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ITU 150

Question 7/11

Question 7/11 – Signalling and control requirements and protocols for network attachment supporting multi-screen service, future networks, and M2M
(Continuation of Question 7/11)


During the 2009-2012 study period, ITU‑T has conducted studies on signalling requirements and protocols for network attachment of next generation networks (NGN), focusing on the interfaces between network attachment control functions (NACF) and other entities, including resource and admission control functions (RACF), service control functions (SCF) and mobility management and control functions (MMCF). As identified in the start of 2009-2012 study period, mobility and identification issues in NACF have been introduced in stage two works, to enforce Question 7/11 to work for making revisions on NACF signalling protocols. It will be continued in this study period, while taking emerging issues into account.
NGN will involve a wider range of service, including convergence aspects, based on its IP-based connectivity capability, to have multiple sources of heterogeneous media and multiple display devices of different capabilities in dynamic combination for collaboration. This is the so called "multi-screen service" or "N-screen service", and the network attachment functionality and protocols are expected to bridging the source and the device to realize it. Those will involve federated authentication and configuration for dynamic media handover, per-session allocation of IP addresses and terminal configuration, network access authorization checking, in-session modification of service connectivity, attachment control for fixed mobile convergence (FMC), and other functions. These procedures will have to be designed to take into account protocols such as PPP, DHCP, RADIUS and DIAMETER.
Maximizing service versatility and device capability also requires the maximization of resource utilization and awareness based control. Accordingly, the core aspects of future networks, such as virtualization and software defined networking for access network, must be considered. Network attachment will evolve along with the introduction of future networks, while taking SG 13 relevant studies into account.
Machine-to-machine (M2M), Internet of things (IoT) and even device-to-device (D2D) communication technologies potentially impact NACF; a huge number of machine devices can generate excessive signalling traffic simultaneously, short and frequent traffic from the machine devices could be unsuitable for traditional network attachment. Wider range of QoS categories could be required to allocate attachments, and D2D communication might need the support of the access infrastructure. This aspect will impact NACF while providing new requirements to attachment functionalities and signalling protocols.
Recommendations in force: Q.3201, Q.3202.1 (Q.nacf.auth1), Q.suppl.58(Q.NGN-trx.profile), Q.3223(Q.nacp.Ru), Q.3221(Q.nacp.S-TC1), Q.3222(Q.nacp.Ng), Q.3220(Q.nacp.0) Q.3203 (Q.nacf.mob2), Q.3230(Q.nacp.M13), Q.IdM.sig, Q.nacp.M1, Q.nacp.M2, Q.nacp.Nc, Q.nacp.Ne.
Study items to be considered include, but are not limited to:
  • What is the best recommendation structure to handle the revisions of NACF signalling protocol requirements?
  • What new recommendations are required to specify signalling and control requirements and protocols for supporting attachment for multi-screen service?
  • What associated mechanisms are required with attachment signalling and control to assure security for multi-screen service?
  • What functional architecture and entities are required for network attachment for supporting future networks, including software defined networking in access network?
  • What functional architecture and entities are required to support M2M, IoT and D2D services focusing on its access attachment signalling and protocol, etc.?
Tasks include, but are not limited to:
  • Development of signalling requirements and protocols to support revisions of network attachment protocol requirements
  • Development of signalling requirements and protocols to support attachment procedures for multi-screen service
  • Development of control and signalling requirements and protocols to support attachment procedures for future networks
  • Development of control and signalling requirements and protocols to support M2M, IoT and D2D for its network attachment functions.
An up-to-date status of work under this Question is contained in the SG 11 work programme
  • ITU‑T Y.2014 (2008) "Network attachment control functions in Next-Generation Networks"
  • ITU‑T Y.2018 (2009) "Mobility management and control framework and architecture within the NGN transport stratum"
  • ITU‑T Y.2701 (2007)"Security requirements for NGN release 1"
  • Questions 1/11, 2/11 and 4/11
Study groups
  • SG 13 on future networks architecture and mobility aspects, especially Question 14/13
  • SG 13 and SG 16 on multi-screen service
  • SG 13 and SG 16 on M2M and IoT service aspects
  • SG 17 on security aspects and identity management
Standardization bodies
  • ISO/IEC JTC1 WG7 on sensor networks, IETF, DLNA, OMA, oneM2M, 3GPP
  • Regional and other SDOs dealing with future Internet, multi-screen, and M2M