Active set update (ASU) with high speed downlink shared channel (HS-DSCH) information

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 L 1 synchronization being indicated to the network node or elapse of a defined period of time.

2. The method of claim 1 , wherein the steps of claim 1 are executed by an integrated circuit.

3. The method of claim 1 , wherein the measurement report comprises an intra-frequency reporting event.

4. The method of claim 1 , wherein the order in the active set update message directs the user equipment to remove a current serving HS-DSCH radio link at the current serving HS-DSCH cell.

5. The method of claim 1 , wherein said cell change information further comprises a MAC-hs reset indicator to indicate that a MAC-hs entity needs to be reset.

6. The method of claim 1 , wherein said cell change information further comprises a new HS-DSCH Radio Network Temporary Identifier (New H-RNTI).

7. The method of claim 1 , wherein the communicating step comprises communicating a user plane transmission related to the signaling radio bearer mapped onto HS-DSCH, with the user equipment using the current serving HS-DSCH radio link at the current serving HS-DSCH cell;

and wherein the starting step starts a user plane transmission related to a signaling radio bearer mapped onto HS-DSCH, with the user equipment using the new serving HS-DSCH radio link in the new serving HS-DSCH cell.

8. An apparatus, comprising:

a receiver configured to receive a measurement report from a user equipment regarding communications with the user equipment according to Fractional DPCH and with a signaling radio bearer mapped onto a high-speed downlink shared channel (HS-DSCH);

a decider configured to decide, 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;

a preparer configured to prepare a radio link at the new serving HS-DSCH cell to operate as a new serving HS-DSCH radio link for the user equipment; and

a sender configured to send 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; and

a starter configured to start 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 L 1 synchronization being indicated or elapse of a defined period of time;

wherein said receiver is further configured to receive an active set update complete message from the user equipment;

and wherein said apparatus is configured to stop a user plane transmission with the user equipment over a current serving HS-DSCH radio link in the current serving HS-DSCH cell, prior to the sender sending the active set update message to the user equipment.

9. The apparatus of claim 8 , wherein said cell change information further comprises a MAC-hs reset indicator.

10. The apparatus of claim 8 , wherein said cell change information further comprises a new HS-DSCH Radio Network Temporary Identifier (New H-RNTI).

11. A non-transitory computer readable storage medium embedded with a computer program, comprising programming code for:

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 a measurement report from the user equipment;

making a decision, 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 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 using a current serving HS-DSCH radio link in the current serving HS-DSCH cell;

then sending 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 an active set update complete message from the user equipment; and

responsive to a combination of frame protocol flow control granting permission and either of L 1 synchronization being indicated or elapse of a defined period of time, starting a user plane transmission with the user equipment using the new serving HS-DSCH radio link in the new serving HS-DSCH cell.