Method and apparatus for transmitting and receiving status report comprising received status of packet data in a mobile communication system

• US 20070091810A1
• Filed: 09/14/2006
• Published: 04/26/2007
• Est. Priority Date: 09/15/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Sung-Ho, Kim, Soeng-Hun, Song, O-Sok, Velde, Himke, Lieshout, Gert
• Granted Patent: US 8,634,400 B2
• Time in Patent Office: Days
• US Class Current: 370/236
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

Abstract

A method and terminal apparatus for transmitting a status report comprising a received status of packet data in a mobile communication system are provided, in which whether transmission of an implicit Negative Acknowledge (NACK) signal is required for requesting retransmission of at least one non-received data packet whose sequence number is unidentified is determined, if transmission of the implicit NACK signal is required, the implicit NACK signal including a sequence number of the last packet is generated among successfully received data packets, and a status report including the implicit NACK signal is transmitted to the transmitter, and if transmission of the implicit NACK signal is not required, a status report is transmitted to the transmitter including at least one of an ACK signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified.

Claims

1. A method for transmitting a status report comprising a received status of packet data in a mobile communication system, the method comprising:

determining, in the course of receiving data packets from a transmitter, whether transmission of an implicit Negative Acknowledge (NACK) signal is required for requesting retransmission of at least one non-received data packet whose sequence number is unidentified;

if transmission of the implicit NACK signal is required, generating the implicit NACK signal including a sequence number of a last packet among successfully received data packets, and transmitting a status report including the implicit NACK signal to the transmitter; and

if transmission of the implicit NACK signal is not required, transmitting to the transmitter a status report including at least one of an ACK signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified.

2. The method of claim 1, wherein the implicit NACK signal comprises:

a type field comprising a unique type value distinguishable from the explicit NACK signal for requesting retransmission of a non-received data packet whose sequence number is identified; and

a sequence number field including a sequence number of the last packet.

3. The method of claim 1, wherein the determining of whether transmission of an implicit NACK signal is required comprises:

determining whether data sets including data packets that are not reassembled in a packet for an upper layer after being received from the transmitter comprises a data set not including the last data packet; and

if the data sets comprise the data set not including the last data packet, determining whether the data packet comprises a non-received data packet whose sequence number is unidentified.

4. The method of claim 3, wherein the data sets includes data packets segmented from one original data packet.

5. The method of claim 3, wherein status reports are transmitted when at least one of a status report occurrence time based on a reference period has arrived and an indication for transmission of the status report is received from the transmitter.

6. The method of claim 1, wherein the determining of whether transmission of an implicit NACK signal is required comprises determining whether transmitting the implicit NACK signal to a radio network controller (RNC) that controls radio resources of a terminal is required, when the terminal receiving the data packets moves from a source cell to a target cell due to handover.

7. The method of claim 6, wherein the implicit NACK signal is transmitted when at least one of a start of the handover and after completion of the handover has occurred.

8. A method for receiving a status report comprising a received status of packet data in a mobile communication system, the method comprising:

transmitting data packets to a receiver;

receiving, from the receiver, a status report comprising a received status of the transmitted data packets;

determining whether the status report comprises an implicit Negative Acknowledge (NACK) signal including a sequence number of the last packet among the successfully received data packets, in order to request retransmission of a non-received data packet whose sequence number is unidentified;

if the status report comprises the implicit NACK signal, transmitting data packets following the last packet indicated by the implicit NACK signal to the receiver; and

if the status report does not comprise the implicit NACK signal, detecting from the status report at least one of an Acknowledge (ACK) signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified, and retransmitting the non-received data packet whose sequence number is identified, indicated by the explicit NACK signal.

9. The method of claim 8, wherein the implicit NACK signal comprises:

a type field comprising a unique type value distinguishable from the explicit NACK signal for requesting retransmission of a non-received data packet whose sequence number is identified; and

a sequence number field including a sequence number of the last packet.

10. The method of claim 8, wherein the transmitting of the data packets comprises transmitting, to the receiver, data packets following the last packet in a data set which belongs to the last packet indicated by the implicit NACK signal.

11. The method of claim 10, wherein the data set includes data packets segmented from one original data packet.

12. The method of claim 8, wherein the status report is received when at least one of a status report occurrence time based on a reference period has arrived, and an indication for transmission of the status report is received from the receiver.

13. The method of claim 8, wherein the status report is received when a terminal receiving the data packets moves from a source cell to a target cell due to handover.

14. An apparatus for transmitting a status report comprising a received status of packet data in a mobile communication system, the apparatus comprising:

a data receiver for receiving data packets from a transmitter and storing the received data packets; and

a controller for determining, in the course of receiving the data packets, whether transmission of an implicit Negative Acknowledge (NACK) signal is required for requesting retransmission of a non-received data packet whose sequence number is unidentified,

if transmission of the implicit NACK signal is required, generating a status report including an implicit NACK signal comprising a sequence number of the last packet among successfully received data packets,

if transmission of the implicit NACK signal is not required, generating a status report including at least one of an ACK signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified, and

transmitting the status reports to the transmitter.

15. The apparatus of claim 14, wherein the implicit NACK signal comprises:

a type field comprising a unique type value distinguishable from the explicit NACK signal for requesting retransmission of a non-received data packet whose sequence number is identified; and

a sequence number field including a sequence number of the last packet.

16. The apparatus of claim 14, wherein the controller is programmable to:

determines whether data sets including data packets that are not reassembled in a packet for an upper layer after being received from the transmitter comprise a data set not including the last data packet; and

if the data sets comprise the data set not including the last data packet, determine whether the data packet comprises a non-received data packet whose sequence number is unidentified.

17. The apparatus of claim 16, wherein the data sets includes data packets segmented from one original data packet.

18. The apparatus of claim 14, wherein the status reports are transmitted when at least one of a status report occurrence time based on a reference period has arrived and an indication for transmission of the status report is received from the transmitter.

19. The apparatus of claim 14, wherein the controller determines whether transmitting the implicit NACK signal to a radio network controller (RNC) that controls radio resources of a terminal is required, when the terminal receiving the data packets moves from a source cell to a target cell due to handover.

20. The apparatus of claim 19, wherein the transmission of the implicit NACK signal is transmitted when at least one of a start of the handover and after completion of the handover has occurred.

21. An apparatus for receiving a status report comprising a received status of packet data in a mobile communication system, the apparatus comprising:

a data transmitter for transmitting data packets to a receiver; and

a controller for receiving, from the receiver, a status report comprising a received status of the transmitted data packets;

if the status report comprises an implicit Negative Acknowledge (NACK) signal including a sequence number of the last packet among the successfully received data packets, in order to request retransmission of a non-received data packet whose sequence number is unidentified, controlling the data transmitter to transmit data packets following the last packet indicated by the implicit NACK signal to the receiver; and

if the status report does not comprise the implicit NACK signal, detecting from the status report at least one of an Acknowledge (ACK) signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified, and controlling the data transmitter to retransmit the non-received data packet whose sequence number is identified, indicated by the explicit NACK signal.

22. The apparatus of claim 21, wherein the implicit NACK signal comprises:

a type field comprising a unique type value distinguishable from the explicit NACK signal for requesting retransmission of a non-received data packet whose sequence number is identified; and

a sequence number field including a sequence number of the last packet.

23. The apparatus of claim 21, wherein the controller controls the data transmitter to transmit, to the receiver, data packets following the last packet in a data set which belongs to the last packet indicated by the implicit NACK signal.

24. The apparatus of claim 23, wherein the data set includes data packets segmented from one original data packet.

25. The apparatus of claim 21, wherein the status report is received when at least one of a status report occurrence time based on a reference period has arrived and an indication for transmission of the status report is received from the receiver.

26. The apparatus of claim 21, wherein the status report is received when a terminal receiving the data packets moves from a source cell to a target cell due to handover.

27. A method for transmitting a status report comprising a received status of packet data in a terminal of a mobile communication system, the method comprising:

moving, by the terminal receiving data packets, from a source cell to a target cell due to handover;

after moving to the target cell, waiting until a data packet is first received from the target cell; and

upon receipt of the data packet, transmitting a status report comprising a received status of the terminal to a radio network controller (RNC) that controls radio resources of the terminal.

28. The method of claim 27, wherein the status report includes at least one of an Acknowledge (ACK) signal comprising a sequence number of a data packet successfully received at the terminal and an explicit Negative Acknowledge (NACK) signal comprising a sequence number of a non-received data packet whose sequence number is identified.

29. The method of claim 27, further comprising:

after moving to the target cell, starting a timer set to a reference time; and

if the data packet is not received from the target cell until the timer expires, transmitting the status report to the RNC.

30. The method of claim 27, further comprising:

upon receipt of the data packet, determining whether the received data packet is a retransmitted data packet; and

if the received data packet is a retransmitted data packet, waiting until the next data packet is received from the target cell without transmitting the status report.

31. A terminal apparatus for transmitting a status report comprising a received status of packet data in a mobile communication system, the apparatus comprising:

a data receiver for receiving a series of data packets from a network and storing the received data packets; and

a controller for, if the terminal moves from a source cell to a target cell due to handover, waiting until a data packet is first received from the target cell, and upon receipt of the data packet, transmitting a status report comprising a received status of the terminal to a radio network controller (RNC) that controls radio resources of the terminal.

32. The apparatus of claim 31, wherein the status report includes at least one of an Acknowledge (ACK) signal comprising a sequence number of a data packet successfully received at the terminal and an explicit Negative Acknowledge (NACK) signal comprising a sequence number of a non-received data packet whose sequence number is identified.

33. The apparatus of claim 31, wherein after the terminal moves to the target cell, the controller starts a timer set to a reference time, and transmits the status report to the RNC, if the data packet is not received from the target cell until the timer expires.

34. The apparatus of claim 31, wherein the controller is programmable to:

upon receipt of the data packet, determine whether the received data packet is a retransmitted data packet; and

if the received data packet is a retransmitted data packet, wait until the next data packet is received from the target cell without transmitting the status report.

35. A computer-readable recording medium storing a computer program code for performing a method for transmitting a status report comprising a received status of packet data in a mobile communication system, the method comprising:

determining, in the course of receiving data packets from a transmitter, whether transmission of an implicit Negative Acknowledge (NACK) signal is required for requesting retransmission of at least one non-received data packet whose sequence number is unidentified;

if transmission of the implicit NACK signal is required, generating the implicit NACK signal including a sequence number of a last packet among successfully received data packets, and transmitting a status report including the implicit NACK signal to the transmitter; and

if transmission of the implicit NACK signal is not required, transmitting to the transmitter a status report including at least one of an ACK signal comprising a sequence number of a successfully received data packet and an explicit NACK signal comprising a sequence number of a non-received data packet whose sequence number is identified.

36. The method of claim 35, wherein the implicit NACK signal comprises:

a type field comprising a unique type value distinguishable from the explicit NACK signal for requesting retransmission of a non-received data packet whose sequence number is identified; and

a sequence number field including a sequence number of the last packet.

37. The method of claim 35, wherein the determining of whether transmission of an implicit NACK signal is required comprises:

determining whether data sets including data packets that are not reassembled in a packet for an upper layer after being received from the transmitter comprises a data set not including the last data packet; and

if the data sets comprise the data set not including the last data packet, determining whether the data packet comprises a non-received data packet whose sequence number is unidentified.

38. The method of claim 37, wherein the data sets includes data packets segmented from one original data packet.

39. The method of claim 38, wherein status reports are transmitted when at least one of a status report occurrence time based on a reference period has arrived and an indication for transmission of the status report is received from the transmitter.

40. The method of claim 35, wherein the determining of whether transmission of an implicit NACK signal is required comprises determining whether transmitting the implicit NACK signal to a radio network controller (RNC) that controls radio resources of a terminal is required, when the terminal receiving the data packets moves from a source cell to a target cell due to handover.

41. The method of claim 40, wherein the implicit NACK signal is transmitted when at least one of a start of the handover and after completion of the handover has occurred.