Adhoc group call in wireless communication system

Patent metadata

Field	Value
Publication number	US-12556911-B2
Application number	US-202318324908-A
Country	US
Kind code	B2
Filing date	May 26, 2023
Priority date	May 27, 2022
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method of a first terminal in a wireless communication system is provided. The method comprising: generating an AGK for an adhoc group; transmitting an adhoc group communication request message including a list including IDs of a plurality of second terminals included in the adhoc group and connected to the first server; receiving an adhoc group communication return message signed by the first server; performing an encryption and signing operation on the AGK based on first authentication information related to the first terminal and the second authentication information; transmitting an adhoc group communication security material request message including the AGK that is encrypted and signed; receiving an adhoc group communication response message in response to transmitting the adhoc group communication security material request message; and performing a secure communication.

First claim

What is claimed is:

1 . A method of a first terminal connected to a first server in a wireless communication system, the method comprising:
generating an adhoc group key (AGK) for an adhoc group; transmitting, to the first server, an adhoc group communication request message including a list including identifications (IDs) of a plurality of second terminals included in the adhoc group and connected to the first server; receiving, from the first server, an adhoc group communication return message signed by the first server, wherein the adhoc group communication return message includes second authentication information related to the plurality of second terminals and corresponds to the adhoc group communication request message; performing an encryption and signing operation on the AGK based on first authentication information related to the first terminal and the second authentication information, the first authentication information is pre-stored at the first terminal; transmitting, to the first server, an adhoc group communication security material request message including the AGK that is encrypted and signed; receiving, from the first server, an adhoc group communication response message in response to transmitting the adhoc group communication security material request message; and performing a secure communication with the plurality of second terminals based on the adhoc group communication response message.

2 . The method of claim 1 , wherein the list indicates a first ID of a terminal corresponding to the first authentication information among the plurality of second terminals and a second ID of a terminal not corresponding to the first authentication information among the plurality of second terminals.

3 . The method of claim 1 , wherein the second authentication information includes a certificate of a first key management (KM) server connected to the first server.

4 . The method of claim 1 , wherein the second authentication information includes at least one of a Sakai-Kasahara key encryption (SAKKE) public key and a server ID of a first KM server connected to the first server.

5 . The method of claim 1 , wherein the list includes IDs of a plurality of third terminals included in the adhoc group and connected to a second server.

6 . The method of claim 5 , wherein the list indicates a first ID of a terminal corresponding to the first authentication information among the plurality of third terminals and a second ID of a terminal not corresponding to the first authentication information among the plurality of third terminals.

7 . The method of claim 6 , wherein the adhoc group communication return message includes third authentication information related to the terminal that does not correspond to the first authentication information among the plurality of third terminals.

8 . The method of claim 7 , wherein the third authentication information includes a certificate of a second KM server connected to the second server.

9 . The method of claim 7 , wherein the third authentication information includes at least one of a SAKKE public key or a server ID of a first KM server connected to the second server.

10 . The method of claim 7 , wherein the encryption and signing operation is performed based on the first authentication information, the second authentication information, and the third authentication information,
the secure communication is performed with the plurality of second terminals and the plurality of third terminals.

11 . A method of a first server in a wireless communication system, comprising:
receiving, from a first terminal, an adhoc group communication request message including a list including identifications (IDs) of a plurality of second terminals included in an adhoc group and connected to the first server; transmitting, to a first key management (KM) server, a certificate request message requesting second authentication information related to the plurality of second terminals, wherein the first KM server is connected to the first server based on the adhoc group communication request message; receiving, from the first KM server, a certificate response message including the second authentication information, wherein the certificate response message corresponds to the certificate request message; performing a signature operation on the second authentication information based on the certificate response message; transmitting, to the first terminal, an adhoc group communication return message including the second authentication information that is signed; receiving, from the first terminal, an encrypted and signed AGK in response to receiving the adhoc group communication return message; transmitting, to the plurality of second terminals, an adhoc group communication request message including the encrypted and signed AGK and a first authentication information; receiving, from the plurality of second terminals, an adhoc group communication response message corresponding to the adhoc group communication request message; transmitting, to the first terminal, the adhoc group communication response message; and performing a secure communication with the first terminal and the plurality of second terminals based on the adhoc group communication response message.

12 . The method of claim 11 , wherein the list indicates a first ID of a terminal corresponding to the first authentication information among the plurality of second terminals and a second ID of a terminal not corresponding to the first authentication information among the plurality of second terminals.

13 . The method of claim 11 , wherein the second authentication information includes a certificate of a first KM server connected to the first server.

14 . The method of claim 11 , wherein the second authentication information includes at least one of a Sakai-Kasahara key encryption (SAKKE) public key and a server ID of a first KM server connected to the first server.

15 . The method of claim 11 , wherein the list includes IDs of a plurality of third terminals included in the adhoc group and connected to a second server.

16 . The method of claim 15 , wherein the list indicates a first ID of a terminal corresponding to the first authentication information among the plurality of third terminals and a second ID of a terminal not corresponding to the first authentication information among the plurality of third terminals.

17 . The method of claim 16 , further comprising:
transmitting, to a second KM server, a certificate request message requesting third authentication information related to the plurality of third terminals, the second KM server being connected to the second server based on the adhoc group communication request message; receiving, from the second KM server, a certificate response message including the third authentication information in response to transmitting the certificate request message; and performing an encryption and signing operation on the third authentication information based on the certificate response message, wherein the adhoc group communication return message includes the third authentication information.

18 . The method of claim 17 , wherein the third authentication information includes a certificate of a third KM server connected to the second server.

19 . The method of claim 17 , wherein the third authentication information includes at least one of a SAKKE public key or a server ID of a third KM server connected to the second server.

20 . The method of claim

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Hongjin
• Lee Duckey

Classifications

• H04W76/45

  for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services · CPC title

• H04W4/10

  Push-to-Talk [PTT] or Push-On-Call services · CPC title

• H04W76/12

  Setup of transport tunnels · CPC title

• H04W4/70

  Services for machine-to-machine communication [M2M] or machine type communication [MTC] · CPC title

• H04W92/18

  between terminal devices · CPC title