Guard Symbol Table Generation for IAB DU MT Resource Transitions
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing resource transitions between co-located Integrated Access and Backhaul (IAB) Distributed Unit (DU) and Mobile Termination (MT) functions, particularly due to resource misalignment and overlapping transmission/receiving conflicts, which can lead to performance issues in 5G and LTE networks.
Innovation Solution
The development of methods to generate Ng tables for co-located IAB DU/MT resource transitions, utilizing signaling mechanisms to communicate multiplexing capabilities and allocate guard symbols (Ng) to prevent conflicts during resource transitions, ensuring seamless operation across different carrier frequencies and antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource transitions between co-located IAB DU and MT are managed without guard symbols, then resource utilization efficiency is improved, but transmission/receiving conflicts occur leading to reduced reliability
Solution Approach 1:
The patent applies preliminary action by pre-calculating and signaling the Ng table (guard symbol configuration) before resource transitions occur. The gNB determines appropriate guard symbol values based on cell radius and propagation delay, then signals these configurations to the IAB node in advance through RRC signaling or MAC CE, allowing the IAB node to properly configure its MT and DU functions before actual resource transitions happen, thus preventing conflicts while maintaining efficient resource usage
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the number of guard symbols (Ng) based on specific propagation conditions. The gNB calculates Ng values according to cell radius and propagation delay parameters, then signals different Ng configurations through the Ng table. This allows the system to adapt guard symbol quantities to actual channel conditions, preventing transmission/receiving conflicts in larger cells while minimizing resource overhead in smaller cells
2Reliability
If guard symbols are added to prevent transmission/receiving conflicts, then reliability is improved, but resource availability decreases due to guard symbol overhead
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of guard symbols (Ng) based on specific propagation conditions. The gNB calculates Ng values according to cell radius and propagation delay parameters, then signals different Ng configurations through the Ng table. This allows the system to adapt guard symbol quantities to actual channel conditions, preventing transmission/receiving conflicts in larger cells while minimizing resource overhead in smaller cells
Solution Approach 2:
The patent applies partial action by implementing guard symbols only when and where actually needed. Rather than adding guard symbols uniformly across all resource transitions, the system selectively applies Ng based on the specific transition type (DL to UL, UL to DL, etc.) and propagation conditions. The Ng table provides different guard symbol values for different scenarios, applying protection only where transmission/receiving conflicts are likely to occur
3Reliability
If Ng tables are generated based on maximum cell radius, then reliability across all cell sizes is improved, but resource efficiency decreases for smaller cells due to excessive guard symbols
Solution Approach 1:
The patent applies parameter changes by generating multiple Ng tables with different maximum cell radius assumptions (e.g., 10km, 20km, 30km). Each Ng table contains guard symbol configurations optimized for its specific cell size range. The gNB selects the appropriate Ng table based on the actual cell radius, allowing small cells to use configurations with fewer guard symbols while large cells use configurations with more guard symbols, thus optimizing resource efficiency for each cell size while maintaining reliability
Data Source
AI summary
To configure an IAB node for DU function and MT function resource transitions within an IAB network, the processing circuitry is to detect using allocated resources, a plurality of resource transitions in adjacent slots between transmission or reception of data on a parent backhaul link. The processing circuitry determines based on sub-carrier spacing (SCS) associated with the allocated resources, a guard symbol table with a number of desired guard symbols for each of the plurality of resource transitions. The number of desired guard symbols are for insertion during the transmission or reception of the data on the parent backhaul link to avoid overlapping of the allocated resources for the parent backhaul link and allocated resources for the DU function during the plurality of resource transitions.