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Mobile communication system, SGW, terminal communication method and control method

  • US 9,918,261 B2
  • Filed: 05/09/2014
  • Issued: 03/13/2018
  • Est. Priority Date: 05/20/2013
  • Status: Active Grant
First Claim
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1. A mobile communication system comprising:

  • a terminal (UE);

    a MME (Mobility Management Entity) or a SGSN (Serving GPRS Support Node); and

    a SGW (Serving Gateway);

    wherein the SGW is configured to receive and to buffer a packet for the UE and to send a Downlink Data Notification message to the MME or the SGSN; and

    the MME or the SGSN is configured to send a Downlink Data Notification Acknowledge message to the SGW in response to the Downlink Data Notification message,wherein the Downlink Data Notification Acknowledge message contains a cause value indicating a temporary rejection due to UE mobility, and the SGW buffers the packet until receiving a Modify Bearer Request message.

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