Abstract:
A method and system for generating one of a first and second audible tone in a telephony system including a telephony device responsive to a first signal to generate the first audible tone and responsive to a second signal to generate the second audible tone includes receiving an information signal from the telephony system and a user initiated signal from the telephony device indicating a desire to initiate a call from the telephony device. A processor processes the information signal and the user initiated signal to determine at least one of billing rate information, available services, and service control procedures associated with the desired call and generate one of the first and second signals. A dial tone generator generates one of the first and second audible tones in response to one of the first and respectively.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS  
       [0001]    This application claims the benefit and is a continuation of U.S. patent application Ser. No. 09/064,376 filed on Apr. 22, 1998, which is incorporated by reference in its entirety. 
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    This invention relates to methods and systems for generating information-bearing audible tones. The basic purpose of a dial tone is to inform the user of the availability of service. In a wireline system, the dial tone indicates that facilities are available to receive digits.  
           [0003]    However, there is no such dial tone available to users of a wireless system that provides an indication to the user that the radio signal strength available is sufficient to make a call attempt. Furthermore, the dial tone does not provide any other kind of information, such as whether the communications service is being offered by the user&#39;s “home” service provider or by an “interconnected” or “roaming” service provider that may provide different services, employ alternative control procedures, or charge higher rates. Thus, there exists a need for generating dial tones that provide additional information to the user.  
         BRIEF SUMMARY OF THE INVENTION  
         [0004]    It is a general object of the present invention to provide a method and system for generating information-bearing audible dial tones. It is another object of the present invention to provide an information-bearing dial tone that is easily recognizable as a dial tone. It is yet another object of the present invention to provide an information-bearing dial tone that can be detected by automated equipment: such as modems. Still further, it is an object of the present invention to provide an information-bearing dial tone that satisfies the telecommunications industry standard for tones.  
           [0005]    In carrying out the above objects and other objects, features, and advantages of the present invention, a method is provided for generating one of a first and second audible tone in a telephony system including a telephony device responsive to a first signal to generate the first audible tone and responsive to a second signal to generate the second audible tone. The method includes receiving an information signal from the telephony system and receiving a user initiated signal from the telephony device indicating a desire to initiate a call from the telephony device. The method also includes processing the information signal and the user initiated signal to determine at lease one of billing rate information, available services, and service control procedures associated with the desired call and generate one of the first and second signals. Still further, the method includes generating one of the first and second audible tones in response to one of the first and second signals, respectively.  
           [0006]    In further carrying out the above objects and other objects, features, and advantages of the present invention, a system is also provided for carrying out the steps of the above described method. The system includes means for receiving an information signal from the telephony system and means for receiving a user initiated signal from the telephony device indicating a desire to initiate a call from the telephony device. The system also includes a processor for processing the information signal and the user initiated signal to determine at least one of billing rate information, available services, and service control procedures associated with the desired call and generate one of the first and second signals. The system further includes a dial tone generator for generating one of the first and second audible tones in response to one of the first and second signals, respectively.  
           [0007]    The above objects and other objects, features and advantages of the present invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]    [0008]FIG. 1 is a schematic diagram of a wireless service environment illustrating the use of the present invention;  
         [0009]    [0009]FIG. 2 is a flow diagram illustrating the general sequence of steps associated with the wireless service application of the present invention;  
         [0010]    [0010]FIG. 3 is a block diagram of the hardware associated with a wireless telephone capable of generating the information-bearing audible tones of the present invention; and  
         [0011]    [0011]FIG. 4 is a block diagram of the hardware associated with a wireline telephone capable of generating the information-bearing audible tones of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0012]    Turning now to FIG. 1, there is shown a schematic diagram of a wireless service environment illustrating the use and operation of the present invention. A typical wireless service environment consists of various coverage areas A, B, C. Coverage areas A and B each include at least one Base Station (BS)  10  belonging to a single wireless service provider. Each of the BSs  10  provide acceptable service as determined by subscription, as well as signal type, strength and quality of transmissions between a Mobile Station (MS)  12  and a BS  10 .  
         [0013]    Coverage area C is an area for which neither provider&#39;s BSs  10  provides acceptable service as determined by the subscription, as well as signal type, strength and quality of transmissions between a MS  12  and a BS  10 . When MS  12   a  is located in coverage area C, a dial tone would not be produced upon an origination  10  attempt because no providers&#39; BSs  10  provide acceptable service as determined by subscription, as well as signal type, strength and quality of transmissions between MS  12   a  and any provider&#39;s BSs  10 .  
         [0014]    When the MS  12   b  is located within coverage area A, as shown in FIG. 1, one and only one provider&#39;s BSs  10  provide acceptable service. Thus, upon an origination attempt, MS  12   b  would produce a normal dial tone if and only if MS  12   b  is registered to an account of a subscriber of the provider offering service via one or more BSs  10  in area A and/or software in MS  12   b  defines the provider offering service as a “home” provider. The normal dial tone may consist of the standard dial tone frequencies, i.e., simultaneous and continuous 350 Hz and 440 Hz audible tones, or any other suitable dial tone. On the other hand, MS  12   b  would produce a “roaming” dial tone upon an origination attempt if MS  12   b , is registered to an account of a subscriber of a provider with a roaming agreement with the provider offering service via one or more BSs  10  in area A and/or software in MS  12   b  defines the provider offering service as an acceptable “roaming” provider. The roaming dial tone is generally an easily differentiable variation of the standard, or normal, dial tone. As an example, the normal dial tone may be the standard simultaneous and continuous 350 Hz and 440 Hz audible tones, as mentioned above, while the roaming dial tone may correspond to a continuous 350 Hz tone and a cyclical 440 Hz tone. The 440 Hz tone may break for 50 milliseconds every two seconds, beginning at 450 milliseconds after onset of the dial tone. This short break is sufficiently long to be easily noticed by human users, while allowing automated dial tone detectors to function properly. Furthermore, this roaming dial tone may be detected by automated equipment, such as modems and facsimile machines.  
         [0015]    Similarly, when MS  12   c  is located in coverage area B, MS  12   c  would produce a normal dial tone upon an origination attempt if and only if MS  12   c  is registered to an account of a subscriber of the provider offering service via one or more BSs  10  in area B and/or software in MS  12   b  defines the provider offering service as a “home” provider. Likewise, MS  12   c  would produce a “roaming dial tone” upon an origination attempt if MS  12   c  is registered to an account of a subscriber of a provider with a roaming agreement with the provider offering service via one or more BSs  10  in area B and/or software in MS  12   b  defines the provider offering service as an acceptable “roaming” provider.  
         [0016]    At the intersection of coverage areas A and B, two or more providers&#39; BSs  10  provide acceptable service  30  as determined by subscription, as well as signal type, strength and quality of transmissions between MS  12   d , and two or more providers&#39; BSs  10 . In this case, upon an origination attempt, MS  12   d  would generally produce a normal dial tone if and only if MS  12   d  is registered to an account of a subscriber of the provider offering service via one or more BSs  10  in either area A or area B and/or software in MS  12   b  defines the provider offering service as a “home” provider. MS  12   d  would also obtain service from the subscriber&#39;s subscribed provider, i.e., the subscriber&#39;s “home” service provider. This is because MS  12   d  contains a list of acceptable providers and their preference ordering. The preference ordering would, in general, prefer BSs  10  of the subscribed provider, i.e., the “home” BSs  10 .  
         [0017]    If, however, MS  12   d  is not registered to an account of a subscriber of a provider offering service in either area A or B and/or software in MS  12   b  defines the provider offering service as an acceptable “roaming” provider, then MS  12   d  would produce a roaming dial tone upon an origination attempt. MS  12   d  would then obtain service from the preferred, but not “home”, provider according to a table look-up of acceptable providers as determined by subscription, as well as signal type, strength and quality of transmissions between MS  12   d  and two or more providers&#39; BSs  10 .  
         [0018]    Some exceptions to the above are possible under some circumstances. These exceptions include, but are not limited to, allowing user control actions to override MS  12  software-guided preferences, and. allowing automated or manual provider system control actions that override MS  12  software-guided preferences and/or user control actions, e.g., traffic load or system outage management actions. Under these exception conditions, a normal dial tone is produced when the resulting attempt to originate a call is through BSs  10  that are part of the subscriber&#39;s subscribed or “home” system. Otherwise, a roaming dial tone is produced. The result for the user is immediate knowledge of whether origination may be expected to take place on the home or roaming systems with all resulting consequences, e.g., airtime rates, minute quota impacts, feature availability, etc.  
         [0019]    Turning now to FIG. 2, there is shown a flow diagram illustrating the general sequence of steps associated with the method of the present invention when utilized in the wireless service environment. The method begins with the MS  12  powering ON and/or entering a coverage area having one or more BSs  10 , as shown at block  20 . The MS  12  receives interpretable signal(s) from one or more BSs  10  that identify the system(s) to which each BS  10  belongs, as shown at block.  22 . An interpretable signal is a signal of compatible technology as the MS  12 , having sufficient strength and recognizably coded.  
         [0020]    A processor  14  associated with the MS  12 , FIG. 3, then searches an internal memory storage  16  to determine which, if any, of the systems belong to an acceptable service provider, as shown at block  24 . An acceptable provider is identified as the system of a non-subscribed provider recognized as providing service of quality and on terms acceptable to the subscribed provider as programmed in the memory  16 . Among the acceptable providers, a search is performed to determine the preferred provider.  
         [0021]    Next, the MS  12  acquires the preferred system and continues to search for a more preferred system, as shown at block  26 . Then upon a user origination attempt, the a dial tone generator  18  generates the normal dial tone if the currently acquired system is its “home” system, as shown at block  28 . Otherwise, the dial tone generator  18  generates the roaming dial tone for receipt by the subscriber.  
         [0022]    The present invention can also be utilized in conjunction with a wireline service environment. In this case, a wireline telephone  40 , shown in FIG. 4, is continuously powered ON and physically connected to a wired termination of a facilities-based Local Exchange Carrier (LEC)  42 . The LEC  42  is a local exchange services provider that owns or otherwise controls the physical facilities that provide local access telephone services, e.g., local central office switch, loop facilities, terminations, etc. The wired station (WS)  40  is connected to a dial tone generator  44  of the LEC  42 , which is also in communication with a processor  46 . The dial tone generator  44  generates either the normal dial tone or the “roaming” dial tone for receipt by the subscriber based on an instruction, or signal, from the processor  46 .  
         [0023]    The processor  46  is in communication with a subscriber list, or table look-up memory,  48 . Memory  48  includes a list identifying whether the subscriber is a subscriber of the LEC  42  or of an Interconnected Local Exchange Carrier (ILEC). An ILEC is a local exchange services provider that leases or otherwise contracts for the use and operation of physical facilities owned or otherwise controlled by a LEC.  
         [0024]    Prior to dialing by the subscriber, the WS  40  goes offhook. At this time a determination is made as to whether the wired termination of the WS  40  is subscribed to by either the LEC or the ILEC according to the memory  48 . If the WS  40  wired termination is determined by the processor  46  to be subscribed to the LEC, the dial tone generator  44  generates the normal dial tone. On the other hand, if the wired termination is determined to be subscribed to an ILEC by the processor  46 , then dial tone generator  44  generates the roaming dial tone.  
         [0025]    Thus, in either environment, the subscriber can know whether service is being offered by their “home” service provider or by other “interconnected” or “roaming” service providers. The subscriber is then aware of any different available services, service control procedures or billing rates to be assessed the current call at the time of the call rather than at the time of receiving a communications bill.  
         [0026]    While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims. For example, the present invention is not limited to only two different dial tones. It should be appreciated by one skilled in the art that additional different dial tones may similarly be generated for receipt by the subscriber based on additional information. Such additional dial tones, however, is limited by the subscriber&#39;s ability to distinguish each of the dial tones from each other.