Base Station Uplink Timing for Cross-Link Interference Mitigation
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Solution Overview
Problem
In 5G wireless communication systems, particularly in the mmWave band, cross-link interference between user equipment (UE) devices poses challenges for downlink receiving performance due to unsynchronized timing and interference from adjacent UE devices, which affects data transmission rates and propagation range.
Innovation Solution
The proposed method involves a base station and user equipment (UE) collaboration to detect and mitigate cross-link interference by exchanging capability information, uplink timing information, and cross-link interference measurement reports, allowing the UE to adjust its communication to minimize interference and enhance downlink reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented in 5G systems, then data transmission rate is improved, but cross-link interference from adjacent UEs deteriorates downlink receiving performance
Solution Approach 1:
The base station performs preliminary actions by determining uplink timing information of interfering UEs before the reference UE experiences severe interference, and provides this information to the reference UE in advance. The reference UE then uses this timing information to measure CLI and report back, enabling the base station to proactively manage interference rather than reactively
Solution Approach 2:
A feedback loop is established where the reference UE measures CLI based on uplink timing information provided by the base station, reports the CLI measurement results back to the base station, which then uses this feedback to determine and provide updated uplink timing information for interfering UEs, creating a continuous interference management cycle
2Reliability
If uplink timing information is provided to detect interfering UE, then downlink receiving performance is improved, but device complexity increases due to additional information exchange and measurement procedures
Solution Approach 1:
The uplink timing information serves multiple functions: it is used by the base station to determine when interfering UEs transmit, provided to the reference UE for CLI measurement, and used to schedule uplink resources. This multi-functionality reduces the need for separate dedicated signaling for interference management
Solution Approach 2:
The reference UE autonomously performs CLI measurement using the provided uplink timing information and generates the measurement report itself, without requiring additional base station intervention or complex base station-side processing for each measurement, thus distributing the complexity to the UE where it already has the capability
Data Source
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AI summary
A method of a base station, includes: receiving, from a reference UE within a coverage of the base station, user equipment (UE) capability information and identifying whether the reference UE is capable of performing full-duplex communication; transmitting, to the reference UE, uplink timing information of an interfering UE, wherein the interfering UE is geographically adjacent to the reference UE; receiving, from the reference UE, a crosslink interference (CLI) measurement report; and transmitting, to the reference UE, information about an uplink channel, based on the CLI measurement report, wherein the uplink channel acts as interference to the reference UE.