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KR20140076064A - Apparatus and method for determinging transmit power of mobile node - Google Patents

Apparatus and method for determinging transmit power of mobile node Download PDF

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Publication number
KR20140076064A
KR20140076064A KR1020120144181A KR20120144181A KR20140076064A KR 20140076064 A KR20140076064 A KR 20140076064A KR 1020120144181 A KR1020120144181 A KR 1020120144181A KR 20120144181 A KR20120144181 A KR 20120144181A KR 20140076064 A KR20140076064 A KR 20140076064A
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KR
South Korea
Prior art keywords
mobile node
transmission power
radio signal
signal transmission
relative speed
Prior art date
Application number
KR1020120144181A
Other languages
Korean (ko)
Inventor
이재용
윤명준
Original Assignee
연세대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020120144181A priority Critical patent/KR20140076064A/en
Publication of KR20140076064A publication Critical patent/KR20140076064A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the speed of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed are an apparatus and method for determining the wireless signal transmission power of a mobile node. The disclosed apparatus for determining the wireless signal transmission power of a mobile node comprises: a relative speed calculating unit which calculates a relative speed between the mobile node and a target mobile node; and a transmission power determining unit which determines the wireless signal transmission power of the mobile node which is to be changed according to time, by using the relative speed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for determining a radio signal transmission power of a mobile node,

Embodiments of the present invention relate to an apparatus and method for determining a transmit power of a mobile node (mobile node), and more particularly, to a mobile node that can minimize the possibility of link disconnection To an apparatus and method for determining a wireless signal transmission power of a node.

In a wireless network composed of a plurality of mobile nodes, a communication link may be disconnected due to a change in distance between mobile nodes due to movement.

More specifically, the transmission distance of the radio signal generally has a relationship proportional to the transmission power of the radio signal. However, in the conventional wireless network system, since the mobile node transmits a radio signal with a constant transmission power, if the distance between the mobile nodes becomes larger than the transmission distance of the radio signal due to the constant transmission power, have.

In order to solve the above problems, the prior art attempts to minimize the occurrence of a communication link disconnection by transmitting a radio signal with a relatively sufficient level of transmission power.

However, even if a radio signal is transmitted with a sufficient level of transmission power as described above, if the transmission power is relatively low, the communication link disconnection may still occur. If the transmission power is relatively high, interference between other mobile nodes , Waste of unnecessary energy, and the like.

In order to solve the above problems, the present invention relates to an apparatus and method for determining a radio signal transmission power of a mobile node that minimizes the possibility of link disconnection that may occur in communication between mobile nodes.

It is another object of the present invention to provide an apparatus and method for determining a radio signal transmission power of a mobile node that can prevent waste of unnecessary energy in a mobile node and improve data throughput of the wireless network.

Other objects of the invention will be apparent to those skilled in the art from the following examples.

In order to achieve the above object, according to a preferred embodiment of the present invention, there is provided an apparatus for determining a transmission power of a radio signal of a mobile node, the apparatus comprising: a relative speed calculator calculating a relative speed between the mobile node and a target mobile node; And a transmission power determiner for determining the radio signal transmission power of the mobile node to change with time according to the relative speed.

Wherein the transmission power determining unit calculates a slope of a radio signal transmission power that varies with the passage of time at a first point of time and determines the radio signal transmission power at a point of time after the first point in time using the calculated slope The slope of the radio signal transmission power may be proportional to the relative speed.

Wherein the transmission power determining unit determines a transmission power of the mobile node based on a path loss between the mobile node and the target mobile node, a radio signal transmission distance of the mobile node at the first time, a maximum possible transmission distance of the mobile node, The slope of the radio signal transmission power can be calculated.

When the relative speed increases in the positive direction, the slope of the radio signal transmission power can be expressed by the following equation.

Figure pat00001

(D 0 ) is a path loss function between the mobile node and the target mobile node, d 0 is a reference distance, P target is a slope of the radio signal transmission power, at least the power, R max is a maximum radio signals of the mobile node, the transmission distance, R i 0 is the transmission distance wireless signal of the mobile node at the first point in time, n is the pathloss parameters, υ refers to the relative velocity, respectively do.

When the relative speed increases in the negative direction, the slope of the radio signal transmission power may be expressed by the following equation.

Figure pat00002

(D 0 ) is a path loss function between the mobile node and the target mobile node, d 0 is a reference distance, P target is a slope of the radio signal transmission power, at least the power, R min is the minimum radio signal of the mobile node, the transmission distance, R i 0 is the transmission distance wireless signal of the mobile node at the first point in time, n is the pathloss parameters, υ refers to the relative velocity, respectively do.

According to another embodiment of the present invention, there is provided a method of determining radio signal transmission power of a mobile node, the method comprising: calculating a relative speed between the mobile node and a target mobile node; And determining a radio signal transmission power of the mobile node to increase with time according to the relative speed.

According to the present invention, it is possible to minimize the possibility of link disconnection that may occur in communication between mobile nodes.

Also, according to the present invention, it is possible to improve the data throughput of the wireless network while preventing waste of unnecessary energy in the mobile node.

FIG. 1 is a diagram illustrating a schematic configuration of an apparatus for determining a radio signal transmission power of a mobile node according to an embodiment of the present invention. Referring to FIG.
2 is a diagram illustrating an example of a wireless signal transmission power determination of a mobile node determined according to an embodiment of the present invention.
3 is a diagram illustrating a schematic configuration of a method for determining a radio signal transmission power of a mobile node 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. Like reference numerals are used for like elements in describing each drawing.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a schematic configuration of an apparatus for determining a radio signal transmission power of a mobile node according to an embodiment of the present invention. Referring to FIG.

1 includes a relative speed calculator 110 and a transmission power determiner 120. The relative speed calculator 110 and the transmission power determiner 120 may be included in a mobile node that transmits a radio signal (data) . Hereinafter, the function of each component will be described in detail with reference to an example in which the mobile node includes the radio signal transmission power determination apparatus 100 of the mobile node.

The relative speed calculator 110 calculates the relative speed between the mobile node and the destination mobile node. Here, the destination mobile node means a mobile node that wants to receive a radio signal transmitted from the mobile node.

As an example, the mobile node and the destination mobile node are equipped with a position measuring device such as GPS, and the relative speed calculating section 110 calculates the speed of the mobile node through the information obtained from the position measuring device installed in the mobile node Calculates the speed of the target mobile node by using the position measurement information from the target mobile node, and calculates the relative speed based on the vector difference of the target mobile node.

Next, the transmission power determination unit 120 determines the transmission power of the radio signal of the mobile node using the above-described relative speed. In other words, the transmission power determination unit 120 may determine the transmission power of the mobile node's radio signal so that the transmission power is changed according to the time, using the relative speed between the mobile node and the target mobile node.

According to an embodiment of the present invention, the transmission power determination unit 120 calculates a slope of a wireless signal transmission power that varies with time at a first point of time, The wireless signal transmission power of the node can be calculated. At this time, the slope of the radio signal transmission power may be set to be proportional to the relative speed. Accordingly, after the first time, the mobile node transmits the radio signal with the transmission power varying according to the slope.

For example, when the relative speed increases in the positive direction, the mobile node and the target mobile node are moving in directions away from each other, so that the transmission power determining unit 120 increases the radio signal transmission power of the mobile node. Accordingly, the possibility that the communication between the mobile node and the destination mobile node is disconnected due to the increase of the wireless signal transmission distance of the mobile node is reduced.

As another example, when the relative speed increases in the negative direction, the mobile node and the target mobile node move in a direction approaching each other, so that the transmission power determination unit 120 decreases the transmission power of the mobile node's radio signal . Accordingly, the wireless signal transmission distance of the mobile node is reduced, unnecessary energy consumption at the mobile node is reduced, and interference with other mobile nodes is reduced.

For this, according to an embodiment of the present invention, the transmission power determining unit 120 may determine a path loss between the mobile node and the target mobile node, a distance of the mobile node to transmit the radio signal at the first time, It is possible to calculate the slope of the wireless signal transmission power by further using any one of the possible transmission distance and the minimum possible transmission distance.

As an example, when the relative speed increases in the positive direction, the slope of the radio signal transmission power can be expressed by Equation 1 below.

Figure pat00003

(D 0 ) is the path loss function between the mobile node and the target mobile node, d 0 is the reference distance, and P target is the minimum distance for the receiving node to recognize the radio signal. Power, R max is the maximum possible transmission distance of the mobile node, R i 0 is the distance at which the mobile node transmits the radio signal at the first time, and v is the relative speed.

As another example, when the relative speed increases in the negative direction, the slope of the radio signal transmission power may be expressed by Equation (2) below.

Figure pat00004

Herein, R min denotes a minimum possible transmission distance of the mobile node.

Meanwhile, the determination of the transmission power at the first time of the transmission power determination unit 120 may be repeatedly performed in units of a predetermined time. Accordingly, as shown in FIG. 2, the wireless signal transmission power determination operation with respect to time is repeatedly performed.

As described above, the wireless signal transmission power determination apparatus 100 of the mobile node determines the transmission power of the wireless signal considering the mobility of the mobile node, It is possible to minimize the possibility of

Also, according to the present invention, it is possible to improve the data throughput of the wireless network while preventing waste of unnecessary energy in the mobile node.

3 is a diagram illustrating a schematic configuration of a method for determining a radio signal transmission power of a mobile node according to an embodiment of the present invention.

Hereinafter, a process performed in each step will be described with reference to FIG.

First, in step S310, the relative speed between the mobile node and the destination mobile node is calculated.

Next, in step S320, the radio signal transmission power of the mobile node is determined so as to change with the passage of time using the relative speed.

According to an embodiment of the present invention, in step S320, the slope of the radio signal transmission power that varies with the passage of time is calculated at the first point of time, and the radio signal transmission power at the point in time after the first point of time The signal transmission power can be determined. In this case, the slope of the radio signal transmission power is proportional to the relative speed.

In addition, according to an embodiment of the present invention, in step S320, the path loss between the mobile node and the target mobile node, the transmission distance of the mobile node's wireless signal at the first time, and the maximum possible transmission distance of the mobile node It is possible to calculate the slope of the wireless signal transmission power.

The embodiments of the method for determining the radio signal transmission power of the mobile node according to the present invention have been described and the configuration related to the apparatus 100 for determining the radio signal transmission power of the mobile node described with reference to FIG. Applicable. Hereinafter, a detailed description will be omitted.

In addition, embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Examples of program instructions, such as magneto-optical and ROM, RAM, flash memory and the like, can be executed by a computer using an interpreter or the like, as well as machine code, Includes a high-level language code. The hardware devices described above may be configured to operate as one or more software modules to perform operations of one embodiment of the present invention, and vice versa.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and limited embodiments and drawings. However, it should be understood that the present invention is not limited to the above- Various modifications and variations may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (6)

An apparatus for determining a radio signal transmission power of a mobile node,
A relative speed calculator for calculating a relative speed between the mobile node and the target mobile node; And
And a transmission power determiner for determining a radio signal transmission power of the mobile node to change with time according to the relative speed. The method according to claim 1,
Wherein the transmission power determining unit calculates a slope of a radio signal transmission power that varies with the passage of time at a first point of time and determines the transmission power of the radio signal at a point of time after the first point in time using the calculated slope However,
Wherein the slope of the radio signal transmission power is proportional to the relative speed. 3. The method of claim 2,
Wherein the transmission power determining unit determines a transmission power of the mobile node based on a path loss between the mobile node and the target mobile node, a radio signal transmission distance of the mobile node at the first time, a maximum possible transmission distance of the mobile node, And calculates the slope of the radio signal transmission power by using the calculated power of the mobile station. The method of claim 3,
Wherein the slope of the radio signal transmission power is expressed by the following equation when the relative speed increases in a positive direction.

Figure pat00005


(D 0 ) is a path loss function between the mobile node and the target mobile node, d 0 is a reference distance, P target is a slope of the radio signal transmission power, at least the power, R max is a maximum radio signals of the mobile node, the transmission distance, R i 0 is the transmission distance wireless signal of the mobile node at the first point in time, n is the pathloss parameters, υ refers to the relative velocity, respectively box. The method of claim 3,
Wherein the slope of the radio signal transmission power is expressed by the following equation when the relative speed increases in a negative direction.

Figure pat00006


(D 0 ) is a path loss function between the mobile node and the target mobile node, d 0 is a reference distance, P target is a slope of the radio signal transmission power, at least the power, R min is the minimum radio signal of the mobile node, the transmission distance, R i 0 is the transmission distance wireless signal of the mobile node at the first point in time, n is the pathloss parameters, υ refers to the relative velocity, respectively box. A method for determining a radio signal transmission power of a mobile node,
Calculating a relative speed between the mobile node and the destination mobile node; And
And determining the radio signal transmission power of the mobile node to be increased with the passage of time using the relative speed.
KR1020120144181A 2012-12-12 2012-12-12 Apparatus and method for determinging transmit power of mobile node KR20140076064A (en)

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