METHOD FOR ENHANCING OF CONTROLLING RADIO RESOURCES, METHOD FOR TRANSMITTING STATUS REPORT, AND RECEIVER IN MOBILE COMMUNICATION SYSTEM

• US 20100136995A1
• Filed: 06/18/2008
• Published: 06/03/2010
• Est. Priority Date: 06/18/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck
• Granted Patent: US 8,964,652 B2
• Time in Patent Office: Days
• US Class Current: 455/452.100
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• 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 80/02 Data link layer protocols

Abstract

A method for improving radio resources, a method for transmitting a status report, and a receiving apparatus (receiver) in a mobile communication system are disclosed. In transmitting a status report by a receiving side RLC, although data that has not been received (missing PDU) is discovered, the receiving side does not immediately request its retransmission but transmits the status report after the lapse of a certain time (namely, a time point at which a timer expires), to thus reduce radio resources consumed for transmission of the status report.

Claims

1. A method for transmitting a status report in a mobile communication system, comprising:

(A) starting, by a receiving side, a timer at a lower edge of a reception window when the receiving side receives a PDU (Protocol Data Unit) from a sending side out of sequence,; and

(B) transmitting, by the receiving side, to the sending side, a status report including information about PDUs which have not been received until the expiration of the timer, if the timer expires in a state that a PDU corresponding to the lower edge of the reception window is not received.

2. The method of claim 1, wherein, in step (A), if the PDU is received from the sending side out of sequence and no timer is active, the timer is started.

3. The method of claim 1, further comprising:

stopping the timer, if the PDU corresponding to the lower edge of the reception window is received before the timer expires; and

delivering the received PDU and/or the following in-sequence PDU to an upper layer.

4. The method of claim 3, further comprising:

shifting, by the receiving side, the reception window such that the lower edge of the reception window corresponds to the first PDU which has not been received,

after the received PDU and/or the following in-sequence PDU are delivered to the upper layer;

checking whether there is any PDU stored in the shifted reception window; and

re-starting the timer with respect to the lower edge of the shifted reception window if there is a PDU stored in the reception window.

5. The method of claim 1, wherein the step (B) comprises:

re-starting the timer with respect to the lower edge of the reception window, after the status report is transmitted to the receiving side as the timer expires.

6. The method of claim 1, wherein the receiving side is a network, the receiving side is a terminal, and the steps (A) and (B) are performed by an RLC (Radio Link Control) entity of the terminal.

7. The method of claim 1, wherein the value of time period of the timer is determined by the sending side and transmitted to the receiving side.

8. An apparatus comprising:

a reception buffer that stores PDUs transmitted by a sending side;

a timer that operates during a pre-set time period if there is a PDU which has not been received at a lower edge of a reception window; and

a processing unit that sets the reception window, determines whether there is a PDU which has not been received among the PDUs that have been received by the reception window, by using SNs (Sequence Numbers) of the PDUs, and starts the timer for the lower edge of the reception window for which there exists the first PDU which has not been received.

9. The apparatus of claim 8, wherein if the corresponding PDU for which the timer was started has not been received at a time point when the timer expires, the processing unit transmits a status report including information about missing PDUs that have not been received at the time point when the timer expires, to the sending side.

10. The apparatus of claim 8, wherein the PDU that has not been received is a missing PDU.