1、ETSI TS 1 O1 493-2 1.2.1 (2001-12) Technical Specificafion Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Packet based Convergence Layer; Part 2: Ethernet Service Specific Convergence Sublayer (SSCS) 2 ETSI TS 101 493-2 V1.2.1 (2001-12) Reference RTS/BRAN-O024004-2Rl Keywords access, broad
2、band, HIPERLAN, radio ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of th
3、e present document can be downloaded from: http:l/w.etsi .orq The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In
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6、elecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI TS 101 493-2 V1.2.1 (2001-12) Contents Intellectual Property Rights . .4 Foreword . 4 1 2 3 3.1 3.2 3.3 4 5 5.1 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.3 5.3.1 5.3.2 5.4 5.4.1 5.4.2 5.4.3 5.4.4 5.4.5 6 6.1 6.2 6.2.1 6.2.2 6.2.3 6.3 6
7、.3.1 6.3.2 6.3.3 6.3.4 6.4 6.4.1 6.4.2 6.4.3 6.4.4 7 Scope 5 References . .5 . 6 . 6 . 6 Overview . .7 User plane .8 . 8 . 9 Primitive types . 9 Parameter definttions . 9 Interface to the Ethernet Layer . . 10 Interface to the Common Part . . 10 Functionality . . 10 General . 10 Coding of the Ethern
8、et SSCS PDU . . 11 Procedures . 12 General . 12 Procedures at the sender - Access Point . 12 Procedures at the sender - Mobile Terminal . . 14 Procedures at the receiver - Access Point 14 Procedures at the receiver - Mobile Terminal 15 Control Plane . .15 . 15 Convergence Layer specific parameters 1
9、6 Convergence Layer Identifier 16 Convergence Layer Version 16 Maximum Transmission Unit 16 Information Elements for Ethernet SSCS 16 Information element format . 16 Information element type coding . 17 IEEE 802 MAC Address IE . 17 AP Network Address IE . . 17 Procedures . 19 Association . . 19 Netw
10、ork Handover .20 Multicast . . 20 Miscellaneous . . 21 Definitions, symbols and abbreviations .6 General Primitiv . General Ethemet SSCS MIB . 21 Annex A (normative): Annex B (informative): Annex C (informative): Annex D (informative): Numbering and Coding Conventions . 22 Association procedure for
11、Ethernet SSCS . 23 Example of the MAC-ID table . 27 Bibliography . 28 History . .29 ETSI 4 ETSI TS 101 493-2 V1.2.1 (2001-12) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPR
12、s, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 314: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are avail
13、able on the ETSI Web server (htttwp :l;webawpiwi .c tsi .ordIPR/honie. am). 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 O00 3 14 (or the updates on the E
14、TSI 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 Project Broadband Radio Access Networks (BRAN). It defies the functionality required for interworking HIgh PErformance Radio Local Area Network
15、 Type 2 (HIPERLAN/2) with IEEE 802.3 Local Area Networks 5. Separate ETSI documents provide details on the system overview, data link control layer, radio link control sublayer, other convergence sublayers and conformance testing requirements for HIPERLAN/2. The Packet based Convergence Layer is spl
16、it into two parts, a Common Part and a Service Specific Part. The Common Part describes the functionality for adapting variable length packets/frames to the fixed size data units used at the Data Link Control (DLC) layer while the Service Specific part describes the functionality required to support
17、 a certain protocol, e.g. Ethernet or IP. It is envisioned that several, independent, Service Specific Convergence Sublayers (SSCS) will be defiied in the future as market requirements develop. The SSCSs all use the services of the Common Part and the DLC. The present document is part 2 of a multi-p
18、art deliverable covering the Packet based Convergence Layer, as identified below: Part 1 : “Common Part“; Part 2: Part 3: Part 4: Part 5: “Ethernet Service Specific Convergence Sublayer (SSCS)“; IEEE 1394 Service Specific Convergence Sublayer (SSCS)“; “IEEE 1394 Bridge Specific Functions sub-layer f
19、or restricted topology“; “IEEE 1394 Bridge Specific Functions sub-layer for unrestricted topology“. Part 1 describes the functionality for adapting variable length packets/frames to the fixed size used in the Data Link Control (DLC) layer. Further parts, each defining a Service Specific Convergence
20、Sublayer (SSCS), describe the functionality required to support a certain protocol, e.g. IEEE 1394 7 or Ethernet protocols. The SSCSs all use the services of the Common Part and the DLC 2. It is envisioned that several, independent, service specific parts will be defiied in the future as market requ
21、irements develop. As a result, further parts may be added in the future. ETSI 5 ETSI TS 101 493-2 V1.2.1 (2001-12) 1 Scope The present document is applicable to HIPERLAN/2 equipment supporting interworking with IEEE 802.3 Local Area Networks 5. The present document does only address the functionalit
22、y required to transfer IEEE 802.3 5 frames over the radio interface between an HIPERLAN/2 Access Point and Mobile Terminal. Note that the frame type described in IEEE 802.3 5, also covers Ethernet v2 (see bibliography). The present document does not address the requirements and technical characteris
23、tics for wired network interfaces at the Access Point and at the Mobile Terminal. The present document supports both best effort and the IEEE 802.1 priority mechanisms developed to enable Quality-of-Service in LANs. The present document uses the services provided by the Common Part of the Packet bas
24、ed Convergence Layer and by the Data Link Control layer of HIPERLAN/2. The present document does not address the requirements and technical characteristics for conformance testing. Those are covered in separate documents. 2 Re fe re nces The following documents contain provisions which, through refe
25、rence in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version
26、applies. il ETSI TS 101 493-1 (Vl.l.1): “Broadband Radio AccessNetworks (BRAN); HIPERLAN Type 2; Packet based Convergence Layer; Part 1 : Common Part“. ETSI TS 101 761-2: “Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) layer; Part 2: Radio Link Control (RLC) sublaye
27、r“. ETSI TS 101 761-1: “Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) Layer; Part 1 : Basic Data Transport Functions“. ISO/IEC 15802-3 (1998) ANSUIEEE Std 802. lD, 1998 Edition: “Information technology - Telecommunications and information exchange between systems -
28、 Local and metropolitan area networks - Common specifications - Part 3: Media Access Control (MAC) Bridges“. IEEE 802.3 (1 998): “Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sens
29、e multiple access with collision detection (CSMMCD) access method and physical layer specifications“. 21 31 41 51 IEEE 802.3ac (1 998): “Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carri
30、er sense multiple access with collision detection (CSMA/CD) frame extensions for Virtual Bridged Local Area Networks (VLAN) tagging on 802.3 networks“. IEEE 1394 (1995): “Standard for a High Performance Serial Bus“. RFC 791 (1981): “Internet Protocol“. RFC 2373 (1998): “IP Version 6 Addressing Archi
31、tecture“, R. Hinden, S. Deering“. ETSI 6 ETSI TS 101 493-2 V1.2.1 (2001-12) 3 Definitions, symbols and abbreviations 3.1 De fi nit ions For the purposes of the present document, the following terms and definitions apply: Maximum Transmission Unit (MTU): maximum packet size in octets that can be conv
32、eyed in one piece over a link Protocol Data Unit (PDU): data unit exchanged between entities at the same IS0 layer Service Data Unit (SDU): data unit exchanged between adjacent IS0 layers 3.2 Symbols For the purposes of the present document, the following symbol applies: ox Hexadecimal notation 3.3
33、Abbreviations For the purposes of the present document, the following abbreviations apply: AP BRAN CL CPCS C-SAP DLC DLCC DUC HIPERLAN/2 H/2 IE IEEE IP IPv4 IPv6 LAN LLC LSB M-SAP MAC MSB MT MTU PDU QOS RLC RFC SAP SDU SFD sscs TCI TCP TPID UDP Access Point Broadband Radio Access Networks (Project)
34、Convergence Layer Common Part Convergence Sublayer Control Service Access Point Data Link Control DLC Connection DLC User Connection High Performance Radio Local Area Network Type 2 see HIPERLAN/2 Information Element Institute of Electrical and Electronics Engineers Internet Protocol IP version 4 IP
35、 version 6 Local Area Network Logical Link Control Least Significant Bit MAC Service Access Point Medium Access Control Most Significant Bit Mobile Terminal Maximum Transmission Unit Protocol Data Unit Quality of Service Radio Link Control Request For Comments Service Access Point Service Data Unit
36、Start Frame Delimiter Service Specific Convergence Sublayer Tag Control Information field Transmission Control Protocol Tag Protocol Identifier User Datagram Protocol ETSI 7 ETSI TS 101 493-2 V1.2.1 (2001-12) 4 Overview The Ethernet Service Specific Convergence Sublayer is a part of the Packet based
37、 Convergence Layer and it resides on top of the Common Part and the DLC. It provides a method of using and preserving the IEEE 802.3 frame format over the radio interface by adapting service requests for transmission and reception of 802.3 frames to bearer services offered by the DLC. All Mobile Ter
38、minals (MT), associated to the same AP, appear like connected to one common fixed shared medium LAN segment. In contrast to a normal fixed LAN segment where all terminals are able to listen to all traffic on the segment, traffic that is originated by one MT is always first sent up to the AP. It is t
39、hen the task of the AP to relay the traffic to either the fixed network andor to other MTs associated to that AP. The network topology when applied to HIPERLAN/2 is shown in figure 4.1. Please note that the scope of the Ethernet SSCS is limited to the radio interface only (shaded in grey). The archi
40、tecture of the AP, e.g. if it only contains Layer 2 (i.e. MAC bridging) functionality or if it also includes Layer 3 (i.e. IP routing) functionality, is not standardized. Local Area Network I H/2Access Point I I I I I ! ! I I I I I I ! ! ! Figure 4.1: HIPERLAN12 network topology using Ethernet SSCS
41、The corresponding protocol model for Ethernet SSCS is depicted in figure 4.2. The Ethernet SSCS replaces the MAC entity in the IEEE 802 model. At the MT, the CL User Service Access Point is mapped to the M-SAP, the SAP between IEEE 802.2 (LLC) and the IEEE 802.3 (MAC) layers. At the AP, the Ethernet
42、 SSCS replaces the IEEE 802.3 MAC entity and interacts with the MAC relay entity of an IEEE 802.1D bridge. ETSI 8 ETSI TS 101 493-2 V1.2.1 (2001-12) Application E.g. TCP/UDP E.g. IP Ethernet V2 or IEEE 802.3 / 802.2 framing 0 scope of BRAN specifications HIP ERLANIP Mobile Termi na1 HIPERLANIP Acces
43、s Point Figure 4.2: Ethernet SSCS architecture applied to HIPERLAN12 The Ethernet SSCS supports two Quality-of-Service types: a) Best Effort This is the default QoS type that shall be supported. All traffic is treated equally and no Quality-of-Service guarantees can be provided. b) IEEE 802.1 priori
44、ty based QoS scheme IEEE 802. lp provides priority mechanisms to enable Quality-of-Service in Local Area Networks. These mechanisms have been incorporated into IEEE 802.1D 4. Eight (numbered 0-7) different priority levels are defined. The user priorities are mapped one-to-one or many-to-one to queue
45、s, depending on the number of queues supported. In HIPERLAN/2 each queue corresponds to one DLC user connection. The mapping between user priorities and DLC user connections is defined in clause 5.4.2. The user priority information is carried in each IEEE 802.3 frame using a Tag Header inserted foll
46、owing the source and destination address. The Tag Header is defined in 6 (see clause 5.3.2 for more details on supported frame types). The support for IEEE 802.1 is optional for both the MT and AP. The Quality-of-Service type and additional parameters used by the SSCS are negotiated at association t
47、ime using the control plane procedures defiied in clause 6. The Ethernet SSCS consists of a user plane and a control plane. The user plane, described in clause 5, provides services to the Higher Layer via the CL-Service Access Point (SAP) and uses the services of the Common Part of the Packet based
48、Convergence Layer i. The control plane of the Ethernet SSCS, described in clause 6, interacts with the DLC control plane, i.e. the RLC sublayer, via the DLC Control SAP. The DLC Control SAP is defined in 2. 5 5.1 User plane General The user plane procedures of the Ethernet SSCS provide the capabilit
49、y to transfer Ethernet SSCS SDUs between the Ethernet SSCS of the AP and one or more Ethernet SSCSs of MTs over the HIPERLAN/2 network. It is the task of the Ethernet SSCS to map the address and priority scheme of the Higher Layer to the address and priority scheme of the DLC layer. Ethernet SSCS SDUs coming from the Higher Layer are mapped onto different DLC user connections, depending on the Ethernet destination address and priority. The relation between Ethernet addresdpriority and DLC user connections is managed by the Ethernet SSCS control pla
