IAB MT Signaling Released Resources for Backhaul
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Solution Overview
Problem
In current IAB network architectures, released resources associated with child links are not effectively signaled to parent nodes, leading to inefficiencies in resource re-use for parent backhaul links, as the parent nodes are not aware of the availability of these resources.
Innovation Solution
Implementing new signaling mechanisms from the IAB network's mobile terminal function to the parent DU function, using options such as the physical uplink control channel (PUCCH), medium access control (MAC) control elements, grant-free uplink transmissions on the physical uplink shared channel (PUSCH), or layer 1 channels, to inform parent nodes about released child link resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new signaling mechanisms are implemented from IAB MT to parent DU, then resource re-use efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the IAB MT signals released resources back to the parent DU through established control channels (PUCCH, MAC CE, PUSCH). This feedback loop enables the parent node to aware of resource availability and make optimal scheduling decisions, directly improving resource re-use efficiency without requiring fundamentally new complex infrastructure.
Solution Approach 2:
The patent leverages existing multi-functional control channels (PUCCH for control information, MAC CE for control elements, PUSCH for data and control) to serve the dual purpose of traditional communication and resource release signaling. This approach improves productivity by utilizing already-deployed infrastructure rather than adding dedicated new signaling channels.
2Productivity
If resource release signaling is implemented, then network resource management is improved, but loss of time increases
Solution Approach 1:
The patent enables preliminary notification of resource release status to the parent DU before the parent node needs to make scheduling decisions. By signaling resource availability proactively rather than reactively, the system reduces the time the parent node spends discovering resource status and accelerates the resource re-use process.
Solution Approach 2:
The patent implements periodic or event-triggered signaling mechanisms where the IAB MT notifies resource releases at appropriate intervals or when specific conditions are met. This periodic action ensures the parent node receives timely updates without requiring continuous signaling, balancing resource management efficiency with time loss minimization.
Data Source
AI summary
An apparatus of an Integrated Access and Backhaul (IAB) node includes processing circuitry coupled to a memory. To configure the IAB node for time-domain resource management within an IAB network, the processing circuitry is to detect that a time-domain resource assigned to a child communication link of the IAB node is available. An uplink message is encoded for transmission by a mobile terminal (MT) function of the IAB node to a parent IAB node. The uplink message indicates availability of the time-domain resource for a parent backhaul link between the IAB node and the parent IAB node. A downlink message from the parent IAB node is decoded. The downlink message is received via the parent backhaul link and using the time-domain resource.