The Home Location Register (HLR) is a central database in mobile networks responsible for storing and managing subscriber information. It maintains details such as user profiles, subscription data, and current locations of subscribers. The HLR plays a crucial role in facilitating call routing, managing network resources, and supporting various network services. It is primarily used in GSM and UMTS networks to handle authentication, billing, and other core functions related to subscriber management.
What is the function of visitor location register?
The Visitor Location Register (VLR) is a database that temporarily stores information about subscribers who are currently roaming in a different location from their home network. Its primary function is to manage and update the subscriber’s location while they are in a foreign network area. The VLR interacts with the HLR to obtain subscriber details needed for call routing, authentication, and service delivery. It ensures that calls and messages are correctly routed to the roaming subscriber and provides necessary network services during their visit.
The HLR works by maintaining a comprehensive record of each subscriber’s profile, including their subscription details, service preferences, and current location. When a subscriber initiates a call or a service request, the HLR is queried to retrieve necessary information for authentication, call routing, and billing. The HLR communicates with the VLR to update and verify the subscriber’s current location and status, ensuring proper service delivery and network management.
In call routing and roaming, the HLR and VLR work together to manage subscriber interactions. When a call is made to a subscriber, the HLR provides the VLR with the necessary information to route the call to the subscriber’s current location. During roaming, the VLR temporarily stores the subscriber’s details and updates the HLR with their current location. This collaboration ensures that calls, messages, and services are correctly directed to the subscriber, regardless of their location.
The HLR stores a range of subscriber-related information, including personal details, subscription status, service profiles, and current location. It also keeps records of authentication and authorization data, billing information, and any special services or features that the subscriber has. This comprehensive database enables efficient network management and supports various functions such as call routing, roaming, and service provisioning.
