IAB Node Access via Reserved Resources for 5G Backhaul
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Solution Overview
Problem
In the context of 5G wireless backhaul scenarios, there is a need for an efficient method for Integrated Access and Backhaul (IAB) nodes to access each other, particularly to ensure rapid selection of new nodes in case of link failures, given the denser deployment of wireless backhaul nodes at higher frequency bands.
Innovation Solution
The proposed solution involves an access method where IAB nodes send and receive access request and indication messages based on reserved access resources, allowing or prohibiting access, with the second IAB node being a donor, parent, or child node of the first IAB node, ensuring bidirectional configuration and quick access to appropriate IAB nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless backhaul nodes are densely deployed at higher frequency bands to achieve better multi-path transmission, then transmission quality and coverage are improved, but transmission distance becomes shorter and node density requirements increase
Solution Approach 1:
The patent segments the backhaul transmission into multiple hops through relay nodes. Instead of requiring long direct transmission distances, the system divides the transmission path into shorter segments (e.g., gNB to IAB node, then IAB node to UE), where each segment operates at higher frequencies for better quality while the overall coverage is maintained through multiple relay points
Solution Approach 2:
The patent introduces IAB (Integrated Access and Backhaul) nodes as intermediary elements between the gNB and UEs. These relay nodes receive signals from the gNB and forward them to UEs, enabling high-frequency signals with short transmission distances to achieve wide coverage through multi-hop transmission, thus resolving the contradiction between transmission quality and transmission distance
2Ease of operation
If IAB nodes use random access channels for access, then access capability is provided, but access conflicts and failures occur due to lack of reserved resources
Solution Approach 1:
The patent implements preliminary action by reserving specific random access resources (preambles, time-frequency slots) for IAB nodes in advance through RRC signaling or system information broadcasting. This pre-configuration ensures that when IAB nodes need to access the network, they can immediately use their reserved resources without contention, eliminating access conflicts and ensuring high access success rates
Solution Approach 2:
The patent applies local quality by assigning different reserved random access resources to different IAB nodes or groups of IAB nodes. Each IAB node is configured with specific preambles and time-frequency resources tailored to its location and service requirements, enabling differentiated access strategies that optimize both ease of operation and access reliability for local scenarios
3Stability of the object's composition
If IAB nodes need to quickly select new parent nodes during link failures, then network stability is improved, but access resource management becomes more complex
Solution Approach 1:
The patent prepares multiple candidate parent nodes and their associated reserved access resources in advance for each IAB node. When a link failure occurs, the IAB node can immediately switch to a pre-configured candidate using its reserved resources, avoiding the complexity of real-time resource allocation and negotiation during failure recovery, thus maintaining network stability while managing complexity through pre-planning
Data Source
AI summary
This disclosure provides an access method and a device. The method includes: sending an access request message to a second IAB node; and receiving an indication message sent by the second IAB node, where the indication message indicates that the second IAB node allows or prohibits access by the first IAB node, the indication message is determined by the second IAB node based on a reserved access resource and the access request message, and the second IAB node is a donor IAB node or a parent IAB node or a child IAB node of the first IAB node.