IAB Node Timing Alignment for Cross-Link Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving timing alignment for cross-link interference in integrated access and backhaul networks, particularly in 5G networks, which are essential for enabling simultaneous operations in upstream and downstream communications by IAB nodes.
Innovation Solution
Proposed methods for timing alignment in IAB systems include configuration and signaling enhancements for both transmission (Tx) and reception (Rx) alignment at IAB nodes, allowing for simultaneous operations with a unified framework based on node capabilities and scheduling needs, extending beyond Rel-16 timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If timing alignment procedures are implemented in integrated access and backhaul networks, then cross-link interference is reduced and communication efficiency is improved, but system complexity and signaling overhead increase
Solution Approach 1:
The patent implements preliminary timing alignment procedures where IAB nodes acquire timing alignment information before engaging in simultaneous upstream and downstream operations. The node receives timing alignment commands from its parent node and applies these adjustments in advance to prevent cross-link interference, thereby improving communication efficiency without requiring complex real-time coordination mechanisms.
Solution Approach 2:
The timing alignment process is segmented into distinct phases: acquiring downlink timing information from synchronization signals, receiving timing alignment commands from the parent node, and applying timing adjustments separately for upstream and downstream operations. This segmentation simplifies the overall system complexity by breaking down the timing alignment problem into manageable, independent steps.
2Adaptability or versatility
If simultaneous upstream and downstream operations are enabled at IAB nodes, then network flexibility and communication capacity are improved, but cross-link interference increases
Solution Approach 1:
The patent applies preliminary anti-action by having IAB nodes acquire timing alignment information from their parent nodes before engaging in simultaneous upstream and downstream operations. The node receives timing alignment commands that pre-compensate for potential cross-link interference, allowing simultaneous operations to proceed without significant interference issues.
Solution Approach 2:
The system implements feedback mechanisms where parent nodes monitor timing alignment status of their child IAB nodes and send corrective timing alignment commands when necessary. This feedback loop ensures that cross-link interference is continuously managed, allowing the network to maintain high flexibility with simultaneous operations while keeping interference levels acceptable.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for timing alignment in integrated access and backhaul. A method includes receiving, at an integrated access and backhaul (“IAB”) node of a wireless communication network, a first configuration for receiving a downlink reference signal and a second configuration for receiving an uplink reference signal. The method includes determining timing alignment information associated with the downlink reference signal and the uplink reference signal. The method includes determining, based on the timing alignment information, a timing misalignment value. The method includes computing a second reception time based on a first reception time and the timing misalignment value, the first reception time determined based on the downlink reference signal. The method includes applying the second reception time to the TAB node for receiving the uplink reference signal.