Cell-Free大规模MIMO系统中基于传输时延的缓存策略研究

doi:10.11959/j.issn.1000-436x.2021234

Abstract

Abstract:

To meet the ultra-low latency and ultra-high reliability requirements of users in the future mobile Internet， the wireless caching technology was combined with Cell-Free massive MIMO systems.The caching model was designed based on AP cooperative caching and regional popularity evaluation.The transmission delay expression involving AP clustering， cooperative caching， and regional popularity was derived， and the content placement problem was expressed as total content transmission delay minimization.Through the demonstration of the NP-hard and submodular monotony of the optimization problem， the greedy algorithm-based optimization strategy was proposed.Simulation results show that the proposed strategy can effectively reduce the content transmission delay and improve the cache hit rate.

Key words: Cell-Free massive MIMO system, caching placement, cooperative caching, content transmission delay

CLC Number:

TN92

Rui WANG, Min SHEN, Yun HE, Xiangyan LIU. Research on caching strategy based on transmission delay in Cell-Free massive MIMO systems[J]. Journal on Communications, 2021, 42(12): 134-143.

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References 25

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参数	含义
带宽/MHz	20
噪声功率N₀ /dBm	-90
p_p，p_d/mW	100/N₀， 200/N₀
σ_sf ，δ	8， 0.5
τ _p，τ_c	10， 200
文件大小S _fm /MB	5
传输速率r^FH，r^BH/（Mbit·s^-1）	20， 5

Research on caching strategy based on transmission delay in Cell-Free massive MIMO systems

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