Delay-Aware Aware Uplink Fronthaul Allocation in Cloud Radio Access Networks
Abstract: In cloud radio access networks (C-RANs), (C RANs), the baseband units and radio units of base stations are separated, which requires high high-capacity capacity fronthaul links connecting both parts. In this paper, we consider the delay-aware delay fronthaul allocation problem for C-RANs. RANs. The stochastic optimization problem is formulated as an infinite horizon average cost Markov decision process. To deal with the curse of dimensionality, sionality, we derive a closed-form closed form approximate priority function and the associated error bound using perturbation analysis. Based on the closedclosed form approximate priority function, we propose a low-complexity low complexity delay delay-aware fronthaul allocation algorithm solving solv the per-stage stage optimization problem. The proposed solution is further shown to be asymptotically optimal for sufficiently small residual interference. Finally, the proposed fronthaul allocation algorithm is compared with various baselines through simulations, simulations, and it is shown that significant performance gain can be achieved.