Multi-TB Uplink Shared Channel Feedback for Clear Retransmission
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Solution Overview
Problem
Existing wireless communication systems face ambiguity and uncertainty in feedback mechanisms for multi-transport block (TB) uplink shared channel transmissions, particularly in scenarios involving multiple codewords or TBs, leading to inefficiencies in decoding success and necessitating unclear retransmission strategies.
Innovation Solution
Implementing a feedback mechanism that supports multiple TBs by using a signaling design with a feedback process identifier (ID) and uplink control information (UCI) formats, including separate feedback indicators for each TB, to enhance decoding accuracy and reduce ambiguity between user equipment (UE) and network entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback mechanism for multi-TB transmissions is implemented without separate feedback indicators for each TB, then signaling overhead is reduced, but decoding accuracy and reliability deteriorate due to ambiguity and uncertainty in feedback interpretation
Solution Approach 1:
The feedback mechanism is segmented to provide separate feedback indicators (ACK/NACK bits) for each transport block within a multi-TB transmission. This segmentation allows the network entity to provide distinct decoding status for each TB, eliminating ambiguity and improving reliability without requiring excessive signaling overhead, as the feedback is efficiently packed within the existing uplink control information structure.
Solution Approach 2:
A dedicated feedback mechanism is implemented where the network entity sends explicit ACK/NACK indicators for each TB to the UE. This feedback loop enables the UE to accurately determine which TBs were successfully decoded and which require retransmission, significantly improving decoding accuracy and reliability while maintaining efficient signaling through standardized feedback formats.
2Measurement precision
If separate feedback indicators are provided for each TB in multi-TB transmissions, then decoding accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The feedback mechanism is designed to be universal and scalable, working for both single-TB and multi-TB transmissions through a unified framework. The same feedback structure and processing logic apply regardless of the number of TBs, reducing the need for complex specialized handling and minimizing device complexity while maintaining high feedback precision through standardized procedures.
Solution Approach 2:
The feedback mechanism provides precisely the right amount of information needed for each TB without excessive processing. By providing only the necessary ACK/NACK indicators for each TB and using efficient mapping rules, the system achieves high feedback precision without requiring complex processing algorithms, thereby balancing precision with manageable device complexity.
3Productivity
If multi-TB transmissions are supported without clear feedback mechanisms, then data rates and spectral efficiency are limited, but implementation complexity and ambiguity are reduced
Solution Approach 1:
The feedback mechanism segments the decoding status of each TB into distinct indicators, enabling the UE to precisely identify which TBs require retransmission. This segmentation supports multi-TB transmissions by providing clear feedback for each block, thereby enabling higher data rates and spectral efficiency through efficient resource utilization without introducing excessive complexity through standardized segmentation rules.
Solution Approach 2:
The feedback mechanism uses parameter changes in the form of ACK/NACK bit values to convey decoding status for each TB. By changing the state of feedback indicators based on decoding outcomes, the system enables high-speed multi-TB transmissions with clear retransmission instructions, achieving high productivity while maintaining manageable complexity through simple binary parameter changes.
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.