Spectrum Sharing for Prioritized and Non-Prioritized Users
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Solution Overview
Problem
Current wireless communication systems face challenges in managing access to shared spectrum between prioritized and non-prioritized users, often resulting in unnecessary limitations on non-prioritized users, especially in millimeter wave systems where precise beamforming is possible, leading to potential interference with prioritized users.
Innovation Solution
Non-prioritized user access terminals sense signal energy within a frequency band during periodic intervals, modifying their transmission by switching to different sub-bands or beams if energy thresholds are exceeded, allowing them to operate without interfering with prioritized users, even in the same coverage cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-prioritized users are completely blocked from accessing shared spectrum when prioritized users are present, then interference to prioritized users is eliminated, but network efficiency and availability for non-prioritized users deteriorate
Solution Approach 1:
The frequency spectrum is divided into multiple sub-bands, allowing non-prioritized users to access different sub-bands simultaneously with prioritized users without causing harmful interference. This segmentation enables parallel operations across different frequency portions while maintaining protection for prioritized users in their allocated sub-bands.
Solution Approach 2:
The system introduces spatial dimension through beamforming and directional transmission. Non-prioritized users can transmit in spatial directions that do not interfere with prioritized users, effectively adding a spatial dimension to the resource allocation problem and enabling simultaneous access without mutual interference.
2Device complexity
If non-prioritized users transmit without sensing mechanisms, then device complexity is reduced, but harmful interference to prioritized users increases
Solution Approach 1:
Non-prioritized users perform sensing operations before attempting transmission to detect whether prioritized users are currently accessing the spectrum. This preliminary action allows the system to prevent harmful interference without requiring continuous complex monitoring or control mechanisms during transmission.
Solution Approach 2:
The system implements a feedback mechanism where non-prioritized users sense the spectral environment and adjust their transmission behavior accordingly. If sensing detects prioritized user presence exceeding a threshold, the non-prioritized user defers transmission, creating a simple feedback loop that prevents interference without complex device architecture.
3Productivity
If sensing intervals are increased to reduce overhead, then network efficiency improves, but detection accuracy and responsiveness deteriorate
Solution Approach 1:
The system uses periodic sensing intervals to balance overhead reduction with adequate detection accuracy. By sensing at regular intervals rather than continuously, the system achieves sufficient knowledge of the spectral environment while minimizing overhead, and the periodic nature ensures that any changes in prioritized user presence are detected within a predictable time window.
Data Source
AI summary
Aspects relate to spectrum sharing for use in a wireless communication network that serves both prioritized and non-prioritized user access terminals. In one example, a user access terminal, e.g., a user equipment (UE), senses an amount of signal energy within a frequency band during one or more sensing intervals in response to a determination that the access terminal is a non-prioritized access terminal. If the amount of signal energy does not exceed a sensed energy threshold, the user access terminal transmits wireless signals following the sensing intervals. On the other hand, if the amount of signal energy exceeds the sensed energy threshold, the user access terminal modifies transmissions while the amount of signal energy sensed during one or more subsequent sensing intervals exceeds the sensed energy threshold. For example, the access terminal may delay or adjust transmissions until the amount of signal energy no longer exceeds the sensed energy threshold.