HARQ-ACK Codebook Handling for Unicast and Multicast SPS
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face challenges in efficiently handling hybrid automatic repeat request (HARQ) acknowledgment (ACK) codebook transmission, particularly in configuring and scheduling unicast and multicast physical downlink shared channels, which affects network performance and user equipment (UE) feedback mechanisms.
Innovation Solution
A method and user equipment (UE) configuration for handling HARQ-ACK transmission by receiving and transmitting Type-1 HARQ-ACK codebooks based on specific configurations for unicast and multicast semi-persistent scheduling physical downlink shared channels, enabling efficient HARQ-ACK feedback and retransmissions through dedicated and shared PUCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple configurations for unicast and multicast SPS PDSCH are maintained separately, then service flexibility and reliability are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent combines unicast and multicast SPS PDSCH configurations into a unified Type-1 HARQ-ACK codebook structure. The UE generates a single codebook that incorporates HARQ-ACK information for both unicast and multicast services, eliminating the need for separate codebook management and reducing configuration complexity while maintaining service-specific reliability requirements
Solution Approach 2:
The Type-1 HARQ-ACK codebook is designed as a universal feedback mechanism that handles both unicast and multicast HARQ-ACK transmissions. This multi-functional approach allows the same codebook structure to serve different service types (eMBB, mMTC, URLLC) with different reliability requirements, reducing the need for service-specific feedback mechanisms
2Productivity
If Type-1 HARQ-ACK codebook is used for unicast PDSCH, then feedback efficiency is improved, but processing time and complexity increase
Solution Approach 1:
The UE determines the Type-1 HARQ-ACK codebook in advance for unicast PDSCH receptions. By pre-generating the codebook structure and preparing HARQ-ACK bits before actual transmission, the system reduces real-time processing delays and enables faster feedback transmission, improving overall feedback efficiency while managing processing time through advance preparation
3Adaptability or versatility
If separate PUCCH resources are allocated for unicast and multicast, then resource allocation flexibility is improved, but resource overhead and scheduling complexity increase
Solution Approach 1:
The patent merges unicast and multicast PUCCH resource allocation into a unified framework. The same PUCCH resources are used for transmitting both unicast and multicast HARQ-ACK feedback, reducing resource overhead and simplifying scheduling while maintaining the ability to allocate resources flexibly based on service requirements and channel conditions
Data Source
AI summary
A UE and a method for handling HARQ-ACK codebook transmission are provided. The method includes receiving, from a BS, a first configuration for unicast configuration for unicast SPS PDSCH, a second configuration for multicast SPS PDSCH, and a third configuration for unicast PDSCH; receiving, from the BS, a PUCCH configuration for unicast; receiving DCI scheduling a unicast PDSCH; determining a Type-1 HARQ-ACK codebook corresponding to the unicast PDSCH based on the first configuration for unicast SPS PDSCH, the second configuration for multicast SPS PDSCH, and the third configuration for unicast PDSCH; and transmitting, to the BS, the Type-1 HARQ-ACK codebook corresponding to the unicast PDSCH in a first slot.