IP Library › Granted Patent US 11,277,881
Granted Patent B2
US 11,277,881 · App. 16/322,695 · Granted Mar 15, 2022

Emergency services support for a device which does not have a valid subscription

Inventors: Kundan Tiwari (Chennai, IN); Toshiyuki Tamura (Tokyo, JP)
Assignee: NEC CORPORATION
H04W76/50H04L65/1016H04W48/16H04W48/18H04W88/06
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Quick Facts
Patent No.
US 11,277,881
App. No.
16/322,695
Filed
Feb 1, 2019
Granted
Mar 15, 2022
Kind
B2
Art Unit
2632
USPC
455/404.1
Abstract

This disclosure is related to a procedure to provide emergency services support for a UE which does not have a valid subscription for the serving PLMN. This disclosure more specifically provides procedure to support IMS emergency call or eCall support for a UE which is in limited state on a E-UTRA cell is connected to both EPC and 5GCN.

Claims (50)

1. A method of a user equipment, the method comprising:

receiving system information block type 1 message that is broadcasted in a cell operated by an Access Network node that is connected to both Evolved Packet Core (EPC) and 5th Generation Core (5GC), the system information block type 1 message indicative of whether the cell supports Internet Protocol (IP) Multimedia Subsystem (IMS) emergency services via each of the EPC and the 5GC for the user equipment in limited service state, by including at least one of:

ims-EmergencySupport information indicating that the cell supports IMS emergency services via the EPC for the user equipment in limited service state, and

ims-EmergencySupport5GC information indicating that the cell supports IMS emergency services via the 5GC for the user equipment in limited service state; and

determining that the cell supports IMS emergency services via at least one of the EPC and the 5GC, based on both of:

whether or not the ims-EmergencySupport information is present in the system information block type 1 message, and

whether or not the ims-EmergencySupport5GC information is present in the system information block type 1 message, wherein

the method further comprises:

initiating IMS emergency services to the EPC only, in a case where the cell supports IMS emergency services via the EPC and the cell does not support IMS emergency services via the 5GC,

initiating IMS emergency services to the 5GC only, in a case where the cell supports IMS emergency services via the 5GC and the cell does not support IMS emergency services via the EPC, or

initiating IMS emergency services to either the EPC or the 5GC, in a case where the cell supports IMS emergency services via both the EPC and the 5GC, wherein the initiating IMS emergency services to the EPC is performed upon determining, by the UE, that IMS emergency services on the 5GC would fail, wherein the system information block type 1 message:

indicates that the cell supports IMS emergency services via the EPC based on a value of the ims-EmergencySupport information being set to TRUE,

indicates that the cell does not support IMS emergency services via the EPC based on the ims-EmergencySupport information being absent from the system information block type 1 message,

indicates that the cell supports IMS emergency services via the 5GC based on a value of the ims-EmergencySupport5GC information being set to TRUE,

indicates that the cell does not support IMS emergency services via the 5GC based on the ims-EmergencySupport5GC information being absent from the system information block type 1 message, and

indicates that the cell supports IMS emergency services via both the EPC and the 5GC based on the value of the ims-EmergencySupport information being set to TRUE and the value of the ims-EmergencySupport5GC information being set to TRUE.

2. The method according to claim 1 , wherein

the initiating IMS emergency services to the EPC is performed in a case where the cell supports IMS emergency services via the EPC and the cell does not support IMS emergency services via the 5GC, or

the initiating IMS emergency services to the 5GC is performed in a case where the cell supports IMS emergency services via the 5GC and the cell does not support IMS emergency services via the EPC.

3. The method according to claim 1 , further comprising:

not initiating IMS emergency services to the 5GC, in a case where the cell supports IMS emergency services via the EPC and the cell does not support IMS emergency services via the 5GC; and

not initiating IMS emergency services to the EPC, in a case where the cell supports IMS emergency services via the 5GC and the cell does not support IMS emergency services via the EPC.

4. The method according to claim 1 , wherein

the initiating IMS emergency services to the EPC is performed upon determining, by the user equipment, that the IMS emergency services on the 5GC have failed.

5. A user equipment comprising:

a transceiver; and

a controller configured to:

receive, via the transceiver, system information block type 1 message that is broadcasted in a cell operated by an Access Network node that is connected to both Evolved Packet Core (EPC) and 5th Generation Core (5GC), the system information block type 1 message indicative of whether the cell supports Internet Protocol (IP) Multimedia Subsystem (IMS) emergency services via each of the EPC and the 5GC for the user equipment in limited service state, by including at least one of:

ims-EmergencySupport information indicating that the cell supports IMS emergency services via the EPC for the user equipment in limited service state, and

ims-EmergencySupport5GC information indicating that the cell supports IMS emergency services via the 5GC for the user equipment in limited service state; and

determine that the cell supports IMS emergency services via at least one of the EPC and the 5GC, based on both of:

whether or not the ims-EmergencySupport information is present in the system information block type 1 message, and

whether or not the ims-EmergencySupport5GC information is present in the system information block type 1 message, wherein

the controller is further configured to:

initiate IMS emergency services to the EPC only, in a case where the cell supports IMS emergency services via the EPC and the cell does not support IMS emergency services via the 5GC,

initiate IMS emergency services to the 5GC only, in a case where the cell supports IMS emergency services via the 5GC and the cell does not support IMS emergency services via the EPC, or

initiate IMS emergency services to either the EPC or the 5GC, in a case where the cell supports IMS emergency services via both the EPC and the 5GC, wherein the initiating IMS emergency services to the EPC is performed upon determining, by the UE, that IMS emergency services on the 5GC would fail, wherein the system information block type 1 message:

indicates that the cell supports IMS emergency services via the EPC based on a value of the ims-EmergencySupport information being set to TRUE,

indicates that the cell does not support IMS emergency services via the EPC based on the ims-EmergencySupport information being absent from the system information block type 1 message,

indicates that the cell supports IMS emergency services via the 5GC based on a value of the ims-EmergencySupport5GC information being set to TRUE,

indicates that the cell does not support IMS emergency services via the 5GC based on the ims-EmergencySupport5GC information being absent from the system information block type 1 message, and

indicates that the cell supports IMS emergency services via both the EPC and the 5GC based on the value of the ims-EmergencySupport information being set to TRUE and the value of the ims-EmergencySupport5GC information being set to TRUE.

6. The user equipment according to claim 5 , wherein

the user equipment initiates IMS emergency services to the EPC if the cell supports IMS emergency services via the EPC and if the cell does not support IMS emergency services via the 5GC, or

the user equipment initiates IMS emergency services to the 5GC if the cell supports IMS emergency services via the 5GC and if the cell does not support IMS emergency services via the EPC.

7. The user equipment according to claim 5 , wherein the controller is configured to:

not initiate IMS emergency services to the 5GC, in a case where the cell supports IMS emergency services via the EPC and the cell does not support IMS emergency services via the 5GC, and

not initiate IMS emergency services to the EPC, in a case where the cell supports IMS emergency services via the 5GC and the cell does not support IMS emergency services via the EPC.

8. The user equipment according to claim 5 , wherein

the user equipment initiates IMS emergency services to the EPC upon determining that the IMS emergency services on the 5GC have failed.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 11, 2019
From: TIWARI, KUNDAN; TAMURA, TOSHIYUKI
To: NEC CORPORATION
Reel/Frame 048861/0576 →
Priority Claims (1)
IN 201811011621 · Mar 28, 2018 · national
Continuity (1)
Related Publication 20210029776A1 · Jan 28, 2021