System and method for controlling data call traffic frame in mobile communication system

• US 20030227921A1
• Filed: 06/09/2003
• Published: 12/11/2003
• Est. Priority Date: 06/11/2002
• Status: Abandoned Application

• Current Assignee: LG Nortel Company Limited
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jeon, Sang-Yong
• Application Number:
  US10/456,912
• Publication Number:
  US 20030227921A1
• Time in Patent Office: Days
• US Class Current: 370/394
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints

Abstract

A system and method for controlling a data call traffic frame in a mobile communication system assigns a sequence number to the traffic frame transmitted and received between the SDU and the PCF. This allows for a lost traffic frame to be easily detected. Because lost traffic frames can be detected and re-transmitted between the SDU and PCF, the lost traffic frame can be restored without using a radio section. Thus, transmission reliability between the SDU and PCF can be improved and a waste of radio resources can be prevented.

Claims

1. A method for controlling data call traffic frames in a mobile communication system, comprising:

requesting retransmission of a traffic frame from a transmitting party if a sequence order of the traffic frame received by a receiving party is not in a predetermined order; and

re-transmitting the retransmission-requested traffic frame to the receiving party, wherein the traffic frame and retransmission-requested traffic frame are transmitted between an SDU and a PCF.

2. The method of claim 1, further comprising when the transmitting party is the SDU and the receiving party is the PCF:

transmitting the traffic frame from the SDU to the PCF; and

storing the traffic frame in a temporary buffer.

3. The method of claim 2, further comprising:

deleting a first buffered traffic frame from the first temporary buffer if the temporary buffer with a predetermined capacity is full.

4. The method of claim 2, wherein the re-transmission step comprises:

searching the temporary buffer according to the re-transmission request; and

re-transmitting the traffic frame from the SDU to the PCF if the retransmission requested traffic frame exists in the temporary buffer.

5. The method of claim 4, wherein the SDU maintains buffered traffic frames in the temporary buffer based on a predetermined buffering time corresponding to a size of the temporary buffer.

6. The method of claim 4, further comprising:

transmitting a reset frame for initializing a sequence number from the SDU to the PCF, if the retransmission-requested traffic frame does not exist in the temporary buffer.

7. The method of claim 6, wherein the SDU and the PCF initialize a sequence number of a next-arriving traffic frame with the reset frame.

8. The method of claim 7, wherein the reset frame comprises:

an opposite-party call ID field indicative of a call ID of a frame-receiving side;

an indicator field indicative of frame type; and

a sequence-number field including a sequence number.

9. The method of claim 4, wherein the retransmission request includes a NAK frame transmitted from the PCF to the SDU.

10. The method of claim 9, wherein the NAK frame comprises:

an opposite-party call ID field indicative of a call ID of the side receiving the NAK frame;

an indicator field indicative of frame type; and

a sequence-number field indicative of the sequence number of a traffic frame requested for re-transmission.

11. The method of claim 1, further comprising when the transmitting party is the PCF and the receiving party is the SDU:

transmitting the traffic frame from the PCF; and

storing the traffic frame in a temporary buffer.

12. The method of claim 11, further comprising:

deleting a first buffered traffic frame from the temporary buffer if temporary buffer with a predetermined capacity is full.

13. The method of claim 11, wherein the re-transmission step comprises:

searching the temporary buffer according to the re-transmission request; and

re-transmitting the traffic frame from the PCF to the SDU if the retransmission requested traffic frame exists in the temporary buffer.

14. The method of claim 13, wherein the PCF maintains the buffered traffic frames in the temporary buffer based on a predetermined buffering time which corresponds to a size of the temporary buffer.

15. The method of claim 13, further comprising:

transmitting a reset frame for initializing a sequence number from the PCF to the SDU, if the retransmission-requested traffic frame does not exist in the temporary buffer.

16. The method of claim 15, wherein the SDU and the PCF initialize the sequence number of a next-arriving traffic frame with the reset frame.

17. The method of claim 16, wherein the reset frame comprises:

an opposite-party call ID field indicative of a call ID of the side receiving the reset frame;

an indicator field indicative of frame type; and

a sequence-number field including a sequence number.

18. The method of claim 13, wherein the re-transmission request includes a NAK frame transmitted from the SDU to the PCF.

19. The method of claim 18, wherein the NAK frame comprises:

an opposite-party call ID field indicative of a call ID of the side receiving the NAK frame;

an indicator field indicative of frame type; and

a sequence-number field including a sequence number of a traffic frame requested for re-transmission.

20. A method for controlling data call traffic frames in a mobile communication system, comprising:

transmitting a traffic frame from an SDU to a PCF;

storing the traffic frame in a temporary buffer;

checking a sequence order of the traffic frame when the traffic frame is received by the PCF;

if the sequence order is not in a predetermined order, requesting retransmission of the traffic frame from the SDU;

searching the temporary buffer of the SDU according to the re-transmission request; and

if the retransmission-requested traffic frame is in the temporary buffer, re-transmitting the traffic frame from the SDU to the PCF.

21. The method of claim 20, further comprising:

transmitting a frame for initializing a sequence number from the SDU to the PCF, if the retransmission-requested traffic frame does not exist in the temporary buffer.

22. The method of claim 21, wherein the frame for initializing a sequence number and the frame for re-transmission request each comprise:

an opposite-party call ID field indicative of a call ID of a side receiving the frame;

an indicator field indicative of frame type; and

a sequence-number field including a sequence number.

23. A method for controlling data call traffic frames in a mobile communication system, comprising:

transmitting a traffic frame from a PCF to an SDU;

storing the traffic frame in a temporary buffer;

checking a sequence order of the traffic frame when the traffic frame is received by the SDU;

if the sequence order is not in a predetermined order, requesting re-transmission of the traffic frame from the PCF;

searching the temporary buffer of the PCF according to the re-transmission request; and

if the retransmission-requested traffic frame is in the temporary buffer, re-transmitting the traffic frame from the PCF to the SDU.

24. The method of claim 23, further comprising:

transmitting a frame for initializing a sequence number from the PCF to the SDU, if the retransmission-requested traffic frame does not exist in the temporary buffer.

25. The method of claim 24, wherein the frame for re-transmission request and the frame for initializing a sequence number each comprise:

an opposite-party call ID field indicative of a call ID of a side receiving the frame;

an indicator field indicative of frame type; and

a sequence-number field including a sequence number.

26. A method for managing data flow in a mobile communications system, comprising:

detecting that a traffic frame is received out of a predetermined order; and

transmitting a request for retransmission of the traffic frame, wherein traffic frame is transmitted by an SDU and received by a PCF.

27. The method of claim 26, wherein the detecting and transmitting steps are performed in the PCF.

28. The method of claim 27, further comprising:

receiving the retransmitted traffic frame in the PCF in response to the request.

29. The method of claim 26, wherein the detecting step is performed based on a sequence number included in the traffic frame.

30. A method for managing data flow in a mobile communications system, comprising:

receiving a request for retransmission of a traffic frame; and

retransmitting the traffic frame in response to said request, wherein the traffic frame is transmitted by an SDU and received by a PCF.

31. The method of claim 30, further comprising:

storing the traffic frame in a buffer.

32. The method of claim 31, wherein the retransmitting step includes:

searching the buffer to locate the traffic frame;

retransmitting the traffic frame from the SDU to the PCF if the traffic frame is located in the buffer.

33. The method of claim 31, wherein the retransmitting step includes:

searching the buffer to locate the traffic frame;

transmitting a reset frame for initializing a transmission sequence number if the traffic frame is not located in the buffer.

34. The method of claim 33, wherein the reset frame includes:

an opposite-party call ID field indicative of a call ID of a frame-receiving side;

an indicator field indicative of frame type; and

a sequence-number field.