IAB Interference Measurement via Reference Signal Beam Mapping
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Solution Overview
Problem
In 5G wireless communications, integrated access and backhaul (IAB) nodes experience cross-link interference, which reduces transmission capability and performance due to differing scheduling results between nodes, leading to performance loss in backhaul links.
Innovation Solution
An interference measurement method where a second functional entity of an interference-generating node sends a reference signal using one or more beams corresponding to a reference signal resource identifier of a first functional entity, allowing an interfered node to quickly and accurately perform interference measurement, thereby reducing cross-link signal transmission impact and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IAB nodes perform simultaneous receiving and sending on backhaul and access links, then system capacity and coverage are improved, but cross-link interference occurs reducing transmission performance
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure interference measurement resources and send interference measurement configuration information to the terminal device before actual interference measurement is performed. This allows the terminal device to be prepared with the necessary reference signal resources and measurement parameters in advance, enabling accurate interference measurement on the backhaul link before cross-link interference degrades transmission performance.
Solution Approach 2:
The patent replaces physical interference avoidance mechanisms with signal-based measurement and indication mechanisms. Instead of using complex scheduling algorithms or physical separation methods to avoid cross-link interference, the system uses reference signals (CSI-RS, SRS) and measurement configurations to detect and indicate interference levels, allowing the network to make informed decisions about resource allocation and interference management.
2Measurement precision
If interference measurement resources are configured for terminal device, then interference measurement capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies universality by designing interference measurement resources that can serve multiple purposes. The same reference signal resources (CSI-RS for downlink, SRS for uplink) configured for channel state information measurement are also utilized for interference measurement on the backhaul link. This multi-functional approach allows the terminal device to perform both channel quality assessment and interference measurement using the same signal infrastructure, reducing overall system complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network device acts as a mediator by pre-configuring interference measurement resources and providing indication information. Instead of requiring the terminal device to autonomously complex interference measurement configurations, the network device prepares and indicates the necessary measurement parameters, reference signal resources, and timing information, thereby simplifying the terminal device's burden while maintaining measurement precision.
3Quantity of substance
If reference signal resources are reused for interference measurement, then resource efficiency is improved, but measurement accuracy may be affected by signal contamination
Solution Approach 1:
The patent applies segmentation by separating the functional roles of reference signals through careful resource allocation. Downlink CSI-RS resources are used specifically for downlink channel measurement, while uplink SRS resources are configured for uplink interference measurement on the backhaul link. By segmenting the usage of different reference signal types and assigning them to specific measurement purposes with dedicated time-frequency resources, the system maintains measurement accuracy while efficiently utilizing available signaling resources.
Data Source
AI summary
This application provides an interference measurement method and apparatus. A second functional entity of an interference-generating node sends, by using one or more beams corresponding to a reference signal resource identifier of a first functional entity of the interference-generating node, a reference signal used for interference measurement, so that an interfered node can perform interference measurement.