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Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 1 Networking Group S. Yin 2 Internet Draft Sh.G. Huang 3 Intended status: Informational BUPT 4 Expires: May 2022 S. Zhou 5 X.K. Meng 6 R. Ma 7 BUPT 8 November 13, 2021 10 Optimization of RWA Problem through OSNR 11 draft-yin-rwa-osnr-09 13 Status of this Memo 15 This Internet-Draft is submitted in full conformance with the 16 provisions of BCP 78 and BCP 79. 18 Internet-Drafts are working documents of the Internet Engineering 19 Task Force (IETF), its areas, and its working groups. Note that 20 other groups may also distribute working documents as Internet-Drafts. 22 Internet-Drafts are draft documents valid for a maximum of six months 23 and may be updated, replaced, or obsoleted by other documents at any 24 time. It is inappropriate to use Internet-Drafts as reference 25 material or to cite them other than as "work in progress." 27 The list of current Internet-Drafts can be accessed at 28 http://www.ietf.org/ietf/1id-abstracts.txt 30 The list of Internet-Draft Shadow Directories can be accessed at 31 http://www.ietf.org/shadow.html 33 This Internet-Draft will expire on May 23, 2022. 35 Copyright Notice 37 Copyright (c) 2018 IETF Trust and the persons identified as the 38 document authors. All rights reserved. 40 This document is subject to BCP 78 and the IETF Trust's Legal 41 Provisions Relating to IETF Documents 42 (http://trustee.ietf.org/license-info) in effect on the date of 43 publication of this document. Please review these documents carefully, 44 as they describe your rights and restrictions with respect to this 45 document. Code Components extracted from this document must include 46 Simplified BSD License text as described in Section 4.e of the Trust 47 Legal Provisions and are provided without warranty as described in 48 the Simplified BSD License. 50 Abstract 52 This documentary provides a kind of routing optimization method. In 53 the basic of RWA solution method, both the output power of the route 54 and the OSNR value of the optical signal noise ratio are considered. 55 The selected optimal route has a lower bit error rate and the whole 56 communication network performance is improved. 58 Table of Contents 60 1. Introduction ................................................ 2 61 1.1. Terminology ............................................ 3 62 2. Conventions used in document ................................. 3 63 3. Overview ....................................... 4 64 3.1. RWA Problem ............................................ 4 65 4. Calculation formula ......................................... 4 66 5. Optimization of RWA problem through OSNR .................... 5 67 6. Formal Syntax ............................................... 6 68 7. Security Considerations .................................. 6 69 8. IANA Considerations ......................................... 6 70 9. Conclusions ................................................. 7 71 10. References ................................................. 7 72 10.1. Normative References ............................. 7 73 10.2. Informative References ......................... 7 74 11. Acknowledgments ............................................ 7 76 1. Introduction 78 RWA is one of the core issues in the optimization of network 79 performance. Currently, due to a variety of physical and technical 80 constraints, optical network cannot provide all the required physical 81 properties, thus the study and solution of the problem plays a vital 82 role to optimize the network and improve the utilization rate of 83 cyber source. 85 The Routing and Wavelength Assignment (RWA) is one of the key 86 problems of the optimization of network performance. At present, the 87 RWA problem is usually solved by being decomposed into the routing 88 sub problem and wavelength assignment problems. 90 However, in the existing solutions of RWA, the allocation of routing 91 and wavelength only considers the network performance such as network 92 throughput, required wavelength, optical fiber number and optical 93 path blocking rate, while the output power and the Optical Signal 94 Noise Ratio (OSNR) index after establishing optical path are not 95 considered. 97 In the long distance transmission of the optical transport network 98 (OTN), the output power and optical signal-to-noise ratio (OSNR) of 99 optical path will seriously affect the BER of communication system, 100 so that the routing based on RWA algorithm is not the best, which 101 impacts the overall network performance of communication system. 103 So this method has taken a comprehensive consideration of the channel 104 output power POUT and the OSNR performance in the existing RWA 105 solution, in order to achieve the optimizing routing. 107 1.1. Terminology 109 RWA: Routing and Wavelength Assignment. 111 Wavelength Conversion: The process of converting an information 112 bearing optical signal centered at a given wavelength to one with 113 "equivalent" content centered at a different wavelength. Wavelength 114 conversion can be implemented via an optical-electronic-optical (OEO) 115 process or via a strictly optical process. 117 OTN: Optical Transport Networks. 119 OSNR: Optical Signal Noise Ratio 121 OLA: Optical Line Amplifier 123 ASE: Amplifier spontaneous emission noise 125 2. Conventions used in this document 127 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 128 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 129 document are to be interpreted as described in RFC 2119 [RFC2119]. 131 3. Overview 133 In dynamic optical transport network, research on the resource 134 optimization and constraint-based routing problem mainly includes the 135 following aspects: 137 (1)path selection and wavelength assignment problem in optical layer. 139 (2)Constraint-based routing problem under dynamic business in Multi- 140 layer network. 142 (3)resource optimization problem under dynamic business in the multi- 143 layer network. 145 3.1. RWA Problem 147 Optical layer path selection and wavelength assignment problem, which 148 is called RWA (Routing and Wavelength Assignment, routing and 149 wavelength assignment) problem, is mainly caused by the require of 150 consistency and constraints of wavelength in the optical fiber link. 152 Optical layer routing based on Dijkstra algorithm is usually started 153 with the different parameters which are chosen refer to the least 154 costly path. Common optical path selection algorithms contain mainly 155 fixed routing algorithm, fixed alternate routing algorithm, adaptive 156 routing algorithm and adaptive shortest alternate routing algorithm. 158 Wavelength assignment algorithm is usually based on heuristic 159 algorithms, aiming to obtain the minimum blocking rate under a 160 certain number of wavelengths. There are several common wavelength 161 assignment algorithms such as randomly assigned wavelength method, 162 first-fit, the minimum application method, the most widely used 163 method and the lightest load method. The core problem of dynamic 164 business constraints routing issue is how to combine electrical and 165 optical layers to find proper routes. 167 4. Calculation formula 169 There are three important formula in this documentary. 171 (1) Output power formula 173 P_out=P_in+SUM[Gi-Li];0