Voice Quality Planning for NGN including Mobile Networks

Abstract

The plan of transmission parameters or the network plan was created for Czech Republic in 2005 and this plan has had key effect on traffic in the telecommunication networks providing public telephone service, including mobile networks, NGN networks based on IP protocol and private networks connected to public telephone network. This paper describes practical effects of aforesaid plan on some typical situations in the network. Related research projects of the Department of Telecommunications Engineering, Faculty of Electrical Engineering, CTU in Prague are presented here, such as tandem arrangement of codecs and non-intrusive monitoring of voice quality.

IP telephony based danger alert communication system and its implementation

“…The list contains information about the number of target participants -Creq to whom it will be necessary to send the pre-recorded message, the number of the BTS on which the participant is registered -BTSnum and the capacity of the given BTSBTScap. The definition of the range for BTSnum and BTScap is described by (11) and (12). Figure 8 illustrates the connection between the module for distribution of incoming requests and the module for prevention of GSM system's congestion.…”

“…To calculate the real bandwidth BW M [bps], we have used formula (1) where H [b] is the sum of all headers [11]. The parameter C R [bps] is the codec's transfer speed (codec rate) and the formula (2) determines the gap between the packets with samples (timing in the process of packetizing), where P S [b] is the payload size [12].…”

“…Their number derives from num BTS (11). The capacity of individual groups is determined by relation (13) and the sum of these groups (14) determines the total request capacity of mobile BTSs in a particular area -Ccap (15).…”