On Novel Access and Scheduling Schemes for IoT Communications

Table 1

Major simulation parameters.

Parameters	Values
Tx power	23 dBm for 3D-UMa 500 m for UEs and IoT devices
Duplex	FDD
Tx antenna configurations	Tx antenna elements config.: 1 omni for both UEs and IoT devices
Rx antenna configurations	BS Rx antenna elements config: , 0.5 λ H/0.8 λV
Traffic model	Date rate 0.5 Mbps TR36.814 Ftp model 2 for UEs [17]; Data rate 80 kbps for IoT devices
Modulation	AMC for UEs; QPSK for IoT devices
Coding scheme	AMC for UEs; Turbo Code (code rate 0.23) for IoT
System bandwidth	10 MHz (50 PRBs)
Power control	Open loop fractional power control for UEs; alpha = 0.7  dBm
Network synchronization	Synchronized
MUSA	Spreading sequences are generated by pseudorandom sequences
UE distribution	Number of UEs = 300, distribution according to 36.873 [18], Poisson arrival with rate 10/sec
IoT distribution	Number of devices varied from 1 to 30000 in steps of 3000, distribution according to 36.873; Access intensity as traffic model 2 in [19]
	Non-ideal channel estimation
Receiver	MMSE-IRC, detailed guidelines according to Rel-12 assumptions [20]
SRS		1Tx, 5 ms periodicity, wideband