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Service discovery is the task-based approach that is used for finding the best resources (services) as per the vehicular user requirements. The best services are retrieved based on three modules such as functional module, context module, and non-functional module [14]. The modules are defined as follows:

Functional Module: All the real-time interactions through the vehicular interfaces are comes under the functional modules.

Context Module: Context module includes the context details about the particular vehicle such as location, date, place, time, and so on. The context module (CM) is classified into two types such as direct CM and indirect CM.

Direct CM: The direct CM is the manual collection of information from reliable cars.

Indirect CM: The indirect CM is the automated data acquisition by the sensors.

Context Module Resources: The context module resources are typically divided into three categories are User context module, Network context module, and Environment context module.

User Context Module: The user context module encompasses data that is supposed to be indirectly accessible when the requester communicates with some variables, like identification, position, and desire of the requester. The user context module is divided into three types are vehicular user identification, vehicular user position, and vehicular user desire.

Vehicular User Identification: Vehicular user identification is the method for assigning a specific identification to a vehicle user. This may also contain sensitive details of the customer, such as vehicle model, name, father’s name, date of birth, and so on.

Vehicular User Position: Vehicular user position details which include the vehicle’s location, orientation, altitude, and geographical connections such as, proximity, co-location, and containment.

Vehicular User Desire: Vehicular user desire acquires information about the profile of their vehicular users, which includes the personality, and behavior of the customer.

Network Context Module: The network context module comprises network related information such as maximum throughput, error rate, communication link, and data rate.

Environment Context Module: The environment context module comprises of environment-related information such as place definition, physical and environmental circumstances, and sequence of activities about the milieu.

Non-Functional Module: It is characterized as a combination of many attributes or characteristics of a service, like reliability, capability, cost, durability, security, and robustness [14].