06717210.pdf - 1208 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS VOL 13 NO 3 MARCH 2014 Femtocell Access Strategies in Heterogeneous Networks using a

06717210.pdf - 1208 IEEE TRANSACTIONS ON WIRELESS...

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1208 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 13, NO. 3, MARCH 2014 Femtocell Access Strategies in Heterogeneous Networks using a Game Theoretical Framework Jia-Shi Lin and Kai-Ten Feng, Senior Member, IEEE Abstract —In recent years, femtocell plays an important role in wireless networks not only for its spectrum reuse but also for its low power consumption. However, there exist several critical issues that need to be investigated, especially for the interferences between the macrocell BSs (mBSs) and femtocell BSs (fBSs). The level of interference mainly depends on the access strategies of fBSs. Two major access policies are considered in femtocell network, including the closed access mode and open access mode. The closed access mode only permits authorized subscribers to utilize the fBS; while all users are allowed to connect to the fBS by adopting the open access mode. Closed access will intuitively be advantageous to the femtocell subscribers, however, interference from the fBS to mBS’s users can become severe in the closed access mode than in open access mode. System performance of the entire heterogeneous network (HetNet) can be improved if fBS is operated in the open access mode. In order to relax the inflexible access strategies, hybrid access policy is considered in this paper which allows nonsubscribers to possess limited connections to the fBS. Two cell selection games for distinct scenarios are theoretically modeled to formulate the behaviors of nonsubscribers, and the existences of pure strategy Nash equilibria are also proven under feasible utility functions. From the perspectives of subscribers, HetNet system, and operator, numerical results suggest the adoption of hybrid access mode to provide higher flexibility for the performance enhancement. Index Terms —Heterogeneous networks, femtocell access, game theory. I. I NTRODUCTION L ONG-TERM evolution-advanced (LTE-A) techniques are proposed by the 3 rd generation partnership project ( 3 GPP) to provide higher spectrum efficiency and data rate. According to the technical report from 3 GPP [1], the downlink and uplink peak data rates are respectively required to achieve 1 Gbps and 500 Mbps in order to fulfill the quality-of-service (QoS) requirement for the user equipment (UE). For achieving these objectives, imposing additional low-power base stations (BSs) into the original networks naturally becomes a feasible solution for increasing the spectrum efficiency and data rate. On the other hand, according to the statistical data in [2], it is expected that there will be nearly 90% of data services and 60% of phone calls taken place in indoor environments. Hence, Manuscript received October 27, 2012; revised March 28 and June 21, 2013; accepted November 1, 2013. The associate editor coordinating the review of this paper and approving it for publication was P. Wang.
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  • Summer '18
  • Fahad Bin Zamal

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