1、 ETSI TR 145 926 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Solutions for GSM/EDGE Base Transceiver Station (BTS) energy saving (3GPP TR 45.926 version 15.0.0 Release 15) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 145 926 V15.0.0 (2018-0
2、7)13GPP TR 45.926 version 15.0.0 Release 15Reference RTR/TSGR-0645926vf00 Keywords GSM 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
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9、145 926 V15.0.0 (2018-07)23GPP TR 45.926 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETS
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13、demark and/or tradename. Mention of those trademarks in the present 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). Th
14、e 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 ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found und
15、er 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 described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “
16、must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 145 926 V15.0.0 (2018-07)33GPP TR 45.926 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 R
17、eferences 6g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Symbols 7g33.3 Abbreviations . 7g34 Study Considerations 8g34.0 General . 8g34.1 Network Scenario Considerations 8g34.2 Energy Consumption of BTS . 8g35 Objectives . 9g35.1 Performance Objectives: energy efficiency tar
18、get 9g35.2 Compatibility Objectives 9g35.2.1 Avoid impact to voice user call quality 9g35.2.2 Avoid impact to data user session quality . 9g35.2.3 Avoid impact to cell (re)selection and handover 9g35.2.4 Support of legacy MSs 9g35.2.5 Implementation impacts to new MSs 9g35.2.6 Implementation impacts
19、 to BSS 9g35.2.7 Impacts to network planning . 9g36 Common Assumptions . 10g36.1 Reference Configuration 10g36.2 Evaluation Metrics . 11g36.3 Traffic Load profiles 11g36.4 Reference deployment scenarios 11g36.5 MS characteristics 15g36.5.1 BCCH carrier power measurement sampling . 15g36.5.1.1 Idle m
20、ode 15g36.5.1.2 Connected mode 17g36.5.2 BCCH carrier power measurement accuracy 17g36.5.3 BCCH carrier power measurement averaging 17g36.5.4 BSIC Decoding . 17g36.5.5 Power reduction on TS preceding BCCH timeslot . 18g36.5.6 Handover, Cell Selection and Cell Reselection 18g36.5.7 Mobile velocity .
21、18g36.5.8 Mobile station types 18g36.6 BTS characteristics . 18g36.6.1 Network synchronization 18g36.6.2 Modelling of TRX power consumption 18g37 Candidate Solution: BCCH Carrier Power Reduction Methodology . 19g37.1 Introduction 19g37.2 Methodology 19g37.2.1 Variant 1 . 19g37.2.2 Variant 2 . 20g37.
22、3 Evaluation. 20g37.3.1 Simulation Assumptions . 21g37.3.2 Evaluations . 22g3ETSI ETSI TR 145 926 V15.0.0 (2018-07)43GPP TR 45.926 version 15.0.0 Release 157.3.2.1 Impacts to Radiated Power and Power Consumption . 22g37.3.2.2 Impacts to Call Quality . 23g37.3.2.3 Impacts to Handover . 24g37.4 Conclu
23、sion 25g38 Candidate Solution: Output Power Reduction on BCCH Carrier for GMSK 26g38.1 Introduction 26g38.2 Concept Description . 26g38.2.1 Overview 26g38.2.2 Exemplary Scenario 26g38.3 Concept Evaluation 27g38.3.0 Overview 27g38.3.1 Simulation Model . 27g38.3.1.1 Simulation Assumptions . 27g38.3.1.
24、2 Channel Allocation Strategies . 31g38.3.1.3 Deployment Scenarios and Network Layout . 31g38.3.1.4 Output Power Reduction Settings on BCCH carrier . 32g38.3.1.5 Employed Link-to-System Mapping . 33g38.3.2 Simulation Results 33g38.3.2.1 Scenario S1 . 33g38.3.2.2 Scenario S2 . 34g38.3.2.3 Scenario S3
25、 . 35g38.3.2.4 Scenario S4 . 35g38.3.2.5 Scenario M1 36g38.3.2.6 Scenario M2 37g38.3.2.7 Impact on performance of neighbour cell identification in connected mode 38g38.3.2.8 Impact on performance of neighbour cell identification in idle mode 39g38.3.2.9 Results for the alternative MS velocity . 41g3
26、8.3.2.9.1 Scenario S5 41g38.3.2.9.2 Scenario S6 42g38.3.2.9.3 Impact on performance of neighbour cell identification in connected mode . 43g38.3.2.9.4 Impact on performance of neighbour cell identification in idle mode . 43g38.3.3 Impact to Specifications 44g38.3.3.2.1 Example implementation of opti
27、on 2 in the specifications 47g38.3.3.3.1 Example implementation of option 3 in the specifications 50g310.5.2.11 Control Channel Description . 50g38.4 Conclusion 53g39 Summary and Conclusions . 54g3Annex A: Bibliography 56g3Annex B: Change history 57g3History 58g3ETSI ETSI TR 145 926 V15.0.0 (2018-07
28、)53GPP TR 45.926 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the conte
29、nts of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved doc
30、ument under change 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. Introduction Energy saving is important for operato
31、rs operational efficiency. Energy consumption is a significant operational cost factor, for example in developing markets, up to 30% of OPEX is spent on energy. For one operator group, almost 80% of base stations in Africa and India use diesel as the primary or as a backup power source. Furthermore,
32、 base stations account up to 80% of the total CO2emissions in a mobile operator network. Many operators have a target to cut CO2emissions as part of their environmental objectives. With increasing voice usage, data usage (e.g. introduction of smart phones, MTC devices, etc.) and more dense networks,
33、 the thirst for energy consumption is expected to increase further, hence, motivating the need for low energy base station technology. Increasing the energy efficiency of base stations or reducing the energy consumption of base stations will also facilitate the possibility for operators to power all
34、 types of base stations with alternative fuels and rely less on fossil fuels either from diesel generators or from the electricity grid. ETSI ETSI TR 145 926 V15.0.0 (2018-07)63GPP TR 45.926 version 15.0.0 Release 151 Scope The present document provides a study into BTS energy saving solutions. The
35、present document analyses and evaluates different solutions to determine the benefits provided compared to the legacy BTS energy consumption. In the scope of this study there are following solutions: - Reduction of Power on the BCCH carrier (potentially enabling dynamic adjustment of BCCH power) - R
36、eduction of power on DL common control channels - Reduction of power on DL channels in dedicated mode, DTM and packet transfer mode - Deactivation of cells (e.g. Cell Power Down and Cell DTX like concepts as discussed in RAN 4) - Deactivation of other RATs in areas with multi-RAT deployments, for ex
37、ample, where the mobile station could assist the network to suspend/minimize specific in-use RATs at specific times of day - And any other radio interface impacted power reduction solutions The solutions will also consider the following aspects: - Impacts on the time for legacy and new mobile statio
38、ns to gain access to service from the BTS - Impacts on legacy and new mobile stations to keep the ongoing service (without increasing drop rate) - Impacts on legacy and new mobile stations implementation and power consumption, e.g. due to reduction in DL power, cell (re-)selection performance, hando
39、ver performance, etc. - Impacts on UL/DL coverage balance, especially to CS voice Solutions will be considered for both BTS energy saving non-supporting and supporting mobile stations (i.e. solutions that are non-backwards compatible towards legacy mobile stations will be out of the scope of this st
40、udy). The contents of the present document when stable will determine the modifications to existing GERAN specifications. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (id
41、entified 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
42、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 3GPP TR 41.001: “GSM Release specifications“. 3 ETSI TS 102 706: “Energy Efficiency of Wireless Access Network Equipment“. 4 3GPP
43、TR 25.927: “Solutions for Energy Savings within UTRA NodeB“, V.10.0.0 5 3GPP TS 45.002: “Multiplexing and multiple access on the radio path“. 6 3GPP TS 45.008: “Radio subsystem link control“. 7 3GPP TR 45.913: “Optimized transmit pulse shape for downlink Enhanced General Packet Radio Service (EGPRS2
44、-B)“. ETSI ETSI TR 145 926 V15.0.0 (2018-07)73GPP TR 45.926 version 15.0.0 Release 158 3GPP TR 45.050: “Background for Radio Frequency (RF) requirements“. 9 3GPP TR 45.914: “Circuit switched voice capacity evolution for GSM/EDGE Radio Access Network (GERAN)“. 10 3GPP TS 24.008: “Mobile radio interfa
45、ce Layer 3 specification; Core network protocols; Stage 3“. 11 3GPP TR 45.912: “Feasibility study for evolved GSM/EDGE Radio Access Network (GERAN)“. 12 3GPP TS 44.018: “Mobile radio interface layer 3 specification; Radio Resource Control (RRC) protocol“. 3 Definitions, symbols and abbreviations 3.1
46、 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. busy hour: one hour period during which occurs the maxi
47、mum total load in a given 24-hour period busy hour load: average BTS load during busy hour energy efficiency: relation between the useful output and energy/power consumption low load: average BTS load during time when there is only very low traffic in network medium term load: defined BTS load level
48、 between busy hour and low load levels 3.2 Symbols Void. 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 abbreviation, if any,
49、in TR 21.905 1. AFS Adaptive multirate Fullrate Speech AHS Adaptive multirate Halfrate Speech APD Average Power Decrease BBU Base Band Unit BHT Busy Hour Traffic BTS Base Transceiver Station DARP Downlink Advanced Receiver Performance EGPRS Enhanced General Packet Radio Service EGPRS2 Enhanced General Packet Radio Service phase 2 FTP File Transfer Protocol GoS Grade of Service IRC Interference Rejection Combining LA Link Adaptation MCBTS Multi-Carrier BTSMCPA Multi-Carrier Power Amplifier NC1 Network Control mode 1 RE Radio EquipmentSAIC Sing
