and excluding previously used resources to prevent excessive buffering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If retransmission resources are selected without restriction, then resource availability is improved, but UE buffering burden increases
Solution Approach 1:
The patent segments the resource selection process into two parts: initial transmission resource selection and retransmission resource selection. The retransmission resource is selected from a restricted set that is segmented based on the initial resource position, rather than allowing selection from all available resources. This segmentation reduces the buffering burden while maintaining adequate resource availability.
Solution Approach 2:
The patent applies preliminary action by pre-defining the relationship between initial transmission resources and retransmission resources. The retransmission resource pool is predetermined based on the initial resource position, so that when retransmission is needed, the UE can immediately select from the pre-established restricted pool without requiring extensive buffering of all possible resources.
2Device complexity
If retransmission resources are restricted based on initial transmission position, then UE buffering is reduced, but resource selection flexibility decreases
Solution Approach 1:
The patent introduces dynamics by making the retransmission resource pool adaptive to the initial transmission resource position. Rather than a fixed restricted pool, the available retransmission resources dynamically shift based on where the initial transmission occurred. This maintains flexibility while keeping the pool size manageable for UE buffering.
Solution Approach 2:
The patent changes the parameter of resource pool size and composition based on the initial transmission resource position. By adjusting which resources are included in the retransmission pool according to the initial position, the system maintains adaptability while controlling the buffering requirements. The parameter change allows the system to balance flexibility and complexity.
3Reliability
If HARQ combining is performed for all retransmissions, then transmission reliability is improved, but processing complexity at UE increases
Solution Approach 1:
The patent applies partial action by performing HARQ combining only for retransmissions that fall within the restricted resource pool defined relative to the initial transmission. Not all possible retransmissions are combined - only those that meet the positional criteria. This partial combining approach maintains reliability for valid retransmissions while reducing processing complexity compared to combining all retransmissions regardless of resource position.
Data Source
AI summary
One embodiment of the present invention relates to a method whereby a first terminal transmits and receives sidelink signals in a wireless communication system, the sidelink signal transmission and reception method comprising the steps of: selecting a resource for executing a second transmission, the selection of which is restricted by the position of a resource selected for a first transmission; and executing the second transmission in the resource selected for the second transmission.