Retransmission apparatus and method for high-speed data processing

• US 20070300120A1
• Filed: 05/10/2007
• Published: 12/27/2007
• Est. Priority Date: 05/10/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Hyun-Gu, Lee, Do-Young, Kim, Hye-Jeong
• Application Number:
  US11/801,571
• Publication Number:
  US 20070300120A1
• Time in Patent Office: Days
• US Class Current: 714/749
• CPC Class Codes: H04L 1/1851 using multiple timers

Abstract

A method for requesting retransmission of high-speed packet data in a receiving Automatic Retransmission reQuest (ARQ) entity of a mobile communication system that simultaneously performs Hybrid Automatic Retransmission reQuest (HARQ) and ARQ. The method includes, upon receipt of a packet, determining a sequence number of the received packet, and determining if there is at least one missing packet preceding the received packet; if there is at least one missing packet, driving a first timer which is set to a time required when a number of retransmission attempts reaches a predetermined maximum number of HARQ retransmissions, and monitoring receipt of the missing packet; and upon expiration of the timer, sending to a transmitting ARQ entity an Acknowledgement (ACK) including a last sequence number among sequence numbers of normally received consecutive ARQ packets.

Claims

1. A method for requesting a retransmission of high-speed packet data in a receiving Automatic Retransmission reQuest (ARQ) entity of a mobile communication system that simultaneously performs Hybrid Automatic Retransmission reQuest (HARQ) and ARQ, the method comprising:

upon receipt of a packet, determining a sequence number of the received packet, and determining if there is at least one missing packet preceding the received packet;

if there is at least one missing packet, driving a first timer which is set to a time required when a number of retransmission attempts reaches a predetermined maximum number of HARQ retransmissions, and monitoring receipt of the missing packet; and

upon expiration of the timer, sending to a transmitting ARQ entity an Acknowledgement (ACK) including a last sequence number among sequence numbers of normally received consecutive ARQ packets.

2. The method of claim 1, wherein the determining step comprises:

updating a current next sequence number VR(H) to a highest sequence number among sequence numbers of received packets; and

determining if there is at least one missing packet between the current VR(H) and a previous next sequence number VR(H) of a highest sequence number among sequence numbers of previously received packets.

3. The method of claim 1, further comprising:

after expiration of the timer, determining from the received packet if a next sequence number VR(R) of a highest sequence number among sequence numbers of consecutively received packets is updated;

resetting the timer when the VR(R) is updated; and

re-driving the first timer when the VR(R) is less than the previous VR(H).

4. The method of claim 1, further comprising:

upon sending the ACK, driving a second timer which is set to a time required when the receiving ARQ entity sends an ACK and then receives an ARQ packet retransmitted in response thereto, thereby monitoring receipt of a retransmitted ARQ packet; and

resending an ACK when VR(R) is not updated even after the second timer has expired.

5. The method of claim 1, wherein the step of monitoring receipt of the missing packet comprises:

when there more than two nonconsecutive missing packets, driving more than two first timers associated with the nonconsecutive missing packets.

6. The method of claim 5, wherein the sending of an ACK comprises:

when at least one of the first timers expires, determining if the expired first timer is a first timer of a packet corresponding to the VR(R); and

when the expired first timer is a first timer of a packet corresponding to the VR(R), sending to the transmitting ARQ entity an ACK including a last sequence number among sequence numbers of normally received consecutive ARQ packets.

7. The method of claim 4, wherein the step of monitoring receipt of a retransmitted ARQ packet comprises:

when there are more than two consecutive missing packets, driving more than two second timers associated with the consecutive missing packets.

8. The method of claim 1, further comprising:

after expiration of the first timer, determining if a number of missing ARQ packets is less than a predetermined reference; and

when the number of missing ARQ packets is less than the predetermined reference, sending an ACK to the transmitting ARQ entity.

9. The method of claim 8, wherein the step of determining whether an number of missing ARQ packets is less than a predetermined reference comprises:

determining whether a ratio of ARQ packets received between an VR(H) and an VR(R) exceeds a predetermined ACK transmission threshold.

10. The method of claim 8, further comprising:

counting the missing ARQ packets, and determining if the count value is greater than or equal to a predetermined reference; and

when the count value is greater than or equal to the predetermined reference, sending an ACK to the transmitting ARQ entity.

11. A method for requesting retransmission of high-speed packet data in a receiving Automatic Retransmission reQuest (ARQ) entity of a mobile communication system that simultaneously performs Hybrid Automatic Retransmission reQuest (HARQ) and ARQ, the method comprising:

upon receipt of a packet, determining if a number of missing ARQ packets is less than a predetermined reference; and

when the number of missing ARQ packets is less than the predetermined reference, sending an Acknowledgement (ACK) to a transmitting ARQ entity.

12. The method of claim 11, wherein the determining step comprises:

determining if a ratio of ARQ packets received between a variable VR(H) indicating a next sequence number of a highest sequence number among sequence numbers of received packets and a variable VR(R) indicating a next sequence number of a highest sequence number among sequence numbers of consecutively received packets exceeds a predetermined ACK transmission threshold.

13. The method of claim 11, further comprising:

counting the missing ARQ packets, and determining if the count value is greater than or equal to a predetermined reference; and

when the count value is greater than or equal to the predetermined reference, sending an ACK to the transmitting ARQ entity.

14. An apparatus for requesting retransmission of high-speed packet data in a mobile communication system that simultaneously performs Hybrid Automatic Retransmission reQuest (HARQ) and Automatic Retransmission reQuest (ARQ), the apparatus comprising:

an HARQ entity for reporting a Negative Acknowledgement (NACK) for a missing packet; and

a receiving ARQ entity for determining a sequence number of a received packet, driving a timer which is set to a time required when a number of retransmission attempts reaches a predetermined maximum number of HARQ retransmissions if there is at least one missing packet preceding the received packet, and upon expiration of the timer sending to a transmitting ARQ entity an Acknowledgement (ACK) including a last sequence number among sequence numbers of normally received consecutive ARQ packets.

15. An apparatus for requesting retransmission of high-speed packet data in a mobile communication system that simultaneously performs Hybrid Automatic Retransmission reQuest (HARQ) and Automatic Retransmission reQuest (ARQ), the apparatus comprising:

an HARQ entity for reporting a Negative Acknowledgement (NACK) for a missing ARQ packet; and

a receiving ARQ entity for calculating a ratio of missing ARQ packets by determining a next sequence number VR(R) of a highest sequence number among sequence numbers of consecutively received at least one ARQ packets, and sending an Acknowledgement (ACK) to a transmitting ARQ entity when the calculated ratio satisfies a condition for sending an ACK including a last sequence number among sequence numbers of normally received consecutive ARQ packets.