家用基站及其实现技术

本文简要描述了家用基站的概念，家用基站面临的挑战：包括网络演进。射频管理．同步，指配及切换。最后，在简述家用基站设备技术的基础上，介绍了一种低成本的实现方式。     

基于移动宏用户距离估计的家庭基站功率控制

家庭基站是一种可在室内灵活配置、低功率的无线接入点,能够以较低功率为用户提供大带宽、高速率的服务.而家庭基站的密集部署产生了干扰问题,如何有效地管理干扰是当前家庭基站研究的关键问题.在一个移动宏用户穿越家庭基站覆盖范围的场景中,以保障其SINR为目的,设计了一种估计其与家庭基站距离来控制功率的方案,并通过仿真证明其有效性.     

CDMA Femtocell标准及关键技术

首先阐述了CDMA Femtocell标准的制定历程和发展现状,再从应用和开发的角度出发,对CDMA Femtocell网络架构和关键技术进行深入分析。对3GPP2标准中未明确但十分重要的内容,如汇聚管理、移动性管理等给出具体实现方案,有益于Femtocell产品开发和实现。     

Enabling next generation small cells through femtorelays

Today’s society is driven by ever-growing information needs, which cause increased demand for ubiquitous and very high speed wireless communications. In search for the urgent need of improved coverage and capacity, cellular networks are currently undergoing a major transformation from an architecture comprised of thoroughly planned macrocell base stations (MBSs) to a much more heterogeneous architecture where the macrocell network is underlaid by one or several tiers of unevenly deployed small cells. However, this new set of technologies is not exempt of several challenges. Backhaul is still an unresolved issue, i.e. which is the best technology for the small cell to reach the core network. In the case of uncoordinated co-channel deployments where the macrocell and small cell tier share the spectrum (e.g. femtocells or metrocells), the interference is also a major problem. In this paper, a new concept and architecture called femtorelays is introduced as a novel solution for next generation small cell problems. A femtorelay is a small cell access point that enables improved cellular coverage within indoor environments while increasing the overall system capacity through spatial frequency reuse. Working as an open-access small cell, it provides dual-backhaul connectivity to the core network for registered and unregistered users. One of the backhaul connections is the internet-based, and the second one is the relay-based operating on the spectrum owned by the wireless carrier. The radio interference between the macrocell and the small cell is overcome by servicing the macrocell interfering users at the femtorelay. Unlike the traffic from subscribers, this traffic will be forwarded to the network through the relay-based backhaul. The internal architecture, the approach employed to make the technology fit in existing networks, and future evolution of the basic femtorelays for larger scenarios are also presented. Finally, performance results show the potential of this technology to outperform other existing solutions.     

Group handoff management in low power microcell-femtocell network

This paper presents an analytical model of group based hand-off management based on bird flocking behavior. In the proposed scheme, a number of mobile devices form a group if these devices move together for a long time duration. Although call delivery or call generation are performed individually, hand-off is performed in a group. Dynamic group formation, group division and group merging methods are proposed in this paper. From the simulation results it is demonstrated that approximately 75%, 65% and 90% reduction in power, cost and latency consumption can be obtained respectively using group hand-off management. Thus the proposed scheme is referred as green, economic and fast hand-off strategy. In this paper instead of a macrocell network, a microcell-femtocell network is considered as the transmission power of a microcell or a femtocell base station is much less than a macrocell base station. Simulation results present that the microcell-femtocell network achieves approximately 25–55% and 35–55% reduction in power transmission, and 50–65% and 15–45% reduction in path loss than only a macrocell network and macrocell-femtocell network respectively. Thus microcell-femtocell network is a power-efficient network.     

Femtocell:固定移动融合接入网解决方案研究

FemtoceU(家用微微蜂窝)是市场驱动下的产物,是近年来FMC方案的最新发展,由于它具有的一系列优点开始受到电信综合运营商的追捧.通过它可以利用有线宽带解决家庭及中小企业的室内无线覆盖问题,并可以提供更高的数据业务带宽.本文简单介绍了Femtocell设备、接口、网络结构及其对现有网络的影响,分析了Femtocell的诸多优点及其发展前景.     

Cluster-based resource allocation mechanism for Femtocell network

A based-cluster resource allocation mechanism was proposed for suppressing interference between Femtocell and Macrocell in Macro-Femto network.The mechanism included three parts,FBS was put in disjoint clusters by graph theory and convex optimization,then a sub-channel allocation algorithm was adopted to assign sub-channel to the FUE and MUE based on fairness of rate.In the end,power allocation was performed by using distributed algorithm.Simulation results show that the proposed mechanism effectively suppresses cross-tier and co-tier interference in the Macro-Femto network,improves the average rate,meanwhile satisfies the requirements of fairness of rate,which makes users more satisfied.     

Femtocell小区选择问题研究

Femtocell是一种用于下一代移动通信技术的小型化家庭基站,由于其分布的随机性和接入方式的多样性,在Femtocell高密度覆盖的地区可能存在小区选择问题。文中介绍了Femto-cell存在的小区选择问题及相应的解决方案。     

Femtocell网络及其挑战分析

文章首先介绍了Femtocell的特点、标准现状、产品情况、应用情况，还简要分析了Femtocell网管系统的相关情况，并对Femtocell网络管理存在的问题进行了分析，同时提出了解决方案，最后提供了Femtocell网络管理的发展思路。     

基于Femtocell网络的时域资源划分

为了满足数据流量增长的需求,在LTE蜂窝系统中引入家庭基站.家庭基站能够分担宏蜂窝的数据流量,与此同时,也给蜂窝系统带来了较大干扰,这些干扰大大影响了用户的通信质量.为解决此问题,提出一种基于家庭基站网络时域资源划分方案(F-MFTR),此方法把时域资源划分与软频率复用技术(SFR)结合起来,边缘用户通过最优化方法寻找最佳的功率段,未参加调度的用户在小区之间形成“隔离带”,在理论上保证了边缘用户与系统中其他用户之间不存在干扰.此外,所有的用户可以在全频段上搜索最佳的资源块,能够提升用户的通信质量.仿真表明,这种方法能大大提升系统的吞吐量.