應用賽局理論分析毫微型蜂巢式系統之頻譜分配

Abstract

隨著行動通訊資料量爆炸性的成長，毫微型蜂巢式系統的技術將是增加行動通訊網路服務品質和整體系統容量一種適當的解決方案。然而對設置毫微型蜂巢式系統，最主要的問題就是找到一種最適合的存取模式，讓營運商和使用者都願意使用。在所有的存取模式中，混合式存取模式被認為是最適合的一種，因為它可以對毫微型蜂巢式系統基地台的擁有者和註冊者提供較優先的服務而僅提供其他非註冊者一定限制的服務。因為所有毫微型蜂巢式系統基地台的擁有者都是自私的，因此如何提供足夠的動機給予給該基地台擁有者，讓它願意開放部分基地台的資源是一件相當困難的事情。在我們的論文中，我們建構一種經濟學的架構，該架構利用賽局理論來分析營運商和毫微型蜂巢式系統的使用者，而且引進利益分享的概念，使得營運商和使用者對於使用毫微型蜂巢式系統服務產生正向循環。在我們的架構中，我們設計一種毫微型蜂巢式系統的賽局，其中毫微型蜂巢式系統基地台的擁有者可以決定分享給其他非註冊者頻寬的比例，而營運商則可藉由決定分享利潤給予基地台擁有者的比例讓自己的收益最大化。最後我們證明在我們的賽局中，奈許均衡是存在且唯一的。後面的模擬會顯示出在我們設計的架構下，營運商的利潤在各使用者都能維持自己的服務的要求下達到最大化。

With the explosive growth of mobile data traffic, the femtocell technology is one of the proper solutions to enhance mobile service quality and system capacity for cellular networks. However, one of the key problems for femtocell deployment is to find appropriate access control in which mobile operators and users are willing to be involved. Among all kinds of access control modes, the hybrid access mode is considered as the most promising one, which allows femtocells to provide preferential access to femtocell owners and subscribers while other public users can access femtocells with certain restriction. Since all femtocell owners are selfish, how to provide enough incentives to the owners for sharing their femtocell resources is challenging. In this paper, we construct an economic framework for mobile operator and femtocell users by a game theoretical analysis, and introduce the concept of profit sharing to provide a positive cycle to sustain the femtocell service. In this framework, a femtocell game is formulated, where the femtocell owners determine the proportion of femtocell resources shared with public users while the operator can maximize its own benefit by determining the ratio of revenue distribution to femtocell owners. The existence and uniqueness of the Nash Equilibrium of the game are analyzed. Extensive simulations are conducted to show that the profit of the operator can be maximized while the service requirements of users can be maintained by the proposed framework.