Supportive relay with heterogeneous transceivers: Quantification of energy efficiency improvement

Relay Type 1a in LTE-Advanced: Can it increase energy efficiency?

“…The largest energy saving corresponds to the lowest energy consumption ratio, α LB [4]. Table 2 shows α LB in this scenario.…”

“…If a reliable estimate of the channel loss, L, is available, the perfect power control enables adjusting p t to yield p r = P th . A total transmitter (TX) power consumption model as a function of transmit power, p T X (p t ), with power control at the TX with known channel loss, for L ∈ (0, L max ), is given in [4]. The receiver (RX) power consumption, p RX , is constant for any p r .…”

“…Consider a total power consumption model of a transceiver described in [4]. This is a raised-fractional-power transmitter power consumption model, with limited transmit power p t ∈ [p t,min , p t,max ] and the corresponding total transmitter power consumption p T X ∈ [p T X,min , p T X,max ].…”

“…The key part of the model is repeated here, for convenience, while parameters c RS and q (α) are defined in [4] …”

“…The basis for this work is [4], which has derived energy consumption ratio between transmission via relay and transmission via direct link, for heterogeneous transceivers and the same data rates in relay scheme and direct link. However, there is a possibility that data rate can be increased when using relay, which can lead to increased EE.…”