ii) Independent on network device: The architecture should not involve any modification of network devices. Modifications that are dependent on network devices can lead to extra work being required to use new network devices and retain the modification because many new communication technologies may regularly appear on the market, and it will not be necessary to keep up with them. Furthermore, modification to the logic or firmware of network devices may make re-certification necessary owing to rules and regulation for radio devices. Therefore, realization of a method that does not require any modification to network devices or network drivers and connection software is considered to be ideal.