  Quantum deformations of (anti-)de Sitter algebras in (2+1) dimensions are
revisited, and several features of these quantum structures are reviewed. In
particular, the classification problem of (2+1) (A)dS Lie bialgebras is
presented and the associated noncommutative quantum (A)dS spaces are also
analysed. Moreover, the flat limit (or vanishing cosmological constant) of all
these structures leading to (2+1) quantum Poincar\'e algebras and groups is
simultaneously given by considering the cosmological constant as an explicit
Lie algebra parameter in the (A)dS algebras. By making use of this
classification, a three-parameter generalization of the \kappa-deformation for
the (2+1) (A)dS algebras and quantum spacetimes is given. Finally, the same
problem is studied in (3+1) dimensions, where a two-parameter generalization of
the \kappa-(A)dS deformation that preserves the space isotropy is found.
