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The inverse seesaw mechanism with three pairs of gauge-singlet neutrinosoffers a natural interpretation of the tiny masses of three active neutrinos atthe TeV scale. We combine this picture with the newly-proposed Friedberg-Lee(FL) symmetry in order to understand the observed pattern of neutrino mixing.We show that the FL symmetry requires only two pairs of the gauge-singletneutrinos to be massive, implying that one active neutrino must be massless. Wepropose a phenomenological ansatz with broken FL symmetry and exact \mu-\tausymmetry in the gauge-singlet neutrino sector and obtain the tri-bimaximalneutrino mixing pattern by means of the inverse seesaw relation. We demonstratethat non-unitary corrections to this result are possible to reach the percentlevel and a soft breaking of \mu-\tau symmetry can give rise to CP violation insuch a TeV-scale seesaw scenario.

Friedberg-Lee symmetry and tri-bimaximal neutrino mixing in the inverse seesaw mechanism