- Open Access
An improved multipath MANET routing using link estimation and swarm intelligence
© R and N. 2015
Received: 27 December 2014
Accepted: 13 May 2015
Published: 18 June 2015
Routing in ad hoc networks is challenging as nodes are mobile and links are continuously created and broken. Current on-demand ad hoc routing algorithms start route discovery after path break, incurring high cost to detect the disconnection and to establish a new route. Specifically, when a path is liable to break, the source is warned about the likelihood of disconnection. The source then starts path discovery avoiding disconnection entirely. A path is likely to break when link availability decreases. Since routing is nondeterministic polynomial (NP) hard, this work proposes an improved ad hoc on-demand multipath distance vector (AOMDV) based on link availability, neighboring node’s queuing delay, node mobility, and bit error rate. The optimal path is selected using BAT meta-heuristic optimization. Simulation shows improved performance compared to AOMDV.
With emerging mobile applications [1–3], mobile ad hoc networks (MANETs) have attracted research from various groups due to its flexibility and usability in diverse applications. A MANET is a self-configuring temporary network of mobile nodes which are independent with each other and do not have any fixed infrastructure. MANETs do not control or regulate traffic  within the network but utilize the intermediate node’s routing capability. Since source and destination nodes use intermediate nodes as routers, a routing path must be established for actual communication. Routing protocols are the key to MANET success and are an active area for MANET research [5–9].
Many routing protocols have been proposed for ad hoc networks in literature which find a route based on given criteria for packet delivery from source to destination. In literature, routing protocols are broadly classified as table-driven protocols and on-demand protocols. In the former, also called proactive routing protocols, every node maintains a table of data containing routing information such that source can reach any node in the destination if a route exists. Popular table-driven protocols include optimized link state routing (OLSR) and destination sequenced distance vector (DSDV). In on-demand routing protocols, routes are created as and when needed. They are also called as reactive protocols, and the source invokes route discovery process when data has to be transmitted. A route is valid till destination is reached or until route is not required. Popular existing on-demand routing protocols include dynamic source routing (DSR) and ad hoc on-demand distance vector AODV [10, 11] protocol.
In AODV, [12, 13] a source node broadcasts route request (RREQ) to its neighbors. When adjacent nodes received RREQ with source node and target node addresses, it judges if it is the target. If yes, it sends a route reply (RREP); otherwise, it checks if it has active route to the destination in its table. If it has a fresh route, then it sends RREP to the source or it continues flooding by sending RREQ. AODV protocol discovers neighborhood nodes through regular broadcast of hello messages. When a link breaks, it sends route error message while deleted/broken records are repaired.
Ad hoc on-demand multipath distance vector (AOMDV)  is an AODV extension for computing multiple loop-free and link-disjoint paths. The routing table for destination includes a list of next hops and the number of hops to reach the destination. In AOMDV, all the available next-hop neighbors are assigned the same sequence numbers. A node maintains advertised hop count for every destination, and this hop count sends destination route advertisements. Every duplicate route advertisement that has been broadcasted and received by a node defines an alternative destination path.
A node accepts an alternative destination path—to ensure loop freedom—only when the hop count it has is lower than advertised hop count. To locate disjoint routes, a node does not reject duplicate RREQs immediately. Every RREQ has an additional field called first hop indicating its first hop. Also, a node maintains a first-hop list for every RREQ to track list of neighbors of source through which a RREQ copy was received. To ensure link disjoints in RREP’s first hop, destination replies only to RREQs arriving through unique neighbors. Every RREP trajectory may intersect at an intermediate node, but each goes on a different reverse path to source ensuring link disjointness .
1.1 Related works
A multipath routing protocol proposed by Obaidat et al.  is a variant of single-path AODV routing protocol. The proposed method established node-disjoint paths with lowest delays based on interaction of factors from various layers. The proposed protocol’s performance was investigated and compared to single-path AODV and multipath AOMDV protocols using Operations Network (OPNET). Results show improved performance of the proposed method in terms of throughput and end-to-end delay.
Adaptive multi-metric (AM)-AOMDV, an improved AOMDV based on multiple metrics, was proposed by Khimsara et al., . AM-AOMDV extends AOMDV by including many route metrics, a new local route update, and route maintenance algorithm. The latter uses one-hop information exchange between one-hop nodes to improve route longevity. The modified technique improved packet delivery ratio and decreased end-to-end delay. Significant improvement was also found in route discovery frequency and routing overhead during node mobility. Multiple metrics ensure routing scheme convergence to most efficient route during transmission and avoided creation of hotspots.
Mallapur and Patil  proposed a Stable Backbone-based Multipath Routing Protocol (SBMRP). In the proposed protocol, candidate nodes were selected based on available bandwidth, link quality, node mobility, and available power. Source-destination paths were established through candidate nodes, to form a routing backbone. When a candidate node fails in a path due to lack measure values, another candidate node is used to create an alternate path. Simulation proved that the new technique reduced overhead, packet drop, and energy while increasing packet delivery rate.
Yu et al.  proposed Link Effective Available Time (LEAT). The method aimed to locate a link available time during epoch through measurement of distances between a mobile link’s two nodes rather than using localization information. A new routing link cost was proposed which lowered link breakage. Routing was formulated as an optimal routing problem based on new cost, using a heuristic algorithm. Simulation shows that LEAT improved network performance in delay, hop counts, and throughput when compared to present routing algorithms.
Yu and Bao  proposed a new link cost to reduce breakages during data service. To reduce implementation complexity, the authors used only ranging information in link availability and avoided localization information. Routing was formulated, based on new metrics, as an optimal routing problem, needing a heuristic algorithm. Simulation proved that RBLAR improved link connectivity by reducing link breaks and improved network performance. Considering link reliability in route choice was proposed by Yelemou . Route request procedure was modified to enable reliable paths using bit error rate (BER). Simulations showed the proposed system outperformed AOMDV even in conditions like mobility and multi-communication.
Chen et al.,  extended AOMDV routing protocol to accommodate channel fading. The new channel-aware AOMDV (CA-AOMDV) used channel average nonfading duration as routing metric to choose stable links for path discovery applying a pre-emptive handoff strategy to ensure reliable connection. Using this information, paths when available were reused and not discarded. The proposed system ensured lower downtime. The authors also showed via simulations common network performance measures, with good insights into differences in performance between CA-AOMDV and AOMDV.
Link availability estimation was used to select most stable route from alternate paths was proposed by Mazumdar et al.  and was implemented in AOMDV for route selection. Results show that selecting stable route leads to a higher throughput in dynamic network topologies.
Node mobility is a major factor link stability in MANETs. Cai and Liu  suggested Prediction of Link Stability-AOMDV (PLS-AOMDV) based on AOMDV multipath routing protocol that periodically predicted link stability by considering both node mobility and energy consumption to choose a high stability link. Simulation shows that PLS-AOMDV improved packet delivery rate.
Energy-efficient (EE)-AODV routing protocol that is an enhancement of current AODV routing protocol was proposed by Singh and Gupta . Routing algorithm adopted by EE-AODV enhanced RREQ and RREP process to save mobile devices energy. EE-AODV considers a threshold energy level as minimum energy which must be available with a node for use as an intermediary node. When node energy reaches the threshold level, it would not be considered an intermediary node unless alternative paths are unavailable. Simulation shows that network life increased in EE-AODV compared to AODV.
Gunes et al.  proposed a swarm intelligence-based multipath routing protocol using ant colony optimization. The proposed algorithm reduced the routing overheads compared to traditional multipath routing protocol. Liu and Feng  used ant colony optimization meta-heuristic on the node-disjoint multipath routing problem. The proposed algorithm concurrently sends data via multiple paths. Ziane and Melouk  extensively investigated multipath routing for multimedia data using swarm intelligence. Meta-heuristic techniques have been extensively used in wired and wireless networks including wireless sensor network, multicast routing [29–31].
Yen et al.  proposed a multi-constrained quality of service (QoS) multicast routing method using genetic algorithm. The proposal will be flooding-limited using the available resources and minimum computation time in a dynamic environment. By selecting the appropriate values for parameters such as crossover, mutation, and population size, the genetic algorithm improves and tries to optimize the routes. Simulation results indicate its better performances compared to other methods.
Song et al.  exploited a biological model of Physarum to design a novel biology-inspired optimization algorithm for minimal exposure problem (MEP). First, formulate MEP and the related models and then convert MEP into the Steiner problem by discretizing the monitoring field to a large-scale weighted grid. Inspired by the path-finding capability of Physarum, the authors developed a biological optimization solution to find the road-network with minimal exposure among multiple points of interest. POA can also be used for solving the general Steiner problem. Extensive simulations demonstrate that the proposed models and algorithm are effective for finding the road-network with minimal exposure and feasible for the Steiner problem .
Li et al.  proposed a reliable multicast protocol, called CodePipe, with advanced performance in terms of energy efficiency, throughput, and fairness in lossy wireless networks. Built upon opportunistic routing and random linear network coding, CodePipe not only simplifies transmission coordination between nodes but also improves the multicast throughput significantly by exploiting both intra-batch and inter-batch coding opportunities. In particular, four key techniques, namely LP-based opportunistic routing structure, opportunistic feeding, fast batch moving, and inter-batch coding, are proposed to offer substantial improvement in throughput, energy efficiency, and fairness. CodePipe was evaluated on NS2 simulator by comparing with other two state-of-the-art multicast protocols, MORE and Pacifier. Simulation results show that CodePipe significantly outperforms both of them.
The importance of routing in disruptive tolerant network, cognitive network, mesh network, and wireless sensor network has been extensively discussed in [33, 36–48]. From literature survey, it can be observed that link quality plays a very important role for obtaining better QOS in multipath routing protocols. Routing being nondeterministic polynomial (NP) hard, various meta-heuristic-based routing algorithms have also been proposed in literature using swarm intelligence meta-heuristic. Popular meta-heuristic algorithms including genetic algorithm and particle swarm optimization (PSO) have shown to have drawbacks when the solution to be found is multimodal. In this work, it is proposed to investigate an improved AOMDV algorithm based on link quality and BAT meta-heuristic which has been shown to perform well for multimodal optimization problems.
Using Little’s theorem, equation (9) can be solved and a probability-based model can also be derived. If routes are selected based only on link quality, load balancing becomes a major issue.
In this work, the BAT meta-heuristic is used to select the optimal route such that the objective is minimized. Xing-She Yang proposed BAT algorithm (BA) , which imitates micro bat’s echolocation behavior. Bats are the only mammals that fly and have advanced echolocation capabilities using short-frequency modulated signals which help it to identify obstructions. Micro bat is an example though all species use echolocation extensively. Bats emit a loud sound pulse and listen to resulting echo which bounces back from surrounding objects. The algorithm is based on the way micro bats fly to find food and avoid objects. The process of BAT algorithm is given by:
Random solution created can be
S → N1 → N6 → N7 → N8 → D
S → N1 → N4 → D
S → N3 → N4 → N5 → D
Based on network parameters, the best solution obtained is the route S → N1 → N4 → D, then a local search is initiated such that part of the route tree is changed. For example, a feasible solution obtained from local search can be represented by
S → N1 → N6 → D
BAT parameters used
Maximum number of generations
2 Results and discussion
Simulation parameters used in this work
MAC layer protocol
Number of nodes used in simulation
Transmission range of node
Random way point
1200 × 800 m
Constant bit rate (CBR)
Delays obtained in the network
Average end-to-end delay in seconds
Node pause time in seconds
Average jitter in seconds
Node pause time in seconds
Bat meta-heuristic is able to converge faster and was able to find an optimal solution in less than 50 iterations.
This work proposed improvements in AOMDV based on Link Quality. A link estimation algorithm-based AOMDV was proposed (LQ-AOMDV). The proposed LQ-AOMDV was optimized to obtain optimal solutions. A novel objective function was proposed to balance the load across the network and improve the network performance. Simulations results show that PDR of proposed BAT-AOMDV improved when compared to AOMDV and LQ-AOMDV. Average BAT-AOMDV values increased by 10.2 % when compared to AOMDV and increased by 2.17 % when compared to LQ-AOMDV. Further investigation is necessary to lower end-to-end delay.
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