Time-Space Two-Dimensional Channel Coding for 5G uRLLC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G systems face challenges in balancing latency, reliability, and transmission rate, particularly in the uRLLC scenario where low latency and high reliability are contradictory requirements, and new applications like digital twin and XR require ultra-low latency, high reliability, and large bandwidth.
Innovation Solution
A time-space two-dimensional coding method is introduced, which combines time-domain and space-domain coding to form two-dimensional coded blocks. This method allows for different coding structures, rates, and modulation modes in both domains, enabling flexible adjustment to meet the requirements of various scenarios and facilitating smooth transition between eMBB and uRLLC scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coded-block length is increased to improve reliability, then reliability is improved, but latency increases
Solution Approach 1:
The patent introduces space-domain coding as an additional dimension alongside traditional time-domain coding. By encoding data across multiple spatial layers (antennas) in addition to time symbols, the system achieves higher reliability without proportionally increasing the time-domain block length, thus resolving the contradiction between reliability and latency
Solution Approach 2:
The patent segments the coded blocks into multiple spatial layers for parallel transmission. Instead of transmitting a single long time-domain block, the data is divided and transmitted across multiple spatial dimensions simultaneously, reducing the effective time required while maintaining or improving reliability through spatial diversity
2Loss of time
If the coded-block length is decreased to reduce latency, then latency is reduced, but reliability deteriorates
Solution Approach 1:
By adding the space dimension to traditional time-domain coding, the patent enables short time-domain blocks to achieve high reliability through spatial redundancy and diversity. The space-domain encoding provides additional error protection without requiring longer time blocks, thus achieving low latency with high reliability
3Reliability
If the coding rate is reduced to improve reliability, then reliability is improved, but transmission rate decreases
Solution Approach 1:
The patent compensates for the transmission rate loss from reduced coding rates by utilizing the space dimension. Multiple spatial layers transmit data in parallel, effectively multiplying the throughput. This allows the system to use more robust (lower rate) coding schemes while maintaining high overall transmission rates through spatial multiplexing
4Loss of time
If the block length is further shortened for 6G requirements, then latency is reduced, but the ability to satisfy reliability requirements deteriorates
Solution Approach 1:
The patent is specifically designed for 6G ultra-short block lengths by leveraging space-domain coding. With block lengths as short as 64 symbols, traditional time-domain coding cannot provide sufficient reliability, but the addition of space-domain encoding across multiple antennas provides the necessary error protection, enabling 0.1ms latency with 99.9999% reliability
Solution Approach 2:
The patent segments ultra-short coded blocks into multiple spatial layers, allowing each layer to carry a portion of the data with distributed error protection. This segmentation across space enables the system to tolerate the extremely short block lengths required for 6G while maintaining reliability through spatial diversity and redundancy
Data Source
AI summary
In a method for coding on a time-space two-dimensional channels, the system expresses the coding method with code words, merges the code words to form a space-time two-dimensional codebook, stores the codebook at both ends of the sending terminal and the receiving terminal; the sending terminal selects the coding structure according to the code words, and encodes each data stream according to time-domain coding rates, and forms data blocks of an equal length in the time-domain through the rate matching. The system selects different code word serial numbers, rate matching tables and space time slicing modes according to the requirements of different scenarios for transmission rates, latency and code error rate, as well as channel states and size of data blocks; when a Time Space Concatenated Coding Mode is adopted, the sending terminal performs time-domain coding according to the time-domain slicing mode and the time-domain code words.