Optimization framework for baseband functionality splitting in C-RAN

An optimal baseband functionality splitting in cloud radio access networks (C-RAN) can reduce the operational and capital costs significantly. Therefore, in this paper we propose a dynamic functional splitting model in C-RAN. We formulate the problem of allocating the baseband processing load at C-RAN as a joint resource allocation and routing optimization problem. We adopt the alternating direction method of multipliers (ADMM) to solve the problem in a distributed way. The simulations shows that partially centralizing the processing load provides the optimal operating point in terms of minimizing a network-wide cost function.