KR100838520B1 - Method of adaptively configuring fragmentation size for wireless personal area network system and computer-readable medium having thereon program performing function embodying the same - Google Patents

Abstract

An adaptive fragmentation size determining method of a local area wireless network system and a computer readable recording medium recording a program for implementing the same are provided to control a frame fragmentation size by determining a sampling section according to retransmission frequency of a frame or receiving signal strength, to transmit a frame of the controlled frame fragmentation size and a frame bigger or smaller than the above frame, and to update an optimum frame fragmentation size by using the transmission result. As changing a sampling section, channel state information for frame fragmentation size determination is configured(S110). According to the channel state information, an optimum sampling section size or an optimum fragmentation size is determined(S120). According to the determined size, frame transmission is performed in a local area wireless network system(S130). Time used for transmission by optimum fragmentation size and test fragmentation size is extracted and an optimum fragmentation size is updated according to the extracted time(S140).

Description

METHOD OF ADAPTIVELY CONFIGURING FRAGMENTATION SIZE FOR WIRELESS PERSONAL AREA NETWORK SYSTEM AND COMPUTER-READABLE MEDIUM HAVING THEREON PROGRAM PERFORMING FUNCTION EMBODYING THE SAME}

1 is an exemplary flow chart of a method for adaptive partition size determination in a short range wireless network system in accordance with the present invention;

2 is a diagram illustrating an example of a structure and channel state information used in an adaptive partition size determination method of a short-range wireless network system according to the present invention.

3 is a diagram exemplarily illustrating an operation on a time axis of an adaptive split size determination method of a short range wireless network system according to the present invention;

The present invention relates to an adaptive partition size determination method of a short-range wireless network system and a computer-readable recording medium recording a program for realizing the same. More particularly, the sampling interval is determined according to the number of retransmissions of a frame or the received signal strength. To adjust the frame division size, and transmit the frame of the adjusted frame division size and a frame larger or smaller than that, and use the result to update the optimal frame division size. In this case, the adaptive partition size determination method of the short-range wireless network system that increases the transmission performance of the short-range wireless network system by efficiently controlling the transmission speed by controlling the transmission speed, and a computer recording a program for realizing the same. It relates to a readable recording medium.

With the recent increase in demand for home and ubiquitous networks, IEEE 802.15.3 high-speed wireless PAN (wireless personal area network) technology that can connect home appliances, office equipment, or various information devices at home at high speed without the inconvenience of wiring. This is attracting attention. The high-speed wireless PAN technology developed by the IEEE 802.15.3 Working Group aims at high speed multimedia data transmission between wireless terminals at a short range of 5 to 55 m.

Another wireless PAN technology, Bluetooth, has a maximum transmission speed of 1 Mbps or less, and IEEE 802.15.3 high-speed wireless PAN technology supports transmission rates of up to 55 Mbps using the current 15.3 HR WPAN as an example. However, in order to support large-capacity multimedia data such as video data, image data or MP3 file data more efficiently, IEEE 802.15.3a Task Group introduced UWB (Ultra-Wideband), a new physical layer technology, to provide high-speed data of up to 480 Mbps at close range. Efforts are being made to establish a standard for transmission. If such a technology standard is enacted and the market is activated, it is expected to replace the existing wireless PAN technology, which is applied to home automation, to provide efficient data communication between wireless terminals in the home.

In the IEEE802.15.3 high-speed wireless PAN, data communication is performed using the ISM band. Therefore, performing communication by analyzing the radio channel environment of the ISM band has a great influence on the performance of the high speed wireless PAN system.

For example, in case of frame-based communication, when the frame length is long, reception reliability is deteriorated due to the characteristics of the radio channel. Thus, the reliability is improved by dividing the frame into short-length frames according to the change in the radio channel environment. We are introducing a method for this.

This frame division is performed based on the sampling interval. In this case, although the sampling interval is short, there is an advantage that it can quickly cope with the environment of the wireless channel, but there is a disadvantage that may adversely affect the transmission performance due to being too sensitive to the temporary environmental change of the wireless channel.

The present invention relates to a method and a recording medium for increasing a transmission amount of a system by adaptively determining a division size in response to an environmental change of a wireless channel in such a short-range wireless network system.

An object of the present invention is to adjust the frame division size by determining the sampling interval according to the number of retransmissions or the received signal strength of the frame, and transmit the frame of the adjusted frame division size and the frame larger or smaller than this and use the result to optimize When the number of retransmissions increases even when the frame division size is adjusted, the short-range wireless network system increases the transmission performance of the short-range wireless network system by controlling the transmission speed to efficiently respond to changes in the wireless channel environment. An adaptive partition size determination method is provided.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for realizing each step of the method for adaptive division size determination in a short-range wireless network system described above.

In order to achieve the above technical problem, the present invention provides a method for adaptive division size determination in a short-range wireless network system, comprising the steps of: (a) configuring channel state information for frame division size determination while changing a sampling interval, and (b) An adaptive partition size determination method of a short-range wireless network system including determining an optimal sampling interval size or an optimal partition size according to the channel state information.

In the adaptive split size determination method of a short-range wireless network system according to the present invention, the channel state information may include information on the number of retransmissions of a frame or received signal strength information.

In the adaptive split size determination method of a short-range wireless network system according to the present invention, the step (b) may include (b-1) the optimal sampling interval according to a device type or a type of a frame to be transmitted in the short-range wireless network system. The method may further include determining a size or the optimal division size.

In addition, in the adaptive partition size determination method of the short-range wireless network system according to the present invention, the step (b) is (b-2) initializing the channel state information after determining the optimal sampling interval size or the optimal partition size. It may further comprise the step.

In the adaptive split size determination method of a short-range wireless network system according to the present invention, after the step (b), (c) transmitting a frame having the optimal split size according to the optimal sampling interval size, and (d) transmitting a frame having an experimental division size larger or smaller than the optimal division size according to the optimal sampling interval size.

In the adaptive splitting size determination method of a short-range wireless network system according to the present invention, after step (d), (e) extracting time used for the transmission according to the optimal splitting size or the experimental splitting size. And (f) updating the optimum partition size based on the time used for the transmission.

In addition, in the adaptive partition size determination method of the short-range wireless network system according to the present invention, the step (e) further comprises the step of (e-1) extracting the number of retransmissions in the transmission, the step ( f) may further include (f-1) lowering the speed of the transmission when the number of retransmissions is greater than a predetermined threshold number.

The method may further include (g) updating the optimal sampling interval size according to the number of retransmissions in the method for determining an adaptive partition size of a short-range wireless network system according to the present invention.

In addition, the adaptive split size determination method of a short-range wireless network system according to the present invention, further comprising: (h) periodically reconstructing the channel state information and updating the optimal sampling interval size or the optimal split size accordingly; can do.

In addition, in the adaptive split size determination method of a short-range wireless network system according to the present invention, the step (h) may include (h-1) the reconstructed channel after updating of the optimal sampling interval size or the optimal split size is completed. The method may further include initializing the status information.

In addition, in the adaptive split size determination method of a short range wireless network system according to the present invention, the short range wireless network system may be a wireless communication system conforming to the IEEE 802.15.3 standard.

The present invention also provides a computer-readable recording medium having recorded thereon a program for realizing each step of the adaptive division size determination method of the above-mentioned short-range wireless network system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a specific embodiment of an adaptive partition size determination method of a short-range wireless network system of the present invention and a computer-readable recording medium recording a program for realizing the same will be described in more detail with reference to the accompanying drawings.

1 is a diagram illustrating an exemplary flowchart of an adaptive split size determination method of a short range wireless network system according to the present invention.

The short-range wireless network system according to the present invention may be, for example, a wireless communication system conforming to the IEEE 802.15.3 standard, or may be a wireless communication system of a wireless LAN standard that performs wireless communication using other frame division.

First, channel state information for determining the frame division size is configured while changing the sampling interval (S110).

Configuration of channel state information is performed in the following manner.

2 is a diagram illustrating an example of a structure and channel state information used in an adaptive partition size determination method of a short-range wireless network system according to the present invention.

As shown, a station information base (SIB) structure includes a field (FragCtrl) for segmentation control. The station information base may be configured for each device in the network to which the adaptive split size determination method of the short-range wireless network system according to the present invention is applied. Or it may be configured according to the type of frame.

An exemplary configuration of the field FragCtrl for split control is indicated by Frag_Ctrl_s.

As shown in FIG. 2, the Frag_Ctrl_s may include channel state information indicated by fragStat or optimal division size indicated by optimalFragSize or sampling interval information indicated by samplingWindow.

The optimal split size is possible with multiple split sizes, such as the maximum split size (maxfragSize) or the minimum split size (minfragSize), as shown. For such multiple partition sizes, channel state information may be configured for each partition size, for example, as shown in FIG.

Reference numerals denoted by 0 to 15 at the upper portion of the channel state information are information corresponding to the number of retransmissions when the packet is transmitted.

Channel state information may be configured according to the number of retransmissions.

For example, in the case of the division size A, the channel state information is composed of the number 15 when the number of retransmissions is 0, the number 4 when the number of retransmissions is 1, and the like.

For example, in the case of the division size B, the channel state information is composed of the number 95 when the number of retransmissions is 0, the number 24 when the number of retransmissions is 1, and the like.

For example, in the case of the division size C, the channel state information is composed of the number 12 when the number of retransmissions is 0, the number 3 when the number of retransmissions is 1, and the like.

When the channel state information is divided into each partition size, the retransmission is performed. If the channel state information is successful, the channel state information is increased in response to the retransmission of the corresponding number of times.

For example, in the case of the division size B, if retransmission is performed twice and the transmission is successful, the corresponding value, that is, the value 15 corresponding to the number of retransmissions 2 is increased.

The channel state information may be configured while changing the sampling interval.

3 is a diagram exemplarily illustrating an operation on a time axis of an adaptive split size determination method of a short range wireless network system according to the present invention.

That is, as shown, the channel state information is created while changing the sampling interval.

The channel state information is configured according to the case where transmission is successful (TxOK), transmission fails (TxFail), or the like for the first sampling interval shown.

In addition, the channel state information is configured according to the number of retransmissions of the frame, but may be configured according to, for example, received signal strength (RSSI) information. Even when configured according to the received signal strength information, the channel state information can be configured by applying the above-described structure.

After the channel state information is configured, an optimal sampling interval size or an optimal division size is determined according to the channel state information (S120). Of course, the optimal partition size means the partition size when the information transmission volume is the largest, which means that the number of retransmissions is as low as possible. That is, as described above, the number of retransmissions (or RSSI) for each division size (A, B, C, etc.) is determined for each sampling interval to determine the best division size (eg, the division size with the lowest retransmission number: C of FIG. 2). ) Can be determined as the optimal partition size, and the sampling interval size when the state information on the optimal partition size is obtained can be determined as the optimal sampling interval size.

The optimal sampling interval size or the optimal partition size may be determined according to the device type or the type of frame to be transmitted in the short range wireless network system.

In addition, after determining the optimal sampling interval size or the optimal partition size, the channel state information may be initialized. The initialization of the channel state information may then be performed to configure the channel state information again to determine an optimal sampling interval size or an optimal partition size suitable for the channel situation.

When the optimal sampling interval size or the optimal partition size is determined through the steps S110 to S120, frame transmission may be performed in the short-range wireless network system according to this step (S130).

However, it is possible not only to use such an optimum division size, but also to be configured to be adaptively updated according to the channel state even after the optimum sampling interval size or the optimal division size is determined, so that it can be configured to respond to changes in the wireless channel environment.

To this end, the adaptive split size determination method of the short-range wireless network system according to the present invention may further include step S1140.

In the frame transmission of step S130, preferably, a frame having an optimal division size is transmitted according to the optimum sampling interval size.

However, at this stage, not only the frame having the optimal partition size but some frames may transmit a frame having a size larger or smaller than this optimal partition size, i.

The frame transmission having the experimental partition size is for adaptively updating and determining the optimal partition size.

In other words, in step S130, the time used for transmission of the optimal partition size and the experiment partition size may be extracted, and the optimal partition size may be updated accordingly (S140). That is, when the transmission time performed according to the optimal partition size determined by the above-described process is excessive (for example, when exceeding a preset threshold), the transmission frame is reset to a smaller experimental partition size to transmit the frame of the experimental partition size. If we extract the transmission time of, and this time is not excessive, we update the optimal partition size to the experimental partition size.

In this case, referring to the number of retransmissions, the frame rate can be adjusted.

In other words, if excessive retransmission occurs even when the transmission time is excessive and the experimental division size smaller than the optimal division size, that is, when the number of retransmissions exceeds the threshold number compared with a predetermined threshold number, in this case, the frame rate is lowered to reduce the radio channel. Update at the right rate for your environment. This threshold number of times is preset according to the state of the communication channel. This update of transmission rate may be applied, for example, when excessive retransmission occurs even when the optimal partition size is updated and data transmission is performed again.

Through this process, data transmission suitable for a wireless channel environment may be performed.

In addition, the optimum sampling interval size can be updated according to the number of retransmissions. In other words, when the number of retransmissions is large, efficient wireless data transmission is performed by reducing the size of subsequent sampling intervals.

Meanwhile, the statistical information configured in step S110 may be periodically reconfigured according to the radio channel environment. In other words, the statistical information is reconfigured at regular intervals, thereby updating the enemy sampling interval size or the optimal partition size.

In this case, as described above, it is preferable to initialize the reconstructed channel state information after the update of the optimal sampling interval size or the optimal partition size is completed.

When the adaptive split size determination method of the short-range wireless network system according to the present invention is applied, transmission efficiency can be increased by adaptively adjusting the split size even in the complex change of the wireless environment caused by using the ISM band.

The present invention also provides a computer-readable recording medium having recorded thereon a program for realizing each step of the method for adaptive division size determination in a short-range wireless network system according to the present invention described above.

However, a detailed description of such a computer-readable recording medium will be omitted since it overlaps with the method for determining the adaptive partition size of the short-range wireless network system according to the present invention described with reference to FIGS.

Although the configuration of the present invention has been described in detail, these are merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. This will be possible. Therefore, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. If the scope of the present invention is to be interpreted by the claims below, it should be interpreted that all techniques falling within the scope of the present invention are included in the scope of the invention.

As described above, according to the present invention, the sampling interval is determined according to the number of retransmissions of the frames or the received signal strength to adjust the frame division size, and the frame having the adjusted frame division size and the frame larger or smaller are transmitted as a result. If the number of retransmissions is increased even by adjusting the frame division size, the transmission rate is controlled to increase the transmission performance of the short-range wireless network system efficiently by controlling the transmission speed. Can be.

Claims (12)

An adaptive split size determination method of a short range wireless network system, (a) configuring channel state information for determining a frame division size while changing a sampling interval; (b) determining a partition size having the lowest number of retransmissions as an optimal partition size according to the channel state information; Adaptive partition size determination method of a short-range wireless network system comprising a. The method of claim 1, And the channel state information includes information on the number of retransmissions of a frame or received signal strength information. delete The method of claim 1, wherein step (b) (b-2) further comprising initializing the channel state information after determining the optimal partition size. The method of claim 1, wherein after step (b), (c) transmitting the frame having the optimum partition size; (d) transmitting a frame having an experimental partition size different from the optimal partition size Adaptive partition size determination method of a short-range wireless network system further comprising. The method of claim 5, wherein after step (d), (e) extracting time used for the transmission according to the optimal partition size or the experimental partition size; (f) updating the optimum partition size based on the time used for the transmission Adaptive partition size determination method of a short-range wireless network system further comprising. The method of claim 6, The step (e) further comprises the step of (e-1) extracting the number of retransmissions in the transmission, The step (f) may include (f-1) lowering the speed of the transmission when the number of retransmissions is greater than a predetermined threshold number. Adaptive partition size determination method of a short-range wireless network system that further comprises. The method of claim 7, wherein (g) updating the optimum partition size according to the number of retransmissions Adaptive partition size determination method of a short-range wireless network system that further comprises. The method of claim 1, (h) periodically reconstructing the channel state information and updating the optimum partition size accordingly Adaptive partition size determination method of a short-range wireless network system further comprising. The method of claim 9, wherein step (h) comprises (h-1) initializing the reconstructed channel state information after the update of the optimal partition size is completed; Adaptive partition size determination method of a short-range wireless network system that further comprises. The method of claim 1, And the short range wireless network system is a wireless communication system conforming to the IEEE 802.15.3 standard. 12. A computer-readable recording medium having recorded thereon a program for realizing each step of the adaptive split size determination method of a short-range wireless network system according to any one of claims 1, 2 and 4.

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