EP0882376A2 - Envoi d'images graphiques a des terminaux mobiles - Google Patents

Envoi d'images graphiques a des terminaux mobiles

Info

Publication number
EP0882376A2
EP0882376A2 EP97905955A EP97905955A EP0882376A2 EP 0882376 A2 EP0882376 A2 EP 0882376A2 EP 97905955 A EP97905955 A EP 97905955A EP 97905955 A EP97905955 A EP 97905955A EP 0882376 A2 EP0882376 A2 EP 0882376A2
Authority
EP
European Patent Office
Prior art keywords
data
mobile terminal
character based
binary data
messages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97905955A
Other languages
German (de)
English (en)
Inventor
Eric Lee Valentine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Inc
Original Assignee
Ericsson Inc
Ericsson GE Mobile Communications Holding Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc, Ericsson GE Mobile Communications Holding Inc filed Critical Ericsson Inc
Publication of EP0882376A2 publication Critical patent/EP0882376A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/7243—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality with interactive means for internal management of messages
    • H04M1/72439—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality with interactive means for internal management of messages for image or video messaging

Definitions

  • the present invention relates to a digital mobile telecommunications system and, in particular, to the transmission of graphic images for display by a mobile terminal within a digital mobile telecommunications system.
  • a telephone directory number along with a name or label for the party can be stored within a memory device residing in a mobile terminal . Whenever the user wishes to communicate with that particular number, the user can browse the memory and select the pre-stored name for communication.
  • GSM Global System for Mobile
  • PCS Personal Communications System
  • USSD Unstructured Supplementary Services Data
  • PLMN Public Land Mobile Network
  • An example of an USSD application comprises a subscriber feature management system.
  • a mobile subscriber may have subscribed to a number of special subscriber features, such as Call Forwarding, Call Waiting, and Speed Dialing.
  • the user has to dial the operator or the exchange providing the features and manually activate, deactivate, or modify the features by either speaking with an operator or dialing a series of service codes and subsequently needed subscriber information.
  • GSM or PCS a user merely has to pull up a menu on the liquid crystal display
  • LCD liquid crystal display
  • the mobile terminal then automatically transmits the updated information via USSD messages toward the PLMN to actually update the state of the selected feature.
  • USSD application comprises concurrently communicating user inputted character data while a user is in speech with another party. These data might comprise directions to a restaurant, advertisements, or other text messages for subscriber consideration while continuing with a speech communication over the separate voice channel .
  • GSM or PCS system One known deficiency with the above GSM or PCS system is its inability to transport graphic images such as still pictures, moving pictures, or fax images to a mobile terminal. This is because the USSD is a character based message system. It is standardized to transport character data between a mobile terminal and a PLMN. Graphic images or fax materials instead comprise binary data or bit data which are incompatible with a character based format.
  • GSM or PCS In order to communicate graphic images to a mobile terminal, one solution would be to introduce a different transport mechanism or standards.
  • GSM or PCS the purpose of GSM or PCS is to standardize the networking environments and protocols to enable mobile users to freely travel and communicate over a number of different mobile telecommunications systems. Therefore, any new protocol or standard must be reviewed and approved by all of the participants in the GSM or PCS environment (or committee) . Because the current GSM or PCS standard is the result of long and arduous negotiations between a number of different providers or countries, it is unlikely that a new protocol or mechanism to handle graphic images could be timely developed.
  • the present invention advantageously provides a system for transporting graphic images to a mobile terminal associated with a mobile telecommunications system using a character based message system.
  • the binary data representing a graphic image are converted into a character based format.
  • the converted character based format data are then encapsulated within character based format messages and transported over to the mobile terminal via a non-traffic communications channel.
  • the mobile terminal reconverts the received character based format data to the original binary data and processes the data for display.
  • the present invention includes a method and apparatus for transporting graphic images to a mobile terminal by utilizing Unstructured Supplementary Service Data (USSD) messages.
  • USB Unstructured Supplementary Service Data
  • the present invention includes a method and apparatus for transporting graphic images to a mobile terminal by utilizing Short Message Service (SMS) messages.
  • SMS Short Message Service
  • the present invention includes a method for converting binary graphic image data to character based data and for transporting the data via USSD or SMS messages.
  • the present invention discloses a system where a server application converting binary graphic image data to character data is located within a mobile switching center (MSC) serving a particular mobile terminal .
  • MSC mobile switching center
  • the present invention discloses a system where a server application converting binary graphic image data to character data is located within a home location register associated with a MSC serving a particular mobile terminal.
  • the present invention discloses a system where a server application converting binary graphic image data to character data is located within an external node associated with a home location register serving a particular mobile terminal.
  • the present invention discloses a system where received character based messages are reconverted back to the original binary graphic image data and processed for display by the mobile terminal .
  • FIGURE 1 is a block diagram illustrating the communication of Unstructured Supplementary Services Data (USSD) messages between a mobile switching center (MSC) and a mobile terminal;
  • USSD Unstructured Supplementary Services Data
  • FIGURE 2 is a block diagram illustrating the data format of a USSD message
  • FIGURE 3 is a block diagram illustrating the data format of Graphics Interchange Format (GIF) data
  • FIGURE 4 is a block diagram illustrating the overview layout of the conversion process for encapsulating binary graphic image data into USSD messages
  • FIGURE 5 is a block diagram illustrating the encapsulation of GIF data within an USSD message
  • FIGURE 6 is a block diagram illustrating a server application transmitting graphic images to a client application
  • FIGURE 7 is a block diagram illustrating a server application residing within a MSC serving a particular mobile terminal
  • FIGURE 8 is a block diagram illustrating a server application residing within a home location register serving a particular mobile terminal.
  • FIGURE 9 is a block diagram illustrating a server application residing within an external node connected to a home location register serving a particular mobile terminal .
  • FIG. 1 is a block diagram illustrating the communication of Unstructured Supplementary Services Data (USSD) messages between a mobile terminal 100 and a mobile switching center (MSC) 130.
  • USSD Unstructured Supplementary Services Data
  • MSC mobile switching center
  • Signaling for telecommunication services is normally performed in a structured way. For example, specific predefined data, formats, and signal names are used to setup a speech connection, to perform handovers, and to authenticate subscriber information when providing telecommunications service to a mobile subscriber.
  • GSM Global System for Mobile
  • PCS Personal Communications System
  • a number of new and advanced supplementary services are being provided to mobile subscribers. Since these supplementary services utilize user specified data, there are no structured ways to communicate these data between a Public Land Mobile Network (PLMN) GSM application and a mobile terminal.
  • PLMN Public Land Mobile Network
  • SMS Short Message Service
  • USSD Unstructured Supplementary Service Data
  • USSD or SMS is used when structured, functional signaling is not available for a supplementary service.
  • the USSD protocol for example, provides a transport mechanism for carrying unstructured data (e.g, user specified text data) to and from an application residing within a targeted mobile terminal.
  • unstructured data e.g, user specified text data
  • One example of such a supplementary service is the registration, deletion, activation, or deactivation of subscriber services .
  • Another example is a message service center which interfaces with a mobile telecommunications network for providing text information such as weather information or stock exchange information to mobile subscribers. When a mobile subscriber makes a request toward the message service center using an USSD message, the message service center provides the requested information back to the mobile terminal also via USSD messages.
  • An external node user 110 where a particular application module resides is responsible for the interaction (signaling procedures) towards the mobile terminal 100.
  • the dialogue between the external node user 110 and the mobile terminal 100 is performed without the conversion of USSD components by the home location register (HLR) 120 or the mobile switching center (MSC) 130 serving the mobile terminal 100.
  • HLR home location register
  • MSC mobile switching center
  • the HLR 120 and the MSC 130 only relay the USSD components between the concerned participants in the above dialogue (the external node user 110 and the mobile terminal 100) without modification.
  • the MSC 130 or the HLR 120 receives a mobile terminal 100 initiated USSD request or external node user 110 initiated USSD request, it passes the request to the USSD handlers 125 and 135.
  • the USSD handler 125 residing within the HLR 120 and the USSD handler 135 residing within the MSC 130 then perform the following tasks to invoke an application or to forward the messages to a proper application: analyze the syntax of the operations and protocol rules; identify the USSD application for incoming mobile terminal initiated USSD operations; - forward the USSD string and the Data Coding
  • FIG. 2 there is shown a block diagram illustrating the data format of an USSD or SMS message 140.
  • the first eight octets 145 are used to specify which language, operation, parameter, data length, and data sequences are being used while the remaining eighty octets 142, if needed, are used to transport character data.
  • USSD and SMS are character based protocols, the contents of the eighty octet data section 142 are displayed without modification. For example, if an ASCII byte representing the letter "c" is transported to a mobile terminal, the letter "c" is displayed at the next print location on the display unit attached to the mobile terminal.
  • a message service center may type a string of characters representing a text message, load the string in the eighty octet data section 142, and transmit the string over to a mobile terminal for display.
  • Graphic image data are structured differently. To display a graphic image, a value for each point or pixel on the screen display is needed.
  • GIF Graphics Interchange Format
  • CompuServe Incorporated An example of a binary format for representing graphic images is the Graphics Interchange Format (GIF) developed by CompuServe Incorporated.
  • GIF is CompuServe's standard for defining generalized raster images and for formatting high-quality, high-resolution graphics to be displayed on various graphics hardware.
  • other formats are also well known in the art .
  • FIG. 3 there is shown a block diagram illustrating the data format 160 of a standard GIF file.
  • the GIF signature data section 162 specifies the GIF version number for the enclosed graphic data.
  • the screen descriptor data section 164 specifies the overall dimensions for the logical screen that is required to display the enclosed graphic data. It further specifies the color mapping information, background screen color, and color depth information.
  • the global color map data section 166 is optional but recommended for images requiring accurate color rendition. More specifically, the global color map data section 166 specifies color intensity for different colors within the color spectrum.
  • the image descriptor data section 168 specifies the actual placement of the enclosed graphic data.
  • the raster data 170 represents the actual image to be displayed.
  • the format of the actual image is represented as a series of color index values. The pixels are sequentially stored from left to right for an image row. A number of image rows ultimately make up a graphic image.
  • An embodiment of the present invention is to transport graphic images stored in a binary data file, such as the aforementioned GIF file, to a mobile terminal by utilizing existing character based protocols such as USSD or SMS.
  • a binary data file such as the aforementioned GIF file
  • USSD or SMS By utilizing USSD messages, no new standard or protocol needs to be introduced or developed to efficiently and accurately transport graphic image data to a mobile terminal.
  • the USSD transport mechanism is a character based protocol, only seven bits out of a byte (a single byte consists of eight bits) may be utilized to carry actual data. The remaining one bit is used for the USSD protocol's own purposes - such as a stop bit or start bit.
  • FIG. 4 is a block diagram illustrating the overview layout of the conversion process of encapsulating binary graphic image data into USSD messages.
  • a stream of binary data within a GIF file 160 are divided up via groups of seven bits 176 and individually reformatted to eight bit bytes 150. The remaining one bit is used for USSD purposes .
  • the reformatted bytes 150 are then encapsulated using USSD messages 140.
  • the header 145 indicates which destination and application module need to receive this character data, and the string section 142 encapsulates the formatted character data. If the GIF file 160 is too large for a single USSD message, a number of USSD messages, as needed, are utilized to separately transport the binary graphic image data.
  • the mobile terminal receives the USSD messages 140, the encapsulated character data are extracted and reconverted to the original GIF file 160. During the process of conversion, appropriate header information 174 and the actual image data 172 for the original GIF file are reassembled.
  • an USSD message 140 is shown encapsulating a GIF file 160 (or part of a GIF file) which has been converted to character based data.
  • a GIF file 160 or part of a GIF file
  • the USSD string section 142 can be utilized to transport converted graphic images 160 without requiring a different transportation mechanism or protocol.
  • FIG. 6 is a block diagram illustrating a server application transmitting graphic images to a client application in accordance with the teachings of the present invention.
  • the server application module 200 is responsible for converting graphic images along with header information into character base data and for transmitting them over to the client application module 200 residing within a mobile terminal.
  • the server application 200 can internally store the subscriber requested information via a database, or it can receive the requested information externally as illustrated by a line 240 representing a graphic image received from, for example, a fax machine. Accordingly, the reception function module 210 within the server application module 200 receives the user requested information from external nodes or retrieves it from internal storage sources, and passes it to the conversion function module 220.
  • the conversion function module 220 takes the graphic image data file, such as a GIF file, and converts the stored binary data along with header information into character based data as described previously. It further loads the converted binary data into a number of USSD messages as necessary to transport the whole GIF file.
  • the USSD messages encapsulating the converted GIF binary data are then sent to the sending function module 230 to be transported to the client application module 300. As described in FIG. 1, these USSD messages are then sent to an USSD handler residing within an HLR or MSC to be physically transported to a mobile terminal.
  • These USSD messages are physically transported separately from the traffic channel (TCH) utilizing a control channel such as Stand-alone Dedicated Control Channel (SDCCH) .
  • TCH traffic channel
  • SDCCH Stand-alone Dedicated Control Channel
  • an USSD handler residing within the mobile terminal forwards the messages to the client application module 300.
  • the reception function module 330 within the application module 300 intercepts the received USSD messages and extracts the encapsulated graphic image data.
  • the extracted data are then sent to the conversion function module 320 which in turn reconverts the character based data back to the original GIF data. This is performed by extracting the seven bit data from an eight bit byte, and rearranging them to represent the original arrays of bit data. While converting the extracted data, the conversion function module 320 first needs to ascertain the format of the encapsulated graphic file.
  • Graphic file formats include, but not limited to: - GIF: Graphics Interchange Format;
  • the conversion function module needs to know which graphic format is used to properly convert the header information along with the rest of the graphic data properly.
  • the variations and number of graphic formats, as illustrated above, are not limited to the aforementioned list.
  • any format can be utilized.
  • the extracted data are converted accordingly back to their original data format .
  • the reconverted GIF or graphic image data are then sent to the user application function module 310 to be displayed on to a display unit 340 attached to or within the mobile terminal.
  • the user application function module 310 might accomplish this display task by feeding the GIF data to a video graphics array (VGA) driver 342 associated with the display unit 340.
  • VGA video graphics array
  • FIG. 7 is a block diagram illustrating a server application 200 residing within a MSC 130 serving a particular mobile terminal 100.
  • the server application module 200 residing within the MSC 130 retrieves or receives the user requested graphic images, and converts the binary data representing the graphic images to USSD compatible character based data. As described in FIG. 6, such converted data are then loaded onto USSD messages and sent to an USSD handler within the MSC 130.
  • the MSC 130 in turn transmits the USSD message to the base station controller 310.
  • the base station controller 310 ascertains the particular base station 300 covering the cell area currently occupied by the mobile station 100, and transmits the USSD message to that particular base station 300.
  • the base station 300 then transmits the USSD message to the mobile terminal 100 over a non-traffic communications channel such as Stand-alone Dedicated Control Channel (SDCCH) .
  • SDCCH is one of the control channels provided by the GSM or PCS network system utilizing the Time-Division Multiple Access (TDMA) technology and is normally used for system signaling during a call set-up before allocation of a traffic channel (TCH) . For example, subscriber registration and authentication take place via SDCCH.
  • TDMA Time-Division Multiple Access
  • the USSD handler within the mobile terminal 100 reviews the USSD header information associated with the received USSD message and determines which application needs to receive the message.
  • the client application module 310 is forwarded the USSD message, and in accordance with the teachings of the present invention, the character based data are extracted and reconverted back to its original binary data format.
  • the reconverted binary data such as a GIF file, are then input into a VGA driver to be displayed onto a LCD unit.
  • SDCCH instead of a traffic channel (TCH)
  • TCH traffic channel
  • FIG. 8 a block diagram illustrating a server application 200 residing within a home location register (HLR) 120 serving the mobile terminal 100 is shown.
  • the server application module 200 can be associated with a number of different nodes within a mobile telecommunications network. For network originated USSD operations, they follow the similar procedures for transmitting graphic images as described in FIG. 7. One difference is that the conversion and encapsulation are performed within the server application module 200 located within the HLR 120 instead of the MSC 130.
  • messages are forwarded to the MSC 130 via the path of the mobile terminal 100 to the base station 300 to the base station controller 310 to the MSC 130.
  • the MSC 130 looks at the header information associated with the received USSD message and determines that the specified application is not recognized.
  • the MSC 130 transmits the unrecognized USSD message to the HLR 120.
  • the HLR 120 determines that the application specified by the header resides within the HLR 120 itself, and forwards the USSD data to the server application module 200.
  • the server application module 200 ascertains and performs the user request contained within the received USSD data.
  • a request for example, may be for a graphic representation of a local map or area.
  • the server application module 200 accordingly retrieves the information internally or receives them from an external source, and transmits the requested graphic image back to the mobile terminal 100 as explained above.
  • FIG. 9 a block diagram illustrating a server application module 200 residing within an external node 400 connected to a home location register 120 serving a mobile terminal 100 is shown.
  • network originated USSD operations they follow the similar procedures for transmitting graphic images as described in FIG. 8.
  • the USSD handlers residing within the HLR 120 and the MSC 130 transparently handle and route the USSD messages generated by the external node 400.
  • messages are forwarded to the MSC 130 via the path of the mobile terminal 100 to the base station 300 to the base station controller 310 to the MSC 130.
  • the MSC 130 again looks at the header information associated with the received USSD message and determines that the specified application is not recognized.
  • the MSC 130 transmits the unrecognized USSD message to the HLR 120.
  • the HLR 120 also looks at the header information associated with the received USSD message and subsequently determines that the specified application also does not reside within the HLR 120 itself.
  • the HLR 120 further transmits the USSD message to the external node 400 that is associated with the HLR 120.
  • the external node 400 lastly looks at the header information specified by the received USSD message and forwards it to the server application module 200 residing within the external node 400 for execution. As described previously, the server application then ascertains and properly performs the user request contained within the received USSD data.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Studio Circuits (AREA)

Abstract

Des données binaires représentant des images graphiques, telles qu'un fichier de format d'échange graphique (GIF), sont converties en données à base de caractères. Ces données converties à base de caractères sont ensuite chargées sur un message de données non structurées de services supplémentaires (USSD) et transportées vers un terminal mobile par l'intermédiaire d'un canal de commande autonome spécial (SDCCH) fourni par le réseau du système global de télécommunications mobiles (GSM) ou personnelles (PCS). Une fois que le message transmis USSD contenant les données converties à base de caractères est reçu par le terminal mobile, les données encapsulées sont extraites et reconverties en données binaires représentant le fichier original GIF. Ce fichier GIF est ensuite introduit dans un circuit de commande d'ensemble graphique vidéo (VGA) afin d'être affiché sur une unité d'affichage à cristaux liquides (LCD) fixée au terminal mobile.
EP97905955A 1996-02-20 1997-02-20 Envoi d'images graphiques a des terminaux mobiles Withdrawn EP0882376A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US60403196A 1996-02-20 1996-02-20
US604031 1996-02-20
PCT/US1997/002328 WO1997030556A2 (fr) 1996-02-20 1997-02-20 Envoi d'images graphiques a des terminaux mobiles

Publications (1)

Publication Number Publication Date
EP0882376A2 true EP0882376A2 (fr) 1998-12-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97905955A Withdrawn EP0882376A2 (fr) 1996-02-20 1997-02-20 Envoi d'images graphiques a des terminaux mobiles

Country Status (5)

Country Link
EP (1) EP0882376A2 (fr)
CN (1) CN1216665A (fr)
AU (1) AU726060B2 (fr)
RU (1) RU2190309C2 (fr)
WO (1) WO1997030556A2 (fr)

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AU2272897A (en) 1997-09-02
RU2190309C2 (ru) 2002-09-27
WO1997030556A3 (fr) 1997-10-16
CN1216665A (zh) 1999-05-12
WO1997030556A2 (fr) 1997-08-21
AU726060B2 (en) 2000-10-26

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