Access methods to WiMAX femtocells: A downlink system-level case study

Abstract

Over the last two years, GSM and UMTS femtocell access points have been proposed as a solution to the poor indoor coverage problem experienced in certain areas. Research on these devices has shown that femtocells will not only increase indoor system coverage, but also system capacity. Femtocells will allow new services and business models to be offered to indoor users. Almost parallely, the WiMAX standard has emerged as a potential candidate technology for the future wireless networks. WiMAX femtocells are currently under development and will therefore play an important role in the world of indoor broadband wireless access. However, several aspects of this new technology, such as the access method and interference avoidance techniques play a crucial role in the amount of interference caused to co-channel deployed macrocells. This paper provides a framework for the study of WiMAX macro-femtocell hybrid scenarios. An in-depth description of the necessary radio coverage prediction and system-level simulation for this kind of scenarios is introduced. Simulations and numerical results for two different types of access methods (public and private) in the downlink are also presented.

Femtocell versus WiFi - A survey and comparison of architecture and performance

“…Public access method provides better QoS and throughput but at the same time increases the number of hand overs and hence adds to the signalling overhead. Private access method is shown to decrease system throughput by 15%, however, surveys suggest that end users prefer using Private Access Methods [11]. Access methods for Femtocells and WiFi networks differ in terms of security.…”

Hybrid access for femtocells based on contract theory

“…Open access could improve the overall capacity of network because considerable macrocell users (MUs) locating at poor-coverage area could get access to femtocells. 4 However, open access substantially increases the handovers between cells and thus the call drop probability rises. On the contrary, closed access guarantees service quality and confidentiality of FUs, whereas it causes strong cross-tier interference between macrocells and femtocells.…”

Design of a Computationally Efficient Dynamic System‐Level Simulator for Enterprise LTE Femtocell Scenarios

“…López-Pérez et al use a static network simulator in an hybrid scenario (macro-and femtocells) for WiMAX technology to evaluate the performance of different interference avoidance algorithms [14][15][16]. Their simulations all involve residential scenarios, with both private and open (i.e., public) femtocells.…”

“…A sensitivity analysis is performed to check the influence of tuning HO parameters, namely HO margin (HOM) and Time-to-Trigger (TTT). HOM refers to all hysteresis values defined in (15), (18) and (19), so all hysteresis values from different HO algorithms are identically modified, while TTT refers to all trigger values defined in (14) and (16). This HOM and TTT considered parameters are those ensuring the quality of the HO process, [1].…”