Triggered location services

Abstract

Techniques for supporting triggered location services are described. In one design, at least one location related measurement for a terminal may be obtained and used to detect for a trigger event. For an equidistance triggered service, a trigger event may be declared if the distance traveled by the terminal exceeds a predefined distance. For a relative terminal to terminal triggered service, a trigger event may be declared if the terminal is inside or outside, or enters, or leaves a moving geographical target area defined by a reference terminal. For a velocity triggered service, a trigger event may be declared if the maximum velocity of the terminal exceeds a predefined velocity. For a time-distance-velocity combination triggered service, a trigger event may be declared based on distance traveled by the terminal, velocity of the terminal, and time since the last report. A report may be sent if a trigger event has occurred.

1 . A method of supporting location services, comprising:
 sending a request by a first terminal for velocity of a second terminal; and   receiving the velocity of the second terminal at the first terminal.   
     
     
         2 . The method of  claim 1 , wherein the sending the request comprises sending the request to a location center, and wherein the receiving the velocity of the second terminal comprises receiving the velocity of the second terminal from the location center. 
     
     
         3 . The method of  claim 1 , wherein the sending the request comprises sending the request to a location center, and wherein the receiving the velocity of the second terminal comprises receiving the velocity of the second terminal directly from the second terminal without going through the location center. 
     
     
         4 . The method of  claim 1 , wherein the receiving the velocity of the second terminal comprises receiving the velocity of the second terminal a plurality of times based on the request. 
     
     
         5 . The method of  claim 1 , wherein the velocity of the second terminal is determined based on measurement for a signal exchanged between the first terminal and the second terminal. 
     
     
         6 . An apparatus supporting location services, comprising:
 means for sending a request by a first terminal for velocity of a second terminal; and   means for receiving the velocity of the second terminal at the first terminal.   
     
     
         7 . The apparatus of  claim 6 , wherein the means for sending the request comprises means for sending the request to a location center, and wherein the means for receiving the velocity of the second terminal comprises means for receiving the velocity of the second terminal from the location center. 
     
     
         8 . The apparatus of  claim 6 , wherein the means for receiving the velocity of the second terminal comprises means for receiving the velocity of the second terminal a plurality of times based on the request. 
     
     
         9 . An apparatus supporting location services, comprising:
 at least one processor configured to send a request by a first terminal for velocity of a second terminal, and to receive the velocity of the second terminal at the first terminal.   
     
     
         10 . The apparatus of  claim 9 , wherein the at least one processor is further configured to send the request to a location center, and to receive the velocity of the second terminal from the location center. 
     
     
         11 . A computer program product, comprising:
 a computer-readable medium comprising:
 code to cause at least one computer to send a request by a first terminal for velocity of a second terminal, and 
 code to cause the at least one computer to receive the velocity of the second terminal at the first terminal. 
   
     
     
         12 . The computer program product of  claim 11 , further comprising code to send the request to a location center, and to receive the velocity of the second terminal from the location center.