Base Station Beam Coordination for Dynamic TDD Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communications systems employing dynamic time division duplexing (TDD), inter-base-station cross-link interference occurs due to dynamically changing uplink and downlink beam patterns, leading to performance degradation.
Innovation Solution
Aggressor and victim base stations coordinate and communicate beam pattern information to identify and mitigate excessive interference by exchanging messages containing beam pattern entries, reference signals, and interference measurements, allowing them to compromise on beam patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD is used to adapt scheduling to communication demands, then adaptability and resource utilization improve, but inter-base-station cross-link interference increases
Solution Approach 1:
The patent implements a feedback mechanism where victim base stations measure interference from aggressor base station beams and report back to the aggressor base station. The aggressor base station receives interference measurements and beam pattern information from victim base stations, then adjusts its beam patterns accordingly to reduce cross-link interference while maintaining dynamic TDD scheduling flexibility.
Solution Approach 2:
The patent changes beam pattern parameters dynamically based on interference conditions. The aggressor base station receives beam pattern information from the victim base station and modifies its beamforming parameters (such as beam directions, widths, or powers) to reduce interference on resources where the victim base station is experiencing excessive interference, while still maintaining adaptive scheduling capabilities.
2Object-generated harmful factors
If beam patterns are optimized to reduce interference, then cross-link interference decreases, but coordination complexity between base stations increases
Solution Approach 1:
The patent employs preliminary action by having the aggressor base station inform the victim base station in advance about its intended beam patterns before actual transmission occurs. This allows the victim base station to prepare interference measurements and potential alternative beam patterns, enabling proactive interference management rather than reactive adjustments, thus reducing overall coordination complexity.
Solution Approach 2:
The patent uses standardized coordination signaling messages as intermediaries between aggressor and victim base stations. These predefined message formats (such as beam pattern information messages and interference measurement reports) structure the coordination process, making it more manageable and less complex by providing a standardized framework for information exchange and decision-making.
3Object-generated harmful factors
If beam pattern information is exchanged between base stations, then interference mitigation capability improves, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by having base stations exchange beam pattern information selectively rather than continuously. The aggressor base station sends beam pattern information to the victim base station only when intending to use beams that may cause interference, and the victim base station provides interference measurements only for relevant beams. This reduces signaling overhead compared to continuous full-duplex information exchange, while still achieving effective interference mitigation.
Data Source
AI summary
A base station receives, from an originating base station, an indication including a first reference signal and a second reference signal and an information element (IE) comprising a first beam pattern parameter indicating a first beam and a first plurality of resources and a second beam pattern parameter indicating a second beam and a second plurality of resources. The base station performs measurements on the reference signals and obtains a first and a second expected interference level associated respectively with the first and the second plurality of resources. The base station determines a preference to experience the first expected interference on the second plurality of resources and the second expected interference on the first plurality of resources. The base station sends, to the originating base station, based on the preference, a second information element indicating to swap the first plurality of resources for the second plurality of resources.