Network Lifetime Optimization under QoSConstrains for Coded Cooperative Networks byDynamic Resource Allocation
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Graphical Abstract
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Abstract
Network lifetime optimization is a vital and
challenging design issue for battery-operated wireless net-
works, which guarantee uninterrupted information trans-
mission in wireless networks. Fortunately, emerging as
a new communication paradigm, cooperation communica-
tion provides an e®ective way to share resource among net-
work nodes that can be used to extend network lifetime. In
this paper, the dynamic resource allocation strategies are
introduced to optimize the network lifetime under Qual-
ity of service (QoS) constraints for coded cooperative net-
works, which consider power control, multi-relays selec-
tion and Level of cooperation (LOC) adjustment jointly.
An optimization model for minimizing and balancing the
energy consumption under QoS constrains is formulated
based on a TDMA scenario. When the LOC is constant,
the closed form optimal solution is got by Karush-Kuhn-
Tucker (KKT) conditions, which results in an optimal re-
source allocation strategy. Based on the solution, a sub-
optimal scheme is further proposed for a variable LOC.
Simulation results show that our schemes can dramatically
prolong network lifetime and support higher QoS levels
compared with other existing cooperative resource alloca-
tion schemes.
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