1、 ETSI TS 124 250 V14.1.0 (2018-01) LTE; Protocol for Reliable Data Service between UE and SCEF; Stage 3 (3GPP TS 24.250 version 14.1.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 124 250 V14.1.0 (2018-01)13GPP TS 24.250 version 14.1.0 Release 14Reference RTS/TSGC-0124250ve10 Keywords LTE ETSI 6
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9、s Essential patents 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 (
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13、e an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP ide
14、ntities, 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 identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present docum
15、ent “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 (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except w
16、hen used in direct citation. ETSI ETSI TS 124 250 V14.1.0 (2018-01)33GPP TS 24.250 version 14.1.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviat
17、ions . 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 operation 8g35 Frame structure and format of fields 8g35.1 General . 8g35.2 Address and Control field . 8g35.2.1 Addre
18、ss 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 (Destination Port) 10g35.2.6 Information transfer frame - I . 11g35.2.7 Supervisory frame - S . 11g35.2.8 Unconfirmed Inform
19、ation 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 request bit (A) 11g35.3.2 Acknowledged operation variables and parameters 12g35.3.2.1 Send state variable V(S) 12g35
20、.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 Acknowledgement (SACK) bitmap R(n) 12g35.4 Commands and responses 12g35.4.1 General 12g35.4.2 Unnumbered (U) frames
21、 . 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 14g35.4.3 Information (I) and Supervisory (S) frames 14g35.4.3.1 General 14g35.4.3.2 Selective Acknowledgement (SACK)
22、command / response . 14g36 Protocol procedures 15g36.1 Overview 15g36.2 Procedures 15g3ETSI ETSI TS 124 250 V14.1.0 (2018-01)43GPP TS 24.250 version 14.1.0 Release 146.2.1 Types of RDS procedures . 15g36.2.2 Establishment of acknowledged transfer procedure . 15g36.2.2.1 General 15g36.2.2.2 Establish
23、ment 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 procedure completed by originator . 16g36.2.2.5 Establishment of acknowledged transfer procedure not accepted by rec
24、eiver 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 sending acknowledgements . 18g36.2.3.4 Receiving acknowledgements . 18g36.2.4 Termination of acknowledged transfer proc
25、edure 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 . 19g36.2.4.4 Termination of acknowledged transfer procedure completed by originator 19g36.2.4.5 Termination of acknowledg
26、ed 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 initiation 20g36.2.5.3 Unacknowledged information transfer procedure accepted by receiver . 20g36.2.5.4 Unacknowled
27、ged 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 timer T200 21g36.3.2 Expiry of timer T201 21g36.4 List of RDS Parameters 21g36.4.1 General 21g36.4.2 RDS version
28、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) . 21g36.4.6 Maximum length of Information Field (N201) . 21g3Annex A (informative): Change history . 22g3History 23g3ETSI ETSI TS
29、 124 250 V14.1.0 (2018-01)53GPP TS 24.250 version 14.1.0 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 within the TSG and may change following formal TSG approval
30、. 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 TSG for information; 2 presented to TSG for approval; 3 or g
31、reater 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 have been incorporated in the document. ETSI ETSI TS 124 2
32、50 V14.1.0 (2018-01)63GPP TS 24.250 version 14.1.0 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 structure, format of fields and procedures for operation o
33、f 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 References The following documents contain provisions which, thr
34、ough 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 revisions do not apply. - For a non-specific reference, the l
35、atest 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: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 23.682: “A
36、rchitecture 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 and the following apply. A term defined in the present docu
37、ment 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 the present document, the abbreviations given in 3GPP TR
38、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 Service (RDS) protocol supports the following requirements:
39、 ETSI ETSI TS 124 250 V14.1.0 (2018-01)73GPP TS 24.250 version 14.1.0 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 between the UE and SCEF. - A UE can connect to multiple SCEFs.
40、 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 shall support both acknowledged and unacknowledged data tr
41、ansfers. - 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 MMEL1 L1 L1L2IPSCTPS1APL2IPSCTPDiameterL1 L1L2IPSCTPDiameterAp
42、plicationL1RDSNASRDSSCEFT6aFigure 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 4.2-1. The RDS operates above the NAS and Diameter layers in
43、 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 number is used to identify an application on the UE side or
44、 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 originator conducts data transfer with a single application o
45、n 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 number that is used to identify the frame and provide relia
46、ble 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 bearer ID to select the bearer to transfer RDS PDUs to the
47、 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 V14.1.0 (2018-01)83GPP TS 24.250 version 14.1.0 Release 14message header. Once the UE and network successfully negotiate to use RDS fo
48、r 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 maintain the sequential order of frames across the logical lin
49、k. 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 retransmission 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 operation the information is trans
