IAB Node Radio Link Failure Notification in Wireless Relay Networks
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Solution Overview
Problem
In wireless relay networks, existing systems face challenges in managing radio link failures and congestion, particularly in 5G networks, where relay nodes may experience performance issues due to weak signals, leading to reduced data rates and link failures, and there is a need for efficient methods to handle resource congestion and notify nodes of essential information changes.
Innovation Solution
An integrated access and backhaul (IAB) node with processor circuitry and transmitter circuitry that detects radio link failures, generates system information indicating cell status, and transmits notification messages to wireless terminals to initiate system information acquisition procedures, allowing for cell selection and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay nodes are deployed to expand coverage area, then coverage area and signal quality are improved, but network complexity and resource management difficulty increase
Solution Approach 1:
The network is segmented into donor nodes and relay nodes with hierarchical management. Each relay node independently manages its own cell status and broadcasts system information, reducing the complexity burden on the overall network while expanding coverage through distributed deployment.
Solution Approach 2:
Relay nodes perform preliminary detection of radio link failures and proactively broadcast system information changes before they affect user communications. This advance notification mechanism prevents service degradation and simplifies real-time management by addressing issues before they escalate.
2Loss of information
If system information is broadcasted frequently to notify nodes of changes, then information timeliness is improved, but signaling overhead and network traffic increase
Solution Approach 1:
System information changes are broadcasted locally at each relay node independently based on its own detected radio link failure status. Each relay node determines its own cell status (barred/not barred) and broadcasts accordingly, rather than requiring centralized coordination, thus reducing overall signaling overhead while maintaining information timeliness.
Solution Approach 2:
Relay nodes perform periodic detection of radio link failures and broadcast system information changes at scheduled intervals or when status changes occur. This periodic mechanism ensures timely information dissemination while avoiding excessive broadcasting during stable conditions, balancing timeliness with overhead reduction.
3Reliability
If relay nodes perform continuous monitoring of radio link status, then network reliability is improved, but energy consumption and processing load increase
Solution Approach 1:
Relay nodes perform periodic monitoring of radio link status rather than continuous monitoring. The detection is triggered at specific intervals or when threshold conditions are met, ensuring reliable failure detection while reducing energy consumption and processing load compared to continuous monitoring approaches.
Solution Approach 2:
Relay nodes are pre-configured with detection thresholds and monitoring parameters. When radio link quality approaches critical levels, the nodes proactively initiate detection and broadcasting procedures, maintaining high reliability by catching issues early while avoiding the constant energy expenditure of continuous active monitoring.
Data Source
AI summary
An integrated access and backhaul (IAB) parent node comprises a first radio interface and a radio second interface. The first radio interface is configured to establish a radio resource control (RRC) connection with a donor node; the second radio interface is configured to serve a cell to communicate with a wireless terminal. The wireless terminal may be a user equipment (UE) or a child IAB node. The IAB parent node comprises processor circuitry and transmitter circuitry. The processor circuitry is configured to: detect a radio link failure (RLF) on an upstream path to the donor node, provide updated system information based on the RLF, the updated system information comprising at least one cell status indicating that the cell is not allowed to camp on; and, generate a notification message comprising notification information configured to indicate whether the wireless terminal is to initiate an acquisition procedure to acquire the system information (a) immediately, or (b) after a next modification period boundary. The transmitter circuitry is configured to transmit, using the second interface, to the wireless terminal: the notification message and the updated system information.