KR20120076281A - Apparatus and method for providing wireless connection in smart utility network using white space - Google Patents

Abstract

PURPOSE: A wireless access providing apparatus in smart utility network operated as a television idle channel is provided to effectively use wireless traffic by transmitting various communication environment information, charging information, and real-time power consumption information. CONSTITUTION: An interference management information reception unit(201) receives interference management information which is necessary for managing the interference of one or more communication apparatuses. An interference management information analysis unit(202) calculates data including acquirable communication capacity, an interference reference value, an interference temperature, and interference temperature limit. A frequency band assignment unit(204) assigns available frequency band based one the calculated data and communication capacity requested by a secondary user.

Description

Apparatus and method for providing wireless connection in smart utility network using white space}

The present invention relates to an apparatus and method for providing a wireless connection in a smart utility network operating on a TV idle channel, and more specifically, to a transmission coverage area of a digital TV service (hereinafter, referred to as a 'DTV service') as a primary user. The present invention relates to an apparatus and method for providing a wireless connection to a smart meter terminal located in a smart utility network area of a smart grid.

Currently, candidates for wireless network communication networks in the smart grid smart utility network area include WPAN (Wireless Personal Area Network) series, WLAN (Wireless Local Area Network), Zigbee, and the like. WiBro is receiving attention. In particular, the US Spectrum Bridge is conducting a smart grid pilot project using TV idle channels through a business partnership with Google. 1 shows a smart utility network communication network constructed in a smart grid Jeju demonstration pilot complex.

Meanwhile, WPAN, WLAN, and Zigbee, which are typical methods of the local area network, are inefficient in increasing infrastructure construction costs and collecting and transmitting information generated from multiple wireless terminals and sensors in a smart utility network due to limitations in transmission distance and available bandwidth. There is a problem. In addition, the possibility of coexistence is reduced due to interference protection criteria of a predetermined transmitter reference, and the probability of interference for the primary user is expected to increase. Furthermore, the smart grid pilot project, which is managed by the Spectrum Bridge, is limited to buildings, industries, and subregions with very low population density, so that they can coexist in the urban environment where many heterogeneous wireless devices and sensors exist. There is a problem that the solution is not presented.

SUMMARY OF THE INVENTION The present invention provides a smart utility network operating in a TV idle channel capable of ensuring interference protection for a DTV service as a primary user existing in the smart utility network area and coexistence with other wireless smart meters. An apparatus and method for providing a wireless connection are provided.

Another technical problem to be solved by the present invention is smart that operates as a TV idle channel that can guarantee interference protection for DTV service as a primary user existing in the smart utility network area and coexistence with other wireless smart meters and wireless terminals. The present invention provides a computer-readable recording medium having recorded thereon a program for executing a wireless connection in a utility network.

In order to achieve the above technical problem, an apparatus for providing a wireless connection in a smart utility network operating on a TV idle channel according to the present invention is located within a transmission coverage area for a primary user of a data transmission service through a micro grid base station. An interference management information receiver configured to receive interference management information necessary for interference management from at least one of the communication devices; Based on the interference management information, the interference reference value, interference temperature, based on the interference probability value calculated through the interference analysis for the secondary user to communicate through the frequency band that can coexist with the primary user of the communication device, An interference management information analyzer for calculating data including an interference temperature limit value and an available communication capacity; And a frequency band allocator configured to allocate a frequency band usable by the secondary user based on the calculated data and the communication capacity required by the secondary user.

In order to achieve the above technical problem, a method for providing a wireless connection in a smart utility network operating on a TV idle channel according to the present invention is located within a transmission coverage area for a primary user of a data transmission service through a micro grid base station. An interference management information receiving step of receiving interference management information necessary for interference management from at least one of communication devices; Based on the interference management information, the interference reference value, interference temperature, based on the interference probability value calculated through the interference analysis for the secondary user to communicate through the frequency band that can coexist with the primary user of the communication device, An interference management information analysis step of calculating data including an interference temperature limit value and an obtainable communication capacity; And a frequency band allocation step of allocating a frequency band usable by the secondary user based on the calculated data and the communication capacity required by the secondary user.

According to the apparatus and method for providing a wireless connection in a smart utility network operating on a TV idle channel according to the present invention, it is possible to efficiently use wireless traffic generated due to transmission of real-time power consumption and charging information and various communication environment information. In addition, by securing the autonomous and reliable spectrum sharing technology standards beyond the existing rigid spectrum resource use concept, it is possible to reduce energy consumption, management costs for the spectrum resources, and infrastructure construction costs in national energy and frequency policy institutions. In addition, it is expected to maximize the utilization efficiency and supply of radio resources that can be prepared for future frequency shortages, and to reduce the cost of infrastructure construction by combining TV idle channel-based communication network that can save radio resources, energy and transmission coverage. Advancement and efficiency in the power sector can be achieved.

1 is a smart utility network communication network constructed in the smart grid Jeju demonstration pilot complex according to the present invention,
2 is a block diagram showing the configuration of a preferred embodiment of the apparatus for providing wireless access in a smart utility network operating on a TV idle channel according to the present invention;
3 is a diagram illustrating a connection relationship between respective devices configuring a smart utility network located in a DTV service area when a primary user is a DTV transmitter and a DTV receiver.
4 is a view showing the structure of a micro grid base station interworking white space database proposed in the present invention;
5 is a diagram illustrating an applicable DTV spectrum receiving environment and an interference tolerance criterion for an interference temperature model;
6A and 6B are diagrams illustrating a method of setting interference power limits from a transmitter perspective, which is a commercially available transmission power reference, respectively, and a method of setting interference temperature limits based on an interference temperature model used by the present invention. Drawings, and
7 is a flowchart illustrating a preferred embodiment of a method for providing a wireless connection at a micro grid base station in a smart utility network operating with a TV idle channel according to the present invention.

Hereinafter, a preferred embodiment of an apparatus and method for providing a wireless connection in a smart utility network operating on a TV idle channel according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing the configuration of a preferred embodiment of the apparatus for providing wireless access in a smart utility network operating on a TV idle channel according to the present invention.

Referring to FIG. 2, the apparatus for providing wireless access according to the present invention includes an interference management information receiver 201, an interference management information analyzer 202, a storage 203, and a frequency band allocator 204.

The interference management information receiver 201 receives interference management information necessary for interference management from at least one of communication devices located in a transmission coverage area for a primary user of a data transmission service through a micro grid base station.

Specifically, the interference management information transmitted to the interference management information receiver 201 includes location information of the primary user, reception power information from an interference source reaching the primary user, interference protection ratio information of the data transmission service, and primary user. Idle channel information may be included.

Next, the interference management information analysis unit 202 analyzes the interference for the secondary user who wants to communicate through a frequency band that can coexist with the primary user based on the interference management information received by the interference management information receiver 201. Based on the interference probability value calculated through the calculated data including the interference reference value, the interference temperature, the interference temperature limit value, the received power of the primary and secondary users and the available communication capacity.

Finally, the frequency band allocator 204 allocates a frequency band usable by the secondary user based on the data calculated by the interference management information analyzer 202 and the communication capacity required by the secondary user.

Meanwhile, the apparatus for providing wireless access according to the present invention may further include a storage unit 203 in which reference values preset by the communication service provider and the power service provider and information on the communication environment are stored for interference management. The interference management information analyzing unit 202 compares the interference management information received from the interference management information receiving unit 201 with the information stored in the storage unit 203 and allocates a frequency band in which the secondary user can coexist with the primary user. Determine whether you can receive. As a result of the comparison, if the interference management information satisfies the criteria stored in the storage unit 203, data for the second user described above is calculated.

The apparatus for providing wireless access according to the present invention described above may be applied to a DTV service. In this case, the primary user may be a DTV receiver that receives data with the DTV transmitter. In addition, the secondary user may be various communication devices to communicate through the idle channel.

FIG. 3 is a diagram illustrating a connection relationship between devices configuring a smart utility network located in a DTV service area when a primary user is a DTV transmitter and a DTV receiver.

Referring to FIG. 3, a beacon transmitter 330, a micro grid base station 340, a white space database (DTV transmitter 310), a DTV receiver 320, and a DTV receiver 320 interwork with the DTV transmission coverage 300. 350, a plurality of mobile smart meter terminals 360-1 to 360-3 including general notebooks and smartphones, fixed smart meters 370-1 to each of the home network area and the building network area, and the factory network area. 370-3).

Under such a network, the DTV receiver 320 as a primary user should be protected against interference effects from other transmitting wireless terminals 360-1 to 360-3, 370-1 to 370-3, except for the DTV transmitter 310. do. To this end, the apparatus for providing wireless access according to the present invention may perform interference management in association with the micro grid base station 340.

The beacon transmitter 330 receives the location information of the DTV receiver 320, the received power information from the interference sources 360-1 to 360-3, and 370-1 to 370-3 reaching the DTV receiver 320, and the DTV service. The interference management information including the interference protection ratio information of the interference and the idle channel information of the DTV receiver 320 in the smart utility network area, that is, the interference management information receiver of the wireless connection providing apparatus according to the invention It serves to deliver to 201.

Next, the interference management information analysis unit 202 stores the interference management information including TV idle channel information received from the beacon transmitter 330 and the data stored in the white space database 350, that is, the storage unit 203. Comparative analysis.

4 is a diagram illustrating a structure of a micro grid base station interworking white space database 350 proposed in the present invention.

Referring to FIG. 4, the white space database 350 is largely composed of two blocks.

The first block is a `` primary user frequency band database '' block 410 that can transmit and receive information with a database of telecommunication service providers and power service providers in the smart utility network area as well as the national frequency policy authority database.

Specifically, the information transmitted and stored from the communication service provider's database includes allowable transmission power, available frequency channels and C / I ratios, and the information transmitted and stored from the power service provider's database includes time-based supply power amount and CO2 emission standards. That is, in the 'primary user frequency band database' block 410, a predetermined criterion for storing a communication service is stored, and the interference management information analyzer 202 determines whether the communication devices satisfy these criteria.

The second block contains fixed and personal / portable smart meters (360-1 to 360-3, 370-1 to 370-3), beacons 330, and micros, including individual radios and sensors in the area of the smart utility network. A TV idle channel database for fixed, personal / mobile smart meters capable of transmitting and receiving information acquired from the grid base station 340 is a block 420.

In accordance with another aspect of the present invention, a wireless access providing apparatus includes a wireless device using a TV idle channel, including a DTV receiver 320, which is a primary user in a micro grid, in conjunction with a white space database 350 having a structure as shown in FIG. Pursuing optimal coexistence system without the influence of interference between sensor and smart meter will be pursued.

When it is determined that the secondary user can be allocated a frequency band as a result of comparing with the data stored in the database 350, the interference management information analysis unit 202 is a mobile smart meter terminal (360-1 to 360-3) and fixed type For each of the smart meters 370-1 to 370-3, the interference reference value based on the interference probability value calculated through the interference analysis, the interference temperature limit using the interference temperature model, the allowable transmission power, and the communication capacity are calculated.

The concept of interference temperature used in the present invention has been announced by the Spectrum Policy Task Force (SPTF) under the Federal Communications Commission (FCC), and the cognitive radio communication device is determined in advance. The interference limit is provided below to quantify and manage the amount of interference so that the secondary communication service user can coexist even in the frequency band of the primary communication service user. This is a concept of overcoming the complexity and ambiguity of a predetermined interference protection reference setting in a conventional radio transmitter and re-establishing the interference amount and interference reference value from the receiver's point of view in order to quantify the interference and obtain reliability of the interference reference.

The interference temperature includes all noises and interference signal types present in the interference environment scenarios considered, such as thermal noise, interference between the same and adjacent channels, and internal / external cell interference, and Boltzmann constant k obtained from the interference power P _I obtained from the receiving antenna. By dividing by and the bandwidth of the radio frequency (Radio Frequency) can be expressed as the following equation.

Where T _I is the interference temperature model, P _I is the interference power with the center frequency f _c , k is the Boltzmann constant, and B is the bandwidth of the corresponding radio frequency.

Figure 5 shows the applicable DTV spectrum receiving environment and the interference tolerance criteria for the interference temperature model.

In FIG. 5, P ₁ and P ₂ are DTV average reception powers in channel A and channel B regions, NF _A and NF _B are noise floors in channel A and channel B, respectively, and CI _{th , 1, A} And CI _{th , 2, B} are the DTV Carrier to Interference Ratio (C / I) in channel A and channel B, respectively.

Therefore, the interference temperature limit in the channel environment as shown in Figure 5 can be represented by the following equation.

P _{j , i} in Equation 2 means the received power from the interference source incident in the DTV receiver 320. That is, in Equation 2, P _{j , i} is the interference source reception power when the transmission power transmitted from the interference source transmitter corresponding to the index j and the interference source transmitter corresponding to the index i is incident on the DTV receiver 320. Indicates a value.

Equation 2 means that the received power from such an interference source should be less than the residual value due to the difference between the interference protection ratios CI _{th , i, C} and the noise floor NF _C at the DTV average received power value P _i . That is, the right side of Equation 2 is an interference power limit for interference protection of the DTV receiver 320. When this is converted into an interference temperature value according to Equation 1, it becomes an interference temperature limit value from the perspective of the DTV receiver 320.

FIG. 6A is a diagram illustrating a method for setting interference power limits from the perspective of a transmitter that is currently being used for transmission power. FIG. 6B is a diagram illustrating setting of interference temperature limits based on an interference temperature model by an apparatus for providing a wireless connection according to the present invention. A diagram illustrating the technique.

6A and 6B, it can be seen that the interference temperature limit setting method based on the interference temperature model used in the apparatus for providing wireless access according to the present invention is more efficient in terms of saving frequency resources than the conventional interference power limit setting method.

That is, referring to FIG. 6A, when the received power value by the interference source exceeds a predetermined power limit value, the DTV service user as the primary user and the smart meter communication service user as the secondary user may protect the interference on the DTV. Mutual coexistence is impossible.

On the other hand, as shown in FIG. 6B, in the interference protection method based on the interference temperature limit value, even if the received power value from the interference source exceeds the interference temperature limit value, the secondary user when the calculated interference temperature value is smaller than the interference temperature limit value. It can be seen that the smart meter can coexist with the existing DTV service. In addition, since the interference temperature and the interference temperature limit value are determined by the receiver, it is possible to obtain the reception power value of the interference source in consideration of the channel characteristics between the transceivers, and thus, there is an advantage that a more reliable and accurate interference protection criterion can be set. .

Equation 3 and Equation 4 define the received signal from the DTV transmitter and the received signal from the individual smart meter transmitter, respectively, received at the beacon transmitter linked with the DTV receiver.

The dRSS of Equation 3 refers to the received power from the DTV transmitter received by the DTV receiver, and the iRSS of Equation 4 refers to the received power from the smart meter transmitter and various wireless terminals incident to the same DTV receiver. In addition, in Equation 4, emission _it (f, f _vr ) represents a spectral radiation mask applied to a smart meter transmitter and various wireless terminals, and is defined as Equation 5 below.

Table 1 below describes the definitions of the parameters shown in Equations 3 to 5.

division Parameter Definition pl _{it ↔ vr} Path loss between smart meter transmitter and various wireless terminals and DTV receiver g _{it → vr} Antenna gain of smart meter transmitter and various wireless terminals facing DTV receiver g _{vr → it} Antenna gain of smart meter transmitter and DTV receiver towards various wireless terminals P _wt ^supplied Maximum transmit power supplied to the DTV transmitter antenna pl _{wt ↔ vr} Path Loss Between DTV Transmitter and DTV Receiver g _{wt → vr} Antenna gain of the DTV transmitter towards the DTV receiver g _{vr → wt} Antenna gain of the DTV receiver towards the DTV transmitter

Equations 6 and 7 are equations for limiting the interference temperature established based on the interference probability of about 3% and the carrier to interference ratio (C / I) required by the DTV service receiver 320, respectively.

In Equation 6 and Equation 7, k is Boltzmann constant, 1.38 × 10 ^-23 (Joules / kelbin), B is DTV reception bandwidth, IP _{3 % _ DTV} is 3% interference probability, CI _DTV is DTV service. Interference protection ratio, NF is noise floor.

The following equation is a formula for calculating the communication capacity that can be finally obtained in the individual smart meters 360-1 to 360-3 and 370-1 to 370-3 that can be obtained.

Where T _{lim _ 1} (f _i , B) is the interference temperature limit based on the 3% interference probability, and T _{lim _2} (f _i , B) is the interference temperature limit based on the C / I of the DTV, T _{interference_i} (f _i , B) is the interference temperature value that can be calculated at the smart meter receiver by the DTV transmitter transmission power, T _{interference_j} (f _i , B) is the interference temperature value that can be calculated at the DTV receiver by the smart meter transmission power, and NF is It's a noise floor.

The frequency band allocating unit 204 identifies the frequency bands available to each smart meter by the above-described process, and allocates the frequency bands within a range that does not affect the DTV receiver 320.

7 is a flowchart illustrating a preferred embodiment of a method for providing a wireless connection at a micro grid base station in a smart utility network operating with a TV idle channel according to the present invention.

Referring to FIG. 7, when the TV idle channel of the DTV receiver 320 is present, the interference management information receiver 201 in the micro grid base station may determine the TV idle channel information from the beacon transmitter 330, the location of the DTV receiver, and the occupancy information of the radio channel. Receive interference management information including the like (S701).

In addition, the interference management information receiving unit 201 is a communication capacity required to perform a data transmission service from the mobile smart meter terminals 360-1 to 360-3 and the fixed smart meters 370-1 to 370-3 which are secondary users. Obtain interference management information necessary for interference management, etc. (S701).

Thereafter, the interference management information analysis unit 202 compares the interference management information with reference values preset by the communication service provider and the power service provider and information on the communication environment to determine whether the reference value is satisfied (S702). ). Specifically, it is determined whether the C / I ratio, other interference protection, and energy saving criteria set for the DTV service are satisfied.

Specifically, the interference management information analysis unit 202 performs step S701 again when the interference management information does not satisfy the reference value stored in the storage unit 203, and when the reference value is satisfied, the individual smart meter 360 as the secondary user. -1 to 360-3, 370-1 to 370-3) based on the interference probability value calculated through the interference probability value, interference temperature, interference temperature limit value, the primary and secondary users receive power and obtainable Data including the communication capacity is calculated (S703).

 Next, the frequency band allocator 204 in the micro grid base station determines whether there is an available bandwidth, and then the communication required by the individual smart meters 360-1 to 360-3 and 370-1 to 370-3 as secondary users. An available frequency band is allocated to the secondary users 360-1 to 360-3 and 370-1 to 370-3 based on the capacity (S704).

On the contrary, if there is no available bandwidth, the frequency band allocator 204 performs the step S703 again after bonding the channels of the remaining TV idle channel candidate groups.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (transmission via the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the embodiment in which said invention is directed. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

Claims (9)

An interference management information receiver configured to receive interference management information necessary for interference management from at least one of communication devices located within a transmission coverage area for a first user of a data transmission service through a micro grid base station;
Based on the interference management information, the interference reference value, interference temperature, based on the interference probability value calculated through the interference analysis for the secondary user to communicate through the frequency band that can coexist with the primary user of the communication device An interference management information analyzer for calculating data including an interference temperature limit value and an available communication capacity; And
And a frequency band allocating unit for allocating a frequency band usable by the secondary user based on the calculated data and the communication capacity required by the secondary user. The method of claim 1,
Further comprising a storage unit for storing the information on the communication environment and the reference values preset by the communication service provider and power service provider for the interference management,
And the interference management information analyzing unit compares the interference management information with information stored in the storage unit and determines whether the secondary user can be allocated a frequency band. 3. The method according to claim 1 or 2,
The interference management information includes location information of the primary user collected by a beacon transmitter connected to the primary user, reception power information from an interference source reaching the primary user, and interference protection ratio information of the data transmission service. Include,
And the interference management information receiving unit receives the interference management information from the beacon transmitter when there is a frequency band that can coexist with the primary user. 3. The method according to claim 1 or 2,
And wherein the primary user is a receiver of a digital broadcast service, and the secondary user is a smart meter that performs wireless communication through a micro grid base station in a smart utility network area of a smart grid. An interference management information receiving step of receiving interference management information necessary for interference management from at least one of communication devices located in a transmission coverage area for a first user of a data transmission service through a micro grid base station;
Based on the interference management information, the interference reference value, interference temperature, based on the interference probability value calculated through the interference analysis for the secondary user to communicate through the frequency band that can coexist with the primary user of the communication device An interference management information analysis step of calculating data including an interference temperature limit value and an obtainable communication capacity; And
And assigning a frequency band usable by the secondary user based on the calculated data and the communication capacity required by the secondary user. 6. The method of claim 5,
In the interference management information analysis step, it is determined whether the secondary user can be assigned a frequency band by comparing the calculated data and information stored in the storage means,
And the information stored in the storage means includes reference values previously set by the communication service provider and the power service provider and information on the communication environment for interference management. The method according to claim 5 or 6,
The interference management information includes location information of the primary user collected by a beacon transmitter connected to the primary user, reception power information from an interference source reaching the primary user, and interference protection ratio information of the data transmission service. Include,
In the interference management information receiving step, if there is a frequency band that can coexist with the primary user, the wireless management providing method characterized in that for receiving the interference management information from the beacon transmitter. The method according to claim 5 or 6,
And wherein the primary user is a receiver of a digital broadcasting service, and the secondary user is a smart meter that performs wireless communication through a micro grid base station in a smart utility network area of a smart grid. A computer-readable recording medium having recorded thereon a program for executing the method for providing a wireless connection according to claim 5 or 6.

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