As a key technology for the development of 5G networks, network slicing is developing rapidly. Although network slicing can realize the flexible division of 5G network resources and quickly customize virtual networks that meet the differentiated needs of customers, it is still difficult to determine the optimal service quality parameters in application scenarios. To solve the problem, this article designs a multichain 5G network slicing service quality computing model to calculate the service quality parameters of the network slicing. The calculated service quality parameters can be used as an adjustment basis in the negotiation of the SLA between the customer and the network operator. However, the traditional method of calculating information across chains will cause frequent information interactions and affect efficiency. Therefore, in this scheme, we deploy a smart contract on each blockchain to calculate the information, which can reduce the frequency of information transmission and improve efficiency. In addition, in order to make the calculation between smart contracts more fluent and the requirements more relevant, this article proposes to coordinate the development of smart contracts through multiple blockchains. Besides, to ensure the cross-chain security calculation, the signature by Cosi protocol and multisigncryption algorithms are used in the transmission of nonprivate information and private information in the cross-chain process, respectively. Security analysis and experimental results prove that the multichain 5G network slicing service quality computing model is feasible and efficient in practice.
