SHARP: A Joint Spectrum Allocation, Handover and Routing Protocol for Cognitive Radio Ad Hoc Networks

In general, any CR network can access multiple frequency bands with different channel bandwidths and characteristics, and any CR can have different QoS requirements or support specific applications. Therefore, after spectral hole detection, an effective channel allocation strategy must be implemented to allocate available resources based on requests from different CRs and this process involves spectral determination based on the requirements of each CR application be called. Furthermore, intelligent and adaptive routing interference between the PU and itself is required in a CR network (ie, a multihop cognitive wireless ad hoc network) that includes multihop communication and does not have a predefined structure.

Different ad hoc network routing protocols have been proposed in recent years according to specific characteristics of ad hoc wireless network routing protocols. The IETF 's MANET working group is currently focused on researching ad - hoc network routing protocols and agreeing on many draft protocols such as DSR, AODV, ZRP. In addition, professional researchers have published several articles related to ad hoc network routing protocols. Many network routing protocols such as DSDV and WRP are proposed for ad hoc networks. According to the principle of routing triggers, the current routing protocols can be categorized into three types: active routing protocols, reactive routing protocols, and hybrid routing protocols.

This paper studies ad hoc networking model and its network layer through NS2 simulation and mainly studied comparison and analysis of popular ad hoc routing protocol. The purpose of this paper is to research and develop key technologies for self - organizing network routing protocols based on ad - hoc network architecture. Furthermore, due to the unique structure of the ad hoc network, the characteristics of ad hoc networks must be fully considered when designing and building networks. This helps to design routing protocols appropriate for a particular network structure to maximize network-wide performance.

An important issue in ad hoc network design is the development of routing protocols that provide high quality and efficient communication between two nodes. Routing protocols dedicated to ad hoc networks are required because traditional Internet-based routing protocols can not accommodate these characteristics because the mobility characteristics of networks constantly change the network topology. The design must satisfy the following conditions.