Improving the spectrum aware mobility management in cognetive radio network

The system model conforms to the IEEE 802.22 standard, and the proposed two-step solution to the EE maximization problem satisfies users' minimum rate requirements and keeps the interference to the primary users in the neighboring areas below a specified threshold. TV white spaces are vacant frequencies made available for unlicensed use at locations where spectrum is not being used by licensed services, such as television broadcasting. The computational complexity of the resulting resource allocation protocol is the same as that of the least complex resource allocation protocol for orthogonal frequency division multiple access (OFDMA) downlinks Lack of articles dealing with cognitive radio EE in general is understandable, because cognitive radio EE maximization problem adds only one more constraint to the OFDMA EE maximization problem a per-carrier interference constraint. The focus of this paper is the frequency and power allocation that maximizes the bit/joule/hertz EE of orthogonal frequency division multiple access (OFDMA)-based transmissions from a cognitive base station operating in the TV white spaces.