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A Study on the Cycle Time Optimizing and the Delay Reducing for the MAC of NGA PON  

Chung, Hae (금오공과대학교 전자통신과 통신망연구실)
Kim, Jin-Hee (KT 네트워크연구소)
Kim, Geun-Young (KT 네트워크연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.9A, 2009 , pp. 685-696 More about this Journal
Abstract
The requirements of the NGA are to provide broader bandwidth, higher splitting ratio, and longer reach than those of the current FTTH. In the TDMA PON accounting for large percentage in the total FTTH, the increase in distance between the OLT and the ONU leads to the increase in propagation delay and in packet delay three times more than the propagation delay. It is because a packet arrived in the ONU is handled through bandwidth request, grant, and transmission. To reduce the increased packet delay, the OLT have to reduce the cycle time. However, it will cause increased overhead and reduced link efficiency. In this paper, we investigate several problems in TDMA PON when the subscriber access network extended to 60 or 100 Km reach as a NGA goal and provide a method that determines an optimal cycle time to satisfy QoS for delay sensitive traffics. In particular, we suggest a variable equalized round trip delay method and a variable cycle time method. It is shown that the former reduces the packet delay and the latter increase the link efficiency.
Keywords
PON; NGA; MAC; Cycle time; FTTH;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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