  We present a different kind of monogamy and polygamy relations based on
concurrence and concurrence of assistance for multiqubit systems. By relabeling
the subsystems associated with different weights, a smaller upper bound of the
$\alpha$th ($0\leq\alpha\leq2$) power of concurrence for multiqubit states is
obtained. We also present tighter monogamy relations satisfied by the
$\alpha$th ($0\leq\alpha\leq2$) power of concurrence for $N$-qubit pure states
under the partition $AB$ and $C_1 . . . C_{N-2}$, as well as under the
partition $ABC_1$ and $C_2\cdots C_{N-2}$. These inequalities give rise to the
restrictions on entanglement distribution and the trade off of entanglement
among the subsystems. Similar results are also derived for negativity.
