Patent Publication Number: US-2007124395-A1

Title: Geography-based filtering of broadcasts

Description:
RELATED APPLICATIONS  
      This application claims priority to U.S. Provisional Application Ser. No. 60/719,808 filed on Sep. 22, 2005, entitled “LOCATION BASED FILTERING OF WIRELESS BROADCAST” which is assigned to the assigner hereof and which is hereby expressly incorporated by reference in its entirety for all purposes.  
      This application is related to U.S. patent application Ser. No. not yet assigned (temporarily referenced by Attorney Docket No. 060010), filed on Sep. 21, 2006 entitled “LOCATION-BASED COMMUNICATION CONTROL SYSTEM,” which is assigned to the assigner hereof and hereby expressly incorporated by reference in its entirety for all purposes. 
    
    
     BACKGROUND  
      This disclosure relates in general to communication systems and, more specifically to location-aware communication systems that send a message to a number of terminals amongst other things.  
      Current wireless broadcast and multicast services can send information to all users (i.e., broadcast) or designated users (i.e., multicast) with limited regard to the location of the users. At best, the location of target users can be controlled down to a cell sector level today. This crude location accuracy can be adequate for many services of interest to users and broadcasters (e.g., provide information to spectators at a sporting event on the results of similar events being held elsewhere). However, the crude level of location control (i.e., cell sector resolution) will not always be able to discriminate effectively between those users who need to receive, or will be interested in, the particular information and those who need not, or will not.  
      Various types of broadcast and multicast services have been defined or are currently being defined for wireless networks. These include Multimedia Broadcast Multicast Service (MBMS) for Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS) and Universal Mobile Terrestrial Service (UMTS) and evolved UMTS networks, which are being defined by Third Generation Partnership Project (3GPP). Cell Broadcast Service (CBS) has already been defined by the European Telecommunications Standards Institute (ETSI) and is maintained by 3GPP. Also being defined now are Broadcast services (BCAST) by OMA, Broadcast/Multicast service (BCMCS) by 3GPP2, Digital Video Broadcasting (BVB-H), and MediaFLO™ and various other services. These services will enable different types of information (e.g. video clips, text messages, audio messages and multimedia messages) to be sent to both particular groups of wireless users and to all users in a particular geographic area (potentially defined down to a cell-sector level) and served by particular wireless networks. The services employ various types of coarse filter (e.g. identity of a multicast group, identities of particular cell-sectors, identities of larger geographic areas containing multiple cell-sectors) to select particular sets of target users.  
      In order to reach all interested or affected users with conventional technology, information is sent to both interested and affected users and uninterested and unaffected ones. This increases the general level of information load which will be a nuisance, possibly increase costs for both network providers and users and make it more difficult to alert users to the most important information, for example to emergency information.  
      There are emergency multicast services that call telephone numbers to deliver a set message. For example, alert phone calls could be made when a tornado is approaching. Each phone number in the group is part of the multicast. Phone numbers are chosen based upon addresses associated with the phone number.  
      Some weather and emergency notification systems use radio or television broadcasts to deliver information. This information is sent to everyone who receives a particular channel or signal. Often the notification broadcast indicates a location for which the weather or emergency is relevant for. The user can manually react or not to the notification.  
     SUMMARY  
      In one embodiment, the present disclosure provides a communication system for filtering multi-destination messages. The communication system includes a number of transmitters, an interface, a first filter, and a second filter. The number of transmitters are configured to send information wirelessly to a number of wireless terminals. The interface is configured to receive messages intended for at least some of the number of wireless terminals, where the number of wireless terminals include a wireless terminal. The first filter is configured to determine a subset of the number of transmitters that generally correspond to a predetermined geographic criteria, where the subset are configured to transmit a message. The second filter is configured to determine if the wireless terminal corresponds to the predetermined geographic criteria.  
      In another embodiment, the present disclosure provides a method for filtering multi-destination messages. In one step, messages intended for at least some of a number of wireless terminals are received, where the number of wireless terminals comprise a wireless terminal. A subset of a plurality of transmitters is determined, where the subset generally correspond to a predetermined geographic criteria. The message is wirelessly transmitted to a number of wireless terminals using the subset. It is determined if the wireless terminal corresponds to the predetermined geographic criteria.  
      In yet another embodiment, the present disclosure provides a communication system for filtering multi-destination messages. The communication system includes means for receiving messages, first means for determining, means for transmitting, and second means for determining. The means for receiving messages serves to receive messages intended for at least some of a plurality of wireless terminals, where the plurality of wireless terminals comprise a wireless terminal. The first means for determining serves to determine a subset of a plurality of transmitters, where the subset generally correspond to a predetermined geographic criteria. The means for transmitting serves to transmit the message wirelessly to a plurality of wireless terminals using the subset. The second means for determining serves to determine if the wireless terminal corresponds to the predetermined geographic criteria.  
      In still another embodiment, the present disclosure provides a communication device for filtering multi-destination messages, where the communication device includes a processor and a memory. The processor is configured to: receive messages intended for at least some of a plurality of wireless terminals, wherein the plurality of wireless terminals comprise a wireless terminal; determine a subset of a plurality of transmitters, wherein the subset generally correspond to a predetermined geographic criteria; determine if the wireless terminal corresponds to the predetermined geographic criteria; and transmit the message wirelessly to a plurality of wireless terminals using the subset. The memory is coupled with the processor.  
      Further areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating various embodiments, are intended for purposes of illustration only and are not intended to necessarily limit the scope of the disclosure. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The present disclosure is described in conjunction with the appended figures:  
       FIGS. 1A and 1B  depict block diagrams of embodiments of a communication system;  
       FIGS. 2A, 2B  and  2 C depict block diagrams of embodiments of a mobile terminal;  
       FIGS. 3A, 3B  and  3 C depict diagrams of embodiments of a geographic layout showing a number of mobile terminals;  
       FIGS. 4A, 4B  and  4 C illustrate flowcharts of embodiments of a process for filtering multi-destination messages; and  
       FIG. 5  illustrates a block diagram of an embodiment of a communication system. 
    
    
      In the appended figures, similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.  
     DETAILED DESCRIPTION  
      The ensuing description provides preferred exemplary embodiment(s) only, and is not intended to limit the scope, applicability or configuration of the disclosure. Rather, the ensuing description of the preferred exemplary embodiment(s) will provide those skilled in the art with an enabling description for implementing a preferred exemplary embodiment. It being understood that various changes may be made in the function and arrangement of elements without departing from the spirit and scope as set forth in the appended claims.  
      One embodiment provides a method to filter information sent by broadcast and multicast services using location criteria for potential target users such that the proportion of users who receive the information and need to receive the information is significantly increased without reducing the number of such users. The method and apparatus is applicable whenever location plays some role in determining the set of target users.  
      There is a distinction between information received by a mobile terminal and information received by the user of a mobile terminal. Generally, filtering increases the number of user&#39;s of mobile terminals who receive information that actually can use the received information. This may be accomplished, in part or in whole, by increasing the proportion of mobile terminals who can use the received information on behalf of users who can use the received information. The mobile terminal may play a lesser or no role in supporting further filtering where the granularity of targeting is precise. Reaching those that can use the received information can also be done by increasing the proportion of mobile terminals who receive information on behalf of users who can use the received information in which case the mobile terminal may play a greater role in supporting further filtering. Some examples of this embodiment are provided further on herein.  
      In one embodiment, a new type of filter based on location information and location related criteria is disclosed. A broadcast sender is allowed to define particular location criteria that a prospective target mobile terminal satisfies in order to be enabled to receive the broadcast information or to pass on the broadcast information to the user or in order to receive or pass on the information with a particular priority indication. The criteria can include in various embodiments, but are not limited to, the following:  
      (a) Current location of a target mobile terminal inside of or outside of certain designated geographic areas, as specified by different two dimensional geometric shapes such a circle, ellipse or polygon. Each shape could be defined by specifying the coordinates (e.g., latitude, longitude) of certain points plus its geometric attributes and dimensions. For example, a circular area could be specified by the coordinates of its center plus its radius. A polygon might be specified using the coordinates of each of its vertices.  
      (b) Current altitude of a target mobile terminal above or below the earth&#39;s surface or above or below local ground level. The altitude could be specified as a range within which or outside of which the target mobile terminal needs to be.  
      (c) Previous location of a target mobile terminal as defined in (a) and/or (b) at some specific previous time or during a range of previous times or at any time in the past.  
      (d) Future location as defined in (a) and/or (b) of a target mobile terminal at some specific future time or during a range of future times or at any time in the future. Future location might be based on an extrapolation of the mobile terminal&#39;s current movement or, in some instances, on the user of the mobile terminal&#39;s known intent or requirement to be in or near some location or outside of or away from some location at a future time. For example, the user may have entered a target address into a routing function of the mobile terminal.  
      (e) Location of the mobile terminal as in (a), (b), (c), and/or (d) above but expressed in a civic manner—for example using a particular postal address, range of postal addresses, name of a street or set of streets, name and/or address of a building, city/county/state limit or well known location (e.g. airport, shopping mall, sports stadium, theatre, hotel). In the case of altitude, floor or subbasement level could be used.  
      (f) Current speed of a target mobile terminal expressed as a range within which or outside of which the target mobile terminal is traveling to qualify for the criteria.  
      (g) Current bearing (direction of movement) of a target mobile terminal expressed as a range within which or outside of which the mobile terminal is traveling to qualify for the criteria.  
      (h) Past and/or future speed and/or past and/or future direction of movement of a target mobile terminal.  
      Any logical combination of the above criteria could be used to provide finer levels of filtering by combining two or more of the above criteria using logical “and”, logical “or” and logical “not” operations. For example, information on the blockage of a major highway in one direction but not the other might be associated with location criteria identifying moving mobile terminals in the immediate vicinity of the blockage (e.g., users who might be considering entering the highway), plus (logical “or”) mobile terminals whose current location, speed and bearing implied possible arrival at the blockage before it was likely to be cleared. In another example, a tornado alert might be sent to target mobile terminals in a certain tall building whose altitude above a certain floor level placed them in greater jeopardy such that they are notified. In yet another example, information regarding the finding of a lost item (e.g., watch, jewelry, money) in a shopping mall might be sent to target mobile terminals whose previous location at or near the time of discovery placed them in or near the shopping mall.  
      The above criteria could be combined with certain non-geographic criteria such as the nature of the broadcast message (e.g., personal, job related, public, or emergency), the time at which the information becomes significant (e.g., date at which a sales event will occur) and the category of sender (e.g., user&#39;s wireless network operator, friend/relative, employer, public safety). Any filtering operation may then combine all the available criteria and determine the usefulness (e.g., priority to the user), the mode in which the information will be presented (e.g., whether using audible, visual and/or tactile signals) and possibly the time at which the information will be presented (e.g. whether immediately, at some defined later time or only when the user later makes some request to become aware of new information).  
      The filtering operation itself could be performed by the network and/or by the user&#39;s wireless terminal and/or by the user in various embodiments. Manual filtering by the user may be regarded as a last resort, to be avoided if at all possible, due to the possibility of delay and error as well as disturbing the user in cases where the user ends up discarding the message. In the case of network filtering, the network (for example, a wireless network Mobile Switching Center (MSC), Serving GPRS Support Node (SGSN), Call Server Control Function (CSCF), Base Station Subsystem (BSS), Radio Network Controller (RNC)) may obtain information regarding the current location, altitude, speed and bearing of a prospective target wireless terminal by determining the position of the mobile terminal or by querying another entity (e.g., a Position Determination Entity (PDE) or Serving Mobile Location Center (SMLC) or the user equipment (UE) itself). Positioning methods that could be used include such existing capabilities as enhanced cell identification (ID), Uplink Time Difference of Arrival (U-TDOA), Enhanced Observed Time Difference (E-OTD), Observed Time Difference Of Arrival (OTDOA), Assisted-Global Positioning System (A-GPS), and/or GPS. Future positioning systems such as Galileo could also be used in some embodiments.  
      In addition, the communication network may retrieve historic location information obtained and stored previously or query some server for this information. The network may also attempt to extrapolate or otherwise predict the mobile terminal&#39;s future location or a range of possible future locations, based for example on the mobile terminal&#39;s current location, speed and bearing. Based on this location information and the location criteria associated with the broadcast, the network may determine whether the particular broadcast information should or should not be sent to the mobile terminal.  
      Alternatively, based on the location information and location criteria, the network may determine that the broadcast information should be sent to the mobile terminal but with some priority or other indication indicating the level of importance to assist the mobile terminal in deciding whether and when to access the information. The priority or similar indication might be determined by both the importance of the broadcast information itself and the degree to which the mobile terminal&#39;s location information matched the associated location criteria. The priority indication could then enable an appropriate means of alerting the mobile terminal user to the availability of the information. For example, for particularly urgent information that the user should access immediately, the mobile terminal, based on a high indicated priority, may alert the user immediately by means of audible, visual and/or tactile (e.g., vibrational) cues. The priority may instead indicate less urgent, though still possibly important information, that the user should access soon but not necessarily immediately. In this case, the mobile terminal might just provide a low level audible indication (e.g. several beeps) and/or visual cue (e.g., screen icon).  
      In another embodiment, the information may be broadcast or multicast to a set of mobile terminals based on coarse filtering criteria such as membership of a multicast group and/or service in particular cell-sectors of a wireless network. The information may be accompanied by the associated location criteria. The mobile terminal would obtain the current location information for the mobile terminal, for example by using such existing positioning methods as A-GPS, GPS, E-OTD, Advanced Forward Link Trilateration (A-FLT), OTDOA, cell-sector ID, enhanced cell ID or some combination of these methods or, in future, methods that might make use of new satellite positioning systems such as the European GALILEO system. The mobile terminal could also retrieve previous location information and predict future location information through immediately preceding location readings or through historical patterns. For example, the same path may be taken most mornings in a work commute such that the next day, the mobile terminal may predict another work commute similar to prior commutes or may predict such another work commute when location changes start to replicate what was observed in previous commutes.  
      The terminal compares the location information with the location criteria for the broadcast information and determines whether the information should be presented to the user and, if so, with what priority. Once the terminal has determined whether the user should be presented with, or alerted to the presence of, the information and has possibly obtained a particular priority, the terminal may treat the information the same as if the network had made this determination and provided any priority information—e.g., it may alert the user immediately for any particularly urgent information or may provide less urgent possibly delayed alerting for lower priority information. The Table lists exemplary customized alerts for various classes of location-based messages. The user can interact with an application or web screen or a screen of the wireless terminal to configure alerts. In some cases, the alert may be relayed by the terminal to other devices in a Personal Area Network (e.g., TV or computer) to increase the probability of the user perceiving the alert.  
               TABLE                          Exemplary Message Alerts                     Message Class   Alert               General Weather Warning   Vibration       General Traffic Jam   Vibration       General Advertisement   Screen Message with Periodic Tone       Specific Weather Warning   Tone &amp; Message displayed on other devices           in a Personal Area Network       Specific Traffic Jam   Tone &amp; Vibration       Custom Advertisement   Status Light &amp; Tone With Over 5 Ads                  
 
      In the event that the mobile terminal performs filtering based on location information included in the information being broadcast and location information for terminal, it may be possible to determine whether the information should be provided to the user before all the information has been received. If the determination is not to present the information to the mobile terminal, it would be possible for the terminal to discontinue receipt of the broadcast information, thereby potentially saving terminal resources (e.g., battery, processor, memory) and a possible monetary charge for receiving the broadcast information (which may have unnecessarily used reverse link resources) and/or freeing up terminal resources for other tasks.  
      It would also be possible to employ filtering in both the network and terminal—for example, coarse filtering in the network and away from the mobile terminal based on approximate location information indicated by terminals presence in particular cells and cell-sectors and finer more comprehensive filtering in terminals. Both modes of filtering could also be employed to support subsets of terminals that could not support filtering themselves—in that case, the network might perform filtering for these subsets of terminals with other terminals that were capable of performing filtering doing this for themselves.  
      In some cases, the communication network may have little or no knowledge of the locations and/or identities of prospective wireless terminals. No knowledge of location could occur, for example, with a user whose terminal was accessing a WLAN when the WLAN or WLAN location was unknown or not reliably known to the wireless network. No knowledge of identity and location may occur with any wireless technology when potential recipient mobile terminals act passively (e.g., when the wireless terminal is not required to support a call or other user related activity) and does not identify themselves to the network as potential recipients for a particular broadcast. This may occur to reduce signaling overhead or if the broadcast/multicast solution is not able to identify some or all recipient users. In such cases, the network may need to broadcast information to a much larger set of mobile terminals than the intended recipients and rely on location filtering in the mobile terminals to appropriately accept the information and pass it to the users.  
      In another embodiment, the network or mobile terminal may employ a database or other method to convert geographic location information (e.g. latitude/longitude) into a civic form (e.g. street address, building identification) and compare this with any civic related location criteria. The network or mobile terminal may also employ both civic and geographic (e.g. latitude/longitude) types of location information and criteria. For example, in order to determine if a moving mobile terminal is likely to reach a blockage on a major highway before the blockage is likely to be cleared, it may be necessary to establish that the mobile terminal is actually traveling along the highway by means of successive geographic location fixes whose conversion into a civic form, or comparison with civic mapping information, verifies locations along the highway. Other civic mapping could include recognizing country/state/county/city boundaries. Messages could be realized on mobile terminals according to their location relative to the civic boundaries.  
      Some exemplary applications are listed below:  
      (a) Provision of a localized emergency notification service to notify or warn users in a building, in a particular section of a building or in any other area of a possible or actual threat or danger—e.g., fire, terrorism, tornado, earthquake, storm surge, industrial accident, structural failure, and/or impairment to a building, road, bridge, or tunnel.  
      (b) Notify users of current or future expected traffic conditions. The notification could also include possible alternative driving routes.  
      (c) Notify users of public transport of current or expected delays and cancellations and possibly indicate alternative routes and services.  
      (d) Notify users of current or future weather conditions at their current location or in future prospective locations.  
      (e) Access users who were previously in a certain location or vicinity—for example who may have been witnesses to a traffic accident or may have been in contact with a contagious disease.  
      (f) Advertise to users within a particular shop, shopping mall, recreational area or any other location (e.g., airport, hotel, railway station, and/or sports or concert arena) of products, services, sales and other opportunities.  
      (g) Provide travel or sightseeing information to users at a particular location or heading towards a particular location.  
      Referring first to  FIG. 1A , a block diagram of an embodiment of a communication system  100 - 1  is shown. Satellites  132 , for example, are used by the mobile terminals  128  to determine their location using a Satellite Positioning System (SPS). These satellites  132  may be from a Global Positioning System (GPS), Galilleo, GLONASS, NAVSTAR, a system that uses satellites from a combination of these systems, or any SPS developed in the future. As used herein, an SPS will also be understood to include pseudolite systems.  
      A number of mobile terminals  128  communicate with a number of base stations  120 . Mobile terminal refers to a device such as a cellular telephone, wireless communication device, user equipment, or other personal communication system (PCS) device. A base station controller  111  communicates with the base stations  120 . A system controller  112  communicates directly or indirectly with the base station controller  111 . Some embodiments may have any number of base station controllers  111  and base stations  120 .  
      A multi-destination database  110  holds messages that are meant for broadcast or multicast to one or more mobile terminals  128 . Each message has a corresponding geographic location criteria defined in the geographic location criteria database  116 . The geographic location criteria can be a point, an area, a volume, an altitude, and/or a civic boundary. This embodiment chooses the base stations  120  for a particular message that generally correspond to a predetermined geographic location criteria. Each base station  120  corresponds to a cell sector in this embodiment. The cell sectors that correspond to the geographic location criteria are determined and their corresponding base stations  120  are selected. Those base stations  120  broadcast the message and the mobile terminals  128  in the geographic location criteria accept the message. The various data stores and databases could be any storage medium that is machine-readable.  
      With reference to  FIG. 1B , a block diagram of another embodiment of the communication system  100 - 2  is shown. In this embodiment, those mobile terminals  128  within a predetermined geographic location criteria are multicasted the message by choosing the appropriate base stations  120  and communication channels.  
      This embodiment knows the location of each mobile terminal  106  whose locations are stored in a mobile terminal location database  106 . In this embodiment, the system controller  112  or some other place in the communication network  100 - 2  determines the mobile terminal locations. Position determination techniques described herein may be used for various wireless communication networks such as a wireless wide area network (WWAN), a wireless local area network (WLAN), a wireless personal area network (WPAN), and so on. The term “network” and “system” are often used interchangeably. A WWAN may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Access (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency Division Multiple Access (OFDMA) network, a Single-Carrier Frequency Division Multiple Access (SC-FDMA) network, and so on. A CDMA network may implement one or more radio access technologies (RATs) such as cdma2000, Wideband-CDMA (W-CDMA), and so on. Cdma2000 includes IS-95, IS-2000, and IS-856 standards. A TDMA network may implement Global System for Mobile Communications (GSM), Digital Advanced Mobile Phone System (D-AMPS), or some other RAT. GSM and W-CDMA are described in documents from a consortium named “3rd Generation Partnership Project” (3GPP). Cdma2000 is described in documents from a consortium named “3rd Generation Partnership Project 2” (3GPP2). 3GPP and 3GPP2 documents are publicly available. A WLAN may be an IEEE 802.11x network, and a WPAN may be a Bluetooth network, an IEEE 802.15x, or some other type of network. The techniques may also be used for any combination of WWAN, WLAN and/or WPAN.  
      Referring next to  FIG. 2A , a block diagram of an embodiment of a mobile terminal  128 - 1  is shown. Under the control of the processor  204 , the mobile terminal  128  can perform several functions. This embodiment is capable of independently determining location with a location determination circuit  208 . A wireless transceiver  216  receives messages for storage in an accepted message database  220 . The predetermined geographic location criteria is received as metadata in the same message or separate from the message and stored in the location criteria database  118 . Alert criteria  224  are applied against the accepted messages to notify the user with alert circuitry  212 .  
      With reference to  FIG. 2B , a block diagram of another embodiment of the mobile terminal  128 - 2  is shown. This embodiment does not determine location by itself, but uses other parts of the communication system  100  to determine location. Messages are multicasted to the mobile terminal  128 - 2  such that if received by the wireless transceiver, they are processed for alerts.  
      Referring next to  FIG. 2C , a block diagram of yet another embodiment of the mobile terminal  128 - 3  is shown. This embodiment does not store alert criteria local to the mobile terminal  128 - 3 . The alert to use is sent with the message or in a separate message. The alert circuitry  212  performs the alert specified remotely in the message. A user of the mobile terminal  128 - 3  can set up the alerts with the system controller such that the selected alerts can be implemented without the mobile terminal  128 - 3  having to store the various alerts.  
      With reference to  FIG. 3A , a diagram of an embodiment of a geographic layout  300 - 1  is shown depicting a number of mobile terminals  128 . The resolution of the communication system resolves the geographic location to a particular cell  304 - 2  such that the corresponding base stations  120  can send the message. The predetermined geographic location  304 - 1  is smaller than the cell area in this embodiment. Three mobile terminals  128 - 1 ,  128 - 2 ,  128 - 3  are within the predetermined geographic location criteria  304 - 1  such that they accept the message for processing. Some mobile terminals  128 - 4 ,  128 - 5 ,  128 - 6  receive the message as they are in the cell area, but do not use the message after checking their location against the predetermined geographic location criteria  304 - 1 .  
      Referring next to  FIG. 3B , a diagram of another embodiment of a geographic layout  300 - 2  is shown depicting a number of mobile terminals  128 . This embodiment shows the bearing of travel and speed with an arrow and length of arrow, respectively. The geographic location criteria in this embodiment is a particular road for traffic going in a certain direction(s). For example, mobile terminals  128 - 1  and  128 - 2  are traveling down the same road in one direction and mobile terminals  128 - 3  and  128 - 6  are traveling in the opposite direction. A geographic location criteria can be defined to include  128 - 1  and  128 - 2  and/or  128 - 3  and  128 - 6 . The message sent to the mobile terminals of the geographic location criteria could be a traffic alert that is germane to the street traveled upon. Seven mobile terminals  128  are within the communication range  304  of the selected base station  120 , but only two are traveling in the correct direction to be included in the geographic location for this embodiment.  
      With reference to  FIG. 3C , a diagram of yet another embodiment of a geographic layout  300 - 3  is shown depicting a number of mobile terminals  128 . This embodiment broadcasts a message to a third  304 - 2  of a circular cell emanating from the base station. The message indicates the geographic location criteria  304 - 1  is limited to a square section within that third  304 - 2 . Only two mobile terminals  128 - 1 ,  128 - 2  would accept and use the message for a possible alert. Other mobile terminals  128  could receive the message but would discontinue receipt or ignore it or provide it to the user with low priority when the mobile terminal&#39;s location is determined to be outside the geographic location criteria.  
      Referring next to  FIG. 4A , a flowchart of an embodiment of a process  400 - 1  for filtering multi-destination messages is shown. The depicted portion of the process begins in block  404  where alerts are configured for various message types. This configuration could take place with the mobile terminal  128  or through an application or web interface to the system controller  112 . A message is received by the system controller  112  with the location criteria for the message in block  408 . The message and location criteria may be stored in databases  110 ,  116 . Transmission resources are determined for the geographic location criteria in block  412 , which could include selecting a number of base stations and/or a number of groupings of base stations that cover the geographic location criteria.  
      This embodiment broadcasts the message with embedded location criteria metadata in block  416 . The message is received by one or more mobile terminals  128  in block  420 . The mobile terminal  128  either determines its location or uses a location externally relayed to the mobile terminal  128  in block  424 . The geographic location criteria is analyzed in block  428  and a determination is made in block  432  to see if the location of the mobile terminal  128  satisfies the criteria. The process  400 - 1  ends where the location criteria is not satisfied and processing of the message stops.  
      An accepted message is further processed to determine and present any appropriate alerts. In block  436 , the class of the message is determined. These classes correspond to groupings of message types configured in block  404 . For example, a severe weather alert may be classified at the same level as an airplane delay notice. Once the class is known, the configured alert can be delivered in block  440 . For example, the class may result in vibratory alert and screen message. Once the alert is delivered, processing ends in this embodiment. Some embodiments may continue to deliver the alert until turned off permanently or temporarily.  
      With reference to  FIG. 4B , a flowchart of another embodiment of a process  400 - 2  for filtering multi-destination messages is shown. This embodiment is performed the same as the embodiment of  FIG. 4A  through block  416 . Processing goes from block  416  to block  424  where the location of the mobile terminal is determined using the mobile terminal  128  alone, external to the mobile terminal  128  or with a combination of the mobile terminal and other components. Receipt of the message is begun in block  421 .  
      Once enough of the message is received to know the geographic location criteria or the geographic location criteria are otherwise received, the criteria are analyzed in block  428 . Where the location criteria are not satisfied by the location of the mobile terminal  128 , the remainder of the message is not received and the process  400 - 2  ends. Should the criteria be satisfied, the remaining portions of the message are received in block  423  before completing blocks  436  and  440  in the same manner as the embodiment of  FIG. 4A .  
      Referring next to  FIG. 4C , a flowchart of yet another embodiment of a process  400 - 3  for filtering multi-destination messages is shown. This embodiment behaves the same as the embodiment of  FIG. 4A  through block  412 . In block  414 , the mobile terminals within the location criteria are determined  414 . The system controller  112  knows the location of each mobile terminal and can make the determination of which ones qualify under the location criteria. The message is multicasted to one or more mobile terminals  128  using the appropriate base stations  120 .  
      Once the message is received in block  420 , it is presumed to qualify under a location criteria. Processing continues through block  436  and  440  to analyze and deliver the alert. After block  440 , the process  400 - 3  ends.  
      With reference to  FIG. 5 , a block diagram of an embodiment of a communication system  500  for filtering multi-destination messages is shown. The communication system includes means for receiving messages  504 , first means for determining  508 , means for transmitting  512 , and second means for determining  516 . The means for receiving messages  504  serves to receives messages intended for at least some of a plurality of wireless terminals, where the plurality of wireless terminals comprise a wireless terminal. The first means for determining  508  serves to determine a subset of a plurality of transmitters, where the subset generally correspond to a predetermined geographic criteria. The means for transmitting  512  serves to transmit the message wirelessly to a plurality of wireless terminals using the subset. The second means for determining  516  serves to determine if the wireless terminal corresponds to the predetermined geographic criteria.  
      Specific details are given in the above description to provide a thorough understanding of the embodiments. However, it is understood that the embodiments may be practiced without these specific details. For example, circuits may be shown in block diagrams in order not to obscure the embodiments in unnecessary detail. In other instances, well-known circuits, processes, algorithms, structures, and techniques may be shown without unnecessary detail in order to avoid obscuring the embodiments.  
      Also, it is noted that the embodiments may be described as a process which is depicted as a flowchart, a flow diagram, a data flow diagram, a structure diagram, or a block diagram. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations may be re-arranged. A process is terminated when its operations are completed, but could have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc. When a process corresponds to a function, its termination corresponds to a return of the function to the calling function or the main function.  
      Furthermore, embodiments may be implemented by hardware, software, scripting languages, firmware, middleware, microcode, hardware description languages, and/or any combination thereof. When implemented in software, firmware, middleware, scripting language, and/or microcode, the program code or code segments to perform the necessary tasks may be stored in a machine readable medium such as a storage medium. A code segment or machine-executable instruction may represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a script, a class, or any combination of instructions, data structures, and/or program statements. A code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, and/or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted via any suitable means including memory sharing, message passing, token passing, network transmission, etc.  
      Implementation of the techniques described above may be done in various ways. For example, these techniques may be implemented in hardware, software, or a combination thereof. For a hardware implementation, the processing units may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described above, and/or a combination thereof.  
      For a firmware and/or software implementation, the methodologies may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. Any machine readable medium tangibly embodying instructions may be used in implementing the methodologies described herein. For example, software codes may be stored in a memory, for example the memory of mobile terminal, and executed by a processor, for example the microprocessor of a modem. Memory may be implemented within the processor or external to the processor. Memory may be implemented within the processor or external to the processor. As used herein the term “memory” refers to any type of long term, short term, volatile, nonvolatile, or other storage medium and is not to be limited to any particular type of memory or number of memories, or type of media upon which memory is stored.  
      Moreover, as disclosed herein, the term “storage medium” may represent one or more devices for storing data, including read only memory (ROM), random access memory (RAM), magnetic RAM, core memory, magnetic disk storage mediums, optical storage mediums, flash memory devices and/or other machine readable mediums for storing information. The term “machine-readable medium” includes, but is not limited to portable or fixed storage devices, optical storage devices, wireless channels, and/or various other mediums capable of storing, containing or carrying instruction(s) and/or data.  
      While the principles of the disclosure have been described above in connection with specific apparatuses and methods, it is to be clearly understood that this description is made only by way of example and not as limitation on the scope of the disclosure.