Physical Resource Block Reduction for Low Code Rate Transmission
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Solution Overview
Problem
Existing data transmission methods in radio communications systems cannot implement code rates lower than 0.1, limiting the maximum coverage capability, especially in scenarios with low base station power, wide coverage areas, or severe interference.
Innovation Solution
A data transmission method where a base station obtains a second number of physical resource blocks from a first number, sends indication information to a user equipment to indicate an encoded bit repetition multiple, and the user equipment duplicates encoded bits according to this multiple, allowing for code rates lower than 0.1 by reducing the number of physical resource blocks used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of physical resource blocks is reduced to enable code rates lower than 0.1, then the maximum coverage capability is improved, but the transmission efficiency deteriorates
Solution Approach 1:
The encoded bits are segmented into multiple groups, where each group is transmitted on a separate physical resource block. By dividing the original encoded bit sequence into N groups (where N is the code rate multiplier), the system can achieve lower effective code rates while maintaining transmission structure integrity. This segmentation allows the receiver to combine multiple transmissions to recover the original data, improving coverage without completely sacrificing efficiency.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by mapping encoded bits to different frequency resources (physical resource blocks) rather than simply repeating in time. By utilizing the frequency domain dimension and allocating different groups of encoded bits to different PRBs, the system achieves diversity gain and lower effective code rates while maintaining better spectral efficiency compared to traditional time-domain repetition.
2Reliability
If redundancy is added to the transmitted signal to increase the signal-to-noise ratio at the receive end, then the maximum coverage capability is improved, but the data transmission rate deteriorates
Solution Approach 1:
Different groups of encoded bits are allocated to different physical resource blocks with potentially different channel conditions. The system applies local quality optimization by adapting the allocation strategy to local channel characteristics, ensuring that critical data groups are transmitted on more reliable resources while less critical groups use available resources, thereby improving overall SNR without uniformly reducing the transmission rate across all data.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method and system, a base station, and a user equipment. The method includes: obtaining, by a base station, a second number of PRBs according to a first number of PRBs, where the second number of PRBs is smaller than the first number of PRBs, and the first number of PRBs is exactly divisible by the second number of PRBs; sending, by the base station, indication information to a UE, where the indication information is used to indicate the second number of PRBs or an encoded bit repetition multiple, and the encoded bit repetition multiple is equal to the first number of PRBs divided by the second number of PRBs; and obtaining, by the UE, the encoded bit repetition multiple according to the indication information, and performing data transmission according to the encoded bit repetition multiple. In the technical solution in the embodiments of the present invention, data transmission is performed according to the encoded bit repetition multiple, thereby further reducing a code rate, implementing data transmission at a code rate lower than 0.1, and further enhancing a maximum coverage capability of a radio communications system.