arXiv subjects

Ahmed E. Kamal

Publications and source records attributed to Ahmed E. Kamal.

24 records · Page 2Linked to original sources

arXiv2009

Encoding of Network Protection Codes Against Link and Node Failures Over Finite Fields

Link and node failures are common two fundamental problems that affect operational networks. Hence, protection of communication networks is essential to increase their reliability, performance, and operations. Much research work has been done to protect against link and node failures, and to provide reliable solutions based on pre-defined provision or dynamic restoration of the domain. In this paper we develop network protection strategies against multiple link failures using network coding and joint capacities. In these strategies, the source nodes apply network coding for their transmitted data to provide backup copies for recovery at the receivers' nodes. Such techniques can be applied to optical, IP, and mesh networks. The encoding operations of protection codes are defined over finite fields. Furthermore, the normalized capacity of the communication network is given by $(n-t)/n$ in case of $t$ link failures. In addition, a bound on the minimum required field size is derived.

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arXiv2009

Network Coding-Based Protection Strategy Against Node Failures

The enormous increase in the usage of communication networks has made protection against node and link failures essential in the deployment of reliable networks. To prevent loss of data due to node failures, a network protection strategy is proposed that aims to withstand such failures. Particularly, a protection strategy against any single node failure is designed for a given network with a set of $n$ disjoint paths between senders and receivers. Network coding and reduced capacity are deployed in this strategy without adding extra working paths to the readily available connection paths. This strategy is based on protection against node failures as protection against multiple link failures. In addition, the encoding and decoding operational aspects of the premeditated protection strategy are demonstrated.

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arXiv2008

Network Protection Codes Against Link Failures Using Network Coding

Protecting against link failures in communication networks is essential to increase robustness, accessibility, and reliability of data transmission. Recently, network coding has been proposed as a solution to provide agile and cost efficient network protection against link failures, which does not require data rerouting, or packet retransmission. To achieve this, separate paths have to be provisioned to carry encoded packets, hence requiring either the addition of extra links, or reserving some of the resources for this purpose. In this paper, we propose network protection codes against a single link failure using network coding, where a separate path using reserved links is not needed. In this case portions of the link capacities are used to carry the encoded packets. The scheme is extended to protect against multiple link failures and can be implemented at an overlay layer. Although this leads to reducing the network capacity, the network capacity reduction is asymptotically small in most cases of practical interest. We demonstrate that such network protection codes are equivalent to error correcting codes for erasure channels. Finally, we study the encoding and decoding operations of such codes over the binary field.

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arXiv2008

Network Protection Codes: Providing Self-healing in Autonomic Networks Using Network Coding

Agile recovery from link failures in autonomic communication networks is essential to increase robustness, accessibility, and reliability of data transmission. However, this must be done with the least amount of protection resources, while using simple management plane functionality. Recently, network coding has been proposed as a solution to provide agile and cost efficient network self-healing against link failures, in a manner that does not require data rerouting, packet retransmission, or failure localization, hence leading to simple control and management planes. To achieve this, separate paths have to be provisioned to carry encoded packets, hence requiring either the addition of extra links, or reserving some of the resources for this purpose. In this paper we introduce autonomic self-healing strategies for autonomic networks in order to protect against link failures. The strategies are based on network coding and reduced capacity, which is a technique that we call network protection codes (NPC). In these strategies, an autonomic network is able to provide self-healing from various network failures affecting network operation. The techniques improve service and enhance reliability of autonomic communication. Network protection codes are extended to provide self-healing from multiple link failures in autonomic networks. We provide implementation aspects of the proposed strategies. We present bounds and network protection code constructions. Finally, we study the construction of such codes over the binary field. The paper also develops an Integer Linear Program formulation to evaluate the cost of provisioning connections using the proposed strategies.

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arXiv2008

Protection Schemes for Two Link Failures in Optical Networks

In this paper we develop network protection schemes against two link failures in optical networks. The motivation behind this work is the fact that the majority of all available links in an optical network suffer from single and double link failures. In the proposed network protection schemes, NPS2-I and NPS2-II, we deploy network coding and reduced capacity on the working paths to provide backup protection paths. In addition, we demonstrate the encoding and decoding aspects of the proposed schemes.

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arXiv2008

Network Coding-based Protection Strategies Against a Single Link Failure in Optical Networks

In this paper we develop network protection strategies against a single link failure in optical networks. The motivation behind this work is the fact that $%70$ of all available links in an optical network suffers from a single link failure. In the proposed protection strategies, denoted NPS-I and NPS-II, we deploy network coding and reduced capacity on the working paths to provide a backup protection path that will carry encoded data from all sources. In addition, we provide implementation aspects and how to deploy the proposed strategies in case of an optical network with $n$ disjoint working paths.

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