11-02-2013, 11:24 AM
INTRODUCTION TO WIRELESS NETWORKING
[attachment=50453]
INTRODUCTION:
Cellular telephone system: The cellular telephone system is responsible for
Providing coverage throughout a particular area known as coverage region or market
Wireless Network.The interconnection of many such markets defines a wireless network capable of providing service to mobile users throughout country or continent.
WORKING:
At the base station,the air interface portion of mobile transmission is discarded and the remaining voice traffic is passed along to the MSC on fixed networks.
• Each base station may handle on the order of 50 simultaneous calls.
• MSC is responsible for connecting as many as 100 base stations to PSTN.
• Hence connection between the MSC and PSTN requires substantial capacity at any instant of time.
LIMITATIONS IN WIRELESS NETWORKING:
• Wireless communication system is extremely complex.
• It requires an air interface between base station and subscribers to provide telephone grade communications under a wide range of propagation conditions and for any possible user location.
• To assure adequate area coverage the deployment of many base stations throughout a market is necessary and each base station must be connected to MSC
• The MSC must eventually provide connections for each of the mobile user to the PSTN which requires simultaneous connections to the LEC,one or more IXCs and to other MSCs via separate cellular signaling network.
• The radio spectrum available for this purpose is limited, thus wireless systems are constrained to operate in a fixed bandwidth to support an increasing number of users over time.
• As wireless systems grow, the necessary addition of base station increases
the switching burden of the MSC.
• As geographical location of mobile user changes constantly, extra overhead is needed by all aspects of a wireless network, particularly at the MSC.
[attachment=50453]
INTRODUCTION:
Cellular telephone system: The cellular telephone system is responsible for
Providing coverage throughout a particular area known as coverage region or market
Wireless Network.The interconnection of many such markets defines a wireless network capable of providing service to mobile users throughout country or continent.
WORKING:
At the base station,the air interface portion of mobile transmission is discarded and the remaining voice traffic is passed along to the MSC on fixed networks.
• Each base station may handle on the order of 50 simultaneous calls.
• MSC is responsible for connecting as many as 100 base stations to PSTN.
• Hence connection between the MSC and PSTN requires substantial capacity at any instant of time.
LIMITATIONS IN WIRELESS NETWORKING:
• Wireless communication system is extremely complex.
• It requires an air interface between base station and subscribers to provide telephone grade communications under a wide range of propagation conditions and for any possible user location.
• To assure adequate area coverage the deployment of many base stations throughout a market is necessary and each base station must be connected to MSC
• The MSC must eventually provide connections for each of the mobile user to the PSTN which requires simultaneous connections to the LEC,one or more IXCs and to other MSCs via separate cellular signaling network.
• The radio spectrum available for this purpose is limited, thus wireless systems are constrained to operate in a fixed bandwidth to support an increasing number of users over time.
• As wireless systems grow, the necessary addition of base station increases
the switching burden of the MSC.
• As geographical location of mobile user changes constantly, extra overhead is needed by all aspects of a wireless network, particularly at the MSC.