WO2005104451A2

WO2005104451A2 - A method for ena~ ing the cdma system to support the ip facsimile service and a system thereof

Info

Publication number: WO2005104451A2
Application number: PCT/CN2005/000552
Authority: WO
Inventors: Zhen Zhong
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-04-21
Filing date: 2005-04-21
Publication date: 2005-11-03
Also published as: WO2005104451A3; CN100362844C; CN1691727A

Abstract

A method for enabling the CDMA system to support the IP facsimile service and a system thereof are provided, which relate to the CDMA system data transmission. The IP facsimile service supported by CDMA system can be implemented by adding the IP facsimile function to the CDMA system or user terminal, or by adding IP facsimile transmitting or receiving gateway to the CDMA system peripherally.

Description

Method and system for enabling code division multiple access system to support internet protocol fax service

The invention relates to the realization of data transmission in a code division multiple access system, and in particular to the realization of facsimile data transmission in a code division multiple access system. Background technique

Code Division Multiple Access ("CDMA") systems have large unit capacity, high communication quality, and are easy to upgrade to The Third Generation ("3G," for short) systems. Mobile communication systems are playing an increasingly important role. The current CDMA system basically deals with voice services. With the booming development of Internet services, simple calls can no longer meet user requirements. Many users It is hoped that the mobile communication system can provide more functions, such as being able to access the Internet through a mobile phone to query or send information, organize video conference calls, and perform remote diagnosis, etc. This requires the CDMA system to provide data services. And professional mobile Compared with Cellular Digital Packet Data ("CDPD") in the data network, data services provided in a CDMA system have a large wireless coverage area, a small investment by operators, and users can take into account voice and data services. Features. So, develop CDMA data services and then upgrade to CDMA based Provide high-speed integrated services 3G system, the mobile communications industry is the development direction of the current, CDMA data services to the circuit switched service type, mainly can be divided into the following three operations:

Asynchronous data: This is the most basic function of circuit data services in CDMA, providing point-to-point asynchronous, full-duplex data connections between end users. On this basis, various services can be implemented, such as file transfer and Internet access. G3 fax: G3 fax is a personal computer ("PC") fax. G3 fax is similar to asynchronous data, except that the data transmitted is fax data based on the G3 fax standard. By using this service, a PC with a fax application software and a CDMA mobile phone or a fixed station can send and receive faxes with another PC with a fax application software or an ordinary analog fax machine.

Analog fax: The difference between analog fax and G3 fax is that the mobile device is not a PC, but a T.30 standard based on the International Telecommunication Union-Telecommunication Standardization Sector ("ITU-T") And T.4 standard facsimile machines, a CDMA fixed station is required at this time. For detailed technical details of the circuit data service, please refer to "Data Service Options for Wideband Spread Spectrum Systems", namely TIA / EIA / IS-707 (Chinese name can be translated as "Data Service Options for Broadband Spread Spectrum System", which is the tentative standard- 707) protocol, which is not described in this article. For ease of understanding, the structure of the analog fax protocol stack defined in TIA / EIA / IS-707A.7 is attached, as shown in FIG. 1. For a detailed description of the protocol stack structure, refer to related protocols, and details are not described herein. In the circuit data service of CDMA, facsimile is more and more widely used as an important service type. Worldwide, fax has proven to be a very reliable method of file transfer. The rapid development of the Internet Protocol (IP) network has had a huge impact on the fax system. ITU-T has also released IP fax protocols such as T.38, T.37, fax services, and IP. The combination of networks has become tighter. Through IP fax, on the one hand, it can expand the application range of existing fax machines, and on the other hand, it can provide value-added services for the Internet. The schematic diagram of the IP fax transmission model in the ITU-T T.38 protocol is shown in Figure 2. In practical applications, the above solution has the following problems: The existing IP fax is mostly implemented by a wired access communication system, such as a telephone access system, and the current CDMA system cannot yet support the IP fax service. Summary of the invention

In view of this, the main object of the present invention is to provide a method for enabling a code division multiple access system to support the Internet Protocol (IP) facsimile service, so that the IP facsimile service can also be realized through a CDMA system.

In order to achieve the above objective, the present invention provides a method for enabling a code division multiple access system to support Internet Protocol (IP) facsimile services. The CDMA system includes mobile terminal equipment, base station / mobile service switching center equipment connected in sequence. , An interworking function device, the mobile terminal device is connected to a facsimile device, the interworking function device is connected to an IP network, and the method includes adding an IP facsimile function to the mobile terminal device. The present invention also provides a method for enabling a CDMA system to support an Internet Protocol (IP) facsimile service. The CDMA system includes a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and a mobile device connected in sequence. The terminal device is connected to a facsimile device, the interworking function device is connected to an IP network, and the method includes adding an IP fax function to the interworking function device. The present invention also provides a method for enabling a CDMA system to support an Internet Protocol (IP) facsimile service. The CDMA system includes a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and a mobile device connected in sequence. The terminal device is connected to a facsimile device, and the interworking function device is connected to an IP network, which includes adding a fax gateway between the interworking function device and the IP network that supports an internet fax protocol. The present invention also provides a method for enabling a CDMA system to support an Internet Protocol (IP) facsimile service. The CDMA system includes a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and a mobile device connected in sequence. The external facsimile equipment of the terminal equipment includes adding an IP facsimile function to the mobile terminal equipment and the interworking function equipment. Further, in the above method provided by the present invention, a transmission layer protocol corresponding to the internet facsimile protocol uses a transmission control protocol, or uses a user data packet protocol and adds a user datagram protocol transmission layer on an application layer. Further, in the above method provided by the present invention, the facsimile device may be an ordinary fax machine. Real machine or PC with fax application software installed.

Further, in the above method provided by the present invention, the facsimile device, the mobile terminal device, the base station / mobile service switching center device, and the interworking function device are sequentially connected through an RJ-11 interface, a Urn interface, and an L interface, respectively. . .

Further, in the above method provided by the present invention, the facsimile device may be a facsimile receiving device or a facsimile transmitting device. In addition, the present invention also provides a CDMA system for implementing an IP fax service and a system for implementing an IP fax service. It can be found through comparison that the technical solution of the present invention is different from the prior art in that the solution proposed by the present invention is achieved by adding an IFP protocol to a CDMA system device or a user terminal, or by adding an IP fax sending or receiving gateway outside the CDMA system. The purpose of enabling CDMA systems to support IP fax services.

This technical solution difference brings relatively obvious beneficial effects, that is, the method for enabling a CDMA system to support the IP fax service provided by the present invention can overcome the defect that the existing CDMA system does not support IP fax, and further expands The business scope of CDMA system and the scope of use of fax. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the structure of an analog fax protocol stack defined in TIA / EIA / IS-707A.7; Figure 2 is a schematic diagram of an IP fax transmission model according to the ITU-T T.38 protocol; Schematic diagram of a protocol stack that adds an IP fax function to a mobile terminal type 2 (Mobile Termination 2 ("MT2" for short) of the CDMA system) to implement IP fax in the preferred embodiment; FIG. 4 is a diagram of a preferred embodiment of the present invention. CDMA system's InterWorking Function ("IWF" for short) adds IP fax function to realize IP Schematic diagram of the fax protocol stack;

5 is a schematic diagram of a protocol stack of an IP fax gateway plugged into a CDMA system to implement IP fax according to a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of a protocol stack for simultaneously modifying MT2 equipment and IWF equipment of a CDMA system to implement IP fax according to a preferred embodiment of the present invention. DETAILED DESCRIPTION To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

First, the specific concept of the present invention will be described. For the convenience of description, the protocol stack structure for realizing IP fax in the present invention is obtained by improving the protocol stack of analog fax. In fact, without departing from the scope defined by the claims, other similar faxes can also be improved. Protocol stack to obtain the protocol stack of the present invention. Because the Internet Fax Protocol (Internet Facsimile Protocol, "IFP") is required to implement the IP fax service, there is no IFP protocol layer in the analog fax protocol stack of the CDMA system defined in TIA / EIA / IS-707A.7. There is only an analog fax layer. Therefore, in order to implement the IP fax service in a CDMA system, it is necessary to modify the analog fax protocol stack of the CDMA system, and add an IFP protocol layer and related transport layer protocols to support the IP fax function. In the present invention, the transport layer protocol uses a user datagram protocol (User Datagram Protocol, "UDP" for short). Since the UDP protocol is a connectionless-oriented protocol, the transmission is not reliable. In order to increase the reliability of the transmission, an additional increase is required. User Datagram Protocol Transport Layer ("UDPTL" for short) to ensure the reliability of data transmission.

The embodiments of the present invention are described below in combination with specific embodiments of the present invention. As shown in Figure 1, in the analog fax protocol stack of the CDMA system defined in TIA / EIA / IS-707A.7, it includes a terminal equipment type 2 (Terminal Equipment 2, abbreviated as "TE2") device 10, and a mobile terminal type 2 (MT2 ) Device 20, base station / mobile services switching center (Base Station / Mobile services Switching Center, referred to as "BS / MSC") device 30 and IWF device 40. among them, TE2 is an ordinary fax machine based on the ITU-T T.30 and T.4 standards. MT2 is connected to TE2 through the standard interface RJ-11. In order for the CDMA system to support the IP fax service, the protocol layer implementation of different devices can be modified, and accordingly there will be multiple solutions. However, all these solutions are implemented based on the addition of an IFP protocol layer capable of supporting IP fax in a CDMA system, except that the IFP protocol layer is added at different positions. In the method for enabling the CDMA system to support the IP facsimile service proposed by the present invention, there are four different methods for adding equipment corresponding to the IFP protocol layer: adding an IFP protocol layer function on the MT2 device and adding an IFP protocol layer on the IWF device Function, an external IP fax gateway system, while adding IFP protocol layer functions to MT2 equipment and IWF equipment. These are explained separately below. According to a preferred embodiment of the present invention, a schematic diagram of a protocol stack of a system for adding an IP fax function to an MT2 device of a CDMA system to implement an IP fax service is shown in FIG. 3.

As shown in FIG. 3, it is shown that an IP fax function is added to the MT2 device to enable the CDMA system to support the IP fax service protocol stack. Among them, for the convenience of description, the TE2 device 10 is a fax machine conforming to the T.30 and T.4 devices. It may also be a PC with fax application software installed, and the fax device may be a fax sending device or a fax receiving device, the MT2 device 50 is a mobile terminal type 2 device, and the BS / MSC device 30 may be in compliance with the tentative standard The base station / mobile service switching center equipment of IS-707A, and IWF equipment 60 are interworking function equipment. It should be noted that, in the above and following descriptions, the device is not limited to the specific types described above as long as it can achieve the object of the present invention.

According to the ITU-T T.38 protocol, the TE2 device 10 is connected to the MT2 device 50 through the RJ-11 interface, the MT2 device 50 and the BS / MSC device 30 are connected through the Um interface, and the BS / MSC device 30 and the IWF device 60 are connected through the L interface. . To implement IP fax, the IWT device 60 is connected to an IP network, and the IP network is further connected to a fax gateway device 70. The fax gateway device 70 is a standard device that complies with the ITU-T T.38 protocol, and may be a receiving gateway accordingly. Or a sending gateway, the fax gateway 70 is connected to a receiving or sending fax machine via a PSTN. Although shown in Figure 3 is a mobile system -IP fax between wired systems. It can be understood that by connecting the symmetrical CDMA network supporting the IP fax service on both sides of the IP network, the mobile system-mobile system IP fax can also be implemented.

Compared with the existing standard MT2 device 20, the protocol stack of the MT2 device 50 and the IWF device 60 has removed the analog fax layer, ie, the AFAX protocol layer. The MT2 device 50 adds an IFP protocol layer to support IP fax services, uses the UDP protocol on the transport layer, and adds the UDPTL protocol layer on the application layer to ensure unreliable UDP protocol transmission quality. The IWF device 60 only needs the protocols below the IP protocol to complete the IP fax service, so it removes all protocols above the transport layer. Of course, without affecting the technical solution of the present invention, the IFP protocol layer can be added to the MT2 device 50 without removing the existing analog fax layer, and the IWF device 60 can be removed without including the transport layer or more. The CDMA system thus obtained can be compatible with IP fax and analog fax. Those skilled in the art can understand that after adding the IFP protocol supporting IP fax and the corresponding transmission protocol to the MT2 device 50, it is possible to use both circuit data services and IP fax services can be implemented with packet data services. According to a preferred embodiment of the present invention, a schematic diagram of a protocol stack of a system for adding an IP facsimile function to an IWF device in a CDMA system to implement an IP facsimile service is shown in FIG. 4.

As shown in FIG. 4, a protocol stack that adds an IP fax function to the IWF device to enable the CDMA system to support the IP fax service is similar to that in FIG. 3. For convenience of description, the fax device TE2 10 is compliant with T.30 and T. .4 device fax machine, of course, it can also be a PC with fax application software installed, and the fax device can be a fax sending device or a fax receiving device, MT2 device 20 is a mobile terminal type 2 device, and BS / MSC The device 30 may be a base station / mobile service switching center device complying with the tentative standard -707A, and the IWF device 80 is an interworking function device.

According to the ITU-T T.38 protocol, the TE2 device 10 is connected to the MT2 device 20 through the RJ-11 interface, the MT2 device 20 and the BS / MSC device 30 are connected through the Um interface, and the BS / MSC device 30 It is connected to the IWF device 80 through the L interface.

Similarly, to implement IP fax, the IWF device 80 is connected to an IP network, and the IP network is further connected to a fax gateway device 70. The fax gateway device 70 is a standard device that complies with the ITU-T T.38 protocol, and accordingly The destination may be a receiving gateway or a sending gateway, and the fax gateway 70 is connected to the receiving or sending fax machine via the PSTN. Although shown in FIG. 4 is an IP facsimile between a mobile system and a wired system, it can be understood that by connecting the symmetrical CDMA network supporting the IP facsimile service on both sides of the IP network, a mobile system-mobile can also be implemented The system's IP fax. Compared with the existing standard IWF device 40, the IWF device 80 adds an IFP protocol layer to support IP fax services, uses the UDP protocol on the transport layer, and adds the UDPTL protocol on the application layer to ensure unreliable UDP protocol transmission quality . Those skilled in the art can understand that the CDMA system can support IP fax by adding the IFP protocol and corresponding transmission protocols that support IP fax to the IWF device 80.

It should be noted that, in this preferred embodiment, the IWF device 80 still retains the analog fax layer, the fax mode between the IWF device and the device on the mobile station side is unchanged, and the analog fax protocol is still used. In this preferred embodiment, there is no need to change the equipment on the mobile station side, that is, the user terminal does not need to be changed, and only the CDMA system equipment needs to be changed to support the IP fax service.

The following describes a preferred embodiment in which a CDMA system supports IP fax services by integrating existing standard equipment without modifying existing equipment. According to a preferred embodiment of the present invention, a schematic diagram of a protocol stack of a system that enables a CDMA system to support IP fax services through an external IP fax gateway is shown in FIG. 5. As shown in FIG. 5, a system for enabling a CDMA system to support an IP fax service through an external IP fax gateway is shown, including: TE2 equipment 10, MT2 equipment 20, BS / MSC equipment 30, and IWF equipment 40 similar to those in FIG. 3. The IWF device 40 is externally connected to a sending or receiving fax gateway device 90. Among them, the facsimile gateway device 90 is a standard device conforming to the ITU-T T.38 protocol.

According to ITU-T T.38 protocol, TE2 device 10 is connected to MT2 device 20 through RJ-11 interface. The MT2 device 20 and the BS / MSC device 30 are connected through a Um interface, and the BS / MSC device 30 and the IWF device 40 are connected through an L interface.

Similarly, in order to implement IP fax, the fax gateway device 90 is connected to an IP network, the IP network is further connected to a fax gateway device 70, and the fax gateway device 70 is a standard device that complies with the ITU-T T.38 protocol. And correspondingly, it may be a receiving gateway or a sending gateway, and the fax gateway 70 is connected to the receiving or sending fax machine via the PSTN. Although shown in FIG. 5 is an IP fax between a mobile system and a wired system, it can be understood that by connecting the symmetrical CDMA network supporting the IP fax service on both sides of the IP network, a mobile system-mobile can also be implemented The system's IP fax. Those skilled in the art can, in this preferred embodiment, integrate existing equipment without modifying the terminal and the existing equipment, and still use the analog fax protocol defined by IS-707A.7, only in the CDMA system. The core network can easily implement the IP fax service of the CDMA system by adding a gateway device for receiving and sending the IP fax, without requiring additional development work of the terminal or the network.

MT2 and IWF inherit the design idea of the peer layer on the protocol stack in the circuit data service, borrowing from Wideband Code Division Multiple Access ("WCDMA") version 4 (Release 4, "R4" ) In the non-transparent fax protocol "Technical realization of facsimile group 3 non-transparent" 3rd Generation Partnership Project ("3GPP") TS 23.146, Chinese can be translated as "G3 fax non-transparent technology implementation 》, By modifying MT2 equipment and IWF equipment at the same time, IP fax service can also be realized in CDMA system. According to a preferred embodiment of the present invention, a schematic diagram of a system protocol stack for implementing an IP fax service in a CDMA system by adding an IP fax service function to both an MT2 device and an IWF device is shown in FIG. 6. As shown in FIG. 6, a CDMA system protocol stack capable of implementing the IP fax service is shown, which includes: two TE2 devices 10 (sending TE2 device 10-1 and receiving TE2 device 10-2), MT2 device 50, and BS / MSC device 30 , IWF equipment 80 and public switched telephone network (Public Switched Telephone Network, referred to as "PSTN" device 100. An IFP protocol layer is added to the MT2 device 50 and the IWF device 80. According to the ITU-T T.38 protocol, the sending TE2 device 10-1 is connected to the MT2 device 50 through the RJ-11 interface, the MT2 device 50 and the BS / MSC device 30 are connected through the Um interface, and the BS / MSC device 30 and the IWF device 80 are connected through L interface connection. The IWF device 80 is connected to the PSTN device 100, and the PSTN device 100 is connected to the receiving TE2 device 10-2. The foregoing devices are all described above or are well known to those skilled in the art, and are not described herein again. Those skilled in the art can understand that using this system on the network is exactly the same as IS-707A.7 analog fax networking, and does not require an external IP fax sending and receiving gateway. To the user, it is exactly the same as the analog fax service, so the service can be smoothly upgraded. Those skilled in the art can understand that the transport layer protocol in the above solution of the present invention can also be implemented using a reliable connection-oriented Transfer Control Protocol ("TCP" for short), and the TCP protocol is used instead of the UDP protocol and the UDPTL protocol. Does not affect the essence of the invention. Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, those skilled in the art should understand that various changes can be made in form and details, and Without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

Claim

1. A method for enabling a CDMA system to support an Internet Protocol (IP) fax service, the CDMA system comprising a facsimile device, a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and an interworking function device connected in sequence The external IP network includes adding an IP fax function to the mobile terminal device.

2. The method according to claim 1, wherein the facsimile device is an ordinary facsimile machine or a PC with facsimile application software installed.

3. The method according to claim 1, wherein the facsimile device, mobile terminal device, base station / mobile service switching center device, and the interworking function device are respectively connected through an RJ-11 interface, a Um interface, and an L The interfaces are connected in order.

4. The method according to claim 1, wherein the function of adding an IP fax is implemented by adding an Internet Fax Protocol (IFP) protocol layer, and a transport layer protocol corresponding to the Internet Fax protocol is used. Transmission control protocol, or use user data packet protocol and add user datagram protocol transmission layer on the application layer.

5. A method for enabling a CDMA system to support an Internet Protocol (IP) fax service, the CDMA system including a facsimile device, a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and an interworking function device connected in sequence The external IP network includes adding an IP fax function to the interworking function device.

6. The method according to claim 5, wherein the function of adding an IP fax is implemented by adding an Internet Fax Protocol (IFP) protocol layer, and a transport layer protocol corresponding to the Internet Fax protocol is used. Transmission control protocol, or use user data packet protocol and add user datagram protocol transmission layer on the application layer.

7. The method according to claim 5, wherein the facsimile device is a common facsimile machine or a PC installed with a fax application software.

8. The method according to claim 5, characterized in that the facsimile device, mobile terminal device, base station / mobile service switching center device and the interworking function device are respectively connected through an RJ-11 interface, a Um interface, and an L The interfaces are connected in order.

9. A method for enabling a CDMA system to support an Internet Protocol (IP) fax service, the CDMA system including a facsimile device, a mobile terminal device, a base station / mobile service switching center device, an interworking function device, and an interworking function device connected in sequence The external IP network includes adding a fax gateway that supports an internet fax protocol between the interworking function device and the IP network.

10. The method according to claim 9, wherein the function of adding an IP fax is implemented by adding an Internet Fax Protocol (IFP) protocol layer, and a transport layer protocol corresponding to the Internet Fax protocol is used. Transmission control protocol, or use user data packet protocol and add user datagram protocol transmission layer on the application layer.

11. The method according to claim 9, wherein the facsimile device is a common facsimile machine or a PC installed with a fax application software.

12. The method according to claim 9, wherein the facsimile device, mobile terminal device, base station / mobile service switching center device, and the interworking function device are respectively connected through an RJ-11 interface, a Um interface, and an L The interfaces are connected in order.

13. A method for enabling a CDMA system to support an Internet Protocol (IP) facsimile service, the CDMA system including a facsimile device, a mobile terminal device, a base station / mobile service switching center device, and an interworking function device connected in sequence, including in the mobile Both the terminal equipment and the interworking function equipment have added the IP fax function.

14. The method according to claim 13, wherein the function of adding an IP fax is implemented by adding an Internet Fax Protocol (IFP) protocol layer, and a transport layer protocol corresponding to the Internet Fax protocol is used. Transmission control protocol, or use user data packet protocol and add user datagram protocol transmission layer on the application layer.

15. The method according to claim 13, wherein the facsimile device is a general Communication fax machine or PC with fax application software installed.

16. The method according to claim 13, wherein the facsimile device, mobile terminal device, base station / mobile service switching center device, and the interworking function device are respectively connected through an RJ-11 interface, a Um interface, and an L The interfaces are connected in order.

17. A CDMA system for implementing an IP fax service, including a facsimile device, a mobile terminal device, a base station / mobile service switching center device, and an interworking function device connected in sequence, wherein the mobile terminal device is external to the facsimile device, and The IP fax function is added to the terminal equipment and interworking equipment.

18. A system for implementing an IP fax service, including a fax sending device, a mobile terminal device, a base station / mobile service switching center device, an interworking function device, an IP network, a receiving fax gateway, a PSTN, and a receiving fax device, which are connected in sequence, wherein An IP fax function is added to the mobile terminal device, and the receiving fax gateway is a standard device that complies with the tentative standard IS-707A.