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The restricted isometry constants (RICs) play an important role in exactrecovery theory of sparse signals via l_q(0<q<=1) relaxations in compressedsensing. Recently, Cai and Zhang[6] have achieved a sharp bound\delta_tk<\sqrt{1-1/t} for t>=4/3 to guarantee the exact recovery of k sparsesignals through the l_1 minimization. This paper aims to establish new RICsbounds via l_q(0<q<=1) relaxation. Based on a key inequality on l_q norm, weshow that (i) the exact recovery can be succeeded via l_{1/2} and l_1minimizations if \delta_tk<\sqrt{1-1/t} for any t>1, (ii)several sufficientconditions can be derived, such as for any 0<q<1/2, \delta_2k<0.5547 when k>=2,for any 1/2<q<1, \delta_2k<0.6782 when k>=1, (iii) the bound on \delta_k isgiven as well for any 0<q<=1, especially for q=1/2,1, we obtain \delta_k<1/3when k(>=2) is even or \delta_k<0.3203 when k(>=3) is odd.

New RIC Bounds via l_q-minimization with 0