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EP-4322691-B1 - PDU SESSION MANAGEMENT METHOD

EP4322691B1EP 4322691 B1EP4322691 B1EP 4322691B1EP-4322691-B1

Inventors

  • KIM, Seokjung
  • KIM, LAEYOUNG
  • YOUN, Myungjune
  • XU, JIAN
  • BYUN, Daewook

Dates

Publication Date
20260506
Application Date
20220324

Claims (14)

  1. A method for performing communication, performed by a Policy Control Function, PCF, comprising: receiving, from an Access and Mobility management Function, AMF, a User Equipment, UE, Policy Container; transmitting, to a UE, an UE route selection policy, URSP, rule, wherein the URSP rule includes a first Route Selection Descriptor, RSD, and a second RSD, wherein the first RSD includes a Protocol Data Unit, PDU, session Pair identifier, ID, wherein the PDU session Pair ID is used to establish two redundant PDU sessions, wherein the second RSD does not include the PDU session Pair ID.
  2. The method of claim 1, wherein the first RSD has a higher priority value than the second RSD.
  3. The method of claim 1 or claim 2, wherein the PDU session Pair ID indicates the two redundant PDU sessions.
  4. The method of any one of claims 1 to 3, wherein the two redundant PDU sessions are paired for redundant transmission.
  5. The method of any one of claims 1 to 4, wherein the UE Policy Container includes information on whether the UE supports a PDU session Pair ID.
  6. A method for performing communication, performed by a User Equipment, UE, comprising: transmitting, to a base station, a registration request message; receiving, from a Policy Control Function, PCF, an UE route selection policy, URSP, rule, wherein the URSP rule includes a first Route Selection Descriptor, RSD, and a second RSD, wherein the first RSD includes a Protocol Data Unit, PDU, session Pair identifier, ID, wherein the PDU session Pair ID is used to establish two redundant PDU sessions, wherein the second RSD does not include the PDU session Pair ID.
  7. The method of claim 6, wherein the first RSD has a higher priority value than the second RSD.
  8. The method of claim 6 or claim 7, wherein the PDU session Pair ID indicates the two redundant PDU sessions.
  9. The method of any one of claims 6 to 8, wherein the two redundant PDU sessions are paired for redundant transmission.
  10. The method of any one of claims 6 to 9, further comprising: checking the first RSD; skipping to check the second RSD, based on the UE recognizing the PDU session Pair ID in the first RSD; performing procedure for establishing the two redundant PDU sessions based on the first RSD, based on the UE recognizing the PDU session Pair ID in the first RSD.
  11. The method of any one of claims 6 to 9, further comprising: checking the first RSD; checking the second RSD, based on the UE not recognizing the PDU session Pair ID in the first RSD; performing procedure for establishing the two redundant PDU sessions based on the second RSD, based on the UE not recognizing the PDU session Pair ID in the first RSD.
  12. The method of any one of claims 6 to 11, wherein the registration request message includes information on whether the UE supports a PDU session Pair ID.
  13. A Policy Control Function, PCF, comprising: a transceiver to transmit a signal and to receive a signal; and a processor to control the transceiver, wherein the processor is configured to perform operation, wherein the operation is the method according to any one of claims 1 to 5.
  14. A User Equipment, UE, comprising: a transceiver; and a processor to control the transceiver, wherein the processor is configured to perform operation, wherein the operation is the method of any one of claims 6 to 12.

Description

TECHNICAL FIELD The present specification relates to mobile communications. BACKGROUND ART 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement. Work has started in international telecommunication union (ITU) and 3GPP to develop requirements and specifications for new radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future. The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. The NR shall be inherently forward compatible. An example of prior art is the 3GPP document S2-1909856 "Clarification on PDU session pair information to NG-RAN (Option 2)" wherein two redundant PDU sessions are matched to the Route Selection Descriptors of distinct URSP rules. Another example is the application WO 2020/256425 A1 wherein the SMF determines the PDU session pair information on which PDU Sessions are paired for redundant transmission. When the paired PDU Session is served by other SMF, the SMF obtains the PDU session pair information for the paired PDU Session from the PCF. Another prior art document is "Clarification on PDU session pair information to NG-RAN (Option 2)", wherein it is disclosed that when two redundant PDU sessions are handled via different SMFs, it is difficult to know the PDU session ID which is handled by the other SMF. TECHNICAL PROBLEM A network needs to comprehensively manage a terminal that does not support a PDU session pair ID and a terminal that supports a PDU session pair ID. TECHNICAL SOLUTION A URSP rule for a terminal supporting a PDU session pair ID and a URSP rule for a terminal not supporting a PDU session pair ID may be created and transmitted to the terminal. ADVANTAGEOUS EFFECTS The present specification may have various effects. For example, through the procedure disclosed in this specification, the network can establish a redundant PDU session by integrally managing a terminal that supports a PDU session pair ID and a terminal that does not support a PDU session pair ID. Effects that can be obtained through specific examples of the present specification are not limited to the effects listed above. For example, various technical effects that a person having ordinary skill in the related art can understand or derive from the present specification may exist. Accordingly, the specific effects of the present specification are not limited to those explicitly described herein, and may include various effects that can be understood or derived from the technical characteristics of the present specification. The present invention is defined by the independent claims, to which reference should now be made. Specific embodiments are defined by the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.FIG. 4 shows an example of UE to which implementations of the present disclosure is applied.FIG. 5 shows an example of a redundant user plane path using dual connectivity.FIG. 6 shows a first example of the first embodiment of the present specification.FIG. 7 and FIG. 8 show a second example of the first embodiment of the present specification.FIGS. 9, 10, 11 and 12 show examples of the third embodiment of the present specification.FIGS. 13 and 14 show examples of the fourth embodiment of the present specification.FIG. 15 shows an example of the fifth embodiment of the present specification.FIG. 16 shows the procedure of PCF for disclosure of the present specification.FIG. 17 shows the procedure of UE for disclosure of the present specification. BEST MODE MODE FOR INVENTION The following techniques, apparatuses, and systems may be applied to a variety of wire