They must focus on increasing the link throughput and the network capacity.
Link quality is evaluated by means of the link-measurement model, while the link-performance model maps it to BLER and outputs link throughput and error distribution.
Femto link throughput (T): The femto link throughput is defined as the product of the probabilistic link throughput and the rate of transmission, i.e., T = τ log(1 + θ).
This metric is the difference value between the link throughput from the eNB to the second potential relay and the link throughput from the eNB to the first potential relay.
Based on the elaboration of the third point, we only consider cellular link throughput between BS and potential relays or receiving UEs, instead of uncertain throughput of outband D2D links, to construct relay preselection metrics.
For those, we define the total link throughput vectors by and for.
The optimal link throughput represents a trade-off between the WET and the data transmission, as more energy can be harvested with more time allocation τ, but less time is remained for the data transmission.
This specification has expected multi-station WLAN throughput of at least 1 gigabit per second and a single link throughput of at least 500 megabits per second (500 Mbit/s)." Simply put, 802.11ac is faster and more reliable than 802.11n, or any of the previous standards.
The relationship between the handoff overheads and some system parameters, such as link throughput, handoff delay, data packet arrival rate, etc., can be found in [12, 15, 16].
Because of the unavailability for calculating the D2D link throughput, the difference values between the link throughput from the eNB to the relaying UE and the link throughput from the eNB to the receiving UE are used to select potential relays.
