Research On Key Techniques Of Radio Resource Allocation In Relay-Enhanced Cellular Networks

As a low-power device, Wireless Sensor Networks integrates informationcollection, information processing, and wireless communications equipments. Itsextremely low-power feature ensure its uninterrupted work year after year, its tinyvolume easily adapt to eachspecies of the embedded environment, its convenientnetworking features make network connections more convenient. In order to blendWSN in with the IPv6network and greatly extend the application of WSN. IETF6LoWPAN working group was established, aimed at achieving IEEE802.15.4data andother link layer data in IPv6layer to achieve integration, blending WSN network in withIPv6network, making the WSN network exchange information with external moreconvenient. So far,6LoWPAN working group has a series of released adaptation layerdesign, the neighbor protocol optimization and routing requirements network protocolstandards.Linux system has been widely used for its powerful network function. From thelarge server clusters to the small embedded products, we can find a trace of it. Based onLinux’s powerful network subsystem and the support of IEEE802.15.4devices, and the6LoWPAN-related techical standards, this thesis achieves a6LoWPAN router. Therouter supports mesh-under routing protocal. Because of Linux’s native support for IPdata forwarding, data from the6LoWPAN network can be forwarded to other network.The main tasks include the following aspects:1. Analysis of the Linux networking subsystem, clear the mechanism of thetransmis-sion of data between the different levels, research the abstraction mechanismof the networking interface, learn the communication mechanism between the Linuxkernel and the user space.2. Based on the support for the IEEE802.15.4devices’ point-to-pointcommunication by Linux and the6LoWPAN’s mesh header, this thesis achieve a meshlayer. iproute2util can be used in this layer to create mesh devices. In this mesh device,there is a routing protocol. By the routing protocol, the mesh devices provide a meshnetwork with multi-hop communication mechanism. 3. According to RFC4944and RFC6282, this thesis formed a6LoWPAN adaptationlayer. iproute2util can be used in this layer to create6LoWPAN devices. The devicesare responsible for compressing and fragmenting the IP packets from IPv6layer,thenpassing it to the mesh layer. The devices also accept fragmentations from mesh layer,then decompress and assemble them and form a IPv6packet and pass it to IPv6layer.4. Based on the mesh layer framework, this thesis achived a matched routingprotocol. This is helpful for verifying the reasonableness of the framework, and it can bea good experimental platform for the further research of the routing protocol.Finally, on the basis of complete6LoWPAN router prototype system, this thesis setup a6LoWPAN test network, carried out a more detailed test of the router, including theoverall functional testing and functional testing of key components. These tests furthervalidate the availability and reliability of the6LoWPAN router. This router alsoprovides a good platform for the next step to further research6LoWPAN and relatedtechnologies.