Sidelink Grant Selection for D2D Resource Pool Optimization
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Solution Overview
Problem
Current D2D communication systems face challenges in efficiently selecting sidelink grants for D2D UE, particularly in managing available sidelink data transmission across SC periods, leading to suboptimal data handling and resource utilization.
Innovation Solution
A method and device for configuring a resource pool to select sidelink grants, where a first set of grants is used for the initial SC period, and a second set is selected from the same pool if remaining grants are insufficient, with the second set associated with a subsequent SC period starting at least 4 subframes after the initial selection, optimizing data transmission across periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single set of sidelink grants is selected for the current SC period, then the selection process is simple, but available sidelink data cannot be fully transmitted when data volume exceeds remaining grant capacity
Solution Approach 1:
The patent segments the sidelink grant selection into multiple stages: first selecting grants for the current SC period, then conditionally selecting additional grants for the next SC period if data remains. This segmentation allows the system to handle large data volumes by dividing the transmission across time periods while maintaining manageable selection complexity at each stage.
Solution Approach 2:
The patent performs preliminary selection of sidelink grants for the current SC period before determining whether additional grants are needed. This preliminary action allows the system to assess remaining data volume and make informed decisions about whether to proceed to the next selection stage, optimizing resource allocation in advance.
2Reliability
If sidelink grants are selected without considering remaining grant capacity, then the selection process is fast, but data transmission completeness is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors the capacity of selected sidelink grants against the total available sidelink data. Based on this feedback, it determines whether to select additional grants in the next SC period. This feedback loop ensures complete data transmission while maintaining efficient timing by only performing additional selections when necessary.
Solution Approach 2:
The patent makes the grant selection process dynamic by conditionally proceeding to the next SC period based on remaining data volume. The system adapts its selection behavior: performing single-period selection when data fits, and multi-period selection when data exceeds capacity. This dynamic approach balances transmission completeness with selection time efficiency.
3Quantity of substance
If multiple sets of sidelink grants are selected across SC periods, then complete data transmission is achieved, but resource utilization becomes suboptimal
Solution Approach 1:
The patent changes the temporal parameter of grant selection by extending selections across multiple SC periods when necessary. Instead of being constrained to a single period, the system adjusts the time parameter to include the next SC period's grants when data volume requires it. This parameter change ensures complete transmission while maintaining efficient resource use by only extending the selection window when data demands it.
Data Source
Figure 1~2A
Figure 2B
Figure 3(a)~4
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for selecting of sidelink grant for a D2D UE in a D2D communication system, the method comprising: configuring a resource pool in which the UE selects a sidelink grant for transmitting sidelink data; and selecting a first set of sidelink grants for a first Sidelink Control period (SC period) from the resource pool to transmit a sidelink data; and selecting a second set of sidelink grants for a second SC period from the resource pool if amount of available sidelink data cannot be transmitted using remaining sidelink grants among the first set of sidelink grants in the first SC period, wherein the remaining sidelink grants among the first set of sidelink grants are sidelink grants configured in one or more subframes within the first SC period starting from a subframe in which the UE selects the second sidelink grant to a last subframe of the first SC period.