Remote Node Scheduler for C-RAN Resource Scheduling Consistency
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Solution Overview
Problem
In C-RAN structures, the scheduling of radio resources between Distributed Units and Central Units can become inconsistent, leading to inefficiencies in resource utilization and increased processing times due to the separation of Layer-1 and Layer-2 processes.
Innovation Solution
Implementing a scheduler in the remote node that autonomously performs scheduling for designated radio resources, reducing the need for central node involvement and preventing inconsistencies by dividing radio resources into autonomously scheduled and centrally scheduled categories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the HARQ function is installed in the Distributed Unit to reduce resending process time, then the resending process time is reduced, but the scheduling consistency between Distributed Unit and Central Unit deteriorates
Solution Approach 1:
The patent segments radio resources into two categories: first radio resources for which the Distributed Unit autonomously performs scheduling, and second radio resources for which the Central Unit performs scheduling. This segmentation allows the Distributed Unit to independently manage HARQ processes for first radio resources without affecting the centralized scheduling consistency of second radio resources, thereby resolving the contradiction between reducing resending time and maintaining scheduling consistency.
2Adaptability or versatility
If the Layer-1 and Layer-2 process parts are separated in C-RAN structure, then the system flexibility and scalability are improved, but the processing time increases due to additional signal transmissions
Solution Approach 1:
The patent applies preliminary action by having the Central Unit advance-allocate first radio resources to the Distributed Unit before actual communication occurs. The Distributed Unit stores this advance allocation information and performs autonomous scheduling without needing real-time signaling during HARQ resending operations, thereby reducing processing time while maintaining the flexibility of the C-RAN architecture.
3Loss of time
If the Distributed Unit performs autonomous scheduling for all radio resources, then the processing time is reduced by eliminating Central Unit involvement, but the overall system coordination and resource optimization deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the scheduling authority based on radio resource types. For first radio resources, the Distributed Unit has autonomous scheduling authority to minimize processing time. For second radio resources, the Central Unit maintains scheduling control to ensure optimal system-wide resource allocation. This differentiated approach allows each node to operate with appropriate autonomy level, balancing local efficiency with global optimization.
Data Source
AI summary
A remote node capable of reducing the effect of an increase in a processing time that occurs when a C-RAN structure is applied and efficiently performing scheduling of radio resources is provided. A remote node 10 according to the present disclosure includes a scheduler 11 configured to perform scheduling for a first radio resource among radio resources available for radio communication, the first radio resource being a radio resource designated in advance by a center node 20, and a communication unit 12 configured to perform radio communication with a communication terminal 30 by using the first radio resource or a second radio resource among the radio resources available for radio communication, the second radio resource being a radio resource for which scheduling has been performed by the center node 20.