Multi-Slot Single TB Transmission for NR Scheduling
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Solution Overview
Problem
Current New Radio (NR) systems face challenges in efficiently transmitting a single transport block over multiple time slots due to long processing delays, especially at high subcarrier spacings, which can lead to stalled transmissions and hardware implementation constraints.
Innovation Solution
The implementation of an extended scheduling solution that allows a single transport block to be transmitted over multiple physical uplink or downlink shared channels, each occupying at least one slot, with support for start and length indicators to extend beyond the traditional 14-symbol limit, enabling the transmission to span multiple slots and accommodate longer DMRS patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single transport block is transmitted over multiple slots, then processing delays are reduced and transmission efficiency is improved, but the complexity of scheduling and resource management increases
Solution Approach 1:
The transmission of a single transport block is segmented across multiple slots, with each slot carrying a portion of the coded bits. This segmentation allows the system to overcome processing delay constraints while maintaining efficient resource utilization through divided transmission segments.
Solution Approach 2:
The scheduling mechanism dynamically adapts to high subcarrier spacing conditions by enabling flexible multi-slot transport block transmission. The system can switch between single-slot and multi-slot transmission modes based on processing delay requirements, providing dynamic optimization of transmission efficiency.
2Loss of time
If the transmission duration is extended beyond 14 symbols, then high subcarrier spacing processing delays are addressed, but the hardware implementation constraints are violated
Solution Approach 1:
The solution transitions from a single-slot time dimension to a multi-slot time dimension, allowing transport blocks to span multiple slots. This dimensional extension in time allows the system to accommodate high subcarrier spacing processing delays while maintaining compliance with hardware constraints through proper segmentation.
3Reliability
If multiple PXSCHs are used for a single transport block, then transmission reliability is improved, but the system complexity increases
Solution Approach 1:
Multiple PXSCH transmissions are merged to form a single transport block delivery system. By combining multiple transmission instances across different slots, the system achieves improved reliability through redundancy and diversity while managing complexity through unified transport block handling.
Data Source
AI summary
Methods, systems and apparatuses are disclosed for configuring a network node that communicates with a wireless device (WD) to use at least one of a single physical uplink shared channel or physical downlink shared channel (PXSCH) for a single transport block (TB) transmission that exceeds a single slot. The network node and WD may be further configured to transmit a single TB over multiple PXSCHs with one PXSCH for each slot. Initial transmission of one or more code blocks (CBs) or code block groups (CBG) of a TB may be indicated by the network node of WD with a start length indicator (SLIV). CBs transmitted in one or more PXSCHs may be grouped into one or more CBG groups by the network node or WD and repetition, multi-PUSCH scheduling and single TB transmission over multiple PUSCHs may also be used.