  We provide a characterization of multiqubit entanglement monogamy and
polygamy constraints in terms of negativity. Using the square of convex-roof
extended negativity (SCREN) and the Hamming weight of the binary vector related
to the distribution of subsystems proposed in Kim (Phys Rev A 97: 012334,
2018), we provide a new class of monogamy inequalities of multiqubit
entanglement based on the $\alpha$th power of SCREN for $\alpha\geq1$ and
polygamy inequalities for $0\leq\alpha\leq1$ in terms of squared convex-roof
extended negativity of assistance (SCRENoA). For the case $\alpha<0$, we give
the corresponding polygamy and monogamy relations for SCREN and SCRENoA,
respectively. We also show that these new inequalities give rise to tighter
constraints than the existing ones.
