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This work considers load-balance control among the relays under the securetransmission protocol via relay cooperation in two-hop wireless networkswithout the information of both eavesdropper channels and locations. Theavailable two-hop secure transmission protocols in physical layer secrecyframework cannot provide a flexible load-balance control, which maysignificantly limit their application scopes. This paper proposes a securetransmission protocol in case that the path-loss is identical between all pairsof nodes, in which the relay is randomly selected from the first $k$ preferableassistant relays. This protocol enables load-balance among relays to beflexibly controlled by a proper setting of the parameter $k$, and covers theavailable works as special cases, like ones with the optimal relay selection($k=1$) and ones with the random relay selection ($k = n$, i.e. the number ofsystem nodes). The theoretic analysis is further provided to determine themaximum number of eavesdroppers one network can tolerate by applying theproposed protocol to ensure a desired performance in terms of the secrecyoutage probability and transmission outage probability.

Exploring Relay Cooperation Scheme for Load-Balance Control in Two-hop Secure Communication System