Journal of Computer Applications ›› 2019, Vol. 39 ›› Issue (8): 2346-2353.DOI: 10.11772/j.issn.1001-9081.2019010141

• Network and communications • Previous Articles     Next Articles

Successful offloading probability analysis in device-to-device caching network based on stochastic geometry

LONG Yanshan1,2, FU Qinxue1, GUO Jibin1, ZHANG Mengqi3, CAI Yueming1   

  1. 1. College of Communications Engineering, Army Engineering University, Nanjing Jiangsu 210007, China;
    2. 61416 Force, Beijing 100000, China;
    3. Navy 91208 Force, Qingdao Shandong 266100, China
  • Received:2019-02-13 Revised:2019-03-21 Online:2019-08-10 Published:2019-04-17
  • Supported by:
    This work is partially supported by the National Natural Science Foundation of China (61671474), the Jiangsu Provincial Science Fundation for Excellent Young Scholars (BK20170089).


龙彦汕1,2, 富勤学1, 郭继斌1, 张孟其3, 蔡跃明1   

  1. 1. 陆军工程大学 通信工程学院, 南京 210007;
    2. 61416部队, 北京 100000;
    3. 海军 91208部队, 山东 青岛 266100
  • 通讯作者: 龙彦汕
  • 作者简介:龙彦汕(1989-),女,山东荣成人,工程师,博士,主要研究方向:终端直传(D2D)缓存网络、随机几何、资源管理;富勤学(1980-),男,内蒙古乌兰察布人,博士研究生,主要研究方向:D2D缓存网络、资源管理;郭继斌(1973-),男,河北唐山人,讲师,硕士,主要研究方向:协同通信、资源分配;张孟其(1985-),男,河北邯郸人,硕士,主要研究方向:舰艇通信、海洋战略;蔡跃明(1961-),男,福建永泰人,教授,博士,主要研究方向:协同无线网络、信号处理。
  • 基金资助:

Abstract: In the Device-to-Device (D2D) caching network where mobile user terminals are all cache-enabled, the spatial distributions of all users were modeled as the Homogeneous Poisson Point Processes (HPPP). On this basis, combined with the randomness of content caching and requesting, the network interference was analyzed exactly and then approximately under specific scenarios. Considering that the D2D caching technique has the dual characteristics of both caching at terminals and D2D communications, which means that the content offloadeding includes self-offloading way and D2D-offloading way, and the content transmission has to meet the constraints of received Signal-to-Interference Ratio (SIR) and D2D maximal communication distance simultaneously, the closed-form expressions of Successful Offloading Probability (SOP) of the random D2D caching network was deducted. Simulation results show that the proposed SOP is a general metric and can be reduced to the special cases of existing research results. For example, when the users are distributed densely and the D2D maximal communication distance is relatively large, the SOP is reduced to the Successful Transmission Probability (STP) without considering the D2D distance constraint.

Key words: Device-to-Device (D2D) caching network, network interference, successful offloading probability, self-offloading, stochastic geometry

摘要: 针对所有移动用户均具有缓存能力的终端直传(D2D)缓存网络,将移动用户的位置分布建模为均匀泊松点过程(HPPP),并在此基础上结合内容缓存和内容请求的随机性,对网络干扰进行了精确分析和特定场景下的近似分析。考虑到D2D缓存技术融合了用户终端缓存与D2D通信的双重特点,即内容卸载包括自卸载和D2D卸载两种卸载方式、内容传输需要满足接收端信干比(SIR)和D2D距离的双重约束,利用随机几何理论推导出D2D缓存网络的成功卸载概率(SOP)的闭式表达式。仿真结果表明,结合D2D缓存网络特点的SOP更具有一般性,在特定场景下可以退化成已有研究中的特例。例如,在用户密集分布以及D2D最大通信距离较大的情况下SOP会退化成不考虑D2D距离约束的成功传输概率(STP)。

关键词: 终端直传缓存网络, 网络干扰, 成功卸载概率, 自卸载, 随机几何

CLC Number: