Method for enhancing of controlling radio resources, method for transmitting status report, and receiver in mobile communication system

• US 8,964,652 B2
• Filed: 06/18/2008
• Issued: 02/24/2015
• 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
• Primary Examiner(s): Brandt, Christopher M
• Assistant Examiner(s): MANOHARAN, MUTHUSWAMY GANAPATHY
• Application Number:
  US12/452,140
• Publication Number:
  US 20100136995A1
• Time in Patent Office: 2,442 Days
• Field of Search: 370/229, 370/242, 370/349, 370/235, 370/412, 455/452.1
• US Class Current: 370/329
• 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:

detecting, at a receiving side, a missing PDU by detecting receipt of an out of sequence PDU from a sending side;

starting a timer and waiting to send a status report related to the detection until a time of expiration of the timer,

wherein the timer is started at a lower edge of a reception window, the lower edge of the reception window corresponding to the missing PDU;

storing received PDUs in a reception buffer during pendency of the timer;

determining if the missing PDU is received during the pendency of the timer; and

if, upon expiration of the timer, the missing PDU is not received, configuring the status report including information about the missing PDU and all other PDUs that have not been received during pendency of the timer, and

transmitting, by the receiving side, to the sending side, the status report; and

if the missing PDU is received during the pendency of the timer;

stopping the timer;

delivering the received PDU and any following in-sequence PDU(s) in the reception buffer to an upper layer;

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, wherein shifting occurs after the received PDU and any following in-sequence PDU(s) in the reception buffer are delivered to the upper layer;

checking whether there is any PDU stored in the reception buffer 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 in the shifted reception window.

2. The method of claim 1, wherein the sending side is a network, the receiving side is a terminal, and the method of claim 1 is performed by an RLC (Radio Link Control) entity of the terminal.

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

4. The method of claim 1, wherein upon detection of the missing PDU the receiving side does not immediately request retransmission of the missing PDU.

5. The method of claim 1, wherein determining if the missing PDU is received during the pendency of the timer is accomplished using Sequence Numbers (SNs) of received PDUs.

6. An apparatus comprising:

a reception buffer configured to store PDUs transmitted by a sending side;

a timer; and

a processing unit configured to;

detect, at a receiving side, a missing PDU by detecting receipt of an out-of-sequence PDU from the sending side;

start the timer and wait to send a status report related to the detection until a time of expiration of the timer, wherein the timer is started at a lower edge of a reception window, the lower edge of the reception window corresponding to the missing PDU;

store received PDUs in the reception buffer during pendency of the timer;

determine if the missing PDU is received during the pendency of the timer; and

if, upon expiration of the timer, the missing PDU is not received;

configure the status report including information about the missing PDU and all other PDUs that have not been received during pendency of the timer, and

transmit, by the receiving side, to the sending side, the status report; and

if the missing PDU is received during the pendency of the timer;

stop the timer;

deliver the received PDU and any following in-sequence PDU(s) in the reception buffer to an upper layer;

shift, 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, wherein shifting occurs after the received PDU and any following in-sequence PDU(s) in the reception buffer are delivered to the upper layer;

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

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