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In this paper, we consider the cross-layer design of a cooperative medium access control (MAC) protocol for wireless ad hoc networks. In particular, we propose a cooperative MAC protocol which can work either in the cooperative transmission mode for unidirectional traffic or physical-layer network coding (PNC) mode for bidirectional traffic. By designing a suitable control frame exchange the proposed...
We consider a scenario consisting of a primary and a secondary system, each represented by a pair of a transmitter and a receiver. The secondary transmitter assists in the retransmission of the primary message, which prevents the primary performance from being degraded by allowing the secondary system to access the transmission resources. Two network coding schemes applied in retransmission phase...
Many wireless systems have leveraged the cooperation of nodes to improve network capacity. However, these approaches have left uncertainty over the performance gain of spatial diversity either with protocol overheads or unrealistic assumptions. Also more practical relay selection algorithm is required to be simple and totally distributed. In this paper, a CSMA-liked queue length based algorithm is...
Network coding combines several packets from different sources and broadcasts the combined packet to several destinations in single transmission time slot. Each destination is capable to extract the intended information by decoding from a common packet. In short, network coding improves the throughput for wireless and wired networks but also causes side effects such as complexity of packets management...
An underwater communication channel is a challenging medium for wireless data transmissions, so underwater acoustic networks often suffer from high packet loss. Implementing network coding in underwater environment is a promising technique to increase channel throughput and reduce data loss by transmitting packets that contain data from different source nodes. The purpose of the research is to increase...
In order to improve the throughput, robustness and resource utilization of relay network, we develop a new high-efficiency and stable two-way relay system with double antenna relay node, which employs combining Maximum Likelihood(ML) detection and Network Coding during access and broadcast stage respectively. It is not sensitive to link asymmetry compare with physical network coding(PNC), and can...
In this paper, Fulcrum network codes are introduced as a viable solution to cope with the heterogeneity of 5G communication and storage systems. Fulcrum network codes are an enhancement of random linear network codes (RLNC) offering high throughput performance at low overhead. This contrasts with state of the art solutions that only offer a trade-off between performance and overhead. Additionally,...
IEEE 802.11 infrastructure wireless local area network (WLAN) is increasingly popular, in which access points (APs) are applied. In a WLAN with an AP connected to the Internet, the communication between any two nodes is relayed by the AP, i.e., the AP serves all the nodes in the WLAN, which degrades throughput. In this paper, we propose a novel network coding scheme called MPOF that is able to encode...
This paper deals with the retransmission protocol design for cognitive radio networks by exploiting the primary hybrid ARQ. In contrast with previous work that focuses on cancellation based retransmissions, we propose a novel cooperative coding based retransmission protocol for cognitive radio networks. The design objective is to improve the throughput of the primary user and create the transmission...
Network coded opportunistic routing (NCOR) is a potential communication paradigm in wireless multi-hop networks (WMN) with lossy links. It leverages the multipath diversity of wireless networks and applies network coding to resist random erasures. Related optimization work minimizing transmission cost or maximizing throughput are based on the collision-free assumption, which either requires perfect...
Transmission control is an important issue in the Internet or other computer networks today. The retransmission scheme in TCP cannot have the best throughput in the network scenarios with more wireless links or complicated topologies. Some related works proposed the solution by network coding. Network coding is suitable for generate the redundant data for error correction. In this paper, we discussed...
In this paper we proposed a novel method called network coding combined with cooperative relaying technique in cellular communication system, it aims to improve the network throughput and to enhance the spectral efficiency for the next generation wireless networks. We had analyzed the performance of decode and forward relaying. Here introduced a combined scheme of network coding and cooperative relaying...
Intra-flow network coding was proposed in recent years as a way of enhancing TCP performance over wireless networks. Transmission reliability is improved by sending redundant coded packets instead of retransmitting data packets. In this paper, we discuss the complex issue of TCP interaction with network coding and identify how network coding hides indistinctively link and congestion losses from TCP...
Opportunistic routing with intra-session network coding (NCOR) is a promising communication paradigm in wireless multi-hop networks with lossy links. Unlike traditional routing protocols, which use a single path to route traffic between node pairs, NCOR broadcasts data packets to a set of forwarding candidates. Each candidate combines the overheard packets to generate linearly independent packets,...
Network coding (NC) is a promising method used to achieve the channel capacity and enhance the reliability of multicast networks. However, the general wireless multicast networks based on NC are facing big problems such as long delays and large computational complexities. We propose a multicast network based on Batched sparse (BATS) codes which can efficiently solve these problems. Since fountain...
An increasing number of streaming applications need packets to be strictly in-order at the receiver. This paper provides a framework for analyzing in-order packet delivery in such applications. We consider the problem of multicasting an ordered stream of packets to two users over independent erasure channels with instantaneous feedback to the source. Depending upon the channel erasures, a packet which...
A limiting factor for the performance of coded packet networks is the inherent arithmetic complexity of network coding. This is in particular true for high-throughput networks such as IEEE802.11n/ac, but also for lower throughput embedded and mobile systems as well as for alternate applications of network coding such as replication of data in distributed systems. While arithmetic complexity is normally...
An important challenge for the implementation of network coding in IEEE 802.11-based wireless networks is to give additional priority for channel access to the relay stations responsible for coding. These relay stations are able to provide more information in a single transmission than those that forward single packets, hence improving throughput and energy efficiency. The Distributed Coordination...
Cooperation among nodes plays an important role in the commercial development of wireless networks. Efficient cooperation should include not only encouraging selfish nodes to forward packets for one another but also selecting optimal transmission methods. Therefore, in this paper, in order to improve network performance, we propose a social-oriented adaptive transmission scheme for wireless ad hoc...
In random linear network coding, rate control is an important strategy for limiting the decoding delay of a system. In broadcast systems where the channel rate is either unknown or varies over time, we demonstrate that a target delay can be achieved using the queue threshold scheme that we introduce. At throughputs approaching the channel rate, the queue threshold rate control scheme is shown to achieve...
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