Abstract:
A system allows users of wireless mobile terminals to set reminders, alerts, or other actions to be triggered based on location or dynamics. Such location information may include, but is not limited to, a specific location description such as latitude, longitude and a radius describing a generally circular region in which the terminal is located. The system monitors the location information until the programmed conditions are satisfied. Once the location condition is satisfied the system of the present invention triggers the programmed reminder.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application claims benefit of U.S. Provisional application No. 60/252,995, filed Nov. 22, 2000, the content of which is herein incorporated by reference in its entirety. 

   TECHNICAL FIELD 
   This invention relates to wireless communication systems, and more particularly to providing a system that allows wireless communication system mobile terminal users to set reminders or actions in general to occur or be triggered based on a wireless terminal&#39;s location or location dynamics. 
   BACKGROUND 
   Cellular telephones may operate under a variety of standards including the code division multiple access (CDMA) cellular telephone communication system as described in TIA/EIA, IS-95, Mobile station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, published July 1993. CDMA is a technique for spread-spectrum multiple-access digital communications that creates channels through the use of unique code sequences. In CDMA systems, signals can be and are received in the presence of high levels of interference. The practical limit of signal reception depends on the channel conditions, but CDMA reception in the system described in the aforementioned IS-95 Standard can take place in the presence of interference that is 18 dB larger than the signal for a static channel. Typically, the system operates with a lower level of interference and dynamic channel conditions. 
   Wireless communication systems are beginning to incorporate network-based and network-assisted location determination systems. Some wireless handsets have network assisted GPS capability. Some CDMA wireless handsets make use of the wireless communication signals themselves to perform location-related measurements such as in Enhanced Forward Link Trilateration (EFLT) or Advanced Forward Link Trilateration (AFLT) which use the difference in phase delays of wireless signals as input to location calculations. Other wireless communication systems, such as some telematics products incorporate stand-alone capabilities such as GPS. Wireless terminals without location capabilities may also have access to location related information. For example, the base station that a mobile station communicates with may have a unique identifier that identifies that particular base station to the mobile or signal conditions may be recognized from past observations. These types of information inherently identify the mobile general location as being the same as at some prior time. 
   Location information can be used to enable location-based services. Similarly, location-based services can be network or terminal based or distributed between wireless communication system entities. Distributed or network based services generally require active communication and use of wireless resources such as communication channels. For example, the TIA/EIA location protocol standard IS-801 enables network-assisted GPS via messaging over the CDMA wireless link between infrastructure and terminals. Such resources may be expensive, limited and have quality of service impacts on usage such as moderate or high latency. The present invention focuses on both overcoming the necessity for using wireless communication connections to supply position location, such as network assisted, network based or standalone position location technologies, as well as providing a practical location-based service to terminal users. 
   SUMMARY 
   The present invention provides a system that allows users of wireless mobile terminals to set reminders, alerts, or other actions to be triggered based on location or dynamics. Consider for example, that a user of a wireless handset realizes that he or she wants to pick up some groceries on the way home as he or she passes a grocery store on the way to work. Using the present invention, the user can command the terminal to set a reminder in the form of, for example, a voice memo “buy groceries”. The user may then select that this reminder be played back upon re-entering the current general location. At this point, the invention stores information relating to the current location and begins monitoring. Such location information may include, but is not limited to, a specific location description such as latitude, longitude and a radius describing a generally circular region in which the terminal is located. Alternatively, such location information may include location-related information such as base station or sector identification or signal condition profiles. The system of the present invention monitors the location information until the programmed conditions are satisfied. In the example considered above, this would translate to detecting that the terminal left the area where the reminder was programmed and then re-entered that area. Once the location condition is satisfied the system of the present invention triggers the programmed reminder which, in the example considered, involves playing back a voice memo recording for the user. 
   An example of a stored location reminder consists of a recorded voice memo saying “pick up schematics from factory” associated with location information describing the general location of the factory and orientation information specifying that the reminder should only be triggered upon entering the factory area. 
   These and other features and advantages of the invention will become more apparent upon reading the following detailed description and upon reference to the accompanying drawings. 

   
     DESCRIPTION OF DRAWINGS 
       FIG. 1A  illustrates components of a wireless communication system appropriate for use with an embodiment of the invention. 
       FIG. 1B  is a block diagram showing features of a mobile station according to one embodiment of the invention. 
       FIG. 2  is a flow chart illustrating location reminder programming, monitoring and triggering procedures according to one embodiment of the present invention. 
       FIG. 3  is a diagram of a roaming mobile station for use in a wireless communication system illustrating monitoring and triggering of a location reminder according to one embodiment of the present invention. 
       FIG. 4  is a user interface design diagram showing an embodiment of user programming of location reminders. 
   

   DETAILED DESCRIPTION 
     FIG. 1A  illustrates components of an exemplary wireless communication system. A mobile switching center  102  communicates with base stations  104   a – 104   k  (only one connection shown). The base stations  104   a – 104   k  (generally  104 ) broadcasts data to and receives data from mobile terminals  106  within cells  108   a – 108   k  (generally  108 ). The cell  108  is a geographic region, roughly hexagonal, having a radius of up to 35 kilometers or possibly more. 
   A mobile terminal  106  is capable of receiving data from and transmitting data to a base station  104 . In one embodiment, the mobile terminal  106  receives and transmits data according to the Code Division Multiple Access (CDMA) standard. CDMA is a communication standard permitting mobile users of wireless communication devices to exchange data over a telephone system wherein radio signals carry data to and from the wireless devices. 
   Under the CDMA standard, additional cells  108   a ,  108   c ,  108   d , and  108   e  adjacent to the cell  108   b  permit mobile terminals  106  to cross cell boundaries without interrupting communications. This is so because base stations  104   a ,  104   c ,  104   d , and  104   e  in adjacent cells assume the task of transmitting and receiving data for the mobile terminals  106 . The mobile switching center  102  coordinates all communication to and from mobile terminals  106  in a multi-cell region. Thus, the mobile switching center  102  may communicate with many base stations  104 . 
   Mobile terminals  106  may move about freely within the cell  108  while communicating either voice or data. Mobile terminals  106  not in active communication with other telephone system users may, nevertheless, scan base station  104  transmissions in the cell  108  to detect any telephone calls or paging messages directed to the mobile terminal  106 . 
   One example of such a mobile terminal  106  is a cellular telephone used by a pedestrian who, expecting a telephone call, powers on the cellular telephone while walking in the cell  108 . The cellular telephone scans certain frequencies (frequencies known to be used by CDMA) to synchronize communication with the base station  104 . The cellular telephone then registers with the mobile switching center  102  to make itself known as an active user within the CDMA network. 
     FIG. 1B  shows a block diagram of the mobile terminal  106 , including a processor  152  and memory  154 . The processor  152  may be driven by a program stored in the memory  154 . A portion of memory  156  may be used to store various parameters. 
     FIG. 2  is a flow chart illustrating location reminder programming, monitoring and triggering procedures according to one embodiment of the present invention. The procedure is executed on a mobile terminal with or without position location technology. The mobile terminal has some type of user-interface that is capable of allowing selecting or programming reminders alerts, or actions. 
   The mobile terminal also includes memory for storing location related information (“remembered” locations) and trigger or action information. The terminal also includes a position-monitoring function that compares one or more “remembered” locations with current location information. 
   Once the user selects to program a reminder  205 , the terminal may request the user to describe the reminder according to one or more parameters  210 . Optionally the terminal may allow the user to quickly select a default set of parameters. Examples of parameters include specifying a text reminder message to be displayed or selecting a sound to be played. 
   The user may be prompted to use a stored location or the current location. Alternatively, as shown in  FIG. 2 , by default the current location information is stored  215 . A mobile terminal can use location information such as base station ID, neighbor list, CDMA pilot PN offset, multi-path signal conditions or other signal conditions, GPS, FLT (AFLT or EFLT or other), or any other location identifying information. Note that it is not necessary for a location to be physically or geographically described by the information. It is only necessary that information allow the terminal to recognize whether or not it has left or returned to the same location. If the location information does describe a geographical area, then a set area may be defined in several ways: a point with a radius, network parameters, a geographic geometric shape, etc. It is also not necessary that the mobile knows the exact location or that the mobile tells the user what the location is as long as it can store and recognize it. The location area characteristics may be settable by the user or be adapted according to the precision, accuracy or availability of location information. 
   The terminal also stores the location reminder trigger and action information and a reference to the current location  220 . The terminal then monitors  225  the current location until it is outside of the “set” location area. For example, the terminal monitors the current location information and detects when the terminal has handed-off to another base-station or has exceeded a pre-set distance from the stored location. The mobile may detect that it is has transitioned out of the area described by the stored location information or that the current location matches the stored location information  230  but the direction of travel may also be checked  235 . For example, in the case where the mobile terminal is transitioning to an area outside the location described by the stored information, i.e. exiting the location, it may not trigger the stored action but rather return to continue monitoring  225 . The mobile terminal may then continue monitoring until the current location again matches or is similar to the stored location. 
   The mobile may monitor the current location periodically, whenever a significant change occurs, whenever a certain pre-programmed change occurs, whenever a call is made, a handoff occurs or any system conditions change. 
   The mobile terminal monitors the current location and triggers the stored action when it detects that it has reentered the vicinity of the stored-location, i.e. entering the location described by the stored location information. The action is triggered  240  when both the location matches  230  the stored location and the direction matches the stored trigger information  235 . Direction may be described, for example, as either entering a defined stored location or as exiting a defined stored location. A practical example of using this is a person who, while driving to work, wants to program a reminder for himself/herself to run an errand after work. The user would program the reminder action such as a voice memo to be played and select his/her office location as well as specify that the reminder should trigger only when exiting the office. 
   If the user programs the reminder to recur or repeat then the process returns to continue monitoring  225 . 
     FIG. 3  is a diagram of a roaming mobile station for use in a wireless communication system illustrating monitoring and triggering of a location reminder according to one embodiment of the present invention.  FIG. 3  shows a mobile terminal  300  that roams from inside Area A  350  to the border of Area A  350 , then to Area B  355  (outside Area A) and then returns into Area A  350  at some later time. A reminder can be programmed in Area A  350  when the mobile terminal is at location  300 . The invention monitors the current location information compared to the stored reminder location information. The mobile terminal may use techniques to prevent inappropriate triggering of the reminder action upon detecting the short transitions across the border between Area A and B around location  302 . The mobile may use hysteresis, delay, or other means to transition between leaving/entering a stored location area. The transition may be based on proximity, distance, time, time delay, signal conditions, environment, user actions, current network parameters (base station ID, pilot, system, network ID, etc) or other location or time based method. 
   The mobile terminal may therefore consider itself outside Area A only once it has reached location  304 . At this time the mobile terminal can check if any stored location information or triggers match the condition that occurred, i.e. that it exited Area A  350 . If a stored reminder matches this information then it is triggered and the associated action is executed. Since a reminder was stored with location  300 , when the mobile terminal returns to Area A  350  at location  308 , for example, the action associated with that stored reminder is executed. 
     FIG. 4  is a user interface design diagram showing one embodiment of user programming of location reminders. In the main reminder screen  400  the user may select to enter a new reminder or store information about a new location (the current location for example). If the user selects to set a reminder then the mobile terminal screen  405  is displayed. At this point the user may select from one or more options of actions to be executed when the reminder is triggered. Examples of options include but are not limited to setting or selecting a text message, setting, recording or selecting a voice memo or voice message recording, setting or selecting a ringer, or selecting a number to be dialed or called. The user may also select to describe the context information that describes the trigger of the reminder. This may include, for example, selecting a time and date, choosing location information or orientation/direction or trigger sensitivity. The user may also select to have the reminder repeating or recurring. 
   If the user selects to choose a location then screen  410  is displayed. The user may then select a location that has already been stored or the current location. Having selected a stored location, the user may then select the specific stored location information  415 . The mobile terminal may allow the user to store locations without alerts that can be used later. For example, a user may store a location “work” when he/she is at work so that this tag can be easily associated with a reminder at a later time, perhaps repeatedly or on different occasions and for different purposes. 
   Alternatively the user may select the current location and provide a text name to be associated with it  420 . Optionally, the user may then be able to select the orientation of the location trigger. For example, the user may select that the reminder be triggered only when exiting the region, entering the region or in both cases  425 . Alternatively the user may select from a sequence of events such as 2 nd  time entering the region. The user may also select to be reminded only upon leaving an area or entering an area independently or exclusively. For example, a user may set an alert to remind him/her to go to an appointment after leaving a meeting. 
     FIG. 4  shows some embodiments of the invention where the reminder action takes the form of display of a text message and either a voice memo play-back  450 , call to a number  445 , or playing a ringer  455 . In the case of a call, the terminal may allow the user to select the number to be called or a phone book entry, set the reminder to page a number with a numeric message (with specific or default text), set the reminder to send a mobile-originated short message sequence (SMS) message to a number upon triggering, or set the reminder to go to a specific URL page upon triggering. Examples of using the latter option include downloading a stock quote list, getting meeting notes, or downloading an advertisement. 
   The user is able to enter the text message in screen  435  if desired according to a selection made in screen  430  or use a default message. The user is then able to select whether the reminder is repeated or not in screen  440 . The user actions may be repeatable so that a user is reminded every time he/she enters or leaves a stored location. The accuracy or precision of locations may be improved with time through updates. Location precision and accuracy can be improved through multiple measurements or through refinement of the measurements. Determining improved location fixes using multiple measurements such as by averaging multiple measurements or fixes is well known in the art. Similarly, refining measurements by narrowing down search windows for satellite signals or eliminating possibilities in ambiguity searches are also well known in the art. 
   Location dependent actions may also be dependent on a time schedule. For example the user may program a reminder to remind him or her when he or she leaves work every weekday. Actions may also be associated with other conditions such as the active number assignment module (NAM). If a device or user has multiple phone numbers, the user may want to associate certain reminders or actions only when particular phone numbers are active or in use. 
   There are numerous variations, modifications and different procedural orderings of the present invention will become readily apparent to those skilled in the art. Accordingly, the invention may be embodied in other specific forms without departing from its spirit or essential characteristics.