CN1336599A - Asymmetrical widebant internet access system and method - Google Patents

Abstract

The invention discloses a switch in system and method utilized in asymmetric broad band Internet. It includes client terminal, ISP, cable television station. The information of client terminal is transferred to ISP through PSTN. The information gotten from Internet is transferred to client terminal by cable television station through HFC network. There is an asymmetric switch in route server installed in ISP. There is an asymmetric switch in Internet server installed in cable television station. The Internet service provider and the cable television station are connected through communication media. The invention makes the cable television station possibility not to purchase new switch in Internet facility. The invented system and method provides the features of simple structure and low cost.

Description

A kind of asymmetrical broadband the Internet connecting system and method

The present invention relates to a kind of cut-in method of network, particularly a kind of cut-in method that utilizes existing Public Switched Telephone Network and one-way optical fiber/coaxial cable hybrid network (HFC) to realize asymmetrical broadband the Internet.

Develop rapidly along with computer networking technology, the Internet penetrates into people's life day by day as maximum internet, the whole world, people not only can realize telecommunication by the Internet, browse, read, gather information, all right music appreciating, film, carry out online shopping etc., greatly satisfied people's spirit and material requisite.But simultaneously, the online dialing is difficult, and transmission speed reaches problem such as drop rate height slowly and makes the access of the Internet become to perplex people all the time and further develop one of major issue of internet resource.

Ripe at present the Internet access way comprises three kinds: 1, ordinary telephone line dials up on the telephone; 2, the ISDN special line dials up on the telephone; 3, cable modem (Cable Modem) online, their implementation is as follows:

1, telephone wire dials up on the telephone

Telephone wire dials up on the telephone is to utilize existing public switched telephone network (PSTN) PSTN, is connected by twisted-pair feeder and service system are long-range, thereby enters into the Internet, and its access way as shown in Figure 1.This is the network access that present most of domestic consumer adopts, and PSTN is all passed through in the downlink transfer of information and up passback.The characteristics of this mode are the access technology maturations, but belong to arrowband Netcom letter, maximum transmission rate can only reach 56K, but also to take a telephone line, promptly surf the Net and make a phone call and to carry out simultaneously, if access the Internet not at short notice is also unsuitable off line, otherwise need login again, and login time is longer.

2, the ISDN special line dials up on the telephone

ISDN claims ISDN (Integrated Service Digital Network) again, promptly by a network, only needs a terminal, a number, and the user just can unify to handle such as multiple business such as phone, fax, data communication, videotexts.At present, it is exactly access the Internet that ISDN one of uses the most widely, and its access way as shown in Figure 2.ISDN uses standardized user interface, and as basic rate interface, it comprises the truck of two 64kbps and the signaling channel of a 16kbps, i.e. 2B+D is so can provide multiple business.When adopting ISDN to enter the Internet, transfer rate can reach 128kbps, and dials up on the telephone and will stablize with respect to telephone wire.

ISDN has solved some problems that telephone wire dials up on the telephone and exists,, connection instability low as transfer rate, and can in the transmission data, converse, can also support multiple business, but at present domestic ISDN special line is still realized communication by the PSTN net, for the bigger file of transfer ratio, as voice, image, and transfer rate such as software download still can not satisfy customer requirements.In addition, ordinary telephone line online and ISDN Internet access via leased-line all are subjected to the restriction of self information processing power, restriction as local breakout, often do not reach desirable transfer rate 56kbps or 128kbps, so though though the ISDN special line than ordinary telephone line advanced person, does not fundamentally solve the problem of transfer rate.

3, cable modem online

The cable modem online is a kind of new the Internet access way of rising rapidly along with the continuous development of CATV (cable television) broad band Integrated service net (CATV) in recent years, and it can realize the access of broadband the Internet, and connected mode as shown in Figure 3.The characteristics of this access way are to utilize broadband networks communication, the development trend that meets following computer network, telecommunications network, wired network unification of three nets, band resource is abundant, transfer rate is fast, maximum can reach 10Mbps, can carry out multiple business such as phone, TV programme, video conferencing, videophone, shopping online, web-based teaching on the net simultaneously at one.But cable modem must operate at two-way HFC net, and at present except that the only a few experimental plot, the HFC net in domestic overwhelming majority area all is a unidirectional network, and if carry out the technical equipment transformation on the net at existing unidirectional HFC, make two-way net into, then investment is too huge, can not finish in three, five years, so the cable modem online can't be popularized at short notice.

Therefore people consider cut-in method that above-mentioned various access waies are combined, so that solve the deficiency that various access waies exist.In the asymmetric the Internet cut-in method that occurs, having a kind of is to utilize cable TV station as ISP (ISP) at present, and as shown in Figure 4, the user inserts by this cable TV station and the Internet.Comprise following equipment in the cable TV station: modulator-demodular unit, router, Cache Cache, multiplexer, Internet server, the Internet access device, modem bank etc.They connect by LAN (Local Area Network) to each other.This cut-in method under the breath of delivering a letter, utilize the HFC net, and utilize the PSTN net for back information.Breath and back information all will be brought in realization by cable TV station owing to deliver a letter down, not only must newly purchase the Internet access device for cable TV station like this, also must guarantee each access link, as the application number source, build junction line, charge system or the like.In addition, also there are being various restrictions in various places cable TV station aspect the policy when carrying out the Internet access agency service.Because more than, really implement above-mentioned asymmetric the Internet cut-in method and also have certain difficulty.

The objective of the invention is in order to overcome the defective in the above-mentioned existing asymmetric the Internet cut-in method, a kind of asymmetric broadband the Internet cut-in method that utilizes existing Public Switched Telephone Network and unidirectional HFC net is provided.The method needn't be purchased new the Internet access device at the CATV (cable television) you, for example junction line, charge system etc., and therefore simple in structure, cost is lower.

The present invention is achieved by the following technical solutions: asymmetrical broadband the Internet connecting system of the present invention, comprise: client terminal, the ISP, cable TV station, the information of this client terminal sends the ISP to by public switched telephone network (PSTN), and the information that this cable TV station will obtain from the Internet by one-way optical fiber/coaxial cable hybrid network sends client terminal to, it is characterized in that, also comprise an asymmetric access routing server that is positioned in the ISP, with an asymmetric access server that is positioned in the cable TV station; Described ISP is connected by communication media with cable TV station.

The present invention also provides a kind of cut-in method that is used for the Internet of asymmetrical broadband the Internet connecting system, this system comprises: client terminal, the ISP, cable TV station, the information of this client terminal sends the ISP to by public switched telephone network (PSTN), and this cable TV station sends information to client terminal by one-way optical fiber/coaxial cable hybrid network, it is characterized in that, at client terminal, the ISP, before the CATV (cable television) interstation transmits information data, earlier information data is broken into and comprise the client terminal address, the server address that client terminal requires, and the asymmetric the Internet of Service-Port address entries purpose access protocol bag, so that carry out Route Selection, and user request information is managed.

The present invention is further illustrated below in conjunction with drawings and Examples.

Fig. 1 is the existing synoptic diagram that utilizes the access way of public switched telephone network (PSTN) online;

Fig. 2 is the existing access way synoptic diagram that utilizes the ISDN (Integrated Service Digital Network) online;

Fig. 3 is the existing access way synoptic diagram that utilizes the cable modem online;

Fig. 4 is the existing mode synoptic diagram that utilizes the asymmetric access of public switched telephone network (PSTN) and the online net of HFC;

Fig. 5 is the synoptic diagram of asymmetric broadband the Internet connecting system of the present invention;

Fig. 6 is the synoptic diagram of concrete structure of the connecting system of Fig. 5;

Fig. 7 is the form of asymmetric the Internet access protocol of the present invention (SBAIAP) bag;

Fig. 8 is the processing procedure that client terminal of the present invention sends solicited message;

Fig. 9 is an ISP's of the present invention information process;

Figure 10 is the information process of cable TV station of the present invention;

Figure 11 is the process that client terminal of the present invention receives the CATV (cable television) station information.

Asymmetric access way of the present invention as shown in Figure 5 and Figure 6.As can be seen from Figure 5, ISP one end is with after the Internet is connected, the information that the receiving terminal user uploads by PSTN, and be connected with cable TV station by special line, cable TV station passes to the terminal user by HFC with under the information.Here, because mostly user's back information is instructions such as some HTTP, POP3, SMTP, volume of transmitted data seldom, so adopt common telephone network, by the arbitrary ISP ISP in this locality, by the asymmetric access routing server identifying user identity of ISP ISP end, and packet is transmitted to cable TV station.At the CATV (cable television) you, the packet of being received by parsing according to user's solicited message or directly call from Cache, is perhaps downloaded from the Internet by ISP, and, pass to the user by unidirectional HFC net as the transmission of sound, image, software download etc. with a large amount of following breaths of delivering a letter.Adopt this method need not build new net, existing equipment also be need not to carry out large-scale redevelopment, and can reach and connect stable, transfer rate fast (maximum can reach 10Mbps), rationally utilize purposes such as band resource.If the user finds the low-cost ISP of a family in this locality, then the user can also be by adopting system and method for the present invention, spend the expense of ordinary telephone line online and enjoy broadband the Internet access service at a high speed, thereby obtain overflowing service.

Be example by ISP ISP online now, the concrete structure of specific implementation this asymmetrical broadband the Internet access way of the present invention is described with the user.

As shown in Figure 6, this connecting system comprises subscriber unit, ISP ISP unit, cable TV station unit etc.Wherein, the cable TV station unit comprises: router, modulator-demodular unit, high-speed buffer, multiplexer.These parts all are that existing CATV (cable television) unit has.In addition, different with existing cable TV station is also to be provided with an asymmetric access server.This asymmetric access server is connected with above-mentioned each parts by LAN (Local Area Network), be used for and the following ISP unit that will mention in asymmetric access routing server between communicate, receive data from the asymmetric access routing server in the ISP unit.ISP ISP unit comprises: router, modulator-demodular unit, server, internet switch-on server, modem bank.Modem bank is connected with the user by PSTN.Itself and existing ISP unit difference are, also are provided with an asymmetric access routing server.By private line access, also can connect between cable TV station and ISP unit by other transmission medium.Make and to communicate between the server of the server of cable TV station and ISP unit.And subscriber unit comprises: display devices such as user terminal, computing machine or TV.Describe its course of work below in detail.

One, subscriber terminal service request process

(1) user's account number of using ISP ISP to provide dials;

(2) after the modem links success, the user opens local browser, and the network address that enters is wanted in input, enters homepage, otherwise will continue to dial, up to linking successfully;

(3) user is by homepage login username and password, in the legitimacy of the asymmetric access routing server inspection user at ISP ISP place.Have only the validated user of registration just can enjoy this access service;

(4) after the user logins success, propose various services request,, send and receive e-mail as browsing page, downloaded software etc., existing is the implementation procedure that example describes services request in detail with the browsing page, all the other are similarly;

(5) client terminal breaks into a kind of asymmetric the Internet access protocol bag with the http protocol that browsing page adopted that the user proposes, i.e. SBAIAP protocol package, this process be for ensure information security, transmission reliably, will be described below about the SBAIAP bag;

(6) client terminal breaks into the UDP bag with the SBAIAP bag, breaks into the IP bag again, gives the Internet server at ISP place by the PSTN net, and so far user terminal processes services request section processes finishes, and particular flow sheet as shown in Figure 8.Here, UDP bag and IP bag are respectively agreements of transport layer and network layer, and it is needs in order to transmit that data are broken into that UDP bag and IP wrap, owing to they all are known technologies, so repeat no more.

Two, the processing procedure of the asymmetric access routing server of ISP ISP end

(1) asymmetric access routing server is resolved after receiving the IP bag that user side sends, and obtains the UDP bag, is resolved by the UDP bag again, obtains the SBAIAP bag;

(2) whether asymmetric access routing server check SBAIAP bag is legal, if the legal asymmetric access server that will be transmitted to the CATV (cable television) you is illegal otherwise will express this services request.The E1 special line communication that is 2M by a bandwidth between ISP and the wired TV station, it also can be the DDN special line, to guarantee high speed, high-efficiency information transmission between the two, asymmetric access routing server is in order to transmit, the SBAISP bag that obtains after resolving is broken into TCP bag and IP bag again, be sent to the asymmetric access server of CATV (cable television) you then, so far the processing procedure of ISP end finishes, and particular flow sheet as shown in Figure 9.Here, TCP bag and IP bag are respectively agreements of transport layer and network layer, and it is needs in order to transmit that data are broken into that TCP bag and IP wrap, owing to they all are known technologies, so repeat no more.

Three, the processing procedure of CATV (cable television) you

(1) the asymmetric access server of CATV (cable television) you is resolved after receiving the SBAISP bag, solves user's services request, as http protocol;

(2) asymmetric access server is searched corresponding html file according to http protocol from Cache.The Cache here is a kind of large storage facilities, and special software is installed, and can timing automatic inquire about the Internet, and a large number of users more interested website download is come, and can also constantly refresh.The internet gateway server mainly obtains information from Cache, have only minority in Cache, search less than the ISP end of passing through connect with corresponding server on the Internet, obtain from the Internet.When thousands of users propose services request simultaneously, can guarantee the rapid, efficient of processing procedure like this;

(3) asymmetric access server breaks into the SBAIAP bag with the html file, and then breaks into the UDP bag, breaks into the IP bag at last again;

(4) asymmetric access server is given multiplexer MUX with the IP bag;

(5) multiplexer adopts DOCSIS 1.1 (Data-Over-Cable-Service InterfaceSpecification) agreement, and the IP bag is broken into the MAC bag that suitable line modem communications is used.The DOCSIS agreement here is the agreement that the regulation cable modem inserts;

(6) multiplexer breaks into the packet of MPEG2 standard with the MAC bag, and converts transport stream to;

(7) multiplexer with the transport stream of this services request with other information by the HFC client terminal of passing to user side off the net, so far the processing procedure of CATV (cable television) you finishes, particular flow sheet as shown in figure 10;

Four, user terminal processes process

User terminal is received transport stream, through accordingly layer by layer the decoding, resolving, as shown in figure 11, realize that finally the user browses the webpage of oneself liking on the browser of this locality.

In said process, all are all transmitted by the PSTN net by the service request information that client terminal sends, and user side can be the ordinary telephone line dialing, also can be to dial by the ISDN special line; And all information major parts on the Internet obtain from the Cache of CATV (cable television) you, and minority sends cable TV station by ISP end to after directly downloading on the Internet, and the information that dual mode obtains is all passed to the user by cable TV station by HFC is off the net.The present invention is equally applicable to the independent management the Internet access service of following cable TV station.

The information of uploading that the client terminal data volume is less, as various services request, through the PSTN net, by being located at the asymmetric access routing server of local arbitrary ISP end, the legitimacy of identifying user identity, services request, and be transmitted to cable TV station; Forwarding information is received by cable TV station, by asymmetric access server analyzing and processing, perhaps from Cache, obtain relevant information, perhaps download from the Internet through the ISP end, the following breath of delivering a letter of these a large number of users requests, as multimedia page etc., will pass to the user through unidirectional HFC net from the CATV (cable television) you.Adopt above-mentioned broadband the Internet cut-in method, can utilize prior art equipment easily, particularly need not to carry out the megatechnics scrap build for cable TV station.And,, enjoy the broadband the Internet access service of transfer rate up to 10Mbps just can spend the expense of using the ordinary telephone line online if can find the low-cost ISP of a family in this locality for domestic consumer, enjoy the enjoyment of surfing on the net.

The asymmetric the Internet access protocol of being mentioned in said process (SBAIAP agreement) is based on the view of doing of application layer, this agreement is with various concrete agreements, as be used for the http protocol of browsing page, the POP3 agreement that is used to send and receive e-mail and smtp protocol etc., user profile, the unified SBAIAP that breaks into of elder generations such as source document wraps, and then carries out exchanges data by the packing of heterogeneous networks layer protocol.SBAIAP comprises multiple information such as the IP address, user's validity of user name, user cipher, application ID, client terminal, be applied to asymmetric the Internet provided by the present invention cut-in method, can realize user rs authentication, be convenient to Classification Management, Route Selection is provided, and has expanded function flexibly.

In this agreement, each packet by plurality of data to forming, middle with "; R n " separate, each data is to by data head and data volume two parts, length is variable, whole data packet format as shown in Figure 7:

Above-mentioned data are to mainly comprising following several types:

1, Time: showing the current time, is optional

2, Username: user name

3, Password: user cipher

4, ApplicationID: use ID number

5, SBA Address: show the client terminal address

6, Server Address: Web and Mail server address that explicit user requires only are present in the packets such as HTTP, POP3, SMTP

7, Server Port: showing Web and Mail server end slogan, is 80 as the HTTP serve port, and the POP3 serve port is 110, and the SMTP serve port is 25

8, Version: client terminal application version

9, Data Type: data type

10, DataSegment: show the beginning of data volume

11, User Vaild: show whether user identity is effectively, if the user is that effectively value is 1 otherwise is 0

The data type of SBAIAP bag mainly is divided into following several:

1, Login: show that this packet is to land packet

2, Logout: show that this SBA user withdraws from

3, LogACK: be used to judge user identity

4, CMD: undefined command packet is used for the future feature expansion, as power user's remotely modifying database

5, HTTP:HTTP packet

6, POP3:POP3 packet

7, SMTP:SMTP packet

8, other type

HTTP packet for example, form is as follows:

Time：2000-5-27；\r\nUsemame：Cachay?Roxus；\r\nPassword：******；\r\nData?Type：HTTP\r\n；User?Valid：1\r\n；Server?Address：www.263.net\r\n；Server?Port：80\r\n；SBA?Address：123.23.45.4\r\n；ApplicationID：21231\r\n；Version：1.1.1\r\n；Data?Segment：full?HTTP?protocoldata?packet

For safety, user cipher shows with ciphertext.

The SBAIAP agreement is mainly all application layer protocols a common carrier is provided, in asymmetric the Internet provided by the invention cut-in method, the services request that all users send and all will break into the SBAIAP bag earlier from a large amount of breaths of delivering a letter down that front end sends, and the internet gateway server of client terminal, the Internet server that is hosted in the ISP end, CATV (cable television) you all must support SBAIAP agreement.Adopt the benefit of SBAIAP agreement mainly to be:

(1) Internet server of ISP end confirms by user name in the checking SBAIAP bag and user password whether this SBAIAP bag is legal, and the walking along the street of going forward side by side is sent to cable TV station or return the user by selection;

(2) the SBAIAP bag that sends of all client terminals is resolved by the asymmetric Internet server of CATV (cable television) you, is convenient to the CATV (cable television) you user request information is carried out Classification Management.

(3) has expanded function flexibly.CMD in SBAIAP agreement bag is undefined order bag, is to reserve for utilizing in the future network to carry out new service item, can be in remotely modifying cable TV station client database as following some authorized user etc.

Claims (6)

1. asymmetrical broadband the Internet connecting system, comprise: client terminal, ISP, cable TV station, the information of this client terminal sends the ISP to by public switched telephone network (PSTN), and the information that this cable TV station will obtain from the Internet by one-way optical fiber/coaxial cable hybrid network sends client terminal to, it is characterized in that, also comprise an asymmetric access routing server and an asymmetric access server that is positioned in the cable TV station that is positioned in the ISP; Described ISP is connected by communication media with cable TV station.

2. system according to claim 1 is characterized in that, described communication media is the El special line, or the DNN special line.

3. system according to claim 1 is characterized in that, the described information that obtains from the Internet can be passed to client terminal by public switched telephone network (PSTN).

4. cut-in method that is used for the Internet of asymmetrical broadband the Internet connecting system, this system comprises: client terminal, the ISP, cable TV station, the information of this client terminal sends the ISP to by public switched telephone network (PSTN), and this cable TV station sends information to client terminal by one-way optical fiber/coaxial cable hybrid network, it is characterized in that, at client terminal, the ISP, before the CATV (cable television) interstation transmits information data, earlier information data is broken into and comprise the client terminal address, the server address that client terminal requires, and the asymmetric the Internet of Service-Port address entries purpose access protocol bag, so that carry out Route Selection, and user request information is managed.

5. cut-in method according to claim 4 is characterized in that, described asymmetric the Internet access protocol bag comprises that also client terminal user name, user cipher, user identity effectively identify, user's for confirmation legitimacy.

6. cut-in method according to claim 4 is characterized in that, client terminal breaks into the udp protocol bag, the IP protocol package that are suitable for transmitting after information data is broken into asymmetric access protocol bag again in the Internet; Asymmetric access routing server in the ISP is opened udp protocol bag, IP protocol package earlier when receiving information data, open described asymmetric the Internet access protocol bag again.

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