SSB Muting Patterns for Half-Duplex IAB Node Measurement
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Solution Overview
Problem
The half-duplex constraint in IAB network nodes prevents simultaneous transmission and reception of synchronization signal blocks (SSBs), leading to challenges in efficient inter-node measurement and resource management, particularly in coordinating SSB transmission and measurement timing configurations.
Innovation Solution
A coordinated method is proposed to determine a muting pattern for SSB transmission, involving the IAB donor-CU and IAB node-DU, refining an initial pattern based on neighbor relations, muting events, and node capabilities, with signaling between nodes to optimize SSB transmission and measurement configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IAB network nodes transmit and measure SSBs simultaneously, then inter-node measurement efficiency is improved, but the half-duplex constraint violation causes transmission conflicts and measurement inaccuracies
Solution Approach 1:
The network node determines a muting pattern in advance that identifies which SSB transmission opportunities should be muted to avoid conflicts with measurement occasions. This preliminary determination of muting patterns allows the node to proactively prevent transmission-measurement conflicts before they occur, ensuring measurement accuracy while maintaining efficient inter-node measurements
Solution Approach 2:
The muting pattern is dynamically determined based on the specific measurement requirements and transmission configurations of neighboring IAB nodes. The network node adapts the muting pattern according to the measured SSB periodicity, SMTC configurations, and STC parameters, allowing flexible adjustment of transmission opportunities to resolve conflicts while optimizing measurement efficiency
2Measurement precision
If IAB network nodes mute SSB transmissions to enable measurements, then measurement accuracy is improved, but transmission opportunities are lost and resource efficiency deteriorates
Solution Approach 1:
Instead of uniformly muting all SSB transmissions, the network node applies muting selectively only to specific transmission opportunities that would conflict with measurement occasions. The muting pattern identifies particular SSB instances to be muted while preserving other transmission opportunities, thereby maintaining measurement accuracy without unnecessarily sacrificing transmission efficiency
Solution Approach 2:
The network node adjusts transmission parameters such as SSB periodicity, SMTC window timing, and STC configurations to optimize the balance between measurement accuracy and transmission efficiency. By changing these parameters, the system can align transmission opportunities with measurement requirements while minimizing the impact of muting on overall transmission productivity
3Loss of information
If IAB network nodes coordinate muting patterns through signaling, then network uncertainty is reduced and resource efficiency is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The network node uses feedback mechanisms where measurement results and muting pattern determinations are exchanged between IAB nodes through signaling. This feedback loop allows nodes to adjust their muting patterns based on actual measurement outcomes and network conditions, reducing uncertainty while maintaining manageable system complexity through iterative optimization
Solution Approach 2:
Each IAB node autonomously determines its own muting pattern based on locally available information about measurement requirements and transmission configurations. The node self-configures its muting behavior without requiring complex centralized coordination, thereby reducing network uncertainty while minimizing the signaling overhead and system complexity associated with inter-node coordination
Data Source
AI summary
Methods and apparatuses are disclosed for determining a muting pattern of a synchronization signal block (SSB) transmission for Integrated Access and Backhaul (IAB) node measurement. In one embodiment, a network node is configured to indicate a first muting pattern, the indication of the first muting pattern indicating at least one first synchronization signal block, SSB, transmission opportunity associated with SSB transmission configuration, STC, that is mutable by an Integrated Access Backhaul, IAB, node. In one embodiment, a network node is configured to determine a first muting pattern, the first muting pattern indicating at least one SSB transmission opportunity associated with a STC that is mutable by the network node; and mute the at least one first SSB transmission opportunity according to the determined first muting pattern.