1、 ETSI TR 144 901 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE External Network Assisted Cell Change (NACC) (3GPP TR 44.901 version 15.0.0 Release 15) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 144 901 V15.0.0 (2018-07)13GPP TR 44.
2、901 version 15.0.0 Release 15Reference RTR/TSGR-0644901vf00 Keywords GSM ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N
3、 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the
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9、0 (2018-07)23GPP TR 44.901 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and
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13、tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present docu
14、ment 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 identities can be found under http:/webap
15、p.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “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 “mus
16、t not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 144 901 V15.0.0 (2018-07)33GPP TR 44.901 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and
17、 abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Introduction and Motivation . 7g34.1 Task Description 7g34.2 GPRS Cell Reselection pre-Release 4 7g34.3 NACC in GERAN Release 4, Short description 7g34.3.1 System Information Reception . 8g34.3.2 Cell Change Notification (CCN) Mode Proc
18、edures 8g34.4 Extension of NACC in Release 5 . 8g34.4.1 General 8g34.4.2 Short Technical Description . 10g35 Requirements 10g35.1 Architectural Requirements 10g35.1.1 Case 16 - Intra-UTRAN case 11g35.1.2 Case 4, 8, 12: GERAN g198 UTRAN 11g35.1.3 Case 13 - 15: UTRAN g198 GERAN . 12g35.2 Node Requirem
19、ents 12g35.2.1 BSC . 12g35.2.2 RNC 12g35.2.3 SGSN 13g35.2.4 MSC 13g35.3 Interface Requirements . 13g35.3.1 Gb interface 13g35.3.2 A interface 13g35.3.3 Iu interface 13g35.3.4 Iur-g (Iur) interface . 13g35.3.5 Gn interface 14g35.3.6 Uu interface 14g35.3.7 Um interface . 14g36 Generic mechanism for ex
20、change of RAN information . 14g36.1 General . 14g36.2 Generic RIM procedures for exchange of RAN information . 14g36.2.1 General 14g36.2.2 RAN Information Request procedure . 15g36.2.3 RAN Information Send procedure 15g36.2.4 RIM support in CN/RAN nodes. 16g36.3 Messages for RAN information 16g36.3.
21、1 Message format . 16g36.3.2 Message Type . 16g36.3.3 Addressing and routeing . 16g36.3.4 Container Prefix and Container Units . 17g36.3.4.1 General 17g36.3.4.2 Container Prefix 18g36.3.4.3 Container Unit . 18g37 Exchange of RAN information for external NACC . 18g3ETSI ETSI TR 144 901 V15.0.0 (2018-
22、07)43GPP TR 44.901 version 15.0.0 Release 157.1 Principles for use of the generic mechanism for exchange of RAN information for NACC application . 18g37.1.1 General 18g37.1.2 Container Unit Disposition for NACC 18g37.1.3 Error Handling 18g37.1.4 External NACC software support in RAN nodes . 19g38 In
23、terface load 19g39 Phased approach for the implementation . 20g310 Open Issues 20g311 Specification Impact and Associated Change Requests . 20g311.1 General . 20g311.2 3GPP TS 23.060 GPRS; Stage 2 description 20g311.3 3GPP TS 44.018 Mobile radio interface layer 3 specification . 20g311.4 3GPP TS 44.
24、060 GPRS RLC/MAC Protocol . 20g311.5 3GPP TS 48.018 BSS GPRS Protocol (BSSGP) 20g311.6 3GPP TS 29.060 GPRS Tunneling Protocol (GTP) . 20g311.7 3GPP TS 25.41x UTRAN Iu interface . 20g3Annex A: Change History . 21g3History 22g3ETSI ETSI TR 144 901 V15.0.0 (2018-07)53GPP TR 44.901 version 15.0.0 Releas
25、e 15Foreword This Technical Report 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. Should the TSG modify the contents of the present document, it will
26、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 greater indicates TSG approved document under change control. y the sec
27、ond 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 TR 144 901 V15.0.0 (2018-07)63GPP TR 44.901 version 15.0.0 Release 151 Scope T
28、his Technical Report provides background information, motivations, concepts and requirements regarding an extended Network Assisted Cell Change (NACC) feature for external cell change support. Cell change between GERAN and UTRAN cells is outside the scope of this report, although consideration has b
29、een taken in order to allow an easier extensibility to that case. The extension is based on the Release 4 version of the NACC feature where the mobile station is only supported by the NACC when performing internal cell re-selection, i.e. within a BSC. The extension of the feature is for GERAN just a
30、ffecting BSS and for the core network the SGSN and signalling links between these network nodes. To support cell changes between GERAN and UTRAN, also the Um and the Uu interfaces are affected. The evolved Release 4 NACC proposal as described in this TR provides the basis for the detailed Stage 2 an
31、d stage 3 specification work. The feature will be developed in a phased approach and a longer-term vision is presented in the report. The focus of the TR is to: - Define the requirements on different nodes - Specify the requirements for the interfaces - Propose a plan for the work item project - Eva
32、luation of what does and does not need to be standardised 2 References 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,
33、 etc.) or non-specific. - For a specific reference, subsequent revisions 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 docume
34、nt in the same Release as the present document. 1 3GPP TD GP-010361, “Network Assisted Cell Change; Concept document“ 2 3GPP TS 48.018: “General Packet Radio Service (GPRS); BSS GPRS Protocol (BSSGP)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the foll
35、owing definitions apply: External cell change: Change of cells where old and new cell do not belong to the same BSC. External neighbouring cells: Cells listed in the BA-lists within a BSC that belongs to other BSCs. Extended neighbouring cell list: List of System information received from the extern
36、al neighbour cells to be used in the Network Assisted Cell Change procedure. Service outage time: The time between the last received uplink RLC block from the mobile station in the old cell and the mobile stations first uplink RLC block received in the new cell. 3.2 Abbreviations For the purposes of
37、 the present document, the following abbreviations apply: ETSI ETSI TR 144 901 V15.0.0 (2018-07)73GPP TR 44.901 version 15.0.0 Release 15CCN Cell Change Notification EDGE Enhanced Data rates for GSM Evolution GERAN GSM/EDGE Radio Access Network GPRS General Packet Radio Service NACC Network Assisted
38、 Cell Change NC Network Control mode (can be NC0, NC1 or NC2) O GERAN Iu indicates a BSC connected to SGSN only via Iu and GERAN Iu/Gb indicates a BSC connected to SGSN via both Iu and Gb. This paper does not consider cell reselection scenarios involving CDMA 2000 cells. ETSI ETSI TR 144 901 V15.0.0
39、 (2018-07)103GPP TR 44.901 version 15.0.0 Release 15Table 4.1.1.b: Possible combinations of cell changes Case No From To Traffic via 1 GERAN Gb GERAN Gb SGSN 2 GERAN Gb GERAN Iu/Gb SGSN 3 GERAN Gb GERAN Iu SGSN 4 GERAN Gb UTRAN SGSN5 GERAN Iu GERAN Gb SGSN 6 GERAN Iu GERAN Iu/Gb SGSN or Iur-g 7 GERA
40、N Iu GERAN Iu SGSN or Iur-g 8 GERAN Iu UTRAN SGSN or Iur 9 GERAN Iu/Gb GERAN Gb SGSN 10 GERAN Iu/Gb GERAN Iu/Gb SGSN or Iur-g 11 GERAN Iu/Gb GERAN Iu SGSN or Iur-g 12 GERAN Iu/Gb UTRAN SGSN or Iur 13 UTRAN GERAN Gb SGSN14 UTRAN GERAN Iu/Gb SGSN or Iur 15 UTRAN GERAN Iu SGSN or Iur 16 UTRAN UTRAN SGS
41、N or Iur 4.4.2 Short Technical Description For fast reselection of cells, the MS needs to have knowledge of certain system information of the target cell before performing the cell change. If the cells then belong to different BSCs/RNCs, the required system information has to be transported between
42、BSCs/RNCs when updated to be made available to the MSs when re-selecting cells. The required system information is proposed to be packed into a container within a new RAN-INFORMATION message that may be sent on the Iur-g interface or routed via the Core Network (by one or more SGSNs) from the origin
43、 to the target RAN node. The information in the container shall be transparent for the Core Network. When system information is received, the target BSC/RNC can be ordered to acknowledge the information. If the acknowledgement is requested but not received by the source BSC/RNC, it is an implementat
44、ion option how to perform retransmission. When system information is received, the information can optionally be associated with a validity timer. After the validity timer expiration the associated system information shall not be used for immediate initial access in the new cell. A BSC/RNC may reque
45、st another BSC/RNC to respond with one or multiple RAN-INFORMATION messages or to stop transmission of event driven messages. 5 Requirements 5.1 Architectural Requirements In order to fulfil all the traffic cases as listed in Table 4.1.1.b, the BSC, the RNC and the SGSN nodes are all affected. The i
46、nterfaces which requires update are Um, Uu, Gb, Iu, Gn and Iur-g. The Table 5.1.a below lists the required changes for the different cases. ETSI ETSI TR 144 901 V15.0.0 (2018-07)113GPP TR 44.901 version 15.0.0 Release 15Table 5.1.a: Required changes for the different cell changes. Case No From To Af
47、fected nodes Affected Network Interface Affected Radio Interface 1 GERAN Gb GERAN Gb BSC, SGSN Gb, Gn - 2 GERAN Gb GERAN Iu/Gb BSC, SGSN Gb, Gn and opt Iu - 3 GERAN Gb GERAN Iu BSC, SGSN Gb, Gn and Iu - 4 GERAN Gb UTRAN BSC, RNC, SGSN Gb, Gn and Iu Um and Uu 5 GERAN Iu GERAN Gb BSC, SGSN Gb, Gn and
48、Iu - 6 GERAN Iu GERAN Iu/Gb BSC, SGSN Iu, Gn and opt (Gb and Iur-g) - 7 GERAN Iu GERAN Iu BSC, SGSN Iu, Gn and opt Iur-g - 8 GERAN Iu UTRAN BSC, RNC, SGSN Iu, Gn and opt Iur-g Um and Uu 9 GERAN Iu/Gb GERAN Gb BSC, SGSN Gb, Gn and opt Iu - 10 GERAN Iu/Gb GERAN Iu/Gb BSC, SGSN Gb, Gn or alternatively
49、(Iu or Iur-g) - 11 GERAN Iu/Gb GERAN Iu BSC, SGSN Iu, Gn and opt (Gb or Iur-g) - 12 GERAN Iu/Gb UTRAN BSC, RNC, SGSN Iu, Gn and opt (Gb and Iur-g) Um and Uu 13 UTRAN GERAN Gb BSC, RNC, SGSN Iu, Gn and Gb Uu 14 UTRAN GERAN Iu/Gb BSC, RNC, SGSN Iu, Gn and opt (Gb and Iur-g) Uu 15 UTRAN GERAN Iu BSC, RNC, SGSN Iu, Gn and opt Iur-g Uu 16 UTRAN UTRAN RNC, SGSN Iu, Gn and opt Iur Uu NOTE: The introduction of NACC for the different cases where UTRAN is a part might be of various importance. If any of these seven cases shall be covered is a decision to be taken together with the
