Dynamic Transport Block Size Selection for 5G Uplink
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Solution Overview
Problem
In 5G URLLC services, the mismatch between allocated network resources and actual data size leads to inefficient resource utilization, resulting in increased energy consumption and reduced air interface resource efficiency due to the need for padding bits during data transmission.
Innovation Solution
A data transmission method that allows terminals to determine the appropriate transport block size based on received uplink grant messages, which include modulation and coding scheme information, enabling flexible uplink transmission and reducing the need for padding bits by optimizing data block sizes and repetition quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device allocates a relatively large resource, then the data transmission reliability is improved, but the air interface resource utilization is reduced and energy consumption increases due to padding bits
Solution Approach 1:
The patent implements dynamic transport block size selection by allowing the terminal to determine the appropriate transport block size from multiple candidate sizes based on the actual data size. This dynamic adjustment mechanism enables the system to adapt the resource allocation to match the actual data transmission needs, thereby improving air interface resource utilization while maintaining data transmission reliability.
Solution Approach 2:
The patent changes the parameter of transport block size from a fixed large allocation to a dynamically selectable size from multiple candidates. By adjusting this parameter based on actual data size, the system eliminates the need for excessive padding bits, thus improving resource utilization without compromising transmission reliability.
2Reliability
If the network device allocates a relatively large resource, then the data transmission reliability is improved, but the energy consumption increases due to padding bits
Solution Approach 1:
The terminal dynamically selects the transport block size from multiple candidate sizes based on the actual data size, ensuring that the allocated resources closely match the actual transmission needs. This dynamic adaptation reduces the number of padding bits that need to be transmitted, thereby reducing uplink sending duration and energy consumption while maintaining reliable data transmission.
Solution Approach 2:
By changing the transport block size parameter to be dynamically adjustable rather than fixed, the system optimizes the match between allocated resources and actual data size. This parameter optimization reduces unnecessary padding bit transmission, directly lowering energy consumption while preserving transmission reliability.
3Adaptability or versatility
If the network device cannot learn of a size of to-be-sent data of a terminal in advance, then the scheduling flexibility is maintained, but the resource allocation accuracy deteriorates leading to mismatch between allocated and actual data size
Solution Approach 1:
The patent segments the transport block size into multiple candidate sizes (e.g., different transport block size indices). The terminal determines the actual data size and selects the appropriate candidate size that best matches the actual data. This segmentation approach maintains scheduling flexibility while significantly improving resource allocation accuracy by providing granular size options.
Solution Approach 2:
The system implements dynamic transport block size determination where the terminal selects from multiple candidate sizes based on actual data size. This dynamic selection process maintains the flexibility of not knowing the exact data size in advance while achieving high allocation accuracy through adaptive choice among predefined options.
Data Source
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AI summary
This application provides a data transmission method and apparatus. The method includes: receiving an uplink grant message from a network device, where the uplink grant message includes first information, and the first information corresponds to a plurality of transport block sizes; determining the plurality of transport block sizes based on the first information; determining, based on a size of to-be-sent data, a first transport block size from the plurality of transport block sizes; and sending the to-be-sent data to the network device based on the first transport block size. The data transmission method in embodiments of this application helps improve air interface resource utilization and data transmission reliability.