Transport Block Multiplexing for Low-Latency URLLC Demodulation
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Solution Overview
Problem
The existing TB-based multiplexed-modulated repetition transmission scheme in ultra-reliable low-latency communication (URLLC) introduces transmission latency due to the need for the access network device to wait for the completion of both TBs before initiating multiplexed modulation, which affects demodulation reliability and increases signal-to-noise ratio requirements.
Innovation Solution
A method that involves sending a third TB when a preset condition is met, combining bit data from multiple devices, and using feedback mechanisms and bandwidth part configurations to improve demodulation reliability and reduce latency, including diverse implementations for feedback and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access network device waits for transmission of both TBs to end before starting multiplexed modulation, then demodulation reliability is improved, but transmission latency increases
Solution Approach 1:
The access network device performs multiplexed modulation on the first TB before the transmission of the second TB ends. By advancing the multiplexed modulation operation to occur preliminarily during the transmission period of the second TB, the device eliminates the waiting time that would otherwise be required, thus reducing transmission latency while maintaining demodulation reliability through the use of the second TB as a reference signal.
2Reliability
If TB-based multiplexed-modulated repetition transmission is used, then demodulation reliability is improved, but signal-to-noise ratio requirements increase
Solution Approach 1:
The second TB serves as an intermediary reference signal that enables the first device to demodulate the third TB without requiring high signal-to-noise ratio conditions. By using the second TB (which was successfully decoded) as a reference, the system reduces the SNR requirement for correct decoding of the combined transport block.
Data Source
AI summary
A communication method and a related apparatus are provided. The method includes: sending at least two transport blocks TBs, where the at least two TBs include a first TB and a second TB, the first TB is a TB corresponding to a first device, the second TB is a TB corresponding to a second device, the first device and the second device belong to a same device group, the first TB includes at least one first modulation symbol, the first modulation symbol is obtained by modulating a first bit group based on a first modulation scheme, the second TB includes at least one second modulation symbol, and the second modulation symbol is obtained by modulating a second bit group based on a second modulation scheme.