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arXiv 1507.02199cs.NIcs.ITmath.IT
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具有CoMP的蜂窝网络中的联合传输--稳定性和调度算法

Joint Transmission in Cellular Networks with CoMP - Stability and Scheduling Algorithms

Guy Grebla, Berk Birand, Peter van de Ven, Gil Zussman

摘要:

由于目前的趋势是更小的小区,越来越多的蜂窝网络用户驻留在两个小区之间的边缘;这些用户通常由于相对较弱的信号和较强的干扰而接收到较差的服务。具有联合传输(JT)的协调多点(CoMP)是允许多个基站(BS)联合向单个用户进行传输的蜂窝联网技术。这提高了用户的接收质量,并促进了对小区边缘用户的更好服务。我们考虑一个CoMP使能的网络,包括多个BS通过回程网络互连。我们制定的OFDMA联合调度(OJS)的问题,确定子帧调度,并决定是否以及如何使用JT,以最大限度地提高一些效用函数。我们证明了OJS问题是NP难的。我们开发的最佳和近似算法的具体和一般的拓扑结构,分别。我们考虑了一个时间维,研究了一个分组到达的排队模型,其中每个子帧的服务速率通过解决OJS问题来获得。我们证明,当问题制定了一个特定的效用函数,并在每个子帧中最优解决,由此产生的调度策略是吞吐量最优的。通过广泛的模拟,我们表明使用JT的CoMP的大部分收益可以通过低容量回程实现。此外,我们的算法均匀地分配网络资源,增加小区间用户的吞吐量,只有轻微的成本,以小区内的用户。这是对跨层调度算法对CoMP网络的影响的严格的网络级理解的第一步。

英文摘要:

Due to the current trend towards smaller cells, an increasing number of users of cellular networks reside at the edge between two cells; these users typically receive poor service as a result of the relatively weak signal and strong interference. Coordinated Multi-Point (CoMP) with Joint Transmission (JT) is a cellular networking technique allowing multiple Base Stations (BSs) to jointly transmit to a single user. This improves the users' reception quality and facilitates better service to cell-edge users. We consider a CoMP-enabled network, comprised of multiple BSs interconnected via a backhaul network. We formulate the OFDMA Joint Scheduling (OJS) problem of determining a subframe schedule and deciding if and how to use JT in order to maximize some utility function. We show that the OJS problem is NP-hard. We develop optimal and approximation algorithms for specific and general topologies, respectively. We consider a time dimension and study a queueing model with packet arrivals in which the service rates for each subframe are obtained by solving the OJS problem. We prove that when the problem is formulated with a specific utility function and solved optimally in each subframe, the resulting scheduling policy is throughput-optimal. Via extensive simulations we show that the bulk of the gains from CoMP with JT can be achieved with low capacity backhaul. Moreover, our algorithms distribute the network resources evenly, increasing the inter-cell users' throughput at only a slight cost to the intra-cell users. This is the first step towards a rigorous, network-level understanding of the impact of cross-layer scheduling algorithms on CoMP networks.

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