Research Of Network Entry Back Off Mechanism Based On IEEE 802.16

Since 1991,"Ad Hoc" adopted as the official term by IEEE 802.11 standards committee, just in few decades, all aspects of research work in this field have rapid changes. Ad Hoc network has many advantageous that traditional network doesn't have, for example, a high degree of dynamic topology, non-center, multi-hop routing, etc. All of these enable Ad Hoc network with a broad application prospects. However, modern communications needs also put forward more demands on Ad Hoc network, such as requiring faster speed to form an Ad Hoc network, and shorter time to let a new node join in the network. Therefore, the study of how to allow mobile nodes rapidly to form and join in an Ad Hoc network under some special scenarios has a theoretical value and practical significance.This thesis mainly studied on network entry back-off mechanism based on IEEE 802.16 MESH standard. Firstly, the thesis introduces the network entry process written in IEEE 802.16 MESH standard, as well as the conflict issue encountered during the network entry process in the wide-area network mode. Secondly, this thesis provides a back-off algorithm based on the classic binary back-off algorithm to resolve this issue. At last, we design and implement a network simulation environment to verify that the improved algorithm make better performance than classic algorithm associated with IEEE 802.16 mesh standard.