1、 ETSI TR 125 956 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); Universal Terrestrial Radio Access (UTRA) repeater planning guidelines and system analysis (3GPP TR 25.956 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 125 956 V15.0.0 (2018-07)13GPP TR 25.956 version 1
2、5.0.0 Release 15Reference RTR/TSGR-0425956vF00 Keywords UMTS 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 Imp
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9、3GPP TR 25.956 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 ETSI members and non-members,
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13、ention 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). The present document may ref
14、er 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 under http:/webapp.etsi.org/k
15、ey/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). “must“ and “must not“ are N
16、OT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 125 956 V15.0.0 (2018-07)33GPP TR 25.956 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions, symbols and ab
17、breviations . 6g33.1 Definitions 6g33.2 Symbols 7g33.3 Abbreviations . 7g34 System Impacts of Repeaters . 7g34.1 Error Vector Magnitude (EVM) . 7g34.2 Peak Code Domain Error (PCDE) 8g34.3 Frequency error 8g34.4 Adjacent Channel Leakage Ratio (ACLR) . 8g34.5 Time Delay . 9g34.6 Location Services (LCS
18、) 10g34.6.1 OTDOA 10g34.6.2 Cell coverage based positioning method 11g34.6.3 Network assisted GPS methods 11g34.7 Automatic Gain Control (AGC) . 11g34.8 Adjacent Channel Rejection Ratio (ACRR) . 12g35 Planning with Repeaters . 12g35.1 Sole System 12g35.1.1 Antenna Isolation 12g35.1.2 Coupling loss m
19、easurements. 13g35.1.3 Gain Settings . 13g35.1.4 Delay. 14g35.2 Co-existence with UTRA FDD 14g35.2.1 Out of band gain . 14g35.2.2 Isolation 14g35.2.2.1 Example on application of equations 15g35.3 Co-existence with UTRA TDD 16g35.3.1 Isolation 16g35.4 Co-existence with GSM 900 and/or DCS 1800 16g35.4
20、.1 Isolation 16g35.5 Environments with low minimum coupling loss (MCL) 16g35.5.1 Normal repeater parameters 16g35.5.2 Repeater parameters adjusted to low MCL . 17g35.6 Analysis of out of band gain in the 3rd adjacent channel 18g35.6.1 MCL=70 dB 18g35.6.2 MCL=40 dB 18g36 System Simulations and Analys
21、is 19g36.1 Down-link co-existence simulations 19g36.2 Outdoor coverage (High CLRep-UE) . 21g36.3 Indoor coverage (Low CLRep-UE) 22g36.4 Repeater up-link co-existence simulations . 23g36.4.1 General 23g36.4.2 Simulation Assumptions . 25g36.4.3 Results 25g36.4.4 Conclusion 26g36.5 Repeater ACRR system
22、 impact simulations . 26g36.5.1 General 26g3ETSI ETSI TR 125 956 V15.0.0 (2018-07)43GPP TR 25.956 version 15.0.0 Release 156.5.2 Simulation Description . 27g36.5.2.1 Infrastructure . 27g36.5.2.2 Preparation 27g36.5.2.3 Connection 28g36.5.2.4 Iterations . 28g36.5.2.5 Parameters used through out the s
23、imulations 29g36.5.3 Results 31g36.5.3.1 288 m between repeater A and BSB . 31g36.5.3.2 164 m minimum distance between repeater A and BSB . 45g36.5.4 Conclusions. 58g36.5.5 Comments . 58g3Annex A: Change History . 59g3History 60g3ETSI ETSI TR 125 956 V15.0.0 (2018-07)53GPP TR 25.956 version 15.0.0 R
24、elease 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 contents of the present document, it w
25、ill 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 document under change control. y the
26、 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 125 956 V15.0.0 (2018-07)63GPP TR 25.956 version 15.0.0 Release 151 Sco
27、pe The purpose of the following document is to describe planning guidelines and system scenarios for UTRA repeaters. In addition it also contains simulations and analysis of the usage of repeaters in UMTS networks. 2 References The following documents contain provisions which, through reference in t
28、his 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
29、 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 25.942 2 R4-030365 3 Definitions, symbols and abbreviations 3.1 Definitions For the purpose
30、s of the present document, the following terms and definitions apply, unless otherwise stated: Figure 3.1 ACRRRepA Adjacent Channel Rejection Ratio for repeater A. ACGRepAAdjacent Channel Gain for repeater A. CLBSA-UEACoupling Loss between Base Station A and the User Equipment A. CLRepA-UEA Coupling
31、 Loss between Repeater A and User Equipment A. dRepAGroup delay of repeater A. EDoCLBSA-RepAEffective Donor Coupling Loss between the donor Base Station A and the Repeater A. GRepASet gain of Repeater A. GmaxRepAThe maximum Gain possible to set of Repeater A. MRepANoise Margin for repeater A. NFRepA
32、Noise Figure of repeater A. BSARepAUEAEDoCLBSA-RepACLBSA-UEACLRepA-UEAETSI ETSI TR 125 956 V15.0.0 (2018-07)73GPP TR 25.956 version 15.0.0 Release 15PrepAOutput power of repeater A. PmaxRepAMaximum output power of repeater A. PmaxBSAMaximum output power of base station A BS A UE A EDoCL BSA-RepA CL
33、BSB-UEB CL RepA-UEB BS B CL BSB-UEA UE B Rep A CLBSB-RepAFigure 3.2 CLBSB-UEACoupling Loss between Base station B and the User equipment A. CLRepA-UEB Coupling Loss between Repeater A and User equipment B. CLBSB-RepA Coupling Loss between Bas station B and Repeater A. CLBSB-UEB Coupling Loss between
34、 base station B and User equipment B. SsIR Signal to self Interference Ratio. (Described below) 3.2 Symbols (void) 3.3 Abbreviations (void) 4 System Impacts of Repeaters 4.1 Error Vector Magnitude (EVM) The introduction of a repeater has an impact in the EVM of the system. The basic effect is reflec
35、ted in a system noise rise, which can be calculated from the EVM value the received signal exhibits. The formula is Noise rise = 10 log(1 + EVM) In the scenario of a Repeater amplifying the signal the EVM of the signal is calculated according to the following formula for uncorrelated processes: (EVM
36、_total) = (EVM_NodeB) + (EVM_Repeater) Taking the specified value of 17,5 % for both the Node B (as well as for the UE) and the Repeater result in a total EVM of 24,7 %. Calculating the noise rise for the Repeater scenario gives a value of 0,26 dB in the area of the repeaters coverage. This compares
37、 to a noise rise in a scenario without Repeater of 0,13 dB. The difference between the two numbers is the worst-case closed loop power rise in an otherwise perfect system that would occur with a Repeater being used. ETSI ETSI TR 125 956 V15.0.0 (2018-07)83GPP TR 25.956 version 15.0.0 Release 154.2 P
38、eak Code Domain Error (PCDE) In the specification of the Peak Code Domain Error value of the Repeater -35 dB is used. The number for the Node B is -33dB. If we assume the processes in the Repeater that lead to the PCDE being independent of the equivalent process in the Node B we can assume that they
39、 can be treated as noise. In this case the resulting value for PCDE is calculated from the linear addition of the two signals that will lead to -31 dB. This is a 2 dB degradation to the value of the Node B. For the repeated cell the degradation might be negligible. In case of a neighbour cell the mi
40、ght be affected to some extend. Presumably the soft handover gain will be reduced by the tenth of a dB. 4.3 Frequency error The effect of the additional frequency error will be a reduction of the maximum speed. In the repeater core specification the minimum requirement on frequency stability is 0,01
41、 ppm. Hence, with the 0,05 ppm minimum requirement for the base station frequency stability the resulting “worst case“ for a signal that have been amplified by the repeater is 0,06 ppm. 4.4 Adjacent Channel Leakage Ratio (ACLR) With regard to the mentioned ACLR we have to investigate the behaviour o
42、f the Repeater. For this reason we use the model shown in the following Figure 4.1: Figure 4.1: Simplified Repeater model. The Repeater in its basic function is bi-directional amplifier of RF signals from Base Stations in the downlink path and from Universal Equipments (UE) as mobile stations in the
43、 uplink path. The operating bands in which the Repeater amplifies is determined by the IF filter in its bandwidth and by the duplexer filter in its frequency range for operational configuration. In our discussion we will use the parameters defined in Table 4.1. Table 4.1: Parameters of the Repeater
44、model. Parameter Description Unit Assumed value Comment G Repeater gain dB 90 dB UL and Dl gain should be the same for a balanced link. Pout_DL_max maximum Repeater average output power measured with WCDMA signal according to model 1 of TS25.141. dBm 30 dBm DL value Pout_UL_max maximum Repeater aver
45、age output power measured with WCDMA signal according to model 1 of TS25.141. dBm 12 dBm UL value NF Repeater Noise Figure dB 5 dB valid for UL and DL N_therm (30 kHz) Thermal Noise Power density in a Bandwidth of 30 kHz dBm / 30 kHz -129 dBm / 30kHz -174 dBm/Hz (at 25 C) + 45 dB S (30 kHz) WCDMA Si
46、gnal Power Density dBm / 30 kHz Pout - 21 dB the factor of 21 dB is the relation of channel bandwidth to 30 kHz The Repeater output noise density can be calculated according to the formula: N_Rep (30kHz) = N_therm (30kHz) +NF + G = -34 dBm/30 kHz . Considering the output of the Repeater in the Downl
47、ink path we will find an average power 30 dBm in the WCDMA channel. This is resulting in a signal density of ETSI ETSI TR 125 956 V15.0.0 (2018-07)93GPP TR 25.956 version 15.0.0 Release 15S_Downlink = +9 dBm/30 kHz. This leads to a signal-to-noise ratio of the Downlink of: S / N_Downlink = 43 dB. Th
48、e Adjacent Channel Leakage Ratio (ACLR) as defined for BS is stating -45 dB for the first adjacent channel and -50 dB for the second adjacent channel. This situation is illustrated in Figure 4.2. In the Repeater case the resulting output frequency spectrum is shown below. PowerDensity in dBm/HzFrequ
49、ency in MHzthermal Output NoiseWCDMA Signal with ACLRaccording BS Spec.S/NFig. 4.2: Repeater output frequency spectrum. It is obvious that the ACLR cannot be measured in the Repeater case due to the fact that the this signal is below the amplifier thermal noise of the Repeater amplifier chain. This even get worse when the Uplink is considered. As in this path the maximum average value of the output power is reduced to 12 dBm resulting in a signal power density of S = -9dBm / 30 kHz, the signal-to-noise ratio will be even smaller: S / N_Uplink = -9 dBm / 30 kHz
