KR101523145B1 - Method for traffic distribution for multi-link terminal - Google Patents

Abstract

The present invention relates to a method for distributing traffic for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interface which includes the steps of: entering a power saving mode to inactivate the wireless link and to prevent the traffic transmission in any one wireless link if an amount of traffic transmitted satisfies a preset transmission delay requirement condition in case two or more wireless links are activated and the traffic is transmitted; and restarting the traffic transmission by activating the wireless link of the power saving mode if the amount of traffic does not satisfies the transmission delay requirement condition. According to the present invention, the energy consumption of the wireless communication using the multi-link is saved.

Description

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

The present invention relates to wireless communication and networking, and more particularly, to a traffic distribution 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.

Recently, the multi-link wireless communication infrastructure is being built due to the increase of dual band AP (Access Point). For example, 802.11n @ 2.4 GHz + 802.11a @ 5 GHz.

The current dual band AP is a structure that connects to the terminal using only one interface at a time.

By using a plurality of wireless links at the same time, the bandwidth of the communication connection can be increased, and the data can be distributed and transmitted through a plurality of wireless links. However, the use of multi-link has a disadvantage of increasing the power consumption of the smart terminal.

In general, a wireless link consumes a lot of energy without sending or receiving data. For example, in the case of a wireless LAN, idle listening is performed even when the wireless LAN is not in the power saving mode, resulting in high energy consumption.

Korean Patent No. 10-1041645

SUMMARY OF THE INVENTION It is an object of the present invention to provide a traffic distribution method for a multi-link wireless terminal capable of reducing energy consumption by entering an adaptive power saving mode of a multi-radio link.

It is another object of the present invention to provide a traffic distribution method that satisfies a transmission delay requirement of traffic and performs an adaptive power saving mode operation without degrading TCP traffic.

Another object of the present invention is to provide a method of distributing traffic in consideration of TCP while preventing a performance degradation and an abnormal operation of multipath TCP in case of sudden link disconnection.

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 traffic distribution method for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces, If the amount of traffic to be transmitted satisfies a predetermined transmission delay requirement, entering a power saving mode for stopping and deactivating traffic delivery for any one of the radio links, and if the amount of traffic exceeds the transmission delay requirement And if the condition is not satisfied, activating the wireless link in the power save mode to resume traffic forwarding.

D is the transmission delay requirement, Twakeup is the time until the next activation of the radio link, and Ttx is the time required for transmission of the traffic, the transmission delay requirement is only satisfied if D> Twakeup + Ttx May be implemented to maintain a power saving mode for the wireless link.

And moving the remaining traffic to another wireless link when there is remaining traffic in the buffer of the wireless link entering the power saving mode.

In the step of resuming the traffic transfer, an arbitrary packet may be transmitted to the buffer of the corresponding radio link before the actual traffic is allocated to the corresponding radio link.

In the case of using a transmission control protocol (TCP), when an integrated layer of a wireless terminal determines to enter a power save mode of a wireless link, it notifies the TCP layer of the wireless terminal, And performing a subflow disconnection procedure with the server.

Alternatively, in the case of using a multipath transmission control protocol (TCP), when an access point (AP) determines the entry of the wireless link into the power save mode, it notifies the integrated layer of the wireless terminal, And performing a subflow disconnection procedure with the server that transmits the traffic.

According to the present invention, it is possible to reduce the energy consumption of the wireless communication using the multi-link.

According to the present invention, it is possible to prevent performance degradation through interlocking operation with TCP.

1 is a block diagram showing a connection between a multi-link AP and a multi-link terminal.
FIG. 2 is a flowchart illustrating a power saving mode entry control process for each wireless link by adjusting the inter-link traffic distribution according to an exemplary embodiment of the present invention.
3 is a flowchart illustrating a traffic distribution procedure through interworking with a TCP layer 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 showing a connection between a multi-link AP and a multi-link terminal.

Referring to FIG. 1, a multi-link wireless terminal 100 and a multi-link AP (Access Point) 200 transmit data traffic for each link. That is, the link 1 of the multi-link wireless terminal 100 and the link 1 of the multi-link AP 200 are in data communication with each other, and the link 2 of the multi-link wireless terminal 200 and the link 2 of the multi- Data communication.

The multi-link wireless terminal 100 includes an application layer, a transmission control protocol (TCP) / Internet protocol (IP) layer, and an integration layer. The multi-link AP 200 includes an integration layer.

FIG. 2 is a flowchart illustrating a power saving mode entry control process for each wireless link by adjusting the inter-link traffic distribution according to an exemplary embodiment of the present invention.

Referring to FIG. 2, in a traffic distribution method for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces, a link is deactivated in link 2 of AP 200 When it is determined to enter the power save mode (S201), the terminal 2 notifies the terminal 2 of the link 2 (S203).

Then, the residual traffic of the link 2 buffer of the terminal 100 is moved to link 1 (S205), and similarly, the remaining traffic of the link 2 buffer of the AP 200 is moved to link 1 (S207).

Then, new traffic assignment is excluded for link 2 (S209).

Next, the link 2 enters the power saving mode (S211).

Hereinafter, a traffic distribution method in the case where the power save mode is determined in the terminal 100 is as follows.

When it is determined that the link is inactivated on the link 2 of the terminal 100 and enters the power save mode (S213), the link is notified to the link 2 of the AP 200 (S215).

The remaining traffic of the link 2 buffer of the terminal 100 is moved to the link 1 (S217), and the remaining traffic of the link 2 buffer of the AP 200 is moved to the link 1 (S219).

Then, new traffic allocation is excluded for link 2 (S221).

Next, the link 2 enters the power saving mode (S223).

As described above, in the present invention, when two or more wireless links are being activated and traffic is being transmitted, if the amount of traffic to be transmitted meets a predetermined transmission delay requirement, a power saving mode for stopping and deactivating traffic transmission for any one of the wireless links Let it enter.

If the amount of traffic does not satisfy the transmission delay requirement, the wireless link in the power saving mode is activated to restart the traffic transmission.

D is the transmission delay requirement, Twakeup is the time until the next activation of the wireless link, and Ttx is the time required to transmit the traffic,

The transmission delay requirement is expressed by the following equation.

[Equation 1]

D> Twakeup + Ttx

In the present invention, the power saving mode may be maintained for the corresponding wireless link only when Equation (1) is satisfied.

In the present invention, when there is residual traffic in the buffer of the wireless link to enter the power saving mode, the residual traffic can be moved to another wireless link.

In an embodiment of the present invention, a delay time may occur due to activation of a link in a power saving mode, so that a packet may be transmitted to a buffer of a corresponding radio link before the actual traffic is allocated to the corresponding radio link .

3 is a flowchart illustrating a traffic distribution procedure through interworking with a TCP layer according to an embodiment of the present invention.

Referring to FIG. 3, when the power saving mode for the link is determined in the integrated layer of the AP 200 (S301), the integrated layer of the terminal 100 is notified (S303).

Then, the integrated layer of the terminal 100 transmits a subflow disconnection command to the TCP layer (S305).

In the TCP layer, the TCP layer and the subflow disconnection procedure of the server 300 are performed (S307).

Hereinafter, a traffic distribution procedure when the power saving mode is determined in the terminal 100 will be described.

When the power saving mode for the link is determined in the unified layer of the terminal 100 (S309), the subflow disconnection command is transmitted to the TCP layer of the terminal 100 (S311).

At the TCP layer, the TCP layer and the subflow disconnection procedure of the server 300 are performed (S313).

In the present invention, when a transmission control protocol (TCP) is used in the present invention, when a wireless link enters a power save mode in an integrated layer of a wireless terminal, the TCP layer notifies the TCP layer of the wireless terminal, A subflow disconnection procedure with the transmitting server can be performed.

In the present invention, when an access point (AP) decides to enter the power saving mode of a wireless link, it notifies the integrated layer of the wireless terminal, and the integrated layer allows the TCP layer to perform a subflow disconnection process with a server have. This has the advantage of maintaining the end-to-end context of TCP.

When the re-activation of the link is determined, the TCP layer of the wireless terminal may proceed to reconnect the sub-flow with the server similarly to the above case.

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 multi-link wireless terminal 200 Multi-link AP
300 server

Claims (6)

A method for distributing traffic for a multi-link wireless terminal in a multi-link wireless communication system supporting two or more wireless communication interfaces and including a multi-link wireless terminal and a multi-link wireless access point (AP)
If more than one wireless link is active and traffic is being transmitted, if the amount of traffic transmitted for any one of the wireless links satisfies a predetermined transmission delay requirement, the multi-link wireless terminal or the multi- Entering a power saving mode for stopping and deactivating traffic forwarding for the link;
The multi-link wireless terminal or the multi-link wireless AP activating a wireless link in a power save mode to resume traffic delivery if the amount of traffic does not satisfy the transmission delay requirement; And
Wherein the multi-link wireless terminal or the multi-link wireless AP includes a step of moving residual traffic to another wireless link when there is remaining traffic in a buffer of a wireless link to enter the power save mode,
D is the transmission delay requirement, Twakeup is the time until the next activation of the wireless link, and Ttx is the time required to transmit the traffic,
The transmission delay requirement may include:
D> Twakeup + Ttx
The power saving mode is maintained for the wireless link only,
Wherein the step of resuming the traffic transfer is to forward any packet to a buffer of the corresponding radio link before allocating the actual traffic to the corresponding radio link.
delete delete delete The method according to claim 1,
In the case of using a transmission control protocol (TCP), when an integrated layer of a wireless terminal determines to enter a power save mode of a wireless link, it notifies the TCP layer of the wireless terminal, Further comprising the step of performing a subflow disconnection procedure with the server.
The method according to claim 1,
When an access point (AP) determines the entry of a wireless link into a power save mode, it notifies the integrated layer of the wireless terminal, and the integrated layer notifies the TCP layer of the traffic when using the transmission control protocol (TCP) And performing a sub-flow disconnection procedure with the server that transmits the multicast packet.

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