Wydawnictwo SIGMA-NOT wydaje czasopisma fachowe informujące swoich czytelników o najnowszych osiągnięciach naukowych i nowoczesnych rozwiązaniach technicznych w Polsce na świecie, popularyzuje problemy techniczne oraz poszerza wiedzę kulturę techniczną.

The Internet nowadays plays an imperative role in critical domains such as finance, health, security, entertainment and military where real-time services with guaranteed resources become necessary. Services residing within the application layer in today’s fixed and mobile network environments are abstracting from the underlying network layer, and therefore, assuming pure IP connectivity without...

Mobility in a wireless heterogeneous scenario in which the mobile devices are able to connect to more than one access technology available in their vicinity requires a re-consideration of the access network reselection mechanisms as to ensure seamless handovers for real deployments. This paper describes and evaluates a new proactive vertical handover optimization which enables a fast reselectio...

As mobile data traffic increases, and the number of services provided by the mobile network increases, service load flows as well, which requires changing in the principles, models, and strategies for media transmission streams serving to guarantee the given nature of giving a wide scope of services in Flexible and cost-effective. Right now, the fundamental question remains what number of netwo...

This paper is to describe the new wireless communication technology Long Term Evaluation. LTE became the most powerful technology in cellular system to achieve the high speed, spectral efficiency and reduce latency rate in uplink and downlink. The LTE architecture is known as (SAE) service architecture evolution. SAE is the combination of Evolved universal terrestrial radio access network and E...