Multi-Level Scheduling for URLLC Communication Reliability
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Solution Overview
Problem
Current wireless communication systems for factory automation face challenges in achieving ultra-reliable and low-latency communication, particularly in ensuring a block error rate of 10−9 or less and end-to-end latency of 1 ms or less, while efficiently utilizing radio resources.
Innovation Solution
The method involves multi-level scheduling, combining orthogonal and non-orthogonal transmission, and channel state information (CSI) feedback to optimize resource allocation and transmission parameters, allowing terminals to perform decoding with partial packet reception and reducing overhead through targeted resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wireless communication methods are used for factory automation, then device complexity is reduced, but reliability cannot achieve 10^-9 block error rate and latency cannot meet 1 ms requirement
Solution Approach 1:
The patent segments the communication system into multiple transmission points and implements multi-level scheduling with different time granularities. Level 1 scheduling operates on a longer timescale for resource allocation, while level 2 scheduling operates on a shorter timescale for packet transmission. This segmentation allows the system to achieve URLLC reliability requirements through coordinated multi-point transmission without requiring complete system redesign.
Solution Approach 2:
The patent performs preliminary channel state information (CSI) feedback transmission before actual data transmission. The terminal measures channel conditions and feeds back CSI to the base station in advance, enabling the base station to pre-determine optimal transmission parameters. This preliminary action ensures that when URLLC packets are transmitted, the system is already configured for optimal reliability performance.
2Loss of time
If traditional wireless communication methods are used for factory automation, then device complexity is reduced, but end-to-end latency cannot achieve 1 ms or less
Solution Approach 1:
The patent divides the scheduling process into two hierarchical levels with different time scales. Level 1 scheduling performs resource allocation over a longer period, while level 2 scheduling handles packet transmission over a shorter period. This time-scale segmentation allows the system to maintain resource allocation flexibility while achieving low-latency packet transmission required for URLLC.
Solution Approach 2:
The patent performs preliminary resource allocation and channel measurement before actual URLLC packet transmission. The base station pre-configures transmission parameters based on historical channel conditions and QoS requirements, so that when packets need to be transmitted with 1 ms latency, the system can immediately use pre-determined optimal parameters without additional processing delay.
3Reliability
If full packet transmission is used to ensure reliability, then reliability improves, but resource consumption increases
Solution Approach 1:
The patent implements early termination of packet transmission when the terminal successfully decodes the packet. Instead of transmitting the complete scheduled packet, the base station stops transmission once the QoS requirement is met. This partial action approach maintains reliability by ensuring successful reception while reducing radio resource consumption by avoiding unnecessary transmissions of remaining packet portions.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal monitors received packets and signals the base station when decoding is successful. This feedback enables the base station to terminate transmission early, optimizing the balance between reliability and resource efficiency. The feedback loop ensures that transmission continues only as long as necessary to meet QoS requirements.
4Productivity
If multi-level scheduling is implemented to optimize resource allocation, then resource utilization efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the scheduling function into two distinct levels operating at different time scales. Level 1 scheduling handles long-term resource allocation with broader scope, while level 2 scheduling handles short-term packet transmission with finer granularity. This segmentation allows each level to operate independently with optimized complexity, avoiding the need for a single complex scheduling system while achieving high resource utilization efficiency.
Data Source
AI summary
An operation method of a terminal may comprise receiving, from a base station, information of target transmission points targeted for a report of first channel state information (CSI) among the plurality of transmission points; receiving a first CSI-reference signal (CSI-RS) from the target transmission points; transmitting the first CSI determined based on the first CSI-RS to the base station; receiving, from the base station, information on a first transmission point determined based on the first CSI; receiving, from the first transmission point indicated by the information on the first transmission point, a second CSI-RS; receiving, from the base station, information on a requirement; and transmitting, to the base station, a second CSI including a transmission parameter for achieving the requirement.