Page 554 - Unleashing the potenti al of the Internet of Things

5 Unleashing the potential of the Internet of Things

6.3.1 Transport stratum functions

The transport stratum functions are required to be extended to support requirements of USN
applications and services. The extensions of the transport stratum functions are given in the
following clauses.

6.3.1.1 Transport functions
The following functional requirements are supported by the existing capabilities of the transport
functions [ITU-T Y.2012]:
• Application traffic control requirement:
The access network functions, edge functions and core transport functions are used for
satisfying an application traffic control requirement which requests the management of
transaction volume generated by the USN end-users.
• Differentiated QoS and data prioritization requirement:
USN mission-critical applications and services should be carefully managed. For example,
emergency notification of a fire case must be delivered by a time-critical and reliable way
to appropriate national disaster monitoring systems. The access network functions, edge
functions and core transport functions provide differentiated QoS and data prioritization
capabilities.

6.3.1.2 Transport control functions
There are no extended capabilities in the transport control functions to support USN applications
and services. The following functional requirements are supported by the transport control functions
[ITU-T Y.2012]:
• Differentiated QoS and data prioritization requirement:
As described in clause 6.3.1.1, USN applications and services require differentiated QoS
and data prioritization. The resource and admission control functions (RACF) provides this
capabilities in cooperation with the transport functions.
• Connectivity requirement:
Both IP-based and non IP-based sensor networks can connect to NGN. When a non
IP-based sensor network connects to NGN, an IP-capable gateway is used. The network
attachment control function (NACF) provides connectivity to IP-based and non-IP based
sensor networks through gateways.

• Location management requirement:
The NACF provides a location management capability at the IP layer. If a sensor network
uses IP addresses directly or a USN gateway provides IP-based connectivity, the location
information management of sensor networks at the IP layer is supported by the NACF.

• Mobility requirement:
The access network functions provide a mobility capability of a sensor network as well as
mobility of a sensor node within a sensor network or across sensor networks. If a sensor
network is based on IP technologies, the mobility management and control functions
(MMCF) provide functions for the support of IP-based mobility of a sensor network as well
as a sensor node.
• Identification, authentication and authorization:
The NACF provides authentication of the USN end-users and authorization of network
access.

540 Rec. ITU-T Y.4403/Y.2026 (07/2012)