Background of PON abstraction interface for time-critical application
There are two aspects of issues being addressed from the operator’s point of view. Firstly, the operators need to provide sustainable broadband services for residential users on widely deployed fiber access networks. To keep the services cost-effectively, operators need to update the PON functions, which include a function that needs time-critical processing, by using software update. This enables operators NOT to rebuild an OLT from the preliminary stage of development (e.g. re-make of PON chip), which requires a large amount of investment.
The second aspect is that the operators wish to provide a large variety of services on access network, such as broadband service for business users and mobile fronthaul for 5G. This should be a new business opportunity not only for operators but also for vendors, since a disaggregated OLT based on the proposal can be applicable to 5G mobile fronthaul by replacing a low-latency DBA software.
Extract from bbf.2017.170.02
For flexible and agile service adaptation at a low cost in the next-generation optical access system, a new system architecture, which is based on SDN/NFV technologies, should be required from operators’ point of view. The most promising way to pursue the new architecture is disaggregating PON functions to functional modules with open interfaces. A project stream “PON Abstraction Interface for Time-Critical Applications” leads to progress the architecture further by specifying a PON abstraction interface for time-critical processing functions, e.g. Dynamic Bandwidth Assignment (DBA), which is not covered existing BBF documents and on-going projects.
This Working Text is the first phase in a two phase project. It defines the functional modules and interfaces so as to disaggregate a PON function that needs time-critical processing. The second phase, which is the another document as WT-403, defines the detail specifications of the interfaces as commonly usable among vendors and operators.[a1]
The scope of this project is to specify the PON abstraction interface for time-critical applications, that has not yet been discussed in BBF and other SDOs. The project assumes the disaggregation of access systems by using SDN/NFV technologies, and generally follows what other projects in BBF have done so far. However, in order to replace or update time-critical processing functions (e.g. DBA), the soft wares must be replaced or updated with the use of commonly usable (or open) APIs in the OLT.
The project consists of two phases as following.
Phase1: To define the functional modules and interfaces so as to disaggregate a PON function (e.g. DBA) that needs time-critical processing.
Phase2: To define the detail specifications of the interfaces as commonly usable among vendors and operators.