LTE : IMS Emergency Call in LTE Network
Emergency service
is provided to the Lte enabled UE in the following situations:
- User calls an emergency number.
- UE is in the state where network is not available to serve the UE.
- User can make IMS emergency call even if does not have a SIM card.
- UE is in limited service state i.e limited service state where UE is not allowed to call or roam.
-
To make an IMS Emergency call, UE sends Attach type as Emergency attach
and request type as Emergency in Attach Request.
-
MME(Lte Network) should be
configured with the Emergency support enabled otherwise MME
rejects the emergency call.
-
Following are the various configurations in MME according to which MME
proceeds the Emergency call.
Emergency
Type
· IMSI Authentication mandatory: Emergency call is
successful only when
IMSI comes in Attach Request and Authentication from HSS
should be successfully done for this IMSI.
· IMSI Mandatory Authentication optional:
Emergency call is successful
only when IMSI comes in Attach Request and
Authentication from HSS
needs not to be successfully done.In case authentication fails, network keeps
tracking of that IMSI's that are unauthenticated.
tracking of that IMSI's that are unauthenticated.
· IMSI Optional IMEI mandatory: In this case UE is
identified in the network
by its IMEI only.UE may or may not send IMSI in Attach Request. If UE sends IMSI
it is not neccassary be authenticated.
it is not neccassary be authenticated.
· Emergency not supported.
Emergency APN
That is needed to identify the PGW
for emergency call.
Emergency QoS
That is
required by the MME only when the UE
authentication is optional.
Otherwise HSS sends it in
Subscription Data.
Emergency call
ReplyDeleteCan you provide the spec number which you got this info.
ReplyDeleteRefer Spec 23401 v10 and 24301 v10.
DeleteThanks for you words.
ReplyDeleteCRM) programming this incorporates client examination to screen and follow up available to come back to work hold up times or surrendered calls. Callnovo
ReplyDelete