CROSS REFERENCE TO RELATED APPLICATIONS 
     G. L. Griffith, “A Wireless Telephone As A Transaction Device”; and 
     G. L. Griffith, “Interaction Of A Wireless Telephone With A Transaction Unit”. 
     These applications are being filed concurrently with this application and are assigned to the same assignee. 
     TECHNICAL FIELD 
     This invention relates to secure transaction and more particularly, to an arrangement for utilizing a central computer to verify a wireless telephone to function as a transaction device. 
     BACKGROUND OF THE INVENTION 
     Within the prior art, various transaction devices have been utilized to allow individuals to perform transactions. These transactions may be to purchase merchandise or services or may be to gain access to a secure area. Among the commonly used transaction devices is a credit card with a magnetic strip that identifies the credit card account of the individual. The standard credit card has no capability of receiving information from the transaction unit utilized to read the credit card. In addition, the validity of the credit card can only be indirectly verified. However, various types of smart cards do have the ability to store transactional information and to later reproduce this transaction information. For example, it is possible to have a smart card that is utilized as a standard credit card but receives information from the transactional unit defining what was purchased. In addition, the smart card can organize this information for later transmission to a personal computer via a physical link. 
     Similarly, other types of transactions involve such things as entering secure areas. Because of the need to preserve proprietary information, or restrict access to dangerous physical locations, many building facilities have secure areas which can only be accessed by designated people. Access to these secure areas is controlled by identification of personal features of an individual, keyed or unkeyed locks, and identification badges such as cards with magnetic strips. The cards with magnetic strips are similar to credit cards or smart cards. 
     The problems that exists with the prior art transaction devices fall into four major categories. First, these transaction devices are not capable of directly and independently establishing their validity with an independent center. Second, these devices require that the transaction unit have a special interface for reading information from the device. The special reading facility may take the form of physical contact such as in a credit card application or may allow limited wireless reading of the transaction device by the transaction unit using, for example, electromagnetic transmission. However, even in the situation where the transaction device communicates information via electromagnetic transmission, the transaction unit must be specifically equipped for the particular type of electromagnetic transmission. The third problem is the proliferation of credit cards, checkbooks, debit cards, and security cards that the average individual must carry. Fourth, is the amount of time required to complete the transaction. For example, when a credit card is used to purchase groceries at a supermarket. First, the groceries must be rung up; and then, the credit card entered and verified before the transaction can be completed. 
     SUMMARY OF THE INVENTION 
     The foregoing problems are solved and a technical advance is achieved by the utilization of a wireless telephone to function as a transaction device in conjunction with central computer that establishes the validity of the wireless telephone to make transactions. In a first embodiment, a wireless telephone places a call to a central computer which provides a central verification of the wireless terminal&#39;s authorization to make transactions. The central computer requests from the wireless telephone personal information of the user that can be used to verify a transaction. The personal identification information may be a simple personal identification number (PIN) or advantageously voice identification. Once the wireless telephone is verified, the wireless telephone transmits to the central computer account information. The central computer then contacts a site computer that is controlling a transaction unit with which the wireless telephone wishes to complete a transaction. The site computer then transmits to the transaction unit, and the central computer a transaction number. The central computer relays this transaction number to the wireless terminal which displays it to the user. The site computer relays the transaction number to the transaction unit and the transaction unit also displays the transaction number. The user of the wireless terminal then confirms the transaction when the correct transaction number is displayed on the transaction unit by transmitting an acceptance message to the central computer which relays this message to the site computer. After the transaction is complete, the site computer transmits transaction data to the central computer. Advantageously, the central computer determines whether the transaction data is to be transmitted to the wireless telephone or communicated to a personal computer (PC) owned by the user of the wireless telephone. Advantageously, within a large facility such a supermarket, only the site computer needs to have a communication link over which calls can be received from the central computer. One skilled in the art could readily envision that there could be more that one central computer serving various accounts. 
     In a second embodiment, the transaction number is not visually displayed but rather is transmitted over a second transmission medium to the wireless telephone confirming that the correct transaction is taking place. 
     Advantageously, by utilizing the transaction number, the wireless telephone can transmit the account information to the site computer well in advance of the actual financial transaction taking place. For example, within a supermarket, the user could request that the wireless telephone transmit the account information while the user is standing in line for the cash register. 
     Advantageously, where the wireless telephone receives the transaction data, the wireless telephone can place a call to the personal computer of the user and transfer the transaction information to the personal computer. This alleviates the need of the user physically attaching the wireless telephone to the personal computer. It is assumed that the personal computer performs the necessary financial and database functions on transaction information as required by the user. 
     These and other features and advantages of the invention will become apparent from the following description of illustrative embodiments of the invention considered together with the drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a block diagram of a system for performing the first embodiment; 
     FIG. 2 is a block diagram of a wireless telephone for utilization in the first embodiment; 
     FIG. 3 illustrates in block diagram form, a system including the second embodiment; 
     FIG. 4 illustrates, in block diagram form, a wireless telephone for utilization in the second embodiment; 
     FIGS. 5 and 6, illustrate in flowchart form, steps performed by a wireless telephone in implementing the first embodiment of the invention; 
     FIGS. 7 and 8 illustrate, in flowchart form, steps performed by a central computer in implementing the first embodiment of the invention; 
     FIGS. 9 and 10 illustrate, in flowchart form, steps performed by a site computer in implementing the first embodiment of the invention; 
     FIG. 11 illustrates, in flowchart form, steps performed by a transaction unit in implementing the first embodiment of the invention; 
     FIGS. 12 and 13 illustrate, in flowchart form, steps performed by a wireless telephone in implementing a second embodiment of the invention; 
     FIGS. 14 and 15 illustrate, in flowchart form, steps performed by a central computer in implementing the second embodiment of the invention; 
     FIGS. 16 and 17 illustrate, in flowchart form, steps performed by a site computer in implementing the second embodiment of the invention; and 
     FIG. 18 illustrates, in flowchart form, steps performed by a transaction unit in implementing the second embodiment of the invention. 
    
    
     DETAILED DESCRIPTION 
     FIG. 1 illustrates a system for implementing the first embodiment of the invention. In the first embodiment, site  108  has site computer  104  that controls transaction units  106 - 109 . Attached to each transaction unit is a visual display such as display  107  which is connected to transaction unit  106 . If site  108  is a supermarket, the transaction units are cash registers, and site computer  104  is the store computer that controls the cash registers. Wireless telephone  103  interconnects via a wireless telecommunication path to wireless switching system  102  that is connected via links  114  to public telephone network  101 . Central computer  100  is connected via links  112  to public telephone network  101 . Central computer  100  maintains a central database that is utilized to verify that wireless telephones, such as wireless telephone  103 , are authorized to make transactions. The user of wireless telephone  103  has personal computer (PC)  111  at the residence of the user. PC  111  is connected via a modem and link  116  to public telephone network  101 . In addition, site computer  104  is interconnected via modems and links  113  to public telephone network  101 . 
     To understand the operation of the fist embodiment, consider the following example. Site  108  is a supermarket; and the user of wireless telephone  103  has selected merchandise and is waiting in line to pay for this merchandise at transaction unit (cash register)  106 . The user initiates a call to central computer  100  via wireless switching system  102 , links  114 , public telephone network  101 , and links  112 . Advantageously, this call may be a data call. When central computer  100  receives the call from wireless telephone  103  specifying that a transaction is taking place at site  108  using transaction unit  106 , central computer  100  verifies that the site is valid. Central computer  100  then receives the PIN from wireless telephone  103  and verifies that the PIN is valid. If the PIN is not valid, central computer  100  performs error recovery and drops the call with wireless telephone  103 . If the PIN is valid, wireless telephone  103  then transmits the account information, and central computer  100  verifies this account information. After verifying the account information and the PIN, central computer  100  sets up a call to site computer  104  and transmits the transaction unit identification and account information to site computer  104 . The previous steps can be performed while the user of wireless telephone  103  is standing in line since no interaction is required with transaction unit  106 . 
     In response to the information from central computer  100 , site computer  104  transmits a transaction number to both transaction unit  106  and central computer  100 . The transaction number is used to verify the transaction. When wireless telephone  103  receives the transaction number, the wireless telephone displays the transaction number to the user. Transaction unit  106  also displays the transaction number on display  107  that is visible to the user. When the transaction is complete, if the displayed transaction number is identical to the transaction number received by wireless telephone  103 , the user accepts the transaction. Wireless telephone  103  then transmits an acceptance message to central computer  100  which in turn relays this acceptance to site computer  104 . 
     In response to the acceptance message, site computer  104  transmits to central computer  100  transaction data defining the transaction. Central computer  100  can either retransmit this data to wireless telephone  103  for internal storage within the wireless telephone or transmit this data to PC  111 . Advantageously, the transaction data consists of an itemized list of items by price. Wireless telephone  103  is responsive to the received transaction data to either store it internally or to transfer it to PC  111 . Advantageously, this transfer can occur at a later point at time. U.S. Pat. No. 5,559,313 discloses how such transaction data could be utilized and processed by PC  111 . 
     Wireless telephone  103  is advantageously illustrated in greater detail in FIG.  2 . Wireless set  103  implements a wireless protocol that allows wireless telephone  103  to establish a wireless signal link with wireless switching system  102 . One air interface that can be used is the Japanese PHS protocol as set forth in “User-Network Interface and Inter-Network Interface Standards for PHS”, the Telecommunication Technology Committee, 1995, and “Personal Handy Phone System RCR Standard”, Version 1, RCR STD-28, Dec. 20, 1993. The message set of the PHS protocol is similar to the ISDN message set. Overall control of the wireless telephone is provided by control unit  201 . Units  202 ,  203 ,  206 ,  207 ,  208 , and  209  provide the RF communication capabilities for the wireless telephone. Elements  204 ,  210 , and  211 - 214  provide the audio information received and transmitted to the user; whereas, elements  216 - 218  and  205  provide the basic user interface. In response to receiving a transaction number via units  206 ,  208 , and  203 , control unit  201  displays the transaction number on display  216 . 
     FIG. 3 illustrates a system for performing the second embodiment of the invention. The operation of the second embodiment is similar to that of the first embodiment with the exception that the transaction number is transmitted to wireless telephone  303  by the transaction unit via a second transmission medium distinct from the transmission medium of wireless switching system  302 . The transmission of the transaction number via the second medium frees the user from having to do visual comparison of the transaction number. 
     Wireless telephone  303  is advantageously illustrated in greater detail in FIG.  4 . Wireless set  303  implements a wireless protocol that allows wireless telephone  303  to establish a wireless signal link with wireless switching system  302 . One air interface that can be used is the Japanese PHS protocol as set forth in “User-Network Interface and Inter-Network Interface Standards for PHS”, the Telecommunication Technology Committee, 1995, and “Personal Handy Phone System RCR Standard”, Version 1, RCR STD-28, Dec. 20, 1993. The message set of the PHS protocol is similar to the ISDN message set. Overall control of the wireless telephone is provided by control unit  401 . Units  402 ,  403 ,  406 ,  407 ,  408 , and  409  provide the RF communication capabilities for the wireless telephone. Elements  404 ,  410 , and  411 - 414  provide the audio information received and transmitted to the user; whereas, elements  416 - 418  and  405  provide the basic user interface. 
     FIGS. 5-11 illustrate, in flow chart form, steps performed in implementing the first embodiment of the invention. In particular, FIGS. 5 and 6 illustrate steps performed by wireless telephone  103  of FIGS. 1 and 2. After the operations are started, decision block  501  determines if the user is requesting an account transaction. If the answer is no, block  515  performs normal processing before returning control back to decision block  501 . 
     If the answer is decision block  501  is yes, then  503  determines the account against which the transaction will be charged. Block  504  places a call to central computer  100  identifying the site and transaction unit. Block  505  then transmits the PIN to central computer  100 . Decision block  506  determines if the central computer accepted the PIN. If the answer is no, block  514  performs error recovery before transferring control back to decision block  501 . If the answer is yes in decision block  506 , block  507  transmits the account information to central computer  100  before transferring control to decision block  600  of FIG.  6 . 
     Decision block  600  waits for a predefined amount of time for the transaction number to be received from the site computer via central computer  100 . If the transaction number is not received within the predefined amount of time, control is transferred to block  609  which performs error recovery before transferring control back to decision block  501  of FIG.  5 . If the answer in decision block  600  is yes, block  601  displays the transaction number on the wireless telephone. Decision block  602  waits until the user accepts the transaction. If the user does not accept the transaction, block  607  performs error recovery before transferring control back to decision block  501  of FIG.  5 . If the user accepts the transaction, block  603  transmits an acceptance message to central computer  100 . Decision block  604  waits for the receipt of transaction data from central computer  100 . If no transaction data is received, block  608  performs error recovery. However, if it has been predefined that central computer  100  will directly transmit the transaction data to PC  111 , the error recovery is to do nothing. If the answer is yes in decision block  604 , block  606  updates the account database with the received transaction data. The operation of block  606  may involve the later transmission of the received transaction data to PC  111 . After execution of either blocks  606  or  608 , control is transferred back to decision block  501  of FIG.  5 . 
     FIGS. 7 and 8 illustrate the steps performed by central computer  100  in implementing the first embodiment. Once operation is started, decision block  701  determines if a call is being received from a wireless telephone. If the answer is no, block  705  performs normal processing before returning control back to decision block  701 . If the answer is yes in decision block  701 , decision block  702  determines if the message from the wireless telephone specifies a valid site. If the answer is no, block  709  performs error recovery before transferring control back to decision block  701 . If the answer in decision block  702  is yes, block  703  receives the PIN from the wireless telephone, and decision block  704  determines if the PIN is valid. If the answer in decision block  704  is no, block  717  performs error recovery before transferring control back to decision block  701 . If the answer in decision block  704  is yes, block  713  receives the account information from the wireless telephone. Block  714  requests from the appropriate database verification of the account information. Decision block  706  determines if the account information is valid. If the answer is no, block  707  performs error recovery before transferring control back to decision block  701 . If the answer in decision block  706  is yes, block  708  transmits the transaction unit identification and account information to site computer  104 . Decision block  712  then awaits for a predefined amount of time for the transaction number from the site computer  104 . If the transaction number is not received, control is transferred to block  716  which performs error recovery before transferring control back to decision block  701 . If the answer in decision block  712  is yes, control is transferred to block  801  of FIG.  8 . 
     Block  801  transmits the transaction number to the wireless telephone. Decision block  802  awaits for a complete message from central computer  100 . If a complete message is not received, block  811  performs error recovery before transferring control back to decision block  701  of FIG.  7 . If a complete message is received in decision block  802 , decision block  803  determines if an acceptance message is received from the wireless telephone within a predefined amount of time. If the acceptance message is not received, control is transferred to block  812  which performs error recovery before transferring control to decision block  701  of FIG.  7 . If the answer in decision block  803  is yes, block  804  transmits the acceptance message to site computer  104 . Block  805  then receives the transaction data from site computer  104 . Decision block  806  determines if the transaction data is to be transmitted to the wireless telephone. If the answer is yes, block  807  transmits the transaction data to the wireless telephone before transferring control to block  813 . Block  813  terminates the calls with the site computer and the wireless telephone before transferring control back to decision block  701  of FIG.  7 . If the answer in decision block  806  is no, block  808  obtains the PC communication address from the wireless telephone; and block  809  transmits the transaction data to the PC before transferring control to block  813 . 
     FIGS. 9 and 10 illustrate the steps performed by site computer  104 . Once processing has been started, decision block  901  determines if a call is being received from central computer  100 . If the answer is no, block  905  performs normal processing before returning control back to decision block  901 . If the answer is yes, decision block  902  determines if the site and transaction unit identification information received from central computer  100  is valid. If the answer is no, block  909  performs error recovery before transferring control back to decision block  901 . If the answer in decision block  902  is yes, block  903  receives the account information from central computer  100 . Block  908  then determines and transmits a transaction number to the transaction unit and central computer  100  before transferring control to decision block  1001  of FIG.  10 . 
     Decision block  1001  determines if a complete message has been received from the transaction unit within a predefined amount of time. If the answer is no, control is transferred to block  1011  which performs error recovery before transferring control to block  1007 . Block  1007  terminates the call with central computer  100  before transferring control back to decision block  901  of FIG.  9 . If the answer in decision block  1001  is yes, decision block  1003  determines if an acceptance message has been received from central computer  100 . If the answer is no, block  1012  performs error recovery before transferring control to block  1007 . If the answer in decision  1003  is yes, block  1004  transmits a finish transaction message to the transaction unit. Block  1006  transmits the transaction data to central computer  100  before transferring control to block  1007 . 
     FIG. 11 illustrates the steps performed by a transaction unit in implementing the first embodiment. After execution is started, decision block  1101  determines if a message has been received from site computer  104 . If the answer is no, control is transferred to block  1103  which performs normal processing before transferring control back to decision block  1101 . If the answer in decision block  1101  is yes, decision block  1102  determines if the message contains a transaction number. Site computer  104  transmits the transaction number in all messages pertaining to the acceptance of a transaction by the wireless terminal. If the answer in decision block  1102  is no, control is transferred to block  1103 . If the answer is yes, block  1103  displays the transaction number on the attached display. Decision block  1104  determines when the transaction is complete and transfers control to block  1106  which transmits a complete message to site computer  104 . After execution of block  1106 , decision block  1107  waits for a finish transaction message from site computer  104 . If this message is not received, block  1109  performs error recovery before transferring control back to decision block  1101 . If the finish transaction message is received, block  1108  transmits a complete message to site computer  1108 . 
     FIGS. 12-18 illustrate the steps performed in implementing the second embodiment of the invention. In particular, FIGS. 12 and 13 illustrate the steps performed by telephone  303  of FIGS. 3 and 4. After operation is started, decision block  1201  determines if the user of the wireless telephone is requesting an account transaction. If the answer is no, block  1215  performs normal processing before returning control back to decision block  1201 . If the answer in decision block  1201  is yes, block  1203  determines the account that the user wishes to use for this particular transaction. Then, block  1204  places a call to central computer  300  identifying the site and the transaction unit. The PIN is transmitted to central computer  300  by block  1205 . Decision block  1206  determines if the PIN is accepted by central computer  300 . If the answer is no, block  1214  performs error recovery before transferring control back to decision block  1201 . If the answer is yes in decision block  1206 , block  1207  transmits the account information to central computer  300  before transferring control to block  1301  of FIG.  13 . 
     Block  1301  receives the transaction number from the central computer, and decision block  1302  waits for a match of the transaction number from central computer  300  and the transaction number being transmitted by the transaction unit. If no match occurs after a predefined amount of time, control is transferred to block  1307  which performs error recovery before transferring control back to decision block  1201  of FIG.  12 . If the answer is yes in decision block  1302 , block  1303  transmits an acceptance message to central computer  300 . Decision block  1304  then waits for transaction data from central computer  300 . If no transaction data is received, error recovery is performed by block  1308  before transferring control to decision block  1201  of FIG.  12 . If the answer is yes in decision block  1304 , control is transferred to  1306  which updates the account database as was previously described in the description of the first embodiment.
Utilizing a wireless telephone to function as a transaction device in conjunction with central computer that establishes the validity of the wireless telephone to make transactions. In a first embodiment, a wireless telephone places a call to a central computer which provides a central verification of the wireless terminal's authorization to make transactions. The central computer requests from the wireless telephone personal information of the user that can be used to verify a transaction. Once the wireless telephone is verified, the wireless telephone transmits to the central computer account information. The central computer then contacts a site computer that is controlling a transaction unit with which the wireless telephone wishes to complete a transaction. The site computer then transmits to the transaction unit and the central computer a transaction number. The central computer relays this transaction number to the wireless terminal which displays it to the user. The site computer relays the transaction number to the transaction unit, and the transaction unit also displays the transaction number. The user of the wireless terminal then confirms the transaction when the correct transaction number is displayed. In a second embodiment, the transaction number is not visually displayed but rather is transmitted over a second transmission medium to the wireless telephone confirming that the correct transaction is taking place.