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In addition to the user download delay, we also concern about the caching cost in the cache-enabled HetNet.
In networks with high dynamicity, reoptimizing the network at every change might lead to high costs through network reconfiguration and to low long term user download rates.
Stressing the tradeoff between user download delay and caching cost, we characterize the joint network performance as the weighted sum of user download delay and the caching cost via applying the concept of utility function and formulate the joint user association and content placement problem as a network utility minimization problem.
Stressing the tradeoff between user download delay and caching cost, we introduce the concept of utility function which characterizes the joint network performance as the weighted sum of user download delay and the caching cost and formulate the joint user association and cache content placement problem as a network utility optimization problem.
Therefore, different from previous works, the joint user association and cache content placement problem for cache-enabled HetNets is studied in this paper by emphasizing the tradeoff between user download delay and caching cost.
Hence, the total user download delay when accessing the requested contents, denoted by D, can be expressed as D = sumlimits_{i = 1}^{M} {sumlimits_{j = 1}^{N} {sumlimits_{k = 1}^{K} {alpha_{jk}{x_{ij}}{D_{ijk}}}} } (9).
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