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Cloud radio access network (C-RAN) has been shown to reduce both capital and operating expenditures and provide high spectral efficiency (SE) and energy efficiency (EE). High density of remote radio heads (RRHs) deployments results in inefficient energy consumption. Moreover improvements in the battery capacity of mobile devices lag far behind the surging demand for transmit power, which makes power...
The integration of Device-to-Device (D2D) communication into a cellular network improves system spectral efficiency, increases capacity, reduces power consumption and also reduces traffic to the evolved NodeB (eNB). However, D2D communication generates interference to the conventional cellular network which deteriorates the system performance. In this paper, we propose a radio resource allocation...
This paper investigates the joint power and admission control problem for a multi-pair massive multiple-input multiple-output (MIMO) amplify-and-forward relaying system. Our aim is to minimize the total transmit power for users while maximizing the number of supported users by adopting the new linear programming deflation (NLPD) algorithm. Here, the removal strategy of the NLPD algorithm is compared...
Device-to-device (D2D) communication has been proposed as a solution for vehicle-to-vehicle (V2V) communication, which has strict requirements on reliability and latency. Previous works on V2V communication typically assume single-antenna users, which ignore the potential of multiple antennas. By contrast, this paper studies an uplink power control problem in multi-antenna V2V underlay cellular networks...
With the development of wireless transmission technology, the coexistence of a variety of network protocols is inevitable in industrial control networks for a certain period of time. Due to the lack of a necessary coordination mechanism between different network protocols, this may impact the transmission performance of the backhaul network connecting several subnetworks with different protocols when...
Recently, the development of wireless body area network (WBAN) is accelerated due to rapid development of wireless technology. In the WBAN environment, many WBANs coexist where communication ranges overlap with each other, resulting in the possibility of interference. Since many variety of applications exist in the WBAN environment, each prospective user may have different quality of service (QoS)...
The transmitted power of the very first message of access procedure to a 5G network is a relationship of initial power, offset, step power, and a number of re-transmissions. In the current networks, the access procedure is the same, whether or not there is external interference. A high external interference provide a higher probability to have access delay or fail. To mitigate this, the access procedure...
In this paper, we propose two uplink pilot power control schemes to mitigate pilot contamination in a multi-cell massive multiple-input multiple-output (MIMO) system. These uplink pilot power control schemes can maximize the minimum signal-to-interference-plus-noise ratio (SINR) of the worst user or the mean SINR of the whole network for the downlink data transmission. Combinatorial optimization problems...
This paper considers the virtual cell(VC) association and multi cell scheduling in Ultra-Dense Network for sum-rate maximization where multi dimensional resources allocation strategy is coupled and interference environment is complex. For virtual cells association, a metric is proposed which is transformed from the non-convex problem via a series of decouples and captures the gain of multi user diversity...
This paper talks about the most problematic issues brought by interferences in the New Generation Networks and their impact on the network s data throughput with focus on the inter-cell interferences. The most important ways to avoid interferences while planning a network are mentioned. In particular frequency reuse, power control and MIMO antenna arrays. Also, interference regeneration and cancelation...
Same frequency networking (SFN) technology is widely used in modern wireless network to achieve high area spectrum efficiency. However, it brings the inter-cell interference to the users at the cell edge. Frequency allocation and power control is extensively used to diminish the effect of the interference. Most of the researches are focus on the downlink data transmission due to the fact that the...
Virtual cell (VC) is an emergent concept in cellular networks that shifts the base-station-centric point of view to a user-centric one. Instead of traditional base station assignment, VCs contain a number of transmission points with an association pattern that is created for, and moves with, every user in the network. This study targets VCs for vehicle-to-everything (V2X) communications, where V2X...
The increasing demand for underlaying cellular network has benefit form Device-to-Device (D2D) communication, where one need to apply productive plan for resource allocation to increase system capacity and mitigate interference. The bipartite graph matching strategy is used for optimizing the resource allocation among all other strategies; Kuhn-Munkres (KM) is one of algorithm applied to increase...
As in-line interference between geostationary(GEO) and Non-Geostationary(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison...
Device-to-Device (D2D) communication has currently been emerging as a promising technology to increase capacity and to extend coverage area in cellular communication network. D2D communication allows direct communication between two or more devices such as mobile user equipments without any base station help as a relay. However, enabling D2D features in cellular communication network will reveal more...
In this paper, we propose a fairness-aware energy-efficient power control scheme for device-to-device communications underlaying cellular networks, where multiple D2D pairs reuse the same subchannels allocated to one cellular user. Taking the maximum allowed transmit power and the minimum data rate requirement into accounts, we formulate the fairness-aware energy-efficient power control problem as...
A secrecy transmission method with robust power control is investigated in this paper for a downlink two-tier femtocell network, where an eavesdropper attempts to wiretap the legitimate macrocell users. Considering the imperfect channel gains, a probability constraint robust optimization problem is formulated to satisfy the quality-of-service (QoS) of users. We aim to maximize the secrecy rate with...
A decentralized power adjustment scheme based on non-cooperative game theory in a dense heterogeneous femtocell network is studied. Transmission power of the femtocell base stations are adjusted independently in a self-organizing manner to maximize the corresponding utility function, which consists of the signal-to-interference plus noise ratio and the transmission power of the femtocell base stations...
Femtocell is a small cell of 10–30 meters radius deployed in the existing larger cell (macrocell) forming two-tier femtocell-macrocell cellular network. However, the deployment of femtocell into the existing macrocell cellular network is facing more complex interference problems. This paper focuses on interference management using power control methods for the uplink transmission of such two-tier...
Deployment of femtocell in macrocell cellular network which forms two-tier femtocell-macrocell cellular network faces more complicated interference problems, since it uses the same licensed frequency spectrum as its macrocell. This paper addresses the interference problems for downlink transmission in such two-tier cellular communication network. In this paper, interference management using power...
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