Dynamic TDD Beam Coordination for Cross-Link Interference
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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, degrading performance and causing significant interference between neighboring base stations.
Innovation Solution
Aggressor and victim base stations communicate and coordinate beam pattern information to identify and mitigate excessive interference by exchanging messages containing beam pattern entries, including reference signals, resources, and transmission power parameters, allowing for dynamic adjustment of beam patterns to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD is used to adapt scheduling to communication demands, then scheduling flexibility and spectral efficiency are improved, but cross-link interference between base stations increases
Solution Approach 1:
The system performs preliminary actions by having the aggressor base station transmit beam pattern information elements before actual interference occurs. The victim base station measures interference based on this advance information and reports high-interference beams, allowing preemptive coordination to avoid cross-link interference while maintaining dynamic scheduling flexibility.
Solution Approach 2:
The system implements feedback mechanisms where the victim base station measures interference and reports back to the aggressor base station about which beams cause excessive interference. This feedback loop enables continuous coordination and adjustment of beam patterns to mitigate cross-link interference while preserving scheduling adaptability.
2Productivity
If beam patterns are dynamically adjusted to improve spectral efficiency, then communication performance is improved, but interference between neighboring base stations increases
Solution Approach 1:
The system transmits beam pattern information elements in advance before actual data transmission occurs. This allows the victim base station to measure interference levels based on the intended beam patterns and report back, enabling preemptive adjustments to avoid harmful interference while maintaining high spectral efficiency through dynamic beam adjustment.
Solution Approach 2:
The system establishes a feedback mechanism where interference measurements are reported from the victim base station to the aggressor base station. This feedback enables continuous optimization of beam patterns to maximize spectral efficiency while minimizing interference through coordinated adjustments between neighboring base stations.
3Object-generated harmful factors
If beam pattern information is exchanged between base stations to reduce interference, then cross-link interference is reduced, but system complexity increases
Solution Approach 1:
The system uses standardized information elements (beam pattern IE) as intermediaries to facilitate communication between base stations. These structured information containers simplify the exchange of beam pattern data and interference measurements, reducing the complexity of coordination while effectively managing cross-link interference through standardized protocols.
Data Source
AI summary
Various aspects of the present disclosure relate to a base station and methods that manage cross-link interference during wireless communication especially in dynamic time division duplexing (TDD) using flexible symbols. In one aspect, a processor of an originating base station is configured to cause the base station to: determine downlink transmission parameters to communicate downlink resources to the one or more user equipment (UEs); and identify a spatial pattern to communicate the downlink resources to the one or more UEs. The processor is further configured to cause the base station to communicate, to a second base station, a spatial pattern information element (IE) containing at least one indication of the spatial pattern for cross-link interference management, the spatial pattern IE enabling the second base station to mitigate interference.