Multi-TRP HARQ-ACK Codebook Segmentation for PUCCH Transmission
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Solution Overview
Problem
In wireless communication systems, particularly in multi-TRP operations, there is a challenge in effectively handling overlapping transmissions between Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (PUSCH) transmissions, leading to inefficiencies in resource allocation and interference management.
Innovation Solution
The technique involves determining a Transmission and Reception Point (TRP) index for Physical Downlink Shared Channel (PDSCH) transmissions, using control resource sets (CORESETs) to schedule Hybrid Automatic Repeat Request (HARQ)-ACK information, and transmitting this information on the PUCCH, with mechanisms for handling multiple TRPs and default index values when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP operations are implemented to improve wireless communication performance, then reliability and coverage are enhanced, but device complexity and interference management difficulty increase
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple codebooks, with each codebook corresponding to a specific TRP index. This segmentation allows the UE to separately manage HARQ-ACK information for different TRPs, reducing the complexity of handling multi-TRP operations while maintaining improved reliability through diversified transmission paths.
Solution Approach 2:
The patent applies local quality by associating different HARQ-ACK codebooks with different TRP indices, where each codebook has specific properties tailored to its corresponding TRP. This allows differentiated handling of HARQ-ACK information based on the local characteristics of each TRP, managing complexity while enhancing communication reliability.
2Reliability
If HARQ-ACK information is transmitted for multiple TRPs, then communication reliability improves, but transmission overhead and resource allocation complexity increase
Solution Approach 1:
The patent creates a universal mapping mechanism where a single TRP index value can serve multiple functions: it identifies the corresponding TRP, determines which HARQ-ACK codebook to use, and guides the transmission strategy. This multi-functionality reduces transmission overhead by avoiding redundant signaling while maintaining reliable HARQ-ACK transmission across multiple TRPs.
3Ease of operation
If default TRP index values are used when indices are not provided, then ease of operation improves, but measurement precision and tracking accuracy may be reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring default TRP index values that the UE can use when specific TRP indices are not provided in scheduling assignments. This preliminary setup simplifies operation by providing immediate fallback options, while the system maintains precision through subsequent updates when actual TRP indices become available, ensuring accurate TRP identification throughout the communication process.
Data Source
AI summary
Systems, devices, and techniques for wireless communications are described. A described technique includes receiving, by a user equipment (UE) from one or more Transmission and Reception Points (TRPs), a physical downlink shared channel (PDSCH) transmission; determining, by the UE for a physical uplink control channel (PUCCH) carrying hybrid automatic repeat request-acknowledgement (HARQ-ACK), a TRP index in accordance with a control resource set (CORESET) scheduling the PDSCH transmission; and transmitting, by the UE via the PUCCH, HARQ-ACK information based on the receiving of the PDSCH transmission in accordance with the TRP index.