Zhu Long Double: satellite broadband services in China Application

Man / Good Double Dragon China Satellite Communications Corporation 1, China's broadband business development status and problems ¾ ¬ broadband services in China over recent years of unremitting efforts, has achieved considerable development ¬; according to data released by Ministry of Information Industry, the first quarter of 2005 alone, broadband Internet users to add 3.484 million, total number of 28.33 million.

  However, the development of broadband business in China and with South Korea and Japan in Asia than there is still a big gap in coverage.

View of the broadband business in the future of information technology in China and people in the important role of cultural life, taking into account the vast territory and complex topography and level of development between regions there are differences in the reality of it, so now Some resources, environment and social conditions, the development and popularization of broadband services in China, has become an important issue.

Broadband services currently restrict the development of our country there are two major problems in respect of the broadband business as a "last mile" of the CPN (Access Network) building, and second, broadband, QoS issues (such as bandwidth guarantees, the network reliability, availability, etc.).

In CPN's building, now our main means of broadband access FTTH (FTTH), cable TV, WiFi, WiMAX and ADSL, etc.. According to business development in recent years, the practice of terrestrial broadband, terrestrial broadband access to the biggest dilemma is: broadband network construction in the early need to invest huge amounts of money, but the network is completed, return on investment is difficult to determine, if the actual number of users than expected, lead to a lot of investment funds, "precipitation", which led to the investment risk to many investors stay away; So though all telecom operators and broadband providers are very positive about broadband access, but the mainstream of China's current broadband access technologies means they are not all optimistic about the fiber directly to homes, but relying on the traditional PSTN telephone network, a relatively small investment, low-risk ADSL technology (roughly the number of broadband access users 80%).

Theory, ADSL technology can provide users with the highest 8M downstream, 1M in the uplink, a new generation of the highest standard ADSL2 downstream rate up to 12Mbit / s; in good quality copper cable ¬ case, ADSL transmission distance about 5km or so, ADSL2 / 2 + support from close to the 7km; but in actual applications, ADSL users to enjoy the actual rates are subject to cable quality and length restrictions. In addition, ADSL has been guided by the network structure of PSTN voice services, ADSL is only solved the client to the DSLAM bandwidth relay network bottlenecks role allows the user to enjoy the actual bandwidth is limited. With ADSL is still not fully established quality and quantity according to the charging of fees, monthly fees means the system is still the mainstream, causing some users to take the opportunity to seize a large number of resources, forcing the operators had to restrict user speeds. As a result of the original ¬ present elsewhere in the country generally only ADSL transmission rate to maintain the 64k-1Mbit / s between, well below the support of IPTV and other broadband streaming media programming needs. At the same time, distance and line quality in poor circumstances, even the popularity of ADSL will be difficult. In fact, the family as the main users to "exchange bureau" as the opening size of ADSL, broadband access is only a transitional way. As a common means of Internet access to information query, the bandwidth of more than; and used to achieve MoD, VoD, NoD broadband content such as real, then obviously insufficient. Particularly because of the time, congestion occurs when the loop and other factors, the demand for high-end users will not be met.

Broadband access aspects of the investment risk and line quality issues, for the satellite to provide broadband access to business development opportunities.

2, restricting the development of satellite communication services for the original ¬ To explore the prospects for satellite broadband services, first need to analyze the competition in the telecommunications field in recent years in the satellite communications business development is limited because the original ¬.

2.1 cost disadvantage In recent years, as terrestrial services

bandwidth and capacity, QoS, user access, particularly to reduce the cost of continuous improvement, making it cost-effective rising; At the same time, satellite communications technology is relatively inadequate, particularly satellite high cost of long-term transponder, making satellite communications and terrestrial services than in many communications in a "Zhicijiagao" embarrassing situation and the resulting satellite communications market space by the following two conditions limit, namely:

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