Method for moving a receive window in radio access network

• US 20040184437A1
• Filed: 11/06/2003
• Published: 09/23/2004
• Est. Priority Date: 11/07/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young Dae, Lee, So Young, Yi, Seung June
• Granted Patent: US 7,539,197 B2
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 1/187 Details of sliding window management
• CPC Class Codes: H04L 1/1877 for semi-reliable protocols, e.g. for less sensitive applications like streaming video buffer level management for video bitstream control arrangements H04N21/44004
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 47/225 Determination of shaping rate, e.g. using a moving window
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02

Abstract

A method of moving a receiving window in a wireless mobile communication system, wherein the AM RLC of the transmitting side sends information of the last discarded SDU regardless of continuity of the discarded SDUs. The AM RLC of the receiving side checks whether all SDUs from the start point of the receiving window up to the last discarded SDU are successfully received, delivers the SDUs that are successfully received to an upper layer, and discard only those SDUs that are not successfully received.

Claims

1. A data communication method in a radio communication system, comprising:

receiving a move receiving window (MRW) command; and

delivering to an upper layer, successfully received service data units (SDUs) among data units from a start point of a current receiving window to a position that is indicated by the MRW command.

2. The method of claim 1, wherein the MRW command is transmitted through a radio environment.

3. The method of claim 1, wherein the data units are service data units (SDUs) of a data link layer.

4. The method of claim 3, wherein the data units are radio link control (RLC) SDUs.

5. The method of claim 1, wherein the SDUs are identified by a SDU boundary indicator.

6. The method of claim 5, wherein the SDU boundary indicator is included in a protocol data unit (PDU) of a data link layer.

7. The method of claim 1, wherein the SDUs that are not yet successfully received are discarded.

8. The method of claim 1, wherein the position that is indicated by the MRW command indicates an end point of the SDU that has been discarded last.

9. The method of claim 1, wherein the steps are performed in a receive-response mode.

10. The method of claim 1, wherein the MRW command includes:

a sequence number of a protocol data unit (PDU) with an end point of a last discarded SDU; and

an end point indicator indicating the end point of the SDU in the PDU.

11. The method of claim 1, further comprising:

moving the receiving window to the position indicated by the MRW command.

12. The method of claim 11, wherein the moving of the receiving window is performed in a data link layer.

13. A method for moving a receiving window in a radio communication system, comprising:

receiving information of a last discarded service data unit (SDU) from a transmitting side;

checking whether service data units (SDUs) prior to the last discarded service data unit are successfully received; and

delivering the SDUs that are successfully received to a upper layer and moving a receiving window in accordance with the information.

14. The method of claim 13, wherein the SDU is a radio link control (RLC) SDU.

15. The method of claim 13, wherein the information for the last discarded SDU comprises:

a sequence number of a protocol data unit (PDU) with an end point of the last discarded SDU; and

an end point indicator indicating the end point of the SDU in the PDU.

16. The method of claim 13, wherein the moving of the receiving window is performed in a data link layer.

17. The method of claim 13, wherein the SDU is identified by the end point indicator.

18. The method of claim 13, wherein the checking step comprises:

identifying data from a portion indicated by one SDU end point indicator to a portion indicated by an adjacent SDU end point indicator as one SDU; and

determining that the SDU is successfully received if all portions of the identified SDU are received.

19. In a radio communication system, a method of discarding service data units by a sending end employing a transmission window and a discard trigger, the method comprising:

checking all service data units beginning with a first service data unit located at a lower edge of the transmission window up to a last service data unit that was discarded by the discard trigger; and

discarding those checked service data units that have not been positively acknowledged.

20. The method of claim 19, wherein the checking further comprises a step of checking whether positive acknowledgement was received from a receiving end for any service data units that have been successfully sent to a receiving end.

21. The method of claim 19, further comprising a step of sending, to a receiving end, a command to move a reception window and information of the last discarded service data unit.

22. In a radio communication system, a method of discarding service data units by a receiving end employing a reception window, the method comprising:

receiving a command to move the reception window;

checking all service data units beginning with a first service data unit located at a lower edge of the reception window up to a last service data unit indicated in the command; and

discarding those checked service data unit that have not been successfully received.