Performance of Social-Position Relationship Based Cooperation Among Mobile Terminals Cooperation among multiple mobile terminals (MTs) can offer higher throughput and improved reliability. With the development of sensors and integrated intelligence, future MTs will have much context awareness of their users, the surrounding environment and the network. With this consideration, cooperation among MTs with awareness of social and position relationships is becoming attractive. How does the social-position relationship influence the cooperation performance? This paper investigates the cooperation throughput, which is a function of not only the wireless channel, but also the social-position relationships. Embodying the joint effect of the social-position relationship, a vital random variable is derived to give a unified model for the cooperation signal and it makes the performance analysis feasible. Afterwards, we derive a specific expression of the cooperation throughput, where two regions, namely linear and saturation, are identified. The generalized degrees-of-freedom (g.d.o.f.) is then employed to study the behavior of the throughput in the linear region. Specially, an explicit formulation between the g.d.o.f. and the social-position relationship is established. It shows that the g.d.o.f. provided by each cooperative MT is Pi min f1; ig, where the cooperation probability Pi and scaling exponent i are parameters characterizing the social and position relationship, respectively. Simulation results verify the theoretical analysis. Performance of Social-Position Relationship Based Cooperation Among Mobile Terminals