【摘 要】
:
In this paper,we investigate the trade-offs between delay and capacity in mobile wireless networks with infrastructure support.We consider three different mobil
【机 构】
:
State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing 210046,China;School of
论文部分内容阅读
In this paper,we investigate the trade-offs between delay and capacity in mobile wireless networks with infrastructure support.We consider three different mobility models,independent and identically distributed (i.i.d) mobility model,random walk mobility model with constant speed and Lévy flight mobility model.For i.i.d mobility model and random walk mobility model with the speed θ(1/√n),we get the theoretical results of the average packet delay when capacity is θ(1),θ(1/√n) individually,where n is the number of nodes.We find that the optimal average packet delay is achieved when capacity λ(n) <(1/2·n·log2(1/1-e-k/n+1)’) where K is the number of gateways.It is proved that average packet delay D(n) divided by capacity λ(n) is bounded below by (n/k·w.) When ω(√n) ≤ K < n,the critical average delay for capacity compared with static hybrid wireless networks is θ(K2/n).Lévy flight mobility model is based on human mobility and is more sophisticated.For the model with parameter a,it is found that( D(n)/λ(n)) > O(n(1-η)·(α+1/2)㏑n) when( K=O(nη) (0 ≤ η< 1).We also prove that when ω(√n) ≤ K < n,the critical average delay is θ(nα-1/2·K).
其他文献
An unsteady three-dimensional analysis of the ventilation performance is carried out for different ventilation strategies to find out a ventilation method with
The numerical simulation of the self-propelled motion of a fish with a pair of rigid pectoral fins is presented.A Navier-Stokes equation solver incorporating wi
As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmis
Objective:To evaluate the efficacy and safety of nedaplatin/gemcitabine (NG) and carboplatin/gemcitabine (CG) in the management of untreated advanced non-small
The simulation model Tunev(tunnel evacuation) was developed for people’s evacuation in tunnel fire. It contains simple database of the people’s behavioral rea
The front abutment pressure of a fully-mechanized workface of 11061 soft coal isolated island of Liangbei Coal Mine was measured and studied using a self-develo
The finite volume method based on a multiphase model is adopted to solve the Reynolds-Averaged Navier-Stokes (RANS)equations,which takes into account the effect
A Lattice Boltzmann Method (LBM) with two-distribution functions is employed for simulating the two-phase flow induced by a liquid droplet impinging onto the fi
The inner flow analysis of centrifugal pumps has gradually become an important issue for the hydraulic design and performance improvement.Nowadays,CFD simulatio
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7