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Content for  TR 23.866  Word version:  12.0.0

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1  ScopeWord‑p. 5

The present document is for investigating deployment aspects that relate to energy efficiency, including potential system enhancements that support energy efficient deployments. System enhancements may be anticipated in the area of functions that have major influence on deployment like functions that support pools of CN nodes or functions that enable multiple CN nodes to serve the same or overlapping areas. The initial focus is on PS domain. This study should avoid any overlap with the work by RAN/CT/SA5 by taking into account the work that has been and is going on in these WGs. Proposals have to be well justified to be considered in this document.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.401: "GPRS enhancements for E-UTRAN access".

3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Energy conservation mode (for load re-distribution):
an operational state, subject to implementation, of an EPC node with reduced capacity (e.g. in terms of number of users to be handled) or performance (e.g. in terms of data rate for user plane handling), requiring less power than in normal operational state. Subject to implementation, a node in energy conservation mode may reduce its capacity/performance to zero.
Suspension mode (for load re-distribution):
an operational state of an EPC node where load needs to be reduced (by re-distribution to alternative nodes). While in suspension mode, this node will not be selected to handle further users. In the context of this technical report, suspension mode is used to enable load redistribution for energy saving reasons.

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 apply.

4  Approaches for Energy Efficient DeploymentsWord‑p. 6

This clause describes high level approaches that enable or support energy efficient deployments. The energy efficient deployment scenarios that are described and evaluated later in this document are assumed to base on one or more of the mechanisms provided by the system architecture, which are:
  • Separation of control and user plane allowing for independent scaling and deployment of related network entities and deployment at different locations, e.g. allowing for operating control functionality at locations with more energy efficient conditions, which could be locations with lower cooling requirements or where functionality can be shared with other applications or can be hosted in a more energy efficient way.
  • Aggregation or pooling of network entities, allowing for higher multiplexing gains or economies of scale not only for PLMN specific functionality, but also for example for power supply or air conditioning. It can also reduce the amount of deployed spare capacity that is used, for example, to cope with load changes or for reliability reasons.
  • Load balancing/(re)distribution approaches; allowing network nodes to operate at an energy efficient load status, or for offloading nodes followed by a change to some energy saving mode.
Further, it is assumed that energy efficient deployments shall have minimum impact on user experience.

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