Dual Connectivity Reference Cell Selection for IAB Timing Conflict Resolution
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Solution Overview
Problem
Current dual connectivity solutions for integrated access and backhaul in 5G networks face challenges in conflict resolution, particularly with timing misalignment and interference constraints, which affect simultaneous operation of child and parent links, and do not adequately address IAB-specific issues like availability indication for soft resources.
Innovation Solution
The proposed methods introduce additional steps and rules for determining a reference cell and handling conflicts by dropping or overriding attributes, considering availability indications and beam/power/interference constraints, and extending priority rules to intra-band dual connectivity scenarios to improve conflict resolution and resource multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual connectivity is implemented in IAB networks, then deployment flexibility and spectrum utilization are improved, but timing misalignment and interference conflicts between child and parent links worsen
Solution Approach 1:
The patent introduces a reference cell determination mechanism that acts as an intermediary to resolve timing conflicts between multiple cells. By selecting one cell as the reference and using its timing alignment as the basis for conflict resolution, the system mediates the timing misalignment issues that arise in dual connectivity scenarios, allowing flexible deployment while maintaining reliable timing synchronization.
Solution Approach 2:
The patent dynamically changes the timing alignment parameters based on which cell is determined to be the reference cell. When timing conflicts occur, the system adjusts the timing parameters of non-reference cells to align with the reference cell, thereby resolving timing misalignment while preserving the adaptability benefits of dual connectivity.
2Productivity
If simultaneous operation of child and parent links is enabled, then network capacity and resource utilization are improved, but interference constraints and conflicts worsen
Solution Approach 1:
The patent implements dynamic resource allocation and conflict resolution mechanisms that adapt to changing interference conditions. By continuously determining reference cells and adjusting resource allocation based on current timing alignment and interference levels, the system enables simultaneous child and parent link operations while dynamically managing interference to maintain high network capacity.
Solution Approach 2:
The patent performs preliminary reference cell determination and timing alignment configuration before simultaneous operations begin. This preliminary action establishes the timing relationships and resource allocation patterns needed to enable high-capacity simultaneous operations while pre-configuring the system to handle interference constraints effectively.
3Reliability
If reference cell determination and conflict resolution rules are implemented, then timing alignment and interference management are improved, but system complexity increases
Solution Approach 1:
The patent applies conflict resolution rules locally at each IAB node based on its specific reference cell determination, rather than implementing a complex centralized control mechanism. Each node independently determines its reference cell and applies timing alignment adjustments locally, which improves timing reliability while avoiding the complexity of centralized coordination across the entire network.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for dual connectivity enhancements in integrated access and backhaul. An apparatus (1300) includes a transceiver (1325) that receives a first attribute associated with a first symbol on a first cell, receives a second attribute associated with a second symbol on a second cell, and receives first information of a first timing alignment 5 for the first cell and second information of a second timing alignment for the second cell. The apparatus (1300) includes a processor (1305) that determines which of the first cell and the second cell is a reference cell based on the first and second information and, in response to determining that the first cell is the reference cell, neglects a second operation associated with the second symbol, and in response to determining that the second cell is the reference cell, neglects a first 0 operation associated with the first symbol.