Wireless site survey

A wireless website survey, sometimes alleged an RF website assay or wireless survey, is the action of planning and designing a wireless network, to accommodate a wireless band-aid that will bear the appropriate wireless coverage, abstracts rates, arrangement capacity, adrift adequacy and Quality of Account (QoS).1 The assay usually involves a website appointment to assay for RF interference, and to analyze optimum accession locations for admission points. This requires assay of architecture attic plans, assay of the facility, and use of website assay tools. Interviews with IT administration and the end users of the wireless arrangement are aswell important to actuate the architecture ambit for the wireless network.

As allotment of the wireless website survey, the able ambit abuttals is set, which defines the breadth over which arresting levels bare abutment the advised application. This involves free the minimum arresting to babble arrangement (SNR) bare to abutment achievement requirements.

Independent studies accept apparent that a lot of of the Wi-Fi wireless networks installed today are not optimally advised or installed,citation needed and abounding do not accommodate the account that they were advised to. Because of this, acrimonious wireless website surveys, planning and architecture contest are acceptable essential, abnormally to abutment the new brand of wireless casework such as Mobile VoIP and real-time location-based service.

Wireless website assay can aswell beggarly the walk-testing, auditing, assay or analysis of an absolute wireless network, decidedly one which is not accouterment the akin of account required.1

Wireless site survey process

Wireless website surveys are about conducted appliance computer software that collects and analyses WLAN metrics and/or RF spectrum characteristics. Before a survey, a attic plan or website map is alien into a website assay appliance and calibrated to set scale. During a survey, a architect walks the ability with a carriageable computer that continuously annal the data. The architect either marks the accepted position on the attic plan manually, by beat on the attic plan, or uses a GPS receiver that automatically marks the accepted position if the assay is conducted outdoors. After a survey, abstracts assay is performed and assay after-effects are accurate in website assay letters generated by the application.

All these abstracts collection, analysis, and decision tasks are awful automatic in avant-garde software. In the past, however, these tasks appropriate chiral abstracts recording and processing .23

Types of wireless site surveys

There are three capital types of wireless website surveys: passive, active, and predictive.4

During a acquiescent survey, a website analysis appliance irenic listens to WLAN cartage to ascertain alive admission points, admeasurement arresting backbone and babble level. However, the wireless adapter getting acclimated for a analysis is not associated to any WLANs.

During an alive survey, the wireless adapter is associated with one or several admission credibility to admeasurement round-trip time, throughput rates, packet loss, and retransmissions.

During a predictive survey, a archetypal of the RF ambiance is created appliance simulation tools. Virtual admission credibility are again placed on the attic plan to appraisal accepted advantage and acclimatize their amount and location.

Additionally, some analysis appliance acquiesce the user to aggregate RF spectrum abstracts appliance carriageable accouterments spectrum analyzers, which is benign in case of top RF arrest from non-802.11 sources, such as bake ovens or cordless phones.56

Software

Passive and alive surveys are performed application software and about crave alone a accordant off-the-shelf Wi-Fi adapter; no added specialized accouterments is required. Predictive surveys crave no accouterments at all, as no wireless abstracts accumulating is needed. Currently, professional-level website analysis applications abide primarily for Microsoft Windows. Some website analysis applications for added platforms, including iOS and Android, aswell exist, about they are bound in functionality due to the limitations of the basal belvedere API. For example, arresting akin abstracts cannot be acquired on iOS after jailbreaking.7 The achievability of creating professional-level applications for non-Windows tablets is debated.89

Hardware

Unlike acquiescent and alive surveys, RF spectrum surveys crave specialized RF equipment. There are assorted types of spectrum analyzers alignment from ample and big-ticket bench-top units to carriageable ("field units") and PC-based analyzers. Because portability is a absolute agency in administering wireless website surveys, PC-based spectrum analyzers in CardBus and USB anatomy factors are broadly acclimated today.4 WLAN chipset manufacturers are starting to absorb spectrum assay into their chipset designs;4 this functionality is chip into some high-end enterprise-class 802.11n admission points.1011