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US-20260129512-A1 - DATA PACKET DISCARD REDUCTION FOR HANDOVER PROCEDURES

US20260129512A1US 20260129512 A1US20260129512 A1US 20260129512A1US-20260129512-A1

Abstract

Various aspects of the present disclosure generally relate to wireless communication. A user equipment (UE) may receive, from a source network node, information associated with a handover from the source network node to a target network node. The UE may transmit, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based on the information associated with the PDU. The UE may receive, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information. Numerous other aspects are described.

Inventors

  • Ming Yang
  • Kausik Ray Chaudhuri
  • Juan Montojo

Assignees

  • QUALCOMM INCORPORATED

Dates

Publication Date
20260507
Application Date
20241106

Claims (20)

  1. 1 . A user equipment (UE) for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: receive, from a source network node, information associated with a handover from the source network node to a target network node; transmit, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based at least in part on the information associated with the PDU; and receive, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information.
  2. 2 . The UE of claim 1 , wherein the one or more processors are further configured to cause the UE to: transmit, to the source network node, capability information indicating support for a scheme for reducing discarded PDUs after handover, wherein transmitting the request for the target network node to discard the first subset of PDUs based at least in part on the information associated with the PDU is in accordance with the scheme.
  3. 3 . The UE of claim 2 , wherein the one or more processors, to cause the UE to receive the information associated with the handover from the source network node to the target network node, are configured to cause the UE to: receive an indication to enable the scheme for reducing discarded PDUs after handover based at least in part on the capability information.
  4. 4 . The UE of claim 1 , wherein the information associated with the PDU includes a sequence number associated with the PDU based at least in part on a state of the timer.
  5. 5 . The UE of claim 4 , wherein the state of the timer is expired.
  6. 6 . The UE of claim 4 , wherein the state of the timer is a remaining time failing to satisfy a threshold.
  7. 7 . The UE of claim 6 , wherein the threshold is associated with a latency parameter that is associated with an application, and wherein the application is associated with the set of PDUs scheduled for transmission to the UE.
  8. 8 . The UE of claim 1 , wherein the one or more processors are further configured to cause the UE to: store the second subset of PDUs, wherein the second subset of PDUs are associated with a respective plurality of timers that are not expired based at least in part on transmitting the information associated with the PDU.
  9. 9 . The UE of claim 1 , wherein the information associated with PDU and the request for the target network node to discard a first subset PDUs are transmitted via radio resource control (RRC) signaling that indicates the handover is complete.
  10. 10 . The UE of claim 1 , wherein the information associated with PDU and the request for the target network node to discard a first subset PDUs are transmitted via a medium access control element (MAC-CE).
  11. 11 . The UE of claim 1 , wherein the handover is a layer 3 handover procedure, a layer 1 or layer 2 triggered mobility (LTM) procedure, a conditional handover (CHO) procedure, a sequence handover procedure, or a non-sequence handover procedure.
  12. 12 . A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a source network node, information associated with a handover from the source network node to a target network node; transmitting, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based at least in part on the information associated with the PDU; and receiving, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information.
  13. 13 . The method of claim 12 , further comprising: transmitting, to the source network node, capability information indicating support for a scheme for reducing discarded PDUs after handover, wherein transmitting the request for the target network node to discard the first subset of PDUs based at least in part on the information associated with the PDU is in accordance with the scheme.
  14. 14 . The method of claim 13 , wherein receiving the information associated with the handover from the source network node to the target network node comprises: receiving an indication to enable the scheme for reducing discarded PDUs after handover based at least in part on the capability information.
  15. 15 . The method of claim 12 , wherein the information associated with the PDU includes a sequence number associated with the PDU based at least in part on a state of the timer.
  16. 16 . The method of claim 15 , wherein the state of the timer is expired.
  17. 17 . The method of claim 15 , wherein the state of the timer is a remaining time failing to satisfy a threshold.
  18. 18 . The method of claim 17 , wherein the threshold is associated with a latency parameter that is associated with an application, and wherein the application is associated with the set of PDUs scheduled for transmission to the UE.
  19. 19 . The method of claim 12 , further comprising: storing the second subset of PDUs, wherein the second subset of PDUs are associated with a respective plurality of timers that are not expired based at least in part on transmitting the information associated with the PDU.
  20. 20 . A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: receive, from a source network node, information associated with a handover from the source network node to a target network node; transmit, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based at least in part on the information associated with the PDU; and receive, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with packet discard reduction for handover procedures. BACKGROUND Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, and/or other traffic. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication among multiple wireless communication devices including user devices or other devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and/or device transmit power, among other examples). Such multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable different wireless communication devices to communicate on a local, municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR). NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP). NR (and other RATs beyond NR) may be designed to better support enhanced mobile broadband (eL3) access, Internet of things (IoT) networks or reduced capability device deployments, and ultra-reliable low latency communication (URLLC) applications. To support these verticals, NR systems may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO), licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployments, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication), multiple-subscriber implementations, high-precision positioning, and/or radio frequency (RF) sensing, among other examples. As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases. SUMMARY Some aspects described herein relate to a user equipment (UE) for wireless communication. The UE may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive, from a source network node, information associated with a handover from the source network node to a target network node. The one or more processors may be configured to transmit, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based at least in part on the information associated with the PDU. The one or more processors may be configured to receive, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information. Some aspects described herein relate to a target network node for wireless communication. The target network node may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive, from a source network node, an indication of a set of PDUs scheduled for transmission to a UE. The one or more processors may be configured to receive, from the UE after handover of the UE from the source network node to the target network node, information associated with a PDU in the set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request to discard a first subset PDUs of the set of PDUs based at least in part on the information. The one or more processors may be configured to transmit, to the UE, a second subset of PDUs of the set of PDUs based at least in part on the information. Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include receiving, from a source network node, information associated with a handover from the source network node to a target network node. The method may include transmitting, to the target network node after the handover from the source network node to the target network node, information associated with a PDU in a set of PDUs scheduled for transmission to the UE based at least in part on a timer associated with the PDU and a request