Song Q, Wang X, Qiu T and Ning Z, "An Interference Coordination-Based Distributed Resource Allocation
Scheme in Heterogeneous Cellular Networks," IEEE Access, 5, pp.2152-2162, January, 2017.
Furthermore, the problem of resource allocation in MMC-CRs can take the following three forms: (i) uplink resource allocation with multiple local power constraints (e.g., see , -); (ii) downlink resource allocation with global power constraints (e.g., see ); and (iii) distributed resource allocation as in an ad-hoc scenario (e.g., see -).
 Qiu Jing R Zhou Zheng, "Distributed Resource Allocation Based on Game Theory in Multi-cell OFDMA Systems," Int J Wireless Inf Networks, 2009.
 Hassan, M.M., Hossain, M., Sarkar, A., Huh, E.N., "Cooperative game-based distributed resource allocation
in horizontal dynamic cloud federation platform," Information Systems Frontiers, pp.
Therefore it is necessary to find a distributed resource allocation
The resource allocation of relay-enhanced multi-cell OFDM systems can be classified into two categories : centralized resource allocation and distributed resource allocation
. Centralized means that there exists a central controller gathers all the information and feedback required from all the BSs and performs global resource allocation.