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In this paper, we propose a joint power control and resource allocation approach for co-channel deployed femto- and macro-cell networks, denoted as Two-tier Cluster-based Resource and Power Allocation Scheme (TCRPA). The rational behind our proposal is to efficiently mitigate the significant interference faced by indoor users in downlink communications in order to satisfy the resource allocation requirements...
In this paper, a distributed fair algorithm is proposed to address the resource allocation problem in the cognitive femtocell network. The cognitive functionalities equipped in femtocells enable us to effectively identify the qualified resource blocks (RBs), thus we can mitigate inter-cell interference. By exploiting the satisfaction degree and the channel state difference, the proposed distributed...
In this paper, we consider a downlink resource allocation in an Orthogonal Frequency Division Multiple Access (OFDMA) based heterogonous cellular network. In order to use spectrum efficiently, we propose Non-Exclusive Spectrum Allocation scheme (NESA). The considered objective function of the NESA scheme is to maximize the sum rate of macrocell and femtocells subject to maximum transmit power and...
Fourth generation cellular networks use Orthogonal Frequency Division Multiple Access (OFDMA) as the multiple access technique. It allows multiple users to transmit simultaneously on different subcarriers per OFDM symbol, thereby reducing the effect of multipath fading. To enhance indoor coverage and reduce traffic within macrocells, femtocells are introduced. Femtocells can be efficiently deployed...
Femtocell networks are a cost-effective way to deliver the bandwidth needed to support advanced mobile data services in heavily congested urban and indoor locations. Locally-networked femtocell arrays are used to enhance mobile network coverage and capacity in crowded urban and indoor locations. Cluster based femtocell deployments in large indoor environments provide a flexible approach to improve...
As energy saving and environmental protection become an inevitable trend, this paper studied the problem of the efficient resource allocation via power control and interference management approaches for multi-agents in two-tier femtocell networks. In this paper, a distributed power control algorithm is proposed to investigate the resource allocation using hierarchical game for two-tier femtocell networks...
Femtocells tend to be large scale and self-organized, which complicates the interference environment of mobile networks. In this case, interference between femtocells cannot be ignored, casing the restriction of the usage of wireless resources. Meanwhile, traffic classes are booming in recent years, and it is very likely that different traffic types with different QoS demand contend with resources...
Femtocell (FC) is a low-power, low cost indoor cellular base station (BS) installed by an end user at home or in an office environment. A typical indoor coverage of an FC is tens of meters and could cover several rooms. When Femto base stations (F-BS) are densely deployed, interference between them becomes an unavoidable issue. Hence, there is an immediate need for a robust interference management...
Femtocells are designed to cover a short range of area and improve the cellular system capacity in an economically viable way. In this paper, we propose an adaptive sub-band allocation (ASA) scheme for the downlink transmission of the LTE system, which consists of orthogonal sub-band assignment (OSA) algorithm and adaptive sub-band reuse (ASR) algorithm based on the interference graph. The interference...
In this paper, we consider resource allocation in femtocell networks to maximize the throughput while minimizing interference to macro-cell users nearby. This can be achieved by dynamically allocating the spectrum resource in a cognitive radio way of avoiding the use of spectrum resources occupied by macro-users nearby. The proposed scheme comprises two steps; channel sensing and resource scheduling...
Femtocells applied in many existing systems, such as HSPA, 3GPP LTE, WiMAX, and etc, which cover a short range and offer an economically viable way to improve cellular system capacity, have caught world-wide researching interest nowadays. An interference coordination scheme is proposed for LTE downlink in this paper, which is split into three steps named as interference graph creation, orthogonal...
The race toward higher throughputs for cellular network users is getting more difficult everyday. On the one hand cellular network operators wish to increase benefits by offering new services to users, but on the other hand spare radio resource are shrinking away. The spreading of WiFi-3G dual mode devices is making this fight even harder. The new ”Femtocell” technology is expected to be the rescuer...
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