Patent ID: 8300595
Filing Date: 2012-10-30
Classification: H04W

Abstract:
1. A method for a handover procedure of a user terminal on radio interfaces from a source base station (SBS) to a target base station the method comprising, using the target base station, sending downlink transmission of u-plane user data to the user terminal before the target base station receives a message indicating termination of the handover procedure; using the target base station, receiving at least one uplink feedback message associated to the downlink transmission of said u-plane user data from the user terminal, wherein the at least one uplink feedback message is an acknowledgment (ACK) or a negative acknowledgment (NACK) received from the user terminal independent of receipt of uplink u-plane user data from the user terminal; and wherein the target base station uses said at least one message associated to the downlink transmission of said u-plane user data as an indication of the presence of the user terminal within the range of the target base station, wherein the target base station sends u-plane user data to the user terminal after any uplink or downlink control L1/L2 signaling associated with the handover procedure and prior to reception of the message indicating the termination of the handover procedure; and wherein the message indicating the termination of the handover procedure is one of an HO complete message and a Feedback (ACK/NACK) message.