Font Size: a A A

The Research Of Cross-layered Scheduling Scheme For Multi-traffics Based On OFDM

Posted on:2009-04-04Degree:MasterType:Thesis
Country:ChinaCandidate:Z LiuFull Text:PDF
GTID:2178360245470024Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
At present, cross-layered design and optimization across the physical and MAC layers are desired for wireless resource allocation and packet scheduling, and it becomes the focus of people.In this paper, a simplified layered scheduling scheme is presented, which is based on utility-based scheduling, such as Max-Delay-Utility (MDU) scheduling in this paper. In this scheme, the scheduling is divided into two steps—macro and micro scheduling. In macro step, the utility functions of traffics are defined, according to which the scheduling order of various services is determined. Then in micro step, the scheduling is among all users of the traffic type which is determined in macro step. By simulation in a multi-user orthogonal frequency division multiplexing (OFDM) network, it is demonstrated that the simplified layered MDU scheduling can effectively handle multiple traffic types with diverse QoS requirements and achieve almost the same performance from the view of utility, delay, throughput and fairness as MDU does. Moreover, the simplified layered MDU scheduling has much lower computational complexity than the MDU scheduling and almost the same utility values.The thesis introduced the target of the research and the background knowledge such as wireless resource management, then it showed the traffics and wireless channels models. Next, it described the system modeling of the layered scheduling scheme and displayed the simulation results and analysis. In the end, we concluded what we got and introduced the next research context.
Keywords/Search Tags:OFDM, Max-Delay-Utility (MDU), scheduling, utility function
PDF Full Text Request
Related items