# US 2018/0324883 A1 · Device and Method of Handling a Dual Connectivity

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- Number: US 2018/0324883 A1
- Document ID: US20180324883A1
- Status: Published application
- Kind: A1
- Application number: 15/970,860
- Filed: 2018-05-03
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: HTC Corporation
- Applicants: HTC Corporation
- Inventors: Chih-Hsiang Wu
- Web page: https://patentgrep.com/patent/US20180324883A1

## CPC

- H04W 76/15: Setup of multiple wireless link connections
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/08: Access point devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A first base station (BS) of a first network for handling a dual connectivity (DC) comprises a storage device and a processing circuit, coupled to the storage device. The storage device stores, and the processing circuit is configured to execute instructions of: transmitting a Secondary Node (SN) Request message comprising a protocol data unit (PDU) Session identity of a communication device, to a second BS of a second network; receiving a SN Request Acknowledge message comprising a first radio resource control (RRC) message, from the second BS, in response to the SN Request message; and transmitting the first RRC message to the communication device, wherein the first RRC message configures a data radio bearer (DRB), a DRB identity and the PDU Session identity of the communication device to communicate with the second BS.

## Claims

### Claim 1

A first base station (BS) of a first network for handling a dual connectivity (DC), comprising:
a storage device; and
a processing circuit, coupled to the storage device, wherein the storage device stores, and the processing circuit is configured to execute instructions of:
transmitting a Secondary Node (SN) Request message comprising a protocol data unit (PDU) Session identity of a communication device, to a second BS of a second network;
receiving a SN Request Acknowledge message comprising a first radio resource control (RRC) message, from the second BS, in response to the SN Request message; and
transmitting the first RRC message to the communication device, wherein the first RRC message configures a data radio bearer (DRB), a DRB identity and the PDU Session identity of the communication device to communicate with the second BS.

### Claim 2 (depends on 1)

The first BS of claim 1, wherein the DRB identity is comprised in the SN Request message.

### Claim 3 (depends on 1)

The first BS of claim 1, wherein the first BS is a master BS (MBS) of the communication device, and the second BS is a secondary BS (SBS) of the communication device.

### Claim 4 (depends on 1)

The first BS of claim 1, wherein the first RRC message is a new radio (NR) RRC message.

### Claim 5 (depends on 1)

The first BS of claim 1, wherein the first BS transmits the first RRC message by transmitting a second RRC message comprising the first RRC message, and the instructions further comprise:
receiving a second RRC response message responding the second RRC message, from the communication device.

### Claim 6 (depends on 5)

The first BS of claim 5, wherein the second RRC message is a LTE RRC Connection Reconfiguration message, and the second RRC response message is a LTE RRC Connection Reconfiguration Complete message.

### Claim 7

A second base station (BS) of a second network for handling a dual connectivity (DC), comprising:
a storage device; and
a processing circuit, coupled to the storage device, wherein the storage device stores, and the processing circuit is configured to execute instructions of:
receiving a Secondary Node (SN) Request message comprising a protocol data unit (PDU) Session identity for a communication device, from a first BS of a first network;
determining the PDU Session identity for the communication device according to the SN Request message; and
transmitting a SN Request Acknowledge message comprising a radio resource control (RRC) message, to the first BS, in response to the SN Request message, wherein the RRC message configures a data radio bearer (DRB), a DRB identity and the PDU Session identity for the communication device to communicate with the second BS.

### Claim 8 (depends on 7)

The second BS of claim 7, wherein the instructions further comprise:
generating the RRC message and comprising the PDU Session identity in the RRC message, when receiving the SN Request message.

### Claim 9 (depends on 7)

The second BS of claim 7, wherein the DRB identity is comprised in the SN Request message.

### Claim 10 (depends on 7)

The second BS of claim 7, wherein the DRB identity is determined by the second BS.

### Claim 11 (depends on 7)

The second BS of claim 7, wherein the RRC message is a new radio (NR) RRC message.