Next Generation Network (NGN) represents a fundamental paradigm shift in the wireless communication which uses packet switching instead of circuit switching. NGN is an architecture that provides seamless integration of both new and traditional telecommunication services across high-speed packet networks. Heterogeneous network (HN) is the group of network which integrated with wired, wireless and sensory network with internet connectivity. Combination of HN and NGN (HNGN) will offers highly reliable services at all situation. Implementing protocols such as TCP is much complicate in the heterogeneous network environment. The objective of this paper is providing an assured, reliable data transmission in the HNGN. Data transmission in HNGN renders ineffective communication due to barrier when implementing different network protocols. The proposed methodology, called Reliable Barrier-Free Services (RBS) optimizes the reliability of HNGN. © 2011 Springer-Verlag.