Transport Block Size Calculation for 5G URLLC Short Transmissions
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in determining optimal transport block sizes for physical shared channels, particularly in ultra-reliable low-latency communication (URLLC) scenarios, where transmissions can be too short and result in orphan symbols or zero transport block sizes, leading to inefficiencies and dropped communications.
Innovation Solution
The proposed solution involves modifying the transport block size calculation formula to accommodate smaller transmissions by adjusting the overhead parameters, ensuring a positive number of Resource Elements (REs) are configured, and implementing alternative formulas to handle cases where the traditional formula results in negative or zero REs, thereby preventing dropped transmissions and improving resource allocation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional transport block size calculation formula is used, then resource allocation follows standard procedures, but short transmissions result in negative or zero Resource Elements leading to dropped communications
Solution Approach 1:
The patent changes the overhead parameter values dynamically based on transmission length. For short transmissions (e.g., 2-3 symbols), it uses reduced overhead parameters (e.g., 0 or 6 resource elements per PRB) instead of standard overhead values, ensuring that the calculated Resource Elements remain positive and transmissions are not dropped.
2Reliability
If overhead parameters are reduced for short transmissions, then positive Resource Elements are ensured, but standard overhead configuration cannot be applied
Solution Approach 1:
The patent introduces dynamic parameter selection where the overhead configuration changes based on the transmission duration. The system dynamically chooses between different overhead parameter sets (e.g., first set for short transmissions, second set for standard transmissions) based on the number of symbols allocated, making the parameter configuration adaptive rather than static.
Solution Approach 2:
The patent segments the parameter space by dividing overhead configurations into distinct sets based on transmission length thresholds. It creates separate parameter configurations (first set with reduced overhead, second set with standard overhead) and selects appropriate segments based on the transmission duration, allowing specialized handling for short transmissions without affecting standard operations.
3Reliability
If alternative formulas are used for short transmissions, then dropped transmissions are prevented, but calculation complexity increases
Solution Approach 1:
The patent implements dynamic formula selection where the calculation method changes based on transmission duration. For short transmissions below a threshold, it uses an alternative formula with reduced overhead parameters. For standard transmissions, it uses the traditional formula. This dynamic approach prevents dropped transmissions while managing calculation complexity through conditional logic.
4Reliability
If transport block size is increased for URLLC, then reliability improves, but latency increases due to larger data blocks
Solution Approach 1:
The patent changes the overhead parameter values specifically for short transmissions to ensure positive Resource Elements. By using reduced overhead parameters (e.g., 0 or 6 resource elements per PRB instead of standard values like 18), it maintains efficient resource utilization for short URLLC packets without unnecessarily increasing transport block size, thus avoiding increased latency while improving reliability.
Data Source
AI summary
A network device (e.g., a user equipment (UE), a new radio NB (gNB), or other network component) can process or generate a physical shared channel based on a number of resource blocks determined by one or more formulas for a transport block size (TBS). In response to determining a result of the one or more formulas based on one or more received parameters a configured action for the physical shared channel can be determined based on the number of resource elements (REs). A radio frequency (RF) interface, is configured to provide, to RF circuitry, data for transmitting a new radio (NR) communication based on the configured action.