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A spread spectrum sharing system framework design and implementation of the protocol stack

Author: LuZhanYi
Tutor: MaoYuMing
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: spectrum sharing hybrid network protocol stack extension interface PCI driver
CLC: TN925
Type: Master's thesis
Year: 2011
Downloads: 27
Quote: 2
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Abstract


Research shows that on the one hand the available spectrum is already very poor, on the other hand the utilization of radio and television frequencies that have good transmission effect are very low. The national 863 project that I have participated in ,dynamic spectrum sharing demonstration system, is in a mixed network structure. Without affecting the main users of radio and television spectrum the project wants to reuse of spectrum resources. The main target of this dissertation is to resolve the problem in the protocol stack design and implementation. This dissertation will include: design and implementation of interface between kernel module and user layer, design and implementation of the vertical expansion in protocol stack based on the original stack of Linux, design and implementation of the PCI driver which is droved by data packets and time at the same time. In accordance with the protocol stack level, the contents of this dissertation are arranged as follows.Firstly, since the project is a demonstration system, it requires that the user level is in the form of a graphical interface. In addition, it is needed to be able to adjustment use the channel and the device status. This requires the interface program can communicate with the kernel module or drivers. Linux system provides Netlink mechanisms and ioctl mechanism. After analysis and comparison between the two, the dissertation uses Netlink as the basic communication mechanism. Using QT to achieve the user interface program and communicate with a user Netlink process by Socket, and then the user process communicate with the kernel module by Netlink mechanism. This is to ensure the timeliness of response of the user interface program.Secondly, this dissertation discusses the design and implementation of the protocol stack in a hybrid network environment. The characteristics of the hybrid network protocol stack is: gateway nodes run two MAC protocols at the same time, and a convergence MAC sub-layer above the MAC is able to coordinate cognitive information, neighborhood information. Linux own protocol stack including: the application layer, Socket Layer, TCP / IP layer, the driver layer. Requirements of the project in the Linux protocol stack extension are to add a convergence MAC sub-layer, a distributed /centralized MAC layer under the IP layer. According to the requirements, this dissertation achieves the protocol stack vertical expansion of Linux system by using virtual network interface mechanism.Thirdly, the project will use three physical devices simultaneously in different frequency bands for data transmission, in order to achieve a higher transmission rate. This requires the PCI driver can manage multiple physical layer, and to provide a unified network interface for the upper layer. And the devices will produce too much interruption running at full speed, so the PCI driver must be droved by time and data packets simultaneously. This part is the biggest challenge.Finally, we will discuss the field measurements.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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