Remote Interference Reference Signal for TDD Network Mitigation
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Solution Overview
Problem
In time division duplexing (TDD) wireless communications networks, interference between base stations due to variable propagation conditions can lead to decreased throughput, especially in low latency systems that frequently switch between uplink and downlink transmissions, as increasing guard intervals to compensate for interference negatively impacts performance.
Innovation Solution
Implementing a remote interference reference signal (RI-RS) that allows base stations to identify and mitigate interference by transmitting specific signals, such as channel state information reference signals (CSI-RS) or cell-specific reference signals (CRS), which are used to detect and measure interference, enabling adjustments in transmission power or scheduling to minimize interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard intervals are increased to compensate for interference, then interference between base stations is reduced, but system throughput decreases
Solution Approach 1:
The patent implements a feedback mechanism where the victim base station measures interference levels using reference signals and reports measurements to the aggressor base station. The aggressor base station uses this feedback to dynamically adjust transmission power or scheduling decisions, resolving the contradiction by adapting to actual interference conditions rather than using fixed guard intervals
Solution Approach 2:
The patent changes the parameter being controlled from fixed guard interval duration to dynamic transmission power levels or scheduling configurations. By adjusting power parameters or scheduling parameters based on measured interference, the system maintains throughput while managing interference effectively
2Speed
If TDD configurations switch frequently between uplink and downlink, then low latency is achieved, but interference management becomes more difficult
Solution Approach 1:
The patent implements real-time feedback through reference signal transmissions and interference measurements that enable rapid adaptation to changing TDD configurations. This feedback loop simplifies interference management by providing automated, data-driven decisions rather than complex manual coordination
Solution Approach 2:
The system enables base stations to self-manage interference through autonomous measurement and reporting of interference conditions. Each base station independently measures interference using reference signals and triggers appropriate mitigation actions, reducing the overall complexity of network-wide coordination
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. An aggressor base station may cause interference at a remote victim base station. The victim base station may detect the interference and may transmit a remote interference reference signal (RI-RS) to the aggressor base station. The aggressor base station may identify and measure the interference based on the RI-RS, and may send a measurement of the interference to the victim base station. The base stations may then implement a mitigation technique based on the reported interference and other information exchanged via backhaul links. For example, the interference may be mitigated by modifying transmission at the aggressor base station or by modifying uplink scheduling at the victim base station.