Orthogonal DMRS Mapping for IAB Node MT and DU Operations
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Solution Overview
Problem
Current wireless communication technologies face challenges in providing enhanced mobile broadband, massive Machine Type Communications, and Ultra-Reliable and Low Latency Communications, particularly in managing integrated access and backhaul links efficiently, especially in next-generation radio access networks.
Innovation Solution
The implementation of a method where demodulation reference signals (DMRS) are applied differently for parent and distributed unit operations, with DMRS ports belonging to distinct code division multiplexing groups, allowing for orthogonal transmission and accurate channel estimation in integrated access backhaul networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DMRS ports for MT and DU operations use the same CDM group, then resource utilization is simplified, but channel estimation accuracy deteriorates due to signal interference
Solution Approach 1:
The patent segments DMRS ports into different CDM groups (first CDM group for MT operation, second CDM group for DU operation) to eliminate interference between simultaneous transmissions. This segmentation allows independent channel estimation for each operation type without mutual interference, resolving the contradiction between simplified configuration and accurate estimation.
Solution Approach 2:
The patent applies different CDM group assignments locally to different operational modes (MT vs DU). By assigning DMRS ports from different CDM groups to different operations, each operation receives optimized reference signal resources tailored to its specific requirements, thereby maintaining high channel estimation accuracy while managing complexity.
2Measurement precision
If DMRS ports for MT and DU operations use different CDM groups, then channel estimation accuracy improves through orthogonal transmission, but resource allocation complexity increases
Solution Approach 1:
The patent divides the DMRS port space into distinct CDM groups, with the first CDM group dedicated to MT operation and the second CDM group dedicated to DU operation. This segmentation enables orthogonal transmission that eliminates interference, achieving high channel estimation accuracy while maintaining manageable configuration complexity through systematic port assignment rules.
3Productivity
If integrated access and backhaul links operate simultaneously, then network efficiency improves, but signal interference increases affecting communication reliability
Solution Approach 1:
The patent segments the radio resources by assigning different CDM groups to different operational modes (MT for access link, DU for backhaul link). This allows simultaneous operation of integrated access and backhaul links without mutual interference, thereby improving network efficiency while maintaining communication reliability through orthogonal reference signal transmission.
Solution Approach 2:
The patent uses CDM groups as an intermediary mechanism to separate and manage simultaneous MT and DU operations. By introducing CDM group differentiation as an intermediary layer, the system enables concurrent access and backhaul operations while preventing signal interference, thus achieving both high productivity and reliability.
Data Source
AI summary
The present specification provides a method by which an integrated access and backhaul (IAB) node performs a mobile terminal (MT) operation and a distributed unit (DU) operation in a wireless communication system, the method performing initial access operations with a parent node and a child node, respectively, an MT operation with the parent node, and a DU operation with the child node, wherein a first demodulation reference signal (DMRS) is applied to the MT operation, a second DMRS is applied to the DU operation, and DMRS ports belonging to different code division multiplexing (CDM) groups are applied to the first DMRS and the second DMRS, respectively.