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Effect of propagation environment on area throughput of dense WLAN deployments
KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.ORCID-id: 0000-0001-7642-3067
KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab). KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, KTH Center för Trådlösa System, Wireless@kth.ORCID-id: 0000-0003-4986-6123
2013 (Engelska)Ingår i: 9th IEEE Broadband wireless access workshop (BWA 2013), IEEE Computer Society, 2013, s. 333-338Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Indoor wireless LAN deployments have become ubiquitous. As WLAN deployments become increasingly dense, WLANs start to cause more and more contention and interference to each other, to the point that they cause significant throughput degradation to other WLANs. Since WLANs are one of the most commonplace solutions to provide indoor broadband data access, it is crucial to assess the throughput limits of WLANs in order to understand at what demand level novel broadband access mechanisms will be critically needed. The amount of contention and interference that coexisting WLANs create on each other is influenced by the indoor propagation environment such as existence of walls or clutter. Although the indoor propagation environment has a significant impact on the interaction between WLANs, and consequently on the area throughput, the relationship between the indoor propagation environment and achievable area throughput has not received much attention. In this paper, we investigate the area throughput of densely deployed WLANs in different indoor propagation environments by conducting detailed MAC layer simulations using OPNET. The results show that the propagation conditions have a profound impact on achievable area throughput; as much as several tens of times increase in highly cluttered environments compared to open areas.

Ort, förlag, år, upplaga, sidor
IEEE Computer Society, 2013. s. 333-338
Nyckelord [en]
Broadband networks, Broad-band data, Broadband access, Cluttered environments, Dense WLAN, Indoor propagation, MAC layer, Propagation environment, Throughput degradation
Nationell ämneskategori
Kommunikationssystem Telekommunikation
Identifikatorer
URN: urn:nbn:se:kth:diva-136227DOI: 10.1109/GLOCOMW.2013.6825009Scopus ID: 2-s2.0-84902950612ISBN: 978-147992851-4 (tryckt)OAI: oai:DiVA.org:kth-136227DiVA, id: diva2:676749
Konferens
2013 IEEE Globecom Workshops, GC Wkshps 2013; Atlanta, GA; United States; 9 December 2013 through 13 December 2013
Forskningsfinansiär
Wireless@kth
Anmärkning

QC 20140912

Tillgänglig från: 2013-12-06 Skapad: 2013-12-04 Senast uppdaterad: 2014-10-20Bibliografiskt granskad
Ingår i avhandling
1. Capacity analysis of densely deployed wireless LANs
Öppna denna publikation i ny flik eller fönster >>Capacity analysis of densely deployed wireless LANs
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Wireless LANs (WLANs) based on the IEEE 802.11 standard have become an integral part of today’s indoor wireless communication infrastructure. As WLAN deployments become more prevalent and densely deployed, the nodes in these WLANs start to create congestion and interference with each other. This congestion and interference fundamentally limits the performance of these coexisting WLANs. We analyze the capacity limits of such densely deployed WLANs.

We begin our analysis by investigating the suitability of the attributes of WLANs, namely their cooperative operation based on locally available information, for indoor high-capacity wireless access provisioning. We compare the cooperative class of wireless systems with another class of systems whose users behave selfishly. Following this qualitative assessment, we perform a detailed, qualitative analysis of the capacity of densely deployed WLANs in terms of a number of key environmental and operational parameters. The indoor propagation environment has a significant influence on the congestion and interference that these coexisting WLANs exert on each other. Therefore we investigate the impact of propagation environment on the aggregate throughput of densely deployed WLANs. As WLANs are deployed in close proximity of each other, the transmissions in one WLAN start to influence the outcome of transmissions in other WLANs. The manner in which the access points are deployed, and the manner in which stations associate themselves with the available access points around themselves is shown to be an influential factor in the performance of these coexisting WLANs. Therefore, we investigate the impact of random versus planned access point deployment on performance of densely deployed WLANs. Similarly, we investigate the impact of stations associating with the access point with the strongest signal or with another sufficiently strong access point in their vicinity. Furthermore, we investigate the throughput of densely deployed WLANs when operating with bounded delay. More specifically we examine the case when the input traffic arriving at the transmitters are expected to reach their destination within a certain time period, thus the transmit queues cannot grow without bounded and the system should operate at a stable point.

The indoor propagation environment, creates complex interference relationships between nodes in coexisting WLANs.These complex interference relationships are compounded by the node interactions dictated by the nonlinear algorithms in the IEEE 802.11 MAC protocol, thus the problem of estimating the performance of these coexisting WLANs by means of simple analytical models becomes difficult. In contrast, detailed packet level simulations provide accurate performance estimates, although such analyses are computationally expensive. Therefore we seek to provide a model to estimate the throughput of densely deployed WLANs based on empirical throughput results of detailed simulations of such densely deployed WLANs. In addition, in our effort to develop an empirical throughput model for densely deployed WLANs, we develop a measure which we call “cell congestion” to be able to order and compare different propagation environments, and an “effective density” concept which accounts for the influence of the propagation environment on the congestion and interference experienced by a WLAN deployment of a given density. We expect these concepts to be useful in improving the operation of WLANs to be able to meet the predicted increase in demand for capacity.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. x, 91
Serie
TRITA-ICT-COS, ISSN 1653-6347 ; 1410
Nationell ämneskategori
Kommunikationssystem
Identifikatorer
urn:nbn:se:kth:diva-154343 (URN)
Disputation
2014-10-24, Sal A, Electrum 1, KTH, Isafjordsgatan 26, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Wireless@kth
Anmärkning

QC 20141020

Tillgänglig från: 2014-10-20 Skapad: 2014-10-17 Senast uppdaterad: 2014-10-23Bibliografiskt granskad

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