KR20150069406A - Method for link control for multi-link terminal - Google Patents

Abstract

The present invention relates to a link control method for a multi-link wireless terminal in a multi-link wireless communications system capable of supporting one or more wireless communication interfaces, the invention comprising the steps of: measuring a quality of each link in the state where a plurality of links are on simultaneously and storing the same; learning correlation, which is an associative relationship of quality data between multi-link, by using the quality data, which is measured, for each link; and producing the correlations in a database table. According to the present invention, an on/off of a link is controlled based on correlations between the links of a wireless terminal and thereby, it is possible to stabilize a connection upon a link on/off of a multi-link wireless terminal and to enhance the performance of a multi-link transmission.

Description

[0001] The present invention relates to a link control method for a multi-link wireless terminal,

The present invention relates to wireless communication and networking, and more particularly, to a link control method for a multi-link wireless terminal supporting two or more wireless communications.

The development of the communication network is called the ocean of information which is transmitted by the information of every part of the world in an unstoppable time. The international computer network The internet is very important and useful to all human beings and it is a technology that broadens the choice to all members of society.

The IT technology history of electronic information communication using this is that when the calling number is taken by wireless communication, the order number is taken on the other device, and after passing through the simple pager of the analog function which called by calling the calling number, Former vice president of Motorola (1973) who made cellular phone (voice function) After Martin Kofer's simple voice mobile phone technology era, feature phone technology that transmits characters and images in real time is generalized.

The feature phone, which combines the Internet technology, IT technology, and satellite communication network technology to transmit and receive voice, text, and image, is an innovative IT technology compared to a pager and a cellular phone.

However, recently, Apple's iPhone (iphone), Samsung's Galaxy S smartphone (smartphone), etc., can not be used as a personal computer Operating systems and implementation functions, such as providing interfaces and platforms for software execution, are destroying the feature phone monopoly market.

Web browser for launching Mosaic browser with successful commercial network Web browser for accessing world wide page by using Microsoft's Internet Explorer, Mozilla's Firefox, etc. Feature phone, Connect to Mobilis Facebook, which allows smartphones to create and download applications that feature phones can not use, such as listening to music, getting directions, scheduling, viewing e-books, and implementing augmented reality. And SNS (Mobile Social Networking Service), which is represented by Twitter, provide a PC-like interface and platform, and the SNS service improvement function to increase the search share from the users, , Web, homepage, etc., Development of competition is fierce.

In the service technology market of the feature phone and the smartphone, a tablet PC called a small PC is equipped with an operating system (OS) of Microsoft (MS) Windows 7, a webcam and an SD card slot, a micro HDMI terminal and another Wi- (Wi-LAN) In addition to Bluetooth, Tablet PC, which is different from iPad that can connect to WiMAX, is in the initial stage of commercialization. It is an IT device of internet communication network that Internet technology and IT technology are used in combination with satellite communication network technology. The next generation PC device that connects to smartphone, smartphone, tablet PC phone, desktop PC, and notebook PC after the feature phone connects to the Internet network and the Internet network and connects IT devices connected to the Internet network , The result of service quality and amount of service varies greatly according to the result of the viewpoint decision of the service entity managing and operating the service after connection.

In recent years, there has been a system for implementing a communication network that combines Internet technology, IT device technology, and satellite communication network technology, and a next-generation PC device that includes smart phones, tablet PCs, desktop PCs, The mobile CPU (human brain) and GPU (multi-monitor) technologies continue to evolve to make intelligent decisions and roles that make data analysis more sophisticated, mathematically computational, intelligent, and emotional.

Many smart terminals such as smart phones and tablet PCs are equipped with a plurality of wireless communication interfaces. For example, a mobile communication interface such as long term evolution (LTE) and a plurality of wireless communication interfaces such as Wi-Fi.

However, in many cases, current smart terminals are limited to use only one interface at a time.

By using a plurality of wireless links at the same time, the reliability of the communication connection can be increased. Usually, when one link is temporarily unavailable, it is implemented to use another link immediately. This has been used in a variety of applications such as a medical field where a communication connection has to be performed with high reliability.

However, the use of multi-link has a disadvantage of increasing the power consumption of the smart terminal. Thus, the reliability and energy efficiency of communication links are in a trade-off relationship.

Thus, the conventional multi-link wireless terminal system is inefficiently driven and has a problem that optimal performance can not be achieved.

Korean Patent No. 10-1041645

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a multi-link wireless terminal that achieves energy efficiency through on / off of a link and improves performance through link- The present invention relates to a method of controlling a link.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a link control method for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces, Measuring quality of each link and storing the quality of each link, learning association, which is a correlation of quality data between multi-links, using the quality data of each link measured, and making the association table DB .

Determining whether a transmission delay due to an increase in transmission traffic exceeds a predetermined reference value when there is a link that is off in the multi-link, if the transmission delay exceeds a predetermined reference value, Estimating the quality of the link that is turned off by using the quality data of the link that is turned on; calculating an index necessary for cost prediction according to the predicted quality; And a step of turning on a link that is off when the predicted cost is less than a predetermined value.

In the step of calculating the indicator, the indicator includes a transmission delay decrease estimated by turning on a link that is off, an additional energy consumption expected by turning off the link being turned off, a total network performance change . ≪ / RTI >

In the step of predicting the cost, the cost can be predicted by adding all the values obtained by multiplying the calculated indices by the weights.

A step of converting a transmission rate according to quality of each link into a DB and a step of determining whether to change the transmission rate by referring to a transmission rate depending on the quality of another link when an event for changing a transmission rate of one of the links is changed .

According to the present invention, the on / off control of the link is controlled based on the link-to-link association of the wireless terminal, thereby stabilizing the link-on / off connection of the multi-link wireless terminal and improving the performance of the multi- have.

1 is a block diagram of a multi-link wireless communication system supporting multi-link.
2 is a graph showing the relationship between reliability and power consumption according to the use of the multi-link.
3 is a flowchart illustrating a link control method for a multi-link wireless terminal according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method of determining a transmission rate for a multi-link wireless terminal according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted in an ideal or overly formal sense unless expressly defined in the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a block diagram of a multi-link wireless communication system supporting multi-link.

Referring to FIG. 1, a multi-link wireless communication system is a system supporting multi-link of an LTE interface link and a Wi-Fi interface link.

The wireless terminal 100 is a terminal supporting the multi-link mode of the LTE interface AP 310 and the Wi-Fi interface AP 320.

The integrated femtocell base station 200 controls the LTE interface AP 310 and the WiFi interface AP 320.

The wireless terminal 100 is an environment in which both an LTE link and a Wi-Fi link can be used.

2 is a graph showing the relationship between reliability and power consumption according to the use of the multi-link.

Referring to FIG. 2, when connecting only the highest priority link among the multiple links, power consumption is low but reliability is low. And, if you always connect using multi-link, you have high reliability but power consumption too.

Therefore, there is a need for an adaptive multi-link system that controls the link more efficiently in accordance with the multi-link environment.

In a wireless communication environment supporting such a multi-link, not all of the multi-links are always connectable due to differences in the connection range between the AP links of the respective links.

In the present invention, a method of controlling a link more efficiently based on the inter-link correlation is proposed.

3 is a flowchart illustrating a link control method for a multi-link wireless terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a link control method for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces, (S301).

Specifically, step S301 is a step of measuring and storing the quality of each link when a plurality of links are simultaneously turned on, and associating the quality of each link with the quality data of each link And a step of DB (Database) tabulation of learning steps and associativity.

For example, if x is quality data of link 1 and y is quality data of link 2, it can be expressed as a matching function of the form y = f (x).

Next, if there is a link that is off in the multi-link, it is checked whether a transmission delay due to an increase in transmission traffic exceeds a predetermined reference value (S303).

If the transmission delay exceeds a predetermined reference value, the quality of the link that is turned off is predicted using the quality data of the link that is turned on (S305).

Then, an index necessary for cost prediction is calculated according to the predicted quality (S307).

Then, the cost generated by turning on the link that is off by using the calculated index is predicted (S309).

If the predicted cost is less than the predetermined value, the link is turned off (S311, S313).

In step S307, the indicator includes expected transmission delay reduction due to the link being turned off, additional energy consumption expected when the off link is turned on, and total network performance variation expected by turning off the link.

In steps S311 and S313, the cost can be predicted by adding all the values derived by multiplying the calculated indices by the weights.

For example, suppose that x is the predictive quality of a link that is off, D (x) is the expected transmission delay reduction due to link on, E (x) is the expected additional energy consumption And B (x) represents the total amount of change in network performance expected by the link being turned on.

In the present invention, if the lower additional cost C estimated by turning on the link off is smaller than a predetermined value, the link is turned on.

C = -a x D (x) + b x E (x) - c x B (x)

Where a, b, and c are weights for each cost that are greater than or equal to zero.

4 is a flowchart illustrating a method of determining a transmission rate for a multi-link wireless terminal according to an embodiment of the present invention.

Referring to FIG. 4, a transmission rate according to quality of each link is converted into a DB (S401).

When an event that changes the transmission rate of a certain link is generated, it is determined whether to change the transmission rate with reference to the transmission rate according to the quality of another link (S403).

For example, g (x) is a transmission rate relation function according to link quality x, g (f (x)) is the estimated transmission of link 2 according to the prediction quality f (x) R2 = h (r1) is a correlation function between the transmission rate r1 of the link 1 and the transmission rate r2 of the link 2, and r1 = h (r2) is also established.

As described above, in the present invention, the transmission rate change event of one link is determined by referring to the quality-transmission rate data of another link.

r1 is the current transmission rate of link 1, r2 is the current transmission rate of link 2, e1 (r) is the transmission failure rate when link 1 is using transmission rate r, e2 , R1> h (r2), and increases r2 by one level when e1 (r1) is smaller than a certain value. This case increases the transmission rate of the link 1 since the current transmission rate of the link 1 works well enough.

On the other hand, if r2> h (r1) and e1 (r1) and e2 (r2) are larger than a certain value, r2 is decreased by one step. In this case, since the current transmission rate of the link 1 does not work well, the transmission rate of the link 2 is reduced.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and the scope of the appended claims.

100 wireless terminal 200 Integrated femtocell base station
310 LTE interface AP 320 Wi-Fi interface AP

Claims (5)

A link control method for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces,
Measuring and storing the quality of each link when a plurality of links are on at the same time;
Learning the correlation, which is a correlation of quality data between multi-links, using quality data of each link measured; And
And linking the association to a database (DB) table.
The method according to claim 1,
Confirming whether a transmission delay due to an increase in transmission traffic exceeds a predetermined reference value when there is a link that is off in the multi-link;
If the transmission delay exceeds a predetermined reference value, estimating a quality of a link that is turned off using link quality data on;
Calculating an index necessary for cost prediction according to the predicted quality;
Estimating a cost generated by turning on an off link using the calculated index; And
And turning on a link that is off if the estimated cost is less than a predetermined value. ≪ Desc / Clms Page number 20 >
The method of claim 2,
In calculating the indicator,
Wherein the indicator includes expected transmission delay reduction due to the link being turned off, additional energy consumption expected due to the turning-off of the off link, and a total network performance variation expected by turning off the link. Link control method for a wireless terminal.
The method of claim 3,
In predicting the cost,
And estimating the cost by adding all the values obtained by multiplying the calculated indices by weights.
The method of claim 2,
Converting a transmission rate according to quality of each link into a DB; And
Further comprising the step of determining whether to change the transmission rate by referring to a transmission rate depending on the quality of another link when an event for changing the transmission rate of one of the links is generated.

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