WO2011110124A2

WO2011110124A2 - Data transmission method and device

Info

Publication number: WO2011110124A2
Application number: PCT/CN2011/073179
Authority: WO
Inventors: 董雪峰
Original assignee: 华为技术有限公司
Priority date: 2011-04-22
Filing date: 2011-04-22
Publication date: 2011-09-15
Also published as: CN102845013B; CN102845013A; WO2011110124A3

Abstract

A data transmission method and device are provided. The method includes the following steps: firstly, performing the transmission evaluation on a packet and obtaining an evaluation result; then, preliminarily determining the length of the packet to be transmitted on the basis of the evaluation result, and then adjusting the length of the packet to be transmitted on the basis of the current retransmission rate; finally, transmitting the packet with the adjusted length of the packet. With the data transmission method and device provided by the embodiments of the present invention, for obtaining the optimum packet transmission length, the retransmission rate is brought into the transmission evaluation content and the length of the packet is adjusted on the basis of the retransmission rate, thus the retransmission rate is reduced and the throughput of the effective data is improved under some certain circumstances.

Description

Data transmission method and device

The present invention relates to the field of communications technologies, and in particular, to a data transmission data transmission method and apparatus. Background technique

In the user equipment (UE) side data transmission mechanism of the existing network communication, the length of the uplink data packet sent by the user equipment to the network side is mainly determined according to the evaluation content of the available transmission format set, the available transmission power, and the effective data size of the buffer. . During data transmission, selecting the appropriate packet length can improve the success rate of data transmission. Especially in some specific scenarios, such as in the case of poor signal quality, the optimized packet length can significantly reduce the retransmission of data transmission. Rate, while increasing the throughput of effective data in the communication system.

However, in the transmission mechanism of the existing user equipment, only the factors of the available transmission format set, the available transmission power, and the effective data size of the buffer are considered to select the length of the transmission data packet, and environmental factors are not considered, that is, there is no The optimal transmission data length for different application scenarios is selected according to one or more factors reflecting different application scenarios. According to the existing transmission mechanism, when the user equipment is in a specific scenario where the signal quality is poor and the retransmission rate is high, it is difficult to obtain the optimized length of the transmission data packet through the existing evaluation method, so that the data packet needs to be retransmitted multiple times. Can be successful, resulting in low effective data throughput. Summary of the invention

The embodiment of the invention provides a data transmission data transmission method and device to solve the problem that the effective data throughput rate is not high in some specific scenarios.

An embodiment of the present invention provides a data transmission method, where the method first sends a data packet to evaluate and obtain an evaluation result, and then determines a length of the to-be-sent data packet according to the evaluation result. Degree, and then adjust the length of the data packet to be sent according to the current retransmission rate; finally, the data packet is sent with the adjusted data packet length.

A terminal, the terminal includes an evaluation module, a transmission processing module, and a sending module, wherein the evaluation module sends an evaluation result to the sending data packet; the sending processing module determines the initial result according to the evaluation result. The length of the data packet to be sent, and then adjusting the length of the data packet to be sent according to the current retransmission rate; finally, the sending module sends the data packet transmission with the adjusted data packet length.

A data transmission device, the device includes an evaluation module, a transmission processing module, and a transmission module, wherein the evaluation module sends an evaluation result to be sent by the evaluation module; the sending processing module is configured according to the evaluation result The initial length determines the length of the data packet to be sent, and then adjusts the length of the data packet to be sent according to the current retransmission rate. Finally, the sending module sends the data packet transmission with the adjusted data packet length.

The data transmission method, the terminal, and the device provided by the embodiment of the present invention include the retransmission rate into the evaluation content, and adjust the length of the data packet according to the retransmission rate to obtain an optimized packet transmission length, thereby being specific. In the scenario, reduce the retransmission rate and increase the throughput of valid data.

DRAWINGS

1 is a flow chart showing a data transmission method according to an embodiment of the present invention:

FIG. 2 is a flowchart of a data transmission method according to an embodiment of the present invention.

FIG. 3 is a partial flow diagram of a data transmission method according to an embodiment of the present invention;

4 is a partial flow of a data transmission method according to an embodiment of the present invention;

FIG. 5 shows a specific embodiment of a terminal or a data transmission device according to an embodiment of the present invention.

The technical solution in the embodiment of the present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention. The invention is described in a clear and complete manner, and it is obvious that the described embodiments are only a part of the embodiments of the invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of the present invention.

An embodiment of the present invention provides a data transmission method, which enables a user equipment to be included in a specific scenario to perform transmission condition evaluation in a specific scenario where a poor signal quality leads to a high retransmission rate, to obtain an optimal data packet transmission length. , thereby reducing the packet retransmission rate and increasing the effective data throughput of effective data.

As shown in FIG. 1 and FIG. 2, a data transmission method provided by an embodiment of the present invention includes the following steps:

Step 101: Send a data packet to evaluate and obtain an evaluation result;

Step 102: Determine, according to the evaluation result, a length of the data packet, and further adjust a length of the data packet according to a current retransmission rate;

Step 103: Send the data packet.

The conditions for transmitting the evaluation of the data packet to be sent by the user equipment in the foregoing step 101 include three other conditions, namely, a set of available transport formats, available transmit power, and valid data size of the buffer. The three evaluation contents are only related to the user equipment's own situation, and are independent of specific external scene factors such as signal quality. Therefore, in different external scenarios, the size of the transmitted data packet is mainly determined by the retransmission rate, because the retransmission rate is mainly Depends on external factors such as signal quality.

Referring to FIG. 3 together, in step 101, the actions of transmitting the evaluation of the data packet and obtaining the evaluation result include:

Step 201: Detect a size of valid data to be sent that exists in a buffer of the user equipment. Step 202: Calculate a currently available transmission capability according to available transmit power.

Step 203: Acquire an evaluation result, where the evaluation result is a transmission format list that satisfies the transmission power and the transmission capability in the available transmission format set.

The calculation of the currently available transmission capability according to the available transmit power refers to obtaining the maximum transmission capability that can be implemented by the user equipment according to the calculation of the transmit power of the user equipment. The larger the transmission capacity of the backup, the better the transmission of larger data packets.

The above describes the transmission format that satisfies the transmission power and the transmission capability in the available transmission format of the user equipment, forms a list of available transmission formats, and arranges the transmission formats in the list in a certain order. The certain order refers to the size of the corresponding transmission data packet when each transmission format is used, and is arranged in order from small to large, and each transmission format in the column corresponds to one transmission gear position. In the process of transmitting data to the network side by the user equipment, adjusting the size of the transport data packet is mainly achieved by adjusting the available transport format. Correspondingly, changing the transport format upwards increases the data length of the transport data packet at the same time. One file, on the other hand, replacing a transmission format downwards means that the data length of the transmitted data packet is lowered by one file.

In step 102, determining the size of the data packet according to the initial result of the evaluation refers to the transmission format and length of the initially selected data packet in the transmission format list that satisfies the transmission power and the transmission capability according to the size of the valid data to be transmitted. Then, combined with the retransmission rate, the transmission length of the data packet is further adjusted to increase the transmission success rate, reduce the retransmission rate, and improve the throughput of the network system.

Please refer to FIG. 4 together, and the foregoing actions for adjusting the length of the data packet specifically include:

Step 301: Calculate a current retransmission rate;

Step 302: Compare the current retransmission rate with a preset upper threshold and a lower threshold;

Step 303: If the retransmission rate is less than the uppering threshold according to the comparison result, the transmission format is changed upward to increase the transmission length of the data packet, and if the retransmission rate is greater than the lowering threshold, the transmission format is changed downward to enable the data packet to be transmitted. The length corresponds to decrease.

In the above step 301, the current retransmission rate is calculated as:

Retransmission rate = (actual transmission times / maximum number of transmissions) X 100%;

Among them, the actual number of transmissions: the data packet is counted from the first transmission, the count start value is 1, each retransmission, the count value is increased by 1;

Maximum number of times that can be sent: The maximum number of times each packet can be sent by the network through air interface signaling. In the above step 302, the preset upper limit threshold and the lower limit threshold may be set according to specific needs, and the upper threshold may be a value between 0 and 30%, and the lower threshold may be taken. A value between 60% and 90%. In this embodiment, the upper threshold is 10% and the lower threshold is 70%.

In step 303, the transmission length of the data packet is adjusted according to the comparison between the current retransmission rate and the up-and-down threshold. Specifically, when the current retransmission rate is greater than 10% of the upper threshold, the length of the data packet is increased by one file; when the current retransmission rate is greater than 70% of the lower threshold, the length of the data packet is lowered. One file.

The up or down adjustment of the transmission length of the foregoing data packet is performed by the user equipment to change a transmission format up or down in the evaluated list of available transmission formats, so that the transmission length of the data packet supported by the transmission format is correspondingly increased or decreased.

In the foregoing step 103, after the transmission format is determined by the transmission evaluation and the length of the data packet, the valid data to be sent is sent to the sending module for transmission. Before sending the data packet, it also includes determining whether a transmission condition is available.

The sending condition is: the available frequency exists within a certain period of time and the available time slot exists, and determining whether the sending condition is met is determining whether the current determined transmission format and the length of the data packet exist simultaneously in a certain period of time. Available frequencies and available time slots. The time period can be set according to a specific application scenario, usually 10 milliseconds. The transmission conditions will exist under normal circumstances. Only in some extreme cases, such as network downlink failure or interruption, the transmission conditions will not be met within a certain period of time. Please refer to FIG. 2 in particular. If there is no transmission condition within the time period, return to the transmission evaluation step, re-evaluate the transmission data packet and send but not recalculate the current retransmission rate, waiting for the next transmission. opportunity.

In the foregoing step 103, if the network side receipt is received after the data packet is sent, the data packet is successfully sent, and after the data packet is successfully sent, the evaluation module saves the retransmission rate of the most recently transmitted successful data packet, as the next first transmission. The initial retransmission rate of the data packet; if the network side receipt is not received within a certain period of time, the data packet transmission fails, and the data packet that failed to be sent is transferred to the pending processing. The data module is transmitted, and the processing retransmission data module is added to the data to be sent, and the next round of transmission of the to-be-sent data packet is evaluated, that is, the process returns to step 101. The time period for accepting the receipt can be adjusted according to the specific application scenario and the characteristics of the service. For some instant transmissions, it is usually several milliseconds to several seconds, and for some services with delay tolerance characteristics, it can be several seconds to several minutes or even several. Hours vary. The function of the process retransmission data module is to cache the data that has not been successfully transmitted and maintain the original data format to wait for the next transmission process.

The data transmission method provided by the embodiment of the present invention includes the retransmission rate into the evaluation content, and adjusts the length of the data packet according to the retransmission rate to obtain an optimized packet transmission length, so that in some specific scenarios, Reduce the retransmission rate and increase the throughput of valid data.

As shown in FIG. 5, an embodiment of the present invention provides a terminal or data transmission apparatus, including an evaluation module 10, a transmission processing module 20, a transmission module 30, and a processing retransmission data module 40.

The sending module 10 sends a sending identifier to the sending data packet, where the evaluation content further includes valid data to be sent existing in the buffer, available transmit power, current available transmission capability, and available transport format set to find the transmit power and the transmission capability. Transport format.

The specific evaluation process includes detecting the size of valid data to be transmitted in the buffer of the user equipment, calculating the currently available transmission capability based on the available transmission power, and finding a transmission format satisfying the transmission power and the transmission capability in the available transmission format set.

The foregoing sending processing module 20 determines the length of the to-be-sent data packet according to the evaluation result, and then adjusts the length of the to-be-sent data packet according to the current retransmission rate. The specific adjustment process is as follows: the action of adjusting the length of the data packet specifically includes: first calculating a current retransmission rate; and comparing the current retransmission rate with a preset uppering threshold and a lowering threshold; and finally, according to the comparison result If the retransmission rate is less than an upper threshold, the transmission format is changed upwards to increase the transmission length of the data packet. If the retransmission rate is greater than the lower threshold, the transmission format is changed downward to reduce the transmission length of the data packet.

The sending module 30 is configured to receive the transmitted evaluation to determine the transmission format and the length of the data packet. After transmitting the data packet, it is detected whether the available frequency and the available time slot exist in the case of determining the current transmission format and the length of the data packet, and if the available frequency and the available time slot are detected, the data packet is sent, and the data packet is successfully transmitted. Afterwards, the current retransmission rate is initialized for the transmission of the next data packet; otherwise, the data packet to be transmitted is transferred to the processing retransmission data module 40, and is added to the data to be transmitted by the processing retransmission data module 40, and is performed by the evaluation module. A round of evaluation of the transmission of the data packet to be sent.

The above calculation method of the current retransmission rate is: retransmission rate = (actual transmission times / maximum number of transmissions) X 100%;

Maximum number of times that can be sent: The maximum number of times each packet can be sent by the network through air interface signaling.

The sending processing module increases the data packet length by transforming a data transmission format when the current retransmission rate is less than 10%, and reduces the data transmission format by converting the data transmission format when the current retransmission rate is greater than 70%. The packet length.

The communication system provided by the embodiment of the present invention is described in detail above, and the principles and implementation manners of the present invention are described in the following. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, the content of the present invention is not limited by the scope of the present invention.

Claims

Rights request

A data transmission method, the method comprising:

Evaluate the data packet and obtain the evaluation result;

Determining a length of the data packet according to the evaluation result, and adjusting a length of the data packet according to a current retransmission rate;

Send the packet.

The method according to claim 1, wherein the step of determining the length of the data packet according to the evaluation result and further adjusting the length of the data packet according to the current retransmission rate includes :

Calculate the current retransmission rate;

Compare the current retransmission rate with the upper threshold and the lower threshold;

According to the comparison result, if the retransmission rate is less than the uppering threshold, the transmission format is changed upwards to increase the transmission length of the data packet. If the retransmission rate is greater than the lowering threshold, the transmission format is changed downward to reduce the transmission length of the data packet. .

The method according to claim 2 or 3, wherein the calculation method of the current retransmission rate is: retransmission rate = (actual transmission times / maximum number of transmissions) X 100%;

4. The method according to claim 3, wherein the up threshold is 10% and the down threshold is 70%.

The method according to any one of claims 1 to 3, characterized in that the step of transmitting a evaluation of the data packet and obtaining the evaluation result comprises:

Detecting the size of the valid data to be sent existing in the buffer of the user equipment;

Calculating the currently available transmission capability based on available transmit power; The evaluation result is obtained, and the evaluation result is a transmission format list that determines the transmission power and the transmission capability while satisfying the set of available transmission formats.

The method according to any one of claims 1 to 3, wherein the step of transmitting the data packet comprises:

Determine whether there is a launch condition;

If there is a transmission condition, the data packet is sent, otherwise the data packet to be transmitted is re-evaluated and transmitted without recalculating the current retransmission rate.

The method according to claim 7, wherein the determining whether the transmission condition is met comprises determining whether the available frequency and the available frequency are available in the case of the currently determined transmission format and the packet length within a certain period of time. Time slot.

The method according to claim 7, wherein the sending the data packet after the sending condition further comprises:

If the network packet is received after the data packet is sent, the data packet is successfully sent. After the data packet is successfully sent, the evaluation module saves the retransmission rate of the most recently transmitted successful data packet, as the next first transmission. The initial retransmission rate of the data packet;

If the receipt of the network side is not received within a certain period of time, the data packet fails to be sent, the data packet is transferred to the to-be-processed retransmission data module, and the processing retransmission data module is added to the to-be-sent data. The evaluation of the transmission of the next round of pending packets is performed.

A terminal, comprising: an evaluation module, a transmission processing module, and a transmitting module, wherein:

The evaluation module sends an evaluation of the data packet and obtains an evaluation result;

The sending processing module initially determines the length of the data packet according to the evaluation result, and further adjusts the length of the data packet according to the current retransmission rate;

The sending module sends the data packet.

The terminal according to claim 9, wherein the sending processing module determines the length of the data packet to be sent after the initial evaluation according to the evaluation result, and then adjusts the current retransmission rate according to the current retransmission rate. The length of the sent packet includes:

By calculating the current retransmission rate;

The terminal according to claim 10, wherein the evaluating module sends the evaluation of the data packet and obtains the evaluation result, including:

Calculating the currently available transmission capability based on available transmit power;

An evaluation result is obtained, the evaluation result being a list of transmission formats that determine both the transmit power and the transmission capability in the set of available transport formats.

The terminal according to claim 10, wherein the current retransmission rate is calculated as: retransmission rate = (actual transmission times / maximum number of transmissions) X 100%;

The terminal according to claim 12, wherein the sending processing module increases the data packet length by transforming a data transmission format when the current retransmission rate is less than 10%, at the current weight When the transmission rate is greater than 70%, the packet length is also reduced by transforming the data transmission format.

A device for data transmission, characterized in that the terminal comprises an evaluation module, a transmission processing module and a transmission module, wherein:

The sending processing module initially determines the length of the data packet according to the evaluation result, and Adjusting the length of the data packet according to the current retransmission rate;

The sending module sends the data packet.

The device according to claim 14, wherein the evaluating module sends the evaluation of the data packet and obtains the evaluation result, including:

The device according to claim 15, wherein the determining, by the sending processing module, after determining the length of the data packet to be sent according to the initial result of the evaluation, adjusting the length of the data packet to be sent according to the current retransmission rate includes:

By calculating the current retransmission rate;