Patent ID: 9699702
Date: 2017-07-04
CPC Classifications: H04L,H04W

Claim:
1. A target master evolved Node-B (MeNB) for a mobile communication system supporting dual connectivity communication using: an MeNB that establishes a radio resource control (RRC) connection with a user equipment (UE); and a secondary evolved Node-B (SeNB) that provides additional radio resources to the UE, the target MeNB comprising: a controller containing at least one processor and at least one memory, wherein the controller controls an inter-MeNB handover procedure that performs handover of the UE from a source MeNB to the target MeNB without changing the SeNB, wherein the controller causes the target MeNB to: receive a handover request message from the source MeNB, the handover request message including a global eNB ID of the SeNB; transmit an SeNB addition request message to the SeNB in response to receiving the handover request message, the SeNB addition request message used to configure the SeNB as a new SeNB for the target MeNB; receive, from the SeNB, an SeNB addition request acknowledgement message, which is a response to the SeNB addition request message, the SeNB addition request acknowledgement message including algorithm information indicating a security algorithm selected by the SeNB to perform communication with the UE; and transmit, to the source MeNB, a handover request acknowledgement message, which is a response to the handover request message, in response to receiving the SeNB addition request acknowledgement message, the handover request acknowledgement message including the algorithm information received from the SeNB.