System and method for iab handovers

Patent metadata

Field	Value
Publication number	US-2022014976-A1
Application number	US-202117482933-A
Country	US
Kind code	A1
Filing date	Sep 23, 2021
Priority date	Mar 28, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

Systems and methods for a handover (HO) for a migrating node are disclosed herein. In one embodiment, the system and method are configured to send, by a central unit (CU) to a target distributed unit (DU), a user equipment (UE) context setup request configured to create a UE context and to set up at least one bearer, and receiving, by the CU from the target DU, a UE context setup response responsive to the UE context setup request.

First claim

What is claimed is:

1 . A method, comprising:
sending, by a central unit (CU) to a target distributed unit (DU), a user equipment (UE) context setup request configured to create a UE context and to set up at least one bearer; and receiving, by the CU from the target DU, a UE context setup response responsive to the UE context setup request.

2 . The method of claim 1 , wherein the UE context setup request comprises a radio link control (RLC) to-be-setup list information element (IE)

3 . The method of claim 2 , wherein the RLC to-be-setup list comprises at least one of control signaling, user packet indication, a backhaul RLC channel level quality-of-service (QoS) profile, a UE bearer level QoS profile, a QoS flow-level QoS profile for user plane backhaul RLC channel, or a signaling radio bearer (SRB) QoS profile.

4 . The method of claim 1 , wherein the UE context setup request comprises a route list information element (IE) based on which the target DU configures a route table.

5 . The method of claim 4 , wherein the route list IE comprises at least a route identifier and a QoS identification list.

6 . The method of claim 5 , wherein only data that is in the QoS identification list is transferred via routes corresponding to the route identifier.

7 . A method, comprising:
sending, by a central unit (CU), a route reconfiguration request to each of downstream IAB nodes of the IAB node responsive to updates to a route table; and receiving, by the CU from each of the downstream IAB nodes, a route reconfiguration response.

8 . The method of claim 7 , wherein the route table reconfiguration request comprises a route list IE based on which the target DU configures a route table.

9 . The method of claim 7 , wherein the IAB node is configured to change a destination address of a source path in an adaptation layer of transmitted data to a destination address of a target path.

10 . A central unit (CU), comprising:
at least one processor and a transceiver configured to:
send, to a target distributed unit (DU), a user equipment (UE) context setup request configured to create a UE context and to set up at least one bearer; and
receive, from the target DU, a UE context setup response responsive to the UE context setup request.

11 . The CU of claim 10 , wherein the UE context setup request comprises at least one of: a radio link control (RLC) to-be-setup list information element (IE), or a route list information element (IE) based on which the target DU configures a route table.

12 . The CU of claim 11 , wherein the RLC to-be-setup list comprises at least one of control signaling, user packet indication, a backhaul RLC channel level quality-of-service (QoS) profile, a UE bearer level QoS profile, a QoS flow-level QoS profile for user plane backhaul RLC channel, or a signaling radio bearer (SRB) QoS profile.

13 . The CU of claim 11 , wherein the route list IE comprises at least a route identifier and a QoS identification list.

14 . The CU of claim 13 , wherein only data that is in the QoS identification list is transferred via routes corresponding to the route identifier.

15 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 1 .

16 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 2 .

17 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 3 .

18 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 4 .

19 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 5 .

20 . A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of claim 7 .

Assignees

• Zte Corp

Inventors

• Luo Wei
• Chen Lin

Classifications

• H04W36/0064 Primary

  of control information between different access points · CPC title

• H04W40/36

  due to handover · CPC title

• H04W84/047

  using dedicated repeater stations · CPC title

• H04W40/248

  Connectivity information update · CPC title

• H04W36/0033 Primary

  with transfer of context information · CPC title