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When various radio systems of the same type of Cognitive Radio Networks (CRNs) compete for channel resources, it becomes important to define some measures for them to coexist with the members of their own community, this is known as self-coexistence in literature. This paper studies self-coexistence by considering switching, interference, and channel quality as the three major impacting factors and thus presents the channel assignment algorithm (SwICh) for self coexistence in cognitive radio networks. This paper presents the assignment of blocks of channels (spectrum) available at various time periods, also known as time spectrum block (TSB) assignment. A set of access points (APs) or base stations (BSs), are allocated TSBs for data transmission by a centralized server. This server provides each AP a TSB based upon the three factors of switching, interference, and channel quality and their relative …