Uplink Sensing Feedback Channel for Spectrum Management
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Solution Overview
Problem
In cognitive radio systems, the high overhead of sensing reporting in dynamic spectrum allocation leads to inefficient spectrum management, as each UE and sensor node requires separate uplink channels for reporting, increasing signaling overhead and interference control challenges.
Innovation Solution
A radio access technology (RAT) specific uplink sensing feedback channel (UL SFCH) is configured by network nodes to minimize reporting overhead, allowing flexible sensing information collection based on demand, with event-triggered reporting and encryption to ensure only authorized devices provide feedback, reducing unnecessary sensing traffic and improving spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate uplink channels are allocated for each UE and sensor node to report sensing information, then sensing reporting capability is improved, but signaling overhead increases
Solution Approach 1:
The patent combines sensing feedback from multiple UEs and sensor nodes into a single shared uplink channel (UL SFCH) instead of allocating separate channels to each device. This merging approach maintains complete sensing reporting capability while significantly reducing signaling overhead by eliminating redundant channel allocations and synchronization requirements.
Solution Approach 2:
The UL SFCH is designed as a universal channel that serves multiple functions: it carries sensing feedback from both UEs and sensor nodes, supports both synchronized and unsynchronized reporting modes, and can handle multiple types of sensing information. This multi-functionality eliminates the need for device-specific channel allocations.
2Object-generated harmful factors
If event-triggered reporting with encryption is implemented on the shared UL SFCH, then interference control is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic event-triggered reporting where UEs and sensor nodes transmit sensing feedback only when specific events occur (e.g., channel availability changes, interference threshold exceeded). This dynamic approach reduces unnecessary transmissions and inter-cell interference while the encryption mechanism ensures secure access. The event-triggered nature adapts transmission activity to actual network conditions rather than using fixed periodic reporting.
3Quantity of substance
If a shared uplink channel is used for sensing feedback, then signaling overhead is reduced, but measurement precision may deteriorate due to increased contention
Solution Approach 1:
The patent implements preliminary synchronization and resource allocation mechanisms where UEs and sensor nodes are pre-configured with transmission parameters, timing information, and encryption keys before using the shared UL SFCH. This preliminary setup ensures that even though the channel is shared, transmissions are coordinated to minimize contention and maintain measurement precision. The network can prioritize or schedule specific devices based on current needs.
Data Source
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AI summary
A method at a network node for obtaining spectrum sensing information, the method communicating to at least one of a user equipment and a sensing node at least one event condition for spectrum sensing; providing to the at least one of the user equipment and the sensing node channel descriptors for reporting; and receiving a report from the at least one of the user equipment and the sensing node utilizing the channel descriptors, the report indicating the at least one event condition has been met.