1、 ETSI TR 136 932 V14.0.0 (2017-04) LTE; Scenarios and requirements for small cell enhancements for E-UTRA and E-UTRAN (3GPP TR 36.932 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 136 932 V14.0.0 (2017-04)13GPP TR 36.932 version 14.0.0 Release 14Reference RTR/TSGR-0036932ve00 Keywords LTE
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7、rization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE
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9、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 can be found in ETSI SR 000 31
10、4: “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 investigati
11、on, 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)
12、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 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 “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the
14、 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 136 932 V14.0.0 (2017-04)33GPP TR 36.932 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3
15、Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Symbols 5g33.3 Abbreviations . 5g34 Introduction 6g35 Objective 6g36 Target scenarios 7g36.1 Deployment 7g36.1.1 With and without macro coverage 7g36.1.2 Outdoor a
16、nd indoor . 7g36.1.3 Ideal and non-ideal backhaul 8g36.1.4 Sparse and dense . 8g36.1.5 Synchronization 8g36.2 Spectrum. 9g36.3 Traffic . 9g36.4 Backward compatibility . 9g37 Deployment-related requirements 10g37.1 Deployment use cases 10g37.2 Co-existence and interworking . 10g37.3 Core network aspe
17、cts 10g38 Capability and performance requirements 11g38.1 System performance . 11g38.2 Mobility performance . 11g38.3 Coverage performance . 12g39 Operational Requirements 13g39.1 Architecture 13g39.2 Cost and complexity . 13g39.3 Energy efficiency . 13g39.4 Security 13g3Annex A: Change history 14g3
18、History 15g3ETSI ETSI TR 136 932 V14.0.0 (2017-04)43GPP TR 36.932 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 continuing work within the TSG and may change following for
19、mal 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 presented to TSG for information; 2 presented to TSG for
20、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 incorporated in the document. ET
21、SI ETSI TR 136 932 V14.0.0 (2017-04)53GPP TR 36.932 version 14.0.0 Release 141 Scope The present document contains scenarios and requirements for the small cell enhancement for E-UTRA and E-UTRAN. 2 References The following documents contain provisions which, through reference in this text, constitu
22、te 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 the case of
23、 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 TS 36.839: “Evolved Universal Terrestrial Radio Ac
24、cess (E-UTRA); Mobility enhancements in heterogeneous networks“. 3 3GPP TR 36.913: “Requirements for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) (LTE-Advanced)“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the te
25、rms and definitions given in TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. 3.2 Symbols For the purposes of the present document, the following symbols apply: 3.3 Abbreviations For the purpose
26、s of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. CDF: Cumulative Distribution Function VoLTE Voice over LTE ETSI ETSI TR 13
27、6 932 V14.0.0 (2017-04)63GPP TR 36.932 version 14.0.0 Release 144 Introduction Small cells using low power nodes are considered promising to cope with mobile traffic explosion, especially for hotspot deployments in indoor and outdoor scenarios. A low-power node generally means a node whose Tx power
28、is lower than macro node and BS classes, for example Pico and Femto eNB are both applicable. Small cell enhancements for E-UTRA and E-UTRAN will focus on additional functionalities for enhanced performance in hotspot areas for indoor and outdoor using low power nodes. This document captures the scen
29、arios and requirements for small cell enhancements. 3GPP TR 36.913 3 should be used as reference whenever applicable in order to avoid duplication of the requirements. 5 Objective The objectives of this document are as follows: A) Define target scenarios for small cell enhancement considering: - Dep
30、loyment scenarios of small cell nodes - Spectrum usage for small cell scenarios - Traffic characteristics in small cell scenarios B) Define requirements for small cell enhancement scenarios considering: - System, mobility and coverage performance - Core network related aspects - Cost and energy effi
31、ciency aspects - Security aspects ETSI ETSI TR 136 932 V14.0.0 (2017-04)73GPP TR 36.932 version 14.0.0 Release 146 Target scenarios 6.1 Deployment Small cell enhancement should target both with and without macro coverage, both outdoor and indoor small cell deployments and both ideal and non-ideal ba
32、ckhaul. Both sparse and dense small cell deployments should be considered. (See Fig. 6.1-1) NOTE 1: F1 and F2 are the carrier frequency for macro layer and local-node layer, respectively Figure 6.1-1: Deployment scenarios of small cell with/without macro coverage 6.1.1 With and without macro coverag
33、e As shown in Fig. 6.1-1, small cell enhancement should target the deployment scenario in which small cell nodes are deployed under the coverage of one or more than one overlaid E-UTRAN macro-cell layer(s) in order to boost the capacity of already deployed cellular network. Two scenarios can be cons
34、idered: 1. Where the UE is in coverage of both the macro cell and the small cell simultaneously 2. Where the UE is not in coverage of both the macro cell and the small cell simultaneously Figure 6.1-1 also shows the scenario where small cell nodes are not deployed under the coverage of one or more o
35、verlaid E-UTRAN macro-cell layer(s). This scenario is also the target of the small cell enhancement Study Item. 6.1.2 Outdoor and indoor Small cell enhancement should target both outdoor and indoor small cell deployments. The small cell nodes could be deployed indoors or outdoors, and in either case
36、 could provide service to indoor or outdoor UEs. For indoor UE, only low UE speed (0 3 km/h) is targeted. For outdoor, not only low UE speed, but also medium UE speed (up to 30km/h and potentially higher speeds) is targeted. Both throughput and mobility/connectivity shall be used as performance metr
37、ic for both low and medium mobility. Cell edge performance (e.g. 5%-tile CDF point for user throughput) and power efficiency (of both network and UE) are also used as metrics for further study. F1 F2 ETSI ETSI TR 136 932 V14.0.0 (2017-04)83GPP TR 36.932 version 14.0.0 Release 146.1.3 Ideal and non-i
38、deal backhaul Both ideal backhaul (i.e., very high throughput and very low latency backhaul such as dedicated point-to-point connection using optical fiber) and non-ideal backhaul (i.e., typical backhaul widely used in the market such as xDSL, microwave, and other backhauls like relaying) should be
39、studied. The performance-cost trade-off should be taken into account. A categorization of non-ideal backhaul based on operator inputs is listed in Table 6.1-1: Table 6.1-1: Categorization of non-ideal backhaul Backhaul Technology Latency (One way) Throughput Priority (1 is the highest) Fiber Access
40、1 10-30ms 10M-10Gbps 1 Fiber Access 2 5-10ms 100-1000Mbps 2 Fiber Access 3 2-5ms 50M-10Gbps 1 DSL Access 15-60ms 10-100 Mbps 1 Cable 25-35ms 10-100 Mbps 2 Wireless Backhaul 5-35ms 10Mbps 100Mbps typical, maybe up to Gbps range 1 A categorization of ideal backhaul based on operator inputs is listed i
41、n Table 6.1-2: Table 6.1-2: Categorization of ideal backhaul Backhaul Technology Latency (One way) Throughput Priority (1 is the highest) Fiber Access 4 (NOTE 1) less than 2.5 us (NOTE2) Up to 10Gbps 1 NOTE 1: This can be applied between the eNB and the remote radio head. NOTE 2: propagation delay i
42、n the fiber/cable is not included. For interfaces between macro and small cell, as well as between small cells, the studies should first identify which kind of information is needed or beneficial to be exchanged between nodes in order to get the desired improvements before the actual type of interfa
43、ce is determined. And if direct interface should be assumed between macro and small cell, as well as between small cell and small cell, X2 interface can be used as a starting point. 6.1.4 Sparse and dense Small cell enhancement should consider sparse and dense small cell deployments. In some scenari
44、os (e.g., hotspot indoor/outdoor places, etc.), single or a few small cell node(s) are sparsely deployed, e.g. to cover the hotspot(s). Meanwhile, in some scenarios (e.g., dense urban, large shopping mall, etc.), a lot of small cell nodes are densely deployed to support huge traffic over a relativel
45、y wide area covered by the small cell nodes. The coverage of the small cell layer is generally discontinuous between different hotspot areas. Each hotspot area can be covered by a group of small cells, i.e. a small cell cluster. Furthermore, smooth future extension/scalability (e.g.: from sparse to
46、dense, from small-area dense to large-area dense, or from normal-dense to super-dense) should be considered. For mobility/ connectivity performance, both sparse and dense deployments should be considered with equal priority. 6.1.5 Synchronization Both synchronized and un-synchronized scenarios shoul
47、d be considered between small cells as well as between small cells and macro cell(s). For specific operations e.g. interference coordination, carrier aggregation and inter-eNB COMP, small cell enhancement can benefit from synchronized deployments with respect to small cell search/measurements and in
48、terference/resource management. Therefore time synchronized deployments of small cell clusters are prioritized in the study and new means to achieve such synchronization shall be considered. ETSI ETSI TR 136 932 V14.0.0 (2017-04)93GPP TR 36.932 version 14.0.0 Release 146.2 Spectrum Small cell enhanc
49、ement should address the deployment scenario in which different frequency bands are separately assigned to macro layer and small cell layer, respectively, where F1 and F2 in Fig. 6.1-1 correspond to different carriers in different frequency bands. Small cell enhancement should be applicable to all existing and as well as future cellular bands, with special focus on higher frequency bands, e.g., the 3.5 GHz band, to enjoy the more available spectrum and wider bandwidth. Small cell enhancement should also take into account the possibility for frequency bands
