IAB Node Admission Control During Handover
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Solution Overview
Problem
Current integrated access and backhaul (IAB) node technologies face challenges in efficiently managing handovers, leading to radio link failures and service interruptions during inter-base station handovers, as they struggle to cease admitting new user equipment to active radio cells promptly, resulting in resource wastage and service disruptions.
Innovation Solution
Implementing methods and apparatuses within IAB nodes to receive handover messages and triggers, allowing for conditional configuration adoption, specifically stopping the admission of new user equipment to active radio cells before handover, and ensuring seamless transitions by synchronizing with target base stations, thereby reducing resource consumption and avoiding radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IAB node continues to admit new user equipment during handover preparation, then the radio cell remains fully operational and resource utilization is maximized, but radio link failures and service interruptions occur during inter-base station handovers
Solution Approach 1:
The IAB node stops admitting new user equipment in advance before the handover is executed. When the node receives an indication that a handover is to be performed, it proactively prevents new admissions to the active radio cell, ensuring that no new connections are established that could fail during the handover process. This preliminary action eliminates radio link failures for new UEs while maintaining service for existing UEs.
2Reliability
If the IAB node stops admission of new user equipment promptly upon receiving handover indication, then radio link failures are prevented, but service interruptions occur for existing user equipment
Solution Approach 1:
The node stops admitting new user equipment in advance before handover execution, but maintains service for existing user equipment throughout the handover process. This timing differentiation ensures that new UEs cannot establish connections that would fail, while existing UEs continue to receive service without interruption until the handover is complete.
Solution Approach 2:
The admission control state of the IAB node is dynamically adjusted based on the handover phase. During the handover preparation phase, new admissions are stopped while existing services continue. After handover completion, normal admission control is restored. This dynamic state change allows the system to adapt its behavior to the current operational context.
3Adaptability or versatility
If the IAB node allows conditional configuration adoption with triggers, then network flexibility and adaptability are improved, but system complexity increases
Solution Approach 1:
The patent extracts the admission control function from the general configuration management and makes it independently controllable through specific triggers. By separating the admission control mechanism from other configuration parameters, the system can selectively activate or deactivate admission based on handover indications without affecting other configuration aspects, thereby reducing overall system complexity.
Solution Approach 2:
The IAB node uses feedback from handover indication messages to automatically adjust its admission control behavior. When the node receives a handover indication, it automatically stops new admissions, and when handover is complete, it resumes normal admission. This feedback-driven automatic control eliminates the need for complex manual configuration management while maintaining high adaptability to network conditions.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for controlling operations of an integrated access and backhaul (IAB) node are proposed. In some embodiments, an integrated access and backhaul node may receive a message indicating that a handover of the integrated access and backhaul node is to be performed; and stop admission of new user equipment to an active radio cell of the integrated access and backhaul node based on the message received.