1、 ETSI TR 1Universal Mobile TelFeasibility studfor UTRA F(3GPP TR 25.9TECHNICAL REPORT 125 963 V13.0.0 (2016elecommunications System (u y on interference cancellatioFDD User Equipment (UE) .963 version 13.0.0 Release 1316-01) (UMTS); tion 13) ETSI ETSI TR 125 963 V13.0.0 (2016-01)13GPP TR 25.963 vers
2、ion 13.0.0 Release 13Reference RTR/TSGR-0425963vd00 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 7803/8
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9、ersion 13.0.0 Release 13Intellectual 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 be found in ETSI SR 000 314
10、: “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 IPR Policy, no investigatio
11、n, 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 This Technical Report (TR) h
12、as 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 ETSI deliverables. The cross
13、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 “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described
14、 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 125 963 V13.0.0 (2016-01)33GPP TR 25.963 version 13.0.0 Release 13Contents Intellectual Property Rig
15、hts 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 7g32 References 7g33 Abbreviations . 10g34 Receiver methods . 10g34.1 Two-branch interference mitigation . 10g34.2 One-branch interference mitigation 12g35 Network scenarios 12g36 Interference modelling . 13g36.1 G
16、eneral . 13g36.2 Statistical measures 14g36.2 Interference profile based on median values 14g36.3 Interference profiles based on weighted average throughput gain . 22g36.3.0 General 22g36.3.1 0 dB geometry . 23g36.3.2 -3 dB geometry . 23g36.4 Interference profiles based on field data . 24g36.5 Summa
17、ry 25g37 Transmitted code/power characteristics . 26g37.0 General . 26g37.1 Transmitted code and power characteristic in case of HSDPA 26g37.1.1 Common channels for serving and interfering cells . 26g37.1.2 Serving cell . 27g37.1.2.1 Transmitted code and power characteristics for HSDPA+R“99 scenario
18、 . 27g37.1.2.2 Transmitted code and power characteristics for HSDPA-only scenario . 28g37.1.3 Interfering cells . 29g37.1.3.1 Transmitted code and power characteristics for HSDPA+R“99 scenario . 29g37.1.3.2 Transmitted code and power characteristics for HSDPA-only scenario . 30g37.1.4 Model for the
19、power control sequence generation 31g38 Link performance characterization . 31g38.0 General . 31g38.1 Overview 31g38.2 Simulation results . 32g38.2.1 Types 2 and 2i - median DIP values . 32g38.2.2 Types 3 and 3i - median DIP values . 33g38.2.3 Weighted DIPS: geometries -3 2 presented to TSG for appr
20、oval; 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 only changes have been incorporated in the document. Introd
21、uction A study item for further improved minimum performance requirements for UMTS/HSDPA UE (FDD) was approved at the 3GPP RAN #30 meeting 1. This technical report summarizes the work that RAN4 has accomplished in this study item to assess the feasibility of both one-branch and two-branch interferen
22、ce cancellation/mitigation UE receivers. These receivers attempt to cancel the interference that arises from users operating outside the serving cell. This type of interference is also referred to as other-cell interference. In past link level evaluations, this type of interference has been modelled
23、 as AWGN, and as such can not be cancelled. The study item has developed models for this interference in terms of the number of interfering Node Bs to consider, and their powers relative to the total other cell interference power, the latter ratios referred to as Dominant Interferer Proportion (DIP)
24、 ratios. DIP ratios have been defined based on three criteria; median values of the corresponding cumulative density functions, weighted average throughput gain, and field data. In addition, two network scenarios are defined, one based solely on HSDPA traffic (HSDPA-only), and the other based on a m
25、ixture of HSDPA and Rel. 99 voice traffic (HSDPA+R99). Interference aware receivers, referred to as type 2i and type 3i, were defined as extensions of the existing type 2 and type 3 receivers, respectively. The basic receiver structure is that of an LMMSE sub-chip level equalizer which takes into ac
26、count not only the channel response matrix of the serving cell, but also the channel response matrices of the most significant interfering cells. HSDPA throughput estimates are developed using link level simulations, which include the other-cell interference model plus OCNS models for the serving an
27、d interfering cells based on the two network scenarios considered. In addition, system level performance is assessed to determine the gains that interference cancellation/mitigation receiver might provide in throughput and coverage. Complexity issues associated with implementing these types of recei
28、vers are also discussed. The content of each specific clause of the report is briefly described as follows. Clause 1 of this document defines the scope and objectives of this feasibility study. Clause 4 describes the receiver methods that can be applied to one-branch and two-branch Interference Canc
29、ellation (IC) receivers. The reference receivers for the type 2i and type 3i are defined, both of which are based on LMMSE sub-chip level equalizers with interference-aware capabilities. Clause 5 describes the two network scenarios that were defined and used to generate the interference statistics,
30、which were then used to develop the interference models described in clause 6. Clause 6 defines the interference models/profiles that were developed in order to assess the link level performance of IC receivers. The DIP ratio is defined as a key statistical measure, which forms the basis of the thre
31、e types of interference profiles considered. ETSI ETSI TR 125 963 V13.0.0 (2016-01)63GPP TR 25.963 version 13.0.0 Release 13Clause 7 defines the code and power characteristics of the signals transmitted by the serving and interfering cells for the two network scenarios defined in clause 5. These lat
32、ter definitions essentially define the signal characteristics of the desired user, the common channels and the OCNS for both serving and interfering cells. Clause 8 summarizes the link level simulation results based on the assumptions developed in clauses 6 and 7, while clause 9 summarizes the syste
33、m level performance characterization. Clause 10 discusses the possible receiver implementation losses for a two-branch, sub-chip based LMMSE equalizer with interference aware capabilities. Finally, clause 11 provides the relevant conclusions that can be taken from this study. ETSI ETSI TR 125 963 V1
34、3.0.0 (2016-01)73GPP TR 25.963 version 13.0.0 Release 131 Scope The objective of this study is to evaluate the feasibility and potential performance improvements of interference cancellation/mitigation techniques for UTRA FDD UE receivers, based on realistic network scenarios. Scope of the work incl
35、udes: - Determine realistic network scenarios. - Determine suitable interference models for other cell interference. - Evaluate the feasibility of two-branch interference cancellation receivers through link and system level analysis and simulations. - Evaluate feasibility of one-branch interference
36、cancellation receivers through link and system level analysis and simulations. 2 References 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 numb
37、er, 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 reference implicitly refers to the latest version
38、 of that document in the same Release as the present document. 1 RP-050764, “New Study Item Proposal: Further Improved Performance Requirements for UMTS/HSDPA UE“, Cingular Wireless, RAN #30. 2 R4-060514, “Reference structure for interference mitigation simulations with HSDPA and receiver diversity“
39、, Nokia, RAN4 #39. 3 R4-060364, “Minutes of Ad Hoc on Further Improved Performance Requirements for UMTS/HSDPA UE (FDD)“, Nokia, RAN4 #38. 4 R4-060117, “Analysis for simulation scenario definition to interference mitigation studies“, Nokia, RAN4#38. 5 R4-060180, “Network Scenarios and Associated Int
40、erference Profiles for Evaluation of Generalized Interference Cancellation (IC) Receivers“, Cingular, RAN4 #38. 6 TR 25.848 v4.0.0, “Physical layer aspects of UTRA High Speed Downlink Packet Access (Release 4)“. 7 TR 25.896 V6.0.0 (2004-3), “Feasibility Study for Enhanced Uplink for UTRA FDD (Releas
41、e 6)“. 8 R4-060959, “Throughput simulation results for Type 3 and Type 3i receivers with shadow fading and realistic DIP values for Ior/Ioc=0 dB“, InterDigital, RAN4 #40. 9 R4-061068, “Some observations on DIP values as a function of network geometries“, TensorComm, RAN4 #40. 10 R4-060512, “Analysis
42、 simulation results for scenario definition to interference mitigation studies“, Nokia, RAN4 #39. 11 R4-060391, “HSDPA Network Scenario and Associated Interference Profile for Evaluation of Generalized Interference Cancellation (IC) Receivers“, Cingular/AT Selection procedures for choice of radio tr
43、ansmission technologies of the UMTS (UMTS 30.03 version 3.2.0)“. 70 Globetrotter GT MAX 7.2 Ready Data Card from Option. 71 R4-050728, “Simulation Assumptions for Rx Diversity + LMMSE Equalizer Enhanced HSDPA Receiver (Type 3), Qualcomm, RAN4 #36. 3 Abbreviations For the purposes of the present docu
44、ment, the following abbreviations apply: DIP Dominant Interferer Proportion IC Interference Cancellation LMMSE Linear Minimum Mean Squared Error UE User Equipment UTRA UMTS Terrestrial Radio Access 4 Receiver methods In this clause we give the system equations for the LMMSE chip-level equalizer with
45、 and without receive diversity for evaluating the benefits for interference mitigation 2. In the assumptions used in earlier work for enhanced performance requirements Type 2 and Type 3 the interference structure was assumed to be white and the variance to be ideally known. In the structure presente
46、d in following clauses the interference structure is now assumed to be colored and the covariance matrix is structured based on ideal knowledge of the channel matrices of the interfering base stations. This enables the evaluation of benefits of interference mitigation in the equalizer structure whil
47、e the approach to derive (estimate) the interference covariance matrix does not need to be defined. 4.1 Two-branch interference mitigation The received signal is assumed to be expressed as a sum of “own“ signal, interfering signals and the white noise: noisewhitenoisecolouredNjjsignalownvectorsignal
48、receivedBSjndMdMr +=43421321100, (1)where ,.,0,BSNjj=M represents the channel matrix corresponding to BS j, containing the contribution from both receive antenna branches. The =HjHjj)()(21HHM where iH equals channel-matrix for the i-th receiver antenna. As a general concept, the equalizer consists o
49、f two FIR filters w1and w2of length FNs: 2,1,)1()2()0( = iNFwNFwwTsisiiiLw(2) ETSI ETSI TR 125 963 V13.0.0 (2016-01)113GPP TR 25.963 version 13.0.0 Release 13where the Nsis the number of samples per chip and F is the length of the equalizer in units of chips. The sampled received vectors at two antennas are denoted by ,2,1,)1()()1)1()( =+= iNFDmrNmrNDmrmTsisisiiLLr(3) where D is a delay parameter (0 LFD +). The equalization operation amounts to obtaining the filtered signal )()()(2211mmmyTTrwrw +
