On the benefits of edge caching for MIMO interference alignment

Matha Deghel 1, 2 Ejder Baştuğ 2 Mohamad Assaad 1 Mérouane Debbah 2, 3
1 L2S - Laboratoire des signaux et systèmes
2 LANEAS - Large Networks and Systems Group
CentraleSupélec
3 Mathematical and Algorithmic Sciences Lab [Paris]
Abstract : —In this contribution, we jointly investigate the benefits of caching and interference alignment (IA) in multiple-input multiple-output (MIMO) interference channel under limited backhaul capacity. In particular, total average transmission rate is derived as a function of various system parameters such as backhaul link capacity, cache size, number of active transmitter-receiver pairs as well as the quantization bits for channel state information (CSI). Given the fact that base stations are equipped both with caching and IA capabilities and have knowledge of content popularity profile, we then characterize an operational regime where the caching is beneficial. Subsequently, we find the optimal number of transmitter-receiver pairs that maximizes the total average transmission rate. When the popularity profile of requested contents falls into the operational regime, it turns out that caching substantially improves the throughput as it mitigates the backhaul usage and allows IA methods to take benefit of such limited backhaul.
Keywords : 5G cellular networks wireless networks Index Terms—edge caching interference alignment limited backhaul
Type de document :
Communication dans un congrès
16th IEEE International Workshop on Signal Processing Advances in Wireless Communications, (SPAWC 2015), Jun 2015, Stockholm, Sweden. Proceedings of the IEEE International Workshop on Signal Processing Advances in Wireless Communications, 2015, 〈10.1109/SPAWC.2015.7227119〉
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INSMI | L2S | SUP_LSS | CENTRALESUPELEC | LANEAS | SUP_TELECOMS | UNIV-PARIS-SACLAY

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Matha Deghel, Ejder Baştuğ, Mohamad Assaad, Mérouane Debbah. On the benefits of edge caching for MIMO interference alignment. 16th IEEE International Workshop on Signal Processing Advances in Wireless Communications, (SPAWC 2015), Jun 2015, Stockholm, Sweden. Proceedings of the IEEE International Workshop on Signal Processing Advances in Wireless Communications, 2015, 〈10.1109/SPAWC.2015.7227119〉. 〈hal-01235910〉

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