TCP is often blamed that it cannot use efficiently network paths with high Bandwidth-Delay Product (BDP). The BDP is of fundamental importance because it determines the required socket buffer size for maximum throughput. In this paper, we re-examine the BDP concept, considering the effects of network buffering and cross traffic on the ‘bandwidth’ and ‘delay’ characteristics of a path. We show t...

We propose an adaptive flow-level multipath routing-based traffic engineering solution for an IP backbone network carrying TCP/IP traffic. Incoming TCP flows are switched between two explicitly routed paths, namely the primary and secondary paths, for resilience and potential goodput improvement at the TCP layer. In the proposed architecture, primary paths receive a preferential treatment over ...

TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network and, thus, improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously u...

Congestion control in wireless networks is strongly dependent on the dynamics and instability of wireless links. It is known that TCP experiences serious performance degradation problems in wireless networks. New approaches based on TCP try to overcome these problems but, although their performance is increased, they incur in congestion control errors, since they do not evaluate accurately the ...

TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network and, thus, improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously u...

TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network and, thus, improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously u...

TCP/IP communication is currently restricted to a single path per connection, yet multiple paths often exist between peers. The simultaneous use of these multiple paths for a TCP/IP session would improve resource usage within the network, and thus improve user experience through higher throughput and improved resilience to network failure. Multipath TCP provides the ability to simultaneously us...

TCP experiences serious performance degradation in wireless multi-hop networks with its probe-based, loss-driven congestion control scheme. We describe the Wireless eXplicit Congestion control Protocol (WXCP), a new explicit flow control protocol for wireless multi-hop networks based on XCP. We highlight the approaches taken by WXCP to address the difficulties faced by the current TCP implement...

For applications involving data transmission from multiple sources, an important problem is: when the sources use multiple paths, how to maximize the aggregate sending rate of the sources using application-layer techniques via TCP? We solve this problem in the context of an overlay network by allowing a source to send data over k (k ≥ 1) overlay paths to its destination. Our goal is to select t...

This paper provides a preliminary investigation into the impact a link with changing propagation delay has on the performance of TCP file transfers. We investigate over a dozen different variable delay patterns, based on spacecraft movement. We highlight the performance impact of such variability, paying close attention to TCP’s retransmission timer, which is based on the observed round-trip ti...