5G Terminal HARQ-ACK Codebook for SPS PUCCH Collisions
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Solution Overview
Problem
In 5G wireless communication systems, PDSCH scheduled by Semi-Persistent Scheduling (SPS) can cause collisions between Physical Uplink Control Channel (PUCCH) for transmitting Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) and Downlink or flexible symbols, leading to unclear configuration of HARQ-ACK codebooks when transmission is delayed.
Innovation Solution
A terminal is equipped with a reception unit to receive data via SPS, a control unit to determine and configure HARQ-ACK feedback information, and a transmission unit to transmit the feedback information once a valid uplink resource is found, using priority-based HARQ-ACK codebook configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK transmission is postponed until a valid uplink resource is found, then the feedback information can be transmitted successfully, but the configuration of HARQ-ACK codebook becomes unclear
Solution Approach 1:
The patent applies preliminary action by determining and configuring the HARQ-ACK codebook in advance, before the actual feedback transmission occurs. The terminal determines the codebook based on the SPS PDSCH reception timing and the scheduled PUCCH resource, even when the transmission may be postponed. This ensures the codebook configuration is established beforehand, resolving the uncertainty that would otherwise occur when transmission is delayed.
Solution Approach 2:
The patent implements dynamics by making the codebook configuration adaptive to the actual transmission timing. The terminal determines whether to use a first codebook or a second codebook based on whether the PUCCH resource collides with downlink or flexible symbols. This dynamic selection allows the system to adjust the codebook configuration according to the actual channel conditions and resource availability, maintaining clarity while enabling successful postponed transmission.
2Reliability
If PUCCH for transmitting HARQ-ACK collides with DL symbols or flexible symbols, then the transmission timing must be delayed, but this causes uncertainty in codebook configuration
Solution Approach 1:
The patent applies preliminary action by determining the codebook configuration in advance, before the transmission delay occurs. The terminal identifies the collision between PUCCH and DL/flexible symbols and pre-determines which codebook to use based on the SPS PDSCH reception timing and the scheduled PUCCH resource, eliminating uncertainty even though the actual transmission is postponed.
Solution Approach 2:
The patent uses the codebook configuration as an intermediary that bridges the gap between the SPS PDSCH reception and the actual HARQ-ACK transmission. By establishing the codebook configuration based on intermediate parameters (SPS PDSCH timing and PUCCH resource scheduling), the system can handle the transmission delay caused by symbol collisions while maintaining proper feedback structure.
3Reliability
If HARQ-ACK transmission is delayed to find valid uplink resource, then transmission success is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by determining the codebook configuration in advance, before the transmission delay occurs. This allows the terminal to prepare the feedback structure ahead of time, reducing the actual processing delay once the valid uplink resource is found and enabling faster resumption of transmission.
Data Source
AI summary
A terminal includes: a reception unit configured to receive data according to SPS (Semi persistent scheduling) from a base station; a control unit configured to determine HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback information corresponding to the data, wherein transmission of the HARQ-ACK feedback information is required to be postponed until a valid uplink resource is found, configure a HARQ-ACK codebook related to the feedback information, and determine bits of the feedback information by applying the codebook; and a transmission unit configured to transmit the feedback information to the base station. The control unit configures the codebook based on priorities configured to the bits.