IP Library › Granted Patent US 12707257
Granted Patent B2
US 12707257 · App. 18/501,215 · Granted Aug 11, 2026

Method and device for managing security domain access information of migrated users

Inventors: Kiran Gurudev Kapale (Bangalore, IN); Arunprasath Ramamoorthy (Bangalore, IN); Hongjin Choi (Gyeonggi-do, KR)
Assignee: Samsung Electronics Co., Ltd
H04W12/04H04L63/20H04W12/08H04W12/086H04W8/12
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Quick Facts
Patent No.
US 12707257
App. No.
18/501,215
Granted
Aug 11, 2026
Kind
B2
Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method and a first mission critical (MC) server are provided for managing security domain access information of migrated users in a private communication in MC services. A first MC server receives a private call request from an MC service user of a first UE for establishing the private communication with an MC service user of a second UE. It is determined whether the MC service user of the second UE is migrated from the first MC server to at least one secondary MC server. A private call redirection message is generated, and the private call redirection message is transmitted to the MC service user of the first UE to establish the private communication with the MC service user of the second UE based on the private call redirection message.

Claims (42)

1 . A method performed by a first server in a wireless communication system, the method comprising:

receiving, from a first client, a private call request for establishing a private communication with a second client;

determining whether the second client is migrated from the first server to a second server with a new service identifier (ID) assigned by the second server; and

in case that the second client is migrated from the first server to the second server, transmitting, to the first client, a private call redirection message including information indicating that the second client is migrated to the second server and information on a new service identifier of the second client,

wherein the private call redirection message includes security domain access information including a key management server (KMS) uniform resource identifier (URI) associated with the new service ID of the second client.

2 . The method of claim 1 , wherein the KMS URI allows the first client to download required security domain parameters and key materials to establish an end-to-end security connection during private communication.

3 . The method of claim 1 ,

wherein the first client and the second client are mission critical clients, and

wherein the first server and the second server are mission critical servers.

4 . The method performed by a first client in a wireless communication system, the method comprising:

transmitting, to a first server, a private call request for establishing the private communication with a second client;

receiving, from the first server, a private call redirection message, wherein the private call redirection message includes information that the second client is migrated to the second server and a new service identifier (ID) of the second client; and

establishing the private communication with the second client based on the private call redirection message,

wherein the private call redirection message includes security domain access information including a key management server (KMS) uniform resource identifier (URI) associated with the new service ID of the second client.

5 . The method of claim 4 , wherein the KMS URI allows the first client to download required security domain parameters and key materials to establish an end-to-end security connection during private communication.

6 . The method of claim 4 ,

wherein the first client and the second client are mission critical clients, and

wherein the first server and the second server are mission critical servers.

7 . A first server comprising:

at least one transceiver;

at least one hardware processor communicatively coupled to the at least one transceiver; and

at least one memory, communicatively coupled to the at least one hardware processor, storing instructions executable by the at least one processor individually or in any combination to cause the first server to:

receive, from a first client, a private call request for establishing the private communication with a second client;

determine whether the second client is migrated from the first server to a second server with a new service identifier (ID) assigned by the second server; and

in case that the second client is migrated from the first server to the second server, transmit, to the first client, a private call redirection message including information indicating that the second client is migrated to the second server and information on a new service ID of the second client,

wherein the private call redirection message includes security domain access information including a key management server (KMS) uniform resource identifier (URI) associated with the new service ID of the second client.

8 . The first server of claim 7 , wherein the KMS URI allows the first client to download required security domain parameters and key materials to establish an end-to-end security connection during private communication.

9 . The first server of claim 7 ,

wherein the first client and the second client are mission critical clients, and

wherein the first server and the second server are mission critical servers.

10 . A first client comprising:

at least one transceiver;

at least one hardware processor communicatively coupled to the at least one transceiver; and

at least one memory, communicatively coupled to the at least one hardware processor, storing instructions executable by the at least one processor individually or in any combination to cause the first client to:

transmit, to a first server, a private call request for establishing the private communication with a second client;

receive, from the first server, a private call redirection message, wherein the private call redirection message includes information that the second client is migrated to the second server and a new service identifier (ID) of the second client; and

establish the private communication with the second client based on the private call redirection message,

wherein the private call redirection message includes security domain access information including a key management server (KMS) uniform resource identifier (URI) associated with the new service ID of the second client.

11 . The first client of claim 10 , wherein the KMS URI allows the first client to download required security domain parameters and key materials to establish an end-to-end security connection during private communication.

12 . The first client of claim 10 ,

wherein the first client and the second client are mission critical clients, and

wherein the first server and the second server are mission critical servers.