Patent ID: 8831034
Filing Date: 2014-09-09
Classification: H04W

Abstract:
1. A method in a radio network node for controlling uplink transmission from at least one user equipment to arrive time aligned with a time slot structure at the radio network node, wherein the time slot structure is a sequence of time slots, each time slot having a time slot period, wherein the method comprises the steps of: A) receiving from said at least one user equipment a timing uplink transmission; B) determining a timing offset based on the timing uplink transmission, wherein the timing offset is indicative of a distance in time between the radio network node and said at least one user equipment; C) comparing the timing offset to a threshold value for determining a timing advance value to be sent to said at least one user equipment, and performing steps D1) and D2): D1) when the timing offset is less than the threshold value, setting the timing advance value to the timing offset, wherein a time-aligned uplink transmission from said at least one user equipment is caused to arrive at the radio network node time aligned with a first uplink time slot, and D2) when the timing offset is greater than or equal to the threshold value, setting the timing advance value to the timing offset reduced by one or more time slot periods, wherein a time-aligned uplink transmission from said at least one user equipment is caused to arrive at the radio network node time aligned with a second uplink time slot that is later than the first uplink time slot, and the method further comprises a step of: E) sending to said at least one user equipment the timing advance value.