Wireless Channel State Information Reporting for Cross-Link Interference
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Solution Overview
Problem
There is a need for a method to effectively report channel state information in wireless communication systems, particularly for seamless service provision and efficient operation of dormant cells in 5G communication systems, especially in IoT environments.
Innovation Solution
A method and apparatus for reporting channel state information involves user equipment (UE) and base stations exchanging configuration information for channel measurement resources and uplink interference measurement resources to measure signal-to-interference-plus-noise ratio (SINR) based on downlink and uplink reference signals, enabling accurate reporting of cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment measures and reports channel state information including cross-link interference measurements, then the base station can optimize resource allocation and manage channel conditions, but the user equipment requires additional processing capability and measurement resources
Solution Approach 1:
The patent segments the channel state information reporting into multiple components: downlink channel quality measurements, uplink channel quality measurements, and cross-link interference measurements. Each component is measured and reported separately using specific reference signals (CSI-RS for downlink, SRS for uplink, and CLI-RS for cross-link interference), allowing the base station to process different measurement types independently while reducing the processing burden on user equipment.
Solution Approach 2:
The patent introduces configuration information from the base station as an intermediary that guides the user equipment's measurement process. The base station provides configuration parameters including resource allocations for reference signals, measurement filters, and reporting formats. This intermediary configuration layer simplifies the user equipment's task by providing pre-defined measurement parameters rather than requiring the device to autonomously determine all measurement parameters.
2Measurement precision
If multiple reference signals are used for measuring downlink and uplink channel qualities, then measurement precision improves, but the quantity of signal processing and interference increases
Solution Approach 1:
The patent makes reference signals multi-functional by designing them to serve multiple purposes. For example, the same CSI-RS resources are used for both downlink channel quality measurement and cross-link interference measurement depending on the configuration. Similarly, SRS resources serve both uplink channel quality assessment and interference measurement functions. This universality reduces the total quantity of reference signals needed while maintaining measurement precision across multiple dimensions.
Solution Approach 2:
The patent employs parameter changes by allowing the base station to dynamically configure reference signal parameters such as frequency offsets, time offsets, and resource allocations based on current network conditions. The configuration information includes parameters that adjust the density and distribution of reference signals, enabling the system to optimize between measurement precision and signaling overhead by changing parameters rather than increasing the absolute quantity of reference signals.
Data Source
AI summary
A method of reporting channel state information by first user equipment (UE) includes receiving, from a base station, channel measurement resource (CMR) configuration information, receiving, from at least one second UE, uplink interference measurement resource (UL IMR) configuration information for measurement of cross link interference (CLI) between the at least one second UE and the first UE, measuring one or more signal to interference pulse noise ratio (SINR) based on at least one downlink reference signal (DL RS) received on CMR identified from the CMR configuration information and at least one uplink reference signal (UL RS) received on UL IMR identified from the UL IMR configuration information; and transmitting, to the base station, information about the measured one or more SINR.