Method and a device for improved retransmissions

• US 9,172,508 B2
• Filed: 05/24/2013
• Issued: 10/27/2015
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Timner, Ylva, Axelsson, Hkan
• Primary Examiner(s): Merant, Guerrier
• Application Number:
  US13/902,549
• Publication Number:
  US 20130262950A1
• Time in Patent Office: 886 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/0709 in a distributed system consisting of a plurality of standalone computer nodes, e.g. clusters, client-server systems
• CPC Class Codes: G06F 11/0751 Error or fault detection not based on redundancy power supply failures G06F1/30; network fault management H04L41/06
• CPC Class Codes: G06F 11/079 Root cause analysis, i.e. error or fault diagnosis in a hardware test environment G06F11/22; in a software test environment G06F11/36
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end

Abstract

The invention discloses a method for use in a cellular system with an RBS which controls traffic to and from a cell, with one User Equipment, UE, in the cell. The RBS and the UE receive and transmit information between each other, one of them being a sending party and the other one is a receiving party, and errors in messages which are received can be detected by the receiving party by a first error detection method and if errors are detected in received messages, the receiving party can request a retransmission from the transmitting party. The receiving party stores the order in which retransmissions are requested, so that erroneous retransmissions may be detected by the receiving party without the first error detection method.

Claims

1. A method, performed at a receiving device, for detecting erroneous retransmissions of messages, the method comprising:

detecting errors in messages received from a sending device, wherein the messages include retransmitted messages;

requesting the sending device to retransmit the messages in which errors are detected, and recording a retransmission order in which retransmissions of the messages are requested, wherein the retransmission order is updated to add entries corresponding to messages whose retransmissions are detected to be erroneous and messages whose transmissions are detected to be erroneous; and

detecting erroneous retransmissions of messages based on whether the retransmitted messages are received from the sending device in the recorded retransmission order and without aid of a retransmission timer.

2. The method of claim 1 wherein the specified retransmission order comprises a non-sequential order of messages in which the errors were detected.

3. The method of claim 1 further comprising storing the specified retransmission order at the receiving device.

4. The method of claim 1 wherein detecting erroneous retransmissions of messages based on whether the retransmitted messages are received from the sending device in the specified retransmission order and without aid of a retransmission timer comprises detecting a retransmitted message as being erroneous if the retransmitted message is not received in the specified retransmission order.

5. The method of claim 1 further comprising detecting the erroneous retransmissions of retransmitted messages in accordance with a priority assigned to the retransmitted messages by the sending device.

6. The method of claim 5 wherein the specified retransmission order indicates that the sending device is to retransmit a second message before the sending device retransmits a first message, and wherein detecting the erroneous retransmissions of retransmitted messages in accordance with the assigned priority comprises:

receiving the retransmissions of the first and second messages from the sending device wherein the first message has been assigned a priority that is higher than a priority of the second message;

receiving a third message from the sending device, wherein the third message is not a retransmitted message and has been assigned a priority by the sending device that is lower than the first and second messages; and

detecting an erroneous retransmission of the second message if the first message is not received in the specified retransmission order, and if the third message is received before the second retransmitted message is correctly received.

7. The method of claim 6 further comprising delaying sending a retransmission request to the sending device for the first message until determining whether the second message was erroneously received.

8. The method of claim 1 wherein requesting the sending device to retransmit the messages in which errors are detected in a specified retransmission order comprises requesting a retransmission of a message each time an error is detected.

9. A receiving device for detecting erroneous retransmissions of messages transmitted by a sending device via a communications network, the receiving device configured to:

detect errors in the messages received from the sending device, wherein the messages include retransmitted messages;

request the sending device to retransmit the messages in which errors are detected, and recording a retransmission order in which retransmissions of the messages are requested, wherein the retransmission order is updated to add entries corresponding to messages whose retransmissions are detected to be erroneous and messages whose transmissions are detected to be erroneous; and

detect erroneous retransmissions of messages based on whether the retransmitted messages are received from the sending device in the recorded retransmission order and without aid of a retransmission timer.

10. The receiving device of claim 9 wherein the specified retransmission order comprises a non-sequential order of messages in which the errors were detected.

11. The receiving device of claim 9 wherein the receiving device is further configured to store the specified retransmission order.

12. The receiving device of claim 9 wherein the receiving device is further configured to detect a retransmitted message as being an erroneously retransmitted message if the retransmitted message is not received in the specified retransmission order.

13. The receiving device of claim 9 wherein the receiving device is further configured to detect the erroneous retransmissions of retransmitted messages in accordance with a priority assigned to the retransmitted messages by the sending device.

14. The receiving device of claim 13 wherein the specified retransmission order indicates that the sending device is to retransmit a second message before the sending device retransmits a first message, and wherein to detect the erroneous retransmissions of retransmitted messages in accordance with the assigned priority, the receiving device is further configured to:

receive the retransmissions of the first and second messages from the sending device wherein the first message has been assigned a priority that is higher than a priority of the second message;

receive a third message from the sending device, wherein the third message is not a retransmitted message and has been assigned a priority by the sending device that is lower than the first and second messages; and

detect an erroneous retransmission of the second message if the first message is not received in the specified retransmission order, and if the third message is received before the second retransmitted message is correctly received.

15. The receiving device of claim 14 wherein the receiving device is further configured to send a retransmission request to the sending device for the first message until it is determined whether the second message was erroneously received.

16. The receiving device of claim 9 wherein the receiving device is configured to request a retransmission of a message each time an error is detected.

17. The receiving device of claim 9 wherein the receiving device comprises one of a radio base station (RBS) communicating with a User Equipment (UE), and wherein the sending device comprises the other of the RBS and the UE.

18. A method, performed at a receiving device, for detecting erroneous retransmissions of messages, the method comprising:

detecting errors in messages received from a sending device, wherein the messages include retransmitted messages;

requesting the sending device to retransmit the messages in which errors are detected, and recording a retransmission order in which retransmissions of the messages are requested, wherein the retransmission order is updated to add entries corresponding to messages whose retransmissions are detected to be erroneous and messages whose transmissions are detected to be erroneous; and

detecting erroneous retransmissions of messages if the retransmitted messages are not received in the recorded retransmission order.

19. A Radio Base Station (RBS) for use in a cellular access system, for controlling of traffic to and from a cell in the system, in which cell there can be at least one User Equipment (UE) in the cell, the RBS configured to:

detect errors in messages received from the UE, wherein the messages include retransmitted messages;

request the UE to retransmit the messages in which errors are detected, and recording a retransmission order in which retransmissions of the messages are requested, wherein the retransmission order is updated to add entries corresponding to messages whose retransmissions are detected to be erroneous and messages whose transmissions are detected to be erroneous; and

detect erroneous retransmissions of messages if the retransmitted messages are not received in the recorded retransmission order.

20. A User Equipment (UE) for use in a cellular access system that includes a Radio Base Station (RBS) for the control of traffic to and from a cell in the system in which cell the UE can be used, the UE is configured to:

detect errors in messages received from the RBS, wherein the messages include retransmitted messages;

request the RBS to retransmit the messages in which errors are detected, and record a retransmission order in which retransmissions of the messages are requested, wherein the retransmission order is updated to add entries corresponding to messages whose retransmissions are detected to be erroneous and messages whose transmissions are detected to be erroneous; and

detect erroneous retransmissions of messages if the retransmitted messages are not received in the recorded retransmission order.