Beam Failure Detection Using SRS-Based CLI Measurement
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Solution Overview
Problem
High-density network deployments lead to Cross Link Interference (CLI) affecting the quality of radio links between network devices and terminal devices, which complicates Beam Failure Recovery (BFR) procedures.
Innovation Solution
A mechanism where terminal devices perform CLI measurements on Sounding Reference Signals (SRS) from adjacent devices, followed by Beam Failure Detection (BFD), and network devices coordinate CLI elimination configurations to disable interfering beams, enabling effective BFR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-density network deployment is implemented to increase network capacity, then network coverage and service capability are improved, but Cross Link Interference (CLI) between adjacent devices increases, degrading radio link quality
Solution Approach 1:
The patent performs CLI measurements on Sounding Reference Signals (SRS) from adjacent terminal devices before beam failure detection occurs. By proactively measuring CLI levels and identifying interfering beams in advance, the system can prepare CLI elimination configurations that prevent beam failure caused by interference, rather than reacting after failure occurs.
Solution Approach 2:
The patent converts the harmful CLI effect into useful information by measuring SRS signals from adjacent devices. These measurements identify which beams are experiencing interference, allowing the network device to selectively disable only the interfering beams while maintaining others. This transforms the harmful interference into actionable intelligence for beam management optimization.
2Stability of the object's composition
If regular beam adjustment procedures are used to adapt to environmental changes, then beam alignment is maintained, but the response time is insufficient when rapid beam blocking occurs
Solution Approach 1:
The system performs CLI measurements and identifies candidate beams for failure in advance, before actual beam failure occurs. When beam failure is detected, the network device can immediately activate pre-prepared CLI elimination configurations, significantly reducing the recovery time compared to standard beam adjustment procedures that would require full beam sweeping and re-establishment.
Solution Approach 2:
The patent prepares CLI elimination configurations in advance that include alternative beam options and interference mitigation strategies. When beam failure occurs, these pre-prepared configurations act as a cushion, allowing rapid switching to alternative beams or interference-free paths without requiring time-consuming re-establishment procedures.
3Measurement precision
If CLI measurements are performed on SRS signals to detect beam failure, then beam failure detection accuracy is improved, but false alarms increase due to CLI interference
Solution Approach 1:
The patent extracts and separately analyzes the CLI component from the overall signal measurement. By measuring SRS signals specifically from adjacent terminal devices and identifying which portion of the received signal is due to CLI versus desired signal, the system can subtract or compensate for the interference component. This extraction approach allows accurate beam failure detection while filtering out false alarms caused by CLI.
Solution Approach 2:
The SRS signal from adjacent terminal devices serves as an intermediary that carries information about both the desired signal and the CLI interference. By using this intermediary measurement, the system can distinguish between actual beam failure conditions and temporary interference effects, reducing false alarms while maintaining detection accuracy.
4Object-affected harmful factors
If candidate beams are disabled for the second terminal device to eliminate CLI, then interference is reduced, but the number of available beams for the second terminal device decreases
Solution Approach 1:
The patent applies CLI elimination configurations selectively and locally rather than globally. Only specific candidate beams that are identified as causing interference to the first terminal device are disabled for the second terminal device. Other beams that do not cause interference remain available, allowing the second terminal device to maintain flexibility in beam selection while eliminating only the problematic interfering beams.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communications. According to embodiments of the present disclosure, a first terminal device performs a CLI measurement associated with a transmit beam of a first network device on a Sounding Reference Signal (SRS) received from a second terminal device. Then, the first terminal device performs a Beam Failure Detection (BFD) procedure based on the CLI measurement.