# US 2014/0192631 A1 · Method for detecting security error in mobile telecommunications system and device of mobile telecommunications

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- Number: US 2014/0192631 A1
- Document ID: US20140192631A1
- Status: Published application
- Kind: A1
- Application number: 14/203,287
- Filed: 2014-03-10
- Published: 2014-07-10
- Earliest claimed: 2007-08-10
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seung June YI; Sung Jun PARK; Young Dae LEE; Sung Duck CHUN
- Web page: https://patentgrep.com/patent/US20140192631A1

## CPC

- H04L 1/0061: {Error detection codes}
- G06F 11/1004: {to protect a block of data words, e.g. CRC or checksum (G06F11/1076 takes precedence; security arrangements for protecting computers or computer systems against unauthorized activity G06F21/00)}
- H04L 45/28: using route fault recovery
- H04L 49/552: by ensuring the integrity of packets received through redundant connections
- H04L 49/555: {Error detection}
- H04L 63/123: {received data contents, e.g. message integrity}
- H04L 69/22: Parsing or analysis of headers
- H04W 12/033: of the user plane, e.g. user's traffic
- H04W 12/037: of the control plane, e.g. signalling traffic
- H04W 12/06: Authentication
- H04W 12/106: Packet or message integrity
- H04W 76/18: Management of setup rejection or failure
- H04W 76/19: Connection re-establishment
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

According to one embodiment, a method of performing a re-establishment procedure in a mobile communication system includes: receiving at least one packet data convergence protocol (PDCP) control plane data unit; performing an integrity check on the at least one PDCP control plane data unit; identifying an integrity check failure with regard to the at least one PDCP control plane data unit; and performing a re-establishment procedure if the integrity check failure is identified to exist with regard to the at least one PDCP control plane data unit.

## Claims

### Claim 1

A method of performing a re-establishment procedure in a mobile communication system, the method comprising:
receiving at least one packet data convergence protocol (PDCP) control plane data unit;
performing an integrity check on the at least one PDCP control plane data unit;
identifying an integrity check failure with regard to the at least one PDCP control plane data unit; and
performing a re-establishment procedure if the integrity check failure is identified to exist with regard to the at least one PDCP control plane data unit.

### Claim 2 (depends on 1)

The method of claim 1, wherein the re-establishment procedure comprises at least re-establishing a radio bearer (RB) or re-establishing a radio resource control (RRC) connection.

### Claim 3 (depends on 1)

The method of claim 1, wherein performing the integrity check on the at least one PDCP control plane data unit comprises:
counting a number of integrity-failed PDCP control plane data units among the at least one PDCP control plane data unit received; and
comparing the number of integrity-failed PDCP control plane data units counted to a reference value,
wherein the integrity check failure is identified if the number of integrity-failed PDCP control plane data units counted reaches the reference value.

### Claim 4 (depends on 3)

The method of claim 3, wherein the integrity-failed PDCP control plane data units are in a consecutive order.

### Claim 5 (depends on 1)

The method of claim 1, wherein the integrity check failure is identified if a message authentication code-integrity (MAC-I) value of the at least one PDCP control plane data unit received is different from an expected message authentication code-integrity (XMAC-I) value.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
deciphering the at least one PDCP control plane data unit received.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
removing at least one PDCP header from the at least one PDCP control plane data unit received.