1、 ETSI TR 122 986 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); Study on Service Specific Access Control (3GPP TR 22.986 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 122 986 V15.0.0 (2018-07)13GPP TR 22.986 version 15.0.0 Release 15Reference RTR/TSGS-0122986vf00 Key
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13、 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 document may refer to technical specifications or reports using th
14、eir 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:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the p
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16、n direct citation. ETSI ETSI TR 122 986 V15.0.0 (2018-07)33GPP TR 22.986 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5
17、g33.2 Symbols 5g33.3 Abbreviations . 5g34 Use Cases . 6g35 Considerations 6g36 Candidate Requirements. 6g37 Conclusion 7g3Annex A: Change history 8g3History 9g3ETSI ETSI TR 122 986 V15.0.0 (2018-07)43GPP TR 22.986 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGe
18、neration 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 be re-released by the TSG with an identifying change of release da
19、te 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 second digit is incremented for all changes of substance, i.e. techni
20、cal enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction In an emergency situation, like Earthquake or Tsunami, degradation of quality of service may be experienced. Degradation in service availabil
21、ity and performance can be accepted in such situations, but mechanisms are desirable to minimize such degradation and maximize the efficiency of the remaining resources. When Domain Specific Access Control (DSAC) mechanism was introduced for UMTS, the original motivation was to enable PS service con
22、tinuation during congestion in CS Nodes in the case of major disaster like an Earthquake or a Tsunami. In fact, the use case of DSAC in real UMTS deployment situation has been to apply access control separately on different types of services, such as voice and other packet-switched services. For exa
23、mple, peoples psychological behaviour is to make a voice call in emergency situations and it is not likely to change. Hence, a mechanism will be needed to separately restrict voice calls and other services. As EPS is a PS-Domain only system, DSAC access control does not apply. This SSAC TR identifie
24、s specific features useful when the network is subjected to decreased capacity and functionality. Considering the characteristics of voice and non-voice calls in EPS, requirements of the SSAC could be to restrict the voice calls and non-voice calls separately. For a normal paid service there are QoS
25、 requirements. The provider can choose to shut down the service if the requirements cannot be met. In an emergency situation the most important thing is to keep communication channels uninterrupted, therefore the provider should preferably allow for a best effort (degradation of) service in preferen
26、ce to shutting the service down. During an emergency situation there should be a possibility for the service provider also to grant services, give extended credit to subscribers with accounts running empty. Under some circumstances (e.g. the terrorist attack in London on the 7 of July in 2005), over
27、load access control may be invoked giving access only to authorities or a predefined set of users. It is up to national authorities to define and implement such schemes. ETSI ETSI TR 122 986 V15.0.0 (2018-07)53GPP TR 22.986 version 15.0.0 Release 151 Scope This Technical Report (TR) presents the res
28、ults of the Study on Service Specific Access Control (SSAC). The intent of this Study is to assess the ability of 3GPP specifications to meet requirements identified for Services Specific Access Control. This Study considers the following aspects: - Study use cases and clarify issues in SSAC in EPS.
29、 - Describe the considerations and the problems with existing access control, which are identified in the use cases - Identify candidate requirements and aspects for providing SSAC in EPS. 2 References The following documents contain provisions which, through reference in this text, constitute provi
30、sions 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 latest version applies. In the case of a reference t
31、o 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 TR 23.898: “Access Class Barring and Overload Protection (ACBOP)
32、“ 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. 3.2 Symbo
33、ls For the purposes of the present document, the following symbols apply: 3.3 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbre
34、viation, if any, in TR 21.905 1. ETSI ETSI TR 122 986 V15.0.0 (2018-07)63GPP TR 22.986 version 15.0.0 Release 154 Use Cases Use case 1 Japanese operators provide Disaster Message Board services whenever a major disaster has happened such as an earthquake, tsunami or typhoon. This service enables the
35、 large number of subscribers to access the message board in order to post or retrieve information concerning the safety of individuals in the affected area with their mobile phones during a major disaster. The human psychological behaviour is to make a voice call in emergency situations. Thus increa
36、sed voice traffic consumes too much bandwidth for accessing other services such as the Disaster Message Board and/or data services (e.g. SMS). Hence, a limiting mechanism is required to differentiate bandwidth consuming real-time services (e.g. Voice) from bandwidth-efficient data service to access
37、to e.g. a Disaster Message Board. Use case 2 As described in the Use case 1 above, subscribers may wish to make voice calls to check on the safety of individuals and it may cause congestion. Under such a situation, prioritised subscribers (e.g. governmental, military civil authorities ) and (dependi
38、ng on national regulation) access to emergency services should still be allowed access to EPS, while voice calls for other subscribers are restricted. 5 Considerations In UMTS, Domain Specific Access Control (DSAC) has been introduced. According to Section 4.1.1 of TR23.898 x, the original motivatio
39、n was to enable PS service continuation during congestion in CS nodes. Although that was the original motivation, operators have been using DSAC to restrict CS calls while permitting PS sessions. Operators want to avoid service discontinuity in the packet data services due to the congestion in the v
40、oice calls side. Consequently, the use case of DSAC in a real deployment situation has been to apply access control separately on different types of services, such as voice and other packet-switched services. The voice services will be provided by MMTeL using IMS in EPS; however the VoIP will be use
41、d in the same way as the existing CS-domain voice services (e.g. including Emergency Calls). This means customer experience per “Service” in EPS is not different from UMTS. It is reasonable that DSAC principles are to be applied in the PS-domain only EPS as well. However, EPS is a PS-Domain only sys
42、tem, so the “Domain Specific” way of access control cannot be applied as it is now. Hence, “Service Specific” Access Control (SSAC) has to be specified and introduced to EPS. 6 Candidate Requirements The following is the principle for the Service Specific Access Control. 1. The EPS shall provide a c
43、apability to apply independent access control for telephony services (MMTEL) and other data services, for mobile originating session requests from idle-mode. 2. The EPS shall provide a capability to assign a service probability factor for each of MMTEL voice and MMTEL video: - assign a barring rate
44、(percentage) commonly applicable for Access Classes 0-9; - assign a flag barring status (barred /unbarred) for each Access Class in the range 11-15. SSAC shall not apply to Access Class 10. 3. The SSAC shall be provided by the VPLMN based on operator policy without accessing the HPLMN. 4. The SSAC s
45、hall provide mechanisms to minimize service availability degradation (i.e. radio resource shortage) due to the mass simultaneous mobile originating session requests and maximize the availability of the wireless access resources for non-barred services. ETSI ETSI TR 122 986 V15.0.0 (2018-07)73GPP TR
46、22.986 version 15.0.0 Release 157 Conclusion This Technical Report (TR) on Study on Service Specific Access Control (SSAC) identified the requirements for SSAC and considered the following aspects: - Use cases were documented and issues clarified for SSAC in EPS. - Considerations were described as w
47、ell as problems with existing access control, which are identified in the use cases. - Candidate requirements and aspects were identified for providing SSAC in EPS. From this study, it is concluded the following: - EPS is a PS-Domain only system, so the “Domain Specific” way of access control cannot
48、 be applied as it is now. Hence, “Service Specific” Access Control (SSAC) has to be specified and introduced to EPS. SSAC shall provide mechanisms to minimize service availability degradation (i.e. radio resource shortage) due to the mass simultaneous mobile originating session requests and maximize
49、 the availability of the wireless access resources for non-barred services. It is also concluded that the content of this TR be used as a basis for further work within 3GPP. ETSI ETSI TR 122 986 V15.0.0 (2018-07)83GPP TR 22.986 version 15.0.0 Release 15Annex A: Change history Change history TSG SA# SA Doc. SA1 Doc Spec CR Rev Rel Cat Subject/Comment Old New WI SP-42 SP-080786 S1-084390 22.986 - - Rel-9 - One-step-approved at SA#42 1.0.0 9.0.0 SSAC 2011-03 - - - - - - - Update to Rel-10 version (MCC) 9.0.0 10.0.0 2012-09 - - - - - - - Updated to Rel-11 by
