Coded Packet Transport for Optical Packet/Burst Switched Networks

Abstract

This paper presents the Coded Packet Transport (CPT) scheme, a novel transport mechanism for Optical Packet/Burst Switched (OPS/OBS) networks. The CPT scheme exploits the combined benefits of source coding by erasure codes and path diversity to provide efficient means for recovering from packet loss due to contentions and path failures, and to provide non-cryptographic secrecy. In the CPT scheme, erasure coding is employed at the OPS/OBS ingress node to form coded packets, which are transmitted on disjoint paths from the ingress node to an egress node in the network. The CPT scheme allows for a unified view of Quality of Service (QoS) in OPS/OBS networks by linking the interactions between survivability, performance and secrecy. We provide analytical models that illustrate how QoS aspects of CPT are affected by the number of disjoint paths, packet overhead and processing delay.

Two-Code Keying and Code Conversion for Optical Buffer Design in Optical Packet Switching Networks

“…Moreover, the author found a cost-effective encoder based on FBGs that simultaneously generates an OCDMA signal and its complementary counterpart. For future works, the authors aim to adopt channel coding in OPS as a solution to resolve packet contention, prevent packet loss, as well as enhance network security [20]. Except for simply considering the capacity, investigating other physical constraints in OPS such as survivability, secrecy, and processing would give more adequate insights for optical buffer systems.…”

Dynamic Wavelength Grouping for Quality of Service in Optical Packet Switching

“…• packet aggregation schemes [20] such as Composite Packet Aggregation and Non-Composite Packet Aggregation (CPA and NCPA), and Optical Packet-switching Over wavelength ROuted Networks (OPORON) [21]; • wavelength reservation schemes: Additional Wavelengths (AWs) for the same traffic [22] and Wavelength Access Restriction (WAR) [23]; • supplementary resource reservation: Egress Coordination OPS (EGCOPS) [24], Contention Less Transmission OPS (CLTOPS) [25] and Multi-Fiber (MF) Allocation [26]; • drop-based schemes: Intentional Packet Dropping (IPD) [28], and Preemptive Drop Policy (PDP) [28]; • routing-based schemes: Deflection Routing (DR) [29], Intelligent Deflection Routing (iDef) [30], Multi-Path Routing (MPR) [29] and Shortest Hop-Path (SHP) [31]; • access limitation: FDL-access limitation [32] and Distribution-based bandwidth Access (DA) [33]; • other schemes and solutions: Coded Packet Transport (CPT) Scheme [27], QoS Differentiation over MPLS [34], use of Wavelength Converters (WCs) [35].…”

Quality of Service (QoS) improving schemes in optical networks

“…The scheme exploits non-systematic Reed Solomon code and path diversity to provide a non-cryptographic secrecy and low packet loss rate when contentions or path failures occur [24]. It presents the relationship between performance PLR, secrecy (ability to withstand targeted); and survivability (link failure).…”

“…CPT scheme makes use of ( , ) Reed Solomon (RS) code as an erasure code and path diversity to recover packet loss due to contentions and path failure in optical networks [24]. To achieve a noncryptographic secrecy, an optimal coding matrix computed over GF (2 ), where = 2 − 1 is used.…”

“…6. For example, let us consider the number of disjoint paths = 3, packet overhead ratio = 1 and RS code (24,12) over GF (2 8 ) which implies that = 12 and = 12. To achieve both survivability and secrecy, 8 packets are sent over the three disjoint paths.…”