ARIB TR-T12-22.936 V8.0.0 Multi
Contents
1. Introduction In the past operators within a country or a region deployed single system networks and consequently users got service from a single system terminal Multi mode terminals were sometimes deployed to maximise coverage particularly during times of transition between radio access technologies e g cdma AMPS but the same core network was always used In the future it is likely that operators will operate more than one system and the core networks will be different This may happen either through choice or company merger acquisition There will be cases where operators have different systems in the same geographic area and cases where operators use different systems in different regions It is also likely that there will be roaming agreements between operators of different systems Therefore the market for multi system terminals will increase and consideration is needed in 3GPP if new standardisation will be required or not Leaving system selection unspecified could lead to differences between vendor implementations Whereas this may in itself not be a problem it needs to be ensured that 3GPP specifications are followed by multi system terminals with 3GPP capability and that no harm to 3GPP networks is caused 3GPP Release 8 5 3GPP TR 22 936 V8 0 0 2008 12 1 Scope The present document studies the behaviour of a multi system terminal that supports both 3GPP and non 3GPP systems Particular issues handled include but are not2. restricted to Whether the system selection or PLMN selection should take higher priority in a multi system terminal Criteria for system change Interaction between the user s and the operator s preferences Support of automatic and manual system selection mode Different methods of system selection and their impact on 3GPP specifications Some areas for possible standardization to ensure 3GPP compliance and protection of 3GPP networks The present document treats non 3GPP networks in a generic way but it applies mainly to the case of 3GPP2 3GPP compliant terminals 2 References The following documents contain provisions which through reference in this text constitute provisions of the present document e References are either specific identified by date of publication edition number version number etc or non specific e Fora specific reference subsequent revisions do not apply e Fora 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 Vocabulary for 3GPP Specifications 2 3GPP TS 22 011 Service accessibility 3 Definitions and abbreviations 3 1 Definitions Multi mode terminal Terminal which supports multiple access technologies and accesses 3GPP core network e g GSM UMTS Multi sys
3. 26 2005 01 22 936 Output of drafting group in 0 2 0 0 3 0 SA1 27 2005 07 22 936 Output of drafting group in 0 3 0 0 4 0 SA1 29 0 4 0 1 00 2005 07 296 5 29 0 4 0 1 0 0 Fc SA1 30 a a presentation to SA 30 SSE a SP 31 1SP 060043 181 060291 A 936 0001 Revision of the Scope of BMSU TR22 936 J Re s Updated from Rel 7 to Rei 8_ 7 0 0 8 0 0 3GPP
4. 6 4 4 Category 3 Selection method of one system to extended to another 6 4 4 1 Example A extended aat eate 6 4 4 2 Example B extended PRE xs de aie EEEE EES 6 4 5 Category 4 Multiple systems operational simultaneously eee sesesecsseeecseeeecseeeeesececeeecaeeseceeeseeeeeneeeeeeaees 7 5 Use Cases 7 5 1 8 ahs Raid 7 5 2 RE il oh led ates Bana ale eal anes 7 6 Considerations for multi system 7 6 1 tases cas E E E E E RS 7 6 2 SUbSCrIptl ON aspects a esol Somer A asennad oan ee dios 8 6 3 MIMI aspects E sbbeeaess4hy 8 6 4 Charging aspects aero Atala en adie apt dob danse 8 6 5 aspects cusses e ening apne corel aie 8 6 6 Target time to select System epee 8 6 7 System preference Settings hun ai went ow aienae seein aout ae 8 6 8 eres oE n E E E
5. A TTC All rights reserved UMTS is a Trade Mark of ETSI registered for the benefit of its members 3GPP is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners GSM and the GSM logo are registered and owned by the GSM Association 3GPP Release 8 3 3GPP TR 22 936 V8 0 0 2008 12 Contents Fore WOT Lerner Ree Tee cn ee eee 4 Introductio lave ene dae Da ane eve ea Rhee 4 1 eat iach aa eke saad de nate 5 2 IRELERENCES 4 Gola Us 5 3 Definitions and abbreviations 5 a E a i 5 3 1 5 3 2 ADDreviatiOns 5 4 Categories of multi system terminals snoeren resar ateei e E arek N io eie igoke 6 4 1 Common Characteristics E EE ee A E EEEE E EE E E a EE E E EE EE ET 6 4 2 Category I Manual s withing osnon EESE AE ENRE E EEE E ASEE Ee ea 6 4 3 Category 2 Automatic switching by an overlay function sssseeeesesessstsrsreresssrstsrererersstsrsrerrersrsrerrereesrseseee
6. ARIB 12 22 936 V8 0 0 Multi system terminals Release 8 Refer to Notice in the preface of ARIB TR T12 for Copyrights 22 936 8 0 0 2008 12 Technical Report 3rd Generation Partnership Project Technical Specification Group Services and Systems Aspects Multi system terminals Release 8 AL The present document has been developed within the 3 Generation Partnership Project 3GPP and may be further elaborated for the purposes of 3GPP The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented This Specification is provided for future development work within 3GPP only The Organizational Partners accept no liability for any use of this Specification Specifications and reports for implementation of the 3GPP system should be obtained via the 3GPP Organizational Partners Publications Offices Release 8 2 3GPP TR 22 936 V8 0 0 2008 12 Keywords LTE UMTS terminal 3GPP Postal address 3GPP support office address 650 Route des Lucioles Sophia Antipolis Valbonne FRANCE Tel 33 4 92 94 42 00 Fax 33 4 93 65 47 16 Internet http www 3gpp org Copyright Notification No part may be reproduced except as authorized by written permission The copyright and the foregoing restriction extend to reproduction in all media 2008 3GPP Organizational Partners ARIB ATIS CCSA ETSI TT
7. Ta E E O a a E Re eee Ade 9 6 8 1 1 E E KE E A R did EE E E REE O RE EE 9 6 8 2 Switch on or recovery from lack of coverage 9 6 8 3 User reselec tom E EEN ERE 9 6 8 4 Systemi Eao a nla eh RE AVENE T SEE E a 9 7 N EE EE E E 10 7 1 ONLA DATA E E 10 7 2 General requirements for system selectins 10 e ur SESS ESSES 1 Release 8 4 3GPP TR 22 936 V8 0 0 2008 12 Foreword This Technical Report has been produced by the 3 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 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 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 technical enhancements corrections updates etc z the third digit is incremented when editorial only changes have been incorporated in the document
8. ases Example 1 Luke who has a multi system terminal uses the services of his 3GPP operator A While on vacation in another country the available networks are the 3GPP network of operator B offering very basic 3GPP functionalities and the non 3GPP network of operator C offering equivalent services compared to operator A Ideally Luke would like his device to select the non 3GPP operator C to be able to take advantage of the similarity of services If his device selects operator B Luke can select operator C manually if he wishes Example 2 Andrew who has a multi system terminal uses the services of his 3GPP operator A While on vacation in another country the available networks are the 3GPP network of operator B offering a wide range of 3GPP functionalities and the non 3GPP network of operator C offering equivalent services compared to operators A and B Ideally Andrew would like his device to select 3GPP operator B because services should generally work better in the same system e g no transcoding If his device selects operator C Andrew can select operator B manually if he wishes Example 3 Leia who has a multi system terminal uses the services of her 3GPP operator A While on vacation in another country the available networks are the 3GPP network of operator B and the non 3GPP network of operator C Operator A and C have a commercial alliance Therefore operator A would prefer that the non 3GPP operator C will be selected Leia
9. can select operator B manually if she wishes Example 4 Harry who has a multi system terminal uses the services of his 3GPP operator A While on vacation in another country the available networks are the 3GPP network of operator B and the non 3GPP network of operator C Operator A and C are in fact owned by the same company Therefore operator A would like to be sure that the non 3GPP operator C will be selected Harry can select operator B manually if he wishes Note In the above examples it is assumed that there are roaming agreements between operators A B and C 5 2 Non roaming cases Example 5 Ana who has a multi system terminal uses the services of operator A Operator A operates both 3GPP and non 3GPP system in the same area Operator A wishes to control when Ana uses each system for reasons of load sharing and to ensure that Ana gets the best possible user experience Ana can manually select either system Example 6 Paul who has a multi system terminal uses the services of operator A Operator A operates a 3GPP system Paul s terminal is capable of accessing the internet via WLAN not I WLAN e g for web browsing and VoIP Paul has a tariff with operator A that allows him to connect to the internet via WLAN and use the services of an ISP 6 Considerations for multi system terminals 6 1 General categorization of usage Multi system terminals will be used a When an operator deploys more than one system in the same ge
10. e compliant with 3GPP specifications when in 3GPP mode and that there are no adverse affects on networks due to different categories There are requirements in TS 22 011 Release 7 to cover categories 1 and 2 Categories 3 and 4 may require closer co operation between standardization bodies Functionality beyond system selection such as interworking or handover between different systems would also require close co operation No further standardization in 3GPP is envisaged at the moment It is recognised that other standardisation bodies may do work on specifications for multi system terminals when in non 3GPP mode It should not be the intention of one standardization group to impose requirements of its system on the other 7 2 General requirements for system selection The method of system selection must provide means for the operator to set system preferences It may also allow user to set system preferences but more consideration is needed in this area The method of system selection must having switched to a different system be capable of switching back to the original system The method of system selection should allow manual system selection as this is likely to be a regulatory requirement in some regions 3GPP Release 8 11 TR 22 936 V8 0 0 2008 12 Change history Change history CR__ Rev Rel__ Cat Subject Comment Old SA1 2004 10 22 936 Output of drafting group in 0 1 0 0 2 0 SA1
11. erminal to any one system manually One possible implementation would display the system name along with the network name No new standardisation for MMI is expected 6 4 Charging aspects The charging mechanisms associated with each system will be used Handover between systems may require a review of charging specs anchor principle 6 5 Security aspects The security mechanisms associated with each system will be used 6 6 Target time to select system The time taken to do network and system selection may be longer than it already is for a single system terminal 6 7 System preference settings User experience is important issue of system selection Multi system terminal should use the most suitable access system for services e g PS for internet access while considering the cost The operator preference settings parameters default behaviour for system selection will be important The three reasons that influence the operator s preference are in order of importance 1 Commercial In roaming situations commercial factors will also determine the home operator s preference for selection of system For example when a partner network is found in another system and non partner networks in the 3GPP Release 8 9 3GPP TR 22 936 V8 0 0 2008 12 same system preference will be towards the former This case could be handled by defining default behaviour e g always select home network or detailed multi system preference li
12. me network Background scan should naturally be done in both directions Background scanning must not lead a ping pong situation 3GPP Release 8 10 3GPP TR 22 936 V8 0 0 2008 12 Whether and for how long user manual preference settings are retained is also an issue Further consideration will be required for the length of time that user preferences can override operator preferences and if user preference settings are retained after an event recovery from lack of coverage power off 7 Conclusion 7 1 Overview In this study there are four different categories defined Category 1 Manual Switching Category 2 Automatic switching with an overlay function Category 3 Extending the selection of one system to another and Category 4 Multiple systems operating simultaneously The different categories have increasing level of interaction between the 3GPP and non 3GPP systems starting with category which does not have any interaction at all and the selection between the systems is done manually There are and will be even more terminals supporting both 3GPP specifications and non 3GPP specifications and it is important that the 3GPP specifications do not prohibit the use of these terminals It is not important that different categories of Multi System terminal are implemented as long as they behave as the home network operator wants them to It is important that Multi System terminals with 3GPP capability must b
13. n 6 8 2 Switch on or recovery from lack of coverage Operator defined default rules are needed 6 8 3 User reselection Manual reselection should be possible An application should not initiate reselection without the permission of the user 6 8 4 System switching The overlay function is supposed to make decisions on when to switch from one system e g 3GPP to another system e g 3GPP2 It also should have possibility to return to other systems Background scan could be allowable or not and if allowable could be automatic or manual The result of a background scan could be displayed to the user or used for automatic reselection of system The need for automatic or manual scan will depend on the situation In the case where an operator deploys multiple systems in the same area it will be acceptable for operators to allow the automatic scan because after the search the terminal will still be connected to the same operator In roaming cases background scans could lead to display or attempted connection to a system that the user can not access Roaming agreements between operators could be reflected in the system list resulting from a background system scan Unless system and network priorities are specified there will be cases when the terminal stays in a visited network even though the home network is available in another system The home operator will need to determine which is most important to be in the same system or the ho
14. nformation is passed to an overlay function which decides if to change system System is changed by selecting USIM or R UIM in the case of 3GPP2 depending on user and or operator s preferences 4 4 Category 3 Selection method of one system to extended to another 4 4 1 Example A extended PLMN list The 3GPP network selection mechanism could be extended to non 3GPP networks Non 3GPP entries e g cdma2000 SSID could be contained in the 3GPP Preferred PLMN RAT List Note 1 Significant work would be needed 3GPP and GSM A to allow non 3GPP network information to be contained in the PLMN list However one implementation specific solution may be for a dummy entry switch to PRL to be placed in the preferred PLMN list 4 4 2 Example B extended PRL The 3GPP2 network selection mechanism could be extended to non 3GPP2 networks GSM W CDMaA or SSID information could be contained in the 3GPP2 PRL 3GPP Release 8 7 3GPP TR 22 936 V8 0 0 2008 12 Note 2 Work is being done in 3GPP2 on this method 4 5 Category 4 Multiple systems operational simultaneously User can access the internet directly via WLAN while the terminal is connected to the cellular network at the same time Note 1 While connected to the 3GPP network the terminal will follow 3GPP specifications 3GPP 2 parts of the terminal may be active at the same time e g for different applications 5 Use cases 5 1 Roaming c
15. ographic area 3GPP Release 8 8 3GPP TR 22 936 V8 0 0 2008 12 b When an operator operates different systems in different geographic areas or has roaming agreements with operators of other systems in different geographic areas 6 2 Subscription aspects There are two kinds of subscription from a user s perspective single subscription to an operator and multiple subscriptions to multiple operators In the single subscription case a user subscribes only to a single operator and either the operator deploys several systems or the operator deploys one of the systems and has a roaming agreement with operators deploying other systems An interworking function is required because of the different core networks used A practical example of this scenario is GAIT In the multiple subscriptions case a user could select operators for each system by himself and subscribe to them all or one operator could organise other subscriptions on his behalf and take care of call forwarding The latter is more likely For example in an early deployment of multi system terminals there is a subscription with operator who also provides a GSM subscription SIM and deals with call forwarding but there is a close commercial link between the two operators and the user only deals with one of them Multiple subscriptions to one operator is another possible combination 6 3 MMI aspects A user should be able to configure the multi system t
16. sts 2 Load sharing If an operator operates more than one system in the same geographic area loadsharing factors will determine the operator s preference for system selection 3 Customer experience Services provided by the home operator e g SS MMS MBMS LCS IMS PoC etc may work better when the terminal roams in networks of the same system that the home operator has This may be because of transcoding Therefore the home operator may be interested in preferring the same system if there are no over riding commercial factors New methods for setting and updating the system selection parameters should not require new heavy machinery Mechanisms that reuse the already existing mechanisms e g SIM toolkit OMA device management should be preferred Update and setting of system parameters is duty of the operator 6 8 System selection 6 8 1 Overview System selection could be divided into 3 cases switch on or recovery from lack of coverage user reselection and system switching In the case of an overlay functionality that overlay functionality should contain a mechanism to indicate a user and or an operator preference to decide which system i e GSM UMTS or CDMA to choose to access i e which application R UIM or USIM will be selected in priority This mechanism should occur before the identity module of either technology is selected The existing network specific selection procedure will then control the initial network selectio
17. tem terminal Terminal which supports both the 3GPP system and non 3GPP system s Non 3GPP system Mobile telecommunications system having non MAP core network with specifications which are outside the control or influence of 3GPP 3GPP system MAP core network and various access networks 3GPP2 system 15 41 core network and various cdma access network Other definitions are given in 3GPP TR 21 905 1 3 2 Abbreviations For the purposes of the present document the following abbreviations apply PRL Preferred Roaming List 3GPP Release 8 6 TR 22 936 V8 0 0 2008 12 GAIT GSM ANSI 136 Interoperability R UIM Removable User Interface Module a 3GPP2 abbreviation Further abbreviations are given in 3GPP TR 21 905 1 4 Categories of multi system terminals 4 1 Common characteristics and non 3GPP system s in the same terminal Benefit to the user Increased coverage area Wider range of services Can use one terminal for both systems 4 2 Category 1 Manual switching The user manually selects system Separate 3GPP and non 3GPP identities e g USIM and R UIM When in 3GPP system terminal does not scan non 3GPP systems and vice versa 4 3 Category 2 Automatic switching by an overlay function When in 3GPP system terminal scans non 3GPP systems and vice versa Terminal does not suspend operation on a system while it scans for the other i e dual transceivers Scanning i
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