Patent ID: 8503878
Filing Date: 2013-08-06
Classification: H04J,H04L

Abstract:
1. A method of transmitting data over a communication network, wherein a plurality of data flows are carried by respective subcarriers using orthogonal frequency division multiplexing, the method comprising: classifying each of a plurality of data flows as having a respective data flow type; assigning each data flow to one of a plurality of subcarrier groups, based on the data flow's type, wherein each subcarrier group comprises a respective plurality of subcarriers; transmitting first data flows assigned to a first subcarrier group exclusively on respective subcarriers in the first subcarrier group; and transmitting second data flows assigned to a second subcarrier group together on all of the subcarriers in the second subcarrier group; wherein flow-subcarrier mapping (FSM) with said transmitting steps includes following constraints: where R denotes data rate, M denotes optical OFDM subcarriers, N denotes traffic flows, λ is related to traffic intensity, ij denoting i th data flow mapped to j th subcarrier and Pi,j denoting percentage of i th data flow's traffic that is assigned to j th subcarrier.