On the Optimality of Treating Inter-Cell Interference as Noise: Downlink Cellular Networks and Uplink-Downlink Duality
On the Optimality of Treating Inter-Cell Interference as Noise: Downlink Cellular Networks and Uplink-Downlink Duality
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将小区间干扰视为噪声的最优性：下行蜂窝网络与上下行对偶性
DOI：
10.1109/tit.2020.3001219
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发表时间：
2019
影响因子：
2.5
通讯作者：
G. Caire
中科院分区：
文献类型：
--
作者：
Hamdi Joudeh;Xinping Yi;B. Clerckx;G. Caire
我们考虑了在下行蜂窝网络中将蜂窝间干扰作为噪声处理（多蜂窝TIN）的信息论最优性。我们重点研究了由高斯干扰广播信道（IBC）建模的场景，包括$K$相互干扰的高斯广播信道（bc），每个信道由基站向任意数量的用户通信独立消息组成。我们在IBC及其双干扰多址信道（IMAC）之间建立了一种新的功率分配对重性，这意味着两个网络通过多单元TIN和功率控制（TINA区域）实现的相应广义自由度区域是相同的。作为这种对偶性的副产品，我们从先前建立的IMAC TINA区域的表征中获得了IBC TINA区域的明确表征；并确定了一个多细胞的凸tin区域，其中IBC TINA区域是一个多面体（因此是凸的），而不需要分时。然后，我们确定了一个较小的多细胞TIN制度，其中IBC TINA区域是最优的，多细胞TIN达到IBC的整个容量区域，直到一个恒定的间隙。这是通过为IBC导出一个新的基因辅助外界来实现的，该外界揭示了在细胞间干扰下每个组成BC（或细胞）的用户之间保持的新的BC型顺序，这反过来又不是先前已知的BC型顺序（即退化的，更少噪声的和更有能力的顺序）所暗示的。我们为IBC确定的多单元TIN体系与之前为IMAC确定的相应多单元TIN体系相吻合，从而在gof（和近似容量）意义上建立了多单元TIN的全面上行-下行二元性。
We consider the information-theoretic optimality of treating inter-cell interference as noise (multi-cell TIN) in downlink cellular networks. We focus on scenarios modeled by the Gaussian interfering broadcast channel (IBC), comprising $K$ mutually interfering Gaussian broadcast channels (BCs), each formed by a base station communicating independent messages to an arbitrary number of users. We establish a new power allocation duality between the IBC and its dual interfering multiple access channel (IMAC), which entails that the corresponding generalized degrees-of-freedom regions achieved through multi-cell TIN and power control (TINA regions) for both networks are identical. As by-products of this duality, we obtain an explicit characterization of the IBC TINA region from a previously established characterization of the IMAC TINA region; and identify a multi-cell convex-TIN regime in which the IBC TINA region is a polyhedron (hence convex) without the need for time-sharing. We then identify a smaller multi-cell TIN regime in which the IBC TINA region is optimal and multi-cell TIN achieves the entire capacity region of the IBC, up to a constant gap. This is accomplished by deriving a new genie-aided outer bound for the IBC, that reveals a novel BC-type order that holds amongst users in each constituent BC (or cell) under inter-cell interference, which in turn is not implied by previously known BC-type orders (i.e. degraded, less noisy and more capable orders). The multi-cell TIN regime that we identify for the IBC coincides with a corresponding multi-cell TIN regime previously identified for the IMAC, hence establishing a comprehensive uplink-downlink duality of multi-cell TIN in the GDoF (and approximate capacity) sense.
扩展的 GDoF 最优机制，将 $M imes 2$ X 通道中的干扰视为噪声
影响因子：
2.5
作者：
S. Gherekhloo;A. Chaaban;A. Sezgin
通讯作者：
A. Sezgin