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Telecommunication Companies Use Nokia 's Gsm Network

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GSM ARCHITECTURE
INTRODUCTION
Most of the top telecommunication companies use Ericsson’s GSM network including Vodafone Delhi. GSM R9 network, a multi service network has the ability to accommodate a variety of networks. For the operator, continuity of services, end client application portfolios and significant cost reductions in transmission, operation and support are the implications of GSM R9. GSM is an advanced TDMA framework upgraded for full duplex voice telephony.
The network is partitioned into:
• Switching systems (SS)
• Base station system (BSS)
• Operation and support system (OSS)
The entire system is made up of every system’s functional units.
NODES

1. Switching system

• Mobile services switching centres
It plays out the system telephony switching functions as well as controls calls to and from other telephony and data systems, such as the PSTN and PLMN. In Ericsson’s GSM system, the VLR is constantly incorporated with the MSC to shape a MSC/VLR to use internal signalling.
• Visitor location register
The visitor location register is a database containing information about all the MSS that as of now are located in the MSC service area. It has temporary subscriber information that the MSC requires to provide service for visiting subscribers. The VLR can be seen as a distributed BHLR. When a mobile station roams into a new MSC service area, the VLR associated with that MSC requests data about the MS from the HLR and stores it. The VLR has all the required

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