Network Model-Delay 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY Usually,the time needed for links to change state is much larger than the time scale used in scheduling,routing,etc. Therefore,we assume that it won't take much time for transmission between connected node pairs.In this paper, we mainly focus on the delay caused by the lack of instantaneous connectivity which is closely related to the node density in such a netwok. Scheduling and Routing Propagation Delay Cause of Network Resources (Denoted by t) Delay Propagation Speed Lack of Instantaneous Connectivity- Waiting Delay Fundamental Relationship between Node Density and Delay in Wireless Ad Hoc Networks with Unreliable Links 1010 Network Model-Delay ❑ Usually, the time needed for links to change state is much larger than the time scale used in scheduling, routing, etc. Therefore, we assume that it won't take much time for transmission between connected node pairs. In this paper, we mainly focus on the delay caused by the lack of instantaneous connectivity which is closely related to the node density in such a netwok. {Cause of Delay Waiting Delay Scheduling and Routing Network Resources Propagation Speed Lack of Instantaneous Connectivity } Propagation Delay (Denoted by  ) Fundamental Relationship between Node Density and Delay in Wireless Ad Hoc Networks with Unreliable Links