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To fully support vertical industries, 5G and its corresponding channel codingare expected to meet requirements of different applications. However, forapplications of 5G and beyond 5G (B5G) such as URLLC, the transmission latencyis required to be much shorter than that in eMBB. Therefore, the resultingchannel code length reduces drastically. In this case, the traditional 1-Dchannel coding suffers a lot from the performance degradation and fails todeliver strong reliability with very low latency. To remove this bottleneck,new channel coding scheme beyond the existing 1-D one is in urgent need. Bymaking full use of the spacial freedom of massive MIMO systems, this paperdevotes itself in proposing a spatiotemporal 2-D channel coding for very lowlatency reliable transmission. For a very short time-domain code length$N^{\text{time}}=16$, $64 \times 128$ MIMO system employing the proposedspatiotemporal 2-D coding scheme successfully shows more than $3$\,dBperformance gain at $\text{FER}=10^{-3}$, compared to the 1-D time-domainchannel coding. It is noted that the proposed coding scheme is suitable fordifferent channel codes and enjoys high flexibility to adapt to differencescenarios. By appropriately selecting the code rate, code length, and thenumber of codewords in the time and space domains, the proposed coding schemecan achieve a good trade-off between the transmission latency and reliability.

Spatiotemporal 2-D Channel Coding for Very Low Latency Reliable MIMO Transmission