Revenue-oriented bandwidth allocation in optical OFDM intra data center networks

Optical orthogonal frequency division multiplexing (O-OFDM) technology, which divides fiber bandwidth into multiple OFDM subcarriers, enables high bandwidth and fine granularity intra data center networks (DCNs) to provide powerful platform for cloud computing. An important issue raised in such O-OFDM based intra-DCNs is how to assign contiguous subcarriers for connection requests with the aim to balance the revenue of cloud providers with the connection performance of tenants. In this paper, considering the limited bandwidth, we firstly propose a revenue model that introduces a penalty policy for assuring connection performance according to the reservation price paid by tenants. We then study revenue-oriented bandwidth allocation problem over O-OFDM intra-DCNs based on the proposed revenue model. For a special case that there is no background traffic while conducting bandwidth allocation, we show that the problem can be transformed into a minimum cost network flow problem. For the case that extremely strict penalty is regulated, we design a two-phase algorithm to solve the problem. An efficient heuristic algorithm is also proposed to settle the problem with general form. The efficiency of the work is finally demonstrated by simulations.