1、 ETSI TR 136 927 V14.0.0 (2017-04) LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Potential solutions for energy saving for E-UTRAN (3GPP TR 36.927 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 136 927 V14.0.0 (2017-04)13GPP TR 36.927 version 14.0.0 Release 14Reference RTR/TSGR
2、-0336927ve00 Keywords LTE ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document
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8、s Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 136 927 V14.0.0
9、(2017-04)23GPP TR 36.927 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can b
10、e found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI I
11、PR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword Th
12、is Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETS
13、I deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as descr
14、ibed in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 136 927 V14.0.0 (2017-04)33GPP TR 36.927 version 14.0.0 Release 14Contents Intellectual Property
15、 Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 5g31 Scope 6g32 References 7g33 Definitions, symbols and abbreviations . 8g33.1 Definitions 8g33.2 Symbols 8g33.3 Abbreviations . 8g34 General . 9g35 Inter-RAT energy saving 10g35.1 Study on inter-RAT scenario 1 . 10g35.1
16、.1 Description of scenario 1 10g35.1.2 Energy saving procedures . 10g35.1.2.1 OAM-based solution for E-UTRAN cell entering or waking up from dormant mode 10g35.1.2.2 Signalling based solution for E-UTRAN cell entering or waking up from dormant mode . 11g35.1.2.3 How to exit dormant mode efficiently?
17、 . 11g35.1.3 Evaluations and comparisons 12g35.1.4 Conclusions. 13g36 Inter-eNB energy saving 14g36.1 Study on inter-eNB scenario 1 . 14g36.1.1 Description of scenario 1 14g36.1.2 Energy Saving Procedures 14g36.1.2.1 Baseline Rel-9 mechanisms 14g36.1.2.2 How to exit dormant mode efficiently 14g36.1.
18、3 Evaluations and comparisons 15g36.1.4 Conclusions. 16g36.2 Study on inter-eNB scenario 2 . 17g36.2.1 Description of scenario 2 17g36.2.2 Energy saving procedures . 17g36.2.2.1 OAM-based solution for E-UTRAN cell entering or waking up from dormant mode 17g36.2.2.2 Signalling based solution for E-UT
19、RAN cell entering or waking up from dormant mode . 18g36.2.2.3 Hybrid O 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the th
20、ird digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 136 927 V14.0.0 (2017-04)53GPP TR 36.927 version 14.0.0 Release 14Introduction At present, sustainable development is a long-term commitment for all people in the world. This means not only deve
21、lopment but also innovation. People should do their best to handle the resource shortage and environment deterioration. Therefore, how to improve the power efficiency and realize the power saving becomes a significant issue. In the telecom area, most mobile network operators aim at decreasing the po
22、wer consumption without too much impact on their network. In this case, the greenhouse emissions are reduced, while the OPEX of operators is saved. Thus, the power efficiency in the infrastructure and terminal becomes an essential part of the cost-related requirements in network, and there is a stro
23、ng need to investigate possible network energy saving solutions. ETSI ETSI TR 136 927 V14.0.0 (2017-04)63GPP TR 36.927 version 14.0.0 Release 141 Scope The present document is the technical report for the study item on Network Energy Saving for E-UTRAN, which was approved at TSG RAN#47. The objectiv
24、e of the SI is to first identify the relevant scenarios and then study and present the solutions that are applicable to EUTRAN energy saving. Furthermore, initial evaluation should be performed for each solution. ETSI ETSI TR 136 927 V14.0.0 (2017-04)73GPP TR 36.927 version 14.0.0 Release 142 Refere
25、nces 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 rev
26、isions 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. 1 3GPP TR 21.905:
27、“Vocabulary for 3GPP Specifications“. 2 RP-100674: “Network Energy Saving for E-UTRAN “, CMCC. 3 3GPP TS 36.214: “Physical layer; Measurements “. 4 3GPP TS 36.300: “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stag
28、e 2“. 5 3GPP TS 36.331: “E-UTRA; RRC; Protocol specification Release 10“. ETSI ETSI TR 136 927 V14.0.0 (2017-04)83GPP TR 36.927 version 14.0.0 Release 143 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 a
29、nd 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 1. 3.2 Symbols For the purposes of the present document, the following symbols apply: 3.3 Abbreviations For the purposes of the present document, the abbreviatio
30、ns given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. eNB enhanced NodeB EPC Evolved Packet Core E-UTRAN Evolved UTRAN ES Energy SavingsESM Energy Savings Management FFS
31、For Further Specification IoT Interference over Thermal LTE Long Term Evolution OAM Operations, Administration, Maintenance OPEX Operating Expenses RAN Radio Access Network SON Self-Organizing Networks TRX Transceiver UMTS Universal Mobile Telecommunications System UTRAN Universal Terrestrial Radio
32、Access Network ETSI ETSI TR 136 927 V14.0.0 (2017-04)93GPP TR 36.927 version 14.0.0 Release 144 General The objective of this study item is to identify potential solutions for energy saving in E-UTRAN and perform initial evaluation of the proposed solutions, so that a subset of them can be used as t
33、he basis for further investigation and standardization. The following use cases will be considered in this study item as defined in RP-100674 2: - Intra-eNB energy saving - Inter-eNB energy saving - Inter-RAT energy saving Energy saving solutions identified in this study item should be justified by
34、valid scenario(s), and based on cell/network load situation. Impacts on legacy and new terminals when introducing an energy saving solution should be carefully considered. The scope of the study item shall be as follows: - User accessibility should be guaranteed when a cell transfers to energy savin
35、g mode - Backward compatibility and the ability to provide energy saving for Rel-10 network deployment that serves a number of legacy UEs - Solutions shall not impact the Uu physical layer - The solutions should not impact negatively the UE power consumption Note that energy saving for HeNB is out o
36、f the scope of this study item. ETSI ETSI TR 136 927 V14.0.0 (2017-04)103GPP TR 36.927 version 14.0.0 Release 145 Inter-RAT energy saving 5.1 Study on inter-RAT scenario 1 5.1.1 Description of scenario 1 Networks may consist of LTE cells deployed as capacity enhancement, overlaying existing and opti
37、mized 2G/3G network. Figure 5.1.1-1. Inter-RAT energy saving scenario 1 Figure 5.1.1.1 shows scenario 1 in which E-UTRAN Cell C, D, E, F and G are totally covered by the same legacy RAT Cell A and B (e.g. UMTS or GSM). Cell A/B has been deployed to provide basic coverage of the services in the area,
38、 while other E-UTRAN cells boost the capacity. The E-UTRAN cells are only deployed for capacity enhancement at some hot spots, therefore, the continuity of LTE coverage could not be guaranteed. The legacy network provides the basic coverage, for UEs with multi-mode capability. The energy saving solu
39、tions for this scenario should only be considered in case the E-UTRAN is jointly deployed with legacy RAT (e.g. UMTS or GSM). It is up to operators policy whether service for LTE-only capable devices needs to be maintained. If all cells have the same multiple PLMNs in a network sharing scenario, the
40、re are no issues with the solutions to scenario 1. Limitations related to other network sharing scenarios are not included within this Study Item. 5.1.2 Energy saving procedures To achieve energy savings in this inter-RAT energy savings scenario, two fundamental approaches, which differ in how capac
41、ity-booster E-UTRAN cells enter or wake up from dormant mode, can be used. These approaches are: 1. OAM-based approach 2. Signalling-based approach Furthermore, the energy saving policy may prefer not to switch off the E-UTRAN cells that are in an overlapping area between two or more basic coverage
42、cells (handover region). 5.1.2.1 OAM-based solution for E-UTRAN cell entering or waking up from dormant mode The approach is based on the complete set or a subset of following principles: - E-UTRAN cells enters or leaves dormant mode based on centralized OAM decisions, which are made based on statis
43、tical information obtained from coverage and/or GERAN/UTRAN/E-UTRAN cells, e.g. load information, traffic QCI, etc The OAM decisions can be pre-configured or directly signalled to the EUTRAN cells. ETSI ETSI TR 136 927 V14.0.0 (2017-04)113GPP TR 36.927 version 14.0.0 Release 14- If an E-UTRAN cell e
44、nters or leaves dormant mode, its intra/inter-RAT neighbour nodes should be informed either via OAM or signalling. 5.1.2.2 Signalling based solution for E-UTRAN cell entering or waking up from dormant mode The approach is based on the complete set or a subset of following principles: - E-UTRAN cells
45、 may decide to enter dormant mode autonomously or based on information exchanging with the UTRAN/GERAN coverage cell. - Switch off decisions/requests will be based on information locally available in the EUTRAN node, including load information of both the coverage and E-UTRAN cells. - Switch-on may
46、be performed based upon requests from one or more neighbour inter-RAT nodes, or based on internal EUTRAN node policies (periodic switch on, max switch off time, etc,). - Intra-RAT and Inter-RAT neighbour nodes should be informed after on/off decision is made. - To perform energy saving more efficien
47、tly, some energy saving parameters may be exchanged between inter-RAT neighbour cells if required, e.g. traffic thresholds, time duration, power consumption and so on. 5.1.2.3 How to exit dormant mode efficiently? Solution A: No assistance When some E-UTRAN cells are in dormant mode and the load inc
48、reases on the UTRAN/GERAN coverage cells, the UTRAN/GERAN coverage cells may not know the most appropriate E-UTRAN cells to wake-up. The overloaded coverage cells may request wake-up of one or more of the neighbouring dormant E-UTRAN cells. The final decision to leave dormant mode is however taken b
49、y the E-UTRAN cell based on information locally available. Some possible enhancements to optimize switch on decisions are reported below, whereby the actual “switch on” decision algorithm implementation could be based on one or several of these enhancements: Solution B: OAM predefined low-load periods policies When the coverage UTRAN/GERAN cell detects high load, it uses a proprietary algorithm to decide which E-UTRAN cells should be activated. The algorithm could rely on pre-defined low-load periods policies for each neighbour E-UTRAN cell. The low
