Wireless Spectrum Sharing With Radar-Aware Duty Cycling
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Solution Overview
Problem
Conventional wireless networks face challenges in coexistence with high-priority radar systems due to disruptive channel deallocation and transmission power constraints, leading to network coverage issues and interference.
Innovation Solution
Implementing a duty cycle-based coexistence mode that allows sharing of wireless spectrum between high-priority radar systems and low-priority wireless stations, using naval radar waveform parameters to control resource usage and adjust transmission power levels based on radar direction and duty cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If CBSDs are moved to different operating channels due to incumbent activity, then interference to radar systems is reduced, but network coverage and connectivity are degraded
Solution Approach 1:
The patent implements periodic channel switching where CBSDs alternate between operating on the incumbent's channel and a secondary channel according to a duty cycle. This periodic action allows the system to provide continuous service to wireless stations while limiting the time-averaged interference to the incumbent radar system, thus resolving the contradiction between reducing interference and maintaining network reliability.
2Object-affected harmful factors
If transmission power of CBSDs is constrained to meet interference targets, then interference to radar systems is reduced, but network coverage range is limited
Solution Approach 1:
The patent dynamically adjusts the transmission power of CBSDs based on their operational state. When operating on the incumbent's channel, power is constrained to meet interference targets. When switched to the secondary channel, full transmission power is restored. This dynamic power adjustment allows the system to maintain coverage range while limiting interference through temporal and spatial power management.
3Productivity
If duty cycle-based sharing is implemented, then wireless bandwidth is efficiently shared, but transmission continuity for low-priority users is disrupted
Solution Approach 1:
The patent establishes predetermined switching patterns and duty cycles that are configured in advance. CBSDs and wireless stations are notified of upcoming channel switches, allowing them to prepare and maintain continuous connectivity. This preliminary action ensures that while bandwidth is efficiently shared through duty cycling, transmission continuity is preserved through coordinated, pre-planned channel transitions.
Data Source
AI summary
Communication management hardware controls operation of multiple wireless stations in a network environment. For example, the communication management hardware initially assigns wireless bandwidth for use by multiple wireless stations in a wireless network environment to communicate amongst each other. The communication management hardware monitors use of the wireless bandwidth. In response to detecting use of the wireless bandwidth by an incumbent entity having higher priority rights than the multiple wireless stations, the communication management hardware operates in a shared time-division mode in which both the multiple wireless stations and the incumbent entity share use of the wireless bandwidth in a control period according to a duty cycle in which the wireless stations are provided full use of the wireless bandwidth during a first portion of the control period and the wireless stations are provided reduced use of the wireless channels for a second portion of the control period.