HARQ Codebook Construction for Overlapping PUCCH Priorities
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Solution Overview
Problem
In existing communication systems, the overlapping of physical uplink control channel (PUCCH) transmissions for hybrid automatic repeat request (HARQ) feedbacks with different priorities results in the dropping of lower priority transmissions, degrading the performance of associated services.
Innovation Solution
A method for constructing a HARQ codebook that includes HARQ feedbacks with no overlapping positions for the same slot, allowing transmission on an uplink control channel, thereby reducing unnecessary redundancy and ensuring both high-priority and low-priority feedbacks are transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PUCCH transmissions are constructed for HARQ-ACK with different priorities, then the reliability and latency requirements of high priority services are met, but the performance of low priority services is degraded due to transmission dropping
Solution Approach 1:
The patent merges multiple HARQ-ACK codebooks with different priorities into a single unified PUCCH transmission. Instead of transmitting separate PUCCHs for high and low priority services (which causes overlapping and dropping), the invention combines them into one codebook structure that can be transmitted simultaneously, eliminating the transmission conflict while maintaining priority differentiation through separate codebook construction within the unified transmission.
2Loss of time
If one PUCCH transmission is selected for higher priority HARQ-ACK, then low latency and high reliability are achieved for high priority services, but the lower priority PUCCH transmission is dropped
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple priority levels (high priority and low priority codebooks) within a single unified codebook structure. This segmentation allows the system to maintain separate timing and construction rules for different priorities while transmitting them together, ensuring that high priority feedback meets latency requirements without causing complete loss of low priority feedback information.
Solution Approach 2:
The unified HARQ-ACK codebook acts as an intermediary structure that mediates between high and low priority transmissions. Instead of directly conflicting PUCCH transmissions, the intermediary codebook structure allows both priorities to be represented and transmitted together, with the network device able to distinguish and process different priority levels from the combined codebook.
3Adaptability or versatility
If separate PUCCH configurations are used for different priorities, then priority-specific requirements are met, but transmission overlap occurs in time domain
Solution Approach 1:
The patent creates a universal PUCCH transmission framework that handles multiple priorities within a single transmission mechanism. The unified codebook structure serves multiple functions: it maintains priority-specific timing configurations, accommodates different service requirements, and prevents time-domain overlap by coordinating the transmission of all priorities through one standardized PUCCH resource allocation process.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device receives, from a network device, a first timing value set associated with a first HARQ feedback with a first priority, a second timing value set associated with a second HARQ feedback with a second priority different from the first priority, and a TDRA list for the first and second HARQ feedbacks, determines a third timing value set from the first and second timing value sets, constructs a HARQ codebook comprising the first and second HARQ feedbacks at least based on the third timing value set and the TDRA list, and transmits the HARQ codebook to the network device on an uplink control channel. In this way, unnecessary redundancy in HARQ bits can be removed and UCI overhead can be reduced.