Method and device for controlling set-up of user-plane bearer

  • US 10,701,753 B2
  • Filed: 03/22/2016
  • Issued: 06/30/2020
  • Est. Priority Date: 03/31/2015
  • Status: Active Grant
First Claim
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1. A method for controlling a user-plane bearer to be established, the method comprises:

  • determining, by a Mobility Management Entity, MME, whether a Serving Gateway, SGW, needs to transmit buffered downlink data to a User Equipment, UE, in a Tracking Area Update, TAU, procedure;

    in response to a determination that the SGW needs to transmit buffered downlink data to the UE in the TAU procedure, initiating, by the MME, a procedure of establishing a user-plane bearer for the UE;

    in response to a determination that the SGW does not need to transmit buffered downlink data to the UE in the TAU procedure and the UE does not need to transmit uplink data in the TAU procedure, not initiating, by the MME, the procedure of establishing a user-plane bearer for the UE,wherein the determining, by the MME, that the SGW needs to transmit buffered downlink data to the UE comprises;

    determining, by the MME, a time or receiving a Context Request message of a new MME which is relocated, is earlier than a recorded timestamp, the recorded timestamp is determined by the MME from a length of time for which the MME indicates the SGW to buffer downlink data of the UE in case of determining that the UE is unreachable;

    or the recorded timestamp is a sum of time when the MME indicates the SGW to buffer downlink data of the UE in a case of determining that the UE is unreachable, and a length of time for which the MME indicates the SGW to buffer downlink data of the UE;

    ordetermining by the MME, that a time when a bearer related message of the SGW is received is earlier than a recorded timestamp, which is determined by the MME from a length of time for which the MME indicates the SGW to buffer downlink data of the UE in a case of determining that the UE is unreachable, or which is a sum of a time when the MME indicates the SGW to buffer downlink data of the UE in a case of determining that the UE is unreachable, and a length of time for which the MME indicates the SGW to buffer downlink data of the UE.

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