ACK Loss-Aware RTO Calculation Algorithm over Flooding-Based Routing Protocols for UWSNs

Sungwon LEE
Dongkyun KIM

IEICE TRANSACTIONS on Information and Systems   Vol.E97-D    No.11    pp.2967-2970
Publication Date: 2014/11/01
Publicized: 2014/08/22
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDL8127
Type of Manuscript: LETTER
Category: Information Network
UWSN,  flooding based routing,  TCP,  retransmission,  round trip time,  

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In typical end-to-end recovery protocols, an ACK segment is delivered to a source node over a single path. ACK loss requires the source to retransmit the corresponding data packet. However, in underwater wireless sensor networks which prefer flooding-based routing protocols, the source node has redundant chances to receive the ACK segment since multiple copies of the ACK segment can arrive at the source node along multiple paths. Since existing RTO calculation algorithms do not consider inherent features of underlying routing protocols, spurious packet retransmissions are unavoidable. Hence, in this letter, we propose a new ACK loss-aware RTO calculation algorithm, which utilizes statistical ACK arrival times and ACK loss rate, in order to reduce such retransmissions.

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