Multi-Transport Block Uplink Feedback for Clear Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing effective feedback mechanisms for multi-transport block (TB) uplink shared channel transmissions, particularly in scenarios where multiple codewords and TBs are used, leading to ambiguity and uncertainty between user equipment (UE) and network entities regarding successful decoding of transmissions.
Innovation Solution
The implementation of improved signaling designs and feedback mechanisms that support multi-TB uplink shared channel transmissions, including the use of feedback process identifiers, downlink feedback information (DFI) formats, and uplink control information (UCI) formats that include new data indicators (NDI) and redundancy version (RV) fields for each TB, enabling accurate feedback and synchronization between UE and network entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TBs are used for uplink shared channel transmission, then system capacity and data throughput are improved, but feedback mechanism complexity and ambiguity increase
Solution Approach 1:
The feedback mechanism is segmented by introducing separate feedback process identifiers for each TB. The DFI is divided into multiple bits, where each bit corresponds to feedback for a specific TB, allowing independent acknowledgment of each transport block while maintaining overall system capacity benefits
Solution Approach 2:
The feedback mechanism transitions from a single-dimensional approach to a multi-dimensional structure by adding TB-specific dimensions. Each TB is assigned its own feedback process ID and corresponding DFI bits, creating a structured matrix of feedback information that resolves ambiguity while preserving high throughput capabilities
2Measurement precision
If feedback process identifiers are introduced for each TB, then feedback accuracy is improved, but signaling overhead increases
Solution Approach 1:
The DFI structure is designed to serve multiple functions simultaneously: it provides individual feedback for each TB through dedicated bits, maintains feedback process tracking through identifiers, and enables efficient resource allocation. This multi-functionality achieves high feedback accuracy without proportionally increasing signaling overhead
Solution Approach 2:
The feedback mechanism utilizes parameter optimization by adjusting the number of DFI bits and feedback process IDs based on the actual number of TBs being transmitted. This dynamic parameter adjustment ensures accurate feedback for each TB while minimizing unnecessary signaling overhead when fewer TBs are active
3Measurement precision
If DFI format is designed to support multiple TBs, then decoding detection accuracy is improved, but processing complexity increases
Solution Approach 1:
Feedback process identifiers serve as intermediaries between the multiple TBs and the single DFI feedback channel. These identifiers mediate the mapping relationship, allowing the network entity to accurately determine which TB each DFI bit refers to without requiring complex processing at the UE side
Solution Approach 2:
The feedback process identifiers and DFI bit mappings are pre-configured and established before the actual feedback transmission occurs. This preliminary setup enables the UE to efficiently process the DFI by simply comparing received bits against pre-known mappings, significantly reducing real-time processing complexity while maintaining high detection accuracy
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some aspects, a user equipment (UE) and a network entity may support feedback-related signaling designs that support a feedback mechanism for uplink data transmissions that use or include multiple transport blocks (TBs). The UE may transmit a data message including multiple TBs and a feedback process identifier (ID) corresponding to the data message may be associated with the multiple TBs. If the data message is a configured grant (CG) physical uplink shared channel (PUSCH) transmission, the UE may multiplex uplink control information (UCI) with the data message that indicates feedback-related information for each of the multiple TBs. The network entity may attempt to decode the data message including the multiple TBs and may generate downlink feedback information (DFI) based on whether the network entity successfully decodes one or more of the multiple TBs.