1、 ETSI TS 124 250 V14.0.0 (2017-07) LTE; Protocol for Reliable Data Service between UE and SCEF; Stage 3 (3GPP TS 24.250 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 124 250 V14.0.0 (2017-07)13GPP TS 24.250 version 14.0.0 Release 14Reference DTS/TSGC-0124250ve00 Keywords LTE ETSI 6
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7、n of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are trademarks of ETSI registered for the benefit
8、of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members GSM and the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 124 250 V14.0.0 (2017-07)23GPP TS 24.250 version 14.0.0 Release 14Intellectual Property Rights
9、 IPRs essential 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 ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, o
10、r potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by E
11、TSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (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 3rd Generation Partn
12、ership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI id
13、entities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “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 (Ve
14、rbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 124 250 V14.0.0 (2017-07)33GPP TS 24.250 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology
15、2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Overview 6g34.1 General . 6g34.2 Reference Model 7g34.3 Description of RDS protocol 7g34.3.1 Protocol functions . 7g34.3.2 Acknowledged operation 8g34.3.3 Unacknowledged opera
16、tion 8g35 Frame structure and format of fields 8g35.1 General . 8g35.2 Address and Control field . 8g35.2.1 Address and Control field format . 8g35.2.2 Protocol Discriminator bit (PD) 10g35.2.3 Address bit (ADS) 10g35.2.4 Source port number (Source Port) 10g35.2.5 Destination port number (Destinatio
17、n Port) 10g35.2.6 Information transfer frame - I . 11g35.2.7 Supervisory frame - S . 11g35.2.8 Unconfirmed Information frame - UI . 11g35.2.9 Unnumbered frame - U . 11g35.2.10 Command / Response bit (C/R) 11g35.3 Control field parameters and associated state variables . 11g35.3.1 Acknowledgement req
18、uest bit (A) 11g35.3.2 Acknowledged operation variables and parameters 12g35.3.2.1 Send state variable V(S) 12g35.3.2.2 Acknowledge state variable V(A) . 12g35.3.2.3 Send sequence number N(S) . 12g35.3.2.4 Receive state variable V(R). 12g35.3.2.5 Receive sequence number N(R) 12g35.3.2.6 Selective Ac
19、knowledgement (SACK) bitmap R(n) 12g35.4 Commands and responses 12g35.4.1 General 12g35.4.2 Unnumbered (U) frames . 13g35.4.2.1 SET_ACK_MODE command . 13g35.4.2.2 DISCONNECT command . 13g35.4.2.3 ACCEPT response 13g35.4.2.4 ERROR command / response 13g35.4.2.5 SET_PARAMETERS command / response 14g35
20、.4.3 Information (I) and Supervisory (S) frames 14g35.4.3.1 General 14g35.4.3.2 Selective Acknowledgement (SACK) command / response . 14g36 Protocol procedures 15g36.1 Overview 15g36.2 Procedures 15g3ETSI ETSI TS 124 250 V14.0.0 (2017-07)43GPP TS 24.250 version 14.0.0 Release 146.2.1 Types of RDS pr
21、ocedures . 15g36.2.2 Establishment of acknowledged transfer procedure . 15g36.2.2.1 General 15g36.2.2.2 Establishment of acknowledged transfer procedure initiation 15g36.2.2.3 Establishment of acknowledged transfer procedure accepted by receiver 16g36.2.2.4 Establishment of acknowledged transfer pro
22、cedure completed by originator . 16g36.2.2.5 Establishment of acknowledged transfer procedure not accepted by receiver 16g36.2.3 Acknowledged information transfer procedure 17g36.2.3.1 General 17g36.2.3.2 Transmitting I frames and requesting acknowledgements 17g36.2.3.3 Receiving I frames and sendin
23、g acknowledgements . 18g36.2.3.4 Receiving acknowledgements . 18g36.2.4 Termination of acknowledged transfer procedure 19g36.2.4.1 General 19g36.2.4.2 Termination of acknowledged transfer procedure initiation . 19g36.2.4.3 Termination of acknowledged transfer procedure accepted by receiver . 19g36.2
24、.4.4 Termination of acknowledged transfer procedure completed by originator 19g36.2.4.5 Termination of acknowledged transfer procedure not accepted by receiver . 20g36.2.5 Unacknowledged information transfer procedure . 20g36.2.5.1 General 20g36.2.5.2 Unacknowledged information transfer procedure in
25、itiation 20g36.2.5.3 Unacknowledged information transfer procedure accepted by receiver . 20g36.2.5.4 Unacknowledged information transfer procedure completed by originator 20g36.2.5.5 Unacknowledged information transfer procedure not accepted by receiver . 20g36.3 Abnormal cases 21g36.3.1 Expiry of
26、timer T200 21g36.3.2 Expiry of timer T201 21g36.4 List of RDS Parameters 21g36.4.1 General 21g36.4.2 RDS version number (Version) 21g36.4.3 Retransmission timers (T200 and T201) . 21g36.4.4 Maximum number of retransmissions (N200) 21g36.4.5 Maximum number of outstanding I frames (k) . 21g3Annex A (i
27、nformative): Change history . 22g3History 23g3ETSI ETSI TS 124 250 V14.0.0 (2017-07)53GPP TS 24.250 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work w
28、ithin the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TS
29、G for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes
30、have been incorporated in the document. ETSI ETSI TS 124 250 V14.0.0 (2017-07)63GPP TS 24.250 version 14.0.0 Release 141 Scope The present document specifies a Reliable Data Service (RDS) protocol between the UE and Service Capability Exposure Function (SCEF). The present document defines the frame
31、structure, format of fields and procedures for operation of the RDS protocol. RDS is mainly intended to be used for acknowledged data transfer, but it also supports unacknowledged data transfer. The present document is applicable to the UE and to the SCEF in the Evolved Packet System (EPS). 2 Refere
32、nces The following documents contain provisions which, through reference in this text, constitute provisions 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 rev
33、isions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905:
34、“Vocabulary for 3GPP Specifications“. 2 3GPP TS 23.682: “Architecture enhancements to facilitate communications with packet data networks and applications“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 1 a
35、nd the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 1. For the purposes of the present document, the following terms and definitions given in 3GPP TS 23.682 2 apply: SCEF 3.2 Abbreviations For the purposes of
36、 the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 1. RDS Reliable Data Service 4 Overview 4.1 General The Reliable Data S
37、ervice (RDS) protocol supports the following requirements: ETSI ETSI TS 124 250 V14.0.0 (2017-07)73GPP TS 24.250 version 14.0.0 Release 14- RDS supports peer-to-peer data transfers and shall provide reliable data delivery between the UE and the SCEF. The data is transferred via a PDN connection betw
38、een the UE and SCEF. - A UE can connect to multiple SCEFs. A UE can connect to multiple SCS/AS via the SCEF. - RDS shall support multiple applications on the UE to simultaneously conduct data transfers with their peer entities on the SCEF using a single PDN connection between the UE and SCEF. - RDS
39、shall support both acknowledged and unacknowledged data transfers. - RDS shall support variable-length frames and shall allow detection and elimination of duplicate frames at the receiving endpoint. 4.2 Reference Model MACRLCPDCPRRCNASApplicationMACRLCPDCPRRCL2IPSCTPS1APRelayLTE-Uu S1-MMEUE eNb MMEL
40、1 L1 L1L2IPSCTPS1APL2IPSCTPDiameterL1 L1L2IPSCTPDiameterApplicationL1RDSNASRDSSCEFT6aFigure 4.2-1: Protocol layering for reliable data transfer between UE and SCEF via E-UTRAN The reference model showing the protocol layering for reliable data transfer between UE and SCEF is illustrated in figure 4.
41、2-1. The RDS operates above the NAS and Diameter layers in the reference architecture. 4.3 Description of RDS protocol 4.3.1 Protocol functions RDS establishes a peer-to-peer logical link between the UE and SCEF. The logical link is identified by a pair of port numbers and EPS bearer ID. Each port n
42、umber is used to identify an application on the UE side or SCEF side and is carried in the address field of each frame. The source port number identifies the application on the originator and the destination port number identifies the application on the receiver. When a single application on the ori
43、ginator conducts data transfer with a single application on the receiver, the source port number and destination port number need not be used. Each RDS frame shall consist of a header and an information field of variable length. The header shall contain information about port numbers and the frame n
44、umber that is used to identify the frame and provide reliable transmission. The information field contains the payload to be transferred between the UE and SCEF. The UE establishes a PDN connection with the SCEF either during Attach or through UE requested PDN connectivity. The UE shall use the EPS
45、bearer ID to select the bearer to transfer RDS PDUs to the SCEF. The EPS bearer ID identifies the destination (at the UE or SCEF) and is not carried in the frame as it is already included in the NAS ESM ETSI ETSI TS 124 250 V14.0.0 (2017-07)83GPP TS 24.250 version 14.0.0 Release 14message header. On
46、ce the UE and network successfully negotiate to use RDS for a particular PDN connection, the PDN connection shall transfer data only using RDS protocol. RDS shall support both single and multiple applications within the UE. RDS shall provide fuctionality for flow control and sequence control to main
47、tain the sequential order of frames across the logical link. 4.3.2 Acknowledged operation In acknowledged operation the information is transmitted in order in numbered Information (I) frames. The I frames are acknowledged at the RDS layer. Error recovery and reordering mechanisms based on retransmis
48、sion of acknowledged I frames are specified. Several I frames can be acknowledged at the same time. Flow control is implemented via a sliding window mechanism. The procedure for establishment of acknowledged transfer is described in clause 6. 4.3.3 Unacknowledged operation In unacknowledged operatio
49、n the information is transmitted in numbered Unconfirmed Information (UI) frames. The UI frames are not acknowledged at the RDS layer. Error recovery and reordering mechanisms are not defined. Duplicate UI frames are discarded. Flow control procedures are not defined. 5 Frame structure and format of fields 5.1 General The peer-to-peer transfers using RDS shall conform to the frame format as shown in figure 5.1-1. The frame header shall consist of the Address and Control field and is a minimum of 1 octet and a maximum of 3 octets long. The Information field is of
