1. A method, comprising:communicating with a user equipment according to Fractional DPCH and with a signaling radio bearer mapped onto a high-speed downlink shared channel (HS-DSCH);
then receiving, by a network node, a measurement report from the user equipment;
making a decision, by the network node, based on the measurement report, to make a serving cell change from a current serving HS-DSCH cell to a new serving HS-DSCH cell and to make an active set update;
preparing, by the network node, a radio link at the new serving HS-DSCH cell to operate as a new serving HS-DSCH radio link for the user equipment;
stopping a user plane transmission with the user equipment over a current serving HS-DSCH radio link in the current serving HS-DSCH cell;
then sending, by the network node, an active set update message to the user equipment, said active set update message including an order and a cell change information, the order directing the user equipment to make one or more of the following modifications to an active set of a connection: radio link addition and radio link removal, and the cell change information comprising information indicating a new serving HS-DSCH radio link in the new serving HS-DSCH cell;
receiving, at the network node, an active set update complete message from the user equipment; and
starting, by the network node, a user plane transmission with the user equipment using the new serving HS-DSCH radio link in the new serving HS-DSCH cell, responsive to a combination of frame protocol flow control granting permission and either of L1 synchronization being indicated to the network node or elapse of a defined period of time.