TCP Hollywood: An unordered, time-lined, TCP for networked multimedia applications

Abstract

Abstract-Ossification of the transport-layer limits networked multimedia applications to use TCP or UDP, despite standardisation of new transport protocols that better support their requirements. To improve transport for these applications, we present TCP Hollywood, an unordered, time-lined, TCP variant designed to support real-time multimedia traffic while being widely deployable. Analysis of the protocol indicates that it increases the utility of the network in lossy conditions where total one-way delay is constrained, such as with telephony applications and low-latency video streaming. This allows retransmissions to be useful in cases where they are not with standard TCP, improving the timely good-put of the protocol and reducing overheads. Initial experiments show that TCP Hollywood is deployable on the Internet, successfully operating on all major fixed and mobile networks in the UK, with safe failure modes.

Implementing Real-Time Transport Services over an Ossified Network

“…We conducted further deployment experiments using inconsistent retransmissions, testing all major UK providers, with the sender at the University of Glasgow [15]. The results are shown in Table 3.…”

“…However, TCP has a inconvenient API that imposes lots of work on application developers, and introduces higher than desired latency. We have shown how to address these issues, and provide the full set of transport services we propose in Section 2 in previous work, with our TCP Hollywood proposal [15].…”

“…When the intermediary layer reads from the socket, it receives the segment associated with the metadata entry at the head of the queue, with its TCP sequence number attached. This means that segments are delivered in the order that they arrive, removing the latency associated with head-of-line blocking in TCP [15].…”

TCP-TFEC: TCP Congestion Control based on Redundancy Setting Method for FEC over Wireless LAN

“…To begin with, TCP-Hollywood [18] has been developed for applications with tight latency bounds. In order to achieve the objective, TCP-Hollywood removes head-of-line blocking at the receiver and delivers received data to the application immediately irrespective of ordering.…”

“…Second, in order to improve the performance of TCP streaming services, the several TCP congestion controls [11], [12], [14], [18]- [20] have been proposed. To begin with, TCP-Hollywood [18] has been developed for applications with tight latency bounds.…”