Energy-Efficient Uplink Resource Units Scheduling for Ultra-Reliable Communications in NB-IoT Networks

Table 4

Summary of notations.

notation	definition
	number of repetitions of
	subcarrier indication of
	number of RUs of
	modulation and coding scheme of
	set of allocated subcarriers of
	uplink request of (bits)
	required transmission reliability of
	delay constraint of (ms)
	data arrival time of (ms)
	transmit power of
	maximum transmit power of
	RU type of
	received signal-to-noise ratio of (dB)
	received power
	transmitter gain of
	receiver gain of
	path loss between and the eNB
	subcarrier bandwidth of the NB-IoT (Hz)
	noise power
	interference perceived at the eNB
	bit-error-rate of
	SNR threshold (dB)
	data rate of (bits per subcarrier slot)
	successful probability of data transmission of
	DCI subframe index of (ms)
	index of current scheduling subframe (ms)
	feasible subcarrier set
	index of earliest available subframe of subcarrier
	allocation start time of RU of (ms)
	number of slots for a single RU of
notations of the proposed scheme	definition
	feasible setting pairs of RU type and MCS of
	score value of
,	weighting factors
	urgent level of ’s request
	remaining time of ’s request from the scheduling subframe (ms) to the delay deadline
	potential waste of with its allocated subcarrier set
	earliest available allocation subframe (ms) of RUs for subcarrier
	best subcarrier of
	cost ratio of
	number of choices of RU types