Home location register (HLR):
• The home location register (HLR) is the permanent and important database of the GSM network.
• It maintains the permanent mobile number and profile information of each subscriber.
• The information about current location of each subscriber is also maintained in HLR.
Visitor location register (VLR):
• The visitor location register (VLR) is a temporary database of visiting mobile users, maintained by the visited network.
• The information about the currently visiting mobile users is maintained in VLR.
The edge router in home network in mobile IP is similar to the HLR in GSM.
The edge router in foreign network is similar to the VLR in GSM.
If you found this answer helpful, please upvote and share with other students in your network.