IMTadvanced 系统干扰评估

《IMTadvanced 系统干扰评估》由会员分享，可在线阅读，更多相关《IMTadvanced 系统干扰评估（73页珍藏版）》请在装配图网上搜索。

1、Z:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF12CONTENTS3 1Introduction4 2Scope5 3Structure of the Report6 4Related documents7 5Evaluation guidelines8 6Characteristics for evaluation9 7Evaluation methodology10 8Test environments and evaluation configurati

2、ons11 9Channel model approach12 10References13 11List of acronyms and abbreviations14 Annex 1 Test environments and channel models15 Annex 2 Traffic modelsRadiocommunication Study GroupsDocument 5/69-E24 October 2008Source:Document 5D/TEMP/99(Rev.1)English onlyWorking Party 5DDRAFT NEW REPORT ITU-R

3、M.IMT.EVAL“Guidelines for evaluation of radio interface technologies for IMT-Advanced”- 2 -5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF1IntroductionInternational Mobile Telecommunications-Advanced (IMT-Advanced) systems are mobile systems that inc

4、lude the new capabilities of IMT that go beyond those of IMT-2000. Such systems provide access to a wide range of telecommunication services including advanced mobile services, supported by mobile and fixed networks, which are increasingly packet-based.IMT-Advanced systems support low to high mobili

5、ty applications and a wide range of data rates in accordance with user and service demands in multiple user environments. IMT-Advanced also has capabilities for high-quality multimedia applications within a wide range of services and platforms providing a significant improvement in performance and q

6、uality of service.The key features of IMT-Advanced are:a high degree of commonality of functionality worldwide while retaining the flexibility to support a wide range of services and applications in a cost efficient manner;compatibility of services within IMT and with fixed networks;capability of in

7、terworking with other radio access systems;high-quality mobile services;user equipment suitable for worldwide use;user-friendly applications, services and equipment;worldwide roaming capability;enhanced peak data rates to support advanced services and applications (100 Mbit/s for high and 1 Gbit/s f

8、or low mobility were established as targets for research)1.These features enable IMT-Advanced to address evolving user needs.The capabilities of IMT-Advanced systems are being continuously enhanced in line with user trends and technology developments.2ScopeThis Report provides guidelines for both th

9、e procedure and the criteria (technical, spectrum and service) to be used in evaluating the proposed IMT-Advanced radio interface technologies (RITs) or Sets of RITs (SRITs) for a number of test environments and deployment scenarios for evaluation. These test environments are chosen to simulate clos

10、ely the more stringent radio operating environments. The evaluation procedure is designed in such a way that the overall performance of the candidate RIT/SRITs may be fairly and equally assessed on a technical basis. It ensures that the overall IMT-Advanced objectives are met.This Report provides, f

11、or proponents, developers of candidate RIT/SRITs and evaluation groups, the common methodology and evaluation configurations to evaluate the proposed candidate RIT/SRITs and system aspects impacting the radio performance.This Report allows a degree of freedom so as to encompass new technologies. The

12、 actual selection of the candidate RIT/SRITs for IMT-Advanced is outside the scope of this Report._1 Data rates sourced from Recommendation ITU-R M.1645.- 3 -5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDFThe candidate RIT/SRITs will be assessed base

13、d on those evaluation guidelines. If necessary, additional evaluation methodologies may be developed by each independent evaluation group to complement the evaluation guidelines. Any such additional methodology should be shared between evaluation groups and sent to the Radiocommunication Bureau as i

14、nformation in the consideration of the evaluation results by ITU-R and for posting under additional information relevant to the evaluation group section of the ITU-R IMT-Advanced web page (http:/www.itu.int/ITU-R/go/rsg5-imt-advanced).3Structure of the ReportSection 4 provides a list of the document

15、s that are related to this Report.Section 5 describes the evaluation guidelines.Section 6 lists the criteria chosen for evaluating the RITs.Section 7 outlines the procedures and evaluation methodology for evaluating the criteria.Section 8 defines the tests environments and selected deployment scenar

16、ios for evaluation; the evaluation configurations which shall be applied when evaluating IMT-Advanced candidate technology proposals are also given in this section.Section 9 describes a channel model approach for the evaluation.Section 10 provides a list of references.Section 11 provides a list of a

17、cronyms and abbreviations.The following Annexes form a part of this Report:Annex 1:Test environments and channel modelsAnnex 2:Traffic models4Related documentsResolution ITU-R 57Recommendation ITU-R M.1822Recommendation ITU-R M.1645Recommendation ITU-R M.1768Draft new Report ITU-R M.IMT.TECH (Doc. 5

18、/60)Draft new Report ITU-R M.IMT.REST (Doc. 5/68)Report ITU-R M.2038Report ITU-R M.2072Report ITU-R M.2074Report ITU-R M.2078Report ITU-R M.2079Recommendation ITU-R M.1224- 4 -5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF5Evaluation guidelinesIMT-A

19、dvanced can be considered from multiple perspectives, including the users, manufacturers, application developers, network operators, and service and content providers as noted in Section 4.2.2 in Recommendation ITU-R M.1645 “Framework and overall objectives of the future development of IMT-2000 and

20、systems beyond IMT-2000”. Therefore, it is recognized that the technologies for IMT-Advanced can be applied in a variety of deployment scenarios and can support a range of environments, different service capabilities, and technology options. Consideration of every variation to encompass all situatio

21、ns is therefore not possible; nonetheless the work of the ITU-R has been to determine a representative view of IMT-Advanced consistent with the process defined in Resolution ITU-R 57, “Principles for the process of development of IMT-Advanced” and the requirements defined in draft new Report ITU-R M

22、.IMT.TECH.The parameters presented in this document are for the purpose of consistent definition, specification, and evaluation of the candidate RITs/SRITs for IMT-Advanced in ITU-R in conjunction with the development of Recommendations and Reports such as the framework and key characteristics and t

23、he detailed specifications of IMT-Advanced. These parameters have been chosen to be representative of a global view of IMT-Advanced but are not intended to be specific to any particular implementation of an IMT-Advanced technology. They should not be considered as the values that must be used in any

24、 deployment of any IMT-Advanced system nor should they taken as the default values for any other or subsequent study in ITU or elsewhere.Further consideration has been given in the choice of parameters to balancing the assessment of the technology with the complexity of the simulations while respect

25、ing the workload of an evaluator or technology proponent.This procedure deals only with evaluating radio interface aspects. It is not intended for evaluating system aspects (including those for satellite system aspects).The following principles are to be followed when evaluating radio interface tech

26、nologies for IMT-Advanced:Evaluations of proposals can be through simulation, analytical and inspection procedures.The evaluation shall be performed based on the submitted technology proposals, and should follow the evaluation guidelines, use the evaluation methodology and adopt the evaluation confi

27、gurations defined in this Report.Evaluations through simulations contain both system level simulations and link level simulations. Evaluation groups may use their own simulation tools for the evaluation.In case of analytical procedure the evaluation is to be based on calculations using the technical

28、 information provided by the proponent.In case of evaluation through inspection the evaluation is based on statements in the proposal.The following options are foreseen for the groups doing the evaluations.Self-evaluation must be a complete evaluation (to provide a fully complete compliance template

29、) of the technology proposal.An external evaluation group may perform complete or partial evaluation of one or several technology proposals to assess the compliance of the technologies with the minimum requirements of IMT-Advanced.Evaluations covering several technology proposals are encouraged.- 5

30、-5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF6Characteristics for evaluationThe technical characteristics chosen for evaluation are explained in detail in draft new Report ITU-R M.IMT.REST Section 2, including service aspect requirements which are

31、 based on Recommendation ITU-R M.1822, spectrum aspect requirements, and requirements related to technical performance, which are based on draft new Report ITU-R M.IMT.TECH. These are summarised in the following table, together with the high level assessment method:Simulation (including system and l

32、ink-level simulations, according to the principles of simulation procedure given in Section 7.1).Analytical (via a calculation).Inspection (by reviewing the functionality and parameterisation of the proposal).TABLE 6-1Characteristic for evaluationMethodEvaluation methodology / configurationsRelated

33、section of draft new Reports ITU-R M.IMT.TECH and M.IMT.RESTCell spectral efficiencySimulation (system level)Section 7.1.1; Table 8-2, 8-4 and 8-5draft new Report ITU-R M.IMT.TECH Section 4.1Peak spectral efficiencyAnalyticalSection 7.3.1; Table 8-3draft new Report ITU-R M.IMT.TECH Section 4.2Bandwi

34、dthInspectionSection 7.4.1draft new Report ITU-R M.IMT.TECH Section 4.3Cell edge user spectral efficiencySimulation (system level)Section 7.1.2; Table 8-2, 8-4 and 8-5draft new Report ITU-R M.IMT.TECH Section 4.4Control plane latencyAnalyticalSection 7.3.2; Table 8-2draft new Report ITU-R M.IMT.TECH

35、 Section 4.5.1User plane latencyAnalyticalSection 7.3.3; Table 8-2draft new Report ITU-R M.IMT.TECH Section 4.5.2MobilitySimulation (system and link level)Section 7.2; Table 8-2 and 8-7draft new Report ITU-R M.IMT.TECH Section 4.6Intra- and inter-frequency handover interruption timeAnalyticalSection

36、 7.3.4; Table 8-2draft new Report ITU-R M.IMT.TECH Section 4.7Inter-system handoverInspectionSection 7.4.3draft new Report ITU-R M.IMT.TECH Section 4.7VoIP capacitySimulation (system level)Section 7.1.3; Table 8-2, 8-4 and 8-6draft new Report ITU-R M.IMT.TECH Section 4.8Deployment possible in at lea

37、st one of the identified IMT bandsInspectionSection 7.4.2draft new Report ITU-R M.IMT.REST Section 2.2 Channel bandwidth scalabilityInspectionSection 7.4.1draft new Report ITU-R M.IMT.TECH Section 4.3Support for a wide range of servicesInspectionSection 7.4.4draft new Report ITU-R M.IMT.REST Section

38、 2.1Section 7 defines the methodology for assessing each of these criteria.- 6 -5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF7Evaluation methodologyThe submission and evaluation process is defined in Document IMT-ADV/2(Rev.1).Evaluation should be p

39、erformed in strict compliance with the technical parameters provided by the proponents and the evaluation configurations specified for the deployment scenarios in Section 8.4 of draft new Report ITU-R M.IMT.EVAL. Each requirement should be evaluated independently, except for the cell spectral effici

40、ency and cell edge user spectral efficiency criteria that shall be assessed jointly using the same simulation, and that consequently the candidate RIT/SRITs also shall fulfil the corresponding minimum requirements jointly. Furthermore, the system simulation used in the mobility evaluation should be

41、the same as the system simulation for cell spectral efficiency and cell edge user spectral efficiency.The evaluation methodology should include the following elements:1)Candidate RIT/SRITs should be evaluated using reproducible methods including computer simulation, analytical approaches and inspect

42、ion of the proposal.2)Technical evaluation of the candidate RIT/SRITs should be made against each evaluation criterion for the required test environments.3)Candidate RIT/SRITs should be evaluated based on technical descriptions that are submitted using a technologies description template.In order to

43、 have a good comparability of the evaluation results for each proposal, the following solutions and enablers are to be taken into account:Use of unified methodology, software, and data sets by the evaluation groups wherever possible, e.g. in the area of channel modelling, link-level data, and link-t

44、o-system-level interface.Evaluation of multiple proposals using one simulation tool by each evaluation group is encouraged.Question-oriented working method that adapts the level of detail in modelling of specific functionalities according to the particular requirements of the actual investigation.Ev

45、aluation of cell spectral efficiency, peak spectral efficiency, cell edge user spectral efficiency and VoIP capacity of candidate RIT/SRITs should take into account the layer 1 and layer 2 overhead information provided by the proponents, which may vary when evaluating different performance metrics a

46、nd deployment scenarios.7.1System simulation proceduresSystem simulation shall be based on the network layout defined in Section 8.3 of draft new Report ITU-R M.IMT.EVAL. The following principles shall be followed in system simulation:Users are dropped independently with uniform distribution over pr

47、edefined area of the network layout throughout the system. Each mobile corresponds to an active user session that runs for the duration of the drop.Mobiles are randomly assigned LOS and NLOS channel conditions.Cell assignment to a user is based on the proponents cell selection scheme, which must be

48、described by the proponent.The minimum distance between a user and a base station is defined in Table 8-2 in Section 8.4 of draft new Report ITU-R M.IMT.EVAL.- 7 -5/69-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDFFading signal and fading interference ar

49、e computed from each mobile station into each cell and from each cell into each mobile station (in both directions on an aggregated basis).The IoT2 (interference over thermal) parameter is an uplink design constraint that the proponent must take into account when designing the system such that the a

50、verage experience IoT value in the evaluation is equal to or less than 10 dB.In simulations based on the full-buffer traffic model, packets are not blocked when they arrive into the system (i.e. queue depths are assumed infinite).Users with a required traffic class shall be modelled according to the

51、 traffic models defined in Annex 2.Packets are scheduled with an appropriate packet scheduler(s) proposed by the proponents for full buffer and VoIP traffic models separately. Channel quality feedback delay, feedback errors, PDU (protocol data unit) errors, real channel estimation effects inclusive

52、of channel estimation error are modelled and packets are retransmitted as necessary.The overhead channels (i.e., the overhead due to feedback and control channels) should be realistically modelled.For a given drop the simulation is run and then the process is repeated with the users dropped at new r

53、andom locations. A sufficient number of drops are simulated to ensure convergence in the user and system performance metrics. Proponent should provide information on the width of confidence intervals of user and system performance metrics of corresponding mean values, and evaluation groups are encou

54、raged to provide these information.3Performance statistics are collected taking into account the wrap-around configuration in the network layout, noting that wrap-around is not considered in the indoor case.All cells in the system shall be simulated with dynamic channel properties using a wrap- arou

55、nd technique, noting that wrap-around is not considered in the indoor case.In order to perform less complex system simulations, often the simulations are divided into separate link and system simulations with a specific link-to-system interface. Another possible way to reduce system simulation compl

56、exity is to employ simplified interference modelling. Such methods should be sound in principle, and it is not within the scope of this document to describe them.Evaluation groups are allowed to use such approaches provided that the used methodologies arewell described and made available to the Radi

57、ocommunication Bureau and other evaluation groups;included in the evaluation report.Realistic link and system models should apply including error modelling, e.g., for channel estimation and for the errors of control channels that are required to decode the traffic channel (including the feedback cha

58、nnel and channel quality information). The overheads of the feedback channel and the control channel should be modelled according to the assumptions used in the overhead channels radio resource allocation._2 The interference means the effective interference received at the base station.3 The confide

59、nce interval and the associated confidence level indicate the reliability of the estimated parameter value. The confidence level is the certainty (probability) that the true parameter value is within the confidence interval. The higher the confidence level the larger the confidence interval.- 8 -5/6

60、9-EZ:FILEROOT22021-111C523C02F-271A-46FC-AC47-2B8FB7FB00443B27A36367DC9A46BEECBEB2D6F9BEE5.PDF7.1.1Cell spectral efficiencyThe results from the system simulation are used to calculate the cell spectral efficiency as defined in draft new Report ITU-R M.IMT.TECH Section 4.1. The necessary information

61、includes the number of correctly received bits during the simulation period and the effective bandwidth which is the operating bandwidth normalised appropriately considering the uplink/downlink ratio for TDD system.Layer 1 and layer 2 overhead should be accounted for in time and frequency for the pu

62、rpose of calculation of system performance metrics such as cell spectral efficiency, cell edge user spectral efficiency, and VoIP. Examples of layer 1 overhead include synchronization, guard and DC subcarriers, guard/switching time (in TDD systems), pilots and cyclic prefix. Examples of layer 2 over

63、head include common control channels, HARQ ACK/NACK signalling, channel feedback, random access, packet headers and CRC. It must be noted that in computing the overheads, the fraction of the available physical resources used to model control overhead in layer 1 and layer 2 should be accounted for in

64、 a non-overlapping way. Power allocation/boosting should also be accounted for in modelling resource allocation for control channels.7.1.2Cell edge user spectral efficiencyThe results from the system simulation are used to calculate the cell edge user spectral efficiency as defined in draft new Repo

65、rt ITU-R M.IMT.TECH Section 4.4. The necessary information is the number of correctly received bits per user during the active session time the user is in the simulation. The effective bandwidth is the operating bandwidth normalised appropriately considering the uplink/downlink ratio for TDD system.

66、 It should be noted that the cell edge user spectral efficiency shall be evaluated using identical simulation assumptions as the cell spectral efficiency for that test environment.Examples of layer 1 and layer 2 overhead can be found in Section 7.1.1.7.1.3VoIP capacityThe VoIP capacity should be evaluated and compared against the requirements in draft new Report ITU-R M.IMT.TECH Section 4.8. VoIP capacity should be evaluated for the uplink and downlink directions assuming a 12.2 kbit/s codec wit