ETSI TR 136 927-2018 LTE Evolved Universal Terrestrial Radio Access (E-UTRA) Potential solutions for energy saving for E-UTRAN (V15 0 0 3GPP TR 36 927 version 15 0 0 Release 15).pdf

1、 ETSI TR 136 927 V15.0.0 (2018-07) LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Potential solutions for energy saving for E-UTRAN (3GPP TR 36.927 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 136 927 V15.0.0 (2018-07)13GPP TR 36.927 version 15.0.0 Release 15Reference RTR/TSGR

2、-0336927vf00 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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13、resent document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or r

14、eports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs termi

15、nology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described 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 exc

16、ept when used in direct citation. ETSI ETSI TR 136 927 V15.0.0 (2018-07)33GPP TR 36.927 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 5g31 Scope 6g32 References 7g33 Definitions, symbols and abbreviations . 8g33.

17、1 Definitions 8g33.2 Symbols 8g33.3 Abbreviations . 8g34 General . 9g35 Inter-RAT energy saving 10g35.1 Study on inter-RAT scenario 1 . 10g35.1.1 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 10g

18、35.1.2.2 Signalling based solution for E-UTRAN cell entering or waking up from dormant mode . 11g35.1.2.3 How to exit dormant mode efficiently? . 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 o

19、f 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 14g36.1.3 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 proc

20、edures . 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-UTRAN 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 c

21、hange control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 136 927 V15.0.0 (2018-07)53GPP TR 36.927 version 15

22、.0.0 Release 15Introduction At present, sustainable development is a long-term commitment for all people in the world. This means not only development but also innovation. People should do their best to handle the resource shortage and environment deterioration. Therefore, how to improve the power e

23、fficiency and realize the power saving becomes a significant issue. In the telecom area, most mobile network operators aim at decreasing the power 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

24、 power efficiency in the infrastructure and terminal becomes an essential part of the cost-related requirements in network, and there is a strong need to investigate possible network energy saving solutions. ETSI ETSI TR 136 927 V15.0.0 (2018-07)63GPP TR 36.927 version 15.0.0 Release 151 Scope The p

25、resent document is the technical report for the study item on Network Energy Saving for E-UTRAN, which was approved at TSG RAN#47. The objective 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, in

26、itial evaluation should be performed for each solution. ETSI ETSI TR 136 927 V15.0.0 (2018-07)73GPP TR 36.927 version 15.0.0 Release 152 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either

27、 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

28、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: “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 3

29、6.300: “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2“. 5 3GPP TS 36.331: “E-UTRA; RRC; Protocol specification Release 10“. ETSI ETSI TR 136 927 V15.0.0 (2018-07)83GPP TR 36.927 version 15.0.0 Release 153 De

30、finitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 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 1. 3.2 Symbols For

31、 the purposes of the present document, the following symbols apply: 3.3 Abbreviations For the purposes of the present document, the abbreviations 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 abbreviatio

32、n, 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 For Further Specification IoT Interference over Thermal LTE Long Term Evolution OAM Operations, Administration, Maintenance OPEX Operating Expenses RAN Radio

33、 Access Network SON Self-Organizing Networks TRX Transceiver UMTS Universal Mobile Telecommunications System UTRAN Universal Terrestrial Radio Access Network ETSI ETSI TR 136 927 V15.0.0 (2018-07)93GPP TR 36.927 version 15.0.0 Release 154 General The objective of this study item is to identify poten

34、tial 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 the 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

35、energy saving - Inter-eNB energy saving - Inter-RAT energy saving Energy saving solutions identified in this study item should be justified by valid scenario(s), and based on cell/network load situation. Impacts on legacy and new terminals when introducing an energy saving solution should be careful

36、ly considered. The scope of the study item shall be as follows: - User accessibility should be guaranteed when a cell transfers to energy saving mode - Backward compatibility and the ability to provide energy saving for Rel-10 network deployment that serves a number of legacy UEs - Solutions shall n

37、ot impact the Uu physical layer - The solutions should not impact negatively the UE power consumption Note that energy saving for HeNB is out of the scope of this study item. ETSI ETSI TR 136 927 V15.0.0 (2018-07)103GPP TR 36.927 version 15.0.0 Release 155 Inter-RAT energy saving 5.1 Study on inter-

38、RAT scenario 1 5.1.1 Description of scenario 1 Networks may consist of LTE cells deployed as capacity enhancement, overlaying existing and optimized 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 co

39、vered 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, 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 L

40、TE coverage could not be guaranteed. The legacy network provides the basic coverage, for UEs with multi-mode capability. The energy saving solutions 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 wh

41、ether service for LTE-only capable devices needs to be maintained. If all cells have the same multiple PLMNs in a network sharing scenario, there 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 Ener

42、gy saving procedures To achieve energy savings in this inter-RAT energy savings scenario, two fundamental approaches, which differ in how capacity-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 Furthermo

43、re, 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 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 s

44、ubset of following principles: - E-UTRAN cells enters or leaves dormant mode based on centralized OAM decisions, which are made based on statistical 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

45、 directly signalled to the EUTRAN cells. - If an E-UTRAN cell enters or leaves dormant mode, its intra/inter-RAT neighbour nodes should be informed either via OAM or signalling. ETSI ETSI TR 136 927 V15.0.0 (2018-07)113GPP TR 36.927 version 15.0.0 Release 155.1.2.2 Signalling based solution for E-UT

46、RAN 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 may decide to enter dormant mode autonomously or based on information exchanging with the UTRAN/GERAN coverage cell. - Switch off decisions/requests will be

47、 based on information locally available in the EUTRAN node, including load information of both the coverage and E-UTRAN cells. - Switch-on may 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 ti

48、me, etc,). - Intra-RAT and Inter-RAT neighbour nodes should be informed after on/off decision is made. - To perform energy saving more efficiently, some energy saving parameters may be exchanged between inter-RAT neighbour cells if required, e.g. traffic thresholds, time duration, power consumption

49、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 increases 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 by the E-UTRAN cell based on information locally available. Some possible enhancements to optimize switch on decisions