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Table 1 Existing literature comparison with this paper

From: Energy-efficiency maximization bidirectional direct and relay transmission

Optimal transmit power (OTP) [15–16], [19–23], [25–28], this paper
Optimal transmit time (OTT) [19–20], [22–23], [27–28], this paper
Circuit power (CP) consumption [15–16], [20–23], [26–28], this paper
Power amplifier (PA) efficiency [15], [20–23], [26–28], this paper
Direct links (DLs) [18], [24–28], this paper
Optimal relay position (ORP) [17], [27], [29–30], this paper