Location information for a mobile station

1. A method comprising:

communicating a first message to a mobile station to move to a traffic channel in response to a callback to the mobile station by at least one of an emergency services entity or a law enforcement entity;

communicating, to the mobile station and over the traffic channel, a second message containing:

an indicator having two or more available alternate states including a first state to indicate that the second message is related to at least one of an emergency-related location service or a law enforcement-related service, and a second state to indicate that the second message is related to a value-added service; and

an information element separate from the indicator and within the second message that indicates a location request for a location of the mobile station;

receiving an indication of an acceptance of the location request by the mobile station;

receiving information via the traffic channel regarding the location of the mobile station.

2. The method of claim 1 , wherein the second message containing the indicator comprises one of a general page message (GPM) containing the indicator or a universal page message (UPM) containing the indicator.

3. The method of claim 1 , wherein communicating the second message comprises sending the information element to identify service option 35 or service option 36 , and a different information element that includes the indicator to indicate whether the page is related to the emergency-related location service or law enforcement-related location service.

4. The method of claim 3 , further comprising a base station setting a state of the indicator to one of the two or more available alternate states based on a state of a field in a paging request from a mobile switching center indicating whether the paging request is related to the emergency-related location service or the law enforcement-related service.

5. The method of claim 1 , wherein the second message comprises a position determination data message (PDDM) containing an indication of whether the PDDM is related to at least on of an emergency-related location service or a law enforcement-related location service.

6. The method of claim 5 , wherein sending the PDDM message comprises sending an TIA/EIA/IS-801 PDDM message.

7. The method of claim 5 , further comprising:

receiving a position request containing a field indicating whether the position request is related to at least one of the emergency-related location service and the law enforcement-related location service; and

setting a state of the indication in the PDDM based on a state of the field in the position request.

8. The method of claim 1 , wherein said communicating comprises communicating the second message to a mobile station from a base station to initiate a call with the mobile station.

9. The method of claim 1 , wherein said communicating is performed by a base station in response to receipt by the base station of a paging request from a system controller, wherein the paging request contains an indication of whether the paging request is related to at least one of the emergency-related location service or the law enforcement-related location service.

10. A method, comprising:

receiving at a mobile station a first message instructing the mobile station to move to a traffic channel in response to a callback from at least one of an emergency services entity or a law enforcement entity;

causing the mobile station to move to the traffic channel;

receiving a second message by the mobile station and over the traffic channel, the second message containing:

an indicator having two or more available alternate states including a first state to indicate that the second message is related to at least one of the emergency-related location service or the law enforcement-related location service, and a second state to indicate that the second message is related to a value-added service; and

an information element within the second message that indicates that the message is location-related;

examining the second message to determine whether to accept the message based on association of the second message with either an emergency-related location service or a law enforcement-related location service;

responding to the second message by sending a response over the traffic channel indicating acceptance of a location service-related option specified in the second message.

11. The method of claim 10 , wherein said examining comprises:

ascertaining that the indicator is set to the first state.

12. The method of claim 10 , further comprising:

the mobile station communicating position determination data messages (PDDMs) on the traffic channel with a position determination entity (PDE);

the mobile station determining whether one or more received PDDMs are related to the emergency-related location service or law enforcement-related location service; and

in response to determining that the one or more received PDDMs are related to the emergency-related location service or law enforcement-related location service, the mobile station accepting request elements in the one or more received PDDMs.

13. The method of claim 10 , wherein receiving the second message comprises receiving a page from a base station to initiate a call with the mobile station, the page containing the indicator set to the first state to indicate that the page is related to at least one of the emergency-related location service or the law enforcement-related location service.

14. A mobile device comprising:

one or more processors;

at least one machine-readable storage memory storing instructions that are executable by the one or more processors to cause the mobile device to perform operations comprising:

receiving messaging to cause the mobile device to move to a traffic channel of a wireless communications network in response to a callback by at least one of an emergency services entity or a law enforcement entity:

receiving a location request on the traffic channel containing an indication that the location request is related to at least one of an emergency-related location service or a law enforcement-related location service;

sending location information of the mobile device in response to the location request;

receiving a page containing an indication that the page is associated with at least one of an emergency-related location service or a law enforcement-related location service; and

responding to the page by accepting a service option of the page based on the indication.

15. A system comprising:

an interface to communicate messages to a mobile station;

a controller having a processor; and

one or more computer-readable storage media storing instructions that are executable by the processor to cause the system to perform operations including:

communicating a first message to the mobile station to move to a traffic channel in response to a callback to the mobile station by at least one of an emergency services entity or a law enforcement entity;

configuring a second message, including setting a first indicator in the second message to a state of two or more available alternate states of the indicator, the two or more states including a first state that indicates that the second message is related to at least one of an emergency-related location service and or a law enforcement-related location service, and a second state that indicates that the second message is related to a value-added service;

including within the second message a second indicator indicating a location request for a location of the mobile station;

communicating the second message over the traffic channel to the mobile station;

receiving an indication of an acceptance of the location request by the mobile station; and

receiving location information from the mobile station over the traffic channel.

16. The system of claim 15 , wherein the controller is configured to send one or more of the first message or the second message to the mobile station in response to an idle-mode query initiated by an emergency services entity to the mobile station.

17. The system of claim 15 , comprising a base station including the interface and controller, wherein the second message comprises a page sent over a wireless link from the base station to the mobile station to initiate a call with the mobile station.

18. The system of claim 15 , wherein the controller is configured to send data over a traffic channel, the data comprising a position determination data message (PDDM) containing an indication of whether the PDDM is related to emergency services.

19. A mobile station comprising:

one or more processors; and

one or more computer-readable storage media storing instructions that are executable by the one or more processors to perform operations including:

moving to a traffic channel in response to a callback to the mobile station by at least one of an emergency services entity or a law enforcement entity;

receiving a page over the traffic channel;

identifying within the page an information element that specifies that the page is related to a location request;

identifying within the page an indicator having two or more available alternate states including a first state to indicate that the page is related to at least one of an emergency-related location service or a law enforcement-related service, and a second state to indicate that the page is related to a value-added service; and

communicating over the traffic channel an indication of an acceptance of the location request, and location information for a location of the mobile station.

20. The mobile station of claim 19 , wherein the operations include accepting the received page in response to the indicator indicating that the page is related to the emergency-related location service or law enforcement-related location service.

21. The mobile station of claim 19 , comprising one of a mobile phone, a portable computer with a wireless modem, a wireless-enabled personal digital assistant (PDA), and a global positioning system (GPS) device.

22. The mobile station of claim 19 , wherein the page received by the mobile station is sent by a base station to initiate a call with the mobile station.

23. The mobile station of claim 19 , wherein the information element is separate from the indicator.