Method And Device For Message Retransmission

• US 20120102216A1
• Filed: 03/23/2010
• Published: 04/26/2012
• Est. Priority Date: 06/17/2009
• Status: Active Grant

• Current Assignee: Pattington IP LLC (IP Edge LLC)
• Original Assignee: ZTE Corporation
• Inventors: Cui, Jinlong
• Granted Patent: US 8,825,891 B2
• Time in Patent Office: Days
• US Class Current: 709/232
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 69/326 in the transport layer [OSI layer 4] H04L69/16 takes precedence

Abstract

The present invention provides a method and device for message retransmission. The method comprises: constructing a first status report by a receiving terminal according to a message to be retransmitted, reading a message serial number of a truncated NACK which is truncated by an available bandwidth from the first status report, calculating a difference value between a front edge serial number of a receiving window of the receiving terminal and the message serial number of the truncated NACK, comparing the difference value with a given threshold, and taking a part before a truncation site as a second status report; constructing a third status report according to a comparison result and the second status report; sending the third status report by the receiving terminal; and retransmitting the message by a sending terminal according to the received third status report. The device for message retransmission is also provided, and comprises a threshold comparison module, a status report constructing module, a status report sending module and a retransmission module. By the method and device, it is achieved that under various status situations of the data transmission window, the air interface data transmission may be performed in time and the data transmission speed and efficiency are improved.

Claims

1. A method for message retransmission, comprising:

constructing a first status report by a receiving terminal according to a message to be retransmitted, reading a message serial number of a truncated non-acknowledgement (NACK) which is truncated by an available bandwidth from the first status report, calculating a difference value between a front edge serial number of a receiving window of the receiving terminal and the message serial number of the truncated NACK, comparing the difference value with a given threshold, and taking a part before a truncation site as a second status report;

constructing a third status report according to a comparison result and the second status report;

sending the third status report by the receiving terminal; and

retransmitting the message by a sending terminal according to the received third status report.

2. The method for message retransmission according to claim 1, wherein the step of constructing the third status report according to the comparison result and the second status report comprises:

if the difference value is less than the given threshold, abandoning the truncated NACK in the second status report to obtain the third status report.

3. The method for message retransmission according to claim 2, wherein the step of constructing the third status report according to the comparison result and the second status report comprises:

if the difference value is greater than the given threshold and the message serial number of the truncated NACK is equal to that of a previous NACK in the second status report, abandoning the truncated NACK in the second status report, and setting an end position of a retransmission segmentation interval of the previous NACK to be 0×

7FFF to obtain the third status report.

4. The method for message retransmission according to claim 3, wherein the step of constructing the third status report according to the comparison result and the second status report comprises:

if the difference value is greater than the given threshold and the message serial number of the truncated NACK is not equal to that of the previous NACK in the second status report, constructing the third status report according to a position of the truncation site.

5. The method for message retransmission according to claim 3, wherein the step of constructing the third status report according to the comparison result and the second status report comprises:

if the difference value is greater than the given threshold and the truncated NACK is a first NACK in the second status report, constructing the third status report according to is the position of the truncation site.

6. The method for message retransmission according to claim 4, wherein the step of constructing the third status report according to the position of the truncation site comprises:

if the truncation site is within an SO domain of the truncated NACK, abandoning the SO domain in the second status report to obtain the third status report.

7. The method for message retransmission according to claim 4, wherein the step of constructing the third status report according to the position of the truncation site comprises:

if the truncation site is not within an SO domain of the truncated NACK, abandoning the truncated NACK in the second status report to obtain the third status report.

11. The method for message retransmission according to claim 5, wherein the step of constructing the third status report according to the position of the truncation site comprises:

if the truncation site is within an SO domain of the truncated NACK, abandoning the SO domain in the second status report to obtain the third status report.

12. The method for message retransmission according to claim 5, wherein the step of constructing the third status report according to the position of the truncation site comprises:

if the truncation site is not within an SO domain of the truncated NACK, abandoning the truncated NACK in the second status report to obtain the third status report.

8. A device for message retransmission, comprising:

a threshold comparison module, for constructing a first status report according to a message to be retransmitted, reading a message serial number of a truncated non-acknowledgement (NACK) which is truncated by an available bandwidth from the first status report, calculating a difference value between a front edge serial number of a receiving window of a receiving terminal and the message serial number of the truncated NACK, comparing the difference value with a given threshold, and taking a part before a truncation site as a second status report;

a status report constructing module, for constructing a third status report according to a comparison result and the second status report;

a status report sending module, for sending the third status report; and

a retransmission module, for retransmitting the message according to the received third status report.

9. The device for message retransmission according to claim 8, wherein the status report constructing module comprises:

a determination unit, for determining a status of the message to be retransmitted according to the comparison result and a position relationship among the truncation site, the truncated NACK and the first status report; and

an adjustment unit, for adjusting the second status report according to the status of the message to be retransmitted to obtain the third status report.

10. The device for message retransmission according to claim 8, further comprising:

a message receiving module, for receiving the message from a sending terminal;

a message delivery module, for delivering the message; and

a status report triggering module, for triggering the first status report according to the message.

13. The device for message retransmission according to claim 9, further comprising:

a message receiving module, for receiving the message from a sending terminal;

a message delivery module, for delivering the message; and

a status report triggering module, for triggering the first status report according to the message.