Spectrum Access System Traffic-Aware Channel Allocation
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Solution Overview
Problem
Current Spectrum Access Systems in CBRS networks fail to efficiently allocate frequency spectrum due to neglecting adjacent channel interference, leading to suboptimal use of limited frequency resources and poor Quality of Service for user equipment devices.
Innovation Solution
The system determines the type of traffic a CBSD is carrying and uses this information, along with uplink bit error rates and power headroom, to select frequency channels that minimize interference, specifically choosing channels with low adjacent or co-channel interference based on traffic type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Spectrum Access System assigns the same frequency spectrum to multiple CBSDs to maximize spectrum utilization, then spectrum efficiency is improved, but co-channel interference increases
Solution Approach 1:
The patent applies local quality by making the channel assignment decision specific to each CBSD's location and traffic characteristics. The SAS evaluates co-channel interference levels at each CBSD's geographical location and assigns channels accordingly, allowing different local conditions to dictate channel assignments rather than applying a uniform approach
Solution Approach 2:
The patent implements dynamics by continuously monitoring traffic types (uplink-dominated, downlink-dominated, or balanced) and dynamically adjusting channel assignments based on current network conditions. The SAS can reassign channels when traffic patterns change or interference conditions evolve, making the system adaptive rather than static
2Object-affected harmful factors
If the Spectrum Access System optimizes channel assignment based only on co-channel interference, then co-channel interference is minimized, but adjacent channel interference is neglected leading to suboptimal spectrum usage
Solution Approach 1:
The patent applies parameter changes by expanding the set of parameters considered in channel assignment from only co-channel interference to include both co-channel and adjacent channel interference metrics. This multi-parameter approach allows the SAS to make more informed decisions that balance both types of interference while optimizing spectrum utilization
3Device complexity
If the Spectrum Access System assigns channels without considering traffic type, then assignment complexity is reduced, but Quality of Service deteriorates due to inadequate interference management
Solution Approach 1:
The patent implements self-service by enabling CBSDs to autonomously determine and report their own traffic types (uplink-dominated, downlink-dominated, or balanced) to the SAS. This self-reporting mechanism simplifies the overall system architecture compared to centralized monitoring while still enabling traffic-aware channel assignment that improves QoS
Data Source
AI summary
Methods, systems and apparatus for allocating frequency spectrum resources in a Citizens Broadband Radio Service network. An exemplary method embodiment includes the steps of: receiving, by a Spectrum Access System (SAS), a channel message from a Citizens Broadband Radio Service Device (CBSD); selecting, by the SAS, in response to the received channel allocation message, a first frequency spectrum channel from a plurality of available frequency spectrum channels based on a type of traffic the CBSD is carrying; assigning, by the SAS, the selected first frequency spectrum channel to the CBSD for use in wireless communications with user equipment devices; communicating, by the SAS, information identifying the assigned first frequency spectrum channel to the CBSD. When the determined type of traffic being carried by the CBSD is said uplink dominated traffic basing said first frequency spectrum channel selection on adjacent channel interference.