On the Traffic Offloading in Wi-Fi Supported Heterogeneous Wireless Networks

Heterogeneous small cell networks (HetSNet) comprise several low power, low cost (SBSa), (D2D) enabled links wireless-fidelity (Wi-Fi) access points (APs) to support the existing macrocell infrastructure, decrease over the air signaling and energy consumption, and increase network capacity, data rate and coverage. This paper presents an active user dependent path loss (PL) based traffic offloading (TO) strategy for HetSNets and a comparative study on two techniques to offload the traffic from macrocell to (SBSs) for indoor environments: PL This work was supported by NSF Award No. 1318338. Ali Rıza Ekti [email protected] Muhammad Zeeshan Shakir [email protected] Erchin Serpedin [email protected] Khalid A. Qaraqe [email protected] Muhammad A. Imran [email protected] 1 Department of Electrical and Computer Engineering, Gannon University, Erie, PA 16541, USA 2 University of Western Ontario, London, ON, Canada 3 Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843–3128, USA 4 Department of Electrical and Computer Engineering, Texas A&M University at Qatar, Education City, 23874, Doha, Qatar 5 Center for Communication Systems Research (CCSR), University of Surrey, Guildford, UK and signal-to-interference ratio (SIR) based strategies. To quantify the improvements, the PL based strategy against the SIR based strategy is compared while considering various macrocell and (SBS) coverage areas and traffic– types. On the other hand, offloading in a dense urban setting may result in overcrowding the (SBSs). Therefore, hybrid traffic–type driven offloading technologies such as (WiFi) and (D2D) were proposed to en route the delay tolerant applications through (WiFi) (APs) and (D2D) links. It is necessary to illustrate the impact of daily user traffic profile, (SBSs) access schemes and traffic– type while deciding how much of the traffic should be offloaded to (SBSs). In this context, (AUPF) is introduced to account for the population of active small cells which depends on the variable traffic load due to the