A Survey on Radio Resource Allocation for V2X Communication

Table 1

Comparison of the existing underlaying RBs sharing-based user pairing V2X services.

Ref.	Unicast/broadcast	Objectives	Scenarios	User types	Allocation constraints	Power control/allocation	Allocation process	Methods/theory	RB sharing
[18]	Broadcast	Increase throughput	Road	V2V-UEs; V2I-UEs	PF	—	Orthogonal RBs are allocated to each user type	Graph theory	1 V2V-UE; 1 V2I-UE
[19]	Unicast	Maximize sum rate fairness; minimize latency reliability	Urban	C-UEs; V-UEs	OP; SINR; Latency	PC	Orthogonal RBs are allocated to each user type	An interior point method; Hungarian algorithm	1 C-UE; 1 V-UE
[20]	Unicast	Maximize sum rate fairness; minimize latency reliability	Urban	C-UEs; V-UEs	OP; SINR; Latency	PA	Orthogonal RBs are allocated to each user type	Karush–Kuhn–Tucker theory; Dual decomposition method; Hungarian algorithm	1 C-UE; 1 V-UE
[21]	Unicast	Maximize sum rate fairness; minimize latency reliability	Urban	C-UEs; V-UEs	OP; SINR; Latency	PA	Orthogonal RBs are allocated to C-UEs; nonorthogonal RBs are allocated to V-UEs	Perron–Frobenius theory; Interior point method	1 C-UE; N V-UEs
[22]	Unicast	Maximize sum rate fairness; minimize latency reliability	Urban	C-UEs; V-UEs	OP; SINR; Latency	PA	Orthogonal RBs are allocated to C-UEs; nonorthogonal RBs are allocated to V-UEs	Matching theory; Interior point method	1 C-UE; N V-UEs
[23]	Broadcast	Maximize the number of concurrent V2V transmissions	Urban freeway	V-UEs	SINR	—	Nonorthogonal RBs are allocated to V-UEs	Perron–Frobenius theory	N V-UEs
[24]	Unicast	Maximize throughput; minimize latency	Urban	C-UEs; Safety and nonsafety V-UEs	SINR; Latency	—	Orthogonal RBs are allocated to each user type	Hypergraph matching theory	1 C-UE; 1 safety; V-UE; 1 nonsafety V-UE
[25]	Unicast	Maximize throughput reliability	Multilane freeway	V2V-UEs; V2I-UEs	OP	PA	Orthogonal RBs are allocated to each user type	Hungarian method	1 V2V-UE; 1 V2I-UE
[26]	Unicast	Reliability; maximize the ergodic capacity	Multi-lane freeway	V2V-UEs; V2I-UEs	OP	PA	Orthogonal RBs are allocated to each user type	Hungarian method	1 V2V-UE; 1 V2I-UE
[27]	Broadcast	Maximize the C-UEs information rate; guarantee reliability/latency requirement of V-UEs	Urban	C-UEs; V-UEs	Latency; OP; SINR	PA	Orthogonal RBs are allocated to each user type	Lagrange dual decomposition method; Binary search method; Subgradient iteration method	1 C-UE; 1 V-UE
[28]	Unicast	Maximize throughput (C-UEs/nonsafety V-UEs); guarantee QoS demand (W-UEs/safety V-UEs)	Freeway	W-UEs; C-UEs; Safety and nonsafety V-UEs	SINR	—	Orthogonal RBs are allocated to each user type	Kuhn–Munkres algorithm; Gale–Shapley algorithm	1 C-UE; 1 nonsafety V-UE
[29]	Unicast	Maximize the total throughput for C-UEs and V-UEs	Freeway	W-UEs; C-UEs; Safety and nonsafety V-UEs	SINR	—	Orthogonal RBs are allocated to each user type	An interior point method; Kuhn–Munkres method	1 C-UE; 1 nonsafety V-UE
[30]	Unicast	Maximize V2I-UEs sum rate; guarantee V2V-UEs reliability requirement	Freeway	V2I-UEs; V2V-UEs	SINR; Buffer size; Packet delay	—	Orthogonal RBs are allocated to each user type	—	1 V2I-UE; 1 V2V-UE
[31]	Unicast	Maximize V2I-UEs sum rate; guarantee V2V-UEs reliability requirement	Freeway	V2I-UEs; V2V-UEs	SINR; Buffer size; Packet delay	PC	Orthogonal RBs are allocated to each user type	—	1 V2I-UE; 1 V2V-UE
[32]	Unicast	Maximize C-UEs sum rate; guarantee V-UEs reliability requirement	Freeway	GBR C-UEs; NGBR C-UEs; V-UEs	PDR; SINR; Buffer size; Packet delay	—	Orthogonal RBs are allocated to each user type	—	1 C-UE; 1 V-UE
[33]	Unicast	Maximize sum rate and respect constraint delay of C-UEs; guarantee V-UEs reliability and latency	Freeway	C-UEs; Safety V-UE; Nonsafety V-UE	PDOR; SINR; Delay	—	Orthogonal RBs are allocated to each user type	—	1 C-UE; 1 safety V-UE; 1 nonsafety V-UE