Multi-Slot PDSCH Transport Blocks for High-Delay Coverage
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Solution Overview
Problem
Wireless communication systems with large propagation delays, such as 5G and non-terrestrial networks, face challenges with high propagation loss, weak diffraction capability, and limited coverage, necessitating coverage enhancement technologies for improved downlink and uplink transmissions.
Innovation Solution
Implementing techniques for user equipment (UE) to receive physical downlink shared channel (PDSCH) transmissions of a transport block (TB) over multiple slots, utilizing a configuration for PDSCH transmission across a first number of slots, determining a transport block size, and decoding the transmission over a second number of slots based on available resources and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDSCH transmission is extended over multiple slots, then coverage and reliability are improved in high propagation delay environments, but transmission latency and processing complexity increase
Solution Approach 1:
The transport block is segmented and transmitted across multiple slots, allowing the receiver to accumulate signal energy over time. This segmentation enables improved coverage by distributing the transmission over multiple time resources while maintaining the ability to decode the complete data block only after receiving all segments.
Solution Approach 2:
The system performs preliminary configuration of TBoMS parameters including number of slots, resource allocations, and modulation schemes before actual transmission. This preliminary setup optimizes the transmission parameters in advance, reducing real-time processing latency while maintaining reliable multi-slot transmission.
2Reliability
If PDSCH transmission is extended over multiple slots, then coverage and reliability are improved in high propagation delay environments, but device complexity and processing requirements increase
Solution Approach 1:
The system dynamically adapts the number of slots and resource allocations based on channel conditions, propagation delay measurements, and traffic requirements. This dynamic configuration allows the system to optimize between reliability and complexity by adjusting TBoMS parameters in real-time rather than using fixed complex multi-slot schemes.
Solution Approach 2:
The patent changes key transmission parameters including modulation and coding scheme (MCS), number of slots, and resource block allocations to optimize TBoMS performance. By systematically varying these parameters based on channel conditions, the system achieves improved reliability without requiring overly complex processing, as the parameter changes follow standardized patterns.
3Productivity
If transport block size is increased for multi-slot transmission, then data throughput is improved, but error probability and decoding difficulty increase
Solution Approach 1:
The system transmits the transport block partially across multiple slots rather than completing the transmission in a single slot. This partial transmission approach allows the data to be accumulated over time, improving decoding reliability through time diversity while maintaining reasonable throughput by not requiring excessive redundancy in any single transmission instance.
Data Source
AI summary
Mechanisms are provided for a user equipment (UE) to receive physical downlink shared channel (PDSCH) transmissions of a transport block (TB) over multiple slots. The UE can receive a configuration for a PDSCH transmission of a TB over multiple slots (TBoMS), such as a first number of slots, through a downlink from a base station. The configuration can include an indication of the first number of slots. The UE can further determine a transport block size (TBS) for the PDSCH transmission, and allocate a second number of slots used by the UE to support the PDSCH transmission. Based on the TBS for the PDSCH transmission satisfying a condition, the processor can be configured to receive the PDSCH transmission of the TB over the second number of slots, and decode the PDSCH transmission received.