1、ETS I TS 1 02 1 1 5- 1 VI .I .I (2002-09) Technical Specificafion Broadband Radio Access Networks (BRAN); HIPERACCESS; Cell based Convergence Layer; Part 1: Common Part 2 ETSI TS 102 115-1 V1.l.l (2002-09) Reference DTSIBRAN-0034003-1 Keywords access, ATM, broadband, HIPERACCESS, radio ETSI 650 Rout
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6、ia. O European Telecommunications Standards Institute 2002. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a
7、 Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI TS 102 115-1 V1.l.l (2002-09) Contents Intellectual Property Rights 4 Foreword . 4 1 2 3 3.1 3.2 4 5 5.1 5.2 5.2.1 5.3 5.3.1 5.3.2 5.3.3 Scope 5 References 5 Definitions and abbreviatio
8、ns . 5 . 5 . 5 Convergence Layer architecture . 6 Cell based Convergence Layer . 6 . 6 . 7 7 e Sublayer . . 8 Functional Model . 8 Primitives . 8 Procedures . . 9 . 5.3.3.1 General . 9 5.3.3.2 Procedures at the receiver . . 9 5.3.3.3 Procedures at the sender . 9 . 9 5.4 Functionality . . 9 5.5 5.5.1
9、 General . 9 5.5.2 Rules for connection mapping . 9 5.5.3 Coding ofthe CPCS-PDU 10 Interface to the DLC . Annex A (normative): Numbering and Coding Conventions . 11 Annex B (informative): ATM-cell format 12 Annex C (informative): Mapping Table Example . 13 Annex D (informative): SDL Diagrams 14 D.l
10、CPCS Sender 14 D.2 CPCS Receiver . 15 Annex E (informative): Bibliography . 16 History 17 ETSI 4 ETSI TS 102 115-1 V1.l.l (2002-09) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essenti
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13、 or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Project Broadband Radio Access Networks (BRAN). The present document defines the functionality required for the support of cell based services (ATM) over HIgh PErformance Radio Loc
14、al Area Network Type 2 (HIPERACCESS) 3. Separate ETSI documents provide details on the system overview, physical layer, data link control layer, other convergence sublayers and conformance testing requirements for HIPERACCESS. The Cell based Convergence Layer is split into several parts. Part 1, Com
15、mon Part, describes the functionality for mapping ATM cells into data units used at the Data Link Control (DLC) layer i. Further parts, each defining a Service Specific Convergence Sublayer (SSCS), describe the control plane functionality required to support a specific signalling protocol, e.g. ATMF
16、s M-UNI protocol (see annex E). It is envisioned that several, independent, service specific parts will be added as market requirements develop in the future. The present document is part 1 of a multi-part deliverable covering the HIPERACCESS; Cell based Convergence Layer, as identified below: Part
17、1: “Common part“; Part 2: “UNI Service Specific Convergence Sublayer (SSCS)“. Further parts may be added in the future. ETSI 5 ETSI TS 102 115-1 V1.l.l (2002-09) 1 Scope The present document describes the basic transport of ATM cell streams via HIPERACCESS. The mapping between ATM cells and HIPERACC
18、ESS DLC PDUs is specified. The present document does only address the functionality required to transfer ATM cells over the radio interface between a HIPERACCESS Access Point and Access Terminal. It does not address the requirements and technical characteristics for wired network interfaces at the A
19、ccess Point and at the Access Terminal. The Cell based Convergence Layer consists of a Common 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
20、 use services provided by the Common Part Convergence Sublayer and the HIPERACCESS Data Link Control (DLC) layer i. The present document does not address the requirements and technical characteristics for conformance testing. These are covered by separate documents. 2 Re fe re nces The following doc
21、uments contain provisions which, through reference 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
22、a non-specific reference, the latest version applies. il ETSI TS 102 000: “Broadband Radio Access Networks (BRAN); HIPERACCESS; DLC protocol specification“. ITU-T Recommendation 1.361: “B-ISDN ATM layer specification“. ETSI TR 101 378: “Broadband Radio Access Networks (BRAN); Common ETSI -ATM Forum
23、reference model for Wireless ATM Access Systems (WACS)“. 21 31 3 3.1 Definitions and abbreviations De fi nit ions For the purposes of the present document, the following terms and definitions apply: Protocol Data Unit (PDU): data unit exchanged between entities at the same IS0 layer Service Data Uni
24、t (SDU): data unit exchanged between adjacent IS0 layers 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AP Access Point AT Access Terminal ATM Asynchronous Transfer Mode CL Convergence Layer CLP Cell Loss Priority ETSI 6 ETSI TS 102 115-1 V1.l.l (2002-
25、09) CPCS DLC GFC HA HEC LAN LSB MSB “I OAM PDU PTI SDU sscs UNI M-UNI vc VCI VP VPI Common Part Convergence Sublayer Data Link Control Generic Flow Control HiperAccess Header Error Control Local Area Network Least Significant Bit Most Significant Bit Network Node Interface Operation And Management P
26、rotocol Data Unit Payload Type Identifier Service Data Unit Service Specific Convergence Sublayer User Network Interface User Network Interface + Mobility Extension Virtual Channel Virtual Channel Identifier Virtual Path Virtual Path Identifier 4 Convergence Layer architecture The Convergence Layer
27、(CL) resides on top of the Data Link Control (DLC) layer. The task of this Convergence Layer is to adapt the service requirements of ATM to the services offered by the HIPERACCESS DLC layer. c Higher Layers f .e f T T Convergence Layers Figure 4.1 : HIPERACCESS Convergence Layers 5 Cell based Conver
28、gence Layer 5.1 Gen eral The Cell based Convergence Layer provides the capability to transfer User Service Data Units (User SDUs), that correspond to an ATM cell, transparently between users of the Convergence Layer. The Cell based CL itself consists of two parts, a Common Part Convergence Sublayer
29、(CPCS) and a Service Specific Convergence Sublayer (SSCS). It is intended that several different Service Specific Convergence Sublayers will be specified within BRAN. An Access Point may support several SSCSs simultaneously. The CPCS describes the user plane functionality, i.e. how the information c
30、ontained in an ATM cell is mapped into a HIPERACCESS DLC transport unit (SDU) and vice versa. The Convergence Layer performs the adaptation between the User SDU and the DLC-SDU. ETSI 7 ETSI TS 102 115-1 V1.l.l (2002-09) The SSCS defines the mapping of Control Plane procedures for connection between
31、HIPERACCESS and the ATM specific control plane. Applications ILVI UNI signalling ATM I Figure 5.1: Protocol profile for Cell based Convergence Layer on ATM data transport (scope of HIPERACCESS specifications shaded in grey) Figure 5.1 shows a protocol profile for the Cell based Convergence Layer tha
32、t uses ATM for basic data transport. The application interfaces with the ATM user plane comprising of ATM AAL, ATM layer and the ATM control plane using the UNI signalling protocols. If needed, UNI signalling messages are encapsulated into AAL5 frames, which are segmented into ATM cells for further
33、transport. The Common Part Convergence Sublayer of the Cell based CL adapts the ATM cell format to the DLC-SDU of HA. The ATM control plane functionality, like connection control, is handled by the UNI signalling protocols. The UNI Service Specific Part of the Cell based CL translates UNI control pl
34、ane functions into the corresponding HA control plane functions. 5.2 Prim i 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-subl
35、ayer interactions. These primitives are defined as an abstract 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
36、 layers Four primitive types may be used between different layers: -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 notiSl the
37、next higher layer of any specific service related activity; -rsp (response), for a layer to acknowledge receipt of an indication primitive from the next lower layer. ETSI 8 ETSI TS 102 115-1 V1.l.l (2002-09) PARAMETER Message units (possible elements) Virtual Path Identifier (VPI) Virtual Channel Id
38、entifier (VCI) Cell Loss Priority (CLP) Payload Type Identifier (PTI) Payload data 5.3 Req Ind A A A A A A A A A A Common Part Convergence Sublayer 5.3.1 Functional Model The Higher Layer exchanges CL-SDUs (which correspond to ATM cells) with the Cell based Convergence Layer. Upon transmission the C
39、ell based Convergence Layer shall map the ATM payload and header information into a DLC-SDU, which shall be subsequently passed to the HIPERACCESS DLC layer for transmission to the peer-entity. Upon reception a DLC-SDU shall be passed to the Cell based Convergence Layer where a CL-SDU is reconstruct
40、ed and passed to the Higher Layer. Figure 5.2 shows the primitives between CL and Higher Level and primitives between CL and DLC layer that are used for further reference. Higher Layers CLData-ind T CLData-req Interface to SSCS Not specified CPCS - PDU to peer entity 4- - - - - - - - - DLC Layer Fig
41、ure 5.2: Cell based Convergence Layer User Plane model 5.3.2 Primitives The following primitives are used: CLData req, ind Virtual Path Identifier PPI): this parameter specifies an 8 bit Virtual Path Identifier in case of UNI or a 12 bit Virtual Path Identifier in case of “I. Virtual Channel Identif
42、ier PCI): this parameter specifies a 16 bit Virtual Channel Identifier as it is defined in 2 Cell Loss Priority (CLP): this 1 bit parameter specifies the cell loss priority as it is defined in 2. Payload Type Identifier (PTI): this parameter specifies a 3-bit payload type as it is defined in 2. Payl
43、oad data: the 48 octet user data. The above mentioned parameters are defined for an ATM cell, see also annex B. The ATM GFC field has only local meanings and it needs not to be transmitted over the air interface. ETSI 9 ETSI TS 102 115-1 V1.l.l (2002-09) 5.3.3 P roced u res 5.3.3.1 Gen era I The pro
44、cedures defied in the following clauses are symmetric with respect to the direction. The description is valid for both the AT and the AP. 5.3.3.2 Procedures at the receiver The receiver maintains the mapping between CID and the ATM connection identifiers (VPI, VCI) for each active DLC connection. Th
45、e ATM VCI field is always transparently carried by CPCS-PDU. The SSCS shall configure the mapping for each ATM connection. A CLData indication primitive shall be formed and passed to the Higher Layer once a CPCS-PDU is received from the peer-entity . A received CPCS-PDU with a non-configured mapping
46、 for the CID and the VCI field of the CPCS-PDU shall be discarded. The CL expects an in-sequence data transfer service from the DLC. The format of the CPCS-PDU is shown in figure 5.3. 5.3.3.3 Procedures at the sender The sender maintains the mapping between the ATM connection identifiers (VPI, VCI)
47、and CID for each active CID. The ATM VCI field is always transparently carried by CPCS-PDU. The SSCS shall configure the mapping for each ATM connection. The service user invokes the transmission service with a CLData request primitive. A CPCS-PDU is constructed as described in clause 5.5.3 and pass
48、ed within a DlcData request primitive to the DLC layer. A CPCS-PDU shall only be constructed and passed to the DLC layer as part of the CLData request primitive if the mapping for the VPI, VCI exists. 5.4 Interface to the DLC The DLC primitives are specified in the DLC specification i. The CL expect
49、s an in-sequence delivery data transfer service from the DLC. The format of the CPCS-PDU (which is equivalent to the DLC-SDU) is shown in figure 5.3. 5.5 Fu nct ion al i ty 5.5.1 General The CPCS functions are performed per CPCS-PDU. The function implemented by the CPCS comprises the transfer of User-data. This function is used for the conveyance of fixed length user data between users of the Convergence Layer. 5.5.2 Rules for connection mapping The following rules apply: 1) VCI, PTI and CLP fields from a CLData request primitive shall be copied into the correspondi
