HARQ-ACK Report Generation for Unicast and Multicast PDSCH
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in HARQ-ACK reporting for unicast and multicast PDSCHs, particularly in concatenating HARQ-ACK codebooks without increasing signaling overhead, which complicates the configuration of the HARQ-ACK report structure.
Innovation Solution
The method involves generating a single HARQ-ACK report by concatenating first and second HARQ-ACK codebooks based on specific rules, prioritizing the first HARQ-ACK codebook for unicast PDSCHs and arranging second HARQ-ACK codebooks for multicast PDSCHs based on G-RNTIs, allowing for efficient reporting without increasing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK codebooks for unicast and multicast PDSCHs are concatenated to generate a single report, then reporting efficiency is improved, but the complexity of configuring the report structure increases
Solution Approach 1:
The HARQ-ACK codebook is segmented into two distinct parts: a first HARQ-ACK codebook for unicast PDSCHs and a second HARQ-ACK codebook for multicast PDSCHs. This segmentation allows independent configuration and processing of each codebook type, reducing the overall configuration complexity while enabling efficient concatenation for unified reporting.
Solution Approach 2:
The first HARQ-ACK codebook and second HARQ-ACK codebook are concatenated to form a single HARQ-ACK report. This merging approach consolidates feedback information from both unicast and multicast PDSCHs into one report, improving reporting efficiency and reducing the number of separate signaling procedures required.
2Reliability
If the first HARQ-ACK codebook is prioritized in the concatenation, then unicast PDSCH feedback is ensured, but the signaling overhead may increase
Solution Approach 1:
Different prioritization rules are applied to different codebooks based on their specific requirements. The first HARQ-ACK codebook for unicast PDSCHs is prioritized to ensure reliable feedback for critical unicast communications. The second HARQ-ACK codebook for multicast PDSCHs follows a different arrangement based on G-RNTI values. This localized quality approach ensures each codebook receives appropriate handling without unnecessarily increasing overall signaling overhead.
3Ease of operation
If multiple HARQ-ACK codebooks are arranged based on G-RNTIs, then multicast PDSCH organization is improved, but the processing complexity increases
Solution Approach 1:
The arrangement of the second HARQ-ACK codebook is based on changing the parameter of G-RNTI values. By organizing codebooks according to these identifier values, the system achieves systematic organization of multicast PDSCH feedback while using a straightforward sorting mechanism that does not significantly increase processing complexity.
Data Source
AI summary
According to an embodiment of the present disclosure, a user equipment (UE) may receive information regarding a plurality of radio network temporary identifiers (RNTIs); monitor a plurality of physical downlink control channels (PDCCHs) in search space sets based on the plurality of RNTIs; receive a plurality of physical downlink shared channels (PDSCHs) scheduled by the plurality of PDSCHs; and transmit a single hybrid automatic repeat request (HARQ)-acknowledgment (ACK) report for the plurality of PDSCHs, wherein the plurality of PDSCH may include at least one unicast PDSCH in addition to the multicast PDSCHs.