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This paper presents an energy saving technique for optical networks without loss of dignity of Quality of service. This paper emphasis on the energy minimization of technologies in optical network. ...

This paper presents an energy saving technique for optical networks without loss of dignity of Quality of service. This paper emphasis on the energy minimization of technologies in optical network. One simple method toconsume energy is to switched off an unused element, so the power consumption cuts by around 20% and network resources saved by 29%.



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  • 75 ICRTEDC -2014 Vol. 1, Spl. Issue 2 (May, 2014) e-ISSN: 1694-2310 | p-ISSN: 1694-2426 GV/ICRTEDC/18 IMPROVING ENERGY EFFICIENCY IN OPTICAL NETWORKS Roop kamal kaur Gurukul Vidyapeeth Institute of Engineering and Technology, Banur Abstract-This paper presents an energy saving technique for optical networks without loss of dignity of Quality of service. This paper emphasis on the energy minimization of technologies in optical network. One simple method to consume energy is to switched off an unused element, so the power consumption cuts by around 20% and network resources saved by 29%. The efficient solution for minimizing energy consumption is optical burst switching. It can be done by modifying the number of OBS (optical burst switched) parameters. For transparent optical network, we use the cluster based architecture for minimizing the energy consumption. In this paper, we study the new techniques for energy consumption. Keywords: Optical network, Core network, Energy management, OBS network, QoS. I. INTRODUCTION A data network built on fibre-optics technology, which sends data digitally, as light, through connected fibre stands. Optical networks offer an enormous increase in both transmission capacity and speed from traditional copper wire-based networks. Some techniques are defined in this paper that improves the energy efficiency in the optical networks. Through an optical network uses the light as a transmission medium and this network is the fastest conveying network. It works by using an optical transmitter device to convert an electrical signal received from a network node into light pulses, which are then placed on a fibre optic cable for transport to a receiving device. Optical Network can be used for providing high bandwidth. Optical Networks are high capacity networks. Unlike copper based networks, the light pulses of an optical network may be transported quite a distance until the pulses are regenerated through an optical repeater device. When a signal is delivered over the network to destination, then it is converted into an electrical signal through an optical receiver device and sent to a recipient node. Moreover, an optical network is less prone to external inference and attenuation and can achieve substantially higher bandwidth speeds than copper networks. Optical fibres typically include transparent core surrounding by a transparent cladding with a lower index of refraction. Fibres that support many transverse modes are called multi-mode fibres (MMF), while other support single mode is called single-mode fibres. Fig1. Generic operator network architecture and domains covered by TREND. Fig2. Telecoms Network Hierarchy Advantages a. Large Bandwidth Distance Product. b. Very low cost per unit bandwidth. c. Immunity to noise and interference. d. Tapping of signal from fibre without being detected-difficult. Due to these advantages, Optical fibre networks have high capacity. It can be used for providing the high bandwidth services. All optical networks are Broadcast and switched. In Broadcast network, optical signal is transmitted and received by everyone. In Switched networks, Optical signal is transmitted and switched through a specific path and received by the designated receiver.
  • ICRTEDC-2014 76 II. CORE NETWORK Core network is usually referred to a backbone infrastructure of a telecom network that interconnects large cities. Core network can carry huge amount of traffic and is based on pattern of mesh interconnection. Some Optical technologies are used in core network to support basic physical infrastructure and can achieve high speed, scalability, high capacity. Fig3. Core Network To manage optical network various high-level management technologies and equipments have been developed. For Example, network architectures over SONET/ SDH (Synchronous Digital Hierarchy) and IP over WDM (wavelength-Division Multiplexing). Fig4. Telecommunication Networks III. RELATED WORKS IV. For an Optical networks, some potential energy savings are evaluated with full wavelength capability. The main method is to switched off unused resources so that more power consumption is reduced, since in [1] active links and nodes can be reduced up to 25%. With the help of anycast principle, we can judge the additional effect on energy budget. Anycast principle is better than unicast principle. Another method is cluster based architectures in which sleep mode is adopted by core nodes. Wavelength routing path acts as intermediate node which does not take any new light paths. When sleep mode is used then network connectivity deceases and lost request increases. In this method, nodes are divided into disjoints sets and single cluster is formed by more than one nodes. These clusters can be set in a way so that they can adopt a sleep mode which is initiated by the optical control plane. When the mode of a cluster is sleep, then the network connectivity decreases and more requests will drop. For decreasing the dropping of requests, new technique is proposed called any casting communication paradigm. By using any casting communication, single destination is selected from the desired set of destination. Because of intermediate node that belongs to cluster in an OFF state, a destination cannot be reached but by using unicasting, a next available destination can be chosen. Destination which is chosen can be at longer distance that increases the bit-error-rate (BER) and propagation delay. a. Energy per bit Here, we calculate the amount of energy to transmit an optical bit across WRN. Two approaches are used, (a) Energy associated with the transmission of one bit over fibre, (b) Energy consumed by a router (WRN) for switching an optical signal. The Total average time to transmit 1 bit (optical) over a channel is the inverse of the average bit rate (B). Fig5. Wavelength routed node used in network architecture According to the number of amplifiers used and loss in the signal power, Optical signals and ASE powers will vary. Based on the network architecture figure shown, we can calculate energy per bit required to transmit an optical bit across the WRN. b. Optical Burst Switching Optical Burst switching is an optical networking technique that allows dynamic sub-wavelength switching of data. Optical Burst switching is viewed as a comprise between the yet unfeasible full optical packet switching (OPS) and the mostly static optical circuit switching (OCS). OBS is different because OBS control information is sent separately in advance in optical channel and then to allow the timely setup of an optical light path to transport the soon-to-arrive payload, those control signals can electronically processed. This is known as delayed reservation. V. ENERGY EFFICIENT ROUTING ALGORITHM Energy Efficient Routing (EER) Algorithm also helps to provide the necessary QoS for established route. The time duration in which an WRN cuts off the traffic routed through it and adopts an OFF state is called a sleep cycle.
  • 77 ICRTEDC -2014 Energy consumption costs can be reduced by the sleep cycles. WRNs are relatively switched off so that transient traffic is not allowed but traffic from source to destination is handled. Quality of service (QoS) can degrade in terms of bit-error-rate and propagation delays due to these sleep cycles. a. Burst Header Packet Signalling Network Element Vector (NEVs) can be maintained by using Burst Control Packet (BCP), or Burst Header Packet (BHP) and update them as they traverse each network element (NE), in this case WRN. Fig6. Burst Header Packet Fields Used in EER algorithm [6],[7] At each network element , the source, destination set and , NEV fields are updated. Now the new NEV is compared with the threshold field and depending on the threshold requirement, the bursts are scheduled or dropped. In this paper, we have reviewed the various techniques to minimize the energy consumption in optical networks. These can further be enhanced and implement using NS2. VI. CONCLUSION In this paper we proposed an energy efficient and routing approach for optical networks, which cuts off ideal network elements. By using this approach the energy will be conserved. In optical channel required energy is transmitted using bits. By using BHP signalling and anycast communication the energy will be minimized and conserved. Sleep cycles are proposed for WRN. Using the sleep mode 30 to 60% energy will be conserved. We have also defined an Energy efficient Routing algorithm for minimising power consumption. Further work can be enhanced by using load balancing approach for sleep mode. REFERENCES 1. S. Aleksic, “ Analysis of power consumption in future high- capacity network nodes” , J. Opt. Commn. Network. 2. M.Pickavet, et al., “Worldwide energy needs for ICT: the rise of power-aware networking”, Proc. 2nd Int. Symp. Advanced Netw. Nd Telecommn. Systems (ANTS 2008), 15-17 Dec.2008 3. L. Chiaraviglio, M. Mellia, F. Neri, “Energy-aware backbone networks: a case study”, Proc. 1s int. Workshop on Green Comm.. at IEEE Int. Conf. Commn. (ICC 2009), 18 Jun. 2009. 4. S. Aleksic, "Analysis of power consumption in future high- capacity network nodes", J. Opt. Comm. Netw. 5. C. Cavdar, F. Buzluca L. Wosinska, "Energy-efficient design of survivable WDM networks with shared backup", Proc. IEEE Global Telecommun. Conf. (Globecom 2010), 6-10 Dec. 2010. 6. B. G. Bathula, “QoS aware quorumcasting over optical burst switched networks,” Ph.D. dissertation, Indian Institute of Science, 2008. 7. B. G. Bathula and J. M. H. Elmirghani, “Providing QoS for anycasting over optical burst switched grid networks,” in Proc. LNICST, GridNets-2008, Beijing, China, Oct. 2008. 8. “Constraint based anycasting over optical burst switched (OBS) networks,” to appear in IEEE/OSA Journal of Optical Communication and Networks, vol. 9, no. 2, 2009. 9. J. P. Jue and V. M. Vokkarane, Optical burst-switched networks. Germany: Springer, Optical Networks Series, 2005. 10. N. Ghani, S. Dixit, and T. S. Wang, “On IP-over-WDM integration,” IEEE Commun. Mag., vol. 38, no. 3, pp. 72– 84, Mar. 2000. 11. J. Manchester, J. Anderson, B. Doshi, and S. Dravida, “IP over SONET,” IEEE Commun. Mag., vol. 36, no. 5, pp. 136–142, May 1998. 12. W. Vereecken, L. Deboosere, D. Colle, B. Vermeulen, M. Pickavet, B. Dhoedt, and P. Demeester, “Energy efficiency in telecommunication networks,” European Conference on Networks and Optical Communications & Optical Cabling and Infrastructure (NOC’08), July 2008. 13. M. Pickavet, W. Vereecken, S. Demeyer, P. Audenaert, D. Colle, C.Develder, and P. Demeester, “Contribution and role of network architectures in the footprint reduction of ICT,” NOC/OC&I’09, Valladolid, Spain, June 2009.