Session setup and handover method and device thereof

Patent metadata

Field	Value
Publication number	US-12495334-B2
Application number	US-202117759283-A
Country	US
Kind code	B2
Filing date	Jan 12, 2021
Priority date	Jan 22, 2020
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

A method and a device for session setup and handover in a wireless communication system are provided. The method comprises receiving, from a second node, a message comprising a single network slice selection assistance information (S-NSSAI) of a protocol data unit (PDU) session; and allocating session resources for the PDU session based on the message received from the second node, wherein, in case that the S-NSSAI of the PDU session is supported by the first node, the session resources for the PDU session includes resources related to the S-NSSAI of the PDU session, and wherein, in case that the S-NSSAI of the PDU session is unsupported by the first node or the resources related to the S-NSSAI are unavailable or overloaded, the session resources for the PDU session includes other available resources for the PDU session.

First claim

The invention claimed is:

1 . A method performed by a first base station in a wireless communication system, the method comprising:
receiving, from a second base station, a first message comprising at least one first single network slice selection assistance information (S-NSSAI) associated with a protocol data unit (PDU) session and at least one second S-NSSAI related to a resource re-selection for the PDU session; and based on a resource related to the at least one first S-NSSAI being overloaded, allocating a resource for the PDU session based on the at least one second S-NSSAI.

2 . The method of claim 1 , wherein the resource for the PDU session is allocated based on at least one of quality of service (QOS) parameters of QoS flows in the PDU session, network slice resources supported by a base station serving a user equipment (UE), or configuration of network operation and maintenance.

3 . The method of claim 1 , wherein the first message comprises network slice policy information, and
wherein the network slice policy information comprises one or more assisting S-NSSAI.

4 . The method of claim 1 , wherein the at least one second S-NSSAI comprises a plurality of assisting S-NSSAI with different priorities, and
wherein resources related to an assisting S-NSSAI with a specific priority among the plurality of assisting S-NSSAI are prioritized.

5 . The method of claim 3 , wherein the network slice policy information is generated or updated by an access control and mobility management function (AMF) entity or a session management function (SMF) entity.

6 . The method of claim 3 , wherein the network slice policy information is based on a network slice policy information received from a user equipment (UE).

7 . The method of claim 3 , wherein the network slice policy information is generated or updated based on a network slice selection policy (NSSP), subscription information of a user equipment (UE), quality of service (QOS) information of a service, and S-NSSAI supported by a base station serving the UE.

8 . A first base station in a wireless communication system, the first base station comprising:
a transceiver; and a controller connected with the transceiver, wherein the controller is configured to:
receive, from a second base station via the transceiver, a first message comprising at least one first single network slice selection assistance information (S-NSSAI) associated with a protocol data unit (PDU) session and at least one second S-NSSAI related to a resource re-selection for the PDU session, and
based on a resource related to the at least one first S-NSSAI being overloaded, allocate a resource for the PDU session based on the at least one second S-NSSAI.

9 . The first base station of claim 8 , wherein the resource for the PDU session is allocated based on at least one of quality of service (QOS) parameters of QoS flows in the PDU session, network slice resources supported by a base station serving a user equipment (UE), or configuration of network operation and maintenance.

10 . The first base station of claim 8 , wherein the first message comprises network slice policy information, and
wherein the network slice policy information comprises one or more assisting S-NSSAI.

11 . The first base station of claim 8 , wherein the at least one second S-NSSAI comprises a plurality of assisting S-NSSAI with different priorities, and
wherein resources related to an assisting S-NSSAI with a specific priority among the plurality of assisting S-NSSAI are prioritized.

12 . The first base station of claim 10 , wherein the network slice policy information is generated or updated by an access control and mobility management function (AMF) entity or a session management function (SMF) entity.

13 . The first base station of claim 10 , wherein the network slice policy information is based on a network slice policy information received from a user equipment (UE).

14 . The method of claim 1 , further comprising:
in response to the first message, transmitting a second message to the second base station, wherein the second message includes information related to at least one other S-NSSAI associated with the PDU session.

15 . The method of claim 14 , further comprising:
transmitting, to an access and mobility management function (AMF), a third message including the information related to the at least one other S-NSSAI associated with the PDU session.

16 . The first base station of claim 8 , wherein the controller is further configured to:
in response to the first message, transmit a second message to the second base station via the transceiver, and wherein the second message includes information related to at least one other S-NSSAI associated with the PDU session.

17 . The first base station of claim 16 , wherein the controller is further configured to:
transmit, to an access and mobility management function (AMF) via the transceiver, a third message including the information related to the at least one other S-NSSAI associated with the PDU session.

18 . The method of claim 14 , wherein the second message is an acknowledgement message for a handover request.

19 . The method of claim 1 , wherein the first message is a message for a handover request.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Xu Lixiang
• Li Lisi
• Wang Weiwei
• Wang Hong

Classifications

• H04W36/0011

  for data sessions of end-to-end connection · CPC title

• H04W80/10 Primary

  adapted for {application} session management, e.g. SIP [Session Initiation Protocol] {(connection management H04W76/00; arrangements for session management H04L67/14)} · CPC title

• H04W76/10

  Connection setup · CPC title

• H04W76/12

  Setup of transport tunnels · CPC title

• H04W72/543

  based on requested quality, e.g. QoS · CPC title