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Device and Method of Handling a PDU Session in Inter-system Mobility between a LTE System and a NR/5G System

  • US 20180199355A1
  • Filed: 01/09/2018
  • Published: 07/12/2018
  • Est. Priority Date: 01/10/2017
  • Status: Active Grant
First Claim
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1. A communication device for handling mobility between a new radio (NR)/fifth generation (5G) network and a long-term evolution (LTE) network, comprising:

  • a storage device; and

    a processing circuit, coupled to the storage device, wherein the storage device stores, and the processing circuit is configured to execute instructions of;

    connecting to the NR/5G network;

    communicating a Protocol Data Unit (PDU) Session identity/identifier (ID) identifying a PDU Session with the NR/5G network;

    communicating data of the PDU Session with the NR/5G network;

    disconnecting the NR/5G network, connecting to the LTE network and performing a tracking area update (TAU) procedure with the LTE network;

    disconnecting the LTE network and connecting to the NR/5G network, after performing the TAU procedure; and

    communicating the PDU Session ID identifying the PDU Session with the NR/5G network, when disconnecting the LTE network and connecting to the NR/5G network.

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