IAB Transmission Resource Allocation for Half-Duplex MT-DU Conflicts
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Solution Overview
Problem
The existing Integrated Access and Backhaul (IAB) technology is constrained by half-duplex operation mode, leading to conflicts between the Mobile Terminal (MT) and Distributed Unit (DU) resources, resulting in resource overlapping and transmitting and receiving conflicts.
Innovation Solution
A method and device for configuring and managing time-frequency resources to prevent resource conflicts by indicating, configuring, or not scheduling transmissions on specific time-frequency resources for next-hop nodes, using information such as high-layer signaling, MAC Control Elements, and network parameters to manage DU and MT operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the IAB node operates in half-duplex mode with MT and DU sharing the same time resources, then the device complexity is reduced, but resource conflicts and transmission reliability deteriorate
Solution Approach 1:
The patent segments time resources into distinct MT resources and DU resources with different attributes (hard, soft, NA). By dividing the time domain into multiple slots and symbols with different access types, the system avoids resource conflicts while maintaining half-duplex operation, thereby improving transmission reliability without increasing device complexity
Solution Approach 2:
The patent introduces dynamic resource allocation where the CU can configure and adjust MT and DU resources based on network conditions. The system dynamically switches between hard, soft, and NA resource configurations to adapt to varying traffic demands, ensuring reliable transmission while maintaining operational flexibility
2Loss of time
If MT and DU share the same time resources in half-duplex mode, then the loss of time is reduced, but resource overlapping and harmful factors increase
Solution Approach 1:
The patent applies local quality by assigning different attributes (hard, soft, NA) to specific time resources based on their intended use. MT resources and DU resources are differentiated with specific characteristics, allowing the system to optimize time resource utilization while preventing resource conflicts through localized resource properties
Solution Approach 2:
The CU acts as an intermediary that coordinates and manages MT and DU resource allocation. By introducing the CU as a mediator, the system can allocate time resources efficiently without conflicts, resolving the contradiction between time utilization and resource conflict prevention
3Productivity
If the DU operates freely on hard resources without considering MT configuration, then the productivity is improved, but resource conflicts occur
Solution Approach 1:
The patent implements preliminary action by having the CU pre-configure MT and DU resources before transmission occurs. The network side proactively allocates hard, soft, and NA resources to prevent conflicts before they happen, ensuring both high DU productivity and reliable resource allocation through advance planning
Data Source
AI summary
A transmission method and a transmission device are provided. The transmission method for a first node or a third node includes obtaining information of a fifth time-frequency resource, and performing at least one of the following operations on the fifth time-frequency resource: indicating or configuring whether a second node performs transmission on the fifth time-frequency resource, the second node being a next-hop node of the first node; indicating that the fifth time-frequency resource is to be used by the first node or the second node for transmission; not expecting the second node to perform the transmission on the fifth time-frequency resource; not scheduling the second node to perform the transmission on the fifth time-frequency resource; or not configuring the second node to perform the transmission on the fifth time-frequency resource.