GC-PDCCH NNK1 Feedback Holding for MBMS Resource Conflicts
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Solution Overview
Problem
Current MBMS systems face challenges in efficiently managing feedback reporting for group common-physical downlink shared channel (GC-PDSCH) transmissions due to interference and resource conflicts, particularly when using non-numerical K1 (NNK1) indications in GC-PDCCH transmission grants, leading to increased control overhead and potential transmission failures.
Innovation Solution
Implementing NNK1 indications in GC-PDCCH transmission grants for UEs to hold feedback codebooks until a report triggering event occurs, allowing UEs to determine valid K1 values for PUCCH resource transmission, thereby optimizing feedback reporting and reducing conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NNK1 indications are used in GC-PDCCH transmission grants to allow flexible feedback reporting, then adaptability is improved, but control overhead increases
Solution Approach 1:
The patent changes the parameter representation from numerical K1 values to non-numerical K1 (NNK1) indications. Instead of specifying exact timing offsets, the system uses indicator values that map to predetermined timing relationships, allowing flexible feedback reporting while reducing control message complexity and overhead.
2Adaptability or versatility
If NNK1 indications are used to manage feedback timing, then adaptability is improved, but transmission reliability deteriorates due to resource conflicts
Solution Approach 1:
The system performs preliminary configuration by establishing predetermined mappings between NNK1 indicator values and feedback timing relationships before actual transmission occurs. This pre-planned structure prevents resource conflicts by ensuring that feedback reports are scheduled in advance without overlapping, thereby maintaining high transmission reliability while preserving timing flexibility.
3Object-generated harmful factors
If feedback reporting is held until report triggering events, then resource conflicts are reduced, but loss of time increases due to delayed feedback
Solution Approach 1:
The system implements periodic feedback reporting triggered by specific events rather than continuous or fixed periodic reporting. Feedback is held until predetermined triggering events occur, such as receiving a specific downlink transmission or reaching a configured timing threshold. This event-driven approach reduces resource conflicts by synchronizing feedback reports with natural transmission boundaries while limiting delays through configured triggering conditions.
Data Source
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AI summary
This disclosure provides systems, methods, and devices for wireless communication that support control of feedback reporting associated with broadcast or multicast transmissions based on indications of non-numerical K1 (NNK1) in associated transmission grants. In aspects, a base station transmits multicast transmission grants that include NNK1s to a set of UEs. The UEs in the set of UEs generate feedback codebooks, for the multicast transmissions, and holds transmission of the codebooks, based on the NNK1 received in the transmission grants until a report triggering event occurs. In aspects, the report triggering event includes receiving a subsequent multicast transmission grant with a valid K1, receiving a subsequent unicast transmission grant with valid K1, or receiving a UE-specific multicast retransmission grant. In aspects, the UEs use the valid K1 in the triggering event to determine a feedback resource to transmit the held feedback codebooks. Other aspects and features are also claimed and described.