CBSD Multi-Grant Channel Allocation via Priority Lists
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Solution Overview
Problem
Current Citizen Broadband Radio Service (CBRS) systems face inefficiencies in channel allocation, as devices can only request one contiguous channel at a time, leading to repeated requests and increased traffic, power consumption, and latency due to the existing single-grant procedure.
Innovation Solution
Implementing a multi-grant procedure that allows Citizens Broadband Radio Service Devices (CBSDs) to request multiple non-contiguous channels in a single request, with a list of desired channels prioritized, enabling the Spectrum Access System (SAS) to grant access based on availability and preference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a CBSD requests multiple channels through repeated single-grant requests, then the device can eventually acquire desired channels, but this results in increased traffic, power consumption, and latency
Solution Approach 1:
The patent combines multiple single-grant requests into a single multi-grant request that can request multiple non-contiguous channels simultaneously. The CBSD sends one grant request message containing a list of desired channels with priority ordering, and the SAS responds with a single grant response message allocating multiple channels, thereby merging multiple communication rounds into one and reducing latency.
Solution Approach 2:
The CBSD prepares a pre-ordered list of desired channels with priority rankings before sending the grant request. This preliminary ordering allows the SAS to quickly evaluate and allocate channels based on the predetermined preference order without requiring multiple back-and-forth negotiations, thus reducing the time needed for channel acquisition.
2Adaptability or versatility
If a CBSD sends repeated grant requests to acquire multiple channels, then the device can build its channel portfolio, but this generates unwanted traffic between CBSD and SAS
Solution Approach 1:
The patent merges multiple separate grant request messages into a single multi-grant request message that contains a list of desired channels. The SAS processes this single message and returns a single grant response message with multiple channel allocations, thereby significantly reducing the number of messages exchanged and the overall traffic volume between CBSD and SAS.
Solution Approach 2:
The grant request message is segmented to include a structured list of desired channels with priority indicators. This segmentation allows the CBSD to present multiple channel preferences in an organized manner within a single message, enabling the SAS to efficiently evaluate and allocate channels without requiring multiple separate requests.
3Device complexity
If a CBSD uses the single-grant procedure to request channels, then the protocol implementation is simple, but the device cannot request non-contiguous channels efficiently
Solution Approach 1:
The patent extends the existing grant request message format to serve multiple functions: it can request a single contiguous channel or multiple non-contiguous channels by including a list of desired channels with priority ordering. The SAS responds with a unified grant response that can allocate one or multiple channels based on availability and priority, making the protocol universally applicable to both single and multi-channel scenarios without requiring separate procedures.
Solution Approach 2:
The patent introduces dynamic elements to the grant request and response messages, including a prioritized list of desired channels and a mechanism for the SAS to allocate channels based on availability and priority order. This dynamic approach allows the system to adapt to different channel allocation scenarios (single or multiple channels, contiguous or non-contiguous) while maintaining a unified protocol structure.
Data Source
AI summary
A method performed by a Citizens Broadband Radio Service (CBRS) device (CBSD), may comprise, generating a grant request message comprising information on a number of grants and information on operation parameters. Each of the operation parameters is associated with a desired channel identified based on a list of desired channels. The method may comprise sending the grant request message to a Spectrum Access System (SAS).