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In heterogeneous networks (HetNets), the load between macro-cell base stations (MBSs) and small-cell BSs (SBSs) is imbalanced due to transmit power disparities and ad-hoc deployment of SBSs. This significantly impacts the system performance and user experience. Associating more users to the SBSs is an effective way to solve this problem. In this paper, we formulate the user-BS association problem...
Dynamic Time-division duplex (TDD) can provide efficient and flexible splitting of the common wireless cellular resources between uplink (UL) and downlink (DL) users. In this paper, the UL/DL optimization problem is formulated as a noncooperative game among the small cell base stations (SCBSs) in which each base station aims at minimizing its total UL and DL flow delays. To solve this game, a self-organizing...
Considering environment protection and cost-efficiency, cloud radio access network (C-RAN) has received considerable attention. In C-RAN, centralized baseband units (BBUs) are composed of high-capacity processing units and realtime virtualization, so the BBU can control resource allocation according to the distribution of users, which will keep the system work with the highest bandwidth efficiency...
Multi-agent movement is disturbed by all kinds of interference from the complex environment. For second-order multi-agent system with interference, a distributed control protocol with individual local information is proposed, and the sufficient condition is obtained to ensure the flocking motion and the synchronization speed when multi-agent system is disturbed by outside world. Finally, simulation...
Biasing cell association (BCA) is an effective and easy-to-implement load balancing technology in small cell networks (SCN). The existing studies are mainly respect to the static BCA strategy which is not appropriate for the non-uniform traffic distribution scenarios. In this paper, we address the problem of load balancing in SCN where the small cell base stations (SCBSs) are underlaid deployed within...
With the fast development of mobile terminals and wireless communication networks, mobile social networks (MSNs) play an important role in everyday lives to access social activities. However, most research on MSNs typically focuses on the relations of the users' physical location, but not make sufficient use of social ties. Consequently, in this paper, we consider a scenario of MSNs with online social...
Future wireless communication systems feature heterogeneous networks (HetNets), with small cells underlying existing macrocells. In order to maximize the off-loading benefits of small cells and mitigate the interference from the macrocell tier to the small cell tier, cell range expansion (CRE) and almost blank subframes (ABSs) have been designed for small cells and macrocells, respectively. Besides,...
In Orthogonal Frequency Division Multiple Access (OFDMA) networks there is variation of Grade of Service (GoS) experienced by the users within a cell. Hence a comprehensive performance analysis for such networks must include fairness of GoS considerations. Methods to enhance fairness of GoS include call admission control (CAC) schemes. A simple dynamic CAC scheme that responds to the bandwidth occupancy...
In the recent cellular network environment, data traffic has increased rapidly by virtue of the development of a wide variety of wireless technology, such that it is hard for mobile service providers to satisfy the QoS (Quality of Service) requirement. In the real-world, users are not evenly distributed throughout cells; the base stations with multiple users have a great deal of difficulty of limited...
Device-to-Device (D2D) communication has become an attractive alternative in bringing popular mobile video contents much closer to the end users. However resulting interference caused by the direct communicating D2D pair demands sufficient resources as well as proper admission control mechanisms for the corresponding mode. To resolve these issues, in this paper, we suggest how source and destination...
As one of the key technologies for next generation wireless communication systems, Device-to-Device (D2D) communication is able to offer several benefits, e.g. low end-to-end latency and traffic offload. In particular network controlled D2D operation underlaying the primary cellular system, e.g. LTE, and reusing its radio resources, is seen as an appealing option for increasing system capacity. However,...
Cloud radio access network (C-RAN) is a new concept of network architecture, which brings a technical revolution into the wireless communication market and leads to some kind of all new mode of the future wireless communications. In this paper the clustering algorithm based on multi-objective optimization is investigated. The proposed algorithm aims at maximizing the throughput contribution of the...
Clustering is a promising interference mitigation scheme in dynamic TDD systems. However, most previous works just took large-scale path loss or coupling loss as criteria of the clustering schemes, thus the throughput performance would be limited by the varying traffic requirements among different small cells within one cluster. In this paper, a novel dynamic cluster-based Interference Mitigation...
We present the Dynamic Inhibition Areas Reaction-Diffusion (DIA-RD) algorithm, a distributed medium access control protocol that globally maximizes the spatial reusability (number of simultaneous transmissions per unit area) of wireless sensor networks. This algorithm is able, in consequence, to minimize the number of time slots needed to schedule the set of demanded links, making it very efficient...
This paper focuses on mitigation of cross-tier and co-tier interference for dense deployment of the femtocells (FAPs). We propose a centralized dynamic radio resource allocation scheme exploiting graph theory approach. The FAPs either utilize an overlapping allocation mode (OAM) or a non-overlapping allocation mode (NAM). The allocation mode is dynamically selected by a control unit (CU) depending...
In this work, we consider a cellular cell with D2D links being activated. Besides, the transmission scheme is assumed to be OFDM. With the underlay in-band spectrum sharing scheme, the D2D links can access the spectrum occupied by the cellular links. Hence, the D2D links may interfere with the existing cellular links. Moreover, since the D2D links' channels could overlap, the D2D links are modeled...
Device-to-device (D2D) communications is being pursued as an important feature in next generation cellular networks. D2D can improve resource utilization in two ways: Offloading cellular traffic to D2D, and Reuse of resources used by conventional cellular transmissions for D2D communication. In this paper, we show that in multi-cell environments that employ FFR (Fractional Frequency Reuse), the benefits...
Cellular systems using Coordinated Multi-Point (CoMP) transmissions leveraging clusters of spatially distributed radio antennas as Virtual Base Stations (VBSs) have the potential to realize overall throughput gains and, perhaps more importantly, can deliver substantial enhancement to poor performing “edge” users. In this paper we propose a novel framework aimed at fully exploiting the potential of...
Game-theoretic modeling and equilibrium analysis have provided valuable insights into the design of robust local control rules for the individual agents in multi-agent systems, e.g., Internet congestion control, road transportation networks, etc. In this paper, we introduce a non-cooperative MAC (Medium Access Control) game for wireless networks and propose new fully-distributed CSMA (Carrier Sense...
Fair resource allocation in OFDMA networks is studied in this paper. We propose a distributed algorithm requiring minimum inter-cell information that embodies the principle of balancing advantaged and disadvantaged user traffic flows. A simple interference deterministic channel model assuming zero queuing delay is used. We propose a hybrid power and bandwidth allocation algorithm. A two-dimensional...
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