Joint channel allocation and user association for heterogeneous wireless cellular networks

Abstract

Abstract-We study the engineering of heterogeneous cellular networks composed of a macrocell and some picocells by investigating the interplay of different network processes and parameters such as channel allocation, user association and reuse pattern (to control inter-cell interference between picocells). We formulate a joint association, channel allocation, and intercell interference management problem that relies on very few assumptions. This problem turns out to be an Integer Non-Linear program that is NP-hard. However, its structure is such that we can solve it exactly for relatively large size systems. We use optimal solutions as benchmarks to understand how different simple association schemes perform. Our results show the critical impact of the association rules on system performance and shows the interplay of the different processes and parameters. We believe that these insights will help design online association schemes in the future.

Joint Resource Allocation and User Association for Heterogeneous Wireless Cellular Networks

“…The proposed problems are Integer non-convex programs that are NP-hard. Unlike the proposed problem in [10], we cannot obtain exact solutions to such problems.…”

“…In our preliminary work [10], we develop a unified framework to analyze, compare, and evaluate the performance of different user association rules in Hetnets using max-min scheduling for OD only. In this paper, we assume that the system uses proportional fairness scheduling.…”

Joint User Association and Energy Offloading in Downlink Heterogeneous Cellular Networks

“…us, the optimal subchannel power allocation on subchannel s of BS n for user k is obtained from (16), as follows: (6) return η t+1 , flag � 1; (7) else (8) set t � t + 1, flag � 0; (9) end if (10) Until: (11) flag � 1 or t � T 1 . …”

“…Update P according to (18); (5) Update υ and λ according to (19) and (20), respectively; (6) Set t � t + 1; (7) Until ||]…”

“…e layout of heterogeneous cellular networks (HCNs) is more reasonable and economical than that of macro-only networks. However, extreme densification of BSs would bring a new challenge: cochannel interference is introduced by spectrum sharing in a local-area, which has significantly negative impact on system capacity [6]. Considering its high spectrum efficiency and flexibility in allocating radio resource, orthogonal frequency division multiple access-(OFDMA-) based HCNs system is a good candidate to achieve better performance wireless communications [7].…”