Cognitive Radio Rendezvous for Multi-Transceiver Users
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Solution Overview
Problem
Current cognitive radio network rendezvous methods are inefficient for unlicensed users with multiple transceivers, as they assume a single transceiver and do not fully utilize multiple transceivers, leading to prolonged time-to-rendezvous and inapplicability when users have different quantities of transceivers or varying channel quality.
Innovation Solution
A method that includes two rendezvous approaches: a single-transceiver rendezvous method and a multiple-transceiver rendezvous method, with channel hopping sequences generated in stages to ensure rendezvous within a finite time, utilizing different transceivers effectively and considering varying channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-transceiver rendezvous method is used, then the system is simple to implement, but the time-to-rendezvous is prolonged and multiple transceivers are not utilized
Solution Approach 1:
The patent segments the rendezvous process into two distinct methods: single-transceiver rendezvous for users with one transceiver, and multiple-transceiver rendezvous for users with multiple transceivers. This segmentation allows each method to be optimized for its specific scenario, reducing overall system complexity while improving time-to-rendezvous for multi-transceiver users through parallel channel monitoring
Solution Approach 2:
The patent introduces a new dimension by adding multiple transceivers to the rendezvous system. Instead of having a single transceiver monitor one channel at a time, multiple transceivers enable simultaneous monitoring of multiple channels, transforming the rendezvous process from a sequential single-dimension approach to a parallel multi-dimension approach, thereby significantly reducing time-to-rendezvous
2Device complexity
If a common channel hopping sequence is used for all unlicensed users, then channel coordination is simplified, but rendezvous cannot be achieved when available channels vary by space
Solution Approach 1:
The patent applies local quality by allowing each unlicensed user to generate and use its own local channel hopping sequence based on its specific available channels and location. Instead of forcing a uniform common sequence that may not work for all users, each user adapts the hopping sequence to its local channel conditions, ensuring reliable rendezvous while maintaining coordinated operation across the network
Solution Approach 2:
The patent enables parameter changes by allowing unlicensed users to dynamically adjust their channel hopping sequences based on varying channel conditions and available channels. The hopping parameters (such as channel selection, hopping rate, and sequence pattern) can be modified according to local conditions, ensuring that rendezvous can be achieved even when available channels differ across spatial locations
3Device complexity
If unlicensed users are assumed to have only one transceiver, then the rendezvous algorithm is simpler, but it becomes inapplicable when users have different quantities of transceivers
Solution Approach 1:
The patent achieves universality by designing a rendezvous system that can handle both single-transceiver and multiple-transceiver scenarios within a unified framework. The system automatically selects the appropriate rendezvous method based on the user's transceiver quantity, making it universally applicable to all unlicensed users regardless of their equipment configuration. This multi-functional approach eliminates the need for separate algorithms for different transceiver quantities
4Device complexity
If all transceivers monitor the same channel, then channel monitoring is simplified, but the probability of rendezvous decreases when channels are distributed across multiple transceivers
Solution Approach 1:
The patent segments the channel monitoring task across multiple transceivers, with each transceiver assigned to monitor specific channels based on the available channel set. This segmentation increases the rendezvous probability by distributing monitoring efforts across multiple channels simultaneously, while maintaining manageable complexity through systematic channel assignment and coordination mechanisms
Data Source
AI summary
The present invention discloses a method for rendezvous of unlicensed users having multiple transceivers in cognitive radio networks, including four stages: an initial stage: setting an initial communication environment; a stage of selecting a rendezvous method: selecting a method for generating a channel hopping sequence according to the quantity of transceivers; a stage of generating a channel hopping sequence: using a single-transceiver rendezvous method or a multiple-transceiver rendezvous method to generate a channel hopping sequence; and a rendezvous stage: running, by an unlicensed user, on a corresponding channel and attempting to rendezvous with a destination node of the unlicensed user, where if rendezvous is achieved, the rendezvous process ends; and if rendezvous is not achieved, the rendezvous process continues until rendezvous is achieved. By using the present invention, the problem of rendezvous of unlicensed users equipped with different quantities of transceivers in heterogeneous cognitive radio networks is effectively resolved.