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Carrier Aggregation (CA) is a promising solution to enhance peak throughput in LTE-Advanced or Small Cells Networks (SCN). Thanks to this technique, a terminal becomes able to transmit on one or multiple component carriers. However, many issues in terms of radio resource allocation and mobility should be addressed. In this paper, we aim at improving carrier component allocation during inter-cell handovers...
WiFi is currently the most widely used communication standard over wireless LAN . Facing the trend that broad band and networking quality are emphasized, the IETF SIGTRAN working group and IEEE 802.11standards working groups proposed a new-generation communication protocol, stream control transmission protocol (SCTP) and wireless LAN communication standard, IEEE 802.11ac/VHT for transport layer and...
We investigate the coexistence issue between 802.22 and 802.11af networks over the TV White Space (TVWS). The coexistence scheme is vulnerable to selfish attacks. In this paper, the scenario of selfish attack wherein 802.22 subscribers intend to occupy the allocated spectrum selfishly is studied. Consequently, 802.11af users have less opportunity to access the spectrum, which leads to low overall...
This paper studies the problem of joint allocation of transmission power and bandwidth in cooperative networks. The goal is to minimize transmission energy consumption in a network with M coordinated transmission points (CTPs) under respective data rate constraints of N mobile terminals (MTs). We propose a joint power and bandwidth allocation scheme for downlink data transmission based on mathematical...
In order to realize practical dynamic spectrum access (DSA), implementing spectrum sensing with reasonably low cost is very challenging due to the required detection accuracy and quickness. For this issue, we have introduced an extended DSA, smart spectrum access (SSA), where any useful information in terms of spectrum utilization, such as statistics regarding spectrum utilization, is used not only...
In this paper, we study and optimize the energy efficiency performance of heterogeneous network (HetNet) with the help of self-organized network (SON). Firstly, we propose a new and general power model for different types of base stations (BSs), where the impact of system load (including power load and bandwidth load), antenna port, carrier number, as well as the power supply and cooling system, is...
In this paper, we propose a distributed load balancing algorithm with adaptive bias adjustment for LTE/LTE-A HetNets. We have formulated the problem as a local sum utility maximization. The distributed algorithm is capable of fairly distributing the load among base stations with a minimum level of coordination. The performance of the algorithm was evaluated with a network topology subject to the conditions...
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