CN1289497A

CN1289497A - Communications system for mobile data transfer

Info

Publication number: CN1289497A
Application number: CN99802524A
Authority: CN
Inventors: 贾森·斯图尔特·弗林
Original assignee: British Telecommunications PLC
Current assignee: British Telecommunications PLC
Priority date: 1998-01-29
Filing date: 1999-01-29
Publication date: 2001-03-28
Also published as: EP1051825A1; WO1999039488A1; JP2002502189A

Abstract

A communications system for mobile data transfer, comprising a communications network (25), an application module (45, 46, 47) and a separate terminal module (48), where data is transferred between the network (25) and the application module (45, 46, 47) via the terminal module (48), which hides network dependent operations such as error control from the application module. By implementing the communications stack (12, 13) in the terminal module rather than in the application module, the invention is capable of providing a complete communications package, in a portable terminal module (48) or on a single plug-in card, capable of interfacing with a wide variety of application modules (45, 46, 47, 92).

Description

Transmit the communication system of mobile data

Invention field

The present invention relates to a kind of communication system, this communication system is special but be not limited to be applied to transmit mobile data between the network based on IP.

Background of invention

Known have various data communication systems.For the grid with network or Internet is connected, most of mobile data users are used in combination the gsm mobile telephone that has data card and suitable host platform now, and this host platform is generally the operation Email or the notebook computer of the one or more application programs of teletransmission file and so on network.In general, the requirement to mobile system is can connect to reach between heterogeneous networks and move but the constant mobile host in address, even also can connect continuously and seamless roam when operation one web application.

The architecture of general communication system can be easily referring to 7 layers of reference model of well-known International Organization for Standardization shown in Figure 1.

A kind of communication subsystem of this pattern description comprises two host As and B that each is represented with seven protocol layers of layer 1-7, and these two main frames connect by a data network 8 with gateway or router 9.Arrow between each layer represents that logic therebetween connects.Each layer in this pattern carried out a kind of function of strict difinition and the operation of agreement according to the rules, so as with a remote system in respective layer exchange message.In the reality, carry out this exchange by data encapsulation: sending on the main frame, pass through this layer stack by the data that user's application process (AP) 10 generates downwards as a series of data cells, each layer adds control information on these data cells, can transmit on network up to these data cells.Receiving on the main frame, upwards by this layer stack, peel off by correspondence and send the control information that layer generates by each receiving layer towards user AP10 for each data cell of being received.

Layer 1-3 carries out and the network function associated, the difference of its operation details view network type and difference.Layer 1 is that physical layer is provided at the required device of transmission serial bit stream, for example electric installation on the network 8.The function that layer 5-7 carries out application program-oriented method or have nothing to do with network, layer 7 is that application layer provides user interface.Layer 4 is that transport layer is used as the interface between each layer of relevant each layer with network and application program-oriented method, the message transmitting function that the session layer 5 of its top has and beneath network has nothing to do.The end-to-end message that transport layer is responsible between host A and the host B transmits, and comprises connection management and wrong control and so on function.Details about this reference model of ISO are seen " Data Communications, Computer Networks and Open Systems ", Fred Halsall, and Addison-Wesley, 4th Edition, Chapter 1.30

In the Internet, data transmit based on the one group of agreement that is commonly referred to as TCP/IP, and TCP/IP provides the layered protocol structure that is commonly referred to protocol stack or communication stack.Except the basic network agreement, this ICP/IP protocol cover comprises some well-known application protocols, comprises file transfer protocol (FTP) (FTP) and remote terminal protocol (TELNET).Fig. 2 letter illustrates the logical construction of these layered protocols.

This ICP/IP protocol cover is generally with one 4 layer models, rather than the description of the ISO7 layer model of Fig. 1, although between these two patterns certain corresponding relation is arranged.Application protocol layer 1l comprises the layer 5-7 in 7 layer models, and provides telefile to transmit (FTP), remote terminal login (TELNET) and e-mail (SMTP) and so on function.Layers 4 corresponding in TCP/UDP (transmission control protocol/User Datagram Protoco (UDP)) layer 12 and 7 layer models.TCP and UDP be with two main frames between the relevant transportation protocol of management that transmits of end-to-end information.Layers 3 corresponding in IP (IP) layer 13 and 7 layer models, layer 1 and 2 in network interface layer 14 and 7 layer models is corresponding, the required device of conversion between the IP layer data unit is provided and on physical network 8, transmits the desired data form, for example based on the ethernet frame of the network of Ethernet.

IP (IP) is provided at work between the heterogeneous networks required some Core Features and relevant rules, comprise the burst of user's message and compile, the route and the addressing of network.Data in the Internet between by the each point of IP address regulation the form with the data cell that is called IP datagram transmit.The details of IP are seen " request for comments (Request for Comments) " file that IETF has, RFC791, and this can be on the Internet for example downloads from " ftp: //ds.internic.net/rfc/rfc791.txt ".Not only most important to the Internet technology, IP also is widely used as the basic agreement that data transmit between net outside the Internet.

Look employed agreement, data can not have on the basis of connection or transmit on connection-oriented basis in the Internet.User Datagram Protoco (UDP) (UDP) provides and do not have to connect IP datagram and transmit service, and it does not keep end-to-end the connection with receiving between the main frame sending main frame, does not therefore guarantee transmission.It only does best test transmission to each datagram as self-contained entity.Error checking is undertaken by the application program of using the UDP service: like this, just can't know whether a datagram has arrived the reception main frame or do not lose in transmission.This transmission is suitable for certain type data, for example image or voice data, and this moment, speed was more important than the transient error that unlikely receiving image or sound quality is had a significant impact.

But the connection-oriented reliability services of most of application needs transmits to guarantee IP datagram.Transmission control protocol (TCP) is a kind of Connection-oriented Protocol that keeps end-to-end connection between the communication process that operates in pairs on the main frame, and it provides reliable logic with safety to be connected for the data between the process transmit.

The TCP supposition it can obtain simple but the insecure data, services of possibility from the IP layer of its below.For this data, services is transformed into reliable service, its function must comprise that (a) master data transmits, (b) reliability and error correcting, so that the data of restoring damaged data or obliterated data or transmitting with wrong order, (c) flow control, provide control by the device that sends the data volume that main frame sends for receiving main frame, (d) multiplexed, the many processes in the individual host that make are used its TCP function simultaneously, (e) link information of each connection between maintenance two processes, and (f) priority routine and fail safe.TCP rules about the detail requirement of carrying out the premises are seen RFC793.

In known system, the ICP/IP protocol stack is carried out with software, resides at an application module usually, for example in the operating system of a notebook computer and become a part of this operating system.The user passes through the process of operating system access TCP as the user capture computer file system.Can buy the various TCP/IP instruments that can be used for DOS and UNIX and so on different platform, for example, MicrosoftWindows95 and Windows NT operating system the TCP/IP of Microsoft software as its part.

As shown in Figure 3, can between two master computers, transmit the operational mode of data in conjunction with well-known client-server mode declaration pattern specification TCP.For example, a basic demand in the compartment system is that visit is stored in the information on the telefile server.FTP provides this class visit.Client A can be notebook computer and so on application module, the client to the remote computer B of solicited message be called server.The operating system of client and server all comprises the TCP/IP module.

The user gives an order and access customer FTP process 16 through client terminal 17.Perhaps, user program/application process (AP) 17 visit FTP.Which kind of situation no matter, user command passes to client operating system 18, and client operating system 18 calls client FTPi6.Client FTP calls tcp module 19 through operating system 18.Client FTP16 uses the tcp data service of transmitting between client and the server tcp module 19,20 that server FTP21 is issued in this order.Server FTP then according to user command through its operating system 23 its local file systems 22 of visit, give the user after then desired data being passed back client FTP16.How the following describes TCP connects with remote server.

In order to discern the treatable separate data stream of a TCP instrument in the main frame, TCP19 provides a port identifiers 24 to each single process.Each TCP independently selects port identifiers, so port identifiers is not unique.For unique address is provided, the IP address combination of port identifiers and main frame generates one and be unique socket in the all-network that links together.One connects and to be stipulated fully by a pair of socket at two ends, one on client TCP19, one on server TCP20.Each main frame socket can participate in many independent connections.

This socket model is proposed by the Berkeley software portion (BSD) of University of California-Berkeley the earliest, and it is all TCP/IP software-based standards thereon, and its objective is to the network on any special operating system uses provides common interface.As using the platform based on MicrosoftWindows, application programming interfaces (API) that are called Microsoft Winsock (Windows sockets) are carried out the version based on Windows of BSD socket model.In the system based on Windows, Winsock software is installed with TCP/IP, make application program with meet the TCP/IP instrument interoperability of Winsock rules.Microsoft Winsock rules can be downloaded on many network address of Internet, for example ftp: //ftp.microsoft.com/bussvs/Winsock/specll.txt.

Some well-known process for FTP and TELNET and so on, the port identifiers part of this socket is predesignated: for example, any server of carrying out the FTP process all gives port No. 21, thereby can move the FTP process as long as just be connected with No. 21 ports of server on any server.See the TCP rules of above-mentioned RFC793 about the explanation of how to set up, to safeguard and closing socket.

Because TCP will provide various functions, therefore a problem during it uses is, no matter see the extra process of still carrying out from most of network application requirement TCP from required storage, too much by the overhead that the whole ICP/IP protocol stacks of execution cause, so the burden of the processing on the client processor increases greatly.

The present invention's general introduction

For addressing the above problem, the invention provides a kind of communication system that transmits mobile data, but comprise that the application module and of a communication network, a network data can provide the terminal module of serving with the transmission of network extraneous data to this application module.

Network data can be the data that are sent to this application module from network, also can be the data that are sent to network from this application module.

The advantage of system of the present invention is that the complexity of protocol stack can be transferred to an independent terminal module from each application module of a plurality of application modules.Therefore this communication system can comprise terminal module and one or more better simply application module of a complexity.Thereby can use the limited cheap application module of multiple function to constitute, thereby reduce with existing system more complicated and cost, because need not to provide memory space and disposal ability for the managing data transfer of complexity, they are provided by this terminal module.

Protocol stack is transferred to the various application modules that also can in this system, use the complexity that originally can't carry out the ICP/IP protocol stack in the independent device.

In system of the present invention, but the application module structure makes and has only by terminal module and could transmit data between network and application module.

Data between network and the terminal module transmit any work of treatment that does not relate in the application module, so the high overhead operations of error detection and so on is not carried out on application module operating system or processor.These operations can be carried out by the processing unit in the terminal module.When needs when application module transmits data, can between terminal module and application module, carry out this transmission through hardware link, its bit error rate is very low.

Hardware link can be the physics wired connection, for example uses the ready-made serial line interface on the standard computer, also can be infrared link.Also can use other forms of link, comprise that optical fiber connects.

Except mistake control, terminal module also can be used for carrying out all connection managements, data fragmentation and flow control work, thereby hides the detail operations of below network to application module.

Protocol stack means that with separating of application module the data between terminal module and each application module transmit does not stipulate agreement.Therefore must stipulate that an agreement guarantees that the application process of moving can evenly visit this stack in all types of application modules.Therefore the present invention further provides, and the device that can provide logic to connect between them respectively is provided for terminal module and application module.

Session layer as handle in 7 layer models and some function at least of presentation layer are incorporated in the terminal module, also can further alleviate the burden on the application module processor.For example, network data can be transformed into the ASCII fromat of standard by terminal module before passing to application module.The shortcoming of this method is that the function increase of terminal module can cause the flexibility of application module to reduce.

According to a second aspect of the present invention, be provided for a kind of terminal module of mobile communications network, comprise first jockey and second jockey that is connected this terminal module and an application module that connect this terminal module and this network, wherein, this terminal module can provide the transmission service with the irrelevant data of network to each application module of a plurality of independent application modules.

The shape of this terminal module and size are preferably made to be convenient to the user and to carry, and for example is contained on user's the waistband.This device can be incorporated in the PCMCIA type card, and this card is easy to carry, as long as should just being connected with this application module easily by card in the corresponding socket of this card insertion one application module.Therefore, the present invention can provide a complete communications packets on a single plug-in card.

The present invention also provides an a kind of application module in a communication network to transmit the method for data, be included in one with terminal module that this application module separates on receive the data of destination for this application module, handle the data of receiving then, so that the transmission service of the data that have nothing to do with network is provided to this application module.

Brief description of drawings

Below in conjunction with description of drawings exemplary embodiments of the present invention, in the accompanying drawing:

Fig. 1 illustrates 7 layers of reference model of the ISO that is used for general communication subsystem;

Fig. 2 letter illustrates the protocol architecture of each agreement in the ICP/IP protocol cover;

Fig. 3 letter is illustrated in the Client that is applied to a FTP process in the Internet;

Fig. 4 letter illustrates an available data communication system;

Fig. 5 is the workflow diagram of Fig. 4 system;

Fig. 6 letter illustrates system of the present invention;

Fig. 7 is the schematic diagram of a terminal module and an application module;

Fig. 8 is the workflow diagram of Fig. 6 system; And

Fig. 9 illustrates a kind of practical application of system of the present invention.

Describe in detail

As shown in Figure 4, an available data communication system comprises the IP-based network 25 that is connected with the Internet (not shown) once a gateway 26.Comprise that a plurality of application modules of

notebook computer

27,28 and integrated form palmtop PC/mobile phone 29 of Nokia 9000 Communicator and so on can be connected with network 25.For example, a notebook computer 27 usefulness data cards 30 are connected with network 25 through the RF unit 32 based on mobile IP with gsm mobile telephone 31.Generally set up this connection through an Internet service supplier (ISP) who provides the Internet to insert.Other application modules of notebook computer 28 and so on can be connected with the Internet through hardwired 33, for example computer standard serial port, also reliable infrared link 34 is connected with the Internet, and the infrared port on this infrared link use notebook computer is connected with the infrared port 35 on the network 25.Each

application module

27,28,29 has an ICP/IP protocol stack of installing as the part of its local operating system, thereby can communicate by letter based on the main frame (not shown) foundation of Internet by reliable the connection with one of one or more TCP.

Can understand the working condition of this existing system in conjunction with an application process, for example, as shown in Figure 5, one uses user capture one Telefile of the notebook computer that FTP and TCP/IP are housed.

For simplicity's sake, suppose that client FTP knows the IP address of destination server, carry out an operation with reference to a master computer that is called name server usually.As shown in Figure 5, the order of keying in given server positions and filename in application module terminal 41 during the telefile of user on request access file server 40.This operating system (not shown) sends " fopen " request (step s1) to client FTP42.Then, client FTP42 sends the ACTIVE_OPEN request (s2) of the IP address of designated port identifier (21 are well-known FTP port) and server 40 to client's tcp module 43.Client TCP43 responds (s3) with an OPEN_ID message, is assigned to the local connection name of this connection to client FTP42 notice TCP.Client TCP43 makes great efforts and server 40 connect (s4-s9) then.The protocol command order that

tcp module

43,44 matched and connect, transmitted then data is known, and its details are seen TCP rules (RFC793).The summary of this process is also shown in " data communication, computer network and open system (Data Communications, Computer Networks and Open Systems) ", Fred Ha1sall shows, Addison-Wesley publishes, and the 4th edition, the 11st, 13 and 14 chapters.

As shown in Figure 6, system of the present invention comprises the terminal module 48 that the network 25 that is connected with the Internet (not shown) once a gateway 26, some

application modules

45,46,47 and are

independent.Application module

45,46,47 directly is not connected with network 25, and can be connected with terminal module 48.Terminal module 48 then can be connected with network 25.Compare with the

application module

27,28,29 in the existing system, the

application module

45,46,47 in the system of the present invention does not comprise communication stack, and communication stack is only carried out in independent terminal module 48.

Each

application module

45,46,47 can be connected with terminal module 48 by some different modes.Therefore for example, terminal module 48 and application module 46 respectively comprise an infrared port (not shown), and these two infrared port comprise an infrared ray transmitter and an infrared receiver, can send and reception meets the data of IrDA (Infrared Data Association) standard.The device that meets IrDA is installed in application module has been become very general; For example, on the Psion 3c palmtop PC infrared port is arranged, on the Gateway Solo series notebook computer of the Gateway 2000 Europe companies of Dublin, Ireland infrared port is arranged also.Owing to infrared port is arranged, so application module just can be communicated by letter as long as in the infrared ray overlay area with terminal module 48.

As an alternative or increase, a PCMCIA type card connector 49 can be arranged on the terminal module 48, be used for inserting in the corresponding socket of notebook computer and so on application module 45.Although can on the existing application module of notebook computer and so on, use real pcmcia card, also can be as described below, in the hardware based agreement of using terminal module and being connected of application module much simple.For guaranteeing and existing notebook computer compatibility, can use being connected between terminal module 48 and the application module 45 to meet PCMCIA physics and require but do not meet the card that power technology requires, this card is called " PCMCIA type " card in this article.In another embodiment, terminal module 48 is completely contained on the single PCMCIA type plug-in card, and this card can insert in the corresponding socket of an application module.

Terminal module 48 can be connected with network 25 by some different modes, comprises direct wired connection 50, infrared ray (I-R) link 51 and/or through radio frequency (RF) link 52 based on the RF unit 32 of mobile IP of network 25.The user can use the different links of terminal module 48 as required.As use infrared link 51 and radio frequency link 52, terminal module 48 and network 25 respectively to comprise a suitable transmitter and a receiver (not shown).

As shown in Figure 7, terminal module 48 comprises that a network interface 60, a processing unit 61 and comprise the operating system (OS) 62 of plurality of modules.These modules are a TCP/IP module 63, a sockets interface module 64 and a hardware socket module 65.At last, terminal module 48 comprises an input/output interface 66.

Terminal module 48 for example is the existing notebook computer of Gateway Solo 9100 and so on.Network interface 60 is provided by common gsm mobile telephone, and this mobile phone is connected with notebook computer 48 by a suitable data card, and this data card is for example for being used for the Nokia PC card of Nokia 21 serial GSM phones.As network 25 is Ethnet 10base-T network, also can use the integrated form infrared port on this notebook computer to insert this network, directly wire link is provided by a suitable networks card, for example 3Com Ethernet Combo PC card and Ethernet cable.Processing unit 61 is provided with relevant circuit by the processor of this notebook computer 48.Notebook computer 48 is equipped with operating system 62 in advance and the suitable TCP/IP software of TCP/IP module 63 is provided.For example, the MicrosoftTCP/IP software of configuration prepackage in the notebook computer of operation Microsoft Windows 95, the for example ftp from the Internet then: //ftp.microsoft.com/bussys/WinSock/winsock2 downloads MicrosoftWinsock software, but access network just.Notebook computer 48 uses its infrared port 66 to communicate by letter with

application module

45,46,47.But sockets interface 64 and hardware socket 65 are the software module of income operating system 62, and its function hereinafter describes in detail.

Each

application module

45,46,47 comprises that one can move processor 67, an input/output end port 69 that is connected with terminal module 48 and an operating system (OS) 70 of an application process 68, and this operating system comprises an empty sockets interface module 71 and a hardware socket module 72.This input/output end port 69 comprises direct wired connection, infrared ray transmitter receiver and/or card connector.The same with terminal module 48, application module 45 generally can use Gateway Solo 9100 notebook computers, and an operation one application process, for example processing unit and an infrared transceiver of ftp utility are housed on it, and this illustrates hereinafter.But empty sockets interface 71 and hardware socket 72 are the software module of income operating system 70, and this describes in detail hereinafter.

Terminal module 48 can be combined into a communication subsystem with a single application module 45.As shown in Figure 2, terminal module 48 is realized the layer 12,13 and 14 corresponding with 1-4 layer in 7 layer models.Application module is realized the layer 11 corresponding with 5-7 layer in 7 layer models.This communication subsystem is finished in being connected between terminal module 48 and the application module 45.

For making comparisons, transmit the working condition of data file explanation system of the present invention below in conjunction with client's notebook computer request one remote server with existing system.

As shown in Figure 8, the user's given server of notebook terminal 80 and the title of file, thereby to file server 81 requests one telefile.The same with existing system shown in Figure 5, establish the IP address that client FTP82 has obtained server.This local operating system sends " fopen " request (s11) to client FTP82, and client FTP82 sends ACTIVE_OPEN order (s12), and the operating system (not shown) passes to the common address of TCP/IP to this order downwards.Because TCP/IP does not exist, therefore empty sockets interface module 71 is positioned on this TCP address and this identical front end and gives this operating system, receives the calling of operating system as the TCP/IP module.Need not to revise when the FTP of standard call and Telnet and so on ready-made application program is used in system of the present invention thereby guarantee to produce to TCP.The function of empty sockets interface 71 is this operating system to be called out be transformed into hardware socket 72 and can be used to the form of communicating by letter with the hardware socket 65 in the terminal module 48.Therefore empty sockets interface 71 is realized a look-up table, and this look-up table comprises with operating system calls out corresponding mark.The mark of ACTIVE_OPEN order can be a numeral, for example the decimal system " 10 ".

Hardware socket

72,65 communicates (S13) by transmitting this class mark, looks the different in kind of input/

output interface

66,69, and this communication can be taked various different modes.For example, mark can be expressed as the light pulse of a characteristic frequency on binary sequence on the bus or voltage level on the artificial line or the optical link.As use infrared link, and can use the direct modulated infrared transmitter of on-off keying (OOK) to carry out flag transmission, connect transmitter with binary digit 1, disconnect transmitter with binary digit 0." data communication; computer network and open system (Data Communications; Computer Networks andOpen Systems) " seen in detailed description about the modulation of infrared rays method, Fred Halsall shows, Addison-Wesley publishes, the 4th edition, the 6th chapter, 332-334 page or leaf.

Suppose that these devices utilize the infrared port of each notebook computer, terminal module hardware socket 72 is given infrared receiver in the input/output interface 66 of terminal module 48 one infrared pulse sequence transmission, this infrared pulse sequence is corresponding with mark " 10 ", and the direct modulation of the infrared ray transmitter of this mark " 10 " in for example input/output interface 69 is corresponding with the ACTIVE_OPEN request again.65 pairs of signals of being received of hardware socket carry out after the demodulation this mark being passed to sockets interface 64, and this sockets interface is passed to TCP/IP module 63 (s14) after generating the ACTIVE_OPEN request with its look-up table.

In a single day TCP/IP receives this ACTIVE OPEN order, create with server to be connected (s18-s22) preceding, it sends a connection identifier (CID, connects with infrared ray and by above-mentioned label coding-decode procedure one OPEN ID message is passed back application module FTP82 (s15-s17).How TCP sets up a connection-oriented transfer of data route (s18-s22) between terminal module 48 and the remote server 81 that is connected with the Internet be known fully, and it is described in conjunction with Fig. 5 to see above.

Except the marking of order, also can use similar coding principle to transmit various parameters.

In case obtain faultless data block, just can pass to application module 45 to the data that server transmits immediately from terminal module 48.The data that terminal module 48 also can use the hard disk in the notebook computer and so on mass memory stores to transmit from server are passed to application module 45 later on again.

Any device operation hardware socket software of available serializable or parallel transmission data.In typical notebook computer, hardware socket control serial or parallel port and I-R port.No matter which kind of situation realizes the hardware socket by software code, the form that the mark transitions in the sockets interface becomes can transmit on appropriate hardware, vice versa.

Terminal module 48 certainly is a special-purpose member, rather than ready-made device, and this isolated plant does not use the base part of the keyboard of standard configuration in the ready-made device of notebook computer or palmtop PC and so on to satisfy above-mentioned requirements.Sockets interface and hardware socket with software realize with market on the TCP/IP stack interface sold.

In order to reduce cost,

application module

45,46,47 can be reduced to a minimum required function equally.With function software use the common process circuit move required application program and with memory in hard socket and empty sockets interface module interface.Function software can be the type systematic of ELKS, and it is the version that is easy to intercept from UNIX that may operate on the low-power processor.Need to communicate by letter with terminal module 48 with the general data interface.This can for example use MaplinElectronics, and the USART chip of Intel 8251A of UK and so on is realized.Thereby this is the microprocessor that the serial data I/O that meets with standard RS-232 agreement is provided able to programme, and it can directly be connected with terminal module or connect by infrared transceiver.

The same with the software socket, for example when some

application modules

45,46,47 are in the infra-red range of terminal module 48 simultaneously, can between hardware socket module and different application module, open some logics.Each the device transmission and receive capable of circulation carrying out.In software socket environment, when opening a socket, a unique number is passed back the back by this application memory, so that use this socket later on, operating system keeps the context of this socket.This identifier is commonly referred to as socket and handles.The present invention can use this processing, and this unique processing transmits as a marking parameter.

In the present invention's one specific embodiments, terminal module 48 comprises a PCMCIA type plug-in card, this plug-in card comprises an infrared transceiver, one processor and memory, the sockets interface and the hardware socket that ELKS system and so on function software are arranged and realize in the card body with software, therefore just realizing connecting in the corresponding PCMCIA socket of this card insertion application module 47, in the hardware socket 72 of application module appropriate drive software is arranged.

As shown in Figure 9, the user can use this system constantly to obtain information needed in office.All the time carry the roaming device that integrated card 48 is wherein arranged when for example, the user walks about in a big office.Infrared ray transmitter 90 is housed on the ceiling 91, and data pass on the card 48 from these transmitters when the user is in the infrared ray coverage.This storage in the memory of terminal module, addressable these data when the user needs, at this moment, the user can walk close to a standard application modular terminal 92, and this card is inserted in the corresponding socket of this terminal 92, retrieves this information.

When the user walked out office, this roaming device can be switched to RF-wise, continued to receive the data that send to it.Inserting card in one socket of for example palmtop PC then is readable data, and message also can send back to network from palmtop PC.

Although above combination has illustrated the present invention based on the ICP/IP protocol stack of Internet, this principle also can be used for other networks and inter-network, still is other communication protocols of OSI IP and so on no matter be to use the ICP/IP protocol stack.

Claims

1, a kind of communication system that transmits mobile data comprises:

One communication network (25);

But the application module of a network data (45,46,47); And

One provides independent terminal module (48) with the transmission service of the irrelevant data of network to this application module.

2, by the described system of claim 1, it is characterized in that having only terminal module to comprise a protocol stack (12,13) in this application module and this terminal module.

3,, it is characterized in that the data format of data transmission is different between the data format that data transmit between network and the terminal module and terminal module and the application module by claim 1 or 2 described systems.

By the described system of above-mentioned arbitrary claim, it is characterized in that 4, data transmission between network and the terminal module and the data between terminal module and the application module transmit irrelevant.

By the described system of above-mentioned arbitrary claim, it is characterized in that 5, the application module structure only makes and carries out the data transmission by terminal module between network and application module.

6, by the described system of above-mentioned arbitrary claim, it is characterized in that, comprising:

First device (50,51,52) of connecting terminal module and network; And

Second device of connecting terminal module and application module.

7, by the described system of claim 6, it is characterized in that first jockey comprises infrared link (51).

8, by claim 6 or 7 described systems, it is characterized in that second jockey comprises infrared link.

9, by the described system of arbitrary claim among the claim 6-8, it is characterized in that second jockey comprises that one can be connected the card (49) in the corresponding socket in the application module.

10, by the described system of arbitrary claim among the claim 1-5, it is characterized in that terminal module comprises that one can insert the card (48) in the corresponding socket in the application module.

By the described system of above-mentioned arbitrary claim, it is characterized in that 11, terminal module and application module respectively comprise can set up the device (64,65,66,69,71,72) that logic connects between them.

12, by the described system of claim 11, it is characterized in that this jockey comprises a hardware socket (65,72).

13, a kind of terminal module (48) that is used for mobile communications network (25) comprising:

First jockey (50,51,52) that connects this terminal module and this network; And

Second jockey that connects this terminal module and an independent application module (45,46,47);

Wherein, this terminal module can provide the transmission service of the data that have nothing to do with network to each application module of a plurality of application modules.

14, by the described terminal module of claim 13, it is characterized in that first jockey comprises an infrared transceiver.

15, by claim 13 or 14 described terminal modules, it is characterized in that second jockey comprises an infrared transceiver.

16, by the described terminal module of claim 13, it is characterized in that, comprise a PCMCIA type card.

17, a kind of method that transmits data in a communication network to an application module (45,46,47) comprises:

Go up the data of receiving target at a terminal module (48) that separates with this application module for this application module; And

The data that processing is received are so that provide the transmission service of the data that have nothing to do with network to this application module.

18, basically as top described in conjunction with the accompanying drawings a kind of communication system.

19, basically as top described in conjunction with the accompanying drawings a kind of terminal module.

20, basically as the top described in conjunction with the accompanying drawings a kind of method that in a communication network, transmits data to an application module.