RACH-Based Self-Interference Measurement in 5G
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Solution Overview
Problem
Wireless communication systems, particularly 4G and 5G systems, face interference issues due to half-duplex and full-duplex communications, which affect reliability and latency, and existing self-interference measurement methods using reference signals are inefficient, leading to increased latency.
Innovation Solution
Configuring communication devices to measure self-interference using Random Access Channel (RACH) signals, which include a RACH preamble or payload, allowing for improved reliability and reduced latency by accommodating time misalignment and eliminating the need for timing advance in self-interference measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reference signal-based self-interference measurement methods are used, then measurement capability is provided, but latency increases and efficiency decreases
Solution Approach 1:
The patent inverts the traditional approach by using uplink RACH signals (intended for random access) to measure downlink self-interference. Instead of using dedicated downlink reference signals for measurement, the system repurposes uplink transmission signals to characterize downlink interference, thereby eliminating the need for separate measurement procedures and reducing latency.
Solution Approach 2:
The RACH signal serves multiple functions simultaneously: it enables random access procedure and provides self-interference measurement capability. This multi-functionality eliminates the need for dedicated reference signals for measurement purposes, thereby reducing signaling overhead and measurement latency while improving overall system efficiency.
2Productivity
If full-duplex communications are implemented to improve communication efficiency, then spectral efficiency increases, but self-interference problems worsen
Solution Approach 1:
The system uses feedback from the measured self-interference levels to dynamically adjust communication parameters. By continuously measuring self-interference using RACH signals and reporting these measurements to the network, the system can adaptively optimize full-duplex operation, selecting appropriate duplex modes and adjusting transmission parameters to mitigate interference while maintaining high spectral efficiency.
3Measurement precision
If timing advance procedures are used in traditional measurement methods, then synchronization is achieved, but measurement complexity and latency increase
Solution Approach 1:
The patent extracts the essential measurement function from the complex timing advance procedure. By using RACH signals that are inherently designed for random access without requiring timing advance alignment, the system separates the measurement function from the synchronization complexity, achieving accurate self-interference measurement while eliminating the need for complex timing advance calculations and procedures.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device may transmit a random access channel (RACH) signal using a transmit beam of a set of transmit beams. The RACH signal may include a RACH preamble. The communication device may receive, based on the transmitted RACH signal, a receive beam of a set of receive beams. The communication device may determine a level of self-interference of the received beam. For example, the communication device may measure the level of self-interference of the received beam based on the transmitted RACH signal including the RACH preamble. The communication device may operate in a mode based on the determined level of self-interference.