From: TCP performance in multi-hop wireless ad hoc networks: challenges and solution
 | "FeW" | "APS-FeW" | "Vegas-W" | "Link RED and AP" | "CWL" |
---|---|---|---|---|---|
 | [48] | [49] | [47] | [46] | [24] |
DEALING WITH ROUTING FAILURES | No. | No. | No. | No. | No. |
DEALING WITH WIRELESS ERRORS | No. | No. | No. | No. | No. |
DEALING WITH CONTENTION | Yes: it reduces the TCP window over-shoot to reduce the contention. | Yes: it reduces the TCP window over-shoot to reduce the contention. | Yes: can be reduced by controlling the rate. | Yes: it detects early sign of congestion. The sending rate is reduced to improve spatial reuse and alleviate the contention. | Yes: contention can be reduced by limiting the cwnd. |
DEALING WITH RETRANSMISSION | No. | No. | No. | No. | Yes: the maximum retransmission time-out of TCP is modified to 2 second instead of 240 second. |
DEALING WITH TCP CONGESTION CONTROL MECHANISM | Yes: the cwnd is updated by fractional window. | Yes: it uses byte count instead of packet count to calculates cwnd. The packet size varies based on cwnd size. | Yes: both slow start and congestion avoidance mechanisms in TCP-Vegas are modified to increase cwnd after receiving more than one ACK. It also updates slow start threshold by tracking stable window. | No. | Yes: limiting the congestion window by the round-trip-hop-count. |
DEALING WITH HIDDEN EXPOSED PROBLEM | No. | No. | No. | Not directly but the problem can be reduced by considering spatial channel reuse. | Not directly but the problem can be reduced by considering spatial channel reuse. |
DEALING WITH TCP RATE | Yes: low rate caused by small window. | Yes: low rate caused by small window. | Yes: slow rate cased by congestion window fractions and rate control timer. | Yes: slow rate caused by (ECN) marking. | Yes: low rate caused by limited congestion window. |
DEALING WITH TCP ACK | No. | No. | No. | No. | No. |