HARQ Feedback Resource Allocation for Collision Avoidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In telecommunications, Hybrid Automatic Repeat Request (HARQ) feedback transmissions often face issues such as cancellation due to resource overlap or collision, leading to dropped feedbacks and inefficiencies in spectrum usage, particularly in scenarios like time division duplex systems and semi-persistent scheduling.
Innovation Solution
An enhanced HARQ feedback mechanism is introduced, allowing for out-of-order HARQ-ACK retransmissions and multiplexing of retransmitted and initial HARQ-ACKs on the same PUCCH resource, with clear priority definitions and dynamic resource allocation to mitigate these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted on PUCCH resource, then feedback reliability is improved, but resource collision and cancellation occur leading to feedback loss
Solution Approach 1:
The patent implements dynamic HARQ feedback transmission by allowing flexible switching between initial transmission and retransmission modes based on real-time resource availability. The terminal device dynamically determines whether to transmit HARQ feedback on originally allocated resources or on alternative resources indicated by downlink control information, thereby adapting to changing channel conditions and resource conflicts.
Solution Approach 2:
The patent introduces downlink control information as an intermediary mechanism that mediates between the terminal device and network device for HARQ feedback resource allocation. The downlink control information carries resource indication information that resolves resource conflicts by dynamically allocating alternative transmission resources, acting as a mediator to prevent feedback loss due to resource collision.
2Reliability
If HARQ feedback retransmission is implemented, then feedback delivery reliability is improved, but transmission overhead and system complexity increase
Solution Approach 1:
The patent makes the downlink control information serve multiple functions: it not only schedules data transmissions but also carries resource indication information for HARQ feedback transmission. This multi-functional design eliminates the need for separate signaling mechanisms for feedback resource allocation, reducing overall system complexity while maintaining reliable feedback delivery through retransmission capabilities.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device comprise a processor configured to perform: receiving, from a network device, information indicating a first resource for initial transmission of a first HARQ feedback for a first data transmission; receiving, from the network device, a first DCI indicating a second resource for retransmission of the first HARQ feedback; receiving, from the network device, a second DCI indicating a third resource for initial transmission of a second HARQ feedback for a second data transmission scheduled later than the first data transmission, wherein a priority of the first HARQ feedback is the same as a priority of the second HARQ feedback; and transmitting, to the network device, the first HARQ feedback on the second resource. In this way, the spectrum efficiency and system performance can be improved.