OFDMA Downlink Resource Allocation in User-Deployed Femtocells

用户部署 Femtocell 中的 OFDMA 下行链路资源分配

• 批准号: EP/H020268/1
• 负责人: Xiaoli Chu
• 金额: $ 12.88万
• 依托单位: King's College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH020268%2F1
• 关键词: OFDMA; Downlink; Resource; Allocation; User

One option for mobile operators to improve coverage and provide high-data-rate services in a cost-effective way is the emerging femtocell network, where low-power femtocell access points (FAPs), each being able to provide high-data-rate wireless connections to users within a short range, are overlaid on macro/micro cellular networks. Indoor deployments of femtocells can solve the problem of weak macrocell signal inside a building and offload a large amount of traffic from macrocells, leading to a promising solution for ubiquitous indoor/outdoor coverage with a single radio-access technology, such as the orthogonal frequency division multiple access (OFDMA) that has been considered in the downlink by major candidate technologies for next generation wireless networks. OFDMA combined with femtocells is widely expected to deliver massive improvements of coverage and capacity for wireless networks. Inter-cell interference management is among the most urgent challenges that operators must face before femtocells can be widely deployed. As plug-and-play devices, most FAPs will be deployed by end users and could be moved or switched on/off at any time. The number and locations of active FAPs are by no means known to operators. Therefore, inter-cell interference in femtocells cannot be managed using conventional network planning methods. An FAP has to be able to integrate itself into the cellular network with least interference caused. Most existing work on interference avoidance in femtocell deployments is for wideband code division multiple access (WCDMA) networks, while little work has been done for OFDMA-based femtocells, where interference avoidance can be implemented from a perspective of temporal and spectral reuse of OFDMA radio resources across different cells. This project aims to develop solutions for inter-cell interference avoidance through OFDMA downlink resource allocation in a network that has femtocells overlaid on macrocells. We will focus our work on the following two tasks: a) the development of a low-complexity interference-avoidance solution based on partial temporal and spectral reuse of OFDMA radio resources between femtocells, and b) the development of a dynamic time-frequency resource allocation algorithm for the OFDMA downlink to provide inter-cell interference avoidance and achieve a frequency reuse factor of 1 across macro and femto cells of the network. These cutting-edge topics cover some of the key aspects of future wireless networks and may lay the foundation to attain ubiquitous indoor/outdoor coverage.

移动运营商以经济高效的方式改善覆盖范围并提供高数据速率服务的一种选择是新兴的毫微微蜂窝网络，其中低功耗毫微微蜂窝接入点 (FAP)，每个接入点都能够提供高数据速率无线短距离内的用户连接覆盖在宏/微蜂窝网络上。室内部署毫微微蜂窝基站可以解决建筑物内宏蜂窝信号较弱的问题，并分流宏蜂窝的大量流量，从而为利用单一无线接入技术（例如正交频分）实现无处不在的室内/室外覆盖提供了有前景的解决方案下一代无线网络的主要候选技术已在下行链路中考虑了多址接入 (OFDMA)。人们普遍预计 OFDMA 与毫微微蜂窝基站相结合将大幅改善无线网络的覆盖范围和容量。小区间干扰管理是毫微微蜂窝基站广泛部署之前运营商必须面临的最紧迫挑战之一。作为即插即用设备，大多数 FAP 将由最终用户部署，并且可以随时移动或打开/关闭。运营商根本不知道活动 FAP 的数量和位置。因此，无法使用传统的网络规划方法来管理毫微微小区中的小区间干扰。 FAP 必须能够以最少的干扰将自身集成到蜂窝网络中。大多数关于毫微微蜂窝部署中干扰避免的现有工作都是针对宽带码分多址 (WCDMA) 网络，而针对基于 OFDMA 的毫微微蜂窝的工作却很少，其中可以从 OFDMA 无线电的时间和频谱复用的角度来实现干扰避免不同细胞之间的资源。该项目旨在开发在毫微微蜂窝覆盖在宏蜂窝上的网络中通过 OFDMA 下行链路资源分配来避免小区间干扰的解决方案。我们的工作重点是以下两项任务：a）开发基于毫微微小区之间 OFDMA 无线资源的部分时间和频谱复用的低复杂度干扰避免解决方案；b）开发动态时频资源OFDMA 下行链路的分配算法可避免小区间干扰，并在网络的宏小区和毫微微小区之间实现 1 的频率复用因子。这些前沿主题涵盖了未来无线网络的一些关键方面，并可能为实现无处不在的室内/室外覆盖奠定基础。

项目成果

Power Minimization Based Resource Allocation for Interference Mitigation in OFDMA Femtocell Networks

• DOI: 10.1109/jsac.2014.141213
• 发表时间: 2014-02-01
• 期刊: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
• 影响因子: 16.4
• 作者: Lopez-Perez, David;Chu, Xiaoli;Claussen, Holger
• 通讯作者: Claussen, Holger