Downstream-based scheduling for energy conservation in green EPONs

作者：Chen Shen^*; Dhaini Ahmad R; Ho Pin Han; Shihada Basem; Shen Gangxiang; Lin Chih Hao

来源：Journal of Communications, 2012, 7(5 SPECL. ISSUE): 400-408.

DOI：10.4304/jcm.7.5.400-408

• Bandwidth allocation scheme
• Closed-form expression
• Conventional approach
• Dynamic bandwidth allocation
• Ethernet passive optical networks
• Green epon
• Mean packet delay
• Optical network units
• Queuing theory
• Sleep time
• System models
• Time slots
• Time windows
• Traffic delays
• Traffic performance
• Transmission cycles

Maximizing the optical network unit';s (ONU) sleep time is an effective approach for achieving maximum energy conservation in green Ethernet passive optical networks (EPONs). While overlapping downstream and upstream ONU transmissions can maximize the ONU sleep time, it jeopardizes the quality of service (QoS) performance of the network, especially for downstream traffic in case the overlapping is based on the upstream time slot. In this paper, we study the downstream traffic performance in green EPONs under the limited service discipline and the upstream-based overlapped time Specifically, we first derive the expected mean packet delay, and then present a closed-form expression of the ONU sleep time, setting identical upstream/downstream transmission cycle times based on a maximum downstream traffic delay requirement. With the proposed system model, we present a novel downstream bandwidth allocation scheme for energy conservation in green EPONs. Simulation results verify the proposed model and highlight the advantages of our scheme over conventional approaches.

• 出版日期2012