MAC PDU Assembly With Pre-Grant Processing for Low-Latency 5G
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency and efficiently managing data transmission in 5G networks, particularly in scenarios requiring low latency and flexible grant sizes.
Innovation Solution
Implementing a wireless transmit/receive unit (WTRU) that determines network transmission parameters and signaling prior to a transmission grant, allowing for incremental data block creation and encoding, segmentation, assembly, and multiplexing based on data block sizes, and providing flexible grant sizes for early generation of transport blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If data transmission follows traditional grant-based scheduling in 4G LTE, then system complexity is reduced and ease of operation is maintained, but transmission latency increases and productivity decreases
Solution Approach 1:
The patent implements preliminary action by allowing the WTRU to determine network transmission parameters and prepare data blocks before receiving a transmission grant. The WTRU performs blind decoding of DCI formats, determines decoding parameters, and prepares transport blocks in advance, enabling faster transmission once the grant is received, thus reducing overall latency without requiring complex real-time processing
2Adaptability or versatility
If the system uses fixed grant sizes for data transmission, then device complexity is reduced and ease of operation is improved, but adaptability to different data block sizes deteriorates and productivity is limited
Solution Approach 1:
The patent applies dynamics by enabling flexible grant sizes that can be dynamically adjusted based on the amount of data available for transmission. The network can grant different transport block sizes adaptively, and the WTRU can segment or assemble data blocks accordingly, allowing the system to optimize transmission efficiency for varying data loads without requiring overly complex processing mechanisms
Solution Approach 2:
The patent implements parameter changes by allowing variation in grant size parameters based on data block sizes. The system can change the transport block size parameter dynamically, enabling the WTRU to adjust its transmission parameters to match the available data, thus improving adaptability while maintaining manageable processing complexity through standardized procedures
3Productivity
If the WTRU waits for a transmission grant before preparing data blocks, then device complexity is reduced and ease of operation is maintained, but loss of time increases and productivity decreases
Solution Approach 1:
The patent implements preliminary action by enabling the WTRU to perform data block segmentation, assembly, and encoding preparation before receiving the transmission grant. The WTRU can determine decoding parameters through blind decoding and prepare transport blocks in advance, so that when the grant arrives, transmission can begin immediately with minimal processing delay, significantly improving productivity
Solution Approach 2:
The patent applies skipping by allowing the WTRU to skip the waiting period traditionally required between grant reception and data preparation. By performing processing operations in parallel or in advance where possible, the system rushes through the preparation phase, reducing the overall transmission time and improving efficiency without proportionally increasing complexity
4Adaptability or versatility
If the system uses blind decoding for DCI reception, then adaptability to different scheduling scenarios is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The patent applies partial action by implementing a tiered blind decoding approach where the WTRU first attempts to decode DCI using a limited set of likely parameters, and only performs additional decoding attempts if the initial attempt fails. This partial execution of the full blind decoding process reduces average decoding time while maintaining the adaptability to identify correct decoding parameters across different scheduling scenarios
Data Source
AI summary
Systems, methods, and instrumentalities (e.g. aspects of entities, interfaces and procedures in a wireless transmit/receive unit (WTRU) and/or network layers L1, L2, l3) are disclosed for low latency medium access control (MAC) protocol data unit (PDU) assembly in wireless systems, such as 5G flexible radio access technology (RAT) (5gFLEX). Latency may be reduced, for example, by WTRU determination of network transmission parameters and signaling prior to a transmission grant. A WTRU may receive a modulation and coding scheme (MCS), resource range, etc. prior to a grant, e.g., for use in future grants. Data blocks may be incrementally created/encoded prior to a grant. Data units may be segmented, assembled and multiplexed, for example, based on data block sizes that allow MAC and radio link control (RLC) processing prior to a grant. Flexible grant sizes may be provided for early generation of transport blocks before a grant. A minimum guaranteed transport block size (TBS) may be signaled to permit early generation of a MAC PDU. Transmission parameters may be selected prior to a grant, for example, using blind decoding or a DCI reception procedure.