Personal handyphone system
The Personal Handyphone System (PHS) is a mobile radio system in the range 1880 MHz - 1930 MHz. In China it is known as Xiǎolíngtōng (小灵通). It is mainly used there and in Japan , but also in Taiwan , Thailand and Vietnam , for example . It works with very small cells and is conceptually based on a wireless local loop , similar to cordless telephone systems . For users, PHS is little different from ordinary cell phones. In contrast to GSM networks, however, the system is "grafted" onto the existing landline telephony network; it is a wireless extension of the landline network.
China Telecom and China Netcom do not have a license to operate mobile telephony in China, but both companies operate PHS networks as these are not covered by the license terms. Local landline numbers are assigned for their Xiaolingtong connections. The popularity of the PHS in China is also due to the fact that there are no passive fees to be paid and that the devices are cheaply manufactured in China itself. The range is limited to a local network, for example a city. By the end of 2005, China Netcom had over 80 million subscribers.
The devices are very small and have a transmission strength of no more than 500 mW and a range of a few dozen to a maximum of a few hundred meters, in contrast to the range of GSM mobile phones, which is several kilometers. Therefore, rapid changes of location with PHS telephones (for example in vehicles) are not possible and they usually do not work outside of urban conurbations.
The Japanese network operator NTT DoCoMo switched off its PHS cellular network at the beginning of 2008. The provider had not added any new PHS customers to its network since May 2005. The only remaining PHS provider in Japan is Willcom (now Y! Mobile ), which claims to reach 99% of the Japanese population.
credentials
- ↑ https://www.heise.de/newsticker/meldung/NTT-DoCoMo-schliesst-PHS-Mobilfunknetz-177160.html
- ↑ https://www.heise.de/newsticker/meldung/Fujitsu-sperr-Dieben-den-Zugriff-aufs-Notebook-753169.html