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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: q_long who wrote (15664)	10/10/2001 10:02:39 AM
From: Eric L	Respond to of 196670

q_long, << What is HLR >> Home Location Register. Part of the Network Subsystem in a Mobile network. Brief functional description of same (for a GSM Network) is supplied below courtesy of John Scourias of the University of Waterloo. In GSM the AuC plays a slightly different role than in an ANSI-41 network because of the SIM which is a component of every GSM Mobile Station. That is one of the reasons that the R-UIM in multimode handsets takes on significance for roaming and will be required in conjunction with the Bell Labs/Lucent solution. The multi-mode handset, in and of itself doesn't solve all roaming and interoperability problems for GSM/TDMA/CDMA networks. Potentially the Bell Labs solution provides a missing puzzle piece for IS-136 TDMA or CDMA operators that wish to roam with or host roaming (or exchange data) with GSM Carriers. >> The central component of the Network Subsystem is the Mobile services Switching Center (MSC). It acts like a normal switching node of the PSTN or ISDN, and additionally provides all the functionality needed to handle a mobile subscriber, such as registration, authentication, location updating, handovers, and call routing to a roaming subscriber. These services are provided in conjuction with several functional entities, which together form the Network Subsystem. The MSC provides the connection to the fixed networks (such as the PSTN or ISDN). Signalling between functional entities in the Network Subsystem uses Signalling System Number 7 (SS7), used for trunk signalling in ISDN and widely used in current public networks. The Home Location Register (HLR) and Visitor Location Register (VLR), together with the MSC, provide the call-routing and roaming capabilities of GSM. The HLR contains all the administrative information of each subscriber registered in the corresponding GSM network, along with the current location of the mobile. The location of the mobile is typically in the form of the signalling address of the VLR associated with the mobile station. The actual routing procedure will be described later. There is logically one HLR per GSM network, although it may be implemented as a distributed database. The Visitor Location Register (VLR) contains selected administrative information from the HLR, necessary for call control and provision of the subscribed services, for each mobile currently located in the geographical area controlled by the VLR. Although each functional entity can be implemented as an independent unit, all manufacturers of switching equipment to date implement the VLR together with the MSC, so that the geographical area controlled by the MSC corresponds to that controlled by the VLR, thus simplifying the signalling required. Note that the MSC contains no information about particular mobile stations --- this information is stored in the location registers. The other two registers are used for authentication and security purposes. The Equipment Identity Register (EIR) is a database that contains a list of all valid mobile equipment on the network, where each mobile station is identified by its International Mobile Equipment Identity (IMEI). An IMEI is marked as invalid if it has been reported stolen or is not type approved. The Authentication Center (AuC) is a protected database that stores a copy of the secret key stored in each subscriber's SIM card, which is used for authentication and encryption over the radio channel. << - Eric -