Network Node, User Equipment and Methods Therein for Adjusting the Transmit Timing of Uplink Transmissions

摘要

Methods and devices for adjusting timing of uplink transmissions to a network node in a telecommunications system are provided. A user equipment (“UE”) is configurable with more than one aggregated serving cells that are divided into one or more groups of serving cells based on a timing advance value. The one or more groups of serving cells each comprises a timing reference serving cell. The reception timing of a downlink transmission from a timing reference serving cell is used as an uplink timing reference for the timing reference serving cell. The UE determines a change to a second timing reference serving cell and applies an incremental adjustment of the transmit timing of uplink transmissions for the serving cells in the group of serving cells with respect to a timing reference based on the reception timing of a downlink transmission from the second timing reference serving cell in the UE.

主权项

1. A method in a user equipment for adjusting a transmit timing of uplink transmissions to a network node in a telecommunications system, the user equipment configurable with more than one aggregated serving cells that are grouped into one or more groups of serving cells based on a timing advance value of each of the aggregated serving cells, the one or more groups of serving cells each comprising a timing reference serving cell, wherein reception timing of a downlink transmission from a timing reference serving cell is used as a timing reference for the transmit timing of uplink transmissions for the serving cells in the group of serving cells comprising the timing reference serving cell, respectively, the method comprising:
determining a change to a second timing reference serving cell in a group of serving cells, the second timing reference serving cell being different from a first timing reference serving cell currently being used as the timing reference serving cell for the group of serving cells; and applying an incremental adjustment of transmit timing of uplink transmissions for the serving cells in the group of serving cells with respect to a timing reference, the incremental adjustment based on reception timing of a downlink transmission from the second timing reference serving cell at the user equipment, wherein the incremental adjustment comprises two or more adjustments gradually applied in the incremental adjustment.