1、ETSI TS 101 763-1 1.1.1 (2000-04) Technical Specification Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Cell based Convergence Layer Part 1: Common Part 2 ETSI TS 1 O1 763-1 V1.l.l (2000-04) The pre ent d Reference DTS/BRAN-0024003-1 Keywords HIPERLAN, broadband, radio, ATM, access ETSI 6
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6、nications Standards Institute 2000. All rights reserved. ETSI 3 ETSI TS 1 O1 763-1 V1.l.l (2000-04) Contents Intellectual Property Rights 4 Foreword 4 1 Scope 5 2 References 5 3 Definitions and abbreviations 6 3.1 Definitions 6 3.2 Abbreviations . 6 4 5 Convergence Layer architecture 7 Cell based Co
7、nvergence Layer . 7 5.1 5.2 5.2.1 5.2.2 5.3 5.3.1 5.3.2 5.3.3 5.3.3.1 5.3.3.2 5.3.3.3 5.4 5.5 5.5.1 5.5.2 5.5.3 5.5.4 General . 7 Primitives (informative) . 8 Primitive types 8 Parameter definitions 9 Common Part Convergence Sublayer . 9 Functional Model 9 Primitives at the CL-User SAP . 9 Procedure
8、s 10 General 10 Procedures at the receiver . 10 Interface to the DLC . 10 Functionality . 10 General 10 Rules for connection mapping 11 Coding of the CPCS-PDU 11 Mapping 12 Procedures at the sender 10 6 7 Convergence Layer Version . 12 Common Part - MIB . 12 Annex A (normative): Annex B (informative
9、): Numbering and Coding Conventions 13 ATM-cell format 14 Annex C (informative): Annex D (informative): Mapping Table Example . 15 SDL Diagrams 17 D.l CPCS Sender 17 Bibliography . 19 History 20 D.2 CPCS Receiver . 18 ETSI 4 ETSI TS 1 O1 763-1 V1.l.l (2000-04) Intellectual Property Rights IPRs essen
10、tial 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 SR O00 3 14: “Intellectual Propero Rights (IPRs); Essential, or potentially Es
11、sential, IPRs notifed to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.org/ipr). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarant
12、ee can be given as to the existence of other IPRs not referenced in SR O00 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 Specification (TS) has been produced by ETSI Project Broadband Radio Access Networks
13、(BRAN). The present document defines the functionality required for the support of cell based services (ATM) over HIgh PErformance Radio Local Area Network Type 2 (HIPERLANl2) 4. Separate ETSI documents provide details on the system overview, physical layer, data link control layer, other convergenc
14、e sublayers and conformance testing requirements for HIPERLANl2. The Cell based Convergence Layer is split into several parts. Part 1, Common Part, describes the functionality for mapping ATM cells into data units used at the Data Link Control (DLC) layer. Further parts, each defining a Service Spec
15、ific Convergence Sublayer (SSCS), describe the control plane functionality required to support a specific signalling protocol, e.g. ATMFs M-UNI protocol (see Bibliography). It is envisioned that several, independent, service specific parts will be added as market requirements develop in the future.
16、The present document is part 1 of a multi-part TS covering the HIPERLAN Type 2; Cell based Convergence Layer, as identified below: Part 1: “Common part“; Part 2: “ATM-UNI Service Specific Part“. Further parts will be added in the future. ETSI 5 ETSI TS 1 O1 763-1 V1.l.l (2000-04) 1 Scope The present
17、 document describes the basic transport of ATM cell streams via HIPERLAN/2. The mapping between ATM cells and HIPERLAN/2 DLC PDUs is specified. The present document is applicable to HIPERLAN/2 equipment supporting ATM cell transport. The present document does only address the functionality required
18、to transfer ATM cells over the radio interface between a HIPERLAN/2 Access Point and Mobile Terminal. It does not address the requirements and technical characteristics for wired network interfaces at the Access Point and at the Mobile Terminal. The Cell based Convergence Layer consists of a Common
19、Part Convergence Sublayer, defined in the present document, and several Service Specific Convergence Sublayers (SSCS), which are defined in separate documents. The Service Specific Convergence Sublayers all use services provided by the Common Part Convergence Sublayer and the HIPERLAN/2 Data Link Co
20、ntrol (DLC) layer. The present document does not address the requirements and technical characteristics for type approval and conformance testing. These are covered by separate documents. 2 References The following documents contain provisions which, through reference in this text, constitute provis
21、ions 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. A non-specific reference to a
22、n ETS shall also be taken to refer to later versions published as an EN with the same number. il ETSI TS 101 761-1: “Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) Layer; Part 1: Basic Data Transport Functions“. ETSI TS 101 761-2: “Broadband Radio Access Networks (B
23、RAN); HIPERLAN Type 2; Data Link Control (DLC) Layer; Part 2: Radio Link Control Protocol Basic Functions“. ITU-T Recommendation 1.36 1: “B-ISDN ATM layer specification“. ETSI TR 101 378: “Broadband Radio Access Networks (BRAN); Common ETSI -ATM Forum reference model for Wireless ATM Access Systems
24、(WACS)“. IETF RFC 1577: “Classical IP and ARP over ATM“. Pl 31 41 51 61 ATM Forum (af-lane-0084.000): “LAN Emulation over ATM Version 2 - LUNI Specification“ ETSI 6 ETSI TS 1 O1 763-1 V1.l.l (2000-04) 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the follo
25、wing terms and definitions apply: HPERLAN/2: HIgh PErformance Radio Local Area Network Type 2, a short-range wireless LAN providing broadband local access. Standardized by ETSI Project BRAN Protocol Data Unit (PDU): data unit exchanged between entities at the same IS0 layer Service Data Unit (SDU):
26、data unit exchanged between adjacent IS0 layers 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AP ATM BRAN CL CLP CPCS DLC DLCC DUC GFC HEC LAN LANE LSB MIB MSB MT OAM PDU PT PTI SAP SDU sscs UNI M-UNI u-SAP vc VCI VP VPI Access Point Asynchronous Tran
27、sfer Mode Broadband Radio Access Networks (Project) Convergence Layer Cell Loss Priority Common Part Convergence Sublayer Data Link Control DLC Connection DLC User Connection Generic Flow Control Header Error Control Local Area Metwork LAN emulation Least Significant Bit Management Information Base
28、Most significant Bit Mobile Terminal Operation and Management Protocol Data Unit Payload Type Payload Type Identifier Service Access Point Service Data Unit Service Specific Convergence Sublayer User Network Interface User Network Interface + Mobility Extension User Service Access Point Virtual Chan
29、nel Virtual Channel Identifier Virtual Path Virtual Path Identifier ETSI 7 ETSI TS 1 O1 763-1 V1.l.l (2000-04) 4 Convergence Layer arch i tect u re The Convergence Layer (CL) resides on top of the Data Link Control (DLC) layer. The task of the Convergence Layer is to adapt the service requirements o
30、f different Higher Layers to the services offered by the HIPERLAN/2 DLC layer. Two Convergence Layers can be distinguished in BRAN, a Cell based Convergence Layer and a Packet based Convergence Layer (see figure 4.1). Further Convergence Layers may be specified in the future. The Cell based Converge
31、nce Layer offers services to Higher Layers that use the fixed size ATM cell as the transfer unit. The Packet based Convergence Layer offers services to Higher Layers that use packets or frames of variable size or fixed size which exceed the ATM cell size. Typical examples of these are Ethernet and t
32、he Internet protocol suite. Higher Layers . . . . Convergence Layers Figure 4.1 : HIPERLANR Convergence Layers 5 5.1 Cell based Convergence Layer General The Cell based Convergence Layer provides the capability to transfer User Service Data Units (User SDUs), that correspond to an ATM cell, transpar
33、ently between users of the Convergence Layer. The Cell based CL itself consists of two parts, a Common Part Convergence Sublayer (CPCS) and a Service Specific Convergence Sublayer (SSCS). It is intended that several different Service Specific Convergence Sublayers will be specified within BRAN. An A
34、ccess Point may support several SSCSs simultaneously. The CPCS describes the user plane functionality, i.e. how the information contained in an ATM cell is mapped into a HIPERLAN/2 DLC transport unit (SDU) and vice versa. The Convergence Layer performs the adaptation between the User SDU and the DLC
35、-SDU. User SDUs belonging to different ATM connections can be multiplexed on one DLC connection. Multiple DLC connections can be set up. The SSCS defines the mapping of Control Plane procedures for connection and mobility management between HIPERLAN/2 and the ATM specific control plane. ETSI 8 ETSI
36、TS 1 O1 763-1 V1.l.l (2000-04) Figure 5.1 : Protocol profile for Cell based Convergence Layer on Native ATM (scope of HIPERLANR specifications shaded in grey) Figure 5.1 shows a protocol profile for the Cell based Convergence Layer that uses Native ATM for basic data transport. The application inter
37、faces with the ATM user plane comprising of AAL5 and ATM layer and the ATM control plane using the UNI signalling protocols. User plane and control plane data are encapsulated into AAL5 frames, which are segmented into ATM cells for further transport. The Common Part Convergence Sublayer of the Cell
38、 based CL adapts the ATM cell format to the DLC-SDU of H/2. The ATM control plane functionality, like connection control and mobility management, is handled by the UNI signalling protocols. The UNI Service Specific Part of the Cell based CL translates UNI control plane functions into the correspondi
39、ng H/2 control plane functions. Other protocol profiles containing Classical IP over ATM 5 or LAN emulation (LANE) 6 enable to run the TCP/IP protocol suite over ATM. To provide interoperability, the protocol profile and the capabilities of the network are signalled between MT and AP upon associatio
40、n. 5.2 Primi tives (informative) The Common Part Convergence Sublayer exchanges service primitives with the Higher Layer and the DLC. NOTE: The primitives are defined only for the purpose of describing layer-to-layer and sublayer-to-sublayer interactions. These primitives are defined as an abstract
41、list of parameters, and their concrete realization may vary between implementations. No formal testing of primitives is intended. The following primitive definitions have no normative significance. 5.2.1 Primitive types Interface between layers Four primitive types may be used between different laye
42、rs: - req (request), for a higher layer to request service from a lower layer; - cnf (confirm), for the layer providing the service to confirm the activity has been completed; - ind (indication), for a layer providing service to notify the next higher layer of any specific service related activity;
43、- rsp (response), for a layer to acknowledge receipt of an indication primitive from the next lower layer. ETSI 9 PARAMETER ETSI TS 1 O1 763-1 V1.l.l (2000-04) Rea Ind 5.2.2 Parameter definitions ., Payload data Endpoint identifiers: some primitives contain an endpoint identifier. This identifier sh
44、all be used to distinguish primitives related to different protocol instances. As identifier the DLC User Connection ID (DUC-ID), which is the concatenation of a MAC-ID and DLCC-ID i, shall be used. The coding of this identifier is a local matter and not defined in the present document. The identifi
45、er is defined as: DLC User Connection ID (DUC-ID) Message unit: each piece of higher layer information that is included in the primitive is called a message unit. A series of one or more message units may be associated with each primitive where each separate unit is related to one information elemen
46、t in the corresponding DLC layer message. The list of message units is derived from the message definitions by reference to the information elements that may contain information from or to the CL. A A 5.3 Common Part Convergence Sublayer 5.3.1 Functional Model The Higher Layer exchanges CL-SDUs (whi
47、ch correspond to an ATM cell) with the Cell based Convergence Layer. Upon transmission the Cell based Convergence Layer maps the ATM payload and header information into a DLC-SDU, which is subsequently passed to the HIPERLAN/2 DLC layer for transmission to the peer-entity. Upon reception a DLC-SDU i
48、s passed to the Cell based Convergence Layer where a CL-SDU is reconstructed and passed to the Higher Layer. The DLC User SAP forms the logical interface between those two layers. Figure 5.2 shows the primitives at CL-User SAP and the DLC User SAP that are used for further reference. Higher Layers C
49、L-U NITDATA-req I + CL-UNITDATA-ind CLUSAP. I I Interface to SSCS , Not specified : DLC-UNITDATA-req DLC-UNITDATA-ind DLC Layer Figure 5.2: Cell based Convergence Layer User Plane model 5.3.2 Primitives at the CL-User SAP The following primitives are used: CL-UNITDATA req, ind Message units (possible elements) Virtual Path Identifier (VPI) Virtual Channel Identifier (VCI) Cell Loss Priority (CLP) Pavload Tvpe (PT) A A A A A A A A Virtual Path Identifier (VPI): this parameter specifies an 8 bit Virtual Path Identifier. ETSI 10 ETSI TS 1 O1 763-1 V1.l.l (2000-04)
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