NR V2X Resource Allocation With Conditional Uplink Feedback
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Solution Overview
Problem
Existing NR V2X communication systems face challenges in resource allocation that lead to transmission delays and resource wastage, particularly in scenarios requiring retransmissions for unsuccessful data decoding.
Innovation Solution
A method for resource allocation in NR V2X communication that includes determining and transmitting sets of resources comprising SL transmission, SL feedback, and uplink feedback resources, with uplink feedback only triggered upon successful decoding, to optimize resource utilization and reduce delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Tx UE transmits transport blocks on SL resources and always expects feedback, then the receiving UE can provide feedback for every transmission, but unnecessary feedback is generated when decoding is already successful, leading to resource waste and increased delay
Solution Approach 1:
The patent extracts the uplink feedback transmission from the mandatory feedback process and makes it conditional. Only when the SL feedback indicates unsuccessful decoding does the Tx UE transmit NACK on uplink feedback resources. This removes unnecessary feedback transmissions when decoding is already successful, reducing resource waste and delay while maintaining reliability.
Solution Approach 2:
The patent changes the feedback transmission parameter from always transmitting to conditionally transmitting based on decoding success. The uplink feedback is transmitted only when the SL feedback indicates unsuccessful decoding, transforming the feedback mechanism from a continuous process to a selective one, thereby reducing unnecessary transmissions and associated delays.
2Reliability
If uplink feedback resources are allocated for every transport block, then feedback can always be transmitted, but resources are wasted when feedback is not needed, reducing resource allocation efficiency
Solution Approach 1:
The patent extracts the uplink feedback transmission from the mandatory feedback process and makes it conditional. Only when the SL feedback indicates unsuccessful decoding does the Tx UE transmit NACK on uplink feedback resources. This removes unnecessary feedback transmissions when decoding is already successful, reducing resource waste and delay while maintaining reliability.
Solution Approach 2:
The system uses the SL feedback information to self-determine whether uplink feedback transmission is necessary. The Tx UE autonomously decides based on the SL feedback whether to transmit NACK on uplink resources, eliminating the need for continuous uplink feedback transmissions and improving resource allocation efficiency.
3Reliability
If retransmissions are performed for every unsuccessful decoding attempt, then data delivery reliability is improved, but transmission delay increases for delay-sensitive V2X services
Solution Approach 1:
The patent changes the retransmission trigger parameter from every decoding attempt to only when SL feedback indicates unsuccessful decoding. This selective retransmission approach maintains data delivery reliability by ensuring retransmissions occur when needed while reducing unnecessary retransmissions that would increase delay for time-sensitive V2X communications.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for resource allocation in vehicle to everything (V2X) communication. According to an embodiment of the present disclosure, a method may include: determining resource allocation information indicating at least one set of resources for a set of transport blocks; and transmitting the determined resource allocation information. Each set of resources is associated with a transport block of the set of transport blocks to be transmitted on sidelink. Each set of resources may include: a plurality of sidelink transmission resources, each sidelink transmission resource being configured to carry a sidelink transmission of the transport block; a plurality of sidelink feedback resources, each sidelink feedback resource being configured to carry sidelink feedback information in response to the sidelink transmission of the transport block; and a plurality of uplink feedback resources, at least one of the plurality of uplink feedback resources being configured to carry uplink feedback information in response to the sidelink transmission of the transport block only in the case that the sidelink feedback information represents that the transport block has been successfully decoded.