KR101403221B1 - System and method for measuring utility usage using ring communication architecture and ortho code in smart grid environment - Google Patents

Abstract

Disclosed is a system and a method for measuring utility usage using ring communication architecture and an ortho code. The utility usage of a subscriber is measured to obtain measured data, and the measured data is calculated by the ortho code to obtain calculated data. The calculated data is sent to a counting machine, and the measured data is restored based on the calculated data received from the counting machine, thereby billing for the utility usage to each subscriber according to the measured data. It is possible to prevent snooping attack, a modification attack, a masquerading attack, and replay attack, and less delay and low packet drop rate can be achieved. The system and the method for measuring utility usage can achieve a security goal including confidentiality, completeness, and a personal information protection policy.

Description

TECHNICAL FIELD The present invention relates to a system and method for measuring utility usage using a ring communication structure and a vertical code in a smart grid environment,

An efficient utility usage measurement system and method using a vertical code (Ortho Code) in a smart grid environment to protect subscriber's personal information based on a ring communication architecture (RCA) is disclosed.

The Smart Meter is a key facility for configuring the AMI together with communication systems that support heterogeneous network systems and interfaces in building the Advanced Metering Infrastructure (AMI). Meters are typically used to refer to weighing equipment for metering. Meters, as described in the Smart Grid System technology, are primarily watt-hour meters.

Smart metering technology is a future innovative technology that can overcome the limit of current centralized power supply network and can control pollution emission and improve power efficiency. , Which is a technology that replaces the change in power reception from the user's perspective on various power supply system environmental changes such as power consumption. It can be divided into Smart Meter and Intelligent Communication System if it is classified as a unit system as part of power information communication technology developed in connection with technologies such as IntelliGrid and Smart Grid.

Research related to metering data transmission system has been continued. For example, there is a prior art metering data transmission system, a method therefor, an apparatus therefor and a computer readable recording medium on which the method is recorded (Patent Publication No. 2013-0000062).

The present invention relates to a metering data transmission system, a method therefor, an apparatus therefor, and a computer-readable recording medium on which the method is recorded. The metering data can be verified by a variety of metering data according to the use of energy such as water, It can be collected by network topology. Accordingly, when the star network between the meter reading device and the relay device is constructed, the reliability of the metering data is increased, and the device cost can be reduced because the relay device does not need to implement its own routing function. In addition, the reliability of the collected metering data is improved by the management apparatus constructing a mesh type network with a plurality of relay apparatuses to collect metering data. The content of this prior art is that there is a risk that the measurement data is exposed to the attacker, which is insufficient to protect the personal information of the subscriber.

When the control center manages power distribution according to the subscriber's power usage, various privacy problems occur on a daily basis. The subscriber's power usage is automatically transmitted by the smart meter in the Smart Grid system. It is necessary to apply strong security technology to prevent data transmission such as power consumption from being exposed to an attacker. To this end, an efficient utility usage measurement system and method using a vertical code (Ortho Code) in a smart grid environment to protect subscriber's personal information based on RCA (Ring Communication Architecture) is disclosed.

According to one embodiment, measurement data is obtained by measuring utility usage of a subscriber, and calculation data is obtained by calculating measurement data with a vertical code. A ring communication structure for transmitting operation data to the aggregator, restoring the measurement data based on the operation data received through the aggregator, performing a utility billing for individual subscribers according to the measurement data, and a utility usage measurement system And a method are disclosed.

According to one embodiment, there is provided a smart meter for calculating measured data using a vertical code among configurations of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment.

According to one embodiment, a utility usage measurement system for one or more subscribers is connected to a ring topology network, wherein the utility usage measurement of one subscriber is measured to obtain measurement data, and the measurement data is computed And one or more smart meters for obtaining operational data. Vertical codes are assigned for each smart meter. And an aggregator for receiving operational data from a top-end smart meter connected to the ring topology network and operating the operational data using an aggregator vertical code. And a billing unit for receiving the operation data related to each smart meter from the aggregator, restoring the measurement data using the billing vertical code based on the operation data, and performing utility billing for individual subscribers according to the measurement data do.

According to one embodiment, a smart meter installed at a subscriber end in a utility usage measurement system for one or more subscribers includes a network adapter coupled to a ring topology network. And a calculating unit for measuring the utility usage of the subscriber and obtaining measurement data, and calculating the measurement data using the vertical code to obtain operation data. Wherein the utility usage measurement system is provided with two or more smart meters and each of the smart meters is assigned a respective vertical code and wherein the first smart meter of the utility usage measurement system transmits the first calculation data to the second smart meter, The second smart meter reconstructs the first calculation data received from the first smart meter and obtains the second calculation data by calculating the restored data and the second measurement data obtained from the second smart meter with the second vertical code.

According to another embodiment, a utility usage measurement method for one or more subscribers comprises the steps of: measuring utility usage of a subscriber to obtain measurement data; calculating measurement data with a vertical code to obtain operation data; Transmitting the calculation data to an aggregator, restoring the measurement data based on the calculation data received through the aggregator, performing utility billing for individual subscribers according to the measurement data, and at least two smart meters installed In a utility usage measurement system connected to a ring topology network and having a respective vertical code assigned to each of the smart meters, the first smart meter transmits the first calculation data to a second smart meter, The meter receives the first calculation data received from the first smart meter By calculating the second measurement data obtained in step and the restored data with the second smart meters to restore it to the second vertical code and a step of obtaining a second operation data.

A system and method for utility usage measurement using Ring Communication Architecture and Ortho Code in smart grid environment is presented.

It can prevent snooping attack, modification attack, masquerading attack, replaying attack, threatening Smart Grid, low delay and low packet drop rate ) Can be achieved.

Utility usage measurement systems and methods can achieve security objectives, including confidentiality, integrity and privacy policies.

1 is a block diagram showing a schematic configuration of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.
2 is a block diagram showing a schematic configuration of a smart meter in a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.
3 is a block diagram illustrating a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.
4 is a block diagram illustrating a payment transmission process in a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.
5 shows a vertical code of a smart meter according to an embodiment.
FIG. 6 is a view for explaining Step 3 shown in FIG. 3 in detail during a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an exemplary embodiment.
FIG. 7 is a view for explaining step 5 shown in FIG. 3 in detail during a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.
FIG. 8 is a view for explaining Step 7 shown in FIG. 3 in detail during a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

In the following, some embodiments, specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. The present invention is not limited to or limited by the embodiments.

Prior to this, terms and words used in the present specification and claims are to be interpreted in accordance with the technical idea of the present invention based on the principle that the inventor can properly define the concept of the term in order to explain his invention in the best way. It should be interpreted in terms of meaning and concept. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred. Like reference symbols in the drawings denote like elements.

1 is a block diagram showing a schematic configuration of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

Referring to FIG. 1, a utility usage measurement system 140 according to an exemplary embodiment of the present invention includes a smart meter 110, an aggregator 120, and a billing apparatus 130.

The smart meter 110 generally represents an electrical meter that records the consumption of electricity. The smart meter 110 communicates with the biller 130 over a period of time for monitoring and billing purposes at an hour or less time interval. Unlike an energy monitor in the home, the smart meter 110 can collect data remotely. These automatic meter readings are different from conventional automatic meter readings.

In the ring communication architecture (RCA), one smart meter 110 transmits data to the next smart meter 111 (there is one smart meter for each home). The smart meter 111 adds its data to the received data and sends the combined combined data to the next smart meter 112 until the smart meter 110 again transmits the data within the validity period. In the ring communication structure, the smart meter 110 transmits the received combined data to the aggregator 120.

The aggregator 120 receives the combined data transmitted from the selected smart meter 110 and transmits the data to the biller 130. [ The aggregator 120 may transmit the billing data computed at the billing machine 130 to the smart meter 110 via the selected smart meter 110.

The billing machine 130 receives the combined data collected by the smart meters 110, 111, 112, 113, and the like from the collector 120. Based on this combined data, the billing device 130 performs billing for each subscriber corresponding to each smart meter 110, 111, 112, 113, and so on. The billing machine 130 can transmit billing data to each smart meter 110, 111, 112, 113, etc. through the aggregator 120.

In the utility usage measurement system 140, the smart meter 110 is connected to a ring topology network, and measures utility usage of individual subscribers to obtain measurement data, calculates measurement data in a vertical code, . The ring topology network includes two or more smart meters 110. A vertical code is assigned to each smart meter 110, 111, 112, 113, and so on.

 The aggregator 120 receives the combined data from the smart meter 110 connected to the ring topology network and operates the aggregator 120 using the vertical code.

 The billing machine 130 receives the binding data associated with each smart meter from the aggregator 120, restores the measurement data using the biller 130 vertical code based on the binding data, And performs billing on utility usage by individual subscribers.

The smart meter 110 of the utility usage measurement system 140 transmits the first calculation data to the smart meter 111. The smart meter 111 restores the first calculation data received from the smart meter 110, The second measured data obtained by the smart meter 111 and the restored data are calculated by the second vertical code to obtain the second calculation data.

In the utility usage measurement system 140, n smart meters may be connected to the ring topology network, and the smart meter 110 receives the n-th operation data of the n-th smart meter 113, And transmits the n-th operation data and the digest to the aggregator 120. The aggregator 120 receives the n-th operation data and the digest. Smart meters can measure power usage at regular intervals.

In the utility usage measurement system 140, the smart meter 110 further calculates the combined data by using the security number shared with the billing machine 130. [ The aggregator 120 computes the combined data with a vertical code matrix to generate a new matrix, and calculates a second digest. The billing unit 130 generates utility data by using vertical codes to generate feedback data. The aggregator 120 receives the feedback data and transmits it to the smart meter 110 connected to the ring topology network. The smart meter 110 calculates the received feedback data using a vertical code to obtain billing data.

2 is a block diagram showing a schematic configuration of a smart meter in a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

2, the smart meter 210 according to an exemplary embodiment of the present invention includes a network adapter 211, a measurement unit 212, and an operation unit 213.

The network adapter 211 is connected to a ring topology network.

The measurement unit 212 measures the utility usage of the subscriber to obtain measurement data. The calculation unit 213 calculates the measurement data with the vertical code to obtain the calculation data.

The utility usage measurement system 140 may include more than one smart meter 210. Each of the smart meters 210 is assigned a respective vertical code and the smart meter 110 of the utility usage measurement system transmits the first calculation data to the smart meter 111, And restores the first calculation data received from the first calculator 110 and generates the second calculation data by calculating the restored data and the second measurement data obtained by the smart meter 111 with the second vertical code.

The calculation unit 213 calculates measurement data using a vertical code corresponding to the smart meter 110 and shifts the calculation result by a predetermined number of motion bits to the smart meter 110, And transmits the calculation result to the smart meter 111.

3 is a block diagram illustrating a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

A method for measuring utility usage for one or more subscribers, comprising: measuring utility usage of a subscriber to obtain measurement data; and calculating measurement data with a vertical code to obtain operational data. Transmits the calculation data to the aggregator, restores the measurement data based on the calculation data received through the aggregator, and performs utility billing for individual subscribers according to the measurement data.

More than one smart meter 110 may be connected to the ring topology network and each vertical meter is assigned a respective vertical code for each of the smart meters 110. The smart meter 110 transmits the first calculation data to the smart meter 111. The smart meter 111 restores the first calculation data received from the smart meter 110 and obtains the second calculation data by calculating the restored data and the second measurement data obtained by the smart meter 111 with the second vertical code .

The Walsh function based on the Hadamard code is one of the various methods of generating the vertical code. All codes in the Walsh code are orthogonal to each other. Each row is a Walsh code of size n. Generally, each subsequent step of the Hadamard matrix is generated from the previous step by Hadamard transform. The Hadamard matrix is calculated according to the following equation (1).

In the smart grid environment, the utility usage measurement system using the ring communication structure and the vertical code proposes an efficient structure and transmission mechanism to ensure the efficiency of the smart grid system and protect the subscriber's personal information. Before describing this transport mechanism, there are some noteworthy assumptions about utility usage measurement systems.

The utility usage measurement system includes a smart meter 310, an aggregator 320 and a billing machine 330. During the pre-distribution phase, it is assumed that all elements of the smart meter 310, the aggregator 320, and the billing machine 330 are secure, without being affected externally. At this stage, the aggregator 320 distributes the security number S to each smart meter 310, 340, 350, 360, and so on. The security number S may use a hash function to generate a digest between the smart meter 310 and the aggregator 320. The aggregator 320 also distributes the tables illustrated in Table 1 to each smart meter 310, 340, 350, 360, and so on. In the above table, there is a random integer related to each sequence index. The number of elements in the table is equal to the number of smart meters in the system.

The billing device 340 distributes the security number X and [Table 2] to each smart meter. [Table 2] is half the size of [Table 1].

Assume that the aggregator 320 and the billing machine 330 share a security number S. The security number S may use a hash function to generate a digest between the smart meter 310 and the aggregator 320.

To generate a vertical vector suitable for the proposed mechanism, Walsh function generation and Walsh code generation methods that generate a new vertical vector vertical code can be adopted.

 The vertical code comes from the Walsh code conversion style. The aggregator 320 first generates a vertical code matrix using Equation (1). The number of matrices is related to the number of smart meters 310 in this area. Second, transform the generated vertical code matrix. All 1s can be replaced by +1 in the Walsh code. All zeros can be replaced by -1. Aggregators randomly change the order of rows and columns and store them in the modified matrix. Finally, this stored matrix can be used as a vertical code matrix.

FIG. 5 shows an example of vertical code matrix generation.

The smart meter 310 is connected to a network of ring topologies. Each smart meter 310, 340, 350, 360, etc. knows the neighboring smart meter. The aggregator randomly selects the first smart meter and communicates with the first smart meter. The aggregator selects another smart meter that communicates with the first smart meter, as shown by the dashed line in FIG. The billing machine can communicate with the smart meter through the aggregator as shown in FIG.

Table 3 below lists notations and explanations to explain the mechanism.

Mark Explanation SM _i Smart meter i AGG House gauge U Billing machine M _i Measurement of smart meter i P _i Payment of smart meter i O _i Vertical code of smart meter i [O _AGG ] The vertical code matrix stored by the aggregator, each column of the matrix is the vertical code of each smart meter. x The security number is shared between the smart meter i and the billing machine. v _i Information is transmitted by the number of bits between smart meters. The number of bits is shifted and this value is obtained from Table 1. v _k ' Information is transmitted by the number of bits between the smart meter and the aggregator. The number of bits is shifted and is obtained from Table 2. Index v _i In Table 1, the index of the v _i value Index v _k ' In Table 2, the index of v _k ' <S> _{right_shift_b} Right shifts S by b bits <S> _{left_shift_b} shifts S by b bits to the left [O] _{up_shift_b} the matrix O is shifted up by b bits [O] _{down_shift_b} the matrix O is shifted down by b bits S ^left The left half of S S ^right The right half of S [O] ^left The left half of the matrix O [O] ^right The right half of matrix O Digest _(S) Digest S with hash function and security number n Number of smart meters in the system SN _{SM_AGG} Share security numbers between smart meter and house SN _{AGG_U} Share security numbers between aggregator and billing machine

3 again, the smart meter (SM _i ) 340 selected in step 1 311 adds the security number x to its measurement M _i , and the smart meter (SM _i ) _i + x) with the orthogonal code O _i . On the other hand, we randomly select the value of v _k from Table 1 above and transpose to the right by v _k bits (M _i + x) × O _i .

In step 2 312, the smart meter (SM _i ) 340 transmits the index of the selected v _k and the right transition result ( _Mi + x) X O _i to the next smart meter (SM _{i +1} ) do.

After receiving the information from the smart meter (SM _i ) 340 in Step 3 (313), confirm the stored Table 1 to find a value corresponding to v _k based on the received index. (M _i + x) × O _i by shifting left by v _k bits received (M _i + x) × O _i . To verify that the received information has been transformed, the smart meter (SM _{i + 1} ) 350 multiplies (M _i + x) x O _i by its vertical code O _{i +1} . If the result of (M _i + x) × O _i × O _{i +1} is zero, then the recovered information (M _i + x) × O _i can be used later. This means that the recovered information is not modified. This is because the two vertical codes O _i and O _{i +1} are perpendicular to each other. Otherwise, the multiplication result is not zero, and the restored result is dropped. In this case, the smart meter (SM _{i + 1} ) 350 requests the smart meter (SM _i ) 340 to resend the information. The smart meter (SM _{i + 1} ) 350 informs the aggregator 320 of an abnormal event. Smart meter _{(SM i + 1) (350} ) calculates the result of their (M _{i +1} + x) × O _{i +1,} and it _(i + M x) × O + _i (M _{i + 1} + x ) X O _{i +1} to the recovered result of smart meter (SM _i ) 340. To increase the security and confidentiality of this result, the smart meter (SM _{i +1} ) 350 randomly selects v _{k + 1} values from Table 1 and _adds v _{k +1} bits (M _i + x) x O _i + (M _{i +1} + x) x O _{i + 1} . The process of Step 3 (313) is shown in detail in FIG. FIG. 6 is a view for explaining Step 3 shown in FIG. 3 in detail during a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an exemplary embodiment.

In step 4 314, the smart meter SM _{i + 1} 350 transmits an index value of v _{k +1} and calculates (M _i + x) × O _i + (M _{i +1} + x) × O _{i + 1002} transmits the result to the smart meter _{(SM i +2) (360)} . The following smart meters all perform the same Step 3 (313) and Step 4 (314).

를 수신하고, 이 정보를 복원하기 위해 v_i 비트만큼 왼쪽으로 천이시킨다. 그리고

의 정확성을 확인하기 위해 부여된 수직코드 O_n을 곱한다. 선택된 스마트 미터기(SM_i)(340)는 무작위로 표 2로부터 v_i'값을 선택한다.

를 얻기 위해 v_i'비트만큼

의 오른쪽 절반을 오른쪽으로 천이시킨다. 선택된 스마트 미터기(SM_i)(340)은 도 7에 도시된 바와 같이 SN_{SM_AGG}보안번호를 공유한 해쉬함수를 이용하여 다이제스트를 계산한다. 도 7은 일실시예에 따른 스마트 그리드 환경에서 링 통신 구조와 수직코드를 사용한 유틸리티 사용량 측정 시스템의 구성의 측정 전송 프로세스 중에 도 3에 도시된 Step 5를 상세히 설명하는 도면이다.In step 5 (315), the smart meter (SM _i ) 340 receives the last smart meter

And to recover this information, v _i Transit to the left by a bit. And

Multiplied by a given vertical code, O _n , to verify the accuracy of. The selected smart meter (SM _i ) 340 randomly selects the value v _i 'from Table 2.

Lt; _{RTI ID = 0.0} &gt; v &apos;

To the right. The selected smart meter (SM _i ) 340 calculates the digest using a hash function that shares the SN _{SM_AGG} security number as shown in FIG. FIG. 7 is a view for explaining step 5 shown in FIG. 3 in detail during a measurement transmission process of a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

In step 6 (316), the smart meter (SM _i ) 340 sends the following information to the aggregator.

를 곱한다. 그리고 나서 n으로 나눈다. n은 수직코드의 크기이다. 계산되는 과정은 [수학식 2]와 같다.When receiving information from the smart meter (SM _i ) 340 at step 7 (317), the aggregator 320 first uses the hash function to verify the digest and share the security number _{SM_AGG} . If the information is inaccurate, the aggregator 320 drops the information and requests retransmission to the selected smart meter (SM _i ) 340. If the information is correct, the aggregator 320 uses the left half of the stored vertical code matrix [O _AGG ] ^left

Lt; / RTI &gt; Then divide by n. n is the size of the vertical code. The calculation process is as shown in [Equation 2].

After obtaining n, which is the (M _i + x) portion of each smart meter 310, 340, 350, 360, etc. through this process, the aggregator 320 uses this n value to calculate the left half . Then, a new matrix [O _AGG - new] is obtained with a size of n × (n / 2 + 1).

와

를 얻기 위해 p비트만큼 새로운 행렬의 오른쪽 절반을 천이시키고 q비트만큼 위/아래 천이한다. 이러한 변화는 [표 4]과 같이 설명된다. 집계기(320)는 모든 정보의 다이제스트를 계산한다. 정보는 도 8에서처럼 보안번호 S_{AGG_U}를 공유한 해쉬함수에 의해 과금기(330)로 전송된다.The aggregator (320)

Wow

The right half of the new matrix is shifted by p bits and shifted up / down by q bits. These changes are explained in [Table 4]. The aggregator 320 calculates a digest of all information. The information is transmitted to the accounting unit 330 by a hash function that shares the security number S _{AGG_U} as shown in FIG.

In step 8 (318), the aggregator 320 transmits the following information to the billing machine 330.

After Step 9 (319) received information from the aggregator (320) billing period (330) checks the digest using the first security code S _{AGG _U} shared with the hash function. If the computed digest differs from the received digest, the biller 330 drops the received information and requests retransmission to the aggregator 320. If the digest is correct, the received information is used later. Multiply the recovered information from the right half of the received matrix and divide the product by the size of the original vertical code n. The calculation procedure is as shown in Equation (3).

과 더하고, 비밀 번호 x에 의해 각각의 이러한 결과를 공제(subtract)한다. [수학식 4]에서는 상기 계산된 값은 nSMs를 측정값과 같음을 보여준다.The billing unit 330 receives the above result

And subtracts each of these results by the password x. In Equation (4), the calculated value is equal to the measured value of nSMs.

4 is a block diagram illustrating a payment transmission process in a configuration of a utility usage measurement system using a ring communication structure and a vertical code in a smart grid environment according to an embodiment.

In the payment transfer process, the billing machine 430 can generate the payment based on the received measurement. The billing unit 430 sends the payment information to each smart meter 440 through the aggregator using the receiving half of the vertical code matrix to produce a summation result associated with the portion of the payment in the measurement transfer process. The aggregator 420 uses the entire vertical code to generate another summation result associated with the other part of the payment. Based on the two payment summations, each smart meter 440 can recover the payment by its vertical code. The transmission process can be seen in FIG. 4, and each step is described as follows.

이다. 과금기(430)는 수신한 수직코드 s 행렬

를 두 그룹으로 나눈다. 하나의 그룹은 위쪽 반이다. 즉,

이다. 다른 그룹은 아래쪽 반이다. 즉,

이다. 이러한 두 행렬의 크기는 n/2×n/2이다. 각 그룹에서, 수직코드는 서로 직교한다. (Pi+x)^part2의 각 값은 대응하는 수직코드

에 의해 곱해질 수 있다. 그리고 이 코드를 사용하여 유틸리티는 M_i를 계산한다. 이미 결정된 같은 부분에서 대응하는 수직코드의 결과는 합해진다. 그리고 이러한 두 합산 과정의 계산은 다음과 같다.In step 410, the billing processor 430 may calculate Pi based on each measurement M _i . You can also add these measurements by security number x. Divide each result (Pi + x) into two parts. In other words,

to be. The billing machine 430 receives the received vertical code s matrix

Into two groups. One group is the upper half. In other words,

to be. The other group is the bottom half. In other words,

to be. The size of these two matrices is n / 2 x n / 2. In each group, the vertical codes are orthogonal to each other. (Pi + x) Each value of ^part2 corresponds to a corresponding vertical code

. &Lt; / RTI &gt; Using this code, the utility computes M _i . The result of the corresponding vertical code in the same part already determined is summed. The calculation of these two summation processes is as follows.

The billing machine 430 randomly finds v2 'in Table 2. And shifts the two summations to the left by v2 'bits. The billing apparatus 430 uses a hash function and a security number S _{AGG_U} that are shared to generate a digest.

, [(P_i+x)^part1] 값의 첫 번째 부분, 표2에서 v2'와 관련된 인덱스, 집계기(420)로부터 수신한 타임스탬프 및 다이제스트 결과를 집계기(420)에 전송한다.In step 11 (411), the billing machine 430 generates a vertical code list in two groups, List ^up and List ^down ,

, The index associated with v2 'in Table 2, the first portion of the [(P _i + x) part ¹ ] value, the timestamp received from aggregator 420 and the digest result to aggregator 420.

In step 12 (412), the aggregator 420 verifies the accuracy of the information received by the digest. The aggregator 420 retrieves a timestamp in Table 4 to find the vertical code matrix associated with the received information. Based on the received List ^up and List ^down , the aggregator 420 can sum ^up and sum ^{down the} original vertical code. The aggregator multiplies the first part of each (P _i + x) part ¹ payment corresponding to the original vertical code O _i . The accumulator 420 adds these multiplication results respectively. Based on the changes shown in Table 4, the aggregator 420 transitions the received sum to the left / right. The aggregator 420 generates a new list of relationships between the smart meters 440. Then, the two summations are calculated based on List ^up and List ^down .

At step 13 (413), the information is sent to the smart meter (440) selected by the aggregator (420).

The smart meter 440 selected at step 14 (414) checks the digest and refers to Table 2. Referring to Table 2, based on the index v2 ', finds the number v2' and shifts two sums received by v2 'bits to the right. Then the smart meter 440 is multiplied by the information received by their vertical code O _i. And divide by n to recover the first part of your payment. The calculation process is similar to Step 7 (317) of the measurement transfer process shown in Fig. The smart meter 440 identifies the received list to find the corresponding summation. Then multiply this sum by the right half of your vertical code. The smart meter 440 adds these two results. And then subtracts P _i + x by the security number x to get his billing data.

를 전송한다.In step 15 (415), the smart meter 440 is connected to the smart meter 450

.

The smart meter (460, etc.) repeats Step 14 (414) and Step 15 (415) until the first smart meter (440) receives the information again in Step 16 (416). The smart meter 440 then compares the two pieces of information (e.g., the information received from the last smart meter 460). If the received information is the same as the exported information, smart meter 440 may store the calculated payment to all smart meters (450, 460, etc.). If the received information is different from the exported information, the smart meter 440 informs all smart meters that the calculated payment (450, 460, etc.) is incorrect and should be dropped. Meanwhile, the smart meter 440 retransmits the next smart meter information received in Step 15 (415).

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: Utility usage measurement system
110, 111, 112, 113: Smart meter
120: House instrument
130: billing machine
210: Smart meter
211: Network adapter
212:
213:
310, 340, 350, 360: Smart meter
320: house instrument
330: billing machine
420: house instrument
430: billing machine
440, 450, 460: Smart meter

Claims (10)

In a utility usage measurement system for one or more subscribers,
One or more smart meters connected to a ring topology network for measuring utility usage of individual subscribers to obtain measurement data and computing said measurement data with a vertical code to obtain operational data, said vertical codes being allocated for each of said smart meters has exist -;
An aggregator for receiving the operation data from a smart-end smart meter connected to the ring topology network and operating the operation data using an aggregator vertical code; And
Receiving the calculation data associated with each smart meter from the aggregator, restoring the measurement data using a billing vertical code based on the calculation data, and, in response to the measurement data, Billing machine
The utility usage measurement system. The method according to claim 1,
Wherein the first smart meter of the utility usage measurement system transmits first calculation data to a second smart meter and the second smart meter restores the first calculation data received from the first smart meter, Data obtained by the first smart meter and second measurement data obtained by the second smart meter with a second vertical code to obtain second calculation data. 3. The method of claim 2,
In the ring topology network, n smart meters are connected,
Wherein the first smart meter receives the nth operation data of the nth smart meter, calculates a digest using the selected security number, and transmits the nth operation data and the digest to the aggregator. The method according to claim 1,
Wherein the smart meter measures a power consumption amount at a predetermined time interval
Utility usage measurement system. The method according to claim 1,
Wherein the smart meter calculates the operation data by further using a security number shared with the billing machine. The method according to claim 1,
Wherein the aggregator computes the operation data with a vertical code matrix to generate a new matrix, and calculates a second digest. The method according to claim 1,
Wherein the billing unit generates the utility billing related data performed for the individual subscriber by using the vertical code,
Wherein the aggregator receives the feedback data and transmits the feedback data to the smart meter connected to the ring topology network. In a utility meter measurement system for one or more subscribers, a smart meter installed at the subscriber terminal,
A network adapter connected to a ring topology network;
A measurement unit for measuring the utility usage of the subscriber to obtain measurement data; And
And an arithmetic unit for calculating the measurement data with a vertical code to obtain arithmetic data,
Wherein the utility usage measurement system is provided with two or more smart meters, each of the smart meters being assigned a respective vertical code, and wherein the first smart meter of the utility usage measurement system is operable to transmit the first calculation data to a second smart meter And the second smart meter restores the first calculation data received from the first smart meter and calculates the second measurement data obtained from the second smart meter and the restored data with a second vertical code Smart meter to obtain second calculation data. 9. The method of claim 8,
The calculation unit calculates the measurement data using a vertical code corresponding to the smart meter, transits the calculation result to the smart meter by a predetermined number of mobile bits, and transmits the result of the shifting to the second smart meter Smart meter. A method of measuring utility usage for one or more subscribers,
Measuring utility usage of the subscriber to obtain measurement data;
Calculating the measurement data with a vertical code to obtain operation data;
Transmitting the operation data to an aggregator;
Restoring the measurement data based on the calculation data received through the aggregator, and performing utility billing for the individual subscriber according to the measurement data;
In the utility usage measurement system, in which two or more smart meters are installed and connected to a ring topology network, and each of the smart meters is assigned a respective vertical code, the first smart meter transmits the first calculation data to the second smart meter ;
Wherein the second smart meter comprises: restoring the first calculation data received from the first smart meter; And
And obtaining the second calculation data by calculating the restored data and the second measurement data obtained from the second smart meter with a second vertical code.

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