Data retransfer method, device and automatic retransfer request entity of transmission end
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF0 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more