Granted Patent B2

US 12,587,915 · App. 17/960,223 · Granted Mar 24, 2026

Inventors: Mengjie Zhang (Shenzhen, CN); He Huang (Shenzhen, CN); Jing Liu (Shenzhen, CN); Li Yang (Shenzhen, CN)

Assignee: ZTE Corporation

H04W36/0061H04W36/0069H04W36/00837H04W36/362

Abstract

Claims (30)

1 . A method comprising:

receiving, by a target master wireless communication node (MN) from a source master wireless communication node (MN), a handover request to begin a handover procedure;

transmitting, by the target MN to a target secondary wireless communication node (SN), a first message to inform the target SN about a type of SN addition or change procedure to perform the handover request, the type of SN addition or change procedure selected from among a first type comprising a conditional primary secondary cell addition or change (CPAC) procedure or a second type comprising a primary secondary cell (PSCell) addition or change for a conditional handover (CHO) procedure;

receiving, by the target MN from the target SN, a second message which informs the target MN of one or more configured PSCells; and

transmitting, by the target MN to the source MN, a handover request acknowledge message which includes the one or more configured PSCells.

2 . The method of claim 1 , wherein the target MN transmits the first message to the target SN via X2 or Xn signaling, wherein the first message includes an information element that includes a CPAC indicator or a PSCell addition or change for CHO indicator.

3 . The method of claim 1 , wherein the source MN sends an indicator to a source SN via X2 or Xn signaling, and the source SN starts data forwarding, wherein the indicator comprises a CHO indicator.

4 . The method of claim 1 , wherein the handover request includes a CHO indicator.

5 . A target master wireless communication node (MN), comprising: at least one processor and a transceiver configured to:

receive, from a source master wireless communication node (MN), a handover request to begin a handover procedure; and

transmit, to a target secondary wireless communication node (SN), a first message to inform the target SN about a type of SN addition or change procedure to perform the handover request, the type of SN addition or change procedure selected from among a first type comprising a conditional primary secondary cell addition or change (CPAC) procedure or a second type comprising a primary secondary cell (PSCell) addition or change for a conditional handover (CHO) procedure;

receive, from the target SN, a second message which informs the target MN of one or more configured PSCells; and

transmit, to the source MN, a handover request acknowledge message which includes the one or more configured PSCells.

6 . The target MN of claim 5 , wherein the target MN transmits the first message to the target SN via X2 or Xn signaling, wherein the first message includes an information element that includes a CPAC indicator or a PSCell addition or change for CHO indicator.

7 . The target MN of claim 5 , wherein the source MN sends an indicator to a source SN via X2 or Xn signaling, and the source SN starts data forwarding, wherein the indicator comprises a CHO indicator.

8 . The target MN of claim 5 , wherein the handover request includes a CHO indicator.

9 . A method comprising:

transmitting, by a source master wireless communication node (MN) to a target master wireless communication node (MN), a handover request to begin a handover procedure,

wherein the target MN transmits to a target secondary wireless communication node (SN), a first message to inform the target SN about a type of SN addition or change procedure to perform the handover request, the type of SN addition or change procedure selected from among a first type comprising a conditional primary secondary cell addition or change (CPAC) procedure or a second type comprising a primary secondary cell (PSCell) addition or change for a conditional handover (CHO) procedure, and receives, from the source SN, a second message which informs the target MN of one or more configured PSCells; and

receiving, by the source MN from the target MN, a handover request acknowledge message which includes the one or more configured PSCells.

10 . The method of claim 9 , wherein the target MN transmits the first message to the target SN via X2 or Xn signaling, wherein the first message includes an information element that includes a CPAC indicator or a PSCell addition or change for CHO indicator.

11 . The method of claim 9 , wherein the source MN sends an indicator to a source SN via X2 or Xn signaling, and the source SN starts data forwarding, wherein the indicator comprises a CHO indicator.

12 . The method of claim 9 , wherein the handover request includes a CHO indicator.

13 . A source master wireless communication node (MN), comprising: at least one processor and a transceiver configured to:

transmit, to a target master wireless communication node (MN), a handover request to begin a handover procedure,

wherein the target MN transmits to a target secondary wireless communication node (SN), a first message to inform the target SN about a type of SN addition or change procedure to perform the handover request, the type of SN addition or change procedure selected from among a first type comprising a conditional primary secondary cell addition or change (CPAC) procedure or a second type comprising a primary secondary cell (PSCell) addition or change for a conditional handover (CHO) procedure, and receives, from the source SN, a second message which informs the target MN of one or more configured PSCells; and

receive, from the target MN, a handover request acknowledge message which includes the one or more configured PSCells.

14 . The source MN of claim 13 , wherein the target MN transmits the first message to the target SN via X2 or Xn signaling, wherein the first message includes an information element that includes a CPAC indicator or a PSCell addition or change for CHO indicator.

15 . The source MN of claim 13 , wherein the transceiver is configured to send an indicator to a source SN via X2 or Xn signaling, and the source SN starts data forwarding, wherein the indicator comprises a CHO indicator.

16 . The method of claim 13 , wherein the handover request includes a CHO indicator.

Assignments (1)

Continuity (2)

References Cited (19)