1、 ETSI TR 144 901 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE External Network Assisted Cell Change (NACC) (3GPP TR 44.901 version 14.0.0 Release 14) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 144 901 V14.0.0 (2017-04)13GPP TR 44.
2、901 version 14.0.0 Release 14Reference RTR/TSGR-0644901ve00 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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6、o one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The co
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8、 Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 144 901 V14.0.0 (2017-04)
9、23GPP TR 44.901 version 14.0.0 Release 14Intellectual Property Rights 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 i
10、n ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or 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
11、, no investigation, including IPR searches, has been carried out by ETSI. 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 Techni
12、cal Report (TR) has been produced by ETSI 3rd Generation Partnership 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 deliver
13、ables. 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 document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in c
14、lause 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 when used in direct citation. ETSI ETSI TR 144 901 V14.0.0 (2017-04)33GPP TR 44.901 version 14.0.0 Release 14Contents Intellectual Property Rights 2
15、g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 7g34 Introduction and Motivation . 7g34.1 Task Description 7g34.2 GPRS Cell Reselection pre-Release 4 7g34.3 NACC in GERAN Release 4, Short
16、description 7g34.3.1 System Information Reception . 8g34.3.2 Cell Change Notification (CCN) Mode Procedures 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
17、.1.2 Case 4, 8, 12: GERAN barb2right UTRAN 12g35.1.3 Case 13 - 15: UTRAN barb2right GERAN . 12g35.2 Node Requirements 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)
18、interface . 14g35.3.5 Gn interface 14g35.3.6 Uu interface 14g35.3.7 Um interface . 14g36 Generic mechanism for exchange of RAN information . 14g36.1 General . 14g36.2 Generic RIM procedures for exchange of RAN information . 15g36.2.1 General 15g36.2.2 RAN Information Request procedure . 15g36.2.3 RA
19、N Information Send procedure 15g36.2.4 RIM support in CN/RAN nodes. 16g36.3 Messages for RAN information 16g36.3.1 Message format . 16g36.3.2 Message Type . 17g36.3.3 Addressing and routeing . 17g36.3.4 Container Prefix and Container Units . 18g36.3.4.1 General 18g36.3.4.2 Container Prefix 18g36.3.4
20、.3 Container Unit . 18g37 Exchange of RAN information for external NACC . 18g3ETSI ETSI TR 144 901 V14.0.0 (2017-04)43GPP TR 44.901 version 14.0.0 Release 147.1 Principles for use of the generic mechanism for exchange of RAN information for NACC application . 18g37.1.1 General 18g37.1.2 Container Un
21、it Disposition for NACC 19g37.1.3 Error Handling 19g37.1.4 External NACC software support in RAN nodes . 19g38 Interface 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
22、; Stage 2 description 20g311.3 3GPP TS 44.018 Mobile radio interface layer 3 specification . 21g311.4 3GPP TS 44.060 GPRS RLC/MAC Protocol . 21g311.5 3GPP TS 48.018 BSS GPRS Protocol (BSSGP) 21g311.6 3GPP TS 29.060 GPRS Tunneling Protocol (GTP) . 21g311.7 3GPP TS 25.41x UTRAN Iu interface . 21g3Anne
23、x A: Change History . 22g3History 23g3ETSI ETSI TR 144 901 V14.0.0 (2017-04)53GPP TR 44.901 version 14.0.0 Release 14Foreword 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 a
24、nd 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 TSG for informati
25、on; 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 have been incor
26、porated in the document. ETSI ETSI TR 144 901 V14.0.0 (2017-04)63GPP TR 44.901 version 14.0.0 Release 141 Scope This Technical Report provides background information, motivations, concepts and requirements regarding an extended Network Assisted Cell Change (NACC) feature for external cell change sup
27、port. Cell change between GERAN and UTRAN cells is outside the scope of this report, although consideration has been 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 NAC
28、C when performing internal cell re-selection, i.e. within a BSC. The extension of the feature is for GERAN just affecting 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 aff
29、ected. The evolved Release 4 NACC proposal as described in this TR provides the basis for the detailed Stage 2 and 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
30、on different nodes - Specify the requirements for the interfaces - Propose a plan for the work item project - Evaluation 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 prese
31、nt 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 latest version applies. In the case of a reference to a 3GPP document
32、(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 TD GP-010361, “Network Assisted Cell Change; Concept document” 2 3GPP TS 48.018: “General Packet Radio Service (GPRS); BSS GPRS Protocol (
33、BSSGP)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following 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
34、belongs to other BSCs. Extended neighbouring cell list: List of System information received from the external 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
35、 the mobile stations first uplink RLC block received in the new cell. ETSI ETSI TR 144 901 V14.0.0 (2017-04)73GPP TR 44.901 version 14.0.0 Release 143.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CCN Cell Change Notification EDGE Enhanced Data rates fo
36、r GSM Evolution GERAN GSM/EDGE Radio Access Network GPRS General Packet Radio Service NACC Network Assisted 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
37、 paper does not consider cell reselection scenarios involving CDMA 2000 cells. ETSI ETSI TR 144 901 V14.0.0 (2017-04)103GPP TR 44.901 version 14.0.0 Release 14Table 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
38、 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 GERAN 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
39、Iur 13 UTRAN GERAN Gb SGSN14 UTRAN GERAN Iu/Gb SGSN or Iur 15 UTRAN GERAN Iu SGSN or Iur 16 UTRAN UTRAN SGSN 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 t
40、he cells then belong to different BSCs/RNCs, the required system information has to be transported between 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 th
41、at may be sent on the Iur-g interface or routed via the Core Network (by one or more SGSNs) from the origin 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 in
42、formation. If the acknowledgement is requested but not received by the source BSC/RNC, it is an implementation 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 associ
43、ated system information shall not be used for immediate initial access in the new cell. A BSC/RNC may request 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 al
44、l the traffic cases as listed in Table 4.1.1.b, the BSC, the RNC and the SGSN nodes are all affected. The interfaces 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 V14.0.0 (2017-04)113GPP TR 44.90
45、1 version 14.0.0 Release 14Table 5.1.a: Required changes for the different cell changes. Case No From To Affected 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
46、 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 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
47、 Iu/Gb GERAN Gb BSC, SGSN Gb, Gn and opt Iu - 10 GERAN Iu/Gb GERAN Iu/Gb BSC, SGSN Gb, Gn or alternatively (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,
48、 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 a
49、ny of these seven cases shall be covered is a decision to be taken together with the RAN subgroups. 5.1.1 Case 16 - Intra-UTRAN case In Case 16 fast cell re-selection is already available when the neighbouring cells are operating on same frequency which is assumed to be the normal case in UTRAN. A single-RX UE will then be able to read the broadcast information from the new cell while still listening to the PICH/FACH in the old cell. Since this means that the UE can read broadcast information before actually moving to the new cell, the service interruption for the
