ETSI TR 125 963-2017 Universal Mobile Telecommunications System (UMTS) Feasibility study on interference cancellation for UTRA FDD User Equipment (UE) (V14 0 0 3GPP TR 25 963 versi.pdf

1、 ETSI TR 125 963 V14.0.0 (2017-04) Universal Mobile Telecommunications System (UMTS); Feasibility study on interference cancellation for UTRA FDD User Equipment (UE) (3GPP TR 25.963 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 125 963 V14.0.0 (2017-04)13GPP TR 25.963 version 14.0.0 Relea

2、se 14Reference RTR/TSGR-0425963ve00 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 Important noti

3、ce The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authoriza

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9、ETSI TR 125 963 V14.0.0 (2017-04)23GPP TR 25.963 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 an

10、d non-members, and can be found in ETSI SR 000 314: “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/)

11、. Pursuant to the ETSI IPR Policy, no investigation, 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 prese

12、nt document. Foreword 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

13、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 terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to

14、 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 except when used in direct citation. ETSI ETSI TR 125 963 V14.0.0 (2017-04)33GPP TR 25.963 version 14.0.0 Release 14Conten

15、ts Intellectual Property Rights 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 Interf

16、erence modelling . 13g36.1 General . 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 o

17、n field data . 24g36.5 Summary 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 characteris

18、tics for HSDPA+R99 scenario . 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+R99 scenario . 29g37.1.3.2 Transmitted code and power characteristics for HSDPA-only scenario

19、. 30g37.1.4 Model for the 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

20、 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 only changes have been incorporat

21、ed in the document. Introduction 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

22、 and two-branch interference 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 inte

23、rference has been modelled 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 I

24、nterferer Proportion (DIP) 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),

25、and the other based on a mixture 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 equ

26、alizer which takes into account 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

27、 models for the serving and 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 impleme

28、nting these types of receivers 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 tw

29、o-branch Interference Cancellation (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

30、 interference statistics, 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 f

31、orms the basis of the three types of interference profiles considered. ETSI ETSI TR 125 963 V14.0.0 (2017-04)63GPP TR 25.963 version 14.0.0 Release 14Clause 7 defines the code and power characteristics of the signals transmitted by the serving and interfering cells for the two network scenarios defi

32、ned in clause 5. These latter 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 cla

33、use 9 summarizes the system 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 stud

34、y. ETSI ETSI TR 125 963 V14.0.0 (2017-04)73GPP TR 25.963 version 14.0.0 Release 141 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 scenari

35、os. Scope of the work includes: - 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 o

36、f one-branch interference 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

37、 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 reference implicitly re

38、fers to the latest version 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 HSD

39、PA and receiver diversity“, 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 Sc

40、enarios and Associated Interference 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 U

41、plink for UTRA FDD (Release 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 #4

42、0. 10 R4-060512, “Analysis 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 procedu

43、res for choice of radio transmission 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 pu

44、rposes of the present document, 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

45、 chip-level equalizer with 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.

46、 In the structure presented 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 th

47、e equalizer structure while 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: noisewhitenoisecolour

48、edNjjsignalownvectorsignalreceivedBSjndMdMr +=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

49、, the equalizer consists of two FIR filters w1and w2of length FNs: 2,1,)1()2()0( = iNFwNFwwTsisiiiLw(2) ETSI ETSI TR 125 963 V14.0.0 (2017-04)113GPP TR 25.963 version 14.0.0 Release 14where 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 sig