By comparing the achievable performance of the CRP with that of the ICRP considered in Section 3.2, we will realize that using ideal assumptions for cooperation may greatly overestimate the achievable performance of cooperative wireless systems.
The spectral-efficiency of both uplink and downlink has been analyzed under the assumption of ideal BS cooperation.
Therefore, in relay communications, the performance predicted under the assumption of ideal relay cooperation may be too optimistic and, hence, unachievable in practice.
However, these works only investigate systems while each user transmits only single stream simultaneously, and the assumption of all receivers' cooperation is impractical in downlink networks.
All non-dispersing individuals are selected to exploit, but given our assumption that there is a cost of cooperation (s), this will weight selection to favoring cheaters, all else being equal.
An implicit assumption underpins basic models of the evolution of cooperation, mutualism and altruism: The benefits (or pay-offs) of cooperation and defection are defined by the current frequency or distribution of cooperators.
The concept of community implies mutual cooperation and assumption of responsibility for the welfare and wellbeing of neighbors.
Other suggestions are built on the assumption of more or less obligatory cooperation among the RNA sequences feeding on the same limiting resource, i.e., on selective forces maintaining coexistence of different sequences in spite of the inevitable competitive interactions among them.
Whether for cooperation or non-cooperation, a core assumption of this viewpoint is that such social interactions spring from a distinction between self and others.
Cue-dependent cooperation did not persist at any patch size under assortative mating under the present assumptions, but diverse cues and relatively high rates of cooperation were maintained if mating was disassortative and patches were small.
These assumptions follow the headstart or assured fitness return models of cooperation where the helper's benefit for the mother and her siblings is for potential nest survival if the mother should die [ 21, 22].
