HARQ Feedback Resource Allocation for 5G Groupcast Sidelink
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Solution Overview
Problem
In 5G communication systems, efficiently configuring HARQ feedback resources for groupcast communication is challenging, particularly in scenarios where multiple user equipment (UEs) participate, as existing methods lack a systematic approach to allocate and manage HARQ feedback resources effectively.
Innovation Solution
The method involves configuring a unique HARQ identifier for each UE within a groupcast group, allowing UEs to transmit and receive HARQ responses using dedicated HARQ feedback resources, which are independently managed and reconfigured as UEs join or leave the group, ensuring efficient HARQ response transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If HARQ feedback resources are allocated for multiple UEs in groupcast communication, then the system supports more users and improves communication coverage, but the resource management complexity increases and systematic allocation methods are lacking
Solution Approach 1:
The patent segments HARQ feedback resources by assigning unique HARQ identifiers to different UEs or UE groups. Each UE or group is allocated specific feedback resources (time, frequency, code domains) identified by their unique HARQ ID, enabling systematic management of multiple UEs without resource conflicts. This segmentation approach directly resolves the contradiction by organizing resources for multiple users through structured identification and allocation.
2Productivity
If dedicated HARQ feedback resources are assigned to each UE, then HARQ response transmission efficiency improves, but the system requires dynamic reconfiguration when UEs join or leave the group
Solution Approach 1:
The patent implements dynamic HARQ resource allocation where the network can reconfigure HARQ identifiers and associated feedback resources when UEs join or leave the groupcast. The system dynamically updates HARQ ID mappings and notifies affected UEs, allowing efficient adaptation to group changes while maintaining dedicated feedback resources for each UE. This dynamic approach resolves the contradiction by enabling both efficient dedicated resource usage and flexible adaptation to changing group composition.
3Ease of operation
If a systematic approach to allocate HARQ feedback resources is implemented, then resource management becomes more efficient, but the configuration and signaling overhead increases
Solution Approach 1:
The patent uses a universal HARQ identifier mechanism that can serve multiple functions: identifying UEs, allocating feedback resources, and managing group membership. The HARQ ID system provides a unified framework for resource management across different scenarios (individual UE feedback, group feedback, dynamic joining/leaving), reducing the need for separate configuration mechanisms and thereby limiting signaling overhead while maintaining systematic management efficiency.
Data Source
AI summary
Disclosed are a method and apparatus for transmitting and receiving an HARQ response in a communication system. An operation method of a first terminal comprises the steps of: configuring a first HARQ identifier mapped to a first HARQ feedback resource; transmitting, to a second terminal, a message including the first HARQ identifier; transmitting sidelink data to a plurality of terminals belonging to a groupcast group in a groupcast method; and receiving, from the second terminal, an HARQ response to the sidelink data in the first HARQ feedback resource mapped to the first HARQ identifier.