PSFCH Feedback Resource Indexing for Reliable NR V2V Groupcast
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing groupcast transmissions in vehicle-to-vehicle (V2V) communication, particularly in ensuring reliable acknowledgement feedback mechanisms for groupcast messages in New Radio (NR) networks.
Innovation Solution
Implementing a feedback mechanism for groupcast transmissions in V2V communication that includes acknowledgement feedback protocols within the NR user plane and control plane protocol stacks, utilizing specific acknowledgement feedback structures and procedures to enhance reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acknowledgement feedback mechanisms are implemented for groupcast transmissions in V2V communication, then reliability of data transmission is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements an acknowledgement feedback mechanism where receiving UEs send HARQ-ACK feedback to transmitting UEs for groupcast transmissions. The feedback is transmitted on PUCCH or PUSCH resources, enabling reliable data delivery through explicit confirmation of successful reception, directly resolving the reliability improvement while managing complexity through standardized feedback procedures
Solution Approach 2:
The patent segments the feedback mechanism by allowing different feedback modes (ACK/NACK/DTX) and separating feedback transmission into different uplink channels (PUCCH for scheduled resources, PUSCH for unscheduled resources). This segmentation manages device complexity by breaking down the feedback process into manageable, standardized components rather than requiring a monolithic complex system
2Reliability
If feedback resources are allocated for HARQ-ACK transmission in groupcast, then transmission reliability is improved, but loss of time for resource allocation and processing increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring feedback resources through RRC signaling before actual groupcast transmissions occur. The network configures PUCCH resources, PUSCH resources, and feedback timing parameters in advance, allowing UEs to immediately transmit acknowledgements without delays for resource negotiation during the transmission process, thus improving reliability while minimizing time loss
Solution Approach 2:
The patent implements periodic action through configured feedback timing where acknowledgements are transmitted at predetermined intervals and time points relative to the received groupcast data. This periodic structure allows the system to maintain reliable feedback loops while operating on efficient, pre-determined schedules rather than requiring continuous or ad-hoc resource allocation, reducing time loss
Data Source
AI summary
A destination wireless device receives, from a base station, configuration parameters of physical sidelink feedback channel (PSFCH) radio resources. The destination wireless device receives, from a source wireless device, sidelink control information comprising an identity (ID) of the source wireless device. The destination wireless device transmits, to the source wireless device, an acknowledgement for a transport block via a PSFCH radio resource having an index. The index is based on: the ID of the source wireless device, an ID of the destination wireless device, and a modulo operation performed on a quantity of the PSFCH radio resources.