Note that users in distributed multiuser communication systems may cooperate among themselves, which may not be possible in cooperative relaying networks due to the latter's simpler assumed relay topology.
For the single antenna devices (MSs and RSs) to cooperate among each other, the setup and maintenance of a cooperative link is required.
These include the fluidity of ethnic groups, the inability of the peoples of the region to agree and cooperate among themselves, a tendency on the part of political authority to devolve to local levels as soon as central power is weakened, the influence of foreign powers, and the difficulty of introducing into the area concepts that have evolved in a different political and social context.
In addition, subpopulations compete and cooperate among each other.
There are considerable benefits from cooperating among member states on meeting the 2020 renewable energy sources (RES) targets.
To keep the relay functionality and relaying strategy simple we do not allow relay nodes to cooperate among themselves.
This may reflect a greater willingness to cooperate among female and non-single-child respondents over time after they have been followed for several waves.
So, under this circumstance, nodes need to cooperate among each other in order to deliver the gathered data to the final destination (i.e. BS).
The optimal detection/false-alarm probabilities are achieved by selectively cooperating among SUs with high detection SNRs of the PU signal.
The proposed solution is based on three heterogeneous mobile platforms, working in three different environments (domestic, condominium, outdoor), able to cooperate among themselves and with other machines in the framework (i.e. the elevator of the condominium).
The problem with multiple relay nodes is unsolved, since how multiple relay nodes should cooperate among themselves to help the destination to decode the source message is hard to characterize.
