Open AccessChannel accessing and handoff mechanisms in TV white spaces based on channel sensing and database information
Author(s) -
Krishna Chaithanya K,
Meghalatha Ck,
K. Annapurna,
Seetha Ramanjaneyulu B
Publication year - 2018
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i4.20.22113
Subject(s) - handover , channel (broadcasting) , white spaces , interference (communication) , computer science , computer network , limiting , cognitive radio , database , process (computing) , telecommunications , engineering , wireless , mechanical engineering , operating system
Opportunistic channel accessing and handoff mechanisms are crucial for the successful implementation of cognitive radio networks that depend on vacant channel frequencies of TV white spaces and other primary users. In this work, two such mechanisms that enable quick accessing of vacant channels and cause less interference to primary users are proposed. In these methods, combination of database information and local sensing of channels is used, to know about available vacant channels. If the primary user of incumbent channel returns, the secondary user moves to another vacant channel that is found to be free after scanning. Information from database can be used to speed up the process by limiting the scanning to few probable channels, instead of searching for all. The results show that these methods offer quick handoff of secondary users and cause less interference to primary users.