the in-building wireless standard...in the near future, lte and 802.11 may share 5 ghz spectrum if...
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THE IN-BUILDING WIRELESS STANDARDTHE IN-BUILDING WIRELESS STANDARDWIRELESS STANDARDWIRELESS STANDARD
Vladan Jevremovic, Research Director @v_jevremovic
WLPC Conference Budapest 2016
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Factors affecting capacity dimensioning
Granularity RF propagation User profilep Capacity zones
C ll l & WiFi Cellular & WiFi
Example
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Example
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QoS of applications running QoS types: voice, video, best effort, background Voice and video are less packet jitter and packet delay tolerant than file transfer # VoIP clients per AP # video clients per AP # BE clients per AP…
Venue type Manufacturing (Voice intensive) Stadium (Data intensive) Hospital (Voice, Data, RTL) Etc…
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Number of streams per UE Power consumption affects the number of streams Smart phones (one stream) Tablets (2 streams) Laptops (3 streams)
User density Low (manufacturing) Medium (office) Dense (Hospital)
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Ultra dense (Stadium)
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802.11 technology overhead 802.11 a/b/g have throughput ~ 50% listed maximum data rate 802.11 n & ac ~ 80% listed max data rate
AP density Closely spaced APs may increase CCI, especially at 2.4 GHz CCI th h t t d hi h i i ti CCI causes throughput to drop, which increases airtime usage
Available airtime
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50-80% depending on environment (stadium, campus, warehouse…)
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A floorplan often consists of multiple RF propagation environments They need to be identified and accounted for to accurately predict throughout They need to be identified and accounted for to accurately predict throughout
Inclined surface
Dense area
Open area
Semi Open area
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3D view of signal distribution is necessary for a multi - level building
2016-10-19The Capacity Challenge 7
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2D CCI prediction 3D CCI prediction
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Most clients run variety of application over a longer period of time
It is important to specify Period of activity, (1, 2, 3… hours) Applications likely to be used (Email, browsing, file transfer…) The quantity (Number of emails, web page visits, number of files…) File size (in MB) per unity
These specifications are often referred to as “user profile” Different verticals have different user profiles
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Different verticals have different user profiles Office environment VS. Stadium VS. Hospital…
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Most venues have non-uniform client distribution Example: a hotel has different client density in Example: a hotel has different client density in
Hotel rooms Conference rooms At ti d k/b kf t At reception desk/breakfast area
These areas may also have different usage pattern In a hotel room, a client mostly runs SD and HD videos At reception desk, web browsing In conference rooms, emails and file transfer
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A lot of venues have a mix of small cells/DAS and AP Some cellular carriers offload their traffic to partner WiFi providers Some cellular carriers offload their traffic to partner WiFi providers The offloading mechanism may vary
Offload by application type (voice vs. video. vs. data) Offload by signal KPI threshold Offload by cell load threshold
Some customers are on cellular network, some on WiFi Percentage breakdown of cellular and WiFi customers need to be specified This is done in each capacity zone
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This is done in each capacity zone
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In the near future, LTE and 802.11 may share 5 GHz spectrum
If approved, spectrum sharing may affect the existing 5 GHz networks
LTE/802.11 coexistence mechanism may affect Throughput Capacity Capacity
Dimensioning for both @ 5 GHz may become necessity in the near f
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future
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CABLEROUTING
FULL DATABASEOF PARTS
3D DESIGN &INCLINE
PROVENRESULTS IN
ACTIVE &PASSIVEROUTING
CAPTUREDOF PARTS(22,000+)
INCLINE SURFACES
RESULTS INHIGH‐DENSITY
VENUES
PASSIVE SURVEY
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Three level Holiday Inn hotel with open pool
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