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Flexible bandwidth optical networking (FBON) based on optical orthogonal frequency-division multiplexing (O-OFDM) technology has been proposed to accommodate traffic over 100Gb/s in the future due to its flexibility in spectrum allocation. In FBON, due to the limit of spectrum continuity constraints (SCC), routing and spectrum allocation (RSA) suffers a lot from spectrum fragments. Therefore, a lot...
Service fairness of traffic with different granularities in elastic optical networks is addressed and correspondingly a fairness-aware spectrum allocation scheme is proposed. Simulation results imply that it achieves service fairness without significant blocking performance deterioration.
An energy efficient spectrum allocation algorithm in bandwidth-variable optical switching networks is proposed, in which the modulation format of subcarriers is selected in a dynamic way according to the real-time traffic loading.
We investigate launched power allocation of multi-rate transmission with mixed 16-QAM and QPSK OFDM signals, with fixed and flexible power allocation scheme discussed. Simulation results show that flexible allocation scheme achieves much better transmission performance.
We introduced a pattern-layered framework to investigate the routing and spectrum allocation in flexible optical network. A novel fragment-aware RSA algorithm is proposed and simulation results show that it outperforms previous studies.
We propose a novel collision-aware spectrum allocation scheme to avoid backward collision of spectrum reservation in flexible optical networks. This scheme achieves lower total blocking probability through effectively reducing backward blocking probability.
This paper develops an analytic model for wireless sensor network node that adopts sleep mechanism. Different from previous works, herein sensor node sleep period is modeled as arrival of group packet rather than server vacation. In addition, how sensor node queuing dynamics is effected by the packets generated during sleep period is particularly investigated. Using the presented model, analytical...
Channel quality indication (CQI) report is an important element of LTE and has significant impact on the system performance. The encoding method for CQI in 3GPP-LTE is Reed-Muller (RM) code and the transmission quality of CQI can be improved by channel coding with RM code. On the receiver, the contradiction between low latency which is one of goals of LTE and reliability of communication system can...
This paper proposes an analytic model to study queuing effect on the handoff performance of Mobile IPv6 (MIPv6), which has not been particularly investigated in previous literature. The presented model regards handoff process as tandem service system, and adopts a simple two-moment approximation throughout the theoretic modeling. Without other specific assumptions, the model presents a generic approach...
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