IAB Relay Node PCI Collision Avoidance
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Solution Overview
Problem
In cellular communication systems, the movement of Integrated Access and Backhaul (IAB) nodes can lead to PCI Collision, causing non-optimal cell selection and handover failures due to the reuse of Physical Cell Identifiers (PCIs) across different IAB nodes, resulting in inefficient communication and potential service interruptions.
Innovation Solution
A communication control method is implemented where a first communication node inquiries about available cell IDs from a relay node, determines non-colliding cell IDs, and transmits these IDs to the relay node to execute movement processing, thereby reducing PCI Collision by managing cell ID configurations and handovers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay nodes reuse Physical Cell Identifiers (PCIs) across different locations to improve resource utilization, then device complexity and resource efficiency are improved, but PCI Collision occurs causing non-optimal cell selection and handover failures
Solution Approach 1:
The system performs preliminary PCI collision detection and resolution before handover execution. The source donor node queries available cell IDs from the target donor node, determines non-colliding cell IDs in advance, and configures the relay node with the determined cell ID before movement, preventing PCI collision during handover
Solution Approach 2:
The system implements feedback mechanisms where the source donor node inquires about available cell IDs to the target donor node, receives information about cell IDs that do not collide with existing ones, and uses this feedback to select appropriate cell IDs for the moving relay node, ensuring collision-free handover
2Reliability
If the system implements comprehensive cell ID management to prevent PCI Collision, then handover reliability is improved, but communication control complexity increases
Solution Approach 1:
The donor nodes act as intermediaries between the moving relay node and the core network. The source donor node queries the target donor node about available cell IDs, and the target donor node provides information about non-colliding cell IDs. This intermediary mechanism simplifies the overall system by centralizing PCI management at the donor node level rather than requiring complex distributed coordination
Solution Approach 2:
The system changes the cell ID parameter of the relay node before handover to ensure it does not collide with cell IDs at the target location. By dynamically selecting and assigning non-colliding cell IDs from the available pool, the system prevents PCI collision while maintaining manageable complexity through automated parameter selection
3Adaptability or versatility
If relay nodes move frequently to optimize network coverage, then network adaptability is improved, but PCI Collision probability increases causing service interruptions
Solution Approach 1:
The system performs cell ID determination and configuration before the relay node movement and handover execution. By pre-determining non-colliding cell IDs and configuring the relay node in advance, the system ensures that the handover can proceed without PCI collision-related service interruptions
Solution Approach 2:
The system assigns different cell IDs to relay nodes based on their specific target locations and local cell ID availability. Each relay node receives a locally optimized cell ID that does not collide with cell IDs in its specific target area, enabling frequent movements without PCI collision while maintaining service continuity
Data Source
AI summary
The communication control method includes making, by a first communication node including a relay node under the first communication node, an inquiry about cell IDs available in the relay node to a second communication node. The communication control method includes, in response to the inquiry, by the second communication node, determining a cell ID not colliding with the cell ID available in the second communication node from among the cell IDs available in the relay node, and transmitting the determined cell ID to the first communication node. The communication control method includes transmitting, by the first communication node, the determined cell ID to the relay node. The communication control method includes executing, by the relay node, movement processing by using the determined cell ID.