# US 12,003,549 B2 · Method and terminal for processing security policy for V2X

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- Number: US 12,003,549 B2
- Document ID: US12003549B2
- Status: Granted
- Kind: B2
- Application number: 17/957,155
- Filed: 2022-09-30
- Published: 2023-02-09
- Granted: 2024-06-04
- Earliest claimed: 2020-03-31
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Dongjoo Kim; Sungduck Chun
- Web page: https://patentgrep.com/patent/US12003549B2

## CPC

- H04L 63/20: {for managing network security; network security policies in general (filtering policies H04L63/0227)}
- H04W 12/37: Managing security policies for mobile devices or for controlling mobile applications
- H04L 63/0876: {based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint}
- H04L 63/102: {Entity profiles}
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 12/00: Security arrangements; Authentication; Protecting privacy or anonymity
- H04W 76/14: Direct-mode setup
- H04W 76/20: Manipulation of established connections
- H04W 92/18: between terminal devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for processing a security policy of a device may include a step for receiving, from another device, a first message including first information about a security policy of the other device. The first message may include a direct communication request message or a link modification request message. The method may further include the steps of: determining whether to accept or reject the first message on the basis of both the first information about the security policy of the other device and second information about the security policy of the device; and sending a second message on the basis of the determination.

## Claims

### Claim 1

A security policy handling method performed by a User Equipment (UE), the method comprising:
receiving, from an initiating UE, a first message for a PC5 unicast link between the initiating UE and the UE,
wherein the first message includes a security policy of the initiating UE, and the first message is a direct communication request message or a link modification request message,
determining whether to accept or reject the first message, based on both the security policy of the initiating UE and a security policy of the UE,
wherein the security policy of the initiating UE relates to activating or deactivating a security for the PC5 unicast link, and
wherein whether to accept or reject the first message is determined based on comparing the security policy of the initiating UE and a security policy of the UE; and
transmitting a second message, based on the determination.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the second message is a direct communication reject message or a link modification reject message.

### Claim 3 (depends on 2)

The method of claim 2,
wherein the first message is determined to be rejected, based on (i) that the security policy of the initiating UE is set to a first value and (ii) that the security policy of the UE is set to a second value.

### Claim 4 (depends on 2)

The method of claim 2,
wherein the first message is determined to be rejected, based on that the security policy of the initiating UE is different from the security policy of the UE.

### Claim 5 (depends on 1)

The method of claim 1,
wherein the second message is a direct communication accept message or a link modification accept message.

### Claim 6 (depends on 5)

The method of claim 5,
wherein the first message is determined to be accepted, based on (i) that the security policy of the initiating UE is set to a first value and (ii) that the security policy of the UE is set to the first value.

### Claim 7 (depends on 5)

The method of claim 5,
wherein the first message is determined to be accepted, based on (i) that the security policy of the initiating UE is set to a second value and (ii) that the security policy of the UE is set to the second value.

### Claim 8 (depends on 1)

The method of claim 1,
wherein the link modification request message is received for adding a new vehicle to everything (V2X) service to an PC5 unicast link.

### Claim 9 (depends on 8)

The method of claim 8,
wherein the link modification request message is received based on that security policy of the new V2X service is satisfied in use for the PC5 unicast link.

### Claim 10

A User Equipment (UE) comprising:
at least one processor; and
at least one memory for storing instructions and operably electrically connectable with the at least one processor, wherein the instructions are executed based on execution by the at least one processors, to perform operations include:
receiving, from an initiating UE, a first message for a PC5 unicast link between the initiating UE and the UE,
wherein the first message includes a security policy of the initiating UE, and the first message is a direct communication request message or a link modification request message,
determining whether to accept or reject the first message, based on both the security policy of the initiating UE and a security policy of the UE,
wherein the security policy of the initiating UE relates to activating or deactivating a security for the PC5 unicast link, and
wherein whether to accept or reject the first message is determined based on comparing the security policy of the initiating UE and a security policy of the UE; and
transmitting a second message, based on the determination.

### Claim 11 (depends on 10)

The UE of claim 10,
wherein the second message is a direct communication reject message or a link modification reject message.

### Claim 12 (depends on 11)

The UE of claim 11,
wherein the first message is determined to be rejected, based on (i) that the security policy of the initiating UE is set to a first value and (ii) that the security policy of the UE is set to a second value.

### Claim 13 (depends on 11)

The UE of claim 11,
wherein the first message is determined to be rejected, based on that the security policy of the initiating UE is different from the security policy of the UE.

### Claim 14 (depends on 10)

The UE of claim 10,
wherein the second message is a direct communication accept message or a link modification accept message.

### Claim 15 (depends on 14)

The UE of claim 14,
wherein the first message is determined to be accepted, based on (i) that the security policy of the initiating UE is set to a first value and (ii) that the security policy of the UE is set to the first value.

### Claim 16 (depends on 14)

The UE of claim 14,
wherein the first message is determined to be accepted, based on (i) that the security policy of the initiating UE is set to a second value and (ii) that the security policy of the UE is set to the second value.

### Claim 17

A security policy handling method performed by a initiating User Equipment (UE), the method comprising:
transmitting, to a UE, a first message for a PC5 unicast link between the initiating UE and the UE,
wherein the first message includes a security policy of the initiating UE, and the first message is a direct communication request message or a link modification request message; and
receiving a second message from the UE,
wherein the second message is transmitted by the UE, based on that the UE determines whether to accept or reject the first message, based on both the security policy of the initiating UE and a security policy of the UE, wherein the security policy of the initiating UE relates to activating or deactivating a security for the PC5 unicast link, and
wherein whether to accept or reject the first message is determined based on comparing the security policy of the initiating UE and a security policy of the UE.

### Claim 18 (depends on 17)

The method of claim 17,
wherein the second message is a direct communication reject message or a link modification reject message.

### Claim 19 (depends on 17)

The method of claim 17,
wherein the second message is a direct communication accept message or a link modification accept message.