Abstract
Transmission Control Protocol (TCP) provides reliable connection by acknowledging every transmitted packet. The faster the acknowledgement (ACK) packet is received, the quicker the next TCP window is sent. Previous study shows that by prioritizing the ACK packet route, the TCP delay for the whole data transmission is reduced. This article utilized the medium access within WiMAX network, which is the scheduler, to prioritize the ACK packet transmission. The NS-2 evaluations with various data rate transmission show that the WiMAX scheduling to prioritize the ACK packet successfully reduces the whole data transmission delay. In average, a thirty-second video duration takes 755 ms faster when prioritized ACK is applied.
Highlights
Transmission control protocol (TCP) is the most common transport layer protocol used for end to end connection within internet [1]
This paper proposes TCP delay reduction by using the same technique within an 802.16 network
The results show that direct link exerts TCP delay reduction
Summary
Transmission control protocol (TCP) is the most common transport layer protocol used for end to end connection within internet [1]. TCP provides reliable connection where the calling party initiates connection by using three way handshakes This is to make sure that the called party is available before data transmission is performed. This enables both parties to exchange parameters and network capabilities to optimize end to end connection performance. As nodes and links are varied in speed, number of packets sent before expecting the ACK; so called as window, may vary This enables TCP to perform flow control [2]. A direct circuit switching call via cellular is an example of shortened link (Figure 3) It is circuit switching and not the packet switching such as EDGE or HSPA, so that end to end connection for ACK does not experience queue.
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