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Network Working Group                                       Weiqiang Cheng
Internet Draft                                                        CMCC
Intended status: Informational
Expires: January2015
                                                                 Yunbin Xu
                                                                      CATR

                                                             Guoying Zhang
                                                                      CATR

                                                             July 21, 2014


       ACTN Use-cases for Packet Transport Networks in Mobile Backhaul
                                   Networks
                   draft-cheng-actn-ptn-requirements-00.txt


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   Copyright (c) 2014 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info)in effect on the date of


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Internet-Draft      PTN requirements in ACTN architecture      July 2014
   publication of this document. Please review these documents
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   This document is subject to BCP 78 and the IETF Trust's Legal
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Abstract

   This document describes the key requirements for ACTN in carrier's
   transport networks, which mainly focus on the Packet Transport
   Networks.

Table of Contents


   1.    Introduction................................................3
   2.    ACTN Requirement for Packet Transport Networks..............3
    2.1. End-to-End Enterprise Services Provisioning.................3
    2.2. Multi-layer coordination Requirement in L2/L3 Packet Transport
   Networks..........................................................4
    2.3. Optimizing the network resources utilization................4
   3.    Virtual Networks Operations for Packet Transport Networks...5
   4.    Security Considerations.....................................5
   5.    IANA Considerations.........................................6
   6.    References..................................................6
   6.1. Informative References......................................6




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1. Introduction


   MPLS-TP based packet transport network (PTN) has been widely used as
   mobile backhaul and enterprise customer private line/LAN solutions
   in many carrier's networks. The Packet Transport Networks work in
   different layers from L2 to L3 and in different areas such as access,
   metro and backbone networks. In the application scenarios, the most
   important requirements for operators are to solve the
   interoperability problems between multi-domain/multi-layer networks,
   realize the fast service provisioning, and improve the network
   operation efficiency.

   The PTN operators may use ACTN to improve efficiency of provision
   and operation, optimize the resources utilization, and promote the
   customer's experiences. This draft mainly discusses the key
   requirements for ACTN in carrier's Packet Transport Networks.

2. ACTN Requirement for Packet Transport Networks

2.1.   End-to-End Enterprise Services Provisioning

   The enterprise customer services are sensitive to the network
   quality, have strict time-limit requirement for service
   establishment. Faster end-to-end service provisioning may make the
   operators win the competition.

   The operators had built a large scale of packet transport networks
   and divided them into different areas such as access, metro and
   backbone networks, each area has their own management systems.
   Currently in most application scenarios, PTN networks are using
   static provisioning with centralized Network management Systems
   (NMS). However, they are hard to meet the requirements of current
   enterprise services for fast provisioning and efficient operation.

   The ACTN architecture [ACTN-FWK] should be considered to coordinate
   with traditional the networks management systems, so as to realize
   the end-to-end service provision.


      |                 End-to-End Connection                    |
      |<-------------------------------------------------------->|
      |                                                          |
         +--------+  +-------+  +-------+  +-------+  +-------+
         | Access |  | Metro |  | Core  |  | Metro |  | Access|



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Internet-Draft      PTN requirements in ACTN architecture      July 2014
   +--+  | PTN    |  | PTN   |  | PTN   |  | PTN   |  | PTN   |  +--+
   |CE|==|(Vender |==|(Vender|==|(Vender|==|(Vender|==|(Vender|==|CE|
   +--+  |    A)  |  |   B)  |  |   C)  |  |    D) |  |    E) |  +--+
         +--------+  +-------+  +-------+  +-------+  +-------+

         Figure 1 End-to-End Connection in Mobile Backhaul Networks

2.2. Multi-layer coordination Requirement in L2/L3 Packet Transport
    Networks

   LTE backhauling requires the PTN to realize L3 network function.
   This function requires the management systems operate in different
   layers of networks, and leads to separate and fragmented network
   configuration. Further, the L2 PTN and L3 PTN networks may be
   provided by different venders, and make the end-to-end provisioning
   much more complex. In the ACTN architecture, new functions such as
   topology detection and virtualization, auto-routing calculation are
   introduced. With these functions, operator can improve the user
   experiences and lower the OPEX.

   On the other hand, operators want to obtain the flow information and
   realize the load balancing within L3 PTN networks,


                   |       End-to-End Connection     |
                   |<------------------------------->|
                   |                                 |
                       +----------+   +----------+
          +--------+   |          |   |          |   +--------+
          | Radio  |   | Layer 2  |   | Layer 3  |   | Radio  |
          | Access |===|   PTN    |===|   PTN    |===| Core   |
          |Networks|   | Networks |   | Networks |   |Networks|
          +--------+   |(Vender A)|   |(Vender B)|   +--------+
                       |          |   |          |
                       +----------+   +----------+

            Figure 2 End-to-End Connection for L2&L3 PTN Networks

2.3.   Optimizing the network resources utilization

   The packet transport networks can support various performances
   monitoring matrix, such as traffic flow statistics, packet delay,
   delay variation, throughput and packet-loss rate, etc. All these
   performance parameters can support the enterprise customers SLA
   requirements. Through the performance monitoring, the PTN can



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   realize the service SLA optimization and network traffic
   optimization. See [ACTN-PERF] for related discussion.

3. Virtual Networks Operations for Packet Transport Networks

   Figure 3 shows an example of virtual network operations for packet
   transport networks. In order to realize end-to-end service provision,
   the ACTN architecture [ACTN-FWK] should consider coordination with
   traditional network management systems. By the network
   virtualization and abstraction, the traditional networks can be
   considered as a virtual network for VNC service provider, which can
   be realized by network management systems providing an abstract
   agent for VNC, or the VNC providing traditional interface for NMS.


             +-----------------------------------------+
             |             VNC Service Provider        |
             +-----------------------------------------+
                  /                |               \
                 /                 |                \
                /                  |                 \
               /   +-----------------------------+    \
              /    |       NMS Abstract Agent    |     \
         +-------+ +-----------------------------+ +-------+
         |Access | +-----------------------------+ |Access |
         |Control| | Network Management Systems  | |Control|
         +-------+ +-----------------------------+ +-------+
              |         |          |          |          |
              |         |          |          |          |
              |         |          |          |          |
         +-------+  +-------+  +-------+  +-------+  +-------+
         | Access|  | Metro |  | Core  |  | Metro |  | Access|
   +--+  | PTN   |  | PTN   |  | PTN   |  | PTN   |  | PTN   |  +--+
   |CE|==|(Vender|==|(Vender|==|(Vender|==|(Vender|==|(Vender|==|CE|
   +--+  |    A) |  |    B) |  |    C) |  |    D) |  |    E) |  +--+
         +-------+  +-------+  +-------+  +-------+  +-------+

        Figure 3 End-to-End Connection in Mobile Backhaul Networks



4. Security Considerations

   This document raises no new security issues.




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5. IANA Considerations

   No new IANA considerations are raised by this document.

6. References

6.1.   Informative References

   [ACTN-FWK]   Daniele C., Luyuan Fang, Yong Lee and Diego Lopez,
                "Framework for Abstraction and Control of Transport
                Networks", draft-ceccarelli-actn-framework-02.

   [ACTN-PERF] Yunbin Xu, Weiqiang Cheng, Guoying Zhang and Haomian
             Zheng, "Use Cases and Requirements of Dynamic Service
             Control based on Performance Monitoring in ACTN
             Architecture", draft-xu-actn-perf-dynamic-service-control-
             01.



Authors's Address

   Weiqiang Cheng
   China Mobile Communication Company
   No.32 Xuanwumen West Street, Xicheng District, Beijing, China
   Email:chengweiqiang@chinamobile.com
   Yunbin Xu
   China Academy of Telecom Research
   NO.52 Huayuan Beilu, Haidian District, Beijing, China
   Email: xuyunbin@catr.cn
   Guoying Zhang
   China Academy of Telecom Research
   NO.52 Huayuan Beilu, Haidian District, Beijing, China
   Email: zhangguoying@catr.cn




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