ITU-T Y 2028-2015 Intelligent access selection in multi-connection (Study Group 13)《多连接中的智能接入选择(研究组13)》.pdf

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1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Y.2028 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2015) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Frameworks and functional archite

2、cture models Intelligent access selection in multi-connection Recommendation ITU-T Y.2028 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middlewar

3、e Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.11

4、99 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over N

5、GN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.22

6、99 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOUD COMPU

7、TING Y.3500Y.3999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2028 (06/2015) i Recommendation ITU-T Y.2028 Intelligent access selection in multi-connection Summary The objective of Recommendation ITU-T Y.2028 is to describe intelligent access selection mechan

8、isms in multi-connection. Scenarios, requirements, considerations and solutions on security, as well as pricing aspects are also covered. In a multi-connection environment, intelligent access selection is a mechanism for the network and/or mobile device to select the preferred network access based o

9、n a set of selection criteria (e.g., service type, bandwidth). History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y.2028 2015-06-29 13 11.1002/1000/12509 Keywords Access selection, multi-connection, network discovery. _ * To access the Recommendation, type the URL http:/handle.

10、itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T Y.2028 (06/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of tele

11、communications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing teleco

12、mmunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the pr

13、ocedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a te

14、lecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of

15、 these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS

16、ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU me

17、mbers or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may

18、not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.20

19、28 (06/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Scenarios and requirements 3 6.1 Scenarios . 3 6.2 Requirements 4 7 Solutions . 5 7.1 Overv

20、iew 5 7.2 Access discovery solution 5 7.3 Access selection solution 6 Bibliography. 9 Rec. ITU-T Y.2028 (06/2015) 1 Recommendation ITU-T Y.2028 Intelligent access selection in multi-connection 1 Scope As smartphone devices have proliferated, the capability of these terminals has also improved far mo

21、re than before. Moreover, big data may improve the performance of huge-volume data collection and analysis on access/network profiles. Since access discovery and selection require both terminal and network parts to be involved, there are two distinct methods to exchange the details of access and use

22、r preferences. The principle to estimate a solution has two aspects: 1) cost: Is it less expensive? 2) experience: Is it better? As cost is a key attribute for users to choose access, network selection depends on information such as location and subscriber policy, as well as price policy of the acce

23、ss. For example, when a person enters a coffee shop, they may prefer free access. However, this kind of selection refers to user location where the access is deployed separately; only users can acquire the complete access list dynamically. On the other hand, access providers can set the price policy

24、 and confirm the authorization status of a subscribers access to the service. The experience issue also needs to consider two parts: 1) personal requirements, such as high speeds for gaming or high bandwidth for video; 2) network status, such as whether there is congestion, or whether it requires co

25、mplex authentication methods like extensible authentication protocol subscriber identity module (EAP-SIM). Before starting the access selection process, there are some information asymmetries between a user and an unknown network. Multiple accesses provide various choices for access selection. The i

26、ntelligent solution would meet several requirements, such as: less user intervention, less user training, less service interruption, less access congestion and lower cost. This Recommendation describes scenarios, requirements, unified registration solutions, and other aspects such as security and pr

27、icing for intelligent access selection in multi-connection. See also ITU- T.Y.2251. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions i

28、ndicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-

29、T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Y.2027 Recommendation ITU-T Y.2027 (2012), Functional architecture of multi-connection. ITU-T Y.2251 Recommendation ITU-

30、T Y.2251 (2011), Multi-connection requirements. 2 Rec. ITU-T Y.2028 (06/2015) 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 connection b-ITU-T X.200: A connection is an association established for the transfer of data between two or m

31、ore peer-(N)-entities. This association binds the peer-(N)-entities together with the (N-1)-entities in the next lower layer. 3.1.2 mobility b-ITU-T Q.1706: The ability for the user or other mobile entities to communicate and access services irrespective of changes of the location or technical envir

32、onment. 3.1.3 multi-connection ITU-T Y.2251: The functionality which provides capability to the user equipment (UE) and network to maintain more than one access network connection simultaneously. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 mobile d

33、evice: A device capable of connecting to a mobile access network (e.g., 2G, 3G, 4G, Wi-Fi) including the feature phone, smart phone, tablet, laptop, camera, vehicle, etc. 3.2.2 network discovery: In a multi-connection environment, network discovery is a mechanism for mobile devices to discover all a

34、vailable network accesses and optionally display their names on the mobile devices. 3.2.3 network selection: In a multi-connection environment, network selection is a mechanism for the network and/or mobile device to select the preferred network access based on a set of selection criteria (e.g., ser

35、vice type, bandwidth). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AAA Authentication, Authorization, Accounting AN Access Network ANR Automatic Neighbour Relations AP Access Point EAP-SIM Extensible Authentication Protocol Subscriber Identity Modu

36、le LTE Long Term Evolution MCF Multi-Connection Functional entity MUE Multi-connection User Equipment QoE Quality of Experience QoS Quality of Service SSID Service Set Identifier UE User Equipment W-CDMA Wideband Code Division Multiple Access WiMAX Worldwide Interoperability for Microwave Access Wi-

37、Fi Wireless Fidelity WLAN Wireless Local Area Network Rec. ITU-T Y.2028 (06/2015) 3 5 Conventions In this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. Th

38、e keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus this

39、requirement need not be present to claim conformance. The keywords “is not recommended“ indicate a requirement which is not recommended but which is not specifically prohibited. Thus, conformance with this specification can still be claimed even if this requirement is present. The keywords “can opti

40、onally“ indicate an optional requirement which is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it me

41、ans the vendor may optionally provide the feature and still claim conformance with the specification. 6 Scenarios and requirements 6.1 Scenarios 6.1.1 Access discovery scenario When coverage of multiple access technologies is available, it is important for terminals to have the capability to discove

42、r and select the available and/or desired network(s). Use case 1: heterogeneous access discovery Alice arrived at a foreign airport that has ubiquitous wideband code division multiple access (W-CDMA) network coverage everywhere and Wi-Fi only at certain places. Whether she was using the W-CDMA servi

43、ce or not, Alice is able to discover the Wi-Fi network when she moves into the range covered by an access point (AP). The W-CDMA Node B to which Alice has attached might also discover the presence of the Wi-Fi AP. Use case 2: independent owner discovery Alice leaves the airport and arrives at her ho

44、tel. When she checks in, she finds there are three different service set identifiers (SSIDs) (i.e., names of the Wi-Fi networks): the first is provided by a local operator, the second is owned by the hotel and the third comes from a personal device (such as an Android AP). Alices mobile device would

45、 identify the owners for each access by private/enterprise/home operator/visit operator, etc. The network might also recognize Alices role, e.g., whether she is a roaming subscriber, a customer of the hotel or only a guest. Use case 3: different access status discovery Alice purchases a rate card an

46、d accesses Wi-Fi provided by a visited operator. She then enters a caf. The caf allows its customers to enjoy free Wi-Fi from the same operator but using a different SSID. Therefore, Alices terminal is informed that there is an additional Wi-Fi access that is different from hers in price or current

47、traffic load, quality of service (QoS), security, available internet/IPv4/IPv6, etc. The network is also able to assess whether she needs to reselect her current access. 4 Rec. ITU-T Y.2028 (06/2015) 6.1.2 Access selection scenario Since multi-connection may benefit users to obtain better quality of

48、 experience (QoE) and benefit operators to balance traffic loads and increase network performance and reliability, mobile devices or the network may initiate access selection to cover certain requirements. The access selection scenario is detailed below: Use Case 1: Valid access selection Alices han

49、dset discovered an SSID launched by a high-power AP. However, Alice was too far from the AP to allow her handsets reply to return to the AP. Thus, the AP was unavailable to Alice. Subsequently, her handset deleted the SSID of the AP from her handsets SSID list. Use Case 2: Dynamic access reselection Alice is on a moving bus. She is listening to music online via Wi-Fi. Her device is using SSID1 to access AP1. After a while, the bus, travelling to another place, forces Alices device to disconnect fro