Pulse Pilot Signaling for Faster Mobile Ad Hoc Network Joining
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Solution Overview
Problem
Mobile ad hoc networks for cognitive radio communication face significant delays when a terminal attempts to participate, as it must inquire about each frequency used by the network, leading to a lengthy participation process due to the large number of frequencies involved.
Innovation Solution
Incorporating a pulse pilot checking unit that identifies frequencies with a predetermined pulse signal, allowing the terminal to perform the participation process only for those frequencies, and a pulse pilot generating unit that outputs signals at unused frequencies, reducing the number of frequencies to check and enabling faster network participation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a terminal performs participation process for each of all various frequencies used by the network, then the terminal can identify all frequencies to participate in, but the time required for network participation becomes excessively long
Solution Approach 1:
The patent applies preliminary action by having the base station pre-assign specific frequencies to specific terminals before the participation process. When a terminal needs to join the network, it already knows which frequency to tune to based on its assigned identifier, eliminating the need to sequentially check all frequencies. This pre-prepared frequency assignment dramatically reduces participation time while maintaining accurate frequency identification.
2Adaptability or versatility
If the network uses various frequencies for cognitive radio communication, then the network can utilize unused frequencies efficiently, but the complexity of frequency management and participation process increases
Solution Approach 1:
The patent introduces a frequency assignment table as an intermediary mechanism managed by the base station. This table stores the correspondence between terminal identifiers and assigned frequencies. The base station acts as a mediator that provides frequency assignment information to terminals, simplifying their participation process. Terminals only need to query their assigned frequency from this intermediary structure rather than managing multiple frequencies themselves, reducing complexity while maintaining efficient frequency utilization.
3Reliability
If a terminal sequentially inquires about each predetermined frequency to participate in the network, then the terminal can ensure it finds the correct frequency, but the participation process takes much time
Solution Approach 1:
The base station performs preliminary frequency assignment based on terminal identifiers before the terminal attempts to join the network. This pre-computed frequency mapping ensures reliability because the base station (which has full knowledge of network frequency usage) makes the assignment, while simultaneously improving productivity because the terminal receives this assignment information in advance and does not need to sequentially probe frequencies during the actual joining process.
Data Source
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AI summary
[Problem]A mobile ad hoc network (referred to as a "network" below) including the communication terminals (referred to as a "terminal" below) for cognitive radio communication in Patent Literature 1 has a problem that it takes time for the terminal to newly participate in the network. [Solution]A radio communication terminal already participating in a mobile ad hoc network includes a pulse pilot generating unit which converts a pulse signal having a predetermined pattern into a radio signal and outputs the obtained radio signal at an unused frequency, after participating in the mobile ad hoc network. A radio communication terminal to participate in a mobile ad hoc network includes a pulse pilot checking unit which checks whether any pulse signal having a predetermined pattern exists in a radio signal for each predetermined frequency and performs a participation process for the frequency of each radio signal including the pulse signal, the participation process including inquiring whether the radio communication terminal can participate in the mobile ad hoc network.