Granted Patent B2

US 12,628,058 · App. 18/215,216 · Granted May 12, 2026

Inventor: Yang Lu (Beijing, CN)

Assignee: 1FINITY Inc.

H04W36/08H04W36/305

Abstract

Claims (76)

1 . A group migrating apparatus, configured in a second donor device, wherein the apparatus comprises:

processor circuitry configured to, when an IAB-node moves from a first donor device to the second donor device, perform at least one of the following processing:

enabling the IAB-node to update a first TNL address used for a first F1-C connection to a second TNL address;

enabling the IAB-node to update a third TNL address used for a second F1-C connection to a fourth TNL address;

configuring the IAB-node with a fourth TNL address used for setting up a second F1-C connection;

adding for the IAB-node a second TNL address used for a first F1-C connection;

configuring the IAB-node with a third TNL address used for setting up a second F1-C connection; and

adding for the IAB-node a fourth TNL address used for a second F1-C connection;

wherein the first F1-C connection is F1 connection between a DU of the IAB-node and a CU of the first donor device, the second F1-C connection is F1 connection between the DU of the IAB-node and a CU of the second donor device, the first TNL address and the third TNL address are TNL addresses routable to the DU of the first donor device, and the second TNL address and the fourth TNL address are TNL addresses routable to the DU of the second donor device;

wherein that the IAB-node moves from the first donor device to the second donor device refers to one of the following:

that the IAB-node is connection reestablished to the second donor device when a radio link failure occurs in a backhaul link of the IAB-node under the first donor device;

that the IAB-node is handed over from the first donor device to the second donor device; and

that the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device;

wherein in a case where the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device, the receiver receives a first RRC reconfiguration message; and

wherein the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and the second TNL address used for the first F1-C connection, and the IAB-node adds the second TNL address for the first F1-C connection.

2 . The apparatus according to claim 1 , wherein when the radio link failure occurs in the backhaul link of the IAB-node under the first donor device, the processor circuitry performs the following processing:

enabling the IAB-node to update the first TNL address used for the first F1-C connection to the second TNL address; and

configuring the IAB-node with the fourth TNL address used for setting up the second F1-C connection.

3 . The apparatus according to claim 1 , wherein,

after the IAB-node is connection reestablished to the second donor device, the processor circuitry transmits a first RRC reconfiguration message to the IAB-node, the first RRC reconfiguration message containing the second TNL address used for the first F1-C connection, or the first RRC reconfiguration message containing the second TNL address used for the first F1-C connection and the fourth TNL address used for the second F1-C connection.

4 . The apparatus according to claim 3 , wherein after the second F1-C connection is setup between the second donor device and the IAB-node, the processor circuitry transmits a first message to the DU of the IAB-node at the CU of the second donor device via the second F1-C connection by using the fourth TNL address, so that the IAB-node sets up a second context for its served UE;

wherein the first message includes a first context identifier of the UE, so that the IAB-node obtains a first context of the UE according to the first context identifier and sets up the second context by reusing the first context.

5 . A group migrating apparatus, configured in a IAB-node, the IAB-node moving from a first donor device to a second donor device, wherein the apparatus comprises:

a receiver configured to receive, from the first donor device, a first message, the first message including at least one of the following:

a second TNL address used for a first F1-C connection, so as to update a first TNL address used for the first F1-C connection to the second TNL address, or to add the second TNL address for the first F1-C connection;

a fourth TNL address used for the second F1-C connection, so as to update a third TNL address used for the second F1-C connection to the fourth TNL address, or to set up the second F1-C connection with a CU of the second donor device by using the fourth TNL address, or to add the fourth TNL address for the second F1-C connection; and

a third TNL address used for the second F1-C connection, so as to add the third TNL address for the second F1-C connection, or to set up the second F1-C connection with the CU of the second donor device by using the third TNL address;

wherein the first F1-C connection is F1 connection between a DU of the IAB-node and a CU of the first donor device, the second F1-C connection is F1 connection between the DU of the IAB-node and the CU of the second donor device, the first TNL address and the third TNL address are TNL addresses routable to the first donor device, and the second TNL address and the fourth TNL address are TNL addresses routable to the second donor device;

wherein the apparatus further comprises: first setting processor circuitry and second setting processor circuitry,

the first setting processor circuitry setting up the second F1-C connection with the second donor device, the receiver receiving a second message transmitted by the CU of the second donor device via the second F1-C connection by using the fourth TNL address, and the second setting processor circuitry setting up a second context for a UE served by the IAB-node according to the second message; and

wherein the second message includes a first context identifier of the UE, and the IAB-node obtains a first context of the UE according to the first context identifier and sets up the second context by reusing the first context.

6 . The apparatus according to claim 5 , wherein that the IAB-node moves from the first donor device to the second donor device refers to one of the following:

that the IAB-node is connection reestablished to the second donor device when a radio link failure occurs in a backhaul link of the IAB-node under the first donor device;

that the IAB-node is handed over from the first donor device to the second donor device; and

that the IAB-node maintains connection with the first donor device and adds an interface connection with the second donor device.

7 . The apparatus according to claim 6 , wherein the apparatus further comprises processor circuitry,

after the IAB-node is connection reestablished to the second donor device, the receiver receives the first message;

and the first message includes the second TNL address used for the first F1-C connection, and the processor circuitry updates the first TNL address used for the first F1-C connection to the second TNL address;

or, the first message includes the second TNL address used for the first F1-C connection and a fourth TNL address used for the second F1-C connection, and the processor circuitry updates the first TNL address used for the F1-C connection to the second TNL address and sets up the second F1-C connection with the CU of the second donor device by using the fourth TNL address.

8 . The apparatus according to claim 6 , wherein the apparatus further comprises: first setting processor circuitry and processor circuitry,

and in a case where the IAB-node is handed over from the first donor device to the second donor device, the receiver receives the first message;

the first message includes a handover command and the fourth TNL address used for the second F1-C connection, and the first setting processor circuitry sets up the second F1-C connection with the CU of the second donor device by using the fourth TNL address;

or, the first message includes a handover command and the second TNL address used for the first F1-C connection, and the processor circuitry updates the first TNL address used for the first F1-C connection to the second TNL address.

9 . The apparatus according to claim 7 , wherein the first message further includes at least one of the following:

a BAP address allocated to the IAB-node;

backhaul RLC channel configuration of the IAB-node, and a default BAP routing identifier and default backhaul RLC channel identifier used for F1-C traffic and non-F1 traffic;

a sixth TNL address used by the IAB-node to update a fifth TNL address used for its F1-U connection to the sixth TNL address; and

a BAP routing identifier and a backhaul RLC channel identifier used for F1-U connection;

wherein the fifth TNL address is a TNL address routable to a DU of the first donor device, and the sixth TNL address is a TNL address routable to a DU of the second donor device.

10 . The apparatus according to claim 7 , wherein the apparatus further comprises processor circuitry,

and in a case where the IAB-node is handed over from the first donor device to the second donor device, the receiver receives the first message, the first message including a handover command and the fourth TNL address used for the second F1-C connection, and the processor circuitry updates the third TNL address used for the second F1-C connection to the fourth TNL address.

11 . The apparatus according to claim 7 , wherein in a case where the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device, the receiver receives the first message;

wherein the first message includes secondary cell group (SCG) configuration information and a fourth TNL address or a third TNL address used for the second F1-C connection, and the apparatus further comprises first setting processor circuitry, the first setting processor circuitry setting up the second F1-C connection with the CU of the second donor device by using the fourth TNL address or the third TNL address;

or, the first message includes secondary cell group (SCG) configuration information and the second TNL address used for the first F1-C connection, and the apparatus further comprises processor circuitry, the processor circuitry adding the second TNL address for the first F1-C connection.

12 . The apparatus according to claim 11 , wherein if the first message does not include the fourth TNL address used for the second F1-C connection, after the processor circuitry adds the air interface connection with the second donor device,

the receiver receives a third message transmitted by the second donor device, wherein the third message includes the fourth TNL address used for the second F1-C connection;

and the first setting processor circuitry sets up the second F1-C connection with the CU of the second donor device by using the fourth TNL address.

13 . The apparatus according to claim 7 , wherein in a case where the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device, the receiver receives the first message;

wherein the first message includes secondary cell group (SCG) configuration information and a fourth TNL address used for the second F1-C connection, and the apparatus further comprises processor circuitry, the processor circuitry adding the fourth TNL address for the second F1-C connection;

or, the first message includes secondary cell group (SCG) configuration information, the fourth TNL address used for the second F1-C connection and the second TNL address used for the first F1-C connection, and the apparatus further comprises processor circuitry, the processor circuitry adding the fourth TNL address for the second F1-C connection and adding the second TNL address for the first F1-C connection.

14 . The apparatus according to claim 5 , wherein the apparatus further comprises a transmitter,

the receiver receives a RRC reconfiguration message for a UE served by the IAB-node forwarded by the first donor device via the first F1-C connection by using the second TNL address or by using the first TNL address, and the transmitter transmits the RRC reconfiguration message to the UE served by the IAB-node;

and the receiver receives a RRC reconfiguration complete message transmitted by the UE served by the IAB-node, and the transmitter transmits the RRC reconfiguration complete message to the second donor device via the second F1-C connection by using the fourth TNL address.

15 . The apparatus according to claim 5 , wherein the apparatus further comprises a transmitter,

the receiver receives a RRC reconfiguration message for the UE served by the IAB-node forwarded by the first donor device via the first F1-C connection by using the first TNL address, and the transmitter transmits the RRC reconfiguration message to the UE served by the IAB-node;

and the receiver receives a RRC reconfiguration complete message transmitted by the UE served by the IAB-node, and the transmitter transmits the RRC reconfiguration complete message to the second donor device via the second F1-C connection by using the third TNL address or the fourth TNL address.

16 . A group migrating apparatus, configured in a first donor device, an IAB-node moving from the first donor device to a second donor device, wherein the apparatus comprises:

a receiver configured to receive a second TNL address used for a first F1-C connection of the IAB-node transmitted by the second donor device; and

processor circuitry configured to update a first TNL address used for the first F1-C connection of the IAB-node to the second TNL address, or add the second TNL address for the first F1-C connection of the IAB-node;

wherein the first F1-C connection is F1 connection between a DU of the IAB-node and a CU of the first donor device, the first TNL address is a TNL address routable to the DU of the first donor device, and the second TNL address is a TNL address routable to the DU of the second donor device;

wherein that the IAB-node moves from the first donor device to the second donor device refers to one of the following:

that the IAB-node is connection reestablished to the second donor device when a radio link failure occurs in a backhaul link of the IAB-node under the first donor device;

that the IAB-node is handed over from the first donor device to the second donor device; and

that the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device;

wherein in a case where the IAB-node maintains connection with the first donor device and adds an air interface connection with the second donor device, the receiver receives a first RRC reconfiguration message; and

wherein the first RRC reconfiguration message includes secondary cell group (SCG) configuration information and the second TNL address used for the first F1-C connection, and the IAB-node adds the second TNL address for the first F1-C connection.

Assignments (2)

Continuity (2)

References Cited (17)