Logical Channel Hopping Sequence Design for Spectrum Fairness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently utilizing frequency hopping channels to ensure equal occupancy time for each channel, particularly in shared radio frequency spectrum bands, to prevent any transmitter from dominating the spectrum.
Innovation Solution
The method involves identifying an anchor channel and a set of physical hopping channels, mapping them to logical channels, and determining a hopping sequence where each logical channel is used an equal number of times within a given timeframe, using pseudo-random sequences based on the device's location and transmission time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency hopping channels are utilized without equal occupancy design, then communication flexibility is improved, but spectrum fairness deteriorates as certain channels may be occupied disproportionately
Solution Approach 1:
The patent implements periodic action by designing a hopping sequence that systematically cycles through frequency hopping channels in a predetermined pattern, ensuring each channel is occupied for equal durations within a hopping period. This periodic structure prevents any single channel from being dominated while maintaining flexible communication through the hopping mechanism.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the hopping sequence parameters (such as channel selection order, hopping period, and occupancy time) to achieve equal occupancy across all frequency hopping channels. This ensures spectrum fairness while preserving communication flexibility through controlled parameter variation.
2Device complexity
If unequal channel occupancy is allowed, then system complexity is reduced, but coexistence with other devices deteriorates due to spectrum interference
Solution Approach 1:
By implementing periodic hopping sequences with equal occupancy requirements, the patent creates a structured pattern that reduces interference with other devices operating in the same spectrum. The periodic nature provides predictability that helps avoid random collisions while maintaining manageable system complexity through standardized sequence design.
Solution Approach 2:
The patent incorporates feedback mechanisms where the hopping sequence is designed based on detected spectrum conditions and interference patterns. This feedback-driven approach allows the system to adjust its channel occupancy strategy to minimize interference with other devices while maintaining equal occupancy among hopping channels.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described. A transmitting device may identify synchronization signals and a set of frequency hopping channels for communications as part of a discovery reference signal (DRS) in an anchor channel. The set of frequency hopping channels may include a sequence to indicate an order for utilizing each hopping channel of the set of hopping channels. In some cases, the hopping sequence may be a pseudo random sequence. Additionally, the hopping sequence may defined such that a non-repeating hopping sequence or pattern which visits all hopping frequencies before revisiting the same frequency is utilized. As such, each hopping channel may be utilized an equal number of times within a period of time and have an approximately equal occupancy time to the other hopping channels.