RIM Reference Signal Phase Rotation for 5G Remote Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G communication systems, remote interference caused by atmospheric waveguide phenomena can lead to significant interference issues due to propagation delays, especially in TDD networks, where the interference from a distant aggressor base station affects a victim base station during its uplink period, and existing methods struggle to effectively manage this interference.
Innovation Solution
An electronic device in a wireless communication system identifies differences in carrier frequencies and performs phase rotation on OFDM symbols of the RIM RS, using cyclic prefix lengths and subcarrier spacings to achieve zero-phase alignment and frequency reuse, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase rotation is performed on OFDM symbols to achieve zero-phase alignment, then interference reduction is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying phase rotation values to OFDM symbols before transmission. The base station determines phase rotation values based on cyclic prefix lengths and subcarrier spacings, then applies these rotations in advance to align phases at the receiver, thereby reducing interference proactively rather than reactively.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting phase rotation values based on varying cyclic prefix lengths and subcarrier spacings. Different phase rotation parameters are applied to different OFDM symbols depending on their specific configuration, allowing optimal interference reduction while adapting to changing transmission conditions.
2Reliability
If frequency reuse is implemented through proper phase alignment, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies equipotentiality by ensuring that phase-aligned OFDM symbols from different base stations constructively combine at the receiver. By rotating phases to achieve zero-phase alignment, the system creates equivalent phase conditions (equipotential) across multiple transmitters, allowing frequency reuse without destructive interference.
Solution Approach 2:
The patent uses phase rotation as an intermediary mechanism to enable frequency reuse. The phase rotation operation acts as a mediator that transforms the signal phases into compatible configurations, allowing frequencies to be reused across different base stations while maintaining signal integrity through the intermediate phase alignment step.
Data Source
AI summary
An electronic device in a wireless communication system is provided. The electronic device includes a communication circuit, a memory, and a processor, wherein the memory stores instructions that cause the processor to identify a difference between a carrier frequency for communication with a terminal and a reference point set for a remote interference management (RIM) reference signal (RS), identify a first share obtained by dividing the difference into subcarrier intervals, and the remainder, rotate the phase of at least one subcarrier in a first orthogonal frequency-division multiplexing (OFDM) symbol including at least the other part of the RIM RS, based on at least one from among a cyclic prefix (CP) length of a second OFDM symbol including at least a part of the RIM RS, the carrier frequency, and the remainder, and rotate the phase of a subcarrier in the second OFDM symbol based on the carrier frequency.