Node B and RNC actions during a serving HSDPA cell change

• US 7,433,337 B2
• Filed: 04/04/2003
• Issued: 10/07/2008
• Est. Priority Date: 04/05/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Chao, Yi-Ju
• Primary Examiner(s): Milord; Marceau
• Application Number:
  US10/407,559
• Publication Number:
  US 20080171554A1
• Time in Patent Office: 2,013 Days
• Field of Search: 370/331, 370/329, 370/332, 370/341, 370/342, 370/469, 370/335, 370/338, 455/439, 455/450, 455/463
• US Class Current: 370/331
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04W 36/023 Buffering or recovering information during reselection
• CPC Class Codes: H04W 72/569 of the traffic information

Abstract

A system and method in accordance with the present invention reduce the amount of data that is stalled in a source Node B after a serving HS-DSCH cell change in a communication system that includes a serving RNC and at least one Node B. In a first embodiment, the RNC temporarily suspends data transmissions from the RNC to the Node B. In a second embodiment, the activation time is used in data scheduling. In a third embodiment, a more robust MCS level is selected. In a fourth embodiment flow control is employed for the data transmitted between the RNC and the Node B.

Claims

1. A method for efficient delivery of data in wireless communications that includes a radio network controller (RNC) associated with at least one Node B, the at least one Node B communicating with a plurality of User Equipment (UEs), at least one of, the plurality of UEs communicating within a cell and undergoing a high-speed downlink shared channel (HS-DSCH) cell change, the method comprising:

determining at the RNC the need for an HS-DSCH cell change and for generating a notification to the at least one Node B regarding the cell change;

suspending at the RNC all further data transmissions to the at least one Node B serving the at least one UE; and

sending from the RNC to the at least one Node B the notification.

2. A method for efficient delivery of data in a wireless communications that includes a radio network controller (RNC) associated with at least one Node B, the at least one Node B communicating with a plurality of User Equipment (UEs), at least one of, the plurality of UEs communicating within a cell and undergoing a high-speed downlink shared channel (HS-DSCH) cell change, the method comprising:

receiving at the at least one Node B, a notification of the HS-DSCH cell change for the at least one UE undergoing a HS-DSCH cell change;

scheduling a greater amount of resources for transmission of data from the at least one Node B for transmission to the at least one UE based in part on the notification;

applying a modulation and coding set (MCS) level to the scheduled data;

and transmitting the modulated data to the at least one UE.

3. The method of claim 2 wherein the applying step applies MCS levels such that a greater amount of resources are applied to data for transmission to the at least one UE undergoing a HS-DSCH cell change than to data for transmission to other UEs.

4. The method of claim 2 wherein the receiving step is such that the notification includes an activation time, which indicates when the at least one UE will cease communicating within the cell.

5. The method of claim 4 wherein the scheduling step schedules a greater amount of resources to data for transmission to the at least one UE than to data for transmission to other UEs, such that the data for transmission to the at least one UE is sent to the at least one UE prior to the activation time.

6. The method of claim 4 wherein the applying step applies an MCS level such that a greater amount of resources are applied to data for transmission to the at least one UE than to data for transmission to other UEs, such that the data for transmission to the at least one UE is sent to the at least one UE prior to the activation time.

7. A method for efficient delivery of buffered data in a wireless communications that includes a radio network controller (RNC) associated with at least one Node B, the at least one Node B communicating with a plurality of User Equipment (UEs), at least one of, the plurality of UEs communicating within a cell and undergoing a high-speed downlink shared channel (HS-DSCH) cell change, the method comprising:

determining at the RNC the need for an HS-DSCH cell change and for generating a notification to the at least one Node B regarding the cell change;

sending from the RNC to the at least one Node B the notification; and

performing flow control at the RNC, such that data for transmission to the at least one UE is sent at a higher rate from the RNC to the at least one Node B.

8. A Node B which efficiently receives and buffers data, the Node B communicating with a radio network controller (RNC) and with a plurality of User Equipment (UEs), at least one of the UEs undergoing a high-speed downlink shared channel (HS-DSCH) cell change, the Node B comprising:

a receiver for receiving a notification from the RNC which indicates the cell change;

a scheduler for scheduling a greater amount of resources to data for transmission to the at least one UE based in part on the notification;

an MCS unit for applying a modulation and coding set (MCS) level to the scheduled data; and

a transmitter for transmitting the modulated data to the at least one UE.

9. The Node B of claim 8 wherein the MCS unit applies an MCS level such that a greater amount of resources are applied to data for transmission to the at least one UE than to data for transmission to other UEs.

10. The Node B of claim 8 wherein the notification includes an activation time, which indicates when the at least one UE will cease communicating within the cell.

11. The Node B of claim 8 wherein the Node B further performs flow control, such that data for transmission to the at least one UE is sent at a higher rate from the RNC to the at least one Node B.

12. A radio network controller (RNC) for providing efficient delivery of data, the RNC comprising:

a processor configured to determine the need for a high-speed downlink shared channel (HS-DSCH) cell change for at least one UE communicating with at least one Node B and for generating a notification to the at least one Node B regarding the cell change;

a transmitter configured to suspend all further data transmissions to the at least one Node B serving the at least one UE; and

the transmitter configured to send to the at least one Node B the notification.

13. A radio network controller (RNC) for providing efficient delivery of data, the RNC comprising:

a processor configured to determine the need for a high-speed downlink shared channel (HS-DSCH) cell change for at least one UE communicating with at least one Node B and for generating a notification to the at least one Node B regarding the cell change;

a transmitter configured to send to the at least one Node B the notification; and

the processor configured to perform flow control on data for transmission to the at least one UE, such that the transmitter sends data for transmission to the at least one UE at a higher rate from the RNC to the at least one Node B.