KR100310029B1 - Internet access method and system for wireless multimedia communications - Google Patents

Abstract

The present invention relates to a next generation Internet access method and system capable of real time wireless multimedia communication as well as broadband data communication. The central control unit provides data downstream by accessing a database in the Internet network, or delivers data to a common Asynchronous Transfer Mode (ATM) switch to transfer data from a subscriber to another subscriber connected to the Internet. The base station wirelessly transmits data frames to be received downstream via a wired network or to be transferred from one subscriber to another subscriber to the central control unit. Data processing for communication service is also performed to subscribers in the base station cell. The subscriber station wirelessly provides data upstream to the base station so that the central control unit can access the database to provide downstream, and provide the downstream to the subscriber wirelessly. It also performs a transmission and reception function for communication between the subscriber connected to the central control unit and the Internet, and the subscriber connected to the base station. At this time, the base station and the subscriber station communicates in units of wireless ATM MPDU. As a result, it is possible to solve the service distance problem due to the limitation of the physical characteristics of the wired physical channel, and since there is no need for civil works, economical communication service and real time wireless communication are possible. In addition, it is possible to obtain price competitiveness that is superior to competitive technology, and to satisfy the requirements of next-generation Internet service, low service delay time, robustness, service quality, low identity, and billing service support.

Description

Internet access method and system for wireless multimedia communications

The present invention relates to an internet access method and system capable of wireless multimedia communication, and more particularly, information transmitted through an internet network and a common asynchronous transfer mode (ATM) network is asynchronous digital subscriber line (ADSL). Instead of being sent directly to the subscriber side via wired cable through a digital subscriber line (DSL) network or cable TV, such as universal ADSL (UDASL), unidirectional DSL (UDSL), or very high bitrate DSL (VDSL). In the Internet access method for wireless multimedia communication by converting the information transmitted by wire to ATM cell type of ATM mode and then to the MPDU (Mac Packet Data Unit) for wireless transmission of the information to the subscriber side; It is about the system. In addition, when accessing from the subscriber side, after converting the data into MPDU through the subscriber terminal or subscriber access equipment, the data is transmitted to the base station, and the base station transmits the data in units of MPDU to other subscribers or the equipment of the central office (CO) side. It connects through and transmits to other subscribers connected through public network.

Since the 1990s, there has been an increase in demand for Internet services worldwide. As a result, the Internet is currently experiencing severe congestion. However, due to the lack of technical methods of providing high-speed Internet service at economic cost, the problem of Internet congestion has not been solved yet.

In recent years, a major concern in establishing high-speed telecommunications networks for most network service providers, telephone companies and subscriber network operators has been to provide subscribers with cheaper and more efficient use of the Internet. Therefore, the biggest problem was whether the most economical information and communication network can be provided while providing Internet services and comprehensive multimedia services in the future.

Currently, individuals, businesses and organizations are receiving T1 (1.5 Mbps) and E1 (2 Mbps) services to use Internet services. For T1 service, you will have to pay around 3000 [$ / Month] to get service in the United States. The situation is similar in Korea. Therefore, these costs are difficult for individuals to pay. And you have to wait about a month to receive this service. This is because installation time is required. Of course, leased line services are only leased lines, so Q.o.S and billing over service hours are not supported at all. In conclusion, the current Internet leased line service is a barrier for the general public to easily access the Internet due to problems such as expensive service price and long installation time.

Until recently, the national policy in most high-speed telecommunications network constructions was Fiber to the home (FTTH), which embeds fiber optics all over the house. This policy, however, is so expensive that the cost of building a subscriber access network is more than 70% of the total high-speed telecommunications network, leading to the challenge of finding other economic solutions.

Asynchronous Subscriber Line (ADSL), developed by Bellcore in 1988 for video on demand, has been proposed as an economical solution to the construction of high speed telecommunication networks with the explosive growth of the Internet. Companies such as Alcatel, Texas Instruments (TI) and Motorola are known to focus on developing modems and equipment for ADSL. Already, most countries, including the United States, are piloting ADSL in specific regions. ADSL has 8 Mbps of downstream bandwidth available to date, and most companies are provided with high-cost, cost-effective lease of T1 (1.544 Mbps) / E1 (2.048 Mbps) for the Internet and intranet. Given that the bandwidth and cost seem to be an economic solution to some extent. However, ADSL is asymmetrical downstream and upstream, making it impossible to provide 8Mbps bandwidth up / down. Until now, in ADSL technology, when the bandwidth of upstream and downstream is about 1Mbps, network service provider can only provide symmetrical service to subscribers within 1km radius of central office (CO). There is a limit. In addition, ADSL uses a common twisted copper telephone line, which causes a drastic drop in bandwidth over distance. In addition, when a plurality of users are connected to the ADSL wired service through an ADSL router at the end subscriber side, since a plurality of subscribers are connected to the same ADSL, the service time for each subscriber is not required by a separate software method. There is a disadvantage in that it is difficult to collect the bills and it is difficult to satisfy the quality of service (QoS). DSL (ADSL, UADSL, UDSL, VDSL, etc.) using existing copper telephone lines, such as ADSL, is basically one of the most serious disadvantages.

In addition, in addition to the existing DSL scheme using a telephone line, a method of serving a subscriber through a high-speed network using a cable network of CATV has been attempted. Because of the better physical channel characteristics than public telephone lines, the distance limitation problem is relatively free. However, unlike ordinary telephone lines, the cable is not supplied to all users, so there is a problem in that a new cable has to be installed. Therefore, there is a problem that the service is available only in the area where the network is installed. At the same time, DSL completely allocates one line to the user, so even if the number of users increases based on the CO side, the bandwidth is not gradually reduced, but until now, in the case of a high-speed information network using a CATV network, the bitrate decreases as the number of users increases. Has weaknesses Therefore, it is not suitable for the next generation internet multimedia communication requiring real time and fixed bit rate service.

The technical problem to be solved by the present invention is to solve the problem of service distance of subscriber network, service system installation speed problem, broadband service problem, QoS service problem, etc. which are disadvantages of the prior art as described above. The present invention provides an internet access method and system capable of providing wireless multimedia communication by supporting QoS while providing an economical high-speed information communication network to corporate and home subscribers.

1 is a view schematically showing a conventional Internet access method and system.

2 is a system diagram illustrating a schematic system for explaining an internet access method for wireless multimedia communication according to the present invention.

3 is a conversion diagram of a transmission frame when a service is provided to the system according to the present invention.

4 is a flowchart illustrating an internet access method for wireless multimedia communication according to the present invention.

FIG. 5 is a flowchart illustrating in more detail the steps for wireless transmission of FIG. 4.

6 is a diagram showing the structure of a typical transmission frame when providing an ATM service over the air.

7 is a diagram illustrating a conversion structure of a data transmission frame.

<Explanation of symbols for the main parts of the drawings>

15 ... ATM switch, 20 ... central control unit

22 Digital subscriber line, 25 base station

30 Subscriber terminal, 35 Subscriber access adapter

The present invention provides a data downstream by accessing a database storing data in the Internet network under the control of the information manager in order to achieve the above technical problem; Providing the data downstream to a base station via a wired network; and wirelessly transmitting data upstream to the base station by a subscriber to access a database of the internet network to provide data downstream. It provides a method for accessing the Internet for wireless multimedia communication comprising the step of wirelessly receiving the stream to the subscriber.

Preferably, the Internet access method of the present invention is characterized in that the subscriber further comprises the step of exchanging data with another subscriber connected to the central control unit via the base station.

In addition, the Internet access method of the present invention is characterized in that the subscriber further comprises the step of performing data communication, including wireless multimedia communication between other subscribers connected to the same base station.

The present invention, in order to achieve the above technical problem, a central control unit for providing data downstream by relaying to access a database storing data in the Internet network under the control of the information manager; A base station receiving data downstream from the central control unit via a wired network; and providing data upstream wirelessly to the base station to provide a data downstream by accessing a database of the internet network through the central control unit, and transmitting from the base station. And a subscriber station for wirelessly receiving the received data downstream and providing the subscriber to the wireless device.

Preferably, the base station allows the subscriber to exchange data with other subscribers connected to the central control unit through the base station.

Preferably, the base station is characterized in that the subscriber to the data communication, including wireless multimedia communication between other subscribers connected to the same base station.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the Internet access method and system for wireless multimedia communication according to the preferred embodiments of the present invention will be described in more detail.

Prior to describing the Internet access method and system for wireless multimedia communication of the present invention, a brief description will be made of the existing Internet access technology in order to understand the present invention.

U.S. Patent 5,756,280 (May 26, 1998) discloses a technology for a multimedia supply chain. It consists of one or more servers that access each database for storing multimedia information in order to provide the subscriber with the multimedia information. Each server is connected to an asynchronous transmission mode (ATM) packet switching network, and the ATM packet switching network is connected to a plurality of switching points. This switching point receives digital information from the ATM packet switching network and provides one or more multimedia information streams to the modem via a coaxial switching network under the administrator's control, which is a conventional transmission medium such as a telephone line using ADSL. It is connected to the subscriber terminal via. As a result, subscribers can access a plurality of database servers through ADSL, but it is difficult to solve the above-mentioned problems because it is a technology that can be connected by wire, such as ADSL between information providers, network operators and subscribers.

In addition, U.S. Patent No. 5,790,548 (August 11, 1998) relates to Internet information access technology, which includes public switched telecommunications using ADSL between an Internet service / information provider connected to a telephone company and a subscriber terminal. Providing Internet access via a network (PSTN), which leads to wired connection from an Internet service / information provider to a subscriber terminal, does not solve the above-mentioned conventional problems.

The conventional Internet access solution will be described with reference to FIG. 1, whereby subscribers 3 of the home and the enterprise through the ADSL 2 from an intermediary 1 such as an internet service / information provider or a telecommunications company. In this case, since the installation cost is increased from the intermediary 1 to each subscriber station in addition to the installation cost increase, when a large number of users are WAN-connected through the ADSL through an ADSL router or the like, There is a problem that it is difficult to automate billing because it is difficult to identify the source and destination of the information, and there is a problem that the transmission distance is shortened in inverse proportion to the amount of data transmission due to the characteristics of ADSL, and there is a problem that it is difficult to manage the quality of service. .

2 illustrates a system for performing an internet access method for wireless multimedia communication according to the present invention. 2, the network operator's central control unit 20 provides multimedia information through an ATM switch 15 from an Internet service / information provider (not shown) that provides one or more databases for storing data such as multimedia information connected thereto. The downstream and data downstream are received and provided to the base station 25 through a wired network 22 such as a DSL or CATV cable. Alternatively, the central controller transmits the data received from the base station to an internet service provider and a user connected thereto. In this case, the central control unit 20 and each base station 25 is provided with a wired modem (not shown) for transmitting and receiving the downstream and upstream. In this way, the base station 25 receives the received downstream data to the subscriber station 30 through a wireless modem (not shown) provided in the base station 25 and transmits the data received from the subscriber to the frame according to the wired channel characteristic connected to the central control unit. To send data. At the same time, if a subscriber connected to the base station directly transmits data to another subscriber, it converts it into an MPDU and transmits it to the receiving subscriber. Similarly, the subscriber terminal 30 is provided with a radio modem (not shown) for transmitting and receiving data from the base station 25. The wired modem and the wireless modem also serve to transmit an upstream information stream from the subscriber station 30 to the base station 25 or from the base station 25 to the central controller 20. The base station 25 and the subscriber station 30 may be configured as a general personal computer, or may be made in a rack form, such as a general large exchange or a base station for cellular communication. The subscriber terminal 30 is connected to a terminal 30, such as a personal computer at home, or is connected to a personal computer which is a corporate subscriber terminal 30 through a subscriber access adapter 35. In this case, a local area network (LAN) that is connected and integrated with a plurality of subscribers may be connected to the subscriber terminal 30 or may be directly connected through a user ATM switch or a user ATM network interface card (NIC).

The technology for accessing the Internet using a wired modem over the wires of the DSL and CATV networks is one of subscriber network service technologies for solving the cost problem of directly serving a home by FTTH. In other words, the backbone network is connected to the public ATM in any case. Therefore, whether to design a transmission frame using DSL technology using a physical layer as a telephone line or a transmission frame by configuring a physical layer with a CATV cable, the inside of the transmission frame is composed of ATM cells originally transmitted from a public ATM network. Therefore, if the subscriber side solves the transmission frame for wired subscriber network, an ATM cell can be obtained. Alternatively, a transmission frame may be decompressed and converted into an ATM cell.

FIG. 3 is a diagram illustrating conversion of a transmission frame in the present technology, and FIG. 4 is a diagram illustrating a step of switching a transmission frame until serving a subscriber.

3 and 4 will be described with reference to FIG. In the Internet access technology for wireless multimedia communication of the present invention, in step 40, the central control unit 20 receives the ATM cell 32 from the wired ATM switch 15, and in step 41, the central control unit 20 receives the received ATM cell. Converted to a wired transmission frame 34 and transmitted to the base station 25 through the DSL (22). In step 42, the base station 25 receives a transmission frame through a wired network 22 such as a DSL. The base station 25 receives the wired transmission frame and converts it to an ATM cell again (step 43). In addition, the base station 25 converts the converted ATM cell into an MPDU (MAC protocol data unit) 36, which is a radio transmission frame, so as to wirelessly transmit the converted ATM cell (step 44). Thereafter, the base station 25 transmits the MPDU to the subscriber network through the wireless modem (step 45). The subscriber station 30 converts the MPDU wirelessly transmitted through the subscriber network into an ATM cell again as shown in 38 in section 4 of FIG. 3 to directly receive an ATM cell (step 46), or use an Ethernet frame, an ATM or The service is converted into a subscriber transport frame such as a subscriber RF network MPDU and received (step 47).

In the present invention, receiving a wired transmission frame from a base station employing a wired network service such as DSL or CATV, restores it to an original ATM cell, converts it back to a MPDU (Mac Protocol Data Unit) for wireless ATM, and converts the wireless modem into a wireless modem. It is to implement ATM service by transmitting to subscriber. Or by receiving the services of the wired T1, E1, T3 converted to ATM cell form, and provides a wireless ATM service subscribers can easily access the Internet and provide a QoS capable ATM service.

FIG. 5 is a flowchart illustrating a step of releasing and transmitting a transmission frame for a subscriber network such as a DSL over the air to implement an ATM service over the air. Referring to FIG. 5, in step 52, a transmission frame transmitted by wire is converted into an ATM cell by a base station and a peripheral module. Then, the received ATM cell is converted into a DLC protocol data unit (PDU) through a data link control (DLC) layer (step 54). The packet is then received from the DLC layer and converted into an MPDU (step 56). The base station transmits the MPDU to the subscriber network through the wireless modem (step 58).

4 and 5 illustrate only the downstream conversion of data from the base station to the subscriber, but the upstream conversion of data from the subscriber side to the base station needs to be processed through the reverse process in the downstream case. Is omitted.

6 is a structure of a typical transmission frame when providing an ATM service over the air. In addition, FIG. 7 shows a transformation structure of a data transmission frame. 6 and 7, the structure of the transmission frame applied to the present invention is a WDLC cell by adding a wireless data link control (WDLC) overhead to the ATM cell 60 (62), the WDLC cell is a single slot After configuring a plurality of slots to add the physical overhead to make the MPDU (64). The transmission frame 68 of the present invention is configured by adding a frame header to a forward slot and a reverse slot having a plurality of MPDUs thus made. The control slot is configured at the end of the reverse slot.

The bidirectional service is possible through this structure because the ATM has a structure that can adaptively serve below the ATM layer. Therefore, in the present invention, it is assumed that the transmission frame is made from the ATM cell of the DSL modem or the CATV modem, and then decommissioned by the base station on the receiving side, converted back to the ATM cell, and then converted into a transmission frame for wireless transmission, thereby providing a DSL. Or, it is designed to accept the advantages of the service using the CATV modem as it is and to use the service advantages of providing the service wirelessly.

The transmission frame structure of the present invention may be applied to perform a wireless ATM communication service and a wireless data communication service. Configuration and operation thereof will be apparent to those skilled in the art, so detailed description thereof will be omitted.

Therefore, when providing the Internet access service to the subscriber by using the present invention it accepts the service advantages of ATM as it is. Therefore, when the Internet access method is implemented by the technology of the present invention, as in the wired ATM service, the base station can manage the service contract for each channel and calculate the charge for the usage fee according to the service use time and quality.

By providing the service wirelessly to the subscriber, it is possible to solve the problem of service distance, network installation work if wired. Thus, whether the wired network is not installed or the wired network is already installed, the service installation speed of the leased line service can be solved. Service infrastructure can be constructed at low cost because there is no separate civil engineering work. The frequency can be selected using 2.4 [GHz], one of the Industrial, Scientific and Medical (ISM) bands, or 5 [GHz] bands, which are U-NII (Unlicensed National Information Infrastructure) bands released by the US FCC, and using directional antennas. In this case, the service distance can be extended to about 40 [km].

At the same time, if a user-configured connection is provided by a base station and a user is provided with a service according to the Q.o.S (Quality of Service) function of an ATM, a robust service can be provided according to a service contract.

Whatever the rate of the transmission frame of the wired end service in front of the base station, it is changed back to the ATM cell and then provided with the service, so that the user can be recombined with the desired speed to provide the service. In other words, if you request broadband service, you can provide the service accordingly. At the same time, it is also possible to provide more services than the bandwidth inputted to the base station according to the characteristics of the subscriber service using the ATM's unique statistical multiplexing function.

It is connected to the ATM backbone through DSL and CATV modem services, which are relatively inexpensive high-speed subscriber network services, so that it can be provided at a relatively low cost.

The Internet access method and system for wireless multimedia communication of the present invention can be used to provide services such as World Cup relaying, and in this case, at a low cost, the World Cup and other sports event relaying images and player personal information and members through the Internet. Numerous application services based on multimedia communication technology can be provided, such as providing win rate calculation information according to configuration. For example, it can be used as a communication infrastructure that can select and view private broadcast broadcasts through the Internet while communicating with neighboring remote countries, or can exchange information interactively.

As described above, the features of the Internet access method and system for wireless multimedia communication of the present invention are as follows.

Since the present invention does not require wired connection construction such as ADSL to subscribers, it is cost competitive. In particular, since there is no need to install a leased line, the cost of leased line service is greatly reduced. In addition, when the radio frequency such as ISM band or U-NII is properly selected, the service distance can be extended up to 5-40 km depending on the transmission capacity, thereby solving the problem of distance limitation and economical Internet service. The area of service that can provide services by solving the street problem is very wide, and the cost of service provider investment is less than 1/10 of other competitive technologies. In addition, there is no separate network installation cost, and both service providers and subscribers can use existing access equipment. It is possible to adjust the quality of service for each subscriber and to calculate and charge a fee based on the service time. In addition, the service equipment installation period is greatly reduced. In particular, the continental countries such as the United States and China are far from the central control unit, and the investment is expensive to receive the service. In this regard, the present invention is an economical solution, and the number of assumptions requiring high-speed information and communication services will increase in the next few years, resulting in full-scale ADSL and DSL demand. The present invention provides a dedicated line service, 1.548 / 2.048Mbps, ISDN-BRI (Integrated Service Digital Network0 Basic Rate Interface), analog modem (56kbps), B-WLL (Broadband Wireless Local Loop) and IMT-2000 (International Mobile Telecommunication-2000) Superior price competitiveness compared to competing technologies, including low latency, robustness, quality of service, and low latency, which are next-generation Internet service requirements It is a service that can meet the requirements of congestion, charging mechanism, etc., so it is a good solution and solves the problem of distance in ADSL and ISDN at low cost.

Claims (22)

Providing data downstream by accessing a database storing data in the Internet network by the subscriber's data upstream ; Providing the data downstream to a base station via a wired network; And Between the subscriber and the base station, before transmitting the data upstream and data downstream wirelessly, converts a transmission frame of data into an ATM cell, and converts the ATM cell into a DLC PDU through a data link control (DLC) layer. converting the packet to a protocol data unit, receiving the packet from the DLC layer, converting the packet into a MPDU (Mac protocol data unit), and transmitting the packet wirelessly; Internet access method for wireless multimedia communication comprising a. 10. The method of claim 1, further comprising a subscriber communicating data with another subscriber connected to the central control unit through a base station. 3. The method of claim 2, further comprising the step of subscribers performing data communications, including wireless multimedia communications, between other subscribers connected to the same base station. The method of claim 1, wherein the wired network is an ADSL, UADSL, UDSL, VDSL, or CATV cable. The method of claim 4, wherein the transmission frame uses an ISM band or a U-NII band as a frequency band. The method of claim 4, wherein wireless ATM communication is performed using the transmission frame structure. 7. The method of claim 6, wherein the base station directly receives a general leased line service, converts it back into an ATM cell, and wirelessly provides an ATM cell to a subscriber. 7. The method of claim 6, wherein the base station supplies the subscriber with more bandwidth than the bandwidth input by using the statistical multiplexing function of the wireless ATM. 7. The method of claim 6, wherein the subscriber determines a transmission rate and a cell delay parameter according to a desired quality of service by reconfiguring the service in units of ATM cells separately from the speed of the wired transmission network. How to access the Internet. 7. The method of claim 6, wherein the subscriber station connected to the base station or to the base station via wireless ATM provides VOD multimedia services to other subscribers. 4. The method of claim 3, wherein a wireless data communication service is performed using the transmission frame structure. A central control unit for providing data downstream by relaying the data upstream from the subscriber terminal to access a database storing data in the Internet network; A base station which receives data downstream from the central control unit through a wired network; And And a subscriber station providing the data upstream wirelessly to the base station, and wirelessly receiving the transmitted data downstream to the subscriber so that the central control unit accesses a database of the internet network and provides data downstream. , Before transmitting the data upstream and data downstream wirelessly between the subscriber station and the base station, converts the transmission frame of data into an ATM cell, and the DLC through the data link control (DLC) layer DLC Converting into a PDU (protocol data unit), and receives the packet from the DLC layer converts into a MPDU (Mac protocol data unit) and transmits over the air for wireless multimedia communication, characterized in that. The Internet access system of claim 12, wherein the base station enables a subscriber to exchange data with another subscriber connected to the central control unit through the base station. 13. The Internet access system of claim 12, wherein the base station enables a subscriber to perform data communication including wireless multimedia communication between other subscribers connected to the same base station. The Internet access system according to any one of claims 12 to 14, wherein the wired network is an ADSL, UADSL, UDSL, VDSL, or CATV cable. The Internet access system according to any one of claims 12 to 14, wherein the transmission frame uses an ISM band or a U-NII band as a frequency band. 15. The Internet access system according to any one of claims 12 to 14, wherein wireless ATM communication is performed with the transmission frame structure. 18. The Internet access system of claim 17, wherein the base station directly receives a general leased line service, converts it back into an ATM cell, and wirelessly provides an ATM cell to a subscriber. 18. The Internet access system of claim 17, wherein the base station supplies the subscriber with more bandwidth than the input bandwidth by using the statistical multiplexing function of the wireless ATM. 18. The method of claim 17, wherein the base station determines a transmission rate and a cell delay parameter according to a desired quality of service by reconfiguring the service in units of ATM cells separately from the speed of the wired transmission network. Internet access system. 18. The Internet access system of claim 17, wherein a subscriber station connected to the base station or to the base station by wireless ATM provides VOD multimedia services to other subscribers. The Internet access system according to claim 12, wherein a wireless data communication service is performed using the transmission frame structure.