Mobile network spectrum sharing optimization method based on block chain and crowdsourcing monitoring

Abstract

The invention provides a mobile network spectrum sharing optimization method based on a block chain and crowdsourcing monitoring, and the method comprises the following steps: building a mobile network spectrum sharing system based on the block chain and crowdsourcing monitoring, the system architecture of the established mobile network spectrum sharing system based on the block chain and crowdsourcing monitoring comprises a block chain network, an MNO base station, crowdsourcing users CUs and common users. Transacting in the spectrum; in the frequency spectrum monitoring stage, a crowdsourcing monitoring process is adopted.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technology, and in particular to a method for optimizing spectrum sharing in a mobile network. The method utilizes blockchain technology and a crowdsourcing monitoring mechanism to improve the security and effectiveness of spectrum sharing. Background Art

[0002] Spectrum is a scarce resource in mobile networks, especially for 5G and future network technologies that are designed to support high bandwidth requirements. The demand for spectrum resources is growing. In order to cope with the scarcity of spectrum resources, spectrum sharing technology is seen as an effective solution. However, most existing spectrum sharing technologies adopt a centralized architecture, such as relying on third-party organizations or central databases to manage spectrum transactions between mobile network operators (MNOs). These centralized solutions have risks such as single point failure (SPF), denial of service (DoS) attacks and privacy leaks.

[0003] Blockchain technology, with its decentralized characteristics, data immutability, traceability, and automatic execution of smart contracts, is considered to be an effective way to solve the problems existing in centralized spectrum sharing solutions. In existing research, blockchain is used as an immutable database for spectrum sharing transactions. By building a distributed, secure, and transparent spectrum trading blockchain platform, spectrum trading can be realized, the utilization efficiency of spectrum resources can be improved, management costs can be reduced, and the system's anti-attack capability can be enhanced.

[0004] Nevertheless, due to the weak coupling between the blockchain system and the mobile network, the current solution fails to effectively record contract violations after the spectrum transaction is completed, such as the illegal use of the spectrum within the contract scope by an MNO that does not have the spectrum use rights during the contract performance period. Therefore, in the existing blockchain-based spectrum sharing solution, although spectrum transactions can be completed safely and transparently, there is a lack of reliable evidence support when dealing with violations during the contract performance period after the transaction is completed, which seriously affects the effectiveness and reliability of spectrum sharing. Summary of the invention

[0005] The present invention provides a method for optimizing spectrum sharing in a mobile network, aiming to effectively record evidence of contract violations after spectrum trading, so as to optimize the implementation effect of spectrum sharing. The technical solution of the present invention is as follows:

[0006] A method for optimizing mobile network spectrum sharing based on blockchain and crowdsourcing monitoring, comprising the following steps:

[0007] (1) Establishing a mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring, wherein the system architecture of the mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring includes a blockchain network, MNO base stations, crowdsourcing users CUs and ordinary users; wherein the MNO base stations belong to the primary operators POs or the secondary operators SOs, respectively, and an edge server is deployed at the location of each MNO base station as a blockchain node, and the blockchain nodes form a blockchain network; the mobile network spectrum sharing system allows:

[0008] 1) In the spectrum trading stage, the primary operators (POs) with idle spectrum can rent out their idle spectrum resources to the secondary operators (SOs) with spectrum demand on the blockchain network;

[0009] 2) In the spectrum monitoring phase, SOs will use the blockchain network to call pre-deployed smart contracts to automatically monitor spectrum usage; the smart contract is responsible for publishing and managing crowdsourced monitoring tasks, and crowdsourced users CUs are free to choose whether to accept the crowdsourced monitoring tasks;

[0010] (II) During the spectrum trading phase, the spectrum trading process is as follows:

[0011] (1) Exchange for tokens;

[0012] (2) SOs submit lease applications;

[0013] (3) POs lease spectrum;

[0014] (4) reaching a transaction;

[0015] (III) During the spectrum monitoring phase, the crowdsourcing monitoring process is as follows:

[0016] (1) Before issuing a crowdsourcing monitoring task, the system information broadcast by the 5G base station is encrypted and the digital signature generated by SIB1 and SIB9 is embedded into the system information broadcast by the 5G base station;

[0017] (2) S0s calls a smart contract containing a crowdsourced monitoring task on the blockchain network to publish a crowdsourced monitoring task, including the spectrum range to be monitored, the geographical location, the duration of monitoring, and the reward for CUs; ​​CUs interested in the task in the target location confirm their acceptance of the crowdsourced monitoring task by sending a transaction on the blockchain network and monitor the MNO base stations in the corresponding task; the transaction will be processed by the smart contract, and the public key and corresponding account of the CUs will be recorded in the task recipient list;

[0018] (3) When CUs receive the system information broadcast by the 5G base station, they verify the digital signature and report the system information broadcast by the 5G base station as evidence to the blockchain network if there is any contract violation;

[0019] (4) After CUs send the evidence with their own digital signatures to the blockchain network, each blockchain node needs to reach a consensus on whether the evidence is valid; if the evidence is considered valid according to the consensus, the relevant smart contract will automatically execute two types of transactions: one is to punish by transferring a certain number of tokens from the MNOs account that has contract violations in the crowdsourced monitoring task to the S0s account that issued the crowdsourced monitoring task; the other is to transfer a certain number of tokens to the CUs account as a reward.

[0020] Furthermore, in the spectrum trading stage, the spectrum trading process is as follows:

[0021] (1) Exchange for tokens

[0022] Before spectrum trading, the relevant MNO base stations obtain specific digital assets, namely tokens, from financial institutions to be used as a means of payment in spectrum trading; each MNO base station has an independent account address, which is used to store tokens issued by financial institutions;

[0023] (2) SOs submit lease applications

[0024] SOs submit spectrum leasing applications in the blockchain network. The application content includes detailed information such as the required spectrum range, geographical location, leasing time period, leasing quotation and validity period of the leasing application. The leasing application is digitally signed by SOs and issued in the form of a transaction. The blockchain node needs to verify the validity of the leasing application, including but not limited to checking the rationality of the spectrum range, geographical location and leasing time period. In addition, once the time exceeds the validity period of the leasing application, the leasing application will automatically become invalid.

[0025] (3) POs lease spectrum

[0026] POs query the spectrum leasing application in the blockchain network, or directly publish the information of leasing spectrum through the blockchain network according to their own leasing needs; the information of leasing spectrum includes but is not limited to the spectrum range, geographical location, leasing time period, leasing quotation and the effective time limit of leasing spectrum; blockchain nodes need to verify the information of leasing spectrum, including but not limited to confirming that the leased spectrum is indeed owned by POs, and the rationality of the leasing time period and geographical location; if the information of leasing spectrum is not leased within the prescribed effective time limit, the information of leasing spectrum will automatically become invalid;

[0027] (4) Transaction conclusion

[0028] After the blockchain network collects the leasing applications or spectrum lease information of each MNO base station, the relevant smart contract will automatically execute the matching process to reach a spectrum transaction and complete the token transfer process. Then, SOs use the spectrum resources leased by POs according to the contract.

[0029] Furthermore, the NCGI, frequencyInfoDL, frequencyInfoUL and UTC information carried by the SIB1 and SIB9 system information broadcast by the 5G base station are used for the encryption design of the system information broadcast by the 5G base station.

[0030] Furthermore, the system information broadcast by the 5G base station is encrypted and designed, and the method of embedding the digital signature of each MNO base station into the system information broadcast by the 5G base station is as follows:

[0031] Each MNO base station deploys a private key generator PKG, which can generate a unique MNO private key SK O , Generate the MNO public key PK based on elliptic curve cryptography ECC O :

[0032] PK O =SK O ·G

[0033] Where G is the base point on the elliptic curve;

[0034] According to NCGI, SK O and PK O Generate a private key SK for each MNO base station ID and PK ID ;

[0035] SK ID =SK O NCGI

[0036] PK ID =PK O NCGI

[0037] Each MNO base station retains its SK ID , while PK O The PK is stored in the blockchain network. After CUs access the blockchain network, they can directly query the PK from the blockchain network. O .

[0038] Furthermore, each MNO base station performs the following process to complete the digital signature embedding process:

[0039] 1) Concatenate SIB1 and SIB9 into a single string S;

[0040] 2) Generate a digital signature using a digital signature generation algorithm;

[0041] 3) Insert digital signatures into unused fields of system information broadcast by 5G base stations

[0042] Furthermore, CUs receives the system information broadcast by the 5G base station and verifies the digital signature in the following steps:

[0043] 1) Concatenate SIB1 and SIB9 in the system information broadcast by the received 5G base station into a single string S';

[0044] 2) Get NCGI from SIB1, and then based on PK O Calculate PK ID ;

[0045] 3) Using S' and PK ID To verify whether the digital signature is valid, if not valid, it proves that the system information broadcast by the 5G base station is sent by a fake base station, and it is directly discarded, and then continue monitoring until the crowdsourcing monitoring task is completed; if valid, the CUs confirm that the system information broadcast by the 5G base station is sent from a base station with a specific NCGI, and then proceed to 4)

[0046] 4) CUs parse the sending time of the system information broadcast by the 5G base station and the spectrum range used from SIB1 and SIB9, and judge whether the MNO has illegally allocated illegal spectrum at the current time based on the crowdsourcing monitoring task; if there is a contract violation, CUs reports the system information broadcast by the 5G base station as evidence to the blockchain network, and then continues to monitor until the crowdsourcing monitoring task is completed.

[0047] The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring provided by the present invention automates the transaction process by deploying a smart contract specifically responsible for spectrum transactions on the blockchain, and ensures the integrity and authenticity of transaction records by leveraging the tamper-proof nature of the blockchain. In addition, the present invention also proposes to utilize the wide distribution and high flexibility of crowdsourcing users to collect evidence of illegal spectrum use after the transaction is completed by monitoring the system information broadcast by 5G base stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is an example diagram of the architecture of a mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring. DETAILED DESCRIPTION

[0049] The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring of the present invention comprises the following steps:

[0050] 1. The present invention proposes to establish a mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring (hereinafter referred to as the system). The system allows

[0051] 1) In the spectrum trading stage, primary operators (POs) with idle spectrum can rent out their idle spectrum resources to secondary operators (SOs) with spectrum needs on the blockchain network. The specific spectrum trading process is shown in step 2.

[0052] 2) In the spectrum monitoring phase, SOs will use the blockchain network to call pre-deployed smart contracts to automatically monitor spectrum usage. The smart contract is responsible for publishing and managing crowdsourcing monitoring tasks, and crowdsourcing users (CUs) can freely choose whether to accept these tasks. The specific crowdsourcing monitoring process is shown in step 3.

[0053] The system architecture consists of blockchain network, MNO base stations, crowdsourcing users and ordinary users. Figure 1 For example, in area A, there are three MNO base stations, belonging to PO, SO1 and SO2 respectively. An edge server is deployed at each base station as a blockchain node. The three blockchain nodes form a blockchain network. In addition, there are two crowdsourcing users (CU1 and CU2) and a large number of ordinary users. In the spectrum trading stage, PO rents its idle spectrum to SO1 on the blockchain network; in the spectrum monitoring stage, SO1 calls the relevant smart contract on the blockchain network to publish crowdsourcing monitoring tasks. CU1 and CU2 accept the task and monitor PO and SO2 respectively.

[0054] 2. During the spectrum trading phase, the spectrum trading process is as follows:

[0055] (1) Exchange for tokens

[0056] Before spectrum trading, the relevant MNOs need to obtain specific digital assets, namely tokens, from financial institutions. These tokens are used as a means of payment in spectrum trading. Each MNO has an independent account address, which acts as an electronic wallet to store tokens issued by financial institutions. These tokens can not only be used for spectrum trading, but can also be exchanged for legal currency at financial institutions.

[0057] (2) Rental Application

[0058] SOs submit spectrum leasing applications in the blockchain network. The application content includes detailed information such as the required spectrum range, geographical location, leasing time period, leasing quotation and validity period of the leasing application. The leasing application is digitally signed by SOs and issued in the form of a transaction. Blockchain nodes need to verify the validity of the leasing application, including but not limited to checking the rationality of the spectrum range, geographical location and leasing time period. In addition, once the time exceeds the validity period of the leasing application, the leasing application will automatically expire.

[0059] (3) Lease of spectrum

[0060] POs can query spectrum leasing applications in the blockchain network, or directly publish spectrum leasing information through the blockchain network based on their own leasing needs. This leasing information includes, but is not limited to, key parameters such as spectrum range, geographic location, leasing time period, leasing quotation, and effective time limit of the leased spectrum. Blockchain nodes need to verify the information of the leased spectrum, including but not limited to confirming that the leased spectrum is indeed owned by POs, and the rationality of the leasing time period and geographic location. If the information of the leased spectrum is not leased within the prescribed effective time limit, the information of the leased spectrum will automatically become invalid.

[0061] (4) Transaction conclusion

[0062] After the blockchain network collects the information of each MNO's leasing application or spectrum lease, the relevant smart contract will automatically execute the matching process to reach a spectrum transaction and complete the token transfer process. Then, SOs can use the spectrum resources leased by POs according to the contract provisions.

[0063] 3. In the spectrum monitoring stage, the crowdsourcing monitoring process is as follows:

[0064] (1) In order to complete the crowdsourcing monitoring task, the present invention proposes that before issuing the crowdsourcing monitoring task, the system information broadcast by the 5G base station should be encrypted, that is, the digital signature of each MNO base station should be embedded in the system information broadcast by the 5G base station.

[0065] Specifically, the system information broadcast by the 5G base station is broadcast by the 5G base station to all users in the service cell, providing key information for users to access the network. Among the system information broadcast by the 5G base station, there are two special system information, namely System Information Block Type 1 (SIB1) and System Information Block Type 9 (SIB9). Among them, SIB1 contains the 5G cell global identifier (NCGI, NR CellGlobal Identifier), which is a unique identifier for each 5G base station cell. In addition, SIB1 also includes frequencyInfoDL and frequencyInfoUL, which can be used to calculate the downlink and uplink spectrum resource allocation of the cell, while SIB9 carries UTC (Coodinated Universal Time) time information.

[0066] The information carried by the above SIB1 and SIB9 can be used for the system information encryption design broadcast by 5G base stations. In the specific design, each MNO deploys a private key generator (PKG, Private Key Generator), which can generate a unique MNO private key SK O , and then generate the MNO public key based on elliptic curve cryptography (ECC):

[0067] PK O =SK O ·G

[0068] Here, G is the base point on the elliptic curve. Next, we can use NCGI, SK O and PK O Generate a private key SK for each base station ID and PK ID .

[0069] SK ID =SK O NCGI

[0070] PK ID =PK O NCGI

[0071] We make each base station keep its SK ID , while PK O It is stored in the blockchain network (PK is not stored here). ID , but store PK O This is because there are too many base stations. If each PK ID It will take up too much storage space. On the contrary, each MNO's PK O There is only one), after CUs access the blockchain network, they can directly query PK from the blockchain network O .

[0072] Next, we propose to embed the digital signature generated by SIB1 and SIB9 into the system information broadcast by 5G base stations. Each base station needs to perform the following procedures to complete the digital signature embedding process:

[0073] 1) Concatenate SIB1 and SIB9 into a single string S;

[0074] 2) Use a digital signature generation algorithm (such as ECDSA) to generate a digital signature (r, s), for example (r, s) = ECDSA (S, SK ID );

[0075] 3) Insert (r, s) into an unused field of the system information broadcast by the 5G base station (for example, if ECDSA is used, the length of (r, s) is 40 bytes, where r and s each consist of a 20-byte value).

[0076] (2) After encrypting the system information broadcast by the 5G base station, S0s will call a crowdsourced monitoring task on the blockchain network, including the spectrum range to be monitored, the geographical location, the duration of monitoring, and the reward for CUs. CUs that are within the target location and interested in the task can confirm their acceptance of the crowdsourced monitoring task by sending a transaction on the blockchain network. The transaction will be processed by the smart contract, and the public key and corresponding account of the CUs will be recorded in the task recipient list.

[0077] (3) When CUs receive the system information broadcast by the 5G base station, they can verify the digital signature through the following steps:

[0078] 1) Concatenate SIB1 and SIB9 in the system information broadcast by the received 5G base station into a single string S';

[0079] 2) Get NCGI from SIB1, and then based on PK O Calculate PK ID ;

[0080] 3) Using S' and PK ID To verify whether (r, s) is valid. If not, it proves that the system information broadcast by the 5G base station is sent by a fake base station, which can be directly discarded, and then continue monitoring until the crowdsourcing monitoring task is completed. If valid, CUs can confirm that the system information broadcast by the 5G base station is sent from a base station with a specific NCGI, and then proceed to 4)

[0081] 4) CUs parse the time of sending the system information broadcast by the 5G base station and the spectrum range used from SIB1 and SIB9, and judge whether the MNO has illegally allocated illegal spectrum at the current time according to the crowdsourcing monitoring task. If there is a contract violation, CUs immediately report the system information broadcast by the 5G base station as evidence to the blockchain network, and then continue to monitor until the crowdsourcing monitoring task is completed.

[0082] (4) After CUs send the evidence with their own digital signatures to the blockchain network, each blockchain node needs to reach a consensus on whether the evidence is valid. If the evidence is considered valid according to the consensus, the relevant smart contract will automatically execute two types of transactions. One is to punish the MNO by transferring a certain number of tokens from the MNO account with contract violations to the S0s account. The other is to transfer a certain number of tokens to the CUs account as a reward.

[0083] By embedding the digital signature of the 5G base station into the system information it broadcasts, the present invention can determine the identity of the transmitter of the system information and can record the evidence of the MNO's illegal use of spectrum on the blockchain network in an undeniable manner, thereby enhancing the effectiveness and reliability of spectrum sharing.

Claims

1. A method for optimizing mobile network spectrum sharing based on blockchain and crowdsourcing monitoring, comprising the following steps: (1) establishing a mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring, wherein the system architecture of the mobile network spectrum sharing system based on blockchain and crowdsourcing monitoring includes a blockchain network, MNO base stations, crowdsourcing users CUs and ordinary users; wherein: MNO base stations belong to primary operators POs or secondary operators SOs. An edge server is deployed at each MNO base station location as a blockchain node, and a blockchain network is formed by blockchain nodes. This mobile network spectrum sharing system allows: 1) In the spectrum trading stage, the primary operators (POs) with idle spectrum can rent out their idle spectrum resources to the secondary operators (SOs) with spectrum demand on the blockchain network; 2) In the spectrum monitoring phase, SOs will use the blockchain network to call pre-deployed smart contracts to automatically monitor spectrum usage; the smart contract is responsible for publishing and managing crowdsourced monitoring tasks, and crowdsourced users CUs are free to choose whether to accept the crowdsourced monitoring tasks; (II) During the spectrum trading phase, the spectrum trading process is as follows: (1) Exchange for tokens; (2) SOs submit lease applications; (3) POs lease spectrum; (4) reaching a transaction; (III) During the spectrum monitoring phase, the crowdsourcing monitoring process is as follows: (1) Before issuing a crowdsourcing monitoring task, the system information broadcast by the 5G base station is encrypted and the digital signature generated by SIB1 and SIB9 is embedded into the system information broadcast by the 5G base station; (2) S0s calls a smart contract containing a crowdsourced monitoring task on the blockchain network to publish a crowdsourced monitoring task, including the spectrum range to be monitored, the geographical location, the duration of monitoring, and the reward for CUs; ​​CUs interested in the task in the target location confirm their acceptance of the crowdsourced monitoring task by sending a transaction on the blockchain network and monitor the MNO base stations in the corresponding task; the transaction will be processed by the smart contract, and the public key and corresponding account of the CUs will be recorded in the task recipient list; (3) When CUs receive the system information broadcast by the 5G base station, they verify the digital signature and report the system information broadcast by the 5G base station as evidence to the blockchain network if there is any contract violation; (4) After CUs send the evidence with their own digital signatures to the blockchain network, each blockchain node needs to reach a consensus on whether the evidence is valid; if the evidence is considered valid according to the consensus, the relevant smart contract will automatically execute two types of transactions: one is to punish by transferring a certain number of tokens from the MNOs account that has contract violations in the crowdsourced monitoring task to the SOs account that issued the crowdsourced monitoring task; the other is to transfer a certain number of tokens to the CUs account as a reward.

2. The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring according to claim 1 is characterized in that: During the spectrum trading phase, the spectrum trading process is as follows: (1) Exchange for tokens Before spectrum trading, the relevant MNO base stations obtain specific digital assets, namely tokens, from financial institutions to be used as a means of payment in spectrum trading; each MNO base station has an independent account address, which is used to store tokens issued by financial institutions; (2) SOs submit lease applications SOs submit spectrum leasing applications in the blockchain network. The application content includes detailed information such as the required spectrum range, geographical location, leasing time period, leasing quotation and validity period of the leasing application. The leasing application is digitally signed by SOs and issued in the form of a transaction. The blockchain node needs to verify the validity of the leasing application, including but not limited to checking the rationality of the spectrum range, geographical location and leasing time period. In addition, once the time exceeds the validity period of the leasing application, the leasing application will automatically become invalid. (3) POs lease spectrum POs query the spectrum leasing application in the blockchain network, or directly publish the information of leasing spectrum through the blockchain network according to their own leasing needs; the information of leasing spectrum includes but is not limited to the spectrum range, geographical location, leasing time period, leasing quotation and the effective time limit of leasing spectrum; blockchain nodes need to verify the information of leasing spectrum, including but not limited to confirming that the leased spectrum is indeed owned by POs, and the rationality of the leasing time period and geographical location; if the information of leasing spectrum is not leased within the prescribed effective time limit, the information of leasing spectrum will automatically become invalid; (4) Transaction conclusion After the blockchain network collects the leasing applications or spectrum leasing information of each MNO base station, the relevant smart contract will automatically execute the matching process to reach a spectrum transaction and complete the token transfer process. Then, SOs use the spectrum resources leased by POs according to the contract.

3. The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring according to claim 1 is characterized in that: The NCGI, frequencyInfoDL, frequencyInfoUL and UTC information carried by the SIB1 and SIB9 system information broadcast by the 5G base station are used for the encryption design of the system information broadcast by the 5G base station.

4. The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring according to claim 1 is characterized in that: The method of encrypting the system information broadcast by the 5G base station and embedding the digital signature of each MNO base station into the system information broadcast by the 5G base station is as follows: Each MNO base station deploys a private key generator PKG, which can generate a unique MNO private key SK O , Generate MNO public key PK based on elliptic curve cryptography ECC O : PK O =SK O ·G Where G is the base point on the elliptic curve; According to NCGI, SK O and PK O Generate a private key SK for each MNO base station ID and SK ID ; SK ID =SK O ·NCGI PK ID =PK O ·NCGI Each MNO base station retains its SK ID , while PK O It is stored in the blockchain network. After CUs access the blockchain network, they can directly query PK from the blockchain network. O .

5. The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring according to claim 4 is characterized in that: Each MNO base station performs the following process to complete the digital signature embedding process: 1) Concatenate SIB1 and SIB9 into a single string S; 2) Generate a digital signature using a digital signature generation algorithm; 3) Insert digital signatures into unused fields of system information broadcast by 5G base stations 6. The mobile network spectrum sharing optimization method based on blockchain and crowdsourcing monitoring according to claim 3 is characterized in that: CUs receives the system information broadcast by the 5G base station and verifies the digital signature as follows: 1) Concatenate SIB1 and SIB9 in the system information broadcast by the received 5G base station into a single string S′; 2) Get NCGI from SIB1, and then based on PK O Calculate PK ID ; 3) Using S′ and PK ID To verify whether the digital signature is valid, if not valid, it proves that the system information broadcast by the 5G base station is sent by a fake base station, and it is directly discarded, and then continue monitoring until the crowdsourcing monitoring task is completed; if valid, the CUs confirm that the system information broadcast by the 5G base station is sent from a base station with a specific NCGI, and then proceed to 4) 4) CUs parse the sending time of the system information broadcast by the 5G base station and the spectrum range used from SIB1 and SIB9, and judge whether the MNO has illegally allocated illegal spectrum at the current time based on the crowdsourcing monitoring task; if there is a contract violation, CUs reports the system information broadcast by the 5G base station as evidence to the blockchain network, and then continues to monitor until the crowdsourcing monitoring task is completed.

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