5G Wireless Resource Allocation for Closed-Loop Control
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Solution Overview
Problem
Current industrial wireless solutions are inadequate for real-time control applications requiring low latency and high reliability, as they lack efficient radio resource allocation techniques for deterministic bi-directional communication in closed-loop control systems, especially in 5G wireless networks.
Innovation Solution
A computing system and method for scheduling uplink and downlink wireless transmissions using a multi-user Deterministic 5G (Det-5G) framework, which determines a minimum bundle length for repeated transmissions to ensure received signal quality and allocates wireless resources to improve transmission reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless communication is used for closed-loop control, then adaptability and versatility are improved, but reliability and latency performance deteriorate
Solution Approach 1:
The transmission time is segmented into multiple short Transmission Time Intervals (TTIs) that are bundled together. Each TTI contains control information and data, with repeated transmissions across multiple TTIs to ensure reliability. This segmentation allows the system to maintain adaptability while improving reliability through multiple transmission attempts within a bundled structure.
Solution Approach 2:
The base station performs preliminary resource allocation and scheduling before actual transmission occurs. Resource allocation messages are prepared in advance, and transmission parameters are pre-configured to ensure deterministic latency requirements are met. This preliminary action enables the system to achieve both adaptability and reliability by preparing transmission parameters that guarantee performance requirements.
2Reliability
If repeated transmissions are used to improve reliability, then reliability is improved, but loss of time increases
Solution Approach 1:
Multiple repeated transmissions are merged into a single bundled transmission structure. Instead of treating each retransmission as a separate time-consuming operation, the bundle combines multiple TTIs with their repetitions into a unified transmission unit. This merging allows the base station to schedule and transmit multiple repetitions efficiently, reducing overall time loss while maintaining reliability.
Solution Approach 2:
The system uses periodic bundled transmissions where control information and data are transmitted repeatedly at regular intervals. This periodic action pattern allows for predictable timing and deterministic latency, as the base station can schedule repetitions within fixed time windows. The periodic structure optimizes the balance between reliability through repetition and time efficiency through structured scheduling.
3Productivity
If joint resource allocation is used, then productivity is improved, but device complexity increases
Solution Approach 1:
The base station implements a universal resource allocation mechanism that handles multiple users and transmission types through a single integrated scheduling framework. The joint resource allocation procedure serves multiple functions: it schedules downlink transmissions, allocates uplink resources, manages bundled repetitions, and ensures quality requirements. This multi-functionality improves productivity by consolidating management tasks while the standardized approach keeps device complexity manageable.
Data Source
AI summary
In general terms, network resource allocation takes place within a wireless communication channel in which resource is defined with respect to time and frequency; a resource allocation process involves joint allocation of resource for communication to and from group of devices, to enable a cyclic exchange of information between the devices and a base-station and thus to enable wireless closed loop control of the device. By jointly allocating resources in one go, overheads are reduced thereby providing a more efficient resource allocation mechanism. Furthermore, bundled transmissions are scheduled, including repetitions of transmissions to increase the likelihood of transmission success. By determining a minimum bundle length required to meet a predefined threshold for received signal quality, the reliability of the transmissions can be ensured.