Inter-UE CLI Sensing and Signaling for Full-Duplex Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively mitigating cross-link interference (CLI) between user equipment (UEs) due to concurrent downlink and uplink transmissions, which degrade signal quality and reliability in full-duplex communications.
Innovation Solution
UEs transmit capability messages to network entities indicating their ability to measure and report CLI characteristics, allowing the network to select schemes for estimating CLI channels, such as unprecoded or precoded sounding reference signals (SRS), and adjust channel parameters based on feedback and assistance information to mitigate CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented between UEs, then communication efficiency and throughput are improved, but cross-link interference degrades signal quality and reliability
Solution Approach 1:
The patent applies preliminary action by having UEs transmit capability messages and measurement results before actual full-duplex communication occurs. The network entity uses these pre-reported CLI characteristics to configure appropriate SRS resources and parameters in advance, allowing the system to proactively mitigate interference rather than reactively correcting it during communication.
Solution Approach 2:
The patent implements feedback mechanisms where UEs measure and report CLI channel characteristics (such as RSRP, RSRQ, SINR) back to the network entity. This feedback loop enables the network to dynamically adjust SRS configuration, precoding, and resource allocation to optimize full-duplex communication while mitigating cross-link interference.
2Reliability
If CLI measurement and reporting schemes are implemented, then CLI mitigation capability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies local quality by enabling UEs to report CLI characteristics only for specific neighboring UEs and specific measurement scenarios. Instead of universal reporting, the capability messages and measurement reports are tailored to local interference conditions, allowing the network to selectively configure SRS resources only where CLI mitigation is actually needed, thereby reducing overall signaling overhead.
Solution Approach 2:
The patent uses parameter changes by allowing the network entity to dynamically adjust SRS configuration parameters (such as periodicity, bandwidth, power, and precoding) based on reported CLI characteristics. The system can switch between different measurement schemes (e.g., Type 1 and Type 2 measurements) and adjust reporting frequencies depending on the severity and variability of CLI conditions.
Data Source
AI summary
Methods, systems, and devices for inter-UE cross link interference (CLI) characteristics are described. A UE may transmit, to a network entity, capability information indicating a capability of the UE to support one or more schemes for determining characteristics of an inter-UE CLI channel. The network entity may transmit, based on the capability information, an indication of a selected scheme of the one or more schemes for determining the characteristics of the channel. The UE may perform a set of measurements of the characteristics and may transmit assistance information in accordance with the selected scheme. The assistance information may pertain to the channel and may include the set of multiple measurements. The UE may also transmit an indication of the channel's variation or an indication of a coherence time. The network entity may transmit one or more updated channel parameters in response to receiving the assistance information.