This paper describes the survey approach to building a high-quality of dynamic Spectrum access (DSA) and
management in vehicular environment networks in Tanzania as one of the ways of mitigating the shortage of
access. Frequency spectrum is a limited resource for wireless communications and may become congested
owing to a need to accommodate the diverse types of air interface used in wireless networks. The objective of
this paper is to meet these growing demands by provide a brief overview of the cognitive radio technology.
The paper explains the existing work and challenges in spectrum sensing. It describes the next network
functionalities: spectrum management, spectrum mobility and spectrum sharing and further explains how
next network functions can be implemented.