The development course of PHS

Three stages of PHS development: 1996 ~ 1997 is the technical preparation period; 1998 ~ 2000 is the period of technology introduction; The market development period is 200 1 to 2003.

1996, China Mobile and China Telecom were separated. Xu Fuxin, director of Zhejiang Yuhang Telecommunications Bureau, proposed to graft PHS wireless local telephone to the fixed telephone network, and connect PHS wireless technology to the front end of China Telecom Network to become a small mobile phone built on the fixed network. Wu Ying, president of UT Starcom, became a partner of Xu Fuxin.

Yuhang District, Zhejiang 1998 1 officially opened PHS; The implementation of one-way charging, monthly fee of 20 yuan, tariff of 0.2 yuan per minute, marks the official entry of PHS into the China market.

In June 2000, the former Ministry of Information Industry issued a notice, positioning PHS as "the supplement and extension of fixed telephone", which indicated that the policy restricting the development of PHS was loosened.

In August 2002, PHS was opened in more than 200 cities in Chinese mainland. The network capacity of the system reaches more than 1 1 10,000 lines, and the number of online users exceeds 6 million.

From June 5438 to February 2002, PHS service was completely banned in areas other than Beijing and Shanghai.

In March 2003, former Minister of Information Industry Wu Jichuan told the media that the policy towards PHS was "no encouragement and no interference".

In March, 2003, PHS issued a number in Huairou District, Beijing, which officially broke through the policy restriction of "prohibiting the development of PHS business in Beijing, Tianjin, Shanghai and Guangzhou".

In September, 2003, UT Starcom announced that the number of users of China UT Starcom PHS exceeded150,000.

In February 2003, PHS in northern China 10 provinces and cities realized short message communication.

In February 2004, PHS conquered the last big city and officially entered Shanghai.

In April 2004, by the end of March 2004, the total number of PHS users in Chinese mainland had exceeded 47 million, covering 3 1 355 cities in provinces, municipalities and autonomous regions. The national PHS network capacity has reached 67 million.

In July, 2004, PHS and mobile phone realized short message intercommunication.

In May, 2005, PHS with separated machine and card went on the market, and Guangdong took the lead in commercial trial in Guangzhou, Huizhou and Zhaoqing.

In September 2005, by the end of July 2005, the number of PHS users in Chinese mainland reached 8,654,380+275,000.

By the end of August 2006, the number of PHS users in Chinese mainland reached 93 million. Overseas PHS users exceed 7 million. The number of PHS users in the world has exceeded 1 100 million.

In June 2006, 5438+ 10, the number of PHS users in Chinese mainland reached the historical peak of 934 1 10,000.

In June 2007, UT Starcom's board of directors removed Wu Ying from the post of president. It marks the change of UT Starcom's attitude towards PHS.

In August 2007, PHS terminal chargers and interfaces also began to implement new unified standards, and PHS chargers will be interoperable with mobile phones.

In June, 2007, 5438+065438+ 10, the Ministry of Information Industry of China revealed that the number of PHS users decreased significantly, and in June, 5438+00, the number of PHS users decreased by 2.5 million.

In March 2008, mobile phone users sent short messages to PHS users, and the prefix 106 was cancelled.

In May 2008, the number of PHS users in Chinese mainland has fallen below 80 million, and the defense line of PHS has collapsed in the straight downward adjustment of mobile tariffs.

In June, 2008, 5438+ 10, Xie Feibo, deputy director of the Radio Administration Bureau of the Ministry of Industry and Information Technology, said that the 1900- 1920MHz frequency band used by PHS will be used in TD-SCDMA in the future.

On June 5438+ 10, 2009, when China Unicom announced its 2008 performance forecast, it revealed that PHS was included in the impaired assets.

In February 2009, according to the statistics of the Ministry of Industry and Information Technology, by the end of 2008, the number of PHS users in Chinese mainland had dropped to 6,89311,000, which fell below the 70 million mark.

On February 3, 2009, the Ministry of Industry and Information Technology issued a document, explicitly requiring all wireless access systems in the 1900 MHz- 1920 MHz band to clear their frequencies and withdraw from the network before the end of 20 1 1 to ensure that they are not in1880 MHz. China Telecom and China Unicom received the relevant documents from the Ministry of Industry and Information Technology, and will properly complete the delisting of PHS before 20 1 1. To ensure that it will not cause harmful interference to TD-SCDMA system in 1880- 1900MHz band.

In 20 10, PHS confirmed that it would be delisted on 20 1 1 to make way for 3G, the new favorite of communication.

20 14, from 201410/,the original PHS base station will be closed. PHS service is undertaken by more advanced mobile networks. PHS users should come to the designated business hall with their valid certificates or call 10000 before September 30, 20 14, and they can enjoy the corresponding upgrade discount.

PHS technology is actually a digital mobile communication technology, which belongs to the second generation communication technology. The coverage of PHS base station is limited and the distance between communication base station and terminal is short. Therefore, when the communication power used is small and the coverage area is large, more base stations are needed. This makes PHS more suitable for urban use, and its effect in the field is not good. In terms of the communication speed of the first generation of mobile phones, PHS belongs to the range of 2G. Its design also makes it a little delayed when talking (because of its small coverage area and small "honeycomb" area).

PHS uses TDMA/TDD as its wireless communication interface and 32K ADPCM as its voice transmission coding. Modern PHS mobile phones can also support some other ISP's value-added services, such as Internet narrowband communication, SMS, email and even photo communication.

PHS technology is also suitable for small-scale radio communication.

1995, originally operated by three Japanese telecom operators: NTT Personal, DDI Pocket and ASTEL. However, shortly after the service was launched, the technology was called "the honeycomb of the poor", which was greatly restricted in Japan and its market share gradually declined. Later, NTT Private Company was merged by NTT Docomo Company. In 2004, NTT DoCoMo decided to terminate PHS service in 2007. ASTEL is run by several regional companies, most of which have stopped serving.

However, in June, 20001year, DDI Pocket began to provide unlimited 32kbps Internet service Air-H ",which opened up new uses. In 2002, the maximum communication speed of Air-H "was increased to 128kbps. In 2005, most of the shares of DDI-Pocket were acquired by Carlyle, an American investment company. The company name was changed to Willcom, and the service name of Air-H was also changed to Air-Edge. Willcom started unlimited calling service and increased the maximum communication speed of Air-Edge to 256kbps. In 2006, it was upgraded to 402kbps again, exceeding the communication speed of WCDMA third-generation mobile phones. Now Willcom has restored the maximum number of customers that DDI Pocket can reach in the past.

Some countries that originally used PHS technology also began to switch to GSM, such as Chinese mainland and Chile. However, PHS technology is also very popular in some countries and regions with lower costs and more additional services, such as Taiwan Province Province, Thailand, Viet Nam, Bangladesh, Nigeria, Mali, Tanzania and Honduras. going green and environmental protection

PHS has low power consumption, minimal electromagnetic radiation and little radiation damage to human body, and is still loved by some special groups, such as the elderly, pregnant women and medical staff. Long standby power saving: PHS saves electricity and has long standby time. Once charged, the standby time can reach 10 day, which saves the trouble of frequent charging.

Exclusive bandwidth

Within the network coverage, the call quality of PHS can be comparable to that of fixed line; Unlike wireless Internet access by mobile phone, PHS can enjoy 64/ 128Kbps bandwidth exclusively.

Catch the user

PHS is a product of a special period, and it was also a helpless move that China Telecom and China Netcom didn't have a mobile license, but it also seized a large number of users for operators before 3G. Less function

PHS has few auxiliary functions. In the early days, it can only send short messages between PHS, and many fashionable new functions such as surfing the Internet and mobile games are also improved in the later period.

Low coverage rate

Poor network coverage, generally limited to urban areas, poor signal; There are few base stations, and calls in some parts of the city are not smooth, especially when there is power failure.

Poor performance

When the speed exceeds 40 kilometers, the call will be intermittent. Although Japan is constantly improving its technology, it has basically not developed at home.

No roaming.

PHS can't roam around the country like a mobile phone, but it can only be a supplement and extension of the fixed phone, and it always has a gap with the mobile phone in function.