# US 11,910,246 B2 · Method and device for changing secondary base station in wireless mobile communication system

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- Number: US 11,910,246 B2
- Document ID: US11910246B2
- Status: Granted
- Kind: B2
- Application number: 18/238,542
- Filed: 2023-08-28
- Published: 2023-12-28
- Granted: 2024-02-20
- Earliest claimed: 2021-08-05
- Assignees: Blackpin Inc.; Soenghun Kim
- Applicants: BLACKPIN Inc.; Soenghun Kim
- Inventors: Soenghun Kim
- Web page: https://patentgrep.com/patent/US11910246B2

## CPC

- H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions}
- H04W 36/00835: {Determination of neighbour cell lists}
- H04W 36/362: {Conditional handover}
- H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method and apparatus for secondary base station change in a mobile communication system are provided. Method for secondary node change includes receiving conditional reconfiguration information from the base station, transmitting to the base station a first response message with a transaction identifier, performing evaluation based on the configuration generated by a second base station and transmitting a second response message with an identifier indicating which conditional reconfiguration is executed.

## Claims

### Claim 1

A method performed by a master node (MN), the method comprising:
transmitting, to a first Secondary Node (SN), a first base station control message, wherein the first base station control message includes first information in response to a preparation procedure for a first reconfiguration procedure being performed;
receiving, from the first SN, a second base station control message, wherein the second base station control message includes second information, and wherein the second information includes a cell global identifier of a specific cell for the first reconfiguration procedure;
transmitting, to a terminal, a first Long Term Evolution (LTE) downlink (DL) message, wherein the first LTE DL message includes a first identifier and one or more CondReconfigToAddMod, and wherein each of the one or more CondReconfigToAddMod includes an execution condition, a second identifier, and a New Radio (NR) DL message;
receiving, from the terminal, a first LTE uplink (UL) message, wherein the first LTE UL message includes the first identifier, and wherein the first identifier corresponds to the first LTE DL message;
receiving, from the terminal, a second LTE UL message, wherein the second LTE UL message includes a second identifier, and wherein the second identifier corresponds to the NR DL message;
transmitting, to a second SN, a third base station control message, wherein the third base station control message includes tunnel information for data forwarding; and
transmitting, to the first SN, a fourth base station control message, wherein the fourth base station message includes a NR UL message received from the terminal.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the first reconfiguration procedure is a conditional PSCell change.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the first information includes information related to one or more candidate special cells.

### Claim 4 (depends on 1)

The method of claim 1,
wherein the third base station control message is SGNB RELEASE REQUEST message.

### Claim 5

A master node (MN) in a wireless communication system, the MN comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to control the transceiver to:
transmit, to a first Secondary Node (SN), a first base station control message, wherein the first base station control message includes first information in response to a preparation procedure for a first reconfiguration procedure being performed;
receive, from the first SN, a second base station control message, wherein the second base station control message includes second information, and wherein the second information includes a cell global identifier of a specific cell for the first reconfiguration procedure;
transmit, to a terminal, a first Long Term Evolution (LTE) downlink (DL) message, wherein the first LTE DL message includes a first identifier and one or more CondReconfigToAddMod, and wherein each of the one or more CondReconfigToAddMod includes an execution condition, a second identifier, and a New Radio (NR) DL message;
receive, from the terminal, a first LTE uplink (UL) message, wherein the first LTE UL message includes the first identifier, and wherein the first identifier corresponds to the first LTE DL message;
receive, from the terminal, a second LTE UL message, wherein the second LTE UL message includes the second identifier, and wherein the second identifier corresponds to the NR DL message;
transmit, to a second SN, a third base station control message, wherein the third base station control message includes tunnel information for data forwarding; and
transmit, to the first SN, a fourth base station control message, wherein the fourth base station message includes a NR UL message received from the terminal.