Passive Optical Network(PON)is considered as a crucial networking technology for the next-generation industrial Internet due to its advantages of high bandwidth,cost-effectiveness and resistance to electromagnetic interference.However,the technical development of conventional PON is based on the principle of"bandwidth enhancement"that makes its transmis-sion scheduling mechanism difficult to meet the transmission requirements of"time-sensitive"industrial services.This poses a significant challenge to the network transmission capability of conventional PON,necessitating the incorporation of determin-ism as a new characteristic.This paper mainly investigates the Time Division Multiplexing(TDM)-PON.First of all,it illus-trates the service characteristics and transmission requirements of industrial Internet,and two major technical challenges facing conventional TDM-PON in industrial scenarios are analyzed:One is indeterminate delay caused by the traditional bandwidth al-location scheme;and the other indeterminate delay caused by the inflexible scheduling mechanism.Focusing on the above chal-lenges,this paper summarizes the key technologies to enhance the deterministic transmission capability of TDM-PON,such as collaborative transmission interfaces,multi-bursts per frame,and Deterministic Bandwidth Allocation(DetBA).Then,this paper proposes a network calculus based delay boundary modeling method as a theoretical model for the design and performance evaluation of deterministic industrial PON systems.Finally,potential technologies and directions for deterministic industrial PON are discussed,including the service layer,the Media Access Control(MAC)layer,the physical layer,and the control and management plane.
维普
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