# US 2026/0095877 A1 · Methods and apparatus for denial of service (dos) attack remediation in non-terrestrial networks (ntn)

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- Number: US 2026/0095877 A1
- Document ID: US20260095877A1
- Status: Published application
- Kind: A1
- Application number: 18/903,938
- Filed: 2024-10-01
- Published: 2026-04-02
- Earliest claimed: 2024-10-01
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: InterDigital Patent Holdings, Inc.
- Inventors: Alec BRUSILOVSKY; Michael STARSINIC; Michel ROY; Anuj SETHI; Zhibi WANG; Jung Je SON; Guanzhou WANG; Samir FERDI
- Web page: https://patentgrep.com/patent/US20260095877A1

## CPC

- H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04L 9/0643: {Hash functions, e.g. MD5, SHA, HMAC or f9 MAC}
- H04W 12/06: Authentication
- H04W 12/069: using certificates or pre-shared keys
- H04L 63/0876: {based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint}
- H04L 63/1458: {Denial of Service}
- H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A wireless transmit and receive unit (WTRU) may be provisioned with a shared key and a WTRU identity. The WTRU may receive, from a network equipment on board the satellite, broadcasted parameters of a puzzle. The WTRU may generate evidence based on solving the puzzle and injecting the shared secret key into the evidence. The WTRU may send, to the network equipment on board the satellite, a registration request message. The registration request message may include the generated evidence and the WTRU identity. The WTRU may receive, from the network equipment on board the satellite, a registration accept responsive to the registration request.

## Claims

### Claim 1

A method performed by a wireless transmit and receive unit (WTRU) provisioned with a shared secret key, the method comprising:
receiving, from a network, broadcasted one or more parameters of a puzzle;
generating evidence based on solving the puzzle and injecting the shared secret key into the evidence while solving the puzzle;
sending, to the network, a registration request, wherein the registration request includes the generated evidence and a WTRU identity; and
receiving, from the network, a registration accept responsive to the registration request.

### Claim 2 (depends on 1)

The method of claim 1, wherein the WTRU is further provisioned with the WTRU identity.

### Claim 3 (depends on 1)

The method of claim 1, wherein the WTRU is further provisioned with a plurality of puzzles, wherein each puzzle comprises one or more parameters of the puzzle, and the one or more parameters of the puzzle include a puzzle index.

### Claim 4 (depends on 1)

The method of claim 1, wherein the broadcasted one or more parameters of a puzzle include a puzzle index.

### Claim 5 (depends on 1)

The method of claim 1, wherein the registration request further comprises the broadcasted one or more parameters of a puzzle.

### Claim 6 (depends on 1)

The method of claim 1, wherein the network is a non-terrestrial network (NTN).

### Claim 7 (depends on 1)

The method of claim 1, wherein the broadcasted one or more parameters of a puzzle are received from network equipment on board a satellite.

### Claim 8 (depends on 7)

The method of claim 7, wherein the network equipment on board a satellite comprises an eNB or a gNB.

### Claim 9 (depends on 7)

The method of claim 7, wherein the network equipment on board a satellite comprises a mobility management entity (MME) or an access and mobility management function (AMF).

### Claim 10

A wireless transmit and receive unit (WTRU), the WTRU provisioned with a shared secret key, the WTRU comprising:
at least one transceiver and at least one processor, wherein:
the at least one transceiver and at least one processor are configured to receive, from a network, broadcasted one or more parameters of a puzzle;
the at least one transceiver and at least one processor are configured to generate evidence based on solving the puzzle and injecting the shared secret key into the evidence while solving the puzzle;
the at least one transceiver and at least one processor are configured to send, to the network, a registration request, wherein the registration request includes the generated evidence and a WTRU identity; and
the at least one transceiver and at least one processor are configured to receive, from the network, a registration accept responsive to the registration request.

### Claim 11 (depends on 10)

The WTRU of claim 10, wherein the WTRU is further provisioned with the WTRU identity.

### Claim 12 (depends on 10)

The WTRU of claim 10, wherein the WTRU is further provisioned with a plurality of puzzles, wherein each puzzle comprises one or more parameters of the puzzle, and the one or more parameters of the puzzle include a puzzle index.

### Claim 13 (depends on 10)

The WTRU of claim 10, wherein the broadcasted one or more parameters of a puzzle include a puzzle index.

### Claim 14 (depends on 10)

The WTRU of claim 10, wherein the registration request further comprises the broadcasted one or more parameters of a puzzle.

### Claim 15 (depends on 10)

The WTRU of claim 10, wherein the network is a non-terrestrial network (NTN).

### Claim 16 (depends on 10)

The WTRU of claim 10, wherein the broadcasted one or more parameters of a puzzle are received from network equipment on board a satellite.

### Claim 17 (depends on 16)

The WTRU of claim 16, wherein the network equipment on board a satellite comprises an eNB or a gNB.

### Claim 18 (depends on 16)

The WTRU of claim 16, wherein the network equipment on board a satellite comprises a mobility management entity (MME) or an access and mobility management function (AMF).