KR20190078272A - An efficient multi-hop network configuration system and method in TV idle band environment - Google Patents

Abstract

The present invention relates to a method for composing an efficient multi-hop network in a TV idle band environment. The method comprises: a step in which a coordinator transmits a network information request signal to a TVWS database server for acquiring network information; a step in which the coordinator receives a network information response signal from the TVWS database server; a step in which the coordinator determines whether a channel allocation request signal is received from an upper router or not when the channel allocation request signal for allocating a channel is received; a step in which the coordinator sets a multi-hop network by using a channel available to be allocated from the received channel information response signal when the channel allocation request signal is received from the upper router in the determination step; and a step in which the coordinator sets a channel in the multi-hop network for a lower router by transmitting the channel allocation response signal through the upper router to a lower router when the channel allocation request signal is received from the relevant lower router in the determination step. Therefore, the method for composing an efficient multi-hop network in a TV idle band environment can establish a multi-hop network for operating in a multi-frequency channel by being allocated with an available frequency changing according to the situation in a TV idle frequency band and efficiently utilizing the available frequency.

Description

An efficient multi-hop network configuration in a TV idle band environment is proposed.

The present invention relates to an efficient multihop network configuration method in a TV idle band environment, and more particularly, to an efficient multi-hop network configuration method in a TV harmful band environment using a TVWS (Television White Space) Hop network configuration system and method.

The available frequency of the TVWS band refers to an empty frequency band that is not used locally in the TV broadcast band.

As a method for securing an available channel in the TVWS band, there is a method using a TVWS database and a spectrum sensing method.

First of all, the method of using database is advantageous in terms of interference of existing protection service because it can acquire highly reliable available channel, but all devices must be able to connect to database at all times, and a separate database must be constructed and operated .

On the other hand, the spectrum sensing method for securing the available channels in the TVWS band is advantageous in that it can secure the available channels actively according to the surrounding environment without the need of location positioning and database connection, but it is difficult to accurately implement the sensing technology, .

SUMMARY OF THE INVENTION The present invention has been conceived to solve the conventional problems, and it is an object of the present invention to provide a multi-hop network operating in a multi-frequency channel by effectively allocating available frequencies varying according to circumstances in a TV idle frequency band, Hop network configuration system and method in a multi-hop environment.

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 method for efficiently configuring a multihop network in a TV harmful band environment, the method comprising: providing a TVWS database server, a coordinator, at least one router, A multi-hop network configuration method, comprising: transmitting, by the coordinator, a network information request signal to the TVWS database server to obtain network information; The coordinator receiving a network information response signal from the TVWS database server; And setting up a multi-hop network using the channel assignable from the channel information response signal received by the coordinator.

Setting a multi-hop network using the channel to which the coordinator can allocate, and transmitting a beacon signal through the multi-hop network; And a controller for selecting a channel which is not used in another network and has no influence on peripheral channel interference when a channel allocation request signal is received from a router receiving the beacon signal from the coordinator, And transmitting an assignment response signal to the corresponding router.

The router searches for a network that already exists in the TVWS band using the network search function. Selecting an appropriate network to participate in using the network descriptor information obtained by the router as a result of the network search; Receiving a beacon broadcast by the router from the selected network and performing a network joining process to synchronize the beacon; And a step in which the router requests a channel assignment to a coordinator or an upper router of the joined network, and allocates and sets a channel.

When the router receives a channel allocation request from a lower router or a terminal device, the router transmits a channel allocation request signal to the coordinator managing the channel stripper through an upper router. The coordinator transmits a channel allocation response signal to the upper router And receiving the message.

If a channel to be allocated in the channel descriptor managed by the coordinator is not available, a step of allocating a new TV channel from the TVWS database server and dividing it into four PHY channels internally and adding the new TV channel as a new channel descriptor; And selecting the channel again from the channel descriptor to which the coordinator is added and transmitting the channel allocation so that it can be received by the first requesting router.

Generating a network capable of managing through the corresponding channel; And performing data communication with terminal devices joined to the network generated by the router.

An efficient multi-hop network configuration system in a TV harmful band environment according to an embodiment of the present invention includes a TVWS database server for managing available TV channel information; A coordinator for transmitting a network information request signal to the TVWS database server for network information acquisition and allocating an allocatable channel from the received channel information response signal to the network upon receiving a network information response signal from the TVWS database server; And a router for selecting a channel of a connectable network using the descrambling information of the connectable network, requesting a channel allocation request signal, and allocating a multi-hop channel through the channel allocation response signal.

According to an embodiment of the present invention, only a coordinator, a router, and a coordinator constituting a multi-hop network use a TVWS database server. In the case of routers and terminal devices having different configurations, Since the channel setting of the network becomes possible, it is possible to allocate the TVWS effective channel while improving the reliability of the channel setting.

FIG. 1 is a functional block diagram for explaining an efficient multi-hop network configuration system in a TV harmful band environment according to an embodiment of the present invention. FIG.
2 is a flowchart illustrating an efficient multi-hop network configuration method in a TV harmful band environment according to an exemplary embodiment of the present invention.
3 is a flowchart illustrating a channel allocation method of a router in an efficient multi-hop network configuration method in a TV harmful band environment according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a channel allocation process of a lower router in an efficient multi-hop network configuration method in a TV harmful band environment according to an exemplary embodiment of the present invention; FIG.
5 is a flowchart illustrating a channel addition method of the coordinator 200 in an efficient multi-hop network configuration method in a TV harmful band environment according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below 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, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms " comprises, " and / or "comprising" refer to the presence or absence of one or more other components, steps, operations, and / Or additions.

1 is a functional block diagram illustrating an efficient multi-hop network configuration system in a TV harmful band environment according to an embodiment of the present invention. 1, an efficient multi-hop network configuration system in a TV harmful band environment according to an exemplary embodiment of the present invention includes a TVWS database server 100, a coordinator 200, at least one router 300, (400).

The TVWS database server 100 manages available TV channel information.

The coordinator 200 transmits a network information request signal to the TVWS database server 100 in order to acquire network information and receives a network information response signal from the TVWS database server 100, To the network. Here, the network information request signal may include location information, device index information, and device capacity information, and the network information response signal may include channel information, schedule information of a channel, and rule setting information.

The router 300 selects a channel of a connectable network using the descrambling information of the connectable network, delivers a channel allocation request signal using the selected channel, and sets a multi-hop channel through the channel allocation response signal .

When the channel assignment request signal is received from the terminal device 400, the router 300 transmits the received channel assignment request signal to the coordinator 200 and transmits a channel assignment response signal, which is transmitted from the coordinator 200, To the device 400 and establishes a channel with the terminal device 9400). The router 300 may be configured as a lower router 320 having a plurality of metrics in a tree form.

According to an embodiment of the present invention, only the coordinator 200 among the coordinator 200, the router 300, and the terminal device 400 constituting the multi-hop network uses the TVWS database server 100, Hop network can be set without connecting to the TVWS database server 100 in the case of the terminal device 300 and the terminal device 400, it is possible to allocate the TVWS effective channel while improving the reliability of the channel setting.

Hereinafter, an efficient multi-hop network configuration method in a TV harmful band environment according to an embodiment of the present invention will be described with reference to FIG.

2, an efficient multi-hop network configuration method in a TV harmful band environment according to an exemplary embodiment of the present invention includes a TVWS database server 100, a coordinator 200, at least one router 300, (400) in the network environment.

First, the coordinator 200 transmits a network information request signal to the TVWS database server 100 to acquire network information (S110).

Then, the coordinator 200 receives a network information response signal from the TVWS database server 100 (S120).

When the coordinator 200 receives a channel allocation request signal for channel allocation, it determines whether a channel allocation request signal is received from the upper router 310 in step S130.

If the channel assignment request signal is received from the upper router 310 in the determining step S130, the coordinator 200 sets up a multi-hop network using a channel that can be allocated from the received channel information response signal (S140 ).

On the other hand, when the channel assignment request signal is received from the lower router 320 in the determining step S130, the coordinator 200 transmits a channel assignment response signal to the lower router 320 through the upper router 310 And sets a channel of the multi-hop network to the lower router 320 (S150).

According to an embodiment of the present invention, when a multi-hop network is composed of a TVWS database server 100, a coordinator 200, a plurality of routers 300 having a tree structure, and a terminal device 400, The channel for the available frequency of the TV broadcast band is reliably allocated using the TVWS database server 100 and the DB and the channel is not directly connected to the TVWS database server 100 in the case of the router 300 and the terminal device 400 It is possible to reliably allocate a channel with respect to an available frequency of the TV broadcast band.

3 is a flowchart illustrating a channel allocation method of a router in an efficient multi-hop network configuration method in a TV harmful band environment according to an embodiment of the present invention.

As shown in FIG. 3, the coordinator 200 sets up a multi-hop network using an assignable channel, and transmits a beacon signal through the corresponding multi-hop network at step S150.

When the channel assignment request signal is received from the router 300 that has received the beacon signal, the coordinator 200 selects a channel that is not used in another network and has no influence on peripheral channel interference in the channel descriptor managed by the router 300, And transmits a channel assignment response signal including the channel information to the corresponding router 300 (S160).

4 is a flowchart illustrating a channel allocation process of a lower router in an efficient multi-hop network configuration method in a TV harmful band environment according to an exemplary embodiment of the present invention.

On the other hand, the router 300 searches for a network that already exists in the TVWS band using the network search function (S210).

Then, the router 300 selects an appropriate network to participate using the information of the network descriptors obtained as a result of the network search (S220).

Thereafter, the router 300 receives a beacon broadcast in the selected network, and performs a network joining process to synchronize the beacon (S230).

Then, the router 300 requests channel assignment to the coordinator 200 or the upper router 310 of the joined network, and allocates and sets a channel of the multi-hop network at step S240.

When the router 300 receives a channel allocation request from the lower router 320 or the terminal 400, the router 300 transmits a channel allocation request signal to the coordinator 200 managing the channel stripper through the upper router 310 And receives a channel assignment response signal from the coordinator 200 through the upper router 310.

The router 300 allocated with the channel creates a network that can be managed through the corresponding channel and performs data communication with the terminal devices 400 joined to the created network.

Hereinafter, a channel addition method of the coordinator 200 in an efficient multi-hop network configuration method in a TV harmful band environment according to an embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 5, the coordinator 200 determines whether there is a channel to be allocated in the channel descriptor managed by the coordinator 200 (S310).

If there is no channel to be allocated in the determination step (S310) (NO), the coordinator 200 allocates a new TV channel from the TVWS database server 100 and internally divides it into four PHY channels to obtain a new channel descriptor (S320).

Then, the coordinator 200 selects a channel again from the added channel descriptor, and transmits the channel allocation to the router 300 that has requested the first time to be received (S330).

While the present invention has been described in detail with reference to the accompanying drawings, it is to be understood that the invention is not limited to the above-described embodiments. Those skilled in the art will appreciate that various modifications, Of course, this is possible. Accordingly, the scope of protection of the present invention should not be limited to the above-described embodiments, but should be determined by the description of the following claims.

100: TVWS database server 200: coordinator
300: Router 400: Terminal device

Claims (6)

A method for configuring an efficient multi-hop network using a TV idle band in a network environment comprising a TVWS database server, a coordinator, at least one router and an end terminal,
The coordinator transmitting a network information request signal to the TVWS database server to obtain network information;
The coordinator receiving a network information response signal from the TVWS database server;
Determining whether a channel allocation request signal is received from an upper router when the coordinator receives a channel allocation request signal for channel allocation;
Setting a multi-hop network using an assignable channel from a channel information response signal received by the coordinator when a channel allocation request signal is received from an upper router in the determining step; And
When the channel assignment request signal is received from the lower router in the determining step, the coordinator transmits a channel assignment response signal to the lower router through the upper router to set a channel of the multi-hop network to the lower router An Efficient Multihop Network Configuration Method in TV Harmful Band Environment.
The method according to claim 1,
Setting a multi-hop network using a channel assignable to the coordinator and transmitting a beacon signal through the multi-hop network; And
When the coordinator receives a channel allocation request signal from a router that has received the beacon signal, selects a channel that is not used in another network and has no influence on peripheral channel interference in the channel descriptor managed by the coordinator, And transmitting the response signal to the corresponding router. The method for configuring an efficient multi-hop network in a TV harmful band environment.
3. The method of claim 2,
The router searching for a network that already exists in the TVWS band using a network search function;
Selecting an appropriate network to participate in using the network descriptor information obtained by the router as a result of the network search;
Receiving a beacon broadcast by the router from the selected network and performing a network joining process to synchronize the beacon; And
And allocating and assigning a channel to the coordinator or the upper router of the joined network and requesting a channel allocation from the router to the coordinator or the upper router of the joined network.
The method of claim 3,
When the router receives a channel allocation request from a lower router or a terminal device, the router transmits a channel allocation request signal to the coordinator managing the channel stripper through an upper router, and receives a channel allocation response signal from the upper router through the coordinator A method for configuring an efficient multi-hop network in a TV harmful band environment.
The method according to claim 1,
Allocating a new TV channel from the TVWS database server and dividing it into four PHY channels internally and adding it as a new channel descriptor when there is no more channel to be allocated in the channel descriptor managed by the coordinator; And
And selecting a channel again from the channel descriptor to which the coordinator is added, and transmitting the channel allocation to the first requesting router so as to be received.
A TVWS database server for managing available TV channel information; And
A coordinator for transmitting a network information request signal to the TVWS database server for network information acquisition and allocating an allocatable channel from the received channel information response signal upon receiving a network information response signal from the TVWS database server; And
And a router for selecting a channel of a connectable network using the descrambling information of the connectable network, requesting a channel allocation request signal, and allocating a multi-hop channel through the channel allocation response signal system.

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