Data transmission method and data retransmission method
A method which can reduce loss in data transmission is provided. A data block is prepared in a high-level layer and the data block is transmitted in a low-level layer. Status report information associated with reception or non-reception of the data block is received through the low-level layer. When a receiver fails to receive data transmitted from a transmitter, the transmitter can rapidly recognize the reception failure and can retransmit the data.
1. A method of providing a status report of a Radio Link Control (RLC) layer in a wireless communication system, the method performed by a receiver and comprising:
starting a timer when at least one missed RLC Protocol Data Unit (PDU) is detected;
stopping the timer when the at least one missed RLC PDU is received from a transmitter while the timer is running;
triggering the status report when the timer expires; and
transmitting the status report to the transmitter, wherein the status report comprises a positive acknowledgement and a negative acknowledgement, the positive acknowledgement corresponding to an RLC PDU having a highest sequence number (SN) among successfully received RLC PDUs, and the negative acknowledgement indicating the at least one missed RLC PDU.
2. The method of claim 1 , wherein the positive acknowledgement includes a SN following the SN of the successfully received RLC PDU.
3. The method of claim 1 , wherein the negative acknowledgement comprises a SN of the at least one missed RLC PDU.
4. The method of claim 1 , wherein the status report is constructed according to a total size of RLC PDUs indicated by a Medium Access Control (MAC) layer.
5. The method of claim 1 , wherein the least one missed RLC PDU is detected when a SN following a SN of the RLC PDU with the highest SN among the successfully received RLC PDUs is larger than a SN following a last in-sequence received RLC PDU.
6. The method of claim 1 , wherein the timer is stopped when a SN following the SN of the RLC PDU with the highest SN among the successfully received RLC PDUs when the timer was started is the same as a SN following a last in-sequence received RLC PDU.
7. A receiver comprising a Radio Link Control (RLC) entity for providing a status report to a RLC entity of a transmitter, wherein the RLC entity of the receiver is configured to:
start a timer when at least one missed RLC Protocol Data Unit (PDU) is detected;
stop the timer when the at least one missed RLC PDU is received from the transmitter while the timer is running;
trigger the status report when the timer expires; and
transmit the status report to the transmitter, wherein the status report comprises a positive acknowledgement and a negative acknowledgement, the positive acknowledgement corresponding to an RLC PDU having a highest sequence number (SN) among successfully received RLC PDUs, and the negative acknowledgement indicating the at least one missed RLC PDU.
8. The receiver of claim 7 , wherein the positive acknowledgement includes a SN following the SN of a successfully received RLC PDU.
9. The receiver of claim 7 , wherein the negative acknowledgement comprises a SN of the at least one missed RLC PDU.
10. The receiver of claim 7 , wherein the status report is constructed according to a total size of RLC PDUs indicated by a Medium Access Control (MAC) layer.
11. The receiver of claim 7 , wherein the least one missed RLC PDU is detected when a SN following a SN of the RLC PDU with the highest SN among the successfully received RLC PDUs is larger than a SN following a last in-sequence received RLC PDU.
12. The receiver of claim 7 , wherein the timer is stopped when a SN following a SN of the RLC PDU with the highest SN among the successfully received RLC PDUs when the timer was started is the same as a SN following a last in-sequence received RLC PDU.