TDD Configuration Selection for CBRS Spectrum Coordination
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Solution Overview
Problem
Current CBRS systems face challenges in managing Time Division Duplex (TDD) configurations, leading to interference between GAA and PAL CBSDs due to mismatched configurations, which can result in inefficient spectrum allocation and interference, particularly when different TDD configurations are proposed within the same TCCS, forcing procedures into fallback modes.
Innovation Solution
The proposed solution involves a method and apparatus for TDD Configuration Selection that allows for dynamic allocation of bandwidth and TDD configurations, enabling maximum cooperation between GAA and PAL CBSDs by partitioning the CBRS frequency spectrum into sub-bands, allowing negotiation of TDD configurations within these groups, and using weighted voting to ensure fair and efficient spectrum usage, thereby avoiding fallback modes and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different TDD configurations are used by GAA and PAL CBSDs to meet diverse traffic requirements, then adaptability and traffic optimization are improved, but interference between CBSDs increases and spectrum allocation efficiency deteriorates
Solution Approach 1:
The patent divides the CBRS spectrum into multiple TDD configuration groups, where each group uses a specific TDD configuration. This segmentation allows different groups to operate with different configurations (adapting to diverse traffic needs) while reducing interference between groups through coordinated resource allocation and guard period management.
Solution Approach 2:
The patent assigns different TDD configuration characteristics to different spectrum segments based on local traffic requirements. Downlink-centric configurations are assigned to segments with downlink-heavy traffic, while uplink-centric configurations are assigned to segments with uplink-heavy traffic, optimizing each local segment while maintaining overall system coordination.
2Productivity
If TDD configuration negotiation is implemented among CBSDs, then spectrum allocation efficiency is improved, but system complexity and coordination overhead increase
Solution Approach 1:
The patent introduces a spectrum coordination entity that acts as an intermediary to manage TDD configuration negotiations between CBSDs. This mediator consolidates the complexity of multi-party coordination, implementing auction-based or voting-based mechanisms to select TDD configurations while reducing the direct coordination burden on individual CBSDs.
Solution Approach 2:
The patent performs TDD configuration negotiation and selection before actual data transmission begins. The spectrum coordination entity pre-determines the TDD configurations for different CBSDs based on traffic requirements and interference considerations, establishing a stable configuration framework that simplifies subsequent operations.
3Reliability
If fallback procedures are used to handle TDD configuration mismatches, then system reliability is maintained, but productivity and spectrum utilization efficiency deteriorate
Solution Approach 1:
The patent prepares multiple TDD configuration options and selection mechanisms in advance through the spectrum coordination entity. By pre-establishing alternative configurations and negotiation protocols, the system can handle mismatches and changes proactively without resorting to fallback procedures, thereby maintaining both reliability and productivity.
4Adaptability or versatility
If weighted voting mechanisms are implemented for TDD configuration selection, then fairness in spectrum allocation is improved, but computational complexity and decision-making time increase
Solution Approach 1:
The patent implements weighted voting where CBSDs are assigned different weights based on their service requirements, traffic patterns, and priority levels. This parameter-based weighting system achieves fair spectrum allocation by considering diverse operational characteristics, while the weights can be pre-calculated or dynamically adjusted to balance fairness with decision-making efficiency.
Data Source
AI summary
Time Division Duplex (TDD) Configuration Selection for CBRS operation with TDD Configuration Mismatch methods and apparatus are disclosed. The methods and apparatus allocate CBRS bandwidth and select TDD configurations in a manner that allows maximum cooperation between GAA and PAL CBSDs, and includes procedures that avoid forcing the procedures into a fallback mode whenever a TDD configuration mismatch occurs. The methods and apparatus allocate an appropriate TDD configuration across all of the CBSDs (BS/APs) in the CBRS network so that there is minimal interreference between the CBSDs and so that there is uniform usage of the bandwidth in terms of use cases across all of the CBSDs in a given CBRS network. The disclosed methods and apparatus determine how to select the correct TDD configurations for the CBSDs (or BS/APs) based on the constitution of the CBSDs, and taking the GAA and PAL CBSD requirements into account.