TABLE OF CONTENTS Network databases are information storage and retrieval systems that are accessible by a network. There are many network databases in the EVDO network. Some of the key network databases include a master subscriber database (home location register), temporary active user subscriber database (visitor location register), unauthorized or suspect user database (equipment identity register), billing database, and authorization and validation center (authentication).
The home location register (HLR) is a subscriber database containing each customer's international mobile subscriber identity (IMSI) and international mobile equipment identifier (IMEI) to uniquely identify each customer. There is usually only one HLR for each carrier even though each carrier may have many MSCs.
The HLR holds each customer's user profile including the selected long distance carrier, calling restrictions, service fee charge rates, and other selected network options. The subscriber can change and store the changes for some feature options in the HLR (such as call forwarding). The MSC system controller uses this information to authorize system access and process individual call billing.
The HLR is a magnetic storage device for a computer (commonly called a hard disk). Subscriber databases are critical, so they are usually back up regularly, typically on tape or CDROM, to restore the information if the HLR system fails.
The visitor location register (VLR) contains a subset of a subscriber's HLR information for use while a mobile telephone is active on a particular MSC. The VLR holds both visiting and home customer's information. The...
