Combining Cooperative Diversity and Multiuser Diversity: A Fair Scheduling Scheme for Multi-Source Multi-Relay Networks
Zhang Zhang, Tiejun Lv, Xin Su · IEEE Communications Letters · 2011
In this letter, we propose a round-robin (RR) based fair scheduling scheme (RRFS) to achieve both cooperative diversity (CD) and multiuser diversity (MUD) in multi-source, multi-relay amplify-and-forward (AF) cooperative networks. Different from traditional schemes in multiuser scenarios which only allow the "best" source to transmit and cause transmission unfairness, all the sources transmit in a RR fashion first in RRFS. In order to achieve both kinds of diversity in the relay phase, we then exploit a joint source-relay selection strategy which selects the "best" relay to help the "worst" source's transmission in each relay time slot. Therefore, RRFS brings MUD benefit to cooperation communication systems while maintaining transmission fairness.