1、 ETSI TR 125 963 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); Feasibility study on interference cancellation for UTRA FDD User Equipment (UE) (3GPP TR 25.963 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 125 963 V15.0.0 (2018-07)13GPP TR 25.963 version 15.0.0 Relea
2、se 15Reference RTR/TSGR-0425963vf00 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
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15、m.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 NOT allowed
16、in ETSI deliverables except when used in direct citation. ETSI ETSI TR 125 963 V15.0.0 (2018-07)33GPP TR 25.963 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 7g32 References 7g33 Abbreviations . 10g34
17、Receiver methods . 10g34.1 Two-branch interference mitigation . 10g34.2 One-branch interference mitigation 12g35 Network scenarios 12g36 Interference modelling . 13g36.1 General . 13g36.2 Statistical measures 14g36.2 Interference profile based on median values 14g36.3 Interference profiles based on
18、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 Summary 25g37 Transmitted code/power characteristics . 26g37.0 General . 26g37.1 Transmitted code and power characteristic in case of
19、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+R99 scenario . 27g37.1.2.2 Transmitted code and power characteristics for HSDPA-only scenario . 28g37.1.3 Interfering cells . 29g37.1.3.1 Tran
20、smitted code and power characteristics for HSDPA+R99 scenario . 29g37.1.3.2 Transmitted code and power characteristics for HSDPA-only scenario . 30g37.1.4 Model for the power control sequence generation 31g38 Link performance characterization . 31g38.0 General . 31g38.1 Overview . 31g38.2 Simulation
21、 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 approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of sub
22、stance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction A study item for further improved minimum performance requirements for UMTS/HSDPA UE (FDD) was approved at the 3GPP RAN #3
23、0 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 interference cancellation/mitigation UE receivers. These receivers attempt to cancel the interference that arises from users operating outs
24、ide 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 as AWGN, and as such can not be cancelled. The study item has developed models for this interference in terms of the number of i
25、nterfering 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) ratios. DIP ratios have been defined based on three criteria; median values of the corresponding cumulative density functions, w
26、eighted 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 mixture of HSDPA and Rel. 99 voice traffic (HSDPA+R99). Interference aware receivers, referred to as type 2i and type 3i, were def
27、ined 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 account not only the channel response matrix of the serving cell, but also the channel response matrices of the most significant in
28、terfering cells. HSDPA throughput estimates are developed using link level simulations, which include the other-cell interference model plus OCNS models for the serving and interfering cells based on the two network scenarios considered. In addition, system level performance is assessed to determine
29、 the gains that interference cancellation/mitigation receiver might provide in throughput and coverage. Complexity issues associated with implementing 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 docu
30、ment 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 Cancellation (IC) receivers. The reference receivers for the type 2i and type 3i are defined, both of which are based on LMMSE sub-ch
31、ip level equalizers with interference-aware capabilities. Clause 5 describes the two network scenarios that were defined and used to generate the interference statistics, which were then used to develop the interference models described in clause 6. Clause 6 defines the interference models/profiles
32、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 three types of interference profiles considered. ETSI ETSI TR 125 963 V15.0.0 (2018-07)63GPP TR 25.963 version 15.0.0 Release 15Claus
33、e 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 latter definitions essentially define the signal characteristics of the desired user, the common channels and the OCNS for both serv
34、ing 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 system level performance characterization. Clause 10 discusses the possible receiver implementation losses for a two-branch, sub-chip
35、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 V15.0.0 (2018-07)73GPP TR 25.963 version 15.0.0 Release 151 Scope The objective of this study is to evaluate the feasibility and po
36、tential performance improvements of interference cancellation/mitigation techniques for UTRA FDD UE receivers, based on realistic network scenarios. Scope of the work includes: - Determine realistic network scenarios. - Determine suitable interference models for other cell interference. - Evaluate t
37、he feasibility of two-branch interference cancellation receivers through link and system level analysis and simulations. - Evaluate feasibility of one-branch interference cancellation receivers through link and system level analysis and simulations. 2 References The following documents contain provi
38、sions which, through reference 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
39、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 of that document in the same Release as the present document. 1 RP-050764, “New Study Item Proposal: Further Improved Perf
40、ormance Requirements for UMTS/HSDPA UE“, Cingular Wireless, RAN #30. 2 R4-060514, “Reference structure for interference mitigation simulations with HSDPA and receiver diversity“, Nokia, RAN4 #39. 3 R4-060364, “Minutes of Ad Hoc on Further Improved Performance Requirements for UMTS/HSDPA UE (FDD)“, N
41、okia, RAN4 #38. 4 R4-060117, “Analysis for simulation scenario definition to interference mitigation studies“, Nokia, RAN4#38. 5 R4-060180, “Network Scenarios and Associated Interference Profiles for Evaluation of Generalized Interference Cancellation (IC) Receivers“, Cingular, RAN4 #38. 6 TR 25.848
42、 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 (Release 6)“. 8 R4-060959, “Throughput simulation results for Type 3 and Type 3i receivers with shadow fading and realistic DIP va
43、lues 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 simulation results for scenario definition to interference mitigation studies“, Nokia, RAN4 #39. 11 R4-060391, “HSDPA Netw
44、ork Scenario and Associated Interference Profile for Evaluation of Generalized Interference Cancellation (IC) Receivers“, Cingular/AT Selection procedures 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
45、 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 document, the following abbreviations apply: DIP Dominant Interferer Proportion IC Interference Cancellation LMMSE Linear Minim
46、um 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 and without receive diversity for evaluating the benefits for interference mitigation 2. In the assumptions used in earlie
47、r 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 presented in following clauses the interference structure is now assumed to be colored and the covariance matrix is structured base
48、d 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 while the approach to derive (estimate) the interference covariance matrix does not need to be defined. 4.1 Two-branch interfer
49、ence mitigation The received signal is assumed to be expressed as a sum of “own“ signal, interfering signals and the white noise: noisewhitenoisecolouredNjjsignalownvectorsignalreceivedBSjndMdMr +=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 of two FIR filters w1and w2of length FNs: 2,1,)1()2()
