Signal Buffering for Licensed Shared Access Spectrum
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Solution Overview
Problem
Existing Licensed Shared Access (LSA) and other secondary spectrum access technologies face challenges in efficiently utilizing shared spectrum bands, particularly in device-to-device (D2D) communications, due to time-consuming spectrum negotiation phases and limited spectrum availability.
Innovation Solution
Implementing a method that allows immediate data transmission during transmission opportunities in the user plane while spectrum negotiation occurs in the control plane, using pre-configured deterministic spectrum access to reduce time costs and optimize spectrum usage, applicable to LSA, TV White Space Technology, and Dynamic Spectrum Access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spectrum negotiation protocols are used in LSA, then spectrum access reliability is ensured, but time cost for accessing spectrum increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-configuring deterministic spectrum access patterns and pre-establishing transmission opportunities. The system pre-defines when and how secondary users can access licensed spectrum, eliminating the need for real-time negotiation handshakes. This allows immediate data transmission during pre-identified transmission opportunities while maintaining reliability through pre-coordinated access rules.
Solution Approach 2:
The patent segments the communication process into control plane operations (spectrum negotiation) and user plane operations (immediate data transmission). By separating these functions, the system can maintain reliable spectrum access coordination while enabling low-latency data transmission during transmission opportunities without waiting for complete negotiation cycles.
2Productivity
If immediate data transmission is enabled during transmission opportunities, then productivity increases, but device complexity increases due to buffering requirements
Solution Approach 1:
The patent introduces a buffer as an intermediary component between the receiver and decoder. The buffer temporarily stores demodulated data packets, allowing the receiver to immediately transmit or store data during transmission opportunities without requiring synchronous decoding. This intermediary buffer decouples the reception and decoding processes, enabling high productivity while managing device complexity through a simple storage mechanism.
3Loss of time
If spectrum negotiation is performed in control plane while data transmission occurs in user plane, then time cost is reduced, but loss of information increases due to potential mismatch
Solution Approach 1:
The patent implements feedback mechanisms where the receiver monitors transmission opportunities and provides status information back to the transmitter. The buffer stores demodulated packets and provides feedback on their availability, ensuring that data transmission in the user plane remains synchronized with control plane negotiations. This feedback loop prevents information loss by maintaining coordination between control and data planes.
Data Source
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AI summary
Reducing latency or time for accessing (transmitting) on Licensed Shared Access (LSA) spectrum (also Authorized Shared Access ASA, Dynamic Spectrum Access DSA, Opportunistic Spectrum Access OSA). Mainly for D2D device to device communication. The transmitting mobile device transmits the data on the first detected transmission opportunity regardless of whether the LSA licensee has set up the use of the LSA spectrum bands over the base station (spectrum negotiation), in other words a maximum exploitation of the transmission opportunity in the opportunistic spectrum access technology may be implemented by utilizing an LSA enabled user plane channel even before the dedicated control plane channel is set up. The D2D transmitter transmits simultaneously data to the D2D receiver and spectrum negotiation control signal to the base station. The receiver waits for a go signal from the base station before decoding the buffered received D2D signal.