# US 11,310,320 B2 · Enhanced procedure transaction ID (PTI) error handling

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- Number: US 11,310,320 B2
- Document ID: US11310320B2
- Status: Granted
- Kind: B2
- Application number: 16/835,442
- Filed: 2020-03-31
- Published: 2020-10-01
- Granted: 2022-04-19
- Earliest claimed: 2019-04-01
- Assignees: Mediatek Inc.
- Applicants: Mediatek Inc.
- Inventors: Chien-Chun Huang-Fu; Yu-Chieh Tien
- Web page: https://patentgrep.com/patent/US11310320B2

## CPC

- H04L 67/14: Session management (for real-time applications in data packet communications networks H04L65/1066)
- H04L 67/141: Setup of application sessions (admission control or resource allocation in data switching networks H04L47/70)
- H04L 67/143: Termination or inactivation of sessions, e.g. event-controlled end of session
- H04L 67/147: Signalling methods or messages providing extensions to protocols defined by standardisation
- H04L 69/322: Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04W 12/06: Authentication
- H04W 76/10: Connection setup
- H04W 76/19: Connection re-establishment
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/22: Manipulation of transport tunnels
- 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 Procedure Transaction Identity (PTI) error handling on 5G Session Management (5GSM) procedures is proposed. If a User Equipment (UE) receives a PDU SESSION AUTHENTICATION COMMAND or PDU SESSION AUTHENTICATION RESULT message in which the PTI value is an assigned value, the UE transmits a 5GSM STATUS message including 5GSM cause #81 “invalid PTI value”. If the UE receives a PDU SESSION ESTABLISHMENT ACCEPT or REJECT message, a PDU SESSION MODIFICATION COMMAND or REJECT message, or a PDU SESSION RELEASE COMMAND or REJECT message in which the PTI value is an unassigned value, the UE ignores the received message. If the UE receives any 5GSM message in which the PTI value is a reserved value, the UE ignores the received 5GSM message.

## Claims

### Claim 1

A method, comprising:
receiving a 5G Session Management (5GSM) message by a device in a mobile communication network, wherein the 5GSM message is associated with a Protocol Data Unit (PDU) session and comprises a Procedure Transaction Identity (PTI) value;
determining whether a PTI error has occurred with the PTI value; and
transmitting a 5GSM STATUS message comprising a 5GSM cause or ignoring the 5GSM message in response to a determined PTI error occurred with the PTI value, wherein the 5GSM STATUS message is transmitted in response to that the 5GSM message is a PDU SESSION AUTHENTICATION COMMAND message or a PDU SESSION AUTHENTICATION RESULT message, the PTI error comprises that the PTI value is an assigned value, and the 5GSM cause comprises cause #81 indicating that the PTI value is invalid.

### Claim 2 (depends on 1)

The method of claim 1, wherein the cause #81 indicates that the PTI value is invalid for the 5GSM message.

### Claim 3

A method, comprising:
receiving a 5G Session Management (5GSM) message by a device in a mobile communication network, wherein the 5GSM message is associated with a Protocol Data Unit (PDU) session and comprises a Procedure Transaction Identity (PTI) value;
determining whether a PTI error has occurred with the PTI value; and
transmitting a 5GSM STATUS message comprising a 5GSM cause or ignoring the 5GSM message in response to a determined PTI error occurred with the PTI value, wherein the 5GSM STATUS message is transmitted or the 5GSM message is ignored in response to that the 5GSM message is a PDU SESSION ESTABLISHMENT ACCEPT message, a PDU SESSION ESTABLISHMENT REJECT message, a PDU SESSION MODIFICATION REJECT message, or a PDU SESSION RELEASE REJECT message, the PTI error comprises that the PTI value is an unassigned value, and the 5GSM cause comprises cause #81 indicating that the PTI value is invalid.

### Claim 4 (depends on 1)

The method of claim 1, wherein the 5GSM message is ignored in response to the PTI error comprising that the PTI value is a reserved value.

### Claim 5

A User Equipment (UE), comprising:
a receiver that receives a 5G Session Management (5GSM) message from a network entity in a mobile communication network, wherein the 5GSM message is associated with a Protocol Data Unit (PDU) session and comprises a Procedure Transaction Identity (PTI) value;
a PTI handling circuit that determines whether a PTI error has occurred with the PTI value; and
a transmitter that transmits a 5GSM STATUS message comprising a 5GSM cause to the network entity or ignores the 5GSM message in response to a determined PTI error occurred with the PTI value, wherein the 5GSM STATUS message is transmitted in response to that the 5GSM message is a PDU SESSION AUTHENTICATION COMMAND message or a PDU SESSION AUTHENTICATION RESULT message, the PTI error comprises that the PTI value is an assigned value, and the 5GSM cause comprises cause #81 indicating that the PTI value is invalid.

### Claim 6 (depends on 5)

The UE of claim 5, wherein the cause #81 indicates that the PTI value is invalid for the 5GSM message.

### Claim 7

A User Equipment (UE), comprising:
a receiver that receives a 5G Session Management (5GSM) message from a network entity in a mobile communication network, wherein the 5GSM message is associated with a Protocol Data Unit (PDU) session and comprises a Procedure Transaction Identity (PTI) value;
a PTI handling circuit that determines whether a PTI error has occurred with the PTI value; and
a transmitter that transmits a 5GSM STATUS message comprising a 5GSM cause to the network entity or ignores the 5GSM message in response to a determined PTI error occurred with the PTI value, wherein the 5GSM STATUS message is transmitted or the 5GSM message is ignored in response to that the 5GSM message is a PDU SESSION ESTABLISHMENT ACCEPT message, a PDU SESSION ESTABLISHMENT REJECT message, a PDU SESSION MODIFICATION REJECT message, or a PDU SESSION RELEASE REJECT message, the PTI error comprises that the PTI value is an unassigned value, and the 5GSM cause comprises cause #81 indicating that the PTI value is invalid.

### Claim 8 (depends on 5)

The UE of claim 5, wherein the 5GSM message is ignored in response to the PTI error comprising that the PTI value is a reserved value.

### Claim 9

A network entity, comprising:
a receiver that receives a 5G Session Management (5GSM) message from a User Equipment (UE) in a mobile communication network, wherein the 5GSM message is associated with a Protocol Data Unit (PDU) session and comprises a Procedure Transaction Identity (PTI) value;
a PTI handling circuit that determines whether a PTI error has occurred with the PTI value; and
a transceiver that transmits a 5GSM STATUS message comprising a 5GSM cause to the UE or ignores the 5GSM message in response to a determined PTI error occurred with the PTI value, wherein the 5GSM message is ignored in response to the PTI error comprising that the PTI value is a reserved value.