Relay Node TDM Conflict Cancellation in IAB Networks
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Solution Overview
Problem
Integrated access and backhaul (IAB) networks face challenges in managing time division multiplexing (TDM) alignment conflicts between parent and child links, leading to potential transmission failures and inefficiencies due to overlapping hard resource scheduling.
Innovation Solution
A relay node identifies TDM alignment conflicts and transmits conflict indications to parent or child nodes, allowing for cancellation or interruption of transmissions to avoid conflicts, using messages like MT cancellation or interruption messages to reallocate resources and adjust communication procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDM alignment conflict is not managed, then transmission scheduling is simple, but transmission failures occur and system efficiency deteriorates
Solution Approach 1:
The relay node performs preliminary identification of TDM alignment conflicts between parent link and child link transmissions before actual transmission occurs. By detecting potential conflicts in advance and sending conflict indications to parent or child nodes, the system prevents transmission failures rather than reacting to them, thereby improving reliability while maintaining manageable complexity through proactive resource coordination.
2Reliability
If conflict indications are transmitted and transmissions are cancelled/interrupted, then transmission failures are prevented, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts and handles only the specific conflict information that is necessary for resolution. The conflict indication message contains targeted data about the TDM alignment conflict, and only the minimal necessary transmissions are cancelled or interrupted. This approach prevents transmission failures while minimizing signaling overhead by focusing on essential conflict resolution information rather than comprehensive re-scheduling.
3Productivity
If hard resources are allocated for both parent and child links, then resource utilization is maximized, but TDM alignment conflicts occur
Solution Approach 1:
The relay node implements a feedback mechanism by monitoring resource allocation and detecting TDM alignment conflicts between parent link and child link transmissions. When conflicts are detected, the relay node sends conflict indications back to the parent or child nodes, which then adjust their transmissions. This feedback loop enables high resource utilization through hard resource allocation while maintaining transmission reliability by dynamically resolving conflicts based on real-time conditions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for communicating, by a relay node, in a time division multiplexing (TDM) mode, with a parent node via a parent link configured between the relay node and the parent node and with a child node via a child link configured between the relay node and the child node, identifying a TDM alignment conflict between a first transmission scheduled for the parent link and a second transmission scheduled for the child link, and transmitting a conflict indication (e.g., a cancellation message or an interruption message) to the parent node or the child node.