UE Cross-Link Interference Measurement for Asynchronous TDD
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Solution Overview
Problem
Conventional wireless communication systems lack a mechanism to effectively configure, perform, and report cross-link interference (CLI) measurements, leading to uplink-to-downlink and downlink-to-uplink interference, particularly in dense deployment scenarios where asynchronous cell deployments result in asymmetric traffic loads and synchronization challenges.
Innovation Solution
The described techniques enable user equipment (UE) measurement of CLI by coordinating measurement resource configurations between base stations, allowing UEs to perform CLI signal strength measurements and report them back to the base stations, which can then use this information to mitigate interference. This involves sharing and combining measurement resources, transmitting measurement configuration signals, and performing measurements during intra-frequency measurement gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time division duplexing is used to mitigate asymmetry in traffic loads, then interference between cells is reduced, but synchronization between cells becomes required which may not be possible in asynchronous deployments
Solution Approach 1:
The patent implements CLI measurement and reporting mechanisms where UEs measure cross-link interference levels and feed this information back to base stations. This feedback enables the network to dynamically adjust TDD configurations and scheduling decisions to mitigate interference without requiring strict synchronization between asynchronous cells.
Solution Approach 2:
The patent introduces dynamic TDD configuration adjustments based on measured CLI levels. Base stations can dynamically switch between uplink and downlink configurations in response to interference conditions, allowing the system to adapt to asynchronous deployments while maintaining interference mitigation.
2Object-affected harmful factors
If conventional wireless communication systems are used, then system simplicity is maintained, but CLI measurement and reporting mechanisms are lacking leading to unmitigated interference
Solution Approach 1:
The patent reuses existing UE measurement capabilities and base station processing functions for CLI measurement and reporting. The same hardware and software infrastructure used for other wireless measurements is leveraged to perform CLI measurements, avoiding the need for dedicated complex measurement systems while still achieving comprehensive interference monitoring.
3Productivity
If base stations coordinate measurement resource configurations, then measurement efficiency is improved, but coordination complexity between base stations increases
Solution Approach 1:
The patent implements preliminary configuration of measurement resources where base stations pre-configure measurement parameters, resources, and reporting settings before actual CLI measurements are performed. This advance setup enables efficient coordinated measurements without requiring complex real-time coordination, as the measurement framework is established in advance through standard signaling procedures.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive from a base station a measurement configuration signal comprising a measurement resource configuration associated with a cross-link interference signal strength measurement. The UE may perform the cross-link interference signal strength measurement for one or more UEs associated with one or more intra-frequency neighboring cells according to the measurement resource configuration, wherein the cross-link interference signal strength measurement is performed during an intra-frequency measurement gap. The UE may transmit a report of the cross-link interference signal strength measurement to the base station.