Sidelink Transport Block Sizing for Reliable Low-Latency V2X
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing direct communication operations, particularly in improving reliability and latency of sidelink communications, such as device-to-device and vehicle-based communications, by efficiently determining the transport block size (TBS) for sidelink information transmission.
Innovation Solution
The method and apparatuses determine the transport block size (TBS) for sidelink communications based on the overhead of a second physical sidelink channel, considering factors like the number of resource elements (REs) and symbols, and the multiplexing of physical sidelink channels, to optimize the transmission of sidelink information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport block size (TBS) is increased to improve data transmission capacity, then the throughput increases, but the reliability of sidelink communications deteriorates due to higher overhead and error probability
Solution Approach 1:
The patent dynamically adjusts the transport block size (TBS) by changing key parameters including the number of resource elements (REs) allocated, modulation and coding scheme (MCS) indices, and overhead configurations. This allows the system to optimize between throughput and reliability by selecting appropriate TBS values based on current channel conditions and communication requirements
Solution Approach 2:
The TBS determination is made dynamic through adaptive selection based on real-time conditions. The system evaluates multiple factors including channel quality indicators, buffer status, and communication priorities to dynamically adjust TBS rather than using fixed sizes, enabling flexible optimization of both productivity and reliability
2Productivity
If the overhead of physical sidelink channels is reduced to improve spectral efficiency, then the resource utilization improves, but the measurement precision of channel conditions deteriorates
Solution Approach 1:
The patent applies different overhead configurations to different physical sidelink channels (PSCCH, PSSCH, PSFCH) based on their specific requirements. Control channels receive appropriate overhead for reliable detection, while data channels optimize for spectral efficiency. This localized optimization allows each channel type to maintain necessary measurement precision while improving overall spectral efficiency
Solution Approach 2:
The system dynamically adjusts overhead parameters including the number of resource blocks, symbol allocations, and reference signal densities based on traffic conditions and channel quality. This allows flexible trade-offs between spectral efficiency and measurement precision depending on current operational requirements
3Speed
If the transport block size is optimized for low latency transmission, then the transmission speed increases, but the manufacturing precision of packet sizing deteriorates
Solution Approach 1:
The patent performs preliminary TBS determination based on pre-configured parameters and historical channel conditions before actual transmission. This advance preparation allows the system to select appropriate packet sizes that balance speed and precision requirements, avoiding last-minute adjustments that could compromise sizing accuracy
Solution Approach 2:
The system dynamically adjusts packet sizing parameters including transport block size, code block segmentation, and coding rates to achieve optimal balance between transmission speed and sizing precision. Different parameter sets are selected based on whether low latency or high precision is the primary requirement
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may support direct communications with other communications devices (e.g., direct communications between multiple UEs). Direct communications may include, but are not limited to, device-to-device (D2D) communications, vehicle-based communications, which may also be referred to as vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, and the like. In an example of V2X communications, V2V communications, and the like, a UE may identify sidelink information for sidelink communications, encode the sidelink information for the sidelink communications based on a transport block size (TBS), determine the TBS for the sidelink information based on an overhead size of a second physical sidelink channel for communicating the sidelink information, and transmit the sidelink information on a physical sidelink channel.