cats                                                             J. Wang
Internet-Draft                                              China Mobile
Intended status: Informational                           21 October 2024
Expires: 24 April 2025


         A Use case for Green Computing-Aware Traffic Steering
                    draft-wang-cats-usecase-green-00

Abstract

   This draft describes a compute-aware use case for services with green
   energy requirements.  This use case considers both network,
   computation and energy metrics when selecting a service instance.

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   This Internet-Draft will expire on 24 April 2025.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definition of Terms . . . . . . . . . . . . . . . . . . . . .   2
   3.  Use Case  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Distributed Model . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Centralized Model . . . . . . . . . . . . . . . . . . . .   4
   4.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Informative References  . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   As mobile edge computing networks sink computational tasks from cloud
   data centers to the edge of the network, tasks need to be processed
   by computational resources close to the user's end as mentioned in
   [I-D.ietf-cats-usecases-requirements].  Therefore, CATS is proposed.
   Reducing carbon emissions is a major challenge that needs to be faced
   in our time.  The network is the main enabler to achieve the
   reduction of carbon emission.The introduction of computational
   dimension in CATS makes the previous energy saving by considering
   only the network dimension to be insufficient and hence green for
   CATS based on the association of network and computation is worth to
   be explored.

   Recently, the GREEN WG was formed.  It is chartered to explore use
   cases, derive requirements, and provide solutions for identifying and
   characterizing energy efficiency metrics, methods related to energy
   consumption of network devices, and optimizing energy efficiency
   across the network. network.  There are also a number of
   contributions that explore green networks, and the document
   [I-D.wang-cats-green-challenges] summarizes a number of challenges
   faced by cats considering green.

   This document provides a green cats use case.

2.  Definition of Terms

   Computing-Aware Traffic Steering (CATS):  Aiming at computing and
     network resource optimization by steering traffic to appropriate
     computing resources considering not only routing metric but also
     computing resource metric.

   Service:  A monolithic functionality that is provided by an endpoint
     according to the specification for said service.  A composite
     service can be built by orchestrating monolithic services.



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   Service instance:  Running environment (e.g., a node) that makes the
     functionality of a service available.  One service can have several
     instances running at different network locations.

3.  Use Case

   Geared towards green computing-aware traffics Steering, the green
   metrics include the energy consumption of network devices as well as
   the energy consumption of computing resources.  The following
   describes how green metrics are distributed under both distributed
   and centralized models.

3.1.  Distributed Model

   Figure 1 shows an example of how Green CATS metrics can be
   disseminated in the distributed model.  In this way, green metrics
   are distributed among network devices directly using distributed
   protocols without interactions with a centralized control plane.

































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          Service CS-ID 1, contact instance CSCI-ID 1 <computing metrics, green metrics>
          Service CS-ID 1, contact instance CSCI-ID 2 <computing metrics, green metrics>

                 :<----------------------:
                 :                       :               +---------+
                 :                       :               |CS-ID 1  |
                 :                       :            +--|CSCI-ID 1|
                 :              +----------------+    |  +---------+
                 :              |    C-SMA       |----|   Service Site 2
                 :              +----------------+    |  +---------+
                 :              |CATS-Forwarder 2|    +--|CS-ID 1  |
                 :              +----------------+       |CSCI-ID 2|
 +--------+      :                        |              +---------+
 | Client |      :  Network +----------------------+
 +--------+      :  metrics | +-------+            |
      |          : :<---------| C-NMA |            |
      |          :  Green   | +-------+            |
      |          :  metrics |                      |
 +---------------------+    |                      |
 |CATS-Forwarder 1|C-PS|----|                      |
 +---------------------+    |       Underlay       |
                 :          |     Infrastructure   |     +---------+
                 :          |                      |     |CS-ID 1  |
                 :          +----------------------+ +---|CSCI-ID 3|
                 :                    |              |   +---------+
                 :          +----------------+  +-------+
                 :          |CATS-Forwarder 3|--| C-SMA | Service Site 3
                 :          +----------------+  +-------+
                 :                                :  |   +-------+
                 :                                :  +---|CS-ID 2|
                 :                                :      +-------+
                 :<-------------------------------:
          Service CS-ID 1, contact instance CSCI-ID 3 <computing metrics, green metrics>
          Service CS-ID 2, <computing metrics, green metrics>

     Figure 1: An Example of Green CATS Metric Dessimination in a
                          Distributed Model

3.2.  Centralized Model

   In Figure 2, network metrics, computing metrics, and green metrics
   can be distributed in a centralized way.  Green metrics are collected
   by the centralized control plane, and then the centralized control
   plane calculates the forwarding path corresponding to the energy
   efficiency demand request and synchronizes with the Ingress CATS-
   Forwarder.





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                        Service CS-ID 1, instance CSCI-ID 1 <computing metrics, green metrics>
                        Service CS-ID 1, instance CSCI-ID 2 <computing metrics, green metrics>
                        Service CS-ID 1, instance CSCI-ID 3 <computing metrics, green metrics>
                        Service CS-ID 2, <metrics>

             :       +------+
             :<------| C-PS |<-----------------------------------+
             :       +------+ <------+              +---------+  |
             :          ^            |           +--|CS-ID 1  |  |
             :          |            |           |  |CSCI-ID 1|  |
             :          |   +----------------+   |  +---------+  |
             :          |   |    C-SMA       |---|Service Site 2 |
             :          |   +----------------+   |  +---------+  |
             :          |   |CATS-Forwarder 2|   +--|CS-ID 1  |  |
             :          |   +----------------+      |CSCI-ID 2|  |
 +--------+  :          |             |             +---------+  |
 | Client |  :  Network |   +----------------------+             |
 +--------+  :  metrics |   | +-------+            |             |
      |      :          +-----| C-NMA |            |      +-----+
      |      :  Green   |   | +-------+            |      |C-SMA|<-+
      |         metrics |   |                      |      +-----+  |
 +----------------+ <---+   |                      |               |
 |CATS-Forwarder 1|---------|                      |          ^    |
 +----------------+         |       Underlay       |          |    |
             :              |     Infrastructure   |    +---------+|
             :              |                      |    |CS-ID 1  ||
             :              +----------------------+  +-|CSCI-ID 3||
             :                        |               | +---------+|
             :          +----------------+------------+            |
             :          |CATS-Forwarder 3|         Service Site 3  |
             :          +----------------+                         |
             :                        |       :      +-------+     |
             :                        +-------:------|CS-ID 2|-----+
             :                                :      +-------+
             :<-------------------------------:
      Service CS-ID 1, contact instance CSCI-ID 3
      Service CS-ID 2

     Figure 2: An Example of Green CATS Metric Distribution in a
                          Centralized Model

4.  Conclusion

   This document gives a CATS use case related to green and further
   describes how green metrics can be distributed under both distributed
   and centralized models.





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5.  Security Considerations

   TBD.

6.  IANA Considerations

   TBD.

7.  Informative References

   [I-D.ietf-cats-usecases-requirements]
              Yao, K., Contreras, L. M., Shi, H., Zhang, S., and Q. An,
              "Computing-Aware Traffic Steering (CATS) Problem
              Statement, Use Cases, and Requirements", Work in Progress,
              Internet-Draft, draft-ietf-cats-usecases-requirements-04,
              3 July 2024,
              <https://datatracker.ietf.org/api/v1/doc/document/draft-
              ietf-cats-usecases-requirements/>.

   [I-D.wang-cats-green-challenges]
              Wang, J., Fu, Y., and C. Li, "Green Challenges in
              Computing-Aware Traffic Steering (CATS)", Work in
              Progress, Internet-Draft, draft-wang-cats-green-
              challenges-04, 7 July 2024,
              <https://datatracker.ietf.org/doc/html/draft-wang-cats-
              green-challenges-04>.

Author's Address

   Jing Wang
   China Mobile
   No.32 XuanWuMen West Street
   Beijing
   100053
   China
   Email: wangjingjc@chinamobile.com















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