Abstract
Problem Statement: This study proposes a TCP layer protocol (Div-TCP) that aims to give a solution for communication over wireless mobile networks that have the occurrence of handoff at anytime. It describes a topology of wireless mobile network and the handoff process as an ordinary process in that type of networks which may cause segments losses. Approach: Wireless mobile networks have many weaknesses related to bit error, network congestion and weak signals that cause segments losses as well as handoff process. For this reason, wireless mobile network TCP cannot distinguish between losses caused by these weaknesses or by the handoff process. So in handoff case, segments losses will trigger congestion control algorithms that reduce the TCP connection's throughput performance. Results: However, in addition to the previous efforts that provide different algorithms and protocols which aim to come up with different solutions and enhancements for the TCP connection in wireless mobile networks when handoff occurs, I am providing in this study Div-TCP protocol that runs the ordinary TCP algorithms with adding more operations that are concerned to handoff. These operations aim to maintain a suitable RTO at each sender to avoid triggering congestions algorithms and also to maintain the sender's throughput by establishing a TCP connection prior to the handoff occurrence. Conclusions/Recommendations: The protocol's discussion shows how end-to-end TCP connection became more efficient since the new Div-TCP connection after handoff will have good and already built TCP connection and the RTO is too much high at all nodes so there is no fear of a that TCP considers congestion.
Highlights
In wireless 802.11 networking, communications take different shapes that connect end to end users using at least one non-wired part of the network
Approach but the whole Div-TCP is considered end-toend TCP protocol. It is important for each node involved in a DivTCP connection to calculate the RTT between itself and solution (Protocol) for improving TCP connection in wireless mobile networks when handoff occurs (Division TCP (Div-TCP)): In order to reach an improvement for TCP connection over wireless mobile networks, the protocol algorithm should consider the previously mentioned wireless mobile network weaknesses and its inability to distinguish between the delay that is caused by handoff, by congestion, or by bit error
Our solution has two goals that collaborate together to cover and reduce handoff effects. It aims to handle handoff process by avoiding the sender to reach Retransmission Time Out (RTO) without receiving acknowledgments of the sent packets in order to avoid going back to slow start by triggering congestion algorithms so we can maintain TCP connection throughput. This is important to be maintained and its have special importance that arises after handoff takes place where the end- to-end nodes become more far to each other
Summary
In wireless 802.11 networking, communications take different shapes that connect end to end users using at least one non-wired part of the network. Mobile and cellular networks are considered wireless networks that have a particular system of components and protocols They are important at this period of time because of their important applications. Wireless 802.11 networks with different topologies suffer from weaknesses in the level of physical and data link layer of communication such as low signal strength, other resources transmission interference and signal fading problem that causes high bit error rate. These problems contribute in disturbing the upper layers protocols especially TCP transport layer protocol
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