Subcarrier allocation algorithms for multicellular OFDMA networks without Channel State Information

A flexible mid-term frequency domain scheduler for resource allocation in HetNets based on the SINR requested by users

“…We also recognize, from a practical point of view, that instantaneous and perfect knowledge of the channel is an impractical idealization of reality, as also stated by Chang et al [19] and Stiakogiannakis [20]. Hence, the proposal estimates the channel state, by considering mean loss and fading.…”

“…In today's WMCS, featuring a high user density, a huge amount of information should be collected, and considerable computing power is required in order to process the information in the required time frame (typically in the millisecond order). Chang et al [19] and Stiakogiannakis et al [20] state that perfect, global knowledge of channel status in a multicell OFDMA system is not a valid pretension in practice.…”

“…There are three categories from this perspective: (a) strategies which allocate resources assuming perfect, instantaneous knowledge of channel state [27]; (b) strategies performing allocation by assuming partial, imperfect knowledge of channel state [28][29][30]; and (c) strategies allocating resources assuming no knowledge about channel state [20].…”

“…We recognize that having a perfect, global knowledge of channel status in a multicell OFDMA system is not feasible in practice [19,20].…”

Performance evaluation of OFDMA techniques in multicellular networks

“…The random-coordinated subcarrier allocation algorithm divides each cell into two concentric regions, each one using a different subcarrier allocation algorithm [6]. The internal region employs random subcarrier allocation, while the external region employs coordinated subcarrier allocation.…”