KR101611536B1 - Method of channel setting for establishing system based on cluster - Google Patents
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- KR101611536B1 KR101611536B1 KR1020150055277A KR20150055277A KR101611536B1 KR 101611536 B1 KR101611536 B1 KR 101611536B1 KR 1020150055277 A KR1020150055277 A KR 1020150055277A KR 20150055277 A KR20150055277 A KR 20150055277A KR 101611536 B1 KR101611536 B1 KR 101611536B1
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- 241000854291 Dianthus carthusianorum Species 0.000 claims abstract description 72
- 238000001994 activation Methods 0.000 claims abstract description 37
- 230000004913 activation Effects 0.000 claims description 30
- 230000008054 signal transmission Effects 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 abstract description 9
- 238000004891 communication Methods 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001149 cognitive effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H04W72/0493—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The present invention relates to a channel setting method for constructing a cluster-based system, and more particularly, to a method for establishing a channel based on an ad hoc dynamic spectrum allocation (DSA) or a cluster- To a channel setting method for establishing a channel.
A channel setting method for establishing a cluster-based system according to the present invention is a channel setting method for establishing a cluster-based system between a cluster head and a member node corresponding to a secondary user in a wireless network environment, Dividing the group into a plurality of band groups, dividing each of the band groups into a plurality of channels, and dividing each of the channels into a request lower channel and a response lower channel; A system activation process for searching a common usable channel between the cluster head and the member node through the request lower channel; A membership establishing process for joining the member node as a member of the cluster through the response subchannel; And transmitting the common data channel determination message to the cluster head through the requested lower channel.
Description
The present invention relates to a channel setting method for constructing a cluster-based system, and more particularly, to a method for establishing a channel based on an ad hoc dynamic spectrum allocation (DSA) or a cluster- To a channel setting method for establishing a channel.
The present invention is derived from the research carried out as part of the support project for the future ICT research center of the Institute of Creation Sciences and the Information and Communications Industry Promotion Agency. [Project Title: Spectrum and Propagation Technique for Smart Frequency Usage, (Institution) Detailed Project Number: H8501-15-1019, Assignment No. 1711014156]
[0002] Recently, as the communication with mobility becomes popular, the technology of mobile devices utilizing wireless communication technology is rapidly developing. However, the frequency bands that can be used in wireless communications are limited and are divided and allocated to different communication systems.
Cognitive radio technology is a representative technology for efficiently using frequencies to solve the problem of increasing demand for limited spectrum resources.
The cognitive radio technology refers to a technique that utilizes idle bandwidth of the main users using the authenticated frequency band and performs communication with the sub users within a range that does not disturb the communication of the main users.
An AD-hoc network is an autonomous network in which nodes that can communicate wirelessly without other access points (APs) such as base stations communicate with each other, and dynamic spectrum allocation (DSA) Dynamic Spectrum Allocation) In a network environment, a channel is set for communication between terminals, and the corresponding channel can be used as a data transmission and control channel.
Here, as a method of setting a common channel among nodes, there are a sequence-based method of randomly setting a control channel or allocating a channel according to channel hopping on a predetermined pattern, A group-based method in which adjacent nodes form a cluster or group the same to manage control messages therein.
In order to start communication between nodes using a cluster-based scheme, which may correspond to a group-based scheme among the above-mentioned schemes for setting a common channel, There is a need for a method that minimizes complexity.
Therefore, it is necessary to consider a channel setting method between the cluster head and the member nodes in order to set up the system in the cluster-based environment.
The present invention relates to a system and method for establishing a cluster-based system capable of recognizing a peripheral channel environment through a sensing of a secondary user terminal in a dynamic network environment or a wireless network environment, Provides a setup method.
The present invention also provides a method of establishing a channel for establishing a cluster-based system capable of minimizing a channel setup time for a node in a cluster to start communication and lowering the complexity and improving reliability.
A method for establishing a channel for establishing a cluster-based system according to an embodiment of the present invention is a method for establishing a cluster-based system between a cluster head and a member node corresponding to a secondary user in a wireless network environment, Dividing a frequency band into a plurality of band groups, dividing each band group into a plurality of channels, and dividing each of the channels into a request subchannel and a response subchannel; A system activation process for searching a common usable channel between the cluster head and the member node through the request lower channel; A membership establishing process for joining the member node as a member of the cluster through the response subchannel; And transmitting the common data channel determination message to the cluster head through the requested lower channel.
The system activation process includes sensing a channel available to the cluster head and the member node; Selecting a channel having the highest quality in all or a part of the plurality of band groups and selecting the band group having the largest number of available channels in all of the plurality of band groups; The cluster head advertising the system activation message via the requesting subchannel; And searching for a commonly available channel from the system activation message by the member node.
Wherein the membership establishing process includes: transmitting, by the member node, a join message through the response subchannel to a common usable channel between the cluster head and the member node; And a step of the cluster head having received the join message determining a common data channel based on the information of the member node.
In the step of searching for a channel commonly usable by the member node, the member node can search a common usable channel by checking a system activation message of a request lower channel of the band group selected by the member node.
The process of confirming the system activation message by the member node can confirm the system activation message by comparing the distances between the correlation peaks of Fast Fourier Transform (FFT) samples of the band group selected by the member node.
And a step of retransmitting the join message if the join message transmitted by the member node is lost.
Wherein the step of retransmitting the join message comprises: checking whether the identifier of the member node that transmitted the join message is included in the common data channel determination message; And a step of retransmitting the join message through the response lower channel if the identifier of the member node is not included.
According to the channel setting method for constructing a cluster-based system according to the embodiment of the present invention, a new method of setting a channel usable in common between a cluster head and a plurality of member nodes, The system between the cluster head and the member nodes can be constructed.
In addition, when receiving the system activation message from the cluster head, the member node can quickly construct a system by selecting a band group having the largest number of usable channels, and can perform fast Fourier transform (FFT) calculation for the entire frequency band, It is possible to construct the system only by Fast Fourier Transform (FFT) calculation corresponding to the size of the group, thereby reducing the complexity of the receiving end and improving the reliability.
In addition, by using the transmission pattern of the system activation signal using the autocorrelation, it is robust against the noise, the path attenuation, and the shadowing effect acting on the wireless communication network by finding a common usable channel.
That is, according to the channel setting method for constructing the cluster-based system according to the embodiment of the present invention, it is possible to effectively set the system without a separate common control channel in the system construction of the cluster head and the member node.
FIG. 1 is a flowchart illustrating a channel setting method for constructing a cluster-based system according to an embodiment of the present invention; FIG.
2 is a view showing a state in which the entire frequency band is divided.
3 shows an embodiment in which a cluster head selects a channel;
4 illustrates an embodiment in which a cluster head advertises a system activation message on a requesting subchannel.
Figures 5 through 7 illustrate an embodiment in which a member node finds a channel using the correlation of FFT samples.
Figure 8 illustrates an embodiment in which a member node sends a join message over a response subchannel;
9 is a diagram illustrating an embodiment in which a join message is retransmitted when a join message transmitted by a member node is lost;
The channel setting method for constructing a cluster-based system according to the present invention includes: recognizing a peripheral channel environment by sensing a dynamic spectrum allocation or a secondary user terminal in a wireless network environment; And to provide a technical feature that can be done.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Wherein like reference numerals refer to like elements throughout.
FIG. 1 is a flowchart illustrating a channel setting method for constructing a cluster-based system according to an embodiment of the present invention.
Referring to FIG. 1, a channel setup method for establishing a cluster-based system according to an embodiment of the present invention includes a cluster-based system between a cluster head (CH) and a member node (MN) The method comprising: dividing a frequency band into a plurality of band groups, dividing each band group into a plurality of channels, and dividing each of the channels into a request subchannel and a response subchannel (S100); A system activation process (S200) for searching a common usable channel between the cluster head (CH) and the member node (MN) through the request lower channel; A membership establishing step (S300) for the member node (MN) to join as a member of the cluster through the response lower channel; And transmitting the common data channel determination message to the cluster head (CH) through the requested lower channel (S400).
The channel setting method for constructing a cluster-based system according to an embodiment of the present invention is characterized in that when there is no separate common control channel between the nodes in the cluster in the ad hoc or dynamic spectrum allocation or wireless network environment, It is characterized by providing a method for setting a channel.
Hereinafter, a channel setting method for constructing a cluster-based system according to an embodiment of the present invention will be described in detail with reference to the drawings.
2 is a diagram showing a state in which the entire frequency band is divided.
Referring to FIG. 2, in step S100, a frequency band is divided into a plurality of band groups, each band group is divided into a plurality of channels, And a response subchannel.
That is, in order to reduce the complexity of the receiver in the process of dividing the entire frequency band,
At this time, each band group is composed of M channels, and the m-th channel of the band group g
Each channel is composed of two subchannels for a request message and a response message, and the subchannel for the request and response messages of the m-th channel of the band group g is composed of
The system activation process (S200) includes a process (S210) of sensing a usable channel by the cluster head (CH) and the member node (MN); The cluster head CH selects a channel having a good quality in all or a part of the plurality of band groups, and the member node MN selects a band group having the largest number of usable channels in all of the plurality of band groups (S230); (S250) of the cluster head (CH) advertising the system activation message through the requesting subchannel; And a step (S270) of the member node (MN) searching for a channel that is commonly available from the system activation message.
More specifically, since the node in the cluster is a secondary user prior to system construction in a wireless network, it does not have a spectrum band that can be continuously used. Therefore, the process of sensing a usable channel (S210) is required.
In the channel selection process of the cluster head CH and the band group selection process S230 of the member node MN, the cluster head CH has a good channel state in all available channels of all or some of the band groups, Select these excellent channels.
At this time, the selection of the channel can apply different criteria according to the system parameter designed by the user, but at least one channel in each band group and a maximum of max_b channels in all band groups can be selected.
3 shows an embodiment in which a cluster head CH selects a channel, b bg denotes a set of channels having a good state in each band group,
In addition, in the channel selection of the cluster head CH and the band group selection process of the member node MN (S230), the member node MN selects the band group having the largest available channel among all the band groups.
Then, in the system activation message advertisement process (S250), the cluster head CH transmits a system activation (SA) signal through a lower channel for a request message in the selected channel to advertise.
Hereinafter, the process (S270) of the member node (MN) searching for a commonly available channel from the system activation message will be described in more detail.
Figure 4 is an illustration of an embodiment in which a cluster head (CH) advertises a system activation message via a requesting subchannel.
At this time, the cluster head CH can select a maximum of max_b channels, but even if max_b channels are not selected
The signal transmission period is used by the member node (MN) to search for a channel commonly available from the system activation signal. That is, since the fast Fourier transform (FFT) sample of the system activation signal has a specific correlation with respect to the signal transmission period, the member node MN can quickly and easily find the channel advertised by the cluster head CH.
FIG. 5 is a diagram schematically illustrating a process of finding a channel using a correlation of Fast Fourier Transform (FFT) samples. Referring to FIG. 5, for example, an autocorrelation R j of a subchannel j shown in FIG. A common channel between the cluster head CH and the member node MN is determined by determining whether a system activation signal is present in the corresponding channel by comparing the distances between the peaks of the correlation degree to be described later .
Here, the fast Fourier transform (FFT) is an algorithm for calculating a Fourier transform for converting the time domain into the frequency domain at high speed, thereby eliminating the repeated calculation process, thereby quickly calculating the Fourier transform value. In addition, autocorrelation means a value indicating a correlation between different time series data to determine the presence or absence of information having periodicity. Details of the fast Fourier transform (FFT) and autocorrelation and calculation processes are well known, and a detailed description thereof will be omitted.
6 is a graph showing an example of the autocorrelation value to illustrate the predefined characteristic. Since the cluster head (CH) and the member node (MN) share information about max_b and the number of band groups,
7 is a diagram illustrating an embodiment in which the cluster head CH and the member node MN find a common channel by comparing the correlation feature of the fast Fourier transform (FFT) sample described above, that is, the distance between the peaks of the
In order to reduce the overhead caused by fast Fourier transform (FFT) calculation of the entire band or all the band groups, the member node MN selects a band group having the largest number of usable channels as described above, The overhead and complexity of computation can be reduced.
In this case, the autocorrelation is calculated only for the odd-numbered subchannels corresponding to the requested subchannel to which the system activation signal is transmitted, and the channel in which the primary user exists does not calculate the autocorrelation.
If a channel common to the cluster head (CH) is not found in the selected band group, the process of searching in another band group is repeated.
In the membership setting process S300, the member node (MN) transmits a join (JOIN) message through the response subchannel to a common usable channel between the cluster head CH and the member node MN (S310); And a step (S330) of the cluster head (CH) having received the join message to determine a common data channel based on the information of the member node (MN).
The process of transmitting a join message (S310) transmits a join message through a response subchannel only to the member node (MN) that has received the system activation message in the advertisement process of the system activation (System Activation) message described above .
That is, FIG. 8 shows a case where a member node (MN) that finds a common channel between a cluster head (CH) and a member node (MN) transmits a join message through a response subchannel through the correlation pattern of the fast Fourier transform (MN) transmits a join message and transmits its own information to a cluster head (CH).
In this case, the member node (MN) can include its available channel list and state information in the join message in the entire band group. In order to avoid collision of join messages, the member node (MN) Lt; / RTI >
The member node MN that has transmitted the join message no longer requests the channel decision message (CD) from the cluster head CH by switching to the request subchannel without calculation of Fast Fourier Transform (FFT) .
That is, the cluster head (CH) receiving a sufficient number of join messages from the member node (MN) determines (S330) a common data channel (including a hopping pattern when the frequency hopping method is used for data transmission) And transmits it through a common data channel decision (Channel Decision) message.
In more detail, the cluster head CH determines a channel set to be used for communication based on the information of the member node (MN) obtained from the join message, and transmits a common data channel decision message (Channel Decision) do.
In this case, the common data channel determination message includes an identifier (ID) of a member node (MN) that has sent a join message, and the cluster head CH has the same channel as the channel that advertised the system activation signal A common data channel determination message including an identifier of a member node (MN) is advertised.
The member node (MN) that successfully received the common data channel determination (Channel Decision) message can confirm the scheduling information through the common data channel determination message, thereby completing the system construction for communication.
9 is a diagram illustrating an embodiment in which a join message is retransmitted when a join message transmitted by a member node (MN) is lost.
Referring to FIG. 9, a channel setup method for establishing a cluster-based system according to an embodiment of the present invention includes a process (not shown) for retransmitting a join message when a join message transmitted by the member node MN is lost, As shown in FIG.
Here, the step of retransmitting the join message may include: checking whether the identifier of the member node (MN) that transmitted the join message is included in the common data channel determination message; And a step of retransmitting the join message through the response subchannel if the identifier of the member node (MN) is not included.
Since the common data channel determination (Channel Decision) message includes the identifier (ID) of the member node (MN) that sent the join message, if the join message transmitted by the member node MN is not normally delivered to the cluster head The identifier of the member node (MN) of the received common data channel determination (Channel Decision) message is not included in the list of its own.
Accordingly, after confirming whether the identifier of the member node (MN) that transmitted the join message is included in the common data channel determination message, the member node (MN) checks whether the transmitted join message is not normally transmitted to the cluster head The UE directly moves to the response subchannel to retransmit the join message and confirms that its identifier is included in the member node (MN) identifier list of the next common data channel determination message (Channel Decision) message. The system construction can be completed.
Therefore, according to the channel setting method for constructing the cluster-based system according to the embodiment of the present invention as described above, it is possible to efficiently construct the system between the cluster head (CH) and the member node (MN) You will be able to make settings.
While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and the embodiments of the present invention and the described terminology are intended to be illustrative, It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.
Claims (7)
Dividing the entire frequency band into a plurality of band groups, dividing each band group into a plurality of channels, and dividing each of the channels into a request subchannel and a response subchannel;
A system activation process for searching a common usable channel between the cluster head and the member node through the request lower channel;
A membership establishing process for joining the member node as a member of the cluster through the response subchannel; And
And transmitting, by the cluster head, a common data channel determination message through the request subchannel,
The system activation process includes:
The cluster head advertising a system activation message at a predetermined signal transmission period through the request lower channel; And
The method comprising the steps of: determining whether a distance between correlation peaks of fast Fourier transform samples of at least one band group is equal to a signal transmission period of the system activation message by the member node and searching for a common usable channel; How to set up a channel to build a system.
Wherein the step of the cluster head advertising the system activation message comprises:
Wherein the cluster head selects a channel having a good quality in all or a part of the plurality of band groups, advertises a system activation message through a request lower channel of the selected channel,
Wherein the step of searching for a common channel by the member node comprises:
Wherein the member node selects a band group having the largest number of usable channels in all of the plurality of band groups and searches a usable channel commonly in the selected band group.
In the membership setting process,
Transmitting, by the member node, a join message through the response subchannel to a common usable channel between the cluster head and the member node; And
And the cluster head having received the join message determines a common data channel based on the information of the member node.
Wherein the signal transmission period of the system activation message is a value obtained by multiplying the maximum number of channels selectable by the cluster head by a lower channel time including a request lower channel and a response lower channel.
Further comprising the step of retransmitting the join message if the join message transmitted by the member node is lost.
The step of retransmitting the join message comprises:
Confirming whether the identifier of the member node that transmitted the join message is included in the common data channel determination message; And
And if the identifier of the member node is not included, re-transmitting the join message through the response subchannel.
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| KR101879930B1 (en) * | 2016-05-03 | 2018-07-18 | 인하대학교 산학협력단 | Method for sensing spectrum and allocating channel using gene algorithm in the cognitive radio network |
| KR102361817B1 (en) * | 2020-11-04 | 2022-02-14 | 한화시스템 주식회사 | Method for determining rendezvous channel |
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2015
- 2015-04-20 KR KR1020150055277A patent/KR101611536B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101879930B1 (en) * | 2016-05-03 | 2018-07-18 | 인하대학교 산학협력단 | Method for sensing spectrum and allocating channel using gene algorithm in the cognitive radio network |
| KR101712427B1 (en) * | 2016-07-27 | 2017-03-06 | 한화시스템(주) | Method for setting common channel in between head node and member nodes for Ad-hoc Cognitive Radio Networks and system for the same |
| KR102361817B1 (en) * | 2020-11-04 | 2022-02-14 | 한화시스템 주식회사 | Method for determining rendezvous channel |
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