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In this paper, we propose an efficient resource allocation scheme for an integrated satellite/terrestrial network. The proposed scheme is a frequency sharing technique to mitigate its inter-component interferences which can be generated between the satellite beam and terrestrial cells that are operated in the same frequency. The proposed dynamic resource allocation scheme can mitigate the total inter-component...
The Long Term Evolution (LTE) broadcast is a promising solution to cope with exponentially increasing user traffic by broadcasting common user requests over the same frequency channels. In this paper, we propose a novel network framework provisioning broadcast and unicast services simultaneously. For each serving file to users, a cellular base station determines either to broadcast or unicast the...
Femto cell system is promising to provide cost effective strategy for high data traffic and high spectral efficient services in future wireless cellular system environment. However, the co-channel operation with current Macro networks occurs some severe interference between Macro and Femto cells. Hence, the interference cancellation or management schemes are imperative between Macro and Femto cells...
As white space, unused local TV spectrum, will be allowed for the broadband Internet access, we can use white space network as the supplementary network of licensed and/or unlicensed access networks such as cellular and WiFi™ networks. Thus, after setting up the connection over a cellular or WiFi™ system, mobile devices equipped with a white space interface will connect to a radio resource management...
In IEEE 802.16j-based relay networks, frequency reuse by RS(Relay Station)s and BS(Base Station) is considered as a way to improve the frequency utilization. However, since the same frequency band is used by RSs and BS, MS located in the middle between neighboring transmitting stations suffer severe interference or even outage. This co-channel interference within a cell is a major bottleneck in providing...
This paper investigates LTE-Advanced uplink technologies. In order to support several requirements of LTE-Advanced, we propose new architecture and scheduling grant information. The link performance of LTE-Advanced is evaluated by MMSE in the uplink single user spatial multiplexing with two transmit antennas. Our simulation results show that the target peak data rate of LTE-Advanced uplink exceeds...
Femtocell is one of promising key technologies to increase the efficiency and coverage of next generation broadband wireless networks. However, there exists interference problem between femtocells and macrocell due to co-channel operation. In this paper, we propose an efficient frequency resource allocation scheme for newly deployed femtocells in the legacy OFDMA networks in order to maximize the...
In IEEE 802.22 Wireless Regional Area Networks (WRANs), each Base Station (BS) solves a complex resource allocation problem of simultaneously determining the channel to reuse, power for adaptive coverage, and Consumer Premise Equipments (CPEs) to associate with, while maximizing the total downstream capacity of CPEs. Although joint power and channel allocation is a classical problem, resource allocation...
Cognitive radio networks can be designed to manage the radio spectrum more efficiently by utilizing the spectrum holes in primary user's licensed frequency bands. The currently available unlicensed spectrum is reaching its limit and various demands for applications and data rates in wireless communications requires additional spectrum which imposes limits on spectrum access. These requirements demand...
In this paper, we present a method to optimally manage the access slots for the initial ranging contention process in IEEE802.16e air interface. In conventional method, the number of the initial access slot is fixed to a large number in common circumstance. The reason using the static large slot is to reduce the initial access collisions by slot contentions of the mobile terminals. Therefore the usage...
The limitation of existing fixed channel allocation caused the degradation on overall throughput of the wireless local area network (WLAN). This paper proposes a variable channel allocation technique based on the bandwidth requirement and quality of service (QoS) of the network. According to this paperpsilas proposal, the distributed system (DS) of WLAN distributes the available frequency band to...
The problem of efficiently shaping downlink data bursts into rectangles and packing them in the OFDMA subframe is not addressed by the IEEE 802.16 standard, and is left as an implementation issue. In this paper, we propose a linear complexity bursts packing algorithm to maximize radio resources usage on the OFDMA downlink. Our scheme shapes the bursts into identical width, places them in column direction...
Conflict free spectrum allocation for secondary users in cognitive networks is a challenging problem, since the accessible spectrum is shared among users. The problem becomes to be especially difficult when it is wanted to get the maximum utility of the system considering access fairness among users. In this paper, a novel method using bipartite graph matching is proposed to approach this target,...
We investigate the dynamic spectrum sharing problem among primary and secondary users in a cognitive radio network subject to QoS constraints for secondary users and interference constraints for primary users. For a scenario where only mean channel gains from secondary users to primary receiving points, which are averaged over short-term fading, are available, we derive outage probabilities for secondary...
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