IAB Node Resource Allocation Using Time-Frequency HSNA Signaling
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Solution Overview
Problem
Existing IAB nodes face challenges in determining resource allocation between their MT and DU components, particularly when operating in simultaneous and non-simultaneous modes, due to insufficient information on time and frequency domain resource availability, leading to ambiguity and potential interference.
Innovation Solution
The method involves receiving and utilizing first and second slot format information, along with time and frequency domain H/S/NA information to determine operation resources for the MT and DU, ensuring clear resource allocation based on simultaneous or non-simultaneous operation, and utilizing existing DCI format 2_5 for frequency domain availability information without introducing new formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency domain H/S/NA information is provided for simultaneous operation, then resource allocation precision is improved, but device complexity increases
Solution Approach 1:
The resource allocation information is segmented into two distinct domains: time domain H/S/NA information and frequency domain H/S/NA information. The time domain information indicates availability of time resources (slots/symbols), while the frequency domain information indicates availability of frequency resources (RBs). This segmentation allows the IAB node to precisely determine operational resources by combining both dimensions, resolving the contradiction between allocation precision and complexity by organizing information in a structured, modular manner.
2Loss of information
If both time domain and frequency domain H/S/NA information are provided, then resource allocation clarity is improved, but information processing complexity increases
Solution Approach 1:
The patent extends resource allocation information from a single time domain dimension to a two-dimensional space by introducing frequency domain H/S/NA information. The time domain information covers temporal availability (which slots/symbols are available), while the frequency domain information covers spectral availability (which resource blocks are available). This dimensional expansion provides complete resource allocation clarity without excessive complexity by leveraging the natural two-dimensional structure of time-frequency resources in wireless communication.
3Loss of information
If new DCI format is introduced for frequency domain availability information, then information completeness is improved, but system compatibility deteriorates
Solution Approach 1:
The existing DCI format 2_5, originally designed for time domain availability information, is extended to serve dual purposes by incorporating both time domain H/S/NA information and frequency domain H/S/NA information. This multi-functional use of the existing DCI format allows complete resource allocation information to be transmitted without introducing new message formats, thereby maintaining backward compatibility with legacy terminals while providing enhanced functionality for simultaneous operation support.
Data Source
AI summary
Provided are a method and device for operating an IAB node including an MT and a DU in a wireless communication system. The method involves receiving first slot format information, time domain HSNA information, and frequency domain HSNA information about the DU, receiving second slot format information about the MT, and determining operation resources of the MT and the DU on the basis of at least one of the first slot format information, the time domain HSNA information, the frequency domain HSNA information, and the second slot format information. Whether to apply the frequency domain HSNA information may be determined according to whether a slot supports the simultaneous operation of the MT and the DU. In addition, provided are a method and device for notifying availability information about soft resources in a time domain and availability information about soft resources in a frequency domain by using an existing DCI format.