Femtocell Deployment to Minimize Performance Degradation in Mobile WiMAX Systems
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Macrocell
Femtocell
Transmitter power output
WiMAX
Deployment of femtocells (Home eNode Bs) along with existing macrocells has been drawn considerable attention of mobile industry because of its potential to reduce Operational Expenditure to the operators by offloading traffic from macrocell to femtocells. In this paper, we evaluate the energy efficiency of co-channel deployed macrocell-femtocell networks considering centralized control for HeNBs. We also show the impact of macro-cell power configuration on the energy efficiency. The results show that significant amount of improvement in energy efficiency can be achieved by centrally coordinating macrocell and femtocell networks, according to varying traffic load condition without affecting the Quality of Service requirements of macrocell and femtocell users.
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Femtocells have been recently proposed as a potential good solution to increase not only indoor radio coverage, but also system capacity. In this paper, a framework for radio coverage prediction and system level simulation for WiMAX macrocell/femtocell scenarios is presented. Furthermore, the feasibility of the co-channel deployment of WiMAX femtocell in an existing WiMAX macrocell network is investigated, and a method for interference avoidance based on DFP (Dynamic Frequency Planning) is proposed. The resulting impact of DFP in a macrocell/femtocell scenario compared with other frequency assignment strategies is analyzed. Experimental evaluations carried out using our framework show the boost in the system capacity when using DFP and femtocells.
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Femtocell network is a new technology that uses the advantage of an Internet backbone to enhance the cellular coverage in residential or small business areas. However, due to the expected random deployment of the femtocell access point (FAPs), there is a strong probability of interference among the femtocell nodes and between the
femtocells and the macrocell nodes. In this chapter, an interference enhancement for multi-femtocells is developed and designed for two tiers macro-femtocell networks. An
adaptive power control is calculated based on selecting the minimum interference channel with the optimized channel gain. In the simulation a number of the FAPs, the
distance between the macrocell and the femtocell and the path loss between the macrocell node and the FAPs are used as design parameters. The results show a performance enhancement in the interference degradation ratio
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In this paper, we study the reverse link (RL) capacity of a co-channel macrocell-femtocell network, where the macrocell and femtocell networks share the same carrier. The analysis is done based on an outage probability criterion, and we use this analysis further to compare the capacities of different practical multi-carrier macrocell-femtocell deployment strategies.
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This paper proposes a self-optimized coverage coordination scheme for two-tier femtocell networks, in which a femtocell base station adjusts the transmit power based on the statistics of the signal and the interference power that is measured at a femtocell downlink. Furthermore, an analytic expression is derived for the coverage leakage probability that a femtocell coverage area leaks into an outdoor macrocell. The coverage analysis is verified by simulation, which shows that the proposed scheme provides sufficient indoor femtocell coverage and that the femtocell coverage does not leak into an outdoor macrocell.
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Access configuration of femtocell networks carries critical importance due to the resulting interference scenarios. Especially in closed-access femtocell networks, there might be significant interference between the femtocell and the macrocell users. In this paper, we evaluate the capacity of closed access femtocell networks employing various dynamic spectrum reuse techniques. When there is a macrocell user in the vicinity of a femtocell, the femtocell may dynamically decide not to reuse the spectrum of the macrocell user to avoid interference. We discuss and evaluate the following three decision criteria for this purpose: maximum sum capacity, minimum macrocell loss, and minimum effective interference. Computer simulations in realistic settings are provided to demonstrate possible gains with the proposed methods.
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Femtocells deployed in the Macrocell to improve the indoor coverage share the same spectrum with the Macrocells. The dynamic spectrum access (DSA) and power allocation (PA) for the users of Femtocells and Macrocells has an important influence on the mutual interference and system performance in Femtocell networks. In this paper, the DSA and PA problem is first modeled as an optimization problem. Then, we study and obtain the upper bound of the interference intensity among Femtocells, which is showed to be very small. By ignoring this slight interference, a simplified model is derived, and its near-optimal solution is obtained by utilizing the 'time-sharing' property. A distributed DSA and PA algorithm is proposed based on the solution. This algorithm only requires a little information exchange, and the complexity grows linearly with the multiplication of the number of Femtocells and channels. Simulation results show that this algorithm can reduce the interferences suffered by Macrocell users and increase the supportable number of Femtocells significantly.
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Macrocell
Femtocell
Transmitter power output
WiMAX
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Femtocell network is a new technology that uses the advantage of an Internet backbone to
enhance the cellular coverage in residential or small business areas. However, due to the expected
random deployment of the femtocell access point (FAPs), there is a strong probability of interference
among the femtocell nodes and between the femtocells and the macrocell nodes. In this paper, an
interference enhancement is developed and designed for two tiers macro-femtocell networks. An
adaptive power control is calculated based on selecting the minimum interference channel with the
optimized channel gain. In the simulation a number of the FAPs, the distance between the macrocell
and the femtocell and the path loss between the macrocell node and the FAPs are used as design
parameters. The results show a performance enhancement in the interference degradation ratio (DR).
Macrocell
Femtocell
Transmitter power output
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Citations (2)
Femtocells (HeNB) are deployed within macrocell coverage area to increase performance of indoor user. In order to cover, all indoor users, HeNBs make a network, known as femtocell network. Since, HeNBs use same spectrum, they are causing interference on both MeNB users (MUE) and among HeNB users (HUE). The performance of the femtocell network depends on the SINR of HUEs of respective HeNBs, which eventually depends on the interference produced on it. In order to improve the performance, we need to minimize the interferences among themselves. In this paper, we first study the SINR performance of HUEs in the macrocell environment. We also analyze the outage probability in femtocell network. Finally, we consider the power consumption issue of femtocell network.
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