GC-PDCCH Grants for MBMS Feedback Codebook Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face a feedback codebook misalignment issue due to the use of multiple feedback timing indicators (K1s) in group common-physical downlink control channel (GC-PDCCH) transmission grants, leading to varying sizes of feedback codebooks reported by different user equipment (UEs) in the physical uplink control channel (PUCCH) occasion.
Innovation Solution
The proposed solution involves transmitting GC-PDCCH transmission grants that include a common K1 and multiple PUCCH resource indicators (PRIs) to ensure that UEs report feedback codebooks of the same size, either by configuring scheduling restrictions or using relative K1s to determine feedback resources, allowing for synchronized feedback reporting across UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feedback timing indicators (K1s) are used in GC-PDCCH transmission grants to allow flexible feedback timing for different UEs, then adaptability of feedback scheduling is improved, but feedback codebook size alignment deteriorates causing misalignment issues
Solution Approach 1:
The patent segments the feedback timing indication into two parts: a common K1 value that applies to all UEs for codebook size alignment, and UE-specific PUCCH resource indicators (PRIs) that provide individualized feedback resources. This segmentation allows the system to maintain both codebook alignment and scheduling flexibility simultaneously.
Solution Approach 2:
The patent applies local quality by making the K1 parameter uniform (common quality) across all UEs to ensure codebook alignment, while allowing the PUCCH resource indicators to be locally customized for each UE. This enables different parts of the feedback mechanism to have different properties: common K1 for alignment, UE-specific PRIs for flexibility.
2Ease of operation
If multiple PUCCH resource indicators (PRIs) are configured for different UEs to enable individualized feedback resources, then ease of operation is improved, but control overhead increases
Solution Approach 1:
The patent makes the common K1 parameter universal across all UEs, serving multiple functions: it provides feedback timing information to all UEs simultaneously and ensures codebook size alignment. This universality reduces the need for separate K1 indications for each UE, thereby reducing control overhead while maintaining individualized resource allocation through PRIs.
3Adaptability or versatility
If feedback codebooks of varying sizes are reported by different UEs, then adaptability to different UE conditions is improved, but reliability of feedback processing deteriorates due to misalignment
Solution Approach 1:
The patent creates equipotentiality in the feedback codebook size across all UEs by using a common K1 value. This ensures that all UEs generate feedback codebooks of the same size, making them comparable and reliably processable. Meanwhile, UE-specific PRIs allow individualized resource allocation to maintain adaptability to different UE conditions.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for enabling a wireless system implementing multicast transmissions to control feedback reports from multiple user equipments (UEs) and to address feedback codebook misalignment issues. In particular, aspects provide for multicast transmission grants including multiple feedback timing indicators (K1) in which the multicast transmission grants are configured to configure different UEs for multicast transmission feedback reporting in which feedback codebooks transmitted in various uplink control transmission occasions from the different UEs have a same size. Other aspects and features are also claimed and described.