1、 ETSI TR 145 926 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Solutions for GSM/EDGE Base Transceiver Station (BTS) energy saving (3GPP TR 45.926 version 14.0.0 Release 14) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 145 926 V14.0.0 (2017-0
2、4)13GPP TR 45.926 version 14.0.0 Release 14Reference RTR/TSGR-0645926ve00 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、.0.0 (2017-04)23GPP TR 45.926 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
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12、rd This 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 correspondin
13、g 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 terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as
14、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 except when used in direct citation. ETSI ETSI TR 145 926 V14.0.0 (2017-04)33GPP TR 45.926 version 14.0.0 Release 14Contents Intellectual Pro
15、perty Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 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
16、.2 Energy Consumption of BTS . 8g35 Objectives . 9g35.1 Performance Objectives: energy efficiency target 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
17、.2.4 Support of legacy MSs 9g35.2.5 Implementation impacts to new MSs 9g35.2.6 Implementation impacts to BSS 9g35.2.7 Impacts to network planning . 10g36 Common Assumptions . 10g36.1 Reference Configuration 10g36.2 Evaluation Metrics . 11g36.3 Traffic Load profiles 11g36.4 Reference deployment scena
18、rios 12g36.5 MS characteristics 16g36.5.1 BCCH carrier power measurement sampling . 16g36.5.1.1 Idle mode 16g36.5.1.2 Connected mode 18g36.5.2 BCCH carrier power measurement accuracy 18g36.5.3 BCCH carrier power measurement averaging 18g36.5.4 BSIC Decoding . 18g36.5.5 Power reduction on TS precedin
19、g BCCH timeslot . 19g36.5.6 Handover, Cell Selection and Cell Reselection 19g36.5.7 Mobile velocity . 19g36.5.8 Mobile station types 19g36.6 BTS characteristics . 19g36.6.1 Network synchronization 19g36.6.2 Modelling of TRX power consumption 19g37 Candidate Solution: BCCH Carrier Power Reduction Met
20、hodology . 20g37.1 Introduction 20g37.2 Methodology 20g37.2.1 Variant 1 . 20g37.2.2 Variant 2 . 21g37.3 Evaluation. 21g37.3.1 Simulation Assumptions . 22g3ETSI ETSI TR 145 926 V14.0.0 (2017-04)43GPP TR 45.926 version 14.0.0 Release 147.3.2 Evaluations . 23g37.3.2.1 Impacts to Radiated Power and Powe
21、r Consumption . 23g37.3.2.2 Impacts to Call Quality . 24g37.3.2.3 Impacts to Handover . 25g37.4 Conclusion 26g38 Candidate Solution: Output Power Reduction on BCCH Carrier for GMSK 27g38.1 Introduction 27g38.2 Concept Description . 27g38.2.1 Overview 27g38.2.2 Exemplary Scenario 27g38.3 Concept Eval
22、uation 28g38.3.0 Overview 28g38.3.1 Simulation Model . 28g38.3.1.1 Simulation Assumptions . 28g38.3.1.2 Channel Allocation Strategies . 32g38.3.1.3 Deployment Scenarios and Network Layout . 32g38.3.1.4 Output Power Reduction Settings on BCCH carrier . 33g38.3.1.5 Employed Link-to-System Mapping . 34
23、g38.3.2 Simulation Results 34g38.3.2.1 Scenario S1 . 34g38.3.2.2 Scenario S2 . 35g38.3.2.3 Scenario S3 . 36g38.3.2.4 Scenario S4 . 37g38.3.2.5 Scenario M1 37g38.3.2.6 Scenario M2 38g38.3.2.7 Impact on performance of neighbour cell identification in connected mode 39g38.3.2.8 Impact on performance of
24、 neighbour cell identification in idle mode 40g38.3.2.9 Results for the alternative MS velocity . 42g38.3.2.9.1 Scenario S5 42g38.3.2.9.2 Scenario S6 43g38.3.2.9.3 Impact on performance of neighbour cell identification in connected mode . 44g38.3.2.9.4 Impact on performance of neighbour cell identif
25、ication in idle mode . 44g38.3.3 Impact to Specifications 45g38.3.3.2.1 Example implementation of option 2 in the specifications 48g38.3.3.3.1 Example implementation of option 3 in the specifications 51g310.5.2.11 Control Channel Description . 51g38.4 Conclusion 54g39 Summary and Conclusions . 55g3A
26、nnex A: Bibliography 57g3Annex B: Change history 58g3History 59g3ETSI ETSI TR 145 926 V14.0.0 (2017-04)53GPP TR 45.926 version 14.0.0 Release 14Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to contin
27、uing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents 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 pres
28、ented to TSG for information; 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 third digit is incremented when editorial on
29、ly changes have been incorporated in the document. Introduction Energy saving is important for operators 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
30、 base stations in Africa and India use diesel as the primary or as a backup power source. Furthermore, 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 v
31、oice usage, data usage (e.g. introduction of smart phones, MTC devices, etc.) and more dense networks, 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 t
32、he energy consumption of base stations will also facilitate the possibility for operators to power all 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 V14.0.0 (2017-04)63GPP TR 45.926 version
33、 14.0.0 Release 141 Scope The present document provides a study into BTS energy saving solutions. The 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
34、: - Reduction of Power on the BCCH carrier (potentially enabling dynamic adjustment of BCCH power) - Reduction 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 co
35、ncepts as discussed in RAN 4) - Deactivation of other RATs in areas with multi-RAT deployments, for example, 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 solu
36、tions will also consider the following aspects: - Impacts on the time for legacy and new mobile stations 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 implement
37、ation and power consumption, e.g. due to reduction in DL power, cell (re-)selection performance, handover 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. solution
38、s that are non-backwards compatible towards legacy mobile stations will be out of the scope of this study). 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 refer
39、ence 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 vers
40、ion 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: “Vocabulary for 3GPP Specifications“. 2 3GPP TR 41.001: “GSM Release
41、 specifications“. 3 ETSI TS 102 706: “Energy Efficiency of Wireless Access Network Equipment“. 4 3GPP 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
42、 TR 45.913: “Optimized transmit pulse shape for downlink Enhanced General Packet Radio Service (EGPRS2-B)“. ETSI ETSI TR 145 926 V14.0.0 (2017-04)73GPP TR 45.926 version 14.0.0 Release 148 3GPP TR 45.050: “Background for Radio Frequency (RF) requirements“. 9 3GPP TR 45.914: “Circuit switched voice c
43、apacity evolution for GSM/EDGE Radio Access Network (GERAN)“. 10 3GPP TS 24.008: “Mobile radio interface 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
44、 3 specification; Radio Resource Control (RRC) protocol“. 3 Definitions, 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 defini
45、tion of the same term, if any, in TR 21.905 1. busy hour: one hour period during which occurs the maximum 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 lo
46、ad during time when there is only very low traffic in network medium term load: defined BTS load level 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 d
47、efined in the present document takes precedence over the definition of the same abbreviation, if any, 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 Do
48、wnlink 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
49、Network Control mode 1 RE Radio Equipment SAIC Single Antenna Interference Cancellation SCPA Single Carrier Power Amplifier TRX Transceiver VAMOS Voice services over Adaptive Multi-user channels on One Slot ETSI ETSI TR 145 926 V14.0.0 (2017-04)83GPP TR 45.926 version 14.0.0 Release 144 Study Considerations 4.0 General This clause depicts considerations on appropriate network scenarios and on qualitative analysis of the BTS energy consumption. 4.1 Network Scenario Considerations All the scenarios to be studied in BTS energy saving are listed
