Optimal Load Balancing Linked Increased Algorithm for Multipath TCP

The most commonly used mechanism for establishing a connection between two communicating entities is transmission control protocol (TCP) that provides a reliable connection. Due to the latest developments in communication technologies, one can use multiple connections in a network using Wi-Fi, LTE/HSPA, etc. Since the single path TCP (SPTCP) provides a single connection at a time, it cannot take the benefit of multiple connections. The multipath TCP (MPTCP) can this problem by dividing a flow into multiple subflows; each may use a different network connection. Thus, it has a great capability to achieve high throughput in comparison to the SPTCP. The existing MPTCP congestion control algorithms have different issues like TCP-friendliness, responsiveness, and load balancing. To address these issues, this paper proposes a new MPTCP congestion control algorithm, named as optimal load balancing linked increased algorithm (OLBLIA), that considers the congestion window corresponding to a path that is least congested. The window corresponding to the least congested path is increased with maximum size (i.e., nearly equal to the congestion window of SPTCP in the best path) that makes it more responsive and friendlier towards the SPTCP. Experimentally and analytically it is shown that the proposed OLBLIA resolves the above mentioned issues and outperforms the existing MPTCP’s congestion control algorithms.