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An AM mode state feedback method and system

A state feedback, AM mode technology, applied in the field of communication, can solve the problems of data packets not arriving in sequence, different transmission delays of data packets, reducing effective throughput, etc., to avoid unnecessary retransmissions and receive accurate state feedback , the effect of improving the effective throughput

Inactive Publication Date: 2008-07-09
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the Long-Term Evolution project (LTE, Long Time Evolution), the Hybrid Automatic Repeat Request (HARQ, Hybrid Automatic Repeat Request) of the Medium Access Control (MAC, Medium Access Control) layer also has the function of error detection and retransmission , so that the data packets transmitted in different HARQ processes may have different transmission delays. From the perspective of the RLC layer, there will be cases where the data packets from the sender to the receiver do not arrive in order
When the status report process is triggered, because the gap in the packet receiving sequence may only be caused by the long transmission delay of a certain HARQ process, rather than the real packet loss, if the correctly received packet is sent directly according to the existing mechanism The acknowledgment information and the detected gap information of the packet receiving sequence are used to ACK and NACK the data packet, which will cause unnecessary retransmission at the sender, which wastes system resources and reduces the effective throughput.

Method used

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  • An AM mode state feedback method and system
  • An AM mode state feedback method and system
  • An AM mode state feedback method and system

Examples

Experimental program
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specific Embodiment 1

[0067] Such as image 3 As shown, it is a flowchart of an embodiment of starting the timer for preventing HARQ jitter at the receiving end. The flow of the status report method based on the anti-shake timer at the receiving end is as follows:

[0068] 1. When the trigger condition of the status report is initially satisfied, the acknowledgment information of the correctly received data packets is sent. If there is a gap in the receiving sequence and the timer is not started, the timer for preventing HARQ jitter is started for these gap data packets. The timer length is equal to the maximum HARQ transmission delay that may exist, which is determined by the maximum number of HARQ retransmissions and the round trip time (RTT, Round TripTime) of each transmission;

[0069] 2. The sender receives the confirmation status report, processes the confirmed data packets, clears the cache, resets the information, etc.;

[0070] 3. When the timer expires, within the scope of the original...

specific Embodiment 2

[0076] Such as Figure 4 As shown, it is a flowchart of an embodiment of starting the anti-shaking timer at the sending end. The flow of the status reporting method based on the timer that the transmitter starts to prevent HARQ jitter is as follows:

[0077] 1. When the status report trigger condition is initially satisfied, the receiving end will feed back the detailed receiving status to the sending end through a status report, and the gap in the receiving sequence will be represented by unconfirmed information;

[0078] 2. The sender receives the status report, processes the confirmed data packets, clears the cache, resets information, etc., and if there is a gap in the receiving sequence, starts the corresponding timer to prevent HARQ jitter;

[0079] 3. When the timer expires and the data packets at these gaps still have not received confirmation information correctly, the sender directly initiates the retransmission process of these data packets;

[0080] 4. The receiv...

specific Embodiment 3

[0085] Such as Figure 5 As shown in FIG. 2 , it is a flow chart of an embodiment of sending a status report in a unified manner. After waiting for the corresponding HARQ jitter prevention timer to expire, the receiving end sends a unified status report to confirm the correct reception of the data packet and the feedback information of packet loss. The method flow is as follows:

[0086] 1. When the status report trigger condition is initially met, record the current latest data block label, if there is a gap in the receiving sequence and the timer is not started, start the timer for preventing HARQ jitter for these gap data packets;

[0087] 2. Within the timer time, if all the data packets at the gaps are received correctly, a confirmation message of correct reception will be sent to the sender; otherwise, after the timer expires, if there are still data packets not received correctly, it will be considered as packet loss and will be sent to the sender. All the confirmed r...

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Abstract

The invention provides a status feedback method of an AM mode, which is used for determining whether received data packages are received in a correct order, and if a receiving sequence nick exists, the method finishes the final feedback of receiving status after further detecting the receiving sequence nick. The invention simultaneously provides a status feedback system of the AM mode, which comprises a sending end and a receiving end, and the receiving end comprises a decision unit and a detection unit; wherein, the decision unit is used for determining whether the received data packages are received in a correct order and triggering the detection unit if a receiving sequence nick exists; the detection unit is used for detecting the receiving sequence nick and finishing the final feedback of receiving status. The invention can lead the receiving status feedback of RLC to be more accurate, avoid unnecessary retransmission and consequently save system cost.

Description

technical field [0001] The invention relates to the communication field, in particular to an AM mode state feedback method and system. Background technique [0002] Radio Link Control (RLC, Radio Link Control) layer acknowledgment mode (AM, Acknowledged Mode) is to improve the correct probability of data transmission through the state feedback mechanism of the receiving end and the retransmission mechanism of the sending end. [0003] For the status feedback requirements of the AM mode of the RLC layer, a typical method in the existing system is described as follows: [0004] Such as figure 1 As shown, the receiving end notifies the sending end of the successful reception of data or requests retransmission of lost data by sending one or more status report packets; the sending end receives the status report and releases the cache occupied by the data packets that have been confirmed to be successfully received. Or perform necessary retransmission of the data requested for r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16
Inventor 刘佳敏毕海洲高卓
Owner CHINA ACAD OF TELECOMM TECH
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