Abstract:
A dual mode terminal having a communication module controlled by a message, communication system for communicating with a dual mode terminal, and method for controlling a dual mode terminal are disclosed. In a dual mode terminal capable of communicating with a cellular network and a supplementary service network, and wherein the cellular network communicates with the supplementary service network, the present invention includes a first communication module providing a control signal to activate a second communication module for communicating with the supplementary service network responsive to a first message received from the cellular network. While inactive, the second communications module does not consume power nor interfere with communications of the first communications module.

Description:
CROSS-REFERENCE TO RELATION APPLICATION  
       [0001]     This application claims the benefit of the Korean Patent Application No. 10-2005-0070645, filed on Aug. 2, 2005, which is hereby incorporated by reference as if fully set forth herein.  
       BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     The present invention relates to a dual band dual mode terminal, and more particularly, to a dual mode terminal having a communication module controllable by a message. Although the present invention is suitable for a wide scope of applications, it is particularly suitable for reducing unnecessary power consumption of a dual mode terminal and for minimizing interference between communication modules.  
         [0004]     2. Discussion of the Related Art  
         [0005]     Generally, a dual band dual mode (DBDM, called ‘dual mode’) terminal means a terminal that supports two communication systems of differing bandwidth. The dual mode terminal consists of a mobile communication modem communicating with a cellular network (principally performing voice communications) and a communication module communicating with a supplementary service network.  
         [0006]     A mobile communication network, a cellular network, is primarily dedicated to voice communications using GSM, IS-95 CDMAT IMT-2000, WCDMA, or similar technologies. As mobile communication systems evolve into the newer generations, various services such as large-scale multimedia transfer are enabled and offered in addition to voice communication.  
         [0007]     The supplementary service network may be portable Internet (WiBRO, WiMAX), digital broadcasting, wireless LAN (Wi-Fi) or the like. The supplementary service network differs from the cellular network by using different bandwidths. To provide service from the supplementary service network, a terminal requires a separate communication module for communications with the supplementary service network.  
         [0008]     Satellite digital multimedia broadcasting (SDMB) has been commercialized in 2005 and terrestrial digital multimedia broadcasting (TDMB) is on the verge of being commercialized as well.  
         [0009]     TDMB can transmit various kinds of multimedia information such as digital audio, digital video, and digital data using a personal portable terminal or moving vehicle terminal. SDMB is a service that can transmit the various kinds of multimedia information using a broadcasting satellite or communication satellite.  
         [0010]     Various application services are available for digital broadcasting including a TPEG (Transport Protocol Experts Group) service providing real-time traffic information, a GPS service acquiring a position of a vehicle or person by measuring three points using a satellite, an MP3 service providing music by interconnecting an MP3 player to a CD-level audio signal transferred to a portable or vehicle DMB receiver, a slide show service sending a still image of JPEG, an R-commerce service, or a BWS (broadcasting website) service.  
         [0011]     A portable Internet service that utilizes 2.3 GHz band is defined as a service enabling a high-speed wireless Internet access at any time or at any place using a portable Internet terminal. The portable Internet services are classified into (a) real-time services like video streaming, audio streaming, and interactive games, (b) non-real-time services allowing a transmission delay like file transmission, multimedia mail, chafting, e-commerce, and (c) best effort services allowing a transmission delay like web-browsing, or e-mail. Moreover, the portable Internet service supports interconnecting with various kinds of conventional wireless data networks (wireless LAN, mobile communication data network).  
         [0012]     Standardization of WiMAX (worldwide interoperability for microwave access) (a service developing from a conventional wireless LAN) is in progress. Various communication providers including Intel Corp. participate in WiMAX standardization. WiMAX may use a bandwidth of 2.4 or 2.5 GHz.  
         [0013]     In order to provide services from the conventional cellular network and the supplementary service network to a single terminal, a communication module capable of communicating with the cellular network and another communication module capable of communicating with the supplementary service network are simultaneously needed. In particular, using a dual mode terminal, a voice communication is normally conducted via CDMA, GSM and the like. The dual mode terminal can use various supplementary services provided by the supplementary service network such as web surfing, VoD, MoD, VT (video telephony), FTP, broadcasting, or multicasting service.  
         [0014]     However, in general the communication module for communicating with the cellular network for the main purpose of voice communications normally needs to be active for receiving incoming calls. If the communication module for communicating with the supplementary service network is active, power is unnecessarily consumed while a supplementary service is not provided.  
         [0015]     Moreover, if the supplementary service communication module remains active while a service is not provided, interference with the cellular network communication module may occur to interrupt data transmissions.  
       SUMMARY OF THE INVENTION  
       [0016]     Accordingly, the present invention is directed to a dual mode terminal having a communication module activated by a message that substantially obviates one or more problems due to limitations and disadvantages of the related art.  
         [0017]     An object of the present invention is to provide a dual mode terminal having a communication module controlled by a message in which a supplementary service communication module is active only while a service is being provided and by which unnecessary power consumption can be prevented.  
         [0018]     Another object of the present invention is to provide a dual mode terminal having a communication module controlled by a message in which a supplementary service communication module is deactivated while a service is not provided by the supplementary service network thereby eliminating interference with a cellular network communication module.  
         [0019]     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.  
         [0020]     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a dual mode terminal is provided having a communication module controlled by a message and is capable of communications with a cellular network and a supplementary service network. The dual mode terminal includes a first communication module providing a control signal to control communications with the supplementary service network according to a first message received from the cellular network and a second communication module performing communications with the supplementary service network after having been activated according to the control signal.  
         [0021]     Preferably, the control signal is either a reset signal (RESET) or a power-on signal (POWER_ON) provided to the second communication module.  
         [0022]     Preferably, the first communication module transfers a second message to the cellular network indicating that the second communication module has been activated and communications with the supplementary service network have been established.  
         [0023]     Preferably, the first message includes information instructing the dual mode terminal to activate the second communication module for a service previously registered to the supplementary service network.  
         [0024]     More preferably, the first message is a message by a short message service (SMS).  
         [0025]     Preferably, the supplementary service network is a portable Internet network and the second communication module is capable of communicating with the portable Internet network.  
         [0026]     Preferably, the supplementary service network is a digital broadcast network and the second communication module is a digital broadcast modem capable of receiving digital broadcasting from the digital broadcast network.  
         [0027]     Preferably, the supplementary service network is a wireless LAN and the second communication module is capable of communicating with the wireless LAN.  
         [0028]     In another aspect of the present invention, a communication system for a communication module control of a dual mode terminal by a message includes a supplementary service network transferring a first message. The first message includes information about a service for a specific dual mode terminal. The cellular network transfers a second message information to the dual mode terminal according to the first message received from the supplementary service network. The dual mode terminal performs communications with the supplementary service network for the service according to the second message received from the cellular network.  
         [0029]     In another aspect of the present invention of controlling a communication module by a message using a dual mode terminal, a method of controlling a dual mode terminal communication module includes receiving a first message from a cellular network by a first communication module, wherein the first message includes information about a service of a supplementary service network, and communicating with the supplementary service network according to the first message using a second communication module.  
         [0030]     Preferably, communicating with the supplementary service includes providing a control signal activating the second communication module from the first communication module according to the first message, and activating the second communication module thereby communicating with the supplementary service network.  
         [0031]     More preferably, the control signal is either a reset signal (RESET) or a power-on signal (POWER_ON) for the second communication module.  
         [0032]     More preferably, the method further includes providing a second message to the cellular network from the first communication module indicating the second communication module has been activated.  
         [0033]     Preferably, the first message is a message by a short message service (SMS).  
         [0034]     Preferably, the supplementary service network is a portable Internet network and the second communication module is capable of communicating with the portable Internet network.  
         [0035]     Preferably, the supplementary service network is a digital broadcast network and the second communication module is capable of receiving digital broadcasting from the digital broadcast network.  
         [0036]     Preferably, the supplementary service network is a wireless LAN and the second communication module is capable of communicating with the wireless LAN.  
         [0037]     In another aspect of the present invention, a method is provided for controlling a communication module of a dual mode terminal by a message, the method includes transferring a first message having information about a service for a specific dual mode terminal from a supplementary service network, transferring a second message having information to the dual mode terminal according to the first message from the cellular network, and communicating with the supplementary service network for a service according to the second message received by the dual mode terminal.  
         [0038]     Preferably, the method further includes transferring a first response message in response to the second message to the cellular network from the first communication module of the dual mode terminal and transferring a second response message to the supplementary service network notifying that a communication preparation for the service is completed.  
         [0039]     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0040]     The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:  
         [0041]      FIG. 1  is a block diagram of a communication system in which a communication module controls a function of a dual mode terminal by a message according to the present invention;  
         [0042]      FIG. 2  is a flowchart of information transferred within a communication system according to the present invention;  
         [0043]      FIG. 3  is a flowchart of a communication module control method of a dual mode terminal by a message according to the present invention; and  
         [0044]      FIG. 4  is a flowchart of a communication module control method of a dual mode terminal by a message according to the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0045]     Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.  
         [0046]      FIG. 1  is a block diagram of a communication system in which a communication module controls a function of a dual mode terminal by a message according to of the present invention.  
         [0047]      FIG. 2  is a flowchart of information transferred within a communication system according to the present invention.  
         [0048]     A communication system having a communication module control function of a dual mode terminal by a message according to the present invention and a dual mode terminal having a communication module control function by a message according to the present invention are explained with reference to  FIG. 1  and  FIG. 2  as follows.  
         [0049]     A communication system according to the present invention includes a supplementary service network  100 , a cellular network  110  and a dual mode terminal  120 .  
         [0050]     The dual mode terminal  120  includes a first communication module  123  for communicating with the cellular network  110  and a second communication module  125  for communicating with the supplementary service network  100 .  
         [0051]     The cellular network  110  means a mobile communication network having a main purpose of voice communications and may correspond to one of GSM, IS-95 CDMA, IMT-2000 and WCDMA systems. The cellular network  110  has a server for a short message service (SMS) or a multimedia messaging service (MMS) to transmit a message to the dual mode terminal  120 .  
         [0052]     The supplementary service network  100  communicates with the cellular network  110 , and the supplementary service network  100  corresponds to one of a portable Internet network, a digital broadcast network, a wireless LAN and the like. In particular, the portable Internet network or the wireless LAN is a network that can provide various services to a user by communicating with wired Internet (public IP network). In this case, the second communication module  125  of the dual mode terminal  120  is a module capable of communicating with the portable Internet network, receiving digital broadcasting from a digital broadcast network, or communicating with a wireless LAN.  
         [0053]     Digital broadcasting may correspond to European DAB (digital audio broadcasting) based on Eureka-147, DVB-T (digital video broadcasting-terrestrial), DVB-H (digital video broadcasting-handheld), Media FLO (forward link only) by Qualcomm Corp, Korean DMB (digital multimedia broadcasting) or the like.  
         [0054]     The portable Internet corresponds to WiBRO (wireless broadband Internet) or WiMAX (worldwide interoperability for microwave access) IEEE 802.16e as a representative standard of WiMAX.  
         [0055]     Moreover, wireless LAN is a communication system according to IEEE 802.11.  
         [0056]     A user of the dual mode terminal  120  can register for a specific service on the supplementary service network  100 . To register for a service, the supplementary service network can be accessed using the dual mode terminal  120  or another terminal accessible to the supplementary service network  100 . Examples of services that can be registered on the supplementary service network  100  by the user of the dual mode terminal  120  are explained in detail as follows.  
         [0057]     If the supplementary service network  100  is a digital broadcast network, the user can register to receive a broadcast in a specific time zone, or a broadcast of a specific program from the digital broadcast network. If the supplementary service network  100  is a portable Internet network or a wireless LAN, advance registrations may be made for various services including streaming service of a specific VoD (video on demand) or MoD (music on demand), a voice or video call via VoIP (voice on Internet protocol) service or VT (video telephony), a broadcast or multicast service provided by the supplementary service network  100 .  
         [0058]     The advance registrations or reservations are not limited to the above-illustrated examples; other services provided by the supplementary service network  100  can be registered by the user may be included in the examples of the advance registrations.  
         [0059]     The supplementary service network  100  transfers a first message  200  having information about service for the dual mode terminal  120  to the cellular network  110 . Preferably, the information about the service is information previously registered or registered in the above-explained manner. More preferably, the information about the service can be the information indicating that the second communication module  125  shall be activated for communication of the previously registered service. Moreover, the first message  200  can include identification information that can identify the dual mode terminal  120  or the user of the dual mode terminal  120 .  
         [0060]     The cellular network  110  transfers a second message  210  having the information about service to the dual mode terminal  120  according to the first message  200  received from the supplementary service network  100 . The cellular network  110  transfers the second message  210  to the dual mode terminal  120  using the identification information included in the first message  200 . In this case, the detailed features of the information about the service included in the second message  210  are like those explained in the above description. Preferably, the second message  210  can be a SMS or MMS message.  
         [0061]     The cellular network  110  converts the first message  200  to the second message  210  to transfer to the dual mode terminal  120 , This is because a communication system between the supplementary service network  100  and the cellular network  110  differs from a communication system between the cellular network  110  and the dual mode terminal  120 .  
         [0062]     The dual mode terminal  120  activates the second communication module  125  to communicate with the supplementary service network  100  for the service according to the second message  210 . Preferably, the first communication module  123  parses the received second message to provide a control signal  220  for controlling the communication with the supplementary service network  100  according to a request made by the supplementary service network  100 . The second communication module  125  is activated according to the control signal  220  and then communicates with the supplementary service network  100 . Preferably, the control signal  220  may be a reset signal (RESET) or power-on signal (POWER_ON) for the second communication module  125 .  
         [0063]     The dual mode terminal  120  transfers a first response message  230  for the second message  210  to the cellular network  1   10  via the first communication module  123 . The first response message may include a notification that the second communication module is ready to communicate with the supplementary service network  100 . The cellular network  110  converts the first response message  230  received from the dual mode terminal  120  to a second response message  240  complying with a communication system between the cellular network  110  and the supplementary service network  100  and then transfers the second response message  240 . The supplementary service network  100  having received the second response message  240  from the cellular network  110  communicates with the dual mode terminal  120  via the second communication module  125  for the requested service.  
         [0064]      FIG. 3  is a flowchart of a communication module control method for a dual mode terminal by a message according to the present invention showing a communication system.  
         [0065]      FIG. 4  is a flowchart of a communication module control method of a dual mode terminal by a message according to the present invention showing a dual mode terminal.  
         [0066]     A dual mode terminal communication module control method by a message according to the present invention is explained with reference to  FIG. 3  and  FIG. 4  as follows.  
         [0067]     First a supplementary service network  100 , communicating with the cellular network  110  transfers a first message having information about service for a specific dual mode terminal  120  to the cellular network  110  (S 300 ). The detailed features of the cellular network  1101  the supplementary service network  100 , the dual mode terminal  120  and the first message are explained in the foregoing description.  
         [0068]     Subsequently, the cellular network  110  transfers a second message including the information about the service offer to the dual mode terminal  120  according to the first message (S 310 ). In this case, the detailed features of the second message are explained in the foregoing description.  
         [0069]     The dual mode terminal  120  activates a communication module for communications with the supplementary service network  100  according to the second message (S 320 , S 420 ) and then communicates with the supplementary service network  100  (S 350 , S 440 ) for the service. Preferably, a first communication module  123  receives the second message (S 400 ) and provides a control signal for activating a second communication module  125  for communications with the supplementary service network  100  according to a request made by the supplementary service network  100  by parsing the second message (S 410 ).  
         [0070]     In doing so, the dual mode terminal  120  transfers a first response message to the cellular network (S 330 , S 430 ) and the cellular network  110  transfers a second response message to the supplementary service network  100  (S 340 ). The supplementary service network  100  receives the second response message and recognizes that the dual mode terminal  120  is ready to communicate. The supplementary service network  100  then communicates with the dual mode terminal  120  (S 350 , S 440 ).  
         [0071]     Other detailed features for the implementation of the communication module control method of the dual mode terminal by the message according to the present invention are like those explained in the foregoing description.  
         [0072]     As is apparent from the above description, a dual mode terminal having a message control a communication module by a message, has the following advantages.  
         [0073]     First, a dual mode terminal according to the present invention can prevent unnecessary power consumption because a communication module for communicating with a supplementary service network is activated only while a service is provided by the supplementary service network.  
         [0074]     Second, a dual mode terminal according to the present invention can prevent interference between a cellular network communication module and any other supplementary service network communication module, because the supplementary service network communication module is deactivated while a service is not provided by the supplementary service network.  
         [0075]     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.