Patent Abstract:
A system that uses three different wireless technologies to print a document from a mobile device. The invention is comprised of a server and a client. The server is comprised of a controller, an 802.11x transceiver, a Bluetooth transceiver and a modem. The server waits for a connection from a mobile device and once a connection is detected determines the type of connection. The server uses the proper protocol to extract the print control data and interpret the print type. The server proceeds as normal, converts to printable format, and prints the document. The client can be a personal computer, a laptop, a personal data assistant, or a cellular telephone. The client operating systems include all versions of Windows, Palm OS, Handspring, and Simbian.

Full Description:
BACKGROUND OF THE INVENTION 
     The present invention pertains generally to wireless communication systems and, more particularly, to a method and system of communication between a mobile client device and a wireless wide area network image output system. 
     Users of mobile devices such as a laptop, personal data assistant, or cellular telephone can often access information over the Internet. However, to print this information, the users of these devices usually need to have an image output system physically connected to the client device, or the user must pre-store the document on an internet based storage that can only be accessed by special types of peripheral devices. 
     Mobile client devices are typically equipped with communications systems to communicate with a broad variety of other devices, ranging from a web server to an image output system. Such communications systems may incorporate connections involving IEEE 802.11x (Wi-Fi) or Bluetooth wireless networks. These technologies allow users using a mobile client device, such as notebook computers, personal digital assistants, or even cellular telephones to connect wirelessly to the peripheral and initiate a print job or other output function. However, these mobile client devices do not provide a method for printing documents while at a remote location. 
     Furthermore, these mobile client devices are often limited to the type of communications channel they can establish with an image output system. While this may be suitable for a client device residing solely within a single installation, this is not suitable for a user who travels between installations and is desirous of printing while away from his or her office. A method allowing a mobile client device to communicate with an image output system from anywhere in the world provides much needed flexibility for the mobile user. 
     Thus a method, system and apparatus that brings total mobile printing capability to a mobile user by combining three different wireless technologies with a mobile client device and allow a user to print a document from any location is needed. 
     SUMMARY OF THE INVENTION 
     In accordance with the present invention, there is a method for generating an image from a mobile client device, comprising the steps of receiving a print request, the print request comprising a reference to a file to be printed, retrieving the file to be printed from a remote server, converting the document to be printed to a page description language document, and sending the page description document language document to the printer. In order to print a document from a remote location, the client device establishes a communication channel with the server. The controller, which is a part of the server, then determines the type of transmission occurring. Once the transmission type is determined, the controller is then able to receive a print request from the client device to print a file. The controller must then interpret whether the print request is a print by reference request or if it is a file print request. For the file to be sent on to the image output system, the format of the file must be supported. When the file is unsupported, the controller directs the termination of the connection between the client device and the server. The file, to be printed, must also be in a printable format. If the file is not in a printable format, the controller then converts the file so that printing may occur. 
     Further, in accordance with the present invention, there is a method for generating an image from a mobile client device, comprising the steps of receiving a print request, the print request comprising a file to be printed, sending the file to an application server, converting the file to a page description language document by the application server, and sending the page description language document to the printer. When a client device initiates a print command, the client device also selects an image output system to use. The print command may be issued through an application, e.g., word processing or spreadsheet, a specific user interface, or through a browser. Once selected, the type of the image output system chosen must be determined, that is to say, the type of image output system, be it Bluetooth enabled, IEEE 802.11x (Wi-Fi), cellular, or other communications means. The determination of type also indicates the appropriate communications channel to establish. The controller, considered a part of the server end of the communications, is connected to the image output system. The client device uses an image output system driver to send a file to be printed over the communications channel and to the controller. The file is then transmitted from the controller to the image output system. 
     Still further, in accordance with the present invention, there is provided an apparatus for generating an image from a mobile client device, comprising an image output system, a controller operatively coupled to the image output system, an image receiver, the image receiver comprising an 802.11 interface, a Bluetooth interface, and a dialup interface. The apparatus may also further comprise means adapted to determining when data is being received by the image receiver, and means adapted to routing the data input received by one of the group consisting of an 802.11 interface, a Bluetooth interface, and a dialup interface, wherein the data received is sent to the controller. The apparatus allows for the wireless interface cards to receive data and then send that data to the controller. The controller is then able to process the data so that the image output system can print. 
     Still yet further in accordance with the present invention, there is provided a system for generating an image from a mobile client device, comprising means adapted for receiving a print request, the print request comprising a reference to a file to be printed, means adapted for retrieving the file to be printed from a remote server, means adapted for converting the file to be printed to a page description language document, and means adapted for sending the page description document language document to the printer. The system may further comprise means for routing the print request to the controller, the print request having been received by one of the group consisting of an 802.11 interface, a Bluetooth interface, and a dialup interface. The system may further comprise means adapted for sending the file to one of the groups consisting of an application server and a file converter to convert the file. The system provides for receiving a print request from a mobile device through different wireless technologies and processing the print request. 
     Further in accordance with the present invention, there is provided a system for generating an image from a mobile client device, comprising means adapted for receiving a print request, the print request comprising a file to be printed, means adapted for sending the file to an application server, means adapted for converting the file to a page description language document by the application server, and means adapted for sending the page description language document to the printer. The system may further comprise means adapted for sending the page description language document to a spooler, and means adapted for raster image processing the page description language document. The system may also comprise means adapted to receiving the print request from an 802.11 interface card, a Bluetooth interface card, and a card dialup interface. 
     Still other aspects of the present invention will become readily apparent to those skilled in the art from the following description wherein there is shown and described a preferred embodiment of this invention, simply by way of illustration of one of the best modes best suited for to carry out the invention. As it will be realized, the present invention is capable of other different embodiments and its several details are capable of modifications in various obvious aspects all without from the invention. Accordingly, the drawing and descriptions will be regarded as illustrative in nature and not as restrictive. 
     While the present invention would typically be implemented in both hardware and software, as those skilled in the art can readily appreciate, the present invention may be implemented in either hardware or software, or a combination thereof. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The accompanying drawings incorporated in and forming a part of the specification, illustrate several aspects of the present invention, and together with the description server to explain the principals of the invention. In the drawings: 
         FIG. 1  is an example of a wireless wide area network; 
         FIG. 2  is an example of a block diagram of a wireless wide area network print server architecture; 
         FIG. 3  is a block diagram of a wireless wide area network client architecture; 
         FIG. 4  is a flow chart of a printer server operation; 
         FIG. 5  is a flow chart of a method for using a wireless client with the present invention; 
         FIG. 6  is a flow chart of an implementation of the dialup wireless wide area network print server; and 
         FIG. 7  is a block diagram representation of data flow received by an image receiver to an image output system; 
     
    
    
     These and additional embodiments of the invention may now be better understood by turning to the following detailed description wherein an illustrated embodiment is described. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention is directed to a system and method for printing from a mobile client device to a wireless wide area network printer utilizing three different interfaces. Although the present invention is described as enabling a mobile client device to communicate with a wireless wide area network printer using a Bluetooth wireless personal area network, an IEEE 802.11x wireless local area network and a cellular based wireless wide area network, it will be appreciated by those skilled in the art that the present invention is also suitably designed to incorporate any other wireless communication channels, such as HomeRF, infrared, or other electronic communication means. Throughout this description, the preferred embodiment and examples shown should be considered as exemplars, rather than limitations, of the present invention. 
     When printing to an image output system, such as a printer, printer/copier, or multifunction peripheral there are two types of print requests, a file print request and a print by reference print request. A file print request may be of two kinds, a regular print where the printer driver on the client side has generated a page description language (PDL) file and a raw file in the format of the application that created the file and now is sent using object exchange (OBEX). A print by reference request entails the user sending either a file to be printed or the uniform resource locator (URL) of the server where the document resides. 
     Referring first to  FIG. 1 , there is shown an example of a wireless wide area network  100  contemplated by the present invention. A server referred to as a controller  108  is operatively coupled to an image output system  110 . The controller  108  is connected to mobile clients over a dialup wireless connection  112 , an IEEE 802.11x connection  114 , or a Bluetooth connection  116 . The mobile clients comprise a cellular phone  102 , a notebook computer  104  and a personal data assistant  106 . The connection between the personal data assistant  106 , the notebook computer  104  or the cellular telephone  102  and the controller  108  may also be over a wired local area network or even directly connected to the image output system  110  via a parallel port, Universal Serial Bus, or other physical connection. In the preferred embodiment, the connection between the controller  108  and the mobile client device  102 ,  104  or  106  is a wireless wide area connection. 
     Referring now to  FIG. 2 , there is shown an example of a block diagram of a print server architecture  200  employing a dialup connection with a mobile client device. The fax/modem  202  establishes a connection with a mobile client device, wherein a controller  210  verifies the mobile client device is authorized to access the print server architecture  200  and utilize the image output system. The fax/modem  202  is communicatively coupled to a spooler  204 , which is responsible for receiving the print request or file from the mobile client device. The spooler  204  is coupled to a document format converter  206  and a print by reference processor  208 . The document format converter  206  and the print by reference processor  208  are connected to the controller  210 , which receives a file from either the document format converter  206 , the print by reference processor  208 , or both. The file is then stored in a queue  212 , until such time as the converter  210  sends the file to the engine  214 , wherein the engine  214  is an image output system. 
     Referring now to  FIG. 3 , there is illustrated a block diagram example of a wireless wide area network print client architecture  300 . As shown, two primary methods for initiating a print command are shown, an application  302  or a browser  304 . The application  302  allows a user to initiate a print command by sending the print file via means of the print driver  306  to the communications means being utilized by the client device of the user. Such communications means, as shown, include, but are not limited to, a Bluetooth transceiver  310 , an IEEE 802.11x transceiver  312  or a wireless fax/modem  314 . Similarly, if the user initiates a print command from the browser  304 , the mobile client device determines the print by reference  308  location of the requested document and proceeds to send the file for printing via means of the Bluetooth transceiver  310 , the IEEE 802.11x transceiver  312  or the fax/modem  314 . 
     In  FIG. 4 , there is illustrative a flow chart for printing from a mobile client device as enacted by the server portion of the present invention. The system starts at step  402 . At step  404 , the system is waiting for a connection and determining if the connection is made. When the connection is made, the system then determines if the connection established in step  404  is a dialup connection per step  406 . When step  406  determines that the connection established in step  404  is not a dialup connection, the system proceeds to step  408  wherein the system determines if the connection established in step  404  is a Bluetooth personal area network or 802.11x local area network wireless connection. Step  410  occurs when step  408  determines that the connection is not a Bluetooth or 802.11x wireless connection. At step  410 , the system determines that the connection established between a mobile client device and the server is a wired local area network connection. Upon the establishment of a wired local area network connection, the system proceeds in step  428  to process the print request as normal. This would typically involve receiving the file to be printed and the converting the file to a printable format in step  438 . Once the file is converted to the printable format of step  438 , the file is then printed in step  440 . Step  440  involves transmitting the converted file to the image output system, where in the present embodiment, the file is printed. The process is completed in step  442 . 
     An alternative option occurs in step  406  when the connection is determined to be a dialup connection. The system proceeds to establish that the mobile client device is a wireless wide area network client in step  412 . A determination that the mobile client device is not a wireless wide area network client in step  412  prompts the system to step  416 , wherein the connection is disconnected in step  436 . Provided the mobile client device is a wireless wide area network client in step  412 , the mobile client device and the server begin authenticating  414 , wherein the system determines the mobile client device is authorized to request a print job. The system then interprets the print type in step  418 . Step  420  allows the system to progress to deciding if the print type is a print by reference request. If the print type is not a print by reference request, the system then proceeds to steps  428 ,  438  through  442 . 
     As discussed above, if the print type denotes a print by reference request, the system then proceeds via  424  to step  430 , wherein a document server containing the requested print job is located. Upon locating the document server in step  430 , the system then downloads the requested print job in step  432 . The requested print job downloaded from the document server is then processed in step  434  to establish the print job is in a supported format. If the print job is not in a supported format, the system proceeds to step  436  whereby the connection is terminated. Upon the system determining the print job is in a supported format in step  434 , the system proceeds to steps  438 - 442 , and the document is printed. 
     An alternative option is presented when the system determines in step  408  that the connection established between the mobile client device and the server is a Bluetooth or 802.11x connection. The system then proceeds to step  426  wherein the proper protocol is used to extract the print control data of the print request from the user. Once the print control data is extracted from the print request, the system then interprets the print type in step  418 . The print type may be a print by request or a normal file print. Step  420  provides for the system to determine if the print request is a print by reference or normal print request. If the print request is a normal print request, the system proceeds via  422  to step  428 . The file is then converted to a printable format in step  438  and sent to the image output system for printing in steps  440  and  442 . 
     A print by reference request in step  420  proceeds via  424  to step  430 , wherein a document server is located. Once the system has located the document server in step  430 , the requested file is downloaded in step  432 . The downloaded file of step  432  is then determined to be in a supported format in step  434 . When the downloaded file is not in the supported format of step  434 , the system proceeds to step  436  whereby the connection with the client device is terminated. A supported format of step  434  is then converted to a printable format in step  438 . The system then progresses to transmit the printable format file to the image output system in step  440  and conclude the operation. 
     In  FIG. 5 , there is illustrated a flow chart representing a method for printing from a client device as enacted by the client side of the present invention. The system starts at step  502 . At step  504 , a user initiates a print command on the mobile client device. The print command may be initiated through an application, a specific user interface or a typical browser. The user is then prompted to select an image output system in step  506 . Upon the selection by the user in step  506 , the mobile client device then determines in step  508  if the image output system is a local area network image output system. 
     If at step  508  it is determined that the selected printer is a Local Area Network (LAN) printer, processing proceeds to step  514  where it is determined whether the selected printer is a wired printer. If at step  514  it is determined that the printer is not a wired printer, then processing proceeds to step  516  whereupon the Wireless LAN is used to connect to the printer. If at step  514  it is determined that the printer is a wired LAN printer, then at step  524  the printer driver is used to send print data to the printer. 
     If at step  508  it is determined that the selected printer is not a LAN printer, then at step  510  it is determined if the selected printer is a Bluetooth printer. If the selected printer is a Bluetooth printer, then processing continues to step  514  wherein the Bluetooth stack is used to connect to the printer and then at step  524  the printer driver is used to send print data to the printer. 
     If at step  510  it is determined that the selected printer is not a Bluetooth printer, then at step  512  it is assumed that the printer is a dial up remote printer. Processing then proceeds to step  520  wherein the client dials up to a WWAN enabled printer and then at step  522  the dial up connection is used to connect to the printer. At step  524  the printer driver is used to send print data to the printer. 
     It should be noted that the print data submitted to the server in steps  524 - 526  may be either a normal print operation, wherein the file originates from the mobile client device or a print by reference request, wherein the file is stored on a document server. 
     In  FIG. 6 , there is illustrated a method for the server to process a dialup request from a mobile client device. The system starts at step  602 . At step  604 , the server determines that a dialup connection is established with the mobile client device. Authentication of the mobile client device occurs in step  606 , whereby the server determines that the mobile client device is authorized to use the wireless wide area network image output system. The system progresses to step  608  when the server determines that the dialup request is a file print request. Provided step  612  determines that the print request is a regular print request, the process moves on to generate a Page Description Language (PDL) file in accordance with step  616 . The PDL file is then sent via  618  to step  634  wherein the PDL file is sent to the spooler of the controller. Once the PDL file arrives at the spooler in step  634 , the file is then raster image processed in step  636 . The raster image processed document is then ready for printing in steps  638  and  640 . 
     An alternative option is presented in step  608  when the dialup print request is determined to be a print by reference request, as shown in step  620 . Step  610  denotes the transition to step  620  wherein the print by reference request is determined. Upon completion of step  620 , step  622  instructs the server to extract the URL of the document requested. The server then connects to the document server in step  624  where the document requested is stored. The server downloads the requested file in step  626  and proceeds via  614  to step  628 . 
     After downloading the file in accordance with the print by reference request, the server then executes step  628 , which determines whether the requested file is raw print data. When the filed downloaded in step  626  is already in PDL format, the system progresses from step  628  to  632  for affirming the format of the downloaded file. A PDL format in step  632  results in sending the PDL file downloaded from the document server in step  626  to the spooler in step  634  via transition  618 . The PDL file is then raster image processed in step  636  and printed in steps  638  and  640 . 
     Returning to step  628 , if the server determines that the print by reference file downloaded in step  626  is raw print data, the file proceeds to step  630 , wherein the raw print data is sent to either a file converter or application server for conversion into the PDL format of step  632 . The PDL file is then sent via  618  to step  634  wherein the PDL file is sent to the spooler of the controller. Once the PDL file arrives at the spooler in step  634 , the file is then raster image processed in step  636 . The raster image processed document is then ready for printing in steps  638  and  640 . 
     A further alternative option is presented when the dialup print request is determined not to be a regular file print in step  612 . The print request is then forwarded from step  612 , via transition  614 , to step  628  where the system analyzes the print request and identifies the print request as constituting raw print data. Since the raw print data constituting the print request must undergo conversion to PDL before progressing the print request, the raw print data is sent to a file converter or application server for conversion to PDL format in step  630 . Once converted, the PDL file is then sent via  618  to step  634  wherein the PDL file is sent to the spooler of the controller. Once the PDL file arrives at the spooler in step  634 , the file is then raster image processed in step  636 . The raster image processed document is then ready for printing in steps  638  and  640 . 
     Referring now to  FIG. 7 , there is illustrated a block diagram of the image output system. Typically, the image output system  714  would comprise a printer, but need not be so limited. Other types of image output systems, including, but not limited to, a copier, a copier/printer, a multifunction printer, are also contemplated by the present invention. A data stream  702 , as contemplated herein, may comprise any number of different types of data, such as a document, a file, an image, a graph, a chart, or a URL denoting the location of the file or document. As shown in  FIG. 7 , the data stream  702  may be received by any of the 802.11x interface card  704 , the Bluetooth interface card  706 , or the dialup interface card  708 , depending upon the type of data stream being sent. For example, if the data stream  702  were transmitted over a Bluetooth communications channel, the Bluetooth interface card  706  would receive the incoming data stream  702 , while the 802.11x interface card  704  and the dialup interface card  708  would not receive any of the incoming data stream. The interface cards  704 ,  706  and  708  are incorporated into the image receiver allowing for the integration of the three different wireless technologies. 
     Routing means  710  is operatively coupled to the 802.11x interface card  704 , the Bluetooth interface card  706  and the dialup interface card  708 . Routing means for sending a signal through a system are well known in the art. 
     In one embodiment, the routing means  710  receives input from all three interface cards  704 ,  706  and  708  and determines when a data stream  702  comprising a file is being received. Upon receipt of the data stream  702  by the routing means  710 , the apparatus provides for sending the data stream  702  to the controller  712 . The controller  712  is equipped to interpret the data stream  702  received by the interface cards  704 ,  706  and  708 . For example, a Toshiba Controller GL1010 or GL1020 may accomplish this action, but any controller known in the art for network printing would suffice. The controller  712  processes the data stream  702 , extracting a URL of a file to download, a file to send to an application server or converter, or a document. The controller  712  is operatively coupled to the image output system  714 . The controller  712  will forward the print data, either extracted directly from the data stream  702  or received from a document server, to the image output system  714  for printing. 
     In another embodiment, the routing means  710  is capable of receiving data from a plurality of the 802.11x interface card, the Bluetooth interface card, or the dialup interface card. In this embodiment, a multi-threaded processor with multiple queues may store data from any combination of the interface cards simultaneously and upon completion of receipt of the data stream, forward the data stream to the controller  712  for processing. 
     The foregoing description of a preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiment was chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of the ordinary skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance to the breadth to which they are fairly, legally and equitably entitled.

Technology Classification (CPC): 7