Method for improving emergency response time for mobile callers
A method and a system for improving emergency response time for mobile callers can be configured to take advantage of knowledge regarding numerous devices and their states of services they offer. Embodiments of the method and system can be adapted to optimize the selection of one or more alternative destinations for a caller who may be moving while also avoiding unnecessary call re-routings.
1. A method for improving emergency response time for mobile callers, comprising:
queuing, by a Public Safety Answering Point (PSAP) element, an emergency call having a first geolocation and an incident identifier (incidentID) associated with a caller,
sending, by the PSAP element, a first rebid request to a Location Information Server (LIS) to get information about the current geolocation of the caller,
identifying, by the PSAP, if the first geolocation of the caller has changed;
in response to identifying that the first geolocation of the caller has changed:
receiving, by the PSAP element, a second geolocation of the caller from the LIS,
pinging, by the PSAP element, a Location to Service Translation, (LoST) element with the second geolocation of the caller,
receiving, by the PSAP element, a destination PSAP (dPSAP) for the second geolocation of the caller from the LoST element, and
routing the call to dPSAP.
2. The method according to claim 1 , wherein the first geolocation having a radius r<x in relation to an incident scene and the second geolocation having a radius r>x in relation to the incident scene, wherein x is a distance parameter.
3. The method according to claim 2 , wherein the sending of the first rebid request is periodically performed with a preconfigured polling frequency.
4. The method of claim 1 , further comprising:
in response to identifying the caller as a moving caller, increasing a polling frequency; and
in response to identifying the caller as a non-moving caller, decreasing the polling frequency.
5. The method according to claim 1 , wherein an initial time, t 0 , is a time the call is routed at the PSAP and a first time, t 1 , is a time the call is queued in the queue of the PSAP, wherein t 1 >t 0 .
6. The method of claim 1 , further comprising:
pinging an ESRP element, by the PSAP element, with the incidentID, the first geolocation, the second geolocation, and the dPSAP element, to identify whether other emergency calls were routed from the ESRP element,
identifying, by the ESRP element, if another functional PSAP (fPSAP) can handle calls with the incidentID for the first geolocation or the second geolocation,
receiving, by the PSAP element, at least one fPSAP destination from the ESRP element for the incidentID,
identifying, by the PSAP element, if the dPSAP matches any fPSAP destination, and, in response to no match or the PSAP element has not received any fPSAP destination form the ESRP,
routing call to dPSAP, otherwise
routing call to the fPSAP.
7. The method according to claim 6 , wherein an equation to identify an appropriate fPSAP is used by the ESRP element, the equation being:
lim
x
→
"\[Rule]"
geo
1
δ
→
"\[Rule]"
t
0
f
(
x
,
t
)
=
0
,
f
(
x
,
t
)
=
x
-
x
or
+
(
t
-
t
0
)
with x is a distance parameter converging to the first geolocation, geo 1 , δ is a time parameter converging to t 0 , t is time and x or is the geolocation from which the call was placed at t 0 .
8. The method according to claim 6 , comprising:
using a preconfigured policy rule function (PRF) to identify an appropriate dPSAP and/or fPSAP.
9. The method according to claim 6 , wherein:
in response to no match or the PSAP element having not received any fPSAP destination from the ESRP, the method comprising:
identifying, by the PSAP, if the absolute queue position or the relative queue position of the call in the dPSAP is smaller as in its own queue, and, if yes, routing call to the dPSAP; and
in case there is a match, the method comprising:
identifying, by the PSAP, if the absolute queue position or the relative queue position of the call in the fPSAP is smaller as in its own queue and, if yes, routing call to the fPSAP, and in any other case, remaining the call in the queue of the PSAP element.
10. The method according to claim 9 , wherein the relative queue position is calculated by use of:
rPos
PSAPn
=
Pos
PSAPn
mQ
PSAPn
with rPos PSAPn is the relative queue position of a call in PSAPn, Pos PSAPn is the current queue position of a call, mQ PSAPn is the maximum queue size and PSAPn is a certain PSAP with identifier n.
11. The method of claim 1 , wherein the LoST element is at least one of a LoST server, an Emergency Call Routing Function (ECRF) server or a Location Validation Function (LVF) server and/or wherein these elements use at least one of a ECRF protocol, a LoST protocol or a LVF, protocol.
12. A system for improving emergency response time for mobile callers, wherein the system is configured to perform the method of claim 1 .
13. The system according to claim 12 , wherein the system comprising an ESRP element, an ECRF or LoST element, a LIS element, a PSAP element and a dPSAP element.
14. The system according to any of the claim 13 wherein the system further comprising a fPSAP element, a Policy Store Server, PSS element and/or Logging Client.
15. A communication apparatus comprising:
a device having a processor connected to a non-transitory memory and at least one transceiver, the device configured to perform a method comprising:
queuing an emergency call having a first geolocation and an incident identifier (incidentID) associated with a caller,
sending a first rebid request to a Location Information Server (LIS) to get information about the current geolocation of the caller,
in response to identifying that the first geolocation of the caller has changed based on the information about the current geolocation of the caller:
receiving a second geolocation of the caller from the LIS,
pinging a Location to Service Translation (LoST) element with the second geolocation of the caller,
receiving a destination PSAP (dPSAP) for the second geolocation of the caller from the LoST element, and
routing the call to the dPSAP.