1、 ANSI/TIA-136-333-2000 APPROVED: MARCH 31, 2000 REAFFIRMED: OCTOBER 20, 2004 REAFFIRMED: AUGUST 14, 2013 WITHDRAWN: JUNE 12, 2015 TIA-136-333 March 2000TDMA Third Generation Wireless- Packet Data Service- Logical Link Control NOTICE TIA Engineering Standards and Publications are designed to serve th
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20、36 - 333 specifies the Logical Link Control (LLC) for packet - data servic e (GPRS - 136). The LLC is used for packet - data transfer between the Mobile Station (MS) and the Serving GPRS Support Node (SGSN). LLC is intended for use with both acknowledged and unacknowledged data transfer. TIA/EIA - 1
21、36 - 333 was developed by TR45.3.2, the Data Services Working Group of TR45 - 3, the TIA/EIA TDMA Wireless Standards Subcommittee . This document references publications developed by ETSI (European Telecommunications Standards Institute). These referenced publications are freely available at http:/w
22、ww.etsi.org . TIA welcomes suggestions for improvement of this standard. Please send suggestions to the following address: Telecommunications Industry Association 2500 Wilson Boulevard - Suite 300 Arlington VA 22201 - 383 6 TIA/EIA - 136 - 333 iiTHIS PAGE INTENTIONALLY LEFT BLANK TIA/EIA - 136 - 33
23、3 iiiContents 1. Scope 1 2. Definitions and abbreviations 1 3. Overview description of LLC functions and procedures 2 3.1 Reference model 2 3.2 General description of the LLC protocol 3 3.3 Unacknowledged operation 3 3.4 Acknowledged operation . 3 3.5 Establishment of information transfer modes . 3
24、3.6 Data confidentiality . 3 3.7 LLC layer structure 4 3.7.1 Logical Link Entity . 4 3.7.2 Multiplex procedure 4 3.7.3 Logical Link Management . 5 3.8 GPRS Mobility Management . 5 3.9 Short Message Service . 5 3.10 Tunnelling Of Messages 5 4. Frame structure . 6 5. Elements of procedures and formats
25、 of fields . 7 5.1 General 7 5.2 Address field format and variabl es . 7 5.2.1 Protocol Discriminator bit (PD) . 7 5.2.2 Command/Response bit (C/R) . 7 5.2.3 Service Access Point Identifier (SAPI) . 7 5.3 Contr ol field formats, parameters, and variables 8 5.4 Commands and responses 8 5.4.1 Unnumber
26、ed (U) frames 8 5.4.1.1 Set Asynchronous Balanced Mode (SABM) command 8 5.4.1.2 Disconnect (DISC) command 8 5.4.1.3 Unnumbered Acknowledgement (UA) response 9 5.4.1.4 Disconnected Mode (DM) response 9 5.4.1.5 Fram e Reject (FRMR) response . 9 5.4.1.6 Exchange Identification (XID) command/response 9
27、5.4.2 Unconfirmed Information (UI) frame 12 5.4.3 Combined Information (I) and Sup ervisory (S) frames . 12 6. Elements for layer - to - layer communication 13 6.1 Definition of service primitives and parameters . 13 6.1.1 Primitives types . 13 TIA/EIA - 136 - 333 iv6.1.2 Generic names . 14 6.2 Prim
28、itive procedures 15 7. Definition of the LLC peer - to - peer protocol . 16 8. References 17 An nex A: Ciphering 18 Annex B: Tunnelling of Messages (TOM) 19 B.1 TOM Protocol Envelope structure 19 B.1.1 TOM Protocol Discriminator . 20 B.1.2 Remaining Length of TOM Protocol Header 20 B.1.3 Remaining O
29、ctets of TOM Protocol Header . 20 B.1.4 Message Capsule 21 Annex C: LLC layer states for peer - to - peer operation 22 TIA/EIA - 136 - 33 3 vFigures Figure 1: Protocol layering in GPRS . 2 Figure 2: Functional model of the LLC Layer . 4 Figure 3: XID parameter field format . 10 TIA/EIA - 136 - 333 v
30、iTables Table 1: Allocation of SAPI values 8 Table 2: LLC layer parameter negotiation 11 Table 3: LLC layer service primitives . 14 Table 9: LLC layer parameter default values 16 Table 4 : TOM Protocol Envelope Format . 19 Table 5: TOM Protocol Discriminator 20 Tabl e 6: TOM Protocol Header Length 2
31、0 TIA/EIA - 136 - 33 3 viiRevision History Revison Description TIA/EIA - 136 - 333 First revision TIA/EIA - 136 - 333 viiiTHIS PAGE INTENTIONALLY LEFT BLANK TIA/EIA - 136 - 33 3 11. Scope 1 This section is the same as Section 1 of GSM 04.64 3. 2 2. Definitions and abbreviations 3 This section is the
32、 same as Section 3 of GSM 04.64. 4 TIA/EIA - 136 - 333 23. Overview description of LLC functions 1 and procedures 2 This section is the same as Section 4 of GSM 04.64. 3 3.1 Reference model 4 A model of layering the protocol s in GPRS is illustrated in Figure 1. 5 Figure 1 : Protocol layering in GPR
33、S 6 Um GbMS BSS SGSNSNDC SMSGMMLLCRLCMACGSM RFRelayRLCMACGSM RFBSSGPNetworkServiceL1SNDC SMSGMMLLCBSSGPNetworkServiceL1TOM TOM7 The LLC layer operates above the RLC and BSSGP layers in the reference architecture 8 to provide logical links between an MS and its SGSN. 9 Above the LLC lay er is located
34、 the SubNetwork Dependent Convergence (SNDC) layer, 10 that controls the transfer of user data network layer PDUs (N - PDUs) between the MS 11 and SGSN. The SNDC functionality is described in GSM 03.60 and specified in 12 TIA/EIA - 136 - 334 4. 13 The logical link control layer Service Access Points
35、 (SAPs) are the points at which the 14 LLC layer provides services to the layer -3 protocols in Figure 1. In addition to the 15 SNDC protocol, LLC provides service to the GPRS Mobility Management (GMM) 16 protocol, to the SMS protocol, and to the Tunnelling of Messages (TOM) protocol. 17 An LLC laye
36、r connection is identified by the DLCI consisting of the SAP Identifier 18 (SAPI) and the MSs Temporary Logical Link Identifier (TLLI). 19 Each LLC frame consists of the header, trailer, an d information field. The header and 20 trailer fields contain information such as SAPI, frame number and check
37、sum, that are 21 TIA/EIA - 136 - 33 3 3used to identify the frame and to provide reliable transmission. The information field is 1 variable length. Both transmission and retran smission of each frame are controlled by 2 the LLC layer. 3 Many of the formats and procedures are similar to the reference
38、 protocols, and 4 differences are introduced only where needed to reflect the unique aspects of the GPRS 5 architecture and requirements. 6 3.2 Gen eral description of the LLC protocol 7 This subsection is the same as subsection 4.2 of GSM 04.64. 8 3.3 Unacknowledged operation 9 This subsection is t
39、he same as subsection 4.3 of GSM 04.64. 10 3.4 Acknowledged operation 11 With this type of operation, layer - 3 information is transmitted in order in numbered 12 Information (I) frames. The I frames are acknowledged at the LLC layer. Error recovery 13 and reordering procedures based on retransmissi
40、on of unacknowledged I frames are 14 specified. Several I frames may be unacknowledged at the same time. In the case of 15 errors that cannot be corrected by the logical link control layer, a report to GPRS 16 mobility management shall be made. 17 Flow control procedures are defined. 18 Acknowledged
41、 operation requires that ABM operation has been initiated by an 19 establishment procedure using the Set Asynchronous Balanced Mode (SABM) 20 command. 21 Acknowledged operation is allowed for all SAPIs that are not reserved (see Table 1) 22 except SAPIs 1, 2, 7, and 8. 23 3.5 Establishment of inform
42、ation transfer modes 24 This subsec tion is the same as subsection 4.5 of GSM 04.64. 25 3.6 Data confidentiality 26 This subsection is the same as subsection 4.6 of GSM 04.64. 27 TIA/EIA - 136 - 333 43.7 LLC layer structure 1 The LLC layer structure is shown in Figure 2. This figure is a model shown
43、 for 2 illustrative purposes onl y, and does not constrain implementations. 3 Figure 2 : Functional model of the LLC Layer 4 LogicalLinkEntitySAPI=7LogicalLinkEntitySAPI=8SGSNMSGPRS Mobility ManagementLogicalLinkManagementEntityMultiplex ProcedureLL5 LL9LL3 LL11SNDCPLLGMMSMSLogicalLinkEntitySAPI=2MA
44、CLogicalLinkEntitySAPI=11LogicalLinkEntitySAPI=9LogicalLinkEntitySAPI=5LogicalLinkEntitySAPI=3LogicalLinkEntitySAPI=1GRRLLGMMRR layerLLC layerLayer 3LLC layerBSSGPBSSGPBSSGP layerSignallingSignalling and data transferTOMTOM8 LLSMSTOM23.7.1 Logical Link Entity 5 This subsection is the same as subsect
45、ion 4.7.1 of GSM 04.64. 6 3.7.2 Multiplex procedure 7 This subsect ion is the same as subsection 4.7.2 of GSM 04.64. 8 TIA/EIA - 136 - 33 3 53.7.3 Logical Link Management 1 This subsection is the same as subsection 4.7.3 of GSM 04.64. 2 3.8 GPRS Mobility Management 3 This subsection is the same as s
46、ubsection 4.8 of GSM 04.64. 4 3.9 Short Message Service 5 This subse ction is the same as subsection 4.9 of GSM 04.64. 6 3.10 Tunnelling Of Messages 7 TOM is a generic protocol layer used for the exchange of TOM Protocol Envelopes 8 between the MS and the SGSN. TOM procedures are defined in Annex B.
47、 9 TIA/EIA - 136 - 333 64. Frame structure 1 This section is th e same as section 5.0 of GSM 04.64. 2 TIA/EIA - 136 - 33 3 75. Elements of procedures and formats of 1 fields 2 This section is the same as section 6 of GSM 04.64. 3 5.1 General 4 This subsection is the same as subsection 6.1 of GSM 04.
48、64. 5 5.2 Address field format and variables 6 This subsection i s the same as subsection 6.2 of GSM 04.64. 7 5.2.1 Protocol Discriminator bit (PD) 8 This subsection is the same as subsection 6.2.1 of GSM 04.64. 9 5.2.2 Command/Response bit (C/R) 10 This subsection is the same as subsection 6.2.2 of
49、 GSM 04.64. 11 5.2.3 Service Access Point Identi fier (SAPI) 12 SAPI identifies a point at which LLC services are provided by an LLE to a layer - 3 13 entity. Consequently, SAPI identifies an LLE that should process an LLC frame and also 14 a layer - 3 entity that is to receive information carried by the LLC frame. 15 TIA/EIA - 136 - 333 8S API allows 16 service access points to be specified. The SAPI values are allocated as 1 shown in Table 1 . 2 Table 1 : Allocation of SAPI values 3 SAPI Related
