METHOD AND SYSTEM FOR ESTABLISHING AN EMERGENCY CALL IN A COMMUNICATIONS SYSTEM

摘要

A method for establishing an emergency call between a user equipment within a radio coverage area and one of at least two points able to answer the call, the method comprising: receiving said emergency call request; determining a first estimate of the position of said user equipment within said coverage area; interrupting said call establishment by triggering a control point; and using the control point to select, based on said first position estimate, which one of said at least two answering points the call is established with.

主权项

1. A method for establishing an emergency call between a user equipment within a radio coverage area and one of at least two answering points able to answer the call, each of the at least two answering points including a service zone within the radio coverage area, the method comprising:
invoking, at the user equipment, the call; transmitting, from the user equipment, first location measurement signals for use in determining a first estimate of the position of the user equipment within the radio coverage area, wherein the first estimate has sufficient accuracy to identify the service zone of the at least two answering points that the user equipment lies within; and transmitting, from the user equipment, second location measurement signals for use in determining a second estimate of the position of the user equipment within the radio coverage area, wherein the second estimate is more accurate than the first estimate.