Sidelink Groupcasting With UE-Specific HARQ Adaptation
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Solution Overview
Problem
In wireless communication networks, groupcast communication over sidelink using hybrid automatic repeat request (HARQ) feedback faces challenges due to inaccuracies in group member information, leading to unnecessary retransmissions and overall process failures when the number of proximal group members is less than the common group size.
Innovation Solution
The method involves adapting the HARQ process by incorporating Tx UE-specific group information, obtained from the application layer, to dynamically adjust sidelink channel resources and ignore or exclude non-proximal group members, thereby optimizing HARQ operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common group information is used for all UEs in the group, then groupcast communication can be established, but unnecessary retransmissions occur when the number of proximal group members is less than the common group size
Solution Approach 1:
The transmitting UE obtains application layer information about the actual number of proximal group members before initiating HARQ operations. This preliminary knowledge allows the UE to configure the HARQ process with accurate group size information, preventing unnecessary retransmissions to non-proximal members and ensuring reliable delivery to all proximal members.
Solution Approach 2:
The patent introduces dynamic adaptation of HARQ parameters based on real-time group composition. The transmitting UE adjusts the HARQ group size dynamically according to the actual number of proximal members, rather than using a fixed common group size. This dynamic configuration optimizes both reliability and efficiency by matching the HARQ process to the current operational context.
2Productivity
If the HARQ process continues with common group size information, then the process may complete, but it leads to overall process failures when group member information is inaccurate
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting UE uses application layer information about proximal group members to validate and adjust HARQ process parameters. This feedback loop ensures that the HARQ process is configured with accurate group size information, preventing both unnecessary completions and actual failures. The feedback from the application layer about real-time group composition directly influences the HARQ configuration.
3Productivity
If updated group information is received during ongoing transmission, then resource allocation can be optimized, but the transmission process complexity increases
Solution Approach 1:
The transmitting UE obtains application layer information about proximal group members in advance, before initiating the HARQ transmission process. This preliminary acquisition of accurate group size information allows for optimal resource allocation from the start, eliminating the need for mid-transmission adjustments and reducing overall process complexity while maintaining high efficiency.
Data Source
AI summary
The method includes a processor of a first UE receiving first group information for a user group with user-device members, the first group information including information for mapping a sidelink channel resource for each of the user-device members to perform a groupcast communication over sidelink for the user group, the first UE being a user-device member of the user group. The method further includes receiving second group information for transmitting data within the groupcast communication, the second group information including updated information of the first group information that is specific to the first UE, initiating a first transmission process to transmit a first data block to the user group for the groupcast communication over the sidelink based on the first group information, and adapting the first transmission process of the first data block based on the second group information.