Dynamic MCS Selection for URLLC Latency
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Solution Overview
Problem
Current 5G new radio (NR) technologies face challenges in adapting to the high latency and reliability requirements of Ultra-Reliable and Low Latency Communications (URLLC) services due to inflexible modulation and coding scheme (MCS) notification methods, which cannot dynamically select suitable MCS information within the low latency needed for URLLC services.
Innovation Solution
A communication method that allows terminal devices to dynamically determine and notify modulation and coding scheme information based on received DCI or HARQ response information within a specific time window, enabling flexible adaptation to URLLC service requirements without relying on semi-static higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device notifies the terminal device of the MCS table by using higher layer signaling in a semi-static manner, then the terminal device can obtain MCS information, but the network device cannot flexibly select an MCS table or corresponding MCS information for the terminal device, which does not adapt to the high latency requirement of URLLC service
Solution Approach 1:
The patent transforms the semi-static MCS notification mechanism into a dynamic one by introducing multiple MCS tables with different block error rates and enabling the network device to dynamically indicate which MCS table to use through DCI. This allows the system to adapt MCS selection in real-time according to channel conditions and service requirements, resolving the contradiction between adaptability and notification time.
Solution Approach 2:
The patent changes the parameter of MCS table selection by introducing multiple MCS tables with different BLER values (e.g., BLER 0.1 and BLER 0.01) and using DCI to dynamically indicate which table to use. This parameter change enables flexible adaptation to different service requirements without relying on semi-static higher layer signaling, thus reducing latency while maintaining adaptability.
2Reliability
If the network device uses a single MCS table with BLER 0.1 for eMBB service, then the system maintains simplicity, but it cannot support the lower block error rate requirement of URLLC service
Solution Approach 1:
The patent segments the single MCS table into multiple MCS tables with different block error rate characteristics. Each MCS table is optimized for specific service requirements (eMBB with BLER 0.1, URLLC with BLER 0.01), allowing the system to select the appropriate table based on service type. This segmentation resolves the contradiction by providing both high reliability options and maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent creates a universal MCS table structure that can serve multiple service types (eMBB and URLLC) with different reliability requirements. By defining multiple MCS tables within the same system framework and using DCI to select the appropriate one, the system achieves multi-functionality where a single set of MCS tables can satisfy both eMBB and URLLC requirements, resolving the contradiction between reliability and complexity.
Data Source
AI summary
A communication method and a communications device are provided. The communication method includes: determining a modulation and coding scheme index; determining first information based on received DCI; determining, based on the first information, modulation and coding scheme information corresponding to the modulation and coding scheme index, wherein the first information comprises a search space in which the DCI is located, and the search space in which the DCI is located is a common search space or a user-specific search space.