在LTE-Advanced网络下的Device-to-Device通信

Device-to-Device（D2D）通信是一种在系统的控制下,允许终端之间通过复用小区资源直接进行通信的新型技术,它能够增加蜂窝通信系统频谱效率,降低终端发射功率,在一定程度上解决无线通信系统频谱资源匮乏的问题。与其他应用于非许可频段的同类技术相比,D2D具有干扰可控等优点。文章对D2D技术原理进行了介绍,阐述了它应用的必要性和应用场景、它对比同类技术的优点,以及在应用中的关键问题。     

Joint Relay Selection and Power Allocation for Cooperative Cellular Networks

The principal purpose of this paper is to develop a joint relay selection and power allocation algorithm in cooperative cellular networks with multiple users assisted by multiple relays. By solving a rate optimization problem, we can obtain the optimal solutions and the distributed implementation based on the primal-dual decomposition. An admission control algorithm is also presented when there exists the minimal rate requirement for each user. Simulation results indicate that the algorithm with joint design is superior to the existing ones with isolated design in large total transmission rates and small deviations. Moreover, with the admission control algorithm, the rate requirements for users participating in cooperation are also satisfied.     

Effective Interference Cancellation Schemes for Device-to-Device Multicast Uplink Period Underlaying Cellular Networks

Device-to-Device (D2D) multicast will become an important technology with the increasing requirements of local communication services in future networks. To increase the overall capacity and improve resource utilization, a novel interference coordination scheme is proposed. The proposed scheme includes three steps. First, in order to mitigate the interference from D2D multicast transmission to cellular networks (CNs), a dynamic power control scheme is proposed that can determine the upper bound of D2D transmitter power based on the location of Base Station and areas of adjacent cells from the coverage area of D2D multicast group. Next, an interference limited area control scheme that reduces the interference from CNs to each D2D multicast receiver is proposed. The proposed scheme does not allow the coexistence of cellular equipments (CUEs) located in the interference limited area to reuse the same resources as the D2D multicast group. Then two resource block (RB) allocation rules are proposed to select the appropriate RBs from a candidate RB set for D2D multicast group. From the simulation results, it is confirmed that the proposed schemes improve the performance of the hybrid system compared to the conventional ways.     

Hybrid Resource Allocation Scheme in Multi-hop Device-to-Device Communication for 5G Networks

Wireless Personal Communications - The 5G communication paradigm provides architecture of coexistence of device-to-device (D2D) communication with the current cellular communication. Direct D2D...     

终端直通技术中通信系统模式的研究

随着移动通信的不断发展,5 GHz以下带宽分配已经十分拥挤,由于可用于移动通信的频谱资源有限,为满足无线通信发展的需要,可以用终端直通技术(D2D,Device-to-Device)来提高频谱利用率,并可以减少和基站通信的负担,这是新一代无线通信发展的趋势。但是在D2D通信系统中所选择的模式是十分关键的问题。这里给出了蜂窝模式和直通模式这2种通信模式,为了能更好地选择D2D的工作模式,通过仿真比较了这2种模式性能的优劣。     

Differential Game for Distributed Power Control in Device-to-Device Communications Underlaying Cellular Networks

Wireless Personal Communications - In the formulating of power control for wireless networks, the radio channel is commonly formulated using static models of optimization or game theory. In these...     

Distributed Power Control for Energy Conservation in Hybrid Cellular Network with Device-to-Device Communication

Device-to-Device （D2D） com- munication has been proposed as a promising implementation of green communication to benefit the existed cellular network. In order to limit cross-tier interference while explore the gain of short-range communication, we devise a series of distributed power control （DPC） schemes for energy conservation （EC） and enhancement of radio resource utilization in the hybrid system. Firstly, a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint. Then, biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system. Upon feasibility, a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency （SE）. The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.     

基于QoS和干扰温度约束的多用户认知无线电网络最优功率分配(英文)

Power allocation is an important issue for Cognitive Radio Networks(CRNs),since it needs to consider the Quality of Service(QoS) for Secondary Users(SUs) while maintaining the interference power to Primary User(PU) below the Interference Temperature(IT) threshold. In this paper, based on Euclidean projection, we propose a distributed power control algorithm with QoS requirements to minimise the total power consumption of SUs under the time-varying channel scenario. Considering the maximum transmit power constraints and the minimum signal to interference plus noise constraints for each SU, together with the IT constraints for each PU, the power allocation problem is transformed into a convex optimization problem without auxiliary variables, and is solved by the Lagrangian dual method with less information exchange.Simulation results demonstrate that the proposed scheme is superior to the Iterative Water-Filling Algorithm(IWFA).     

Outage Performance Analysis for Device-to-Device Communication Underlying Small Cell Networks with Wireless Power Transfer

Device-to-Device (D2D) communication and wireless small cell networks (SCNs) are two of the most promising paradigms in next generation cellular technologies. However, interference management is a major issue in regard to the use of either or both technologies. In this paper, we propose a D2D pair underlying SCNs using Wireless Power Transfer (WPT) technology. In particular, we have a D2D transmitter and D2D receiver underlying SCNs and operate in close proximity to a SCN primary user (PU). Two scenarios are proposed. The first scenario is when the best base station (BS) link is chosen to harvest energy from, and a second scenario where energy is harvested from all available SCN BSs. The transmission between the D2D pair is kept under a certain threshold so it could not have any harmful effects on the transmission link of PU. The results reveal that the number of interference users shows negative effect on the performance of the considered system. Besides, the primary network’s peak interference constraint has significant influence on the optimal value of energy harvesting time at the D2D transmitter.     

Integrated Optimal Cell Site Selection and Frequency Allocation for Cellular Radio Networks

Two major planning problems are encountered when designing a cellular radio network. The initial question is where to locate the base transmitter stations such that full coverage is achieved at low interference. This is relevant for frequency division (FDMA) as well as code division multiple access (CDMA) technology. If the locations of base stations are given, then for an FDMA-system frequencies have to be assigned such that there is a sufficient number of channels per cell available at a low total interference level. Since cell site selection and frequency allocation have mutual influences on each other, the ultimate goal is to deal with both problems in a single design step. The main intention of this paper is to model the above planning issues as linear integer programs, and to discuss solution methods for the corresponding NP-hard problems. According to their increasing complexity we proceed from channel allocation via cell site selection to an integrated single setup.     

Joint Relaying Selection and Power Allocation Algorithms for Cooperative Cellular System

1IntroductionWireless communications have rapidly evolved in therecent decades[1]. An architecture based on introducingcooperative relayingtechnologiesintothe cellular infras-tructure[2 ~5],seems a solution which addresses futuretoughened requirements with respect to particular datarate and range by alleviating some of the shortcomingsof today s cellular concept .Repeateris asi mple coopera-tive relaying scheme with low complexity[6 ~7], whichcan be the Non-Regenerative Relaying Station (NR…     

Joint Spectrum Allocation and Relay Selection in Cellular Cognitive Radio Networks

Cognitive Radio Network (CRN) has been proposed in recent years to solve the spectrum scarcity problem by exploiting the existence of spectrum holes. One of the important issues in the cellular CRNs is how to efficiently allocate primary user (PU) spectrum inside a CRN cell without causing harmful interference to PUs. In this paper, we present a cross-layer framework which jointly considers spectrum allocation and relay selection with the objective of maximizing the minimum traffic demand of secondary users (SUs) in a CRN cell. Specifically, we consider (1) CRN tries to utilize PU spectrum even when the CRN cell is not completely outside the protection region of the PU cell, and (2) cooperative relay is used in cellular CRNs to improve the utilization of PU spectrum. We formulate this cross-layer design problem as a Mixed Integer Linear Programming (MILP) and propose a low complexity heuristic algorithm to solve it. Compared to a simple channel allocation scheme, the numerical results show a significant improvement by using our proposed method and the performance is close to the optimal solution. We further consider the spectrum allocation among several CRN cells with the objective of maximizing the overall minimum throughput of all cells while ensuring each individual cell’s minimum throughput requirement. A low complexity algorithm is proposed to achieve the objective with satisfactory performance.     

Dynamic Channel Allocation to Interfered Cellular Networks

A channel allocation (CA) method is proposed that allocates frequency channels to the cells of a mobile network taking into account the frequency reuse pattern employed and the interference caused by neighboring TV broadcasters. The proposed CA is optimal in the sense that it maximizes channel utilization and at the same time achieves a very high level of fairness among the network users. The proposed method is implemented employing a Genetic Algorithm based iterative scheme. Due to its reduced computational complexity, the practical application of the proposed CA scheme is characterized by short completion time. To increase granularity the method can be extended to incorporate adaptive coding and modulation. It can also handle uncommon traffic conditions by dynamically reallocating channels to emergency cells.     

Resource and Power Allocation for OFDM-Based Device-to-Device Communications in a Multicell Environment

Journal of Communications Technology and Electronics - We investigate the optimal resource and power allocation for device-to-device (D2D) communications in a multicell environment. When D2D links...     

Resource Allocation Based on Hierarchical Game for D2D Underlaying Communication Cellular Networks

Wireless Personal Communications - The paper studies the device-to-device (D2D) underlaying communication in the case of sufficient spectrum resources available in cellular networks. A hierarchical...     

Novel Scheduling Based Intelligent Video Streaming for Device-to-Device Communication in Wireless Networks

Wireless Personal Communications - This paper proposes a novel scheduling based intelligent video streaming for device-to-device communication in wireless networks with the consideration of...