Shared Radio Unit TDD Sub-Band Allocation for CLI Reduction
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Solution Overview
Problem
In shared radio unit architectures implementing time division duplexing (TDD), cross-link interference (CLI) occurs due to static downlink-to-uplink (DL:UL) ratios, which are not practical for non-static TDD, leading to signal degradation and reduced network capacity.
Innovation Solution
A shared RU architecture that supports non-static DL:UL ratios by dividing frequency bands into sub-bands and dynamically assigning these ratios based on network conditions and traffic patterns, using CLI management techniques like interference cancellation, power control, and beamforming to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If static DL:UL ratios are used in TDD, then cross-link interference is caused, but network capacity is reduced
Solution Approach 1:
The patent implements dynamic DL:UL ratio adjustment in shared RU architectures, allowing the system to transition from static to non-static TDD configurations. The DL:UL ratio is dynamically modified based on network conditions, traffic patterns, and interference levels, enabling the system to adaptively optimize performance while managing cross-link interference between different operators' cells.
Solution Approach 2:
The system changes the DL:UL ratio parameter dynamically across different time slots and frequency sub-bands. By modifying this key parameter based on real-time network conditions, the patent achieves optimal balance between utilizing network capacity and managing cross-link interference, allowing flexible adaptation to varying traffic demands and interference scenarios.
2Productivity
If non-static DL:UL ratios are implemented, then resource allocation is optimized, but system complexity increases
Solution Approach 1:
The patent divides the frequency band into multiple sub-bands and applies different DL:UL ratios to different sub-bands independently. This segmentation allows granular control of resources while distributing the complexity management across multiple smaller units. Each sub-band can be optimized separately based on local conditions, improving overall resource allocation efficiency without requiring complete system-wide complexity.
Solution Approach 2:
The shared RU architecture provides multi-functionality by supporting multiple operators and multiple DL:UL ratio configurations simultaneously. The same RU infrastructure serves multiple purposes: hosting multiple operators' cells, managing different TDD configurations, and adapting to various traffic patterns. This universal approach optimizes resource utilization while consolidating complexity management at the shared RU level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces cross-link interference, enhances network performance, and optimizes resource allocation, improving throughput and scalability in shared RU architectures.
Implementation Method 1
an RU can convert digital baseband signals into radio frequency (RF) signals, and transmit the RF signals to UE
Implementation Method 2
an RU can receive RF signals to UE, and convert the RF signals into digital baseband signals
Implementation Method 3
using CLI management techniques like interference cancellation, power control, and beamforming to minimize interference
Data Source
AI summary
Technologies for shared radio unit (RU) architectures supporting non-static time division duplexing (TDD) are described. One method includes dividing, into a plurality of sub-bands, a frequency band of a telecommunications network implementing a shared radio unit architecture, assigning, to each sub-band of the plurality of sub-bands, a respective guest operator of a plurality of guest operator of the telecommunications network, and allocating, for each sub-band assigned to the respective guest operator, at least one type of transmission to a plurality of time slots of the sub-band to implement time division duplexing.