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arXiv 1503.08227cs.ITmath.IT
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协调的蜂窝和分布式大规模MIMO:负载均衡和调度

Harmonized Cellular and Distributed Massive MIMO: Load Balancing and Scheduling

Qiaoyang Ye, Ozgun Y. Bursalioglu, Haralabos C. Papadopoulos

摘要:

具有能够在“大规模MIMO”机制中操作的大阵列基站(BS)的多层网络被设想为在满足爆炸式的无线业务需求方面发挥关键作用。大规模MIMO在具有基于互易性的训练的小小区上操作,承诺每单位面积具有低开销的高频谱效率。此外,在使用简单的准入控制机制和基本的BS调度器的蜂窝大规模MIMO HetNet中,接近最优的用户-BS关联和资源分配是可能的,因为可以利用大规模MIMO先验地预测调度的用户速率。由于每个上行链路导频固有地训练所有附近BS处的天线阵列,因此基于互易性的训练自然能够实现协作多点传输(CoMP)。在本文中,我们考虑了分布式MIMO形式的CoMP,它提高了小区边缘的性能,而不需要合作BS之间的信道状态信息交换。我们提出了用于在下行链路中协调操作分布式和蜂窝大规模MIMO的方法,其在整个网络上以较粗的时间尺度优化资源分配。我们还提出了在资源块级的目标接近最优分配的调度策略。仿真表明,所提出的方法可以显著优于网络优化的仅蜂窝大规模MIMO操作(即,没有CoMP的操作),尤其是在小区边缘。

英文摘要:

Multi-tier networks with large-array base stations (BSs) that are able to operate in the "massive MIMO" regime are envisioned to play a key role in meeting the exploding wireless traffic demands. Operated over small cells with reciprocity-based training, massive MIMO promises large spectral efficiencies per unit area with low overheads. Also, near-optimal user-BS association and resource allocation are possible in cellular massive MIMO HetNets using simple admission control mechanisms and rudimentary BS schedulers, since scheduled user rates can be predicted a priori with massive MIMO. Reciprocity-based training naturally enables coordinated multi-point transmission (CoMP), as each uplink pilot inherently trains antenna arrays at all nearby BSs. In this paper we consider a distributed-MIMO form of CoMP, which improves cell-edge performance without requiring channel state information exchanges among cooperating BSs. We present methods for harmonized operation of distributed and cellular massive MIMO in the downlink that optimize resource allocation at a coarser time scale across the network. We also present scheduling policies at the resource block level which target approaching the optimal allocations. Simulations reveal that the proposed methods can significantly outperform the network-optimized cellular-only massive MIMO operation (i.e., operation without CoMP), especially at the cell edge.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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