# US 10,375,571 B2 · Dual connectivity mode of operation of a user equipment in a wireless communication network

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- Number: US 10,375,571 B2
- Document ID: US10375571B2
- Status: Granted
- Kind: B2
- Application number: 16/111,730
- Filed: 2018-08-24
- Published: 2018-12-20
- Granted: 2019-08-06
- Earliest claimed: 2014-01-17
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Mangesh Abhimanyu Ingale; Himke Van Der Velde; Rajavelsamy Rajadurai; Woo-Seong Kim
- Web page: https://patentgrep.com/patent/US10375571B2

## CPC

- H04W 12/041: Key generation or derivation
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 12/122: Counter-measures against attacks; Protection against rogue devices
- H04W 76/15: Setup of multiple wireless link connections
- H04W 80/02: Data link layer protocols
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- 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 system and method provide a security aspect for a UE in dual connectivity mode of operation in wireless communication networks. The system and method provide secure simultaneous transmission and reception in a secure manner between a User Equipment (UE) and one or more eNodeBs (eNBs) configured in an inter-eNB carrier aggregation scenario. The system establishes of a security context between the UE and the Secondary eNB (SeNB) using the RRC signaling between the UE and the Master eNB (MeNB), when a plurality of SCells within SeNB are added simultaneously. The system also detects the intruder in the user data radio bearers, while a UE is operating in dual connectivity mode of operation.

## Claims

### Claim 1

A method for performing a change of a serving cell group (SCG) by a secondary base station in a wireless communication system supporting a dual connectivity of a user equipment, the method comprising:
identifying whether a packet data convergence protocol (PDCP) count is wraparound;
transmitting, to a master base station, a first message for requesting resource modification of the SCG associated with the secondary base station in case that the PDCP count is wraparound; and
receiving, from the master base station, a second message including a refreshed security key associated with the secondary base station,
wherein the first message includes information representing the wraparound of the PDCP count at the secondary base station.

### Claim 2

A secondary base station for performing a change of a serving cell group (SCG) in a wireless communication system supporting a dual connectivity of a user equipment, the secondary base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
identify whether a packet data convergence protocol (PDCP) count is wraparound;
transmit, to a master base station, a first message for requesting resource modification of the SCG associated with the secondary base station in case that the PDCP count is wraparound; and
receive, from the master base station, a second message including a refreshed security key associated with the secondary base station,
wherein the first message includes information representing the wraparound of the PDCP count at the secondary base station.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first message includes information representing a change of primary secondary cell (PScell) or the SCG.

### Claim 4 (depends on 1)

The method of claim 1, wherein the master base station and the secondary base station comprise a medium access control (MAC) entity, a radio link control (RLC) entity, and a PDCP entity that are configured for the SCG, respectively,
wherein the MAC entity handling the SCG is reset and the PDCP entity and the RLC entity are re-established by the resource modification of the SCG.

### Claim 5 (depends on 1)

The method of claim 1, wherein the resource modification of the SCG comprises at least one of addition or release of at least one cell in the SCG.

### Claim 6 (depends on 2)

The secondary base station of claim 2, wherein the first message includes information representing a change of primary secondary cell (PScell) or the SCG.

### Claim 7 (depends on 2)

The secondary base station of claim 2, wherein the master base station and the secondary base station comprise a medium access control (MAC) entity, a radio link control (RLC) entity, and a PDCP entity that are configured for the SCG, respectively,
wherein the MAC entity handling the SCG is reset and the PDCP entity and the RLC entity are re-established by the resource modification of the SCG.

### Claim 8 (depends on 2)

The secondary base station of claim 2, wherein the resource modification of the SCG comprises at least one of addition or release of at least one cell in the SCG.