1、 ETSI TS 103 175 V1.1.1 (2015-06) Intelligent Transport Systems (ITS); Cross Layer DCC Management Entity for operation in the ITS G5A and ITS G5B medium TECHNICAL SPECIFICATION ETSI ETSI TS 103 175 V1.1.1 (2015-06)2 Reference DTS/ITS-0020046 Keywords ITS, Spectral Management ETSI 650 Route des Lucio
2、les 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 notice The present document can be downloaded from: http:/www.etsi.org/standar
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7、 the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered
8、 for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 175 V1.1.1 (2015-06)3 Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g31 Scope 6g32 References
9、6g32.1 Normative references . 6g32.2 Informative references 7g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Symbols 9g33.3 Abbreviations . 9g34 Introduction 10g35 DCC architecture 11g35.1 Overview 11g35.2 DCC_ACC . 11g35.3 DCC_NET 12g35.4 DCC_FAC 12g35.5 DCC_CROSS . 12g36 DCC
10、 management entity 12g36.1 Overview 12g36.2 DCC parameter evaluation . 13g36.3 DCC_CROSS_Access 15g36.4 DCC_CROSS_Net . 16g36.5 DCC_CROSS_Facilities 16g37 DCC limits specification 17g37.1 Overview 17g37.2 Requirements 17g38 Interfaces 18g38.1 Overview 18g38.2 Interface (1) with DCC_ACC (MI SAP) 18g3
11、8.2.1 MI-GET.request 18g38.2.1.1 Function 18g38.2.1.2 Semantics 19g38.2.2 MI-GET.confirm . 19g38.2.2.1 Function 19g38.2.2.2 Semantics 19g38.2.3 MI-SET.request 19g38.2.3.1 Function 19g38.2.3.2 Semantics 20g38.2.4 MI-SET.confirm . 20g38.2.4.1 Function 20g38.2.4.2 Semantics 20g38.2.5 DCC Parameters at
12、the MI-SAP . 21g38.3 Interface (2) with DCC_NET (MN SAP) . 21g38.3.1 MN-GET.request 21g38.3.1.1 Function 21g38.3.1.2 Semantics 21g38.3.2 MN-GET.confirm . 22g38.3.2.1 Function 22g38.3.2.2 Semantics 22g38.3.3 MN-SET.request . 22g38.3.3.1 Function 22g3ETSI ETSI TS 103 175 V1.1.1 (2015-06)4 8.3.3.2 Sema
13、ntics 22g38.3.4 MN-SET.confirm 22g38.3.4.1 Function 22g38.3.4.2 Semantics 23g38.3.5 DCC Parameters at the MN-SAP 23g38.4 Interface (3) with DCC_FAC (MF SAP) . 24g38.4.1 MF-SET.request 24g38.4.1.1 Function 24g38.4.1.2 Semantics 24g38.4.2 MF-SET.confirm 24g38.4.2.1 Function 24g38.4.2.2 Semantics 24g38
14、.4.3 DCC Parameters at the MF-SAP 25g39 Test procedures 25g39.1 Introduction 25g39.2 General Test requirements 26g39.3 Test case 1: Homogeneous ITS traffic, energy threshold test 27g39.4 Test case 2: Homogeneous ITS traffic, header decoding test . 28g39.5 Test case 3: Sensitivity threshold correctio
15、n 28g39.6 Test case 4: DCC stability 28g3Annex A (informative): List of requirements . 30g3A.1 Introduction 30g3A.2 Requirements 30g3Annex B (informative): Other DCC entities 32g3B.1 Introduction 32g3B.2 DCC_ACC . 32g3B.3 DCC_NET 32g3B.4 DCC_FAC 33g3Annex C (informative): DCC algorithms capable of s
16、atisfying testable limits . 34g3C.1 Introduction 34g3C.2 State-Based Reactive DCC . 34g3C.3 Linear Adaptive DCC . 35g3History 36g3ETSI ETSI TS 103 175 V1.1.1 (2015-06)5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The in
17、formation 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: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from t
18、he ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). 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 th
19、e updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Intelligent Transport Systems (ITS). Modal verbs terminology In the present document “shall“, “shall not“
20、, “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 in ETSI deliverables except when used in direct citat
21、ion. ETSI ETSI TS 103 175 V1.1.1 (2015-06)6 1 Scope The present document specifies the functionality of the decentralized congestion control (DCC) entity residing in the management plane for the ITS-G5A, ITS-G5B, and ITS-G5D radio interfaces, collectively known as the 5 GHz ITS frequency band. The p
22、urpose of the DCC operation is to evaluate the load of the active radio channels and to optimize the radio channel usage by managing the ITS-S DCC parameters. Another purpose is to keep track and help the exchange of DCC parameters which cannot be conveyed via the data plane between the different la
23、yers. The present document specifies: The necessary support functions of DCC that needs to be in the management plane, i.e. cross-layer DCC operations. The required interface parameters between the DCC management entity and the DCC entities in the facilities, the networking Decentralized Congestion
24、Control Mechanisms for Intelligent Transport Systems operating in the 5 GHz range; Access layer part“. 3 ETSI EN 302 636-4-1: “Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint commu
25、nications; Sub-part 1: Media-Independent Functionality“. 4 ETSI TS 102 636-4-2: “Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; Sub-part 2: Media-dependent functio
26、nalities for ITS-G5“. 5 ETSI TS 102 723-1: “Intelligent Transport Systems (ITS); OSI cross-layer topics; Part 1: Architecture and addressing schemes“. 6 ETSI EN 302 665: “Intelligent Transport Systems (ITS); Communications Architecture“. 7 ETSI EN 302 663: “Intelligent Transport Systems (ITS); Acces
27、s layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band“. 8 ETSI EN 302 571: “Intelligent Transport Systems (ITS); Radiocommunications equipment operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonized EN covering the essential requirements of article
28、3.2 of the R Mitigation techniques to avoid interference between European CEN Dedicated Short Range Communication (CEN DSRC) equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range“. 2.2 Informative references References are either specific (identified by date of pub
29、lication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at t
30、he time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI TR 101 612: “Intelligent Transport Systems (ITS); Cross
31、 Layer DCC Management Entity for operation in the ITS G5A and ITS G5B medium; Report on Cross layer DCC algorithms and performance evaluation“. i.2 G. Bansal, J. Kenney, and C. Rohrs, “LIMERIC: A Linear Adaptive Message Rate Algorithm for DSRC Congestion Control“, IEEE Trans. Vehicular Technology, V
32、ol. 62, No. 9, Nov. 2013. i.3 B. Cheng, M. Gruteser, J. Kenney, G. Bansal, K. Sjoberg, “Performance Evaluation of a Mixed Vehicular Network with CAM-DCC and LIMERIC Vehicles“, Proceedings of the IEEE World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM15), Boston, USA, 2015. 3 Definitions,
33、 symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in IEEE 802.11-2012 1, ETSI EN 302 665 6, ETSI EN 302 663 7, ETSI EN 302 571 8 and the following apply: burst of messages: set of one or more messages that the gatekeeper transfers to
34、 the ITS-G5 radio at one time CBR target value: value used in GN as discriminator for the evaluation of the global CBR NOTE: In the present document it is set to a fixed value and equal to the congestion threshold CTHchannel busy ratio: time-dependent value between zero and one (both inclusive) repr
35、esenting the fraction of time that an individual radio channel used by an ITS-S was busy NOTE: This is one possible implementation of the channel load metric. channel resource limit: maximum amount of available resources of an individual radio channel used by an ITS-S NOTE: It corresponds to a trade
36、-off between the maximum usage of the channel for periodic safety-related messages, maximizing the performance of the ITS-G5 technology and allowing any event-based emergency packet to be reliably transmitted. chipset channel load: chipset data type that the DCC_ACC entity will transform into a loca
37、l channel specific CBR value cross-layer DCC: cooperation mechanisms based on entities distributed over several layers of the protocol stack which jointly work together to fulfil the operational requirements of DCC DCC_ACC: DCC entity located at the Access Layer that acts as a gatekeeper and also pr
38、ovides the local CBR values for all ITS-G5 radio channels used by a certain ITS-S DCC_CROSS: DCC cross-layer entity located in the management plane DCC_CROSS_Access: function in the DCC_CROSS entity that exchanges DCC control parameters with DCC_ACC ETSI ETSI TS 103 175 V1.1.1 (2015-06)8 DCC_CROSS_F
39、acilities: function in the DCC_CROSS entity that provides DCC control parameters to the facilities layer and to the applications DCC_CROSS_Net: function in the DCC_CROSS entity that provides DCC channel resources parameters to the networking and transport layer DCC_FAC: DCC entity located at the fac
40、ilities layer DCC fairness: concept where any ITS-S under the same channel conditions has an equal opportunity of accessing the radio channel for periodic messages, while maintaining a channel access margin to always allow the exchange of safety-critical event-based messages DCC flow control: functi
41、on that retrieves the messages from the DCC queues according to their priorities and transfers them for transmission to the ITS-G5 radio interface DCC flow control parameters: DCC parameters generated by the DCC_CROSS_Access that indicate to the DCC flow control the amount of available resources ava
42、ilable for transmission on the radio DCC_NET: DCC entity located in the networking DCC_NET located in the networking and transport layer as specified in ETSI TS 102 636-4-2 4; DCC_ACC located in the access layer as specified in ETSI TS 102 687 2; DCC_CROSS located in the management plane as specifie
43、d in the present document. The components are connected through the DCC interface 1 to interface 4 as shown in Figure 1. These interfaces are compliant with ETSI TS 102 723-1 5. Figure 1: DCC Architecture The DCC management entity (DCC_CROSS) in the management plane contains for each layer a functio
44、n that is connected to the interface towards the corresponding DCC entity in the communication stack. In clauses 5.2 to 5.5, an overview of the four DCC entities is given. The corresponding cross-layer functionalities in the management plane are addressed in clause 6 of the present document. 5.2 DCC
45、_ACC REQ001: The access layer of an ITS-S that transmits on an ITS-G5 radio channel shall include a DCC_ACC entity, as specified in ETSI TS 102 687 2, containing the access layer specific DCC functionalities such as those described in Annex B. ETSI ETSI TS 103 175 V1.1.1 (2015-06)12 5.3 DCC_NET REQ0
46、02: If GeoNetworking over ITS-G5 is in place, as described in ETSI EN 302 636-4-1 3, the network and transport layer of an ITS-S that transmits on an ITS-G5 radio channel shall include the DCC_NET entity, specified in ETSI TS 102 636-4-2 4, which contains the networking or when the global CBR is ava
47、ilable, the global CBR provided by DCC_NET. The ToffLimitdefined in this clause is calculated under the assumption that there is a fixed sensitivity threshold for the CL measurement for all stations in the system (see ETSI TS 102 687 2 for more details). Figure 7 shows the ToffLimit for typical mess
48、age durations Tonwith a DCC weight factor of Cw= 1. Figure 7: Toff Limit representation Although the present document does not specify a specific DCC algorithm, Annex C describes two algorithms that are capable of satisfying testable Tofflimits using a specific set of parameters. These algorithms ar
49、e capable of coexisting with each other (see i.3). REQ025: Other algorithms fulfilling the limits specification shall be capable of mutually coexisting with each other. 8 Interfaces 8.1 Overview The DCC_CROSS entities offer the interfaces illustrated in Figure 1. The primitives transferred over these interfaces are compliant with ETSI TS 102 723-1 5. 8.2 Interface (1) with DCC_ACC (MI SAP) 8.2.1 MI-GET.request 8.2.1.1 Function This primitive allows retrieving parameters from the access layer, as described in clauses 6.2
