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Data retransfer method, device and automatic retransfer request entity of transmission end

A technology of data retransmission and hybrid automatic retransmission, which is applied in the field of data retransmission technology to achieve the effect of increasing the probability of successful data retransmission

Inactive Publication Date: 2011-09-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above technical solution, when the layer-1 retransmission entity detects a NACK error or the layer-1 retransmission entity cannot transmit data packets correctly, the layer-1 entity will notify layer-2 to trigger layer-2 retransmission. However, if the channel quality does not improve significantly In this case, even if it is retransmitted again, it cannot essentially improve the probability that the data packet will be correctly transmitted during Layer 2 retransmission

Method used

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  • Data retransfer method, device and automatic retransfer request entity of transmission end
  • Data retransfer method, device and automatic retransfer request entity of transmission end
  • Data retransfer method, device and automatic retransfer request entity of transmission end

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The ARQ entity at the transmitting end and the ARQ entity at the receiving end are located at Layer 2, and the HARQ entity at the transmitting end and the HARQ entity at the receiving end are located at Layer 1, such as image 3 As shown, the specific data retransmission steps are as follows:

[0035] Step 301, the ARQ entity at the sending end of the layer two constructs the data transmitted by the upper layer into a PDU (packet data unit), and packs and numbers the PDU, sends it to the HARQ entity at the sending end, and starts the ARQ entity timer at the sending end;

[0036] Step 302, after receiving the PDU, the HARQ entity at the transmitting end sends it to the HARQ entity at the receiving end, and starts the HARQ entity timer at the transmitting end at the same time;

[0037] Step 303, after the receiving end HARQ entity receives the PDU, if the receiving end HARQ entity returns a NACK message, the transmitting end HARQ entity retransmits the PDU;

[0038] Step...

Embodiment 2

[0050] Such as Figure 4 As shown, the implementation process is basically the same as that of the first embodiment, wherein, steps 401 to 402 are the same as steps 301 to 302 in the first embodiment, and steps 407 to 412 are the same as steps 306 to 311 in the first embodiment , and will not be described again here.

[0051] The difference between the two examples is:

[0052]Step 403, the sending end HARQ entity receives the ACK message returned by the receiving end HARQ entity;

[0053] Step 404, the receiving end HARQ entity continues to send the PDU to the receiving end ARQ entity;

[0054] Step 405, the receiving end ARQ entity checks the received PDU, if the PDU check fails, then execute step 406;

[0055] Step 406, the receiving end ARQ entity directly returns a NACK message to the sending end ARQ entity;

[0056] Step 407: After receiving the NACK message, the sending end ARQ entity detects whether the air interface resources are sufficient, if the air interface r...

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PUM

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Abstract

The invention provides a method, a device for data retransmission and an automatic retransmission request entity for a sending end, wherein, the method for data retransmission comprises the follows steps that: when the automatic retransmission request ARQ entity for the sending end is acknowledged of the failure of data transmission, the automatic retransmission request ARQ entity for the sendingend detects an air interface resource; if the air interface resource is adequate, the automatic retransmission request ARQ entity for the sending end repacks and renumbers the data with unsuccessful transmission, and instructs a mixed automatic retransmission request HARQ entity for the sending end to adopt a modulation level lower than the present modulation level to retransmit data; the HARQ entity for the sending end retransmits the data according to the ARQ entity. With the invention, when the ARQ entity for the sending end detects that the HARQ entity for the sending end has unsuccessfuldata retransmission or data transmission, the ARQ entity for a sending end adopts to instruct the HARQ entity for the sending end to carry out data retransmission with a modulation level lower than the present modulation level, which increases the successful probability of data retransmission.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data retransmission technology. Background technique [0002] In UMTS (Universal Mobile Telecommunications Systems, Universal Mobile Telecommunications System) and LTE (Long Term Evolution, Long Term Evolution) systems, both the sending end and the receiving end support RLC (Radio Link Control, Radio Link Control) retransmission. [0003] However, whether it is a UMTS system or an LTE system, there is a possibility of data loss during layer one (ie physical layer) retransmission. In the 3GPP standard, a method for realizing data retransmission based on Layer 1 and Layer 2 (that is, the data link layer) exchange is proposed, such as figure 1 shown. [0004] The HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) entity is in Layer 1, and the ARQ (Automatic Repeat Request, Automatic Repeat Request) entity is in Layer 2. [0005] The sending e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L29/06
Inventor 包毅
Owner HUAWEI TECH CO LTD
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