Effect of co-existence interferences on QoS of HSPA/WCDMA mobile networks

Klozar, Lukas; Polák, Ladislav; Kaller, Ondrej; Prokopec, Jan

doi:10.1109/radioelek.2013.6530937

Cited by 12 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DDMAC is trying to increase the network's accessibility by considering dependence between the path loss and communication range as mentioned in previous paragraph. This model performs better compared to the best multichannel method (BMC) [11], [12], [17] which selects the best channel as that one having highest rate of data transmission.…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

A New Protocol for Cooperative Spectrum Sharing in Mobile Cognitive Radio Networks

Abolhassani¹,

Sadough²,

Hosseini³

2015

RADIOENGINEERING

View full text Add to dashboard Cite

To optimize the usage of limited spectrum resources, cognitive radio (CR) can be used as a viable solution. The main contribution of this article is to propose a new protocol to increase throughput of mobile cooperative CR networks (CRNs). The key challenge in a CRN is how the nodes cooperate to access the channel in order to maximize the CRN's throughput. To minimize unnecessary blocking of CR transmission, we propose a so-called new frequency-range MAC protocol (NFRMAC). The proposed method is in fact a novel channel assignment mechanism that exploits the dependence between signal's attenuation model, signal's frequency, communication range, and interference level. Compared to the conventional methods, the proposed algorithm considers a more realistic model for the mobility pattern of CR nodes and also adaptively selects the maximal transmission range of each node over which reliable transmission is possible. Simulation results indicate that using NFRMAC leads to an increase of the total CRN's throughput by 6% and reduces the blocking rate by 10% compared to those of conventional methods.

show abstract

Section: Related Workmentioning

confidence: 99%

“…Moreover, we consider that CR users are mobile. Mobility may cause significant variation in the co-channel interference [10], [11] and make it a limiting factor. So, it is of great importance to propose an efficient and agile way for cooperative spectrum sharing among different cognitive users in such a scenario.…”

Section: Introductionmentioning

confidence: 99%

A New Protocol for Cooperative Spectrum Sharing in Mobile Cognitive Radio Networks

Abolhassani¹,

Sadough²,

Hosseini³

2015

RADIOENGINEERING

View full text Add to dashboard Cite

show abstract

“…Undesirable interactions between similar or different kinds of wireless communication systems, operating in adjacent or shared frequency bands, are not a new phenomenon [3,[15][16][17][18]. The exploration, monitoring, measurement, and possible suppression of interferences are a hot topic.…”

Section: Related Workmentioning

confidence: 99%

“…From the viewpoint of service providers, efficient usage of limited resources in the radio frequency (RF) spectrum is one of the biggest challenges. Hence, the increasing density of wireless networks and the increasing volume of user equipment (UE) terminals in use escalate the risk of unwanted coexistence scenarios [3,4].…”

Section: Introductionmentioning

confidence: 99%

Study of coexistence between indoor LTE femtocell and outdoor-to-indoor DVB-T2-Lite reception in a shared frequency band

Polák

Klozar

Kaller

et al. 2015

J Wireless Com Network

View full text Add to dashboard Cite

Nowadays, the demand for high-quality multimedia services (video, audio, image, and data) is rapidly increasing. The Digital Video Broadcasting -terrestrial (DVB-T) standard, its second-generation version (DVB-T2), and the Long-Term Evolution (LTE) standard are the most promising systems to fulfill the demand for advanced multimedia services (e.g., high-definition image and video quality), especially in Europe. However, LTE mobile services can operate in a part of the UHF band allocated to DVB-T/T2 TV services previously. The main purpose of this work is to explore the possible coexistences of DVB-T2-Lite and LTE systems in the same shared frequency band (co-channel coexistence) under outdoor-to-indoor and indoor reception conditions. Furthermore, an applicable method for evaluating coexistence scenarios between both systems is shown with a particular example. These coexistence scenarios can be noncritical and critical. In the first case, both systems can coexist without significant performance degradation. In the second one, a partial or full loss of DVB-T2-Lite and/or LTE signals can occur. We consider an indoor LTE femtocell and outdoor-to-indoor DVB-T2-Lite signal reception in a frequency band from 791 up to 821 MHz. Simulations of combined indoor and outdoor signal propagation are performed in MATLAB using 3rd Generation Partnership Project (3GPP) channel models, separately for both DVB-T2-Lite and LTE systems. Correctness of path loss simulation results is verified by measurements. Afterwards, an appropriate linear model is proposed which enables to evaluate the impact of coexistence on performance of both systems in outdoor-to-indoor and indoor-to-indoor reception scenarios. The results are related to an actual location in the building and are presented in floor plans. The floor plans include different coexistence conditions (different power imbalance and different amount of overlay of the radio channels). Service availability of both systems is verified again by measurements. The resulting maps help better understand the effect of coexistence on achievable system performance under different indoor/outdoor reception situations considering real transmission conditions.

show abstract

“… Uplink air interface overload caused from outer source of interference presented at [20]. Sources of outer interference could be malfunctioning radio devices (TV antenna amplifier, DECT systems, FAX devices etc.…”

Section: Air Interface Uplink Capacity Overload Examplesmentioning

confidence: 99%