Patent Document

BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to telecommunications. More specifically, the present invention relates to the transfer of multimedia files between two or more devices during a voice call without the need to hang up and call back, via various methods, including connecting multiple cellular devices, a cellular device and a computer, multiple computers, or any other combination of electronic devices having a connection with the internet. 
     2. Background of the Invention 
     Cellular communication is an area of increasing technology and availability. At the end of 2005, a CTIA study showed that 69% of the United States population subscribed to a cellular telephone service. Cellular telephones work on a network of receiving towers that communicate with a central location. These towers are constantly being built in an effort to create a seamless network across the globe. Not only is this market more popular, but the technology is growing. Cellular companies have now opened data pipelines for delivering broadband internet straight to its customer&#39;s phones. 
     As this integration between mobile services and internet services develops, there are many applications that can benefit from the coupling of this trend with increasingly powerful and multi-functional mobile devices. Besides voice audio, the existing infrastructure permits transfer of audio, video, and other multimedia across cellular networks. Uses of this facility could range from transmitting personal photographs between users to sending live video or location information to an E911 operator. 
     As phones become more like computers, users want to exchange more than mere conversations. Most new mobile phones are capable of performing many functions beyond basic telephony. Today&#39;s typical mobile phone is a fusion of a digital camera or camcorder, PDA, and digital music player, with room for add-ons like USB, Firewire, IR, or BLUETOOTH which gives them the ability to communicate with other devices independent of the cellular network. However, these phones are still essentially communication devices. It&#39;s not difficult to combine a digital camera with a music player, but mobile phone manufacturers have stepped up to the additional challenge of being able to integrate this functionality with the need to send and receive voice calls on demand. 
     The next step is to fuse these functions to communicate more than just voice. There exists a lot of potential for new technology and function with an IP-enabled cellular network, which essentially assigns each cellular device an IP address just like a home computer when connected to the internet. This allows communication of pictures, film, and other data objects with any other device on the internet, including a home computer, thereby exploiting the functionality of the phone/camera/mp3 player. There exists an infrastructure that utilizes the availability of fast data-transfer protocols, standardized technologies, increasingly powerful wireless devices. It receives large amounts of investment by cellular operators in ensuring that their networks can implement these technologies. 
     It is the IP-Multimedia System, or IMS, which is essentially a system by which mobile operators can offer and charge for discrete services, that are usually available on the internet, alongside currently offered services. This architecture works with any packet-switching network, and is IP-based. Therefore it has tremendous potential for services like Voice-over IP (VoIP), push-to-talk, videoconferencing, IM, presence information, etc. An example of a standardized signaling protocol is the Session Initiation Protocol, or SIP. SIP allows two devices in a network to find each other and open lines of communication easily, and is a significant part of IMS. 
     However, this existing infrastructure is not being utilized to its fullest potential. Currently, to send multimedia files to another mobile user, one is limited to either using the Multimedia Message Service (MMS), email, or via an instant messaging (IM) program that traverses the IM service provider network. MMS has its share of inconveniences. It cannot be used during a voice call, and MMS technology is fairly proprietary and non-scaleable. Also, the message has to traverse an MMS Center which is a temporary storage center for the message. The message is held there until the receiving device is located. The MMS Center will only hold the message for so long, and it can be unreliable. Email has some disadvantages as well. Though it has been the default option for sending files across the internet, most phones have limited email capabilities, and cannot access internet mail while engaged in a voice call. Sending files over instant messaging is even more burdensome. Both mobile devices must be capable of running IM software, the software must run on the same IM protocol, and the software must have capability of sending and receiving files. Of the popular IM software programs that exist on mobile devices, most of the programs do not support file transfer. 
     What is needed is a method that allows multimedia files to be transferred from one user to another in the midst of a voice call between the two users. The current state of technology forces a user to hang up, send a multimedia file through one of the above mentioned services, like MMS, then call back to see if the transfer was successful. Even if it was successful the transfer might not be instantaneous, requiring both users to pause for an unknown amount of time to allow the MMS Center, email server, or IM server to forward the multimedia file. Although it works, efficiency is the main purpose of having this capability on one&#39;s phone. Most people would rather send the files through their home computer, and know they will reach their destination soon, than try to send the file through their mobile device. 
     Ideally, this process would involve minimal work on the user&#39;s part, allowing software to take care of all the technical negotiations, and efficient employment of the existing infrastructure. When connected to a user in a voice call, the user should not need to know the IP address of the connected device. These devices are already connected via voice, and software should be able to find the IP address without user intervention. 
     SUMMARY OF THE INVENTION 
     The present invention is such a technique of transferring multimedia files from one user to another in the midst of a voice call. While users are connected in the voice call, one user can select on his mobile device to make a direct connection to the other user in order to send a multimedia file to the other user during the call. That user can either accept or reject this offer to make a direct connection by making that selection on her mobile device. If she accepts, the direct connection is opened and these users can send any file to the other, whether it be a picture, sound, movie, or data file, all while still talking through the mobile devices. 
     Furthermore, the present invention works with the forms of communication that network carriers currently have, such as GSM, CDMA, and TDMA networks, and others. This also allows mobile devices to connect to other devices on the internet that may not be cellular telephones, like computers or PDA&#39;s. The direct connection utilized between the two connecting devices can be secured as well using any of the current forms of encryption. 
     In one embodiment of the present invention, two users with cellular telephones on a GSM/GPRS network can send multimedia files to each other while connected in a voice call. So if a proud father is talking to his mother and really wants to send pictures of his new baby to her, he can do so while he is on the phone. The father just establishes a direct connection, and he can then send any multimedia file he wants without having to hang up and call back to make sure the files were received correctly. 
     In another embodiment of the present invention, one user with a cellular telephone on a GSM/GPRS network connects to a computer over the internet using Voice-Over IP or VOIP. This expands the usability of the previous embodiment because both users do not need cellular telephones to make a direct connection. Since the cellular telephone has IMS capability, it easily obtains an IP address that can be seen and used to communicate with by any computer or other device on the internet. This setup works in substantially the same way. Tom calls his mother from his VOIP phone to her cellular telephone and wants to send her pictures of his new baby. He establishes a direct connection in the background and sends over all the pictures he wants while still talking to his mother. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows an overview of the flow of data between two devices connected through both a voice connection and a file transfer session according to an exemplary embodiment of the present invention. 
         FIG. 2  shows the steps to obtaining an IP address for a cellular telephone connecting to IMS according to an exemplary embodiment of the present invention. 
         FIG. 3  shows the steps to establishing a direct PDP connection over a cellular network during a voice call according to an exemplary embodiment of the present invention. 
         FIG. 4  shows the steps to disconnecting the direct connection over a cellular network during a voice call according to an exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention is a technique of sharing files with the person or device that one is connected to in a voice call as shown in  FIG. 1 . This is accomplished by establishing a direct IP connection between the two devices  102 ,  107  that are connected in a voice call  110  without the need for either device to hang up. Once a direct IP connection  126  is established, the users can send files back and forth to each other, such as pictures, sound clips, music, video, or any other file. One such method of making the direct IP connection possible is through the IP Multimedia Subsystem or IMS  106 . 
     IMS  106  is a system by which mobile operators can offer discrete services, usually available on the internet, alongside currently offered services. These services can include music, games, picture downloads, direct multimedia sessions, text messaging, or direct voice connections. An IMS enabled cellular telephone  102  can be assigned an IP address, which other devices on the internet  107  can use to connect to the cellular telephone through gateways  105 . These other devices  107  can be computers, servers, other IMS enabled cellular telephones, or many others. This means a multimedia session between two IMS users, between an IMS user and a user on the Internet, and between two users on the Internet is established using the same protocol. 
     The registration of a cellular telephone with IMS to receive an IP address is shown in  FIG. 2 . The user&#39;s device, or User Equipment, UE  202 , receives its IP address from IMS upon request. From a cellular telephone, this request is first sent from the UE  202  to the nearest tower  203 . The tower  203  then relays the request to a server  204 . The server  204  then makes a connection with the UE  202  where it obtains authentication. Once authenticated, the UE  202  then tries to open a Packet Delivery Protocol, or PDP, connection to the internet to receive an IP address. This request is relayed from the tower  203  to the server  204  and then to a gateway  205 , where the PDP packet is sent to the internet. The internet allocates an IP address and relays that address back through the gateway  205 , server  204 , and tower  203 . The PDP response is received by the UE  202 , which then allows it to send and receive IP datagrams. An IP datagram is a packet of information, which gets translated into a PDP by the gateway  205  before reaching the UE  202 . 
     Prior to the voice call, both of the UE&#39;s  202  are either SIP capable or IMS capable, which means they register to an IMS network and are given an IP address. After registration, the UE&#39;s  202  should be able to perform SIP based calls to each other and communicate with each other using their SIP addresses. 
     The process of setting up the direct connection  326  is illustrated in  FIG. 3 . First, a voice call  310  is initiated between User A  301  and User B  308 . Accompanying the request to set up the voice call  310  can be a request to check the parameters of each of the UE&#39;s  302 ,  307  to determine if they are capable of transferring data between the two. The instruction request  310  would be a request for a voice call and content call request. 
     Once the voice call  310  is setup, an SIP invitation  312  is sent from User A&#39;s UE  302  to User B&#39;s UE  307  inviting User B  308  to the IP address of User A&#39;s UE  302 . User B  308  receives the request in the background, because there is no reason to have guaranteed bandwidth dedicated to it. The invitation  312  travels from User A&#39;s UE  302  to the nearest tower  303  where it is relayed to a server  304 . The server  304  then relays the invitation through a gateway  305  where it is translated into an IP datagram, a form IMS  306  can understand. Once it has been translated IMS  306  finds the IP address of User B&#39;s UE  307 . If IMS  306  is successful in finding the IP address of User B&#39;s UE  307  it sends a message  315  to User A&#39;s UE  302  immediately telling User A  301  that IMS is trying to connect to User B  308 . 
     The invitation is relayed back through the gateway  305 , server  304 , and tower  303  nearest User B&#39;s UE  307  and User B  308  receives the invitation  314  with an option to accept or decline. If User B  308  declines, then the direct connection  326 is dropped but the voice call  310  still continues. If User B  308  accepts, then an acceptance message  317 ,  318  is sent back through the system to User A&#39;s UE  302 . This acceptance message  317 ,  318  not only sends simply the message of acceptance but also tells User A&#39;s UE  302  what type(s) of media it is capable of receiving, such as video, audio, or pictures. The acceptance message  317 ,  318  is followed by a handshake between the two UE&#39;s  302 ,  307  over a primary PDP connection. 
     When User A  301  is ready to send a file, User A  301  selects a file to send from a menu on the device  319 . A message is sent to User B&#39;s UE  307  where User B  308  can either accept or reject the file. If User B  308  accepts, then a secondary PDP connection is established to send the media through a dedicated Quality of Service or QoS  320 . User A&#39;s UE  302  sends a message to User B&#39;s UE  307  opening the secondary PDP connection for file transfer. User B&#39;s UE  307  negotiates with User A&#39;s UE  302  to find an acceptable speed of transfer and packet size. This is normally the fastest speed the devices can handle in their current location subject to provider limitations, such as the data plan User B  308  pays for. After this negotiation  321 ,  322  is complete the file is sent through and is received on User B&#39;s UE  307 . Once the transfer is completed, the secondary PDP connection is dropped. These steps are repeated, starting with the file selection, for each file User A  301  wishes to send. User B  308  may select and send any file as well using the same steps as User A  301 . 
     While transferring files, a user may need to send a sensitive file. If this is the case the user has the option of sending the file over a secure connection. User A  301  would simply select another option from his device to secure the connection for this or any number of files. As the file is transferred it will be encrypted on User A&#39;s UE  302  and decrypted on User B&#39;s UE  307 . Their UE&#39;s  302 ,  307  can be equipped with any of the many forms of encryption that exist. 
     Once all the file transfers have completed, the session can be released, as shown in  FIG. 4 . User A  401  selects to release the session from a menu on the device  411 . A message  412  is sent from User A&#39;s UE  402  to User B&#39;s UE  407  either asking for a release in the session, or forcing a release in the session. If User B  408  accepts the release, a message  414  is sent back to User A&#39;s UE  402  to close the connection. If the release is accepted or forced, User A&#39;s UE  402  closes the connection  415  with the server  404  immediately. User B  408  can request or force a session release as well using the same steps as User A  401 . 
     This technique works for many cellular networks, and has many applications. Once such embodiment of this invention is a cellular telephone on a GSM/GPRS network connecting to another cellular telephone on a GSM/GPRS network. GSM stands for Global Standard for Mobile Communication, and is the technology behind many mobile carriers today. GPRS stands for General Packet Radio Service, and is the standard for sending data in packets across the GSM network, allowing multiple users to send data using the same channel. 
     The cellular telephones connect in a voice call over the GSM network. Once established, the first user pushes the keys on his cellular telephone to send a request to the other user to initiate the file sharing session. This request is sent through the tower to a GPRS server known as a Serving GPRS Support Node or SGSN. From the SGSN the request is relayed through a GPRS gateway known as a Gateway GPRS Support Node or GGSN. Once the request is received by the other user&#39;s cellular telephone, she can opt to accept it or reject it. If accepted, the cellular telephones attempt to connect to each other using the GPRS Tunneling Protocol or GTP, the defining IP protocol for the GPRS system. GTP is used for the primary PDP connection, which is the basic constant connection for sending requests and the secondary PDP connection, which opens once a file starts transferring. 
     Another embodiment of the present invention is a cellular telephone on a GSM/GPRS network connecting to a personal computer using a VoIP connection. The first user&#39;s cellular telephone is connected over the GSM network which is translated through a gateway to the second user&#39;s Internet Service Provider, which then relays the signal to the IP address of the second user&#39;s personal computer. The first user or the second user can initiate the file transfer session by simply pressing a key or pattern of keys. The first user&#39;s cellular telephone has already registered with IMS and has been given an IP address. The cellular telephone and personal computer can use each other&#39;s IP addresses to find each other over the internet and establish a primary direct connection. Once established, the users are free to send multimedia files to each other using a secondary connection while still talking. 
     The foregoing disclosure of the exemplary embodiments of the present 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 forms disclosed. Many variations and modifications of the embodiments described herein will be apparent to one of ordinary skill in the art in light of the above disclosure. The scope of the invention is to be defined only by the claims appended hereto, and by their equivalents. 
     Further, in describing representative embodiments of the present invention, the specification may have presented the method and/or process of the present invention as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. As one of ordinary skill in the art would appreciate, other sequences of steps may be possible. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. In addition, the claims directed to the method and/or process of the present invention should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the present invention.

Technology Category: h