TCP performance in multi-hop wireless ad hoc networks: challenges and solution

EURASIP Journal on Wireless Communications and Networking

Table 1 Comparison of the main characteristic of various TCP Enhancements

	"Fixed RTO"	"TCP-DOOR"	"BACKUP PATH"	"ROUTING EXPLOITING MULTIPLE INTERFACES"	"ELFN"
	[26]	[27]	[29]	[31]	[32]
DEALING WITH ROUTING FAILURES	Yes: the expiration of second RTO is taken to be evidence of a route loss.	Yes: out of order event is interpreted as an indication of route failure.	Yes: it uses multiple paths. if one path fail the other will backup the transmission	Yes: different routing protocols with different radio interfaces are used to backup that transmission	Yes: notify TCP about the route failure through ELFN message
DEALING WITH WIRELESS ERRORS	No.	No.	No.	No.	No.
DEALING WITH CONTENTION	No.	No.	No.	No.	No.
DEALING WITH RETRANSMISSION	Yes: it uses fixed RTO.	No.	No.	No.	Yes: upon receiving ELFN message, disable the retransmission timers and enters a standby mode.
DEALING WITH TCP CONGESTION CONTROL MECHANISM	No.	Yes: it temporarily disables the congestion control by keeping its state constant in case of out of order events.	No.	No.	No.
DEALING WITH HIDDEN EXPOSED PROBLEM	No.	No.	No.	No.	No.
DEALING WITH TCP RATE	No.	No.	No.	No.	No.
DEALING WITH TCP ACK	No.	Yes: ACK is used to notify the sender about out of order packet delivery.	No.	No.	No.