PMP450 Capacity Planner Guide R13.4

7/24/2019 PMP450 Capacity Planner Guide R13.4

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PMP 450 Capacity Planner Guide

Release 13.4


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PMP 450 Series introductionThe purpose of this document is to provide a quick description on how to use the PMP 450 Capacity

Planner.

The Cambium Networks PMP 450/PTP450 Series is a wireless access system designed to create a radiolocal area network (RLAN) through microwave links in a point-to-multipoint mode or point-to-point

mode operating in the 2.4 GHz, 3.5 GHz, 3.65 GHz, 5.4 GHz and 5.8 GHz bands. The PMP 450 Capacity

Planner can offer a quick help to determine the expected performances in terms of distances of a PMP

450 Series system operating in line-of-sight (LOS), near line-of-sight (nLOS) or non line-of-sight (NLOS)

propagation condition according to the configuration of several system parameters like transmitted

power and antenna selection.

The PMP 450/PTP 450 System creates a point-to-multipoint or point-to-point wireless broadband

connection transmitting a radio signal with OFDM modulation and MIMO transmission technique.

OFDM (Orthogonal Frequency Division multiplexing)is a multi-carrier radio signal modulation based on

the subdivision of the broadband channel into orthogonally-positioned subcarriers, each of which is

modulated based on a conventional modulation scheme. With the OFDM technique, a very high data

rate can be obtained increasing the systems spectrum efficiency.

The following are the subcarriers modulation schemes which can be used by the PMP 450 System:

QPSK

16-QAM

64-QAM

256-QAM

The OFDM channel bandwidth can be configured with one of three possible values: 5 MHz, 10 MHz and

20 MHz. 20 MHz channel bandwidth configurations allow for greater connection capacity as the signal

occupies a larger portion of the spectrum. Narrower channel bandwidths (10 MHz or 5 MHz) increase

reception sensitivity and allow for more opportunities to operate in spectrum-constrained RF

environments.

The channel bandwidth is configured in the AP. The SM scans all possible channel bandwidth and uses

the one matching the AP transmission.

MIMO (Multiple Input Multiple Output)radio transmission offers the capability of increasing the

capacity of a radio connection by transmitting and receiving parallel signals on separate Tx/Rx chains.

When the benefits of the MIMO techniques are combined with OFDM signaling and high system gain,

operators can achieve a highly robust radio connection in conditions of non-line-of-sight (NLOS)propagation. The PMP 450 System uses MIMO 2x2 with two radio receivers and two transmitters in

both the AP module and the SM module, transmitting in both directions two radio signals in the same

frequency. One signal is vertically polarized and the other signal is horizontally polarized.

Two modes of operation are supported: MIMO-A and MIMO-B.

With MIMO-A the system transmits the same information on both branches, and a combining gain is

achieved at the receiver. With MIMO-B the system transmits two distinct parallel data flows doubling its

transmission capacity.

PMP 450 Antenna options

Cambium Networks offers two sector antennas to be used with the AP module of the PMP 450 Systemto create the RF coverage of service areas in multisector sites. The antennas provided by Cambium


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Networks are specifically designed to optimize the performance in terms of radio coverage of the PMP

450 System:

60 sector antenna for sites with up to 6 AP modules

90 sector antenna for sites with up to 4 AP modules

Both antennas have dual polarization (Horizontal and Vertical or Slant, depending on the frequencyband) to implement the MIMO functionality of the PMP 450 System and are equipped with two N-type

female connectors to connect them to the AP module. Each antenna is supplied with a mechanical

bracket and can be mounted on a pole with diameter ranging from 50mm to 75mm.

The SM module antenna system gain may be increased by using a passive device:

CLIP: Cassegrain lens that adds 8-9dB to the antenna gain (depending on the frequency band)

Reflector: dish that adds 11-14 dB to the antenna gain (depending on the frequency band)

In both cases, the added gain is obtained by reducing the angle of the main lobe which increases

resilience to noise at the SM site.

Another option for the SM in the 5 GHz band is to use a PMP 450d, which is an SM radio integrated with

a reflector with a 25 dBi gain.

Types of connectionsThe PMP 450 Series can provide LOS (Line-Of-Sight), nLOS (near Line-Of-Sight) connectivity and NLOS

(Non-Line-Of-Sight) connectivity. A definition of these different propagation conditions are the

following.

LOS: the optical line between the AP and the SM and the first Fresnel zone are clear.

nLOS: the optical line between the AP and the SM is clear, but a portion of the first Fresnel zone is

blocked.

NLOS: the optical line between the AP and the SM and a portion or even much of the first Fresnel zone

are blocked, but subsequent Fresnel zones are open.


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Link budget calculationThe link budget is the list of all the gains and losses that contribute to the propagation of the radio

frequency signal that travels from the transmitter to the receiver.

The parameters that are taken into account for the calculation of the link budget are described below:

Transmitter output power: the median power level of the transmitter in the transmission channel

expressed in dBm (relative to milliwatt). This level can be configured for the AP transmitter within the

regulatory limits and is automatically adjusted in the SM transmitter through ATPC (Automatic Transmit

Power Control) functionality in order to get the maximum value.

Cable loss: the loss expressed in dB associated with the coaxial cable used to connect the transmitter

with the antenna. The loss typically depends on the length of the cable and its quality.

Transmitter antenna gain: assuming that the transmitter antenna main axis is oriented in the direction

of the receiver antenna, the maximum gain given in dB declared by the manufacturer is used.

EIRP(Effective Isotropic Radiated Power): is the sum of the transmitter output power and transmitter

antenna gain minus the cable loss, expressed in dBm.

Receiver antenna gain: assuming that the receiver antenna main axis is oriented in the direction of the

transmitter antenna, the maximum gain given in dB declared by the manufacturer is used.

Fade margin: the amount of power given in dB that represents the difference between the median

signal level at the receiver input and the receiver sensitivity. When the link fades exceeding the fade

margin an outage occurs. Fade margin must be selected by the user according to the link availability

target that must be met.

Receiver sensitivity: the minimum median signal level needed at the input of the receiver to achieve a

receiver output quality specific to a particular modulation scheme. Higher order modulation schemes

require higher quality receiver output and higher received power signal levels.

System Gain: the difference, expressed in dB, between the EIRP and the lowest order modulation

receiver sensitivity and cable loss. It conventionally refers to the minimum of the uplink and downlink

system gains and represents the maximum FSPL achievable with a particular system configuration.

FSPL (Free Space Path Loss): it represents the radio frequency propagation calculation used in the tool

and is the attenuation between the transmitter antenna and the receiver antenna in free-space given by

the Friis formula:

FSPL [dB] = 32.44 + 20logf+ 20logd

Wherefis expressed in MHz and dis expressed in kilometers

FSPL [dB] = 36.6 + 20logf+ 20logd

Wherefis expressed in MHz and dis expressed in miles

This link budget calculation can be considered a valid approximation for LOS propagation in flat fading

conditions where the operating bandwidth is less than the coherence bandwidth of the radio channel,

that is when the same degree of fading affects all frequencies of the signal bandwidth. In case the radiochannel is experiencing frequency-selective fading effect the LOS range results may not be valid.


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LINK BUDGET

The user interface of the LINK BUDGETtab is divided in three main parts: System Configuration,

Downlink and Uplink Budgets and Coverage and Throughput.

Frequency band 5.8 [GHz]

Region

Channel Bandwidth 20 [MHz] Lower Frequency 5735 [MHz]

Carrier frequency 5865 [MHz] Upper Frequency 5865 [MHz]

Mode

AP antenna system Frequency Spacing 2500 [kHz]

3rd party Antenna gain 20 [dBi] n Channel Carriers 53

3rd party Antenna cable loss 1 [dB] Non-overlapping Channels 7

Connectorized SMs in sector?

Connectorized SM antenna gain 23 [dBi] AP EIRP limit - [dBm]

Connectorized SM cable loss 1 [dB] Max AP Tx Output Power 22.0 [dBm]

AP Transmitter Output Power 22.0 [dBm] SM EIRP limit - [dBm]

Fade Margin 0 [dB] Max SM Tx Output Power 22.0 [dBm]

Downlink Data

Range unit

Max range 5 [mi] 40.0 [mi]

Contention slots

Adjacent Frequency Support

EnvironmentInterference measured?

SM antenna for measuring interf

Downlink interference level 0 [dBm]

Uplink interference level 0 [dBm] [email protected]

% of SMs with uneven paths (MIMO-A)

PTP Slave Tx Output Power 22 [dBm]

PTP MIMO mode

Frame length 2.5 [ms]

AP Tx Power per chain 19 [dBm] 0.079 [Watts] 19 [dBm] 0.079 [Watts]

AP Cable Loss 1 [dB] 0.001 [Watts] 9 [dBi]

AP Antenna Gain 17 [dBi] 0 [dBi]

Combined AP EIRP 38 [dBm] 6.310 [Watts] 31 [dBm] 1.3 [Watts]

-61 [dBm] 8X MIMO-B 256QAM -60 [dBm] 8X MIMO-B 256QAM

-61 [dBm] 4X MIMO-A 256QAM -60 [dBm] 4X MIMO-A 256QAM





-84 [dBm] 2X MIMO-B QPSK -82 [dBm] 2X MIMO-B QPSK

-84 [dBm] 1X MIMO-A QPSK -82 [dBm] 1X MIMO-A QPSK9 [dBi] 1 [dB] 0.001 [Watts]

0 [dBi] 17 [dBi]

Total DL Gain (8X MIMO-B) = 105 [dB] 104 [dB]

Total DL Gain (4X MIMO-A) = 105 [dB] 104 [dB]







The link is uplink limited by 2 dB

Modulation

8X MIMO-B 0.4 mi 0.4 mi 96.7/32.8/129.5 Mbps DL 23.4

4X MIMO-A 0.4 mi 0.4 mi 48.3/16.4/64.7 Mbps UL 7.1

6X MIMO-B 1.5 mi 1.1 mi 72.5/24.6/97.1 Mbps Total 30.5

3X MIMO-A 1.5 mi 1.1 mi 36.2/12.3/48.5 Mbps

4X MIMO-B 3.0 mi 2.3 mi 48.3/16.4/64.7 Mbps

2X MIMO-A 3.0 mi 2.3 mi 24.2/8.2/32.4 Mbps

2X MIMO-B 6.4 mi 5.0 mi 24.2/8.2/32.4 Mbps

1X MIMO-A 9.0 mi 7.0 mi 12.1/4.1/16.2 Mbps

PMP

MIMO-B

AP Rx Sensitivity

(Conservative assumption for

MIMO-A: large difference between

RSSI of two branches)

Total UL Gain (2X MIMO-A) =

Total UL Gain (2X MIMO-B) =


Cambium 90

10%




DL Range UL Range Max DL/UL/Total ThroughputCOVERAGE AND THROUGHPUT

Capacity (Mbps)

SM Rx Sensitivity

(Conservative assumption for MIMO-A:

large difference between RSSI of two

branches)



Cambium 90

Yes

SM Antenna Gain (including cable loss

for Connectorized)

Internal SM antenna AP Cable Loss

- AP Antenna Gain

PMP450 CAPACITY PLANNERCambium Networks confidential, not commercially binding

SYSTEM CONFIGURATION

Others

Combined SM EIRP

DOWNLINK BUDGET (AP to SM) UPLINK BUDGET (SM to AP)SM Tx Power per chain

SM Antenna Gain (including

cable loss for Connectorized)

Internal SM antenna

Cambium 90 -

LOS

75%

4

No

Yes

MIMO-B DL coverage and DL/UL/Aggregate throughput

SM antenna option for displaying data INTEGRATED

LINK BUDGET FOR INTEGRATED ANTENNA

miles

Max range limit

Integrated

1X not used

2X 24.2/8.2/32.4 Mbps

4X 48.3/16.4/64.7 Mbps

6X 72.5/24.6/97.1 Mbps

8X 96.7/32.8/129.5 Mbps


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In the SYSTEM CONFIGURATIONmenu the fields in green represent the parameters that can be set by

the user according to the system configuration that is applied to the PMP 450 system. The fields in white

are output values to be used as references for the input parameters setting.

The reference values are the following:

Lower frequency: lower edge of the selected frequency band

Upper frequency:upper edge of the selected frequency band

Frequency spacing:frequency interval for center carrier configuration

n of channel carriers: number of center carriers available in the selected band

n of non-overlapping channels: number of non-overlapping channels available for frequency reuse

AP EIRP limit: limit of the combined power emitted by the AP antenna system, as defined by the

regulatory region selected

Max AP Tx Power: upper limit of the combined power that can be applied to the AP antenna system, in

order to be compliant to the EIRP limit

SM EIRP limit: limit of the combined power emitted by the SM antenna system, as defined by the

regulatory region selected

Max SM Tx Power: upper limit of the combined power that can be applied to the SM antenna system, in

order to be compliant to the EIRP limit

Max range limit: Distance (in miles or km) between the AP and the farther SM that can be supported

with the selected configuration

The input parameters are the following:

Frequency band: selection of the frequency band (2.4 GHz, 3.5 GHz, 3.65 GHz, 5.4 GHz or 5.8 GHz)


Region

Channel Bandwidth 20 [MHz] Lower Frequency 5735 [MHz]

Carrier frequency 5865 [MHz] Upper Frequency 5865 [MHz]

Mode

AP antenna system Frequency Spacing 2500 [kHz]

3rd party Antenna gain 20 [dBi] n Channel Carriers 53

3rd party Antenna cable loss 1 [dB] Non-overlapping Channels 7


Connectorized SM antenna gain 23 [dBi] AP EIRP limit - [dBm]

Connectorized SM cable loss 1 [dB] Max AP Tx Output Power 22.0 [dBm]

AP Transmitter Output Power 22.0 [dBm] SM EIRP limit - [dBm]

Fade Margin 0 [dB] Max SM Tx Output Power 22.0 [dBm]

Downlink Data

Range unit

Max range 5 [mi] 40.0 [mi]

Contention slots


Environment

Interference measured?SM antenna for measuring interf


Uplink interference level 0 [dBm] [email protected]



PTP MIMO mode


PMP

MIMO-B

10%

Cambium 90

Yes


Others

LOS

75%

4

No

Yes

miles

Max range limit

Integrated


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Region:selection of the regulatory set of rules to be applied according to the country of operation.

Channel Bandwidth: selection of the width of the operating channel (5MHz, 10MHz or 20MHz).

In the 3.5 and 3.65 GHz bands, a channel bandwitdh of 7 MHz is also available.

Carrier Frequency:selection of the center carrier frequency of the operating channel within the

frequencies allowed by the regulatory applied.

Mode:selection of point-to-multipoint (PMP) or point-to-point (PTP) mode

AP antenna system: selection of the antenna used for the AP module.

If Mode is selected as PMP, the options for the AP antenna system are: Cambium Networks 60 sector

antenna, Cambium Networks 90 sector antenna or 3rdparty antenna commercially available.

If Mode is selected as PTP, the options for the AP antenna system are: Integrated, Integrated + Clip

(offered in the 5 GHz band only), Integrated + Reflector or 3rdparty antenna commercially available.


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3rdparty Antenna gain: definition of the gain of the 3rdparty antenna, valid only in case the AP antenna

systemparameter is set to 3rdparty antenna.

3rd

party Antenna cable loss: definition of the cable loss of the 3rd

party antenna, valid only in case theAP antenna systemparameter is set to 3rdparty antenna.

Connectorized SMs in sector?: Select Yes if any SM in the sector uses a connectorized antenna.

Otherwise select No.


Region

Channel Bandwidth 20 [MHz]

Carrier frequency 5865 [MHz]

Mode

AP antenna system

3rd party Antenna gain 20 [dBi]

3rd party Antenna cable loss 1 [dB]

Others

3rd party antenna

PMP


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Connectorized SM antenna gain: definition of the gain of the SM antenna, valid only in case there are

Connectorized SMs in the sector.

Connectorized SM cable loss: definition of the cable loss of the SM antenna, valid only in case there are

Connectorized SMs in the sector.

AP Transmitter Output Power:setting of the combined power transmitted by the AP module to its

antenna system. The value MUST be lower than the specified Max AP Tx Powerresulting from the EIRP

limit and AP antenna gain.

Note: If the AP EIRP limitor the SM EIRP limit areindicated as -, then the selected regulatory does not

impose any limit on the corresponding EIRP.

A configuration error message appears in case the value is set outside the allowed range or it is invalid

(for example, if it is not an integer number).


Region



Mode

AP antenna system

3rd party Antenna gain 20 [dBi]3rd party Antenna cable loss 1 [dB]


Connectorized SM antenna gain 23 [dBi]

Connectorized SM cable loss 1 [dB]

Yes

Others

3rd party antenna

PMP

AP EIRP limit 36 [dBm]

Max AP Tx Power 19.0 [dBm]


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In addition the EIRP of the AP module is shown in red if it is exceeding the limit defined by the

regulatory setting.

Fade Margin:setting of the margin on signal fading that the user wants to introduce in order to obtain

the desired link availability.The following table summarizes the estimated fade margin for a certain link availability.

Link availability Fade margin

in LOS

Fade Margin

in nLOS

Fade Margin

in NLOS (suburban)

Fade Margin

in NLOS (urban)

90% 0 dB 2.5 dB 4 dB 7.5 dB

99% 2 dB 4.5 dB 9 dB 17 dB

99.9% 5 dB 6.5 dB 16 dB 27 dB

99.99% 8 dB 9 dB 24 dB 37 dB

Downlink Data:Percentage of frame time dedicated to downlink (AP to SM) transmission. Valid inputs

are any value between 15% and 85% with a 1% granularity.

Range unit: Unit of distance (miles or kilometers) to be used in the calculations.

Max range:distance (in miles or km, depending on the selection in Range unit) between the AP and the

location of the farther SM the user wants to serve with the AP. With a smaller cell size, a larger

percentage of users can communicate with higher order modulation, and the sector capacity is higher.

On the other hand, with smaller cells network planning becomes very important, in order to limit

interference between sectors using the same frequency.

In PTP mode, this is the distance between the Master and the Slave.

If the value input in this field is larger than the maximum distance calculated using the other parameters

selected in the green cells (shown in the Max range limitfield), an error message appears.


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Also, the maximum value for this field is 40 miles (64 km).

Contention slots:Number of uplink symbols reserved for random access (network entry and bandwitdh

requests). A larger number of contention slots reduces the probability of collision when two or moreSMs attempt to send a request, but it also reduces the number of symbols dedicated to data

transmission, and therefore reduces the maximum throughput.

The number of contention slots has to be selected according to the specific deployment parameters in

each sector. If the number of contention slots is too small, then latency increases in high traffic periods.

If the number of contention slots is too high, then the maximum capacity is unnecessarily reduced.The

two main contributing factors to the selection of the number of contention slots are the number of VCs

in a sector, and the type of traffic in the sector.

- If the number of VCs in a sector is large, it is recommended to increase the number of

contention slots, in order to reduce the probability of two or more requests colliding. The

suggested contention slot settings as a function of the number of active VCs in the sector areshown in the following Table.

Number of VCs Suggested number of Contention slots

1 to 103

11 to 504

51 to 1506

>150

8


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Note that each SM uses one or two VCs. All SMs have a Low Priority Channel that uses one VC; if

the High Priority Channel is also enabled for the SM, then the SM uses a second VC. Therefore

the number of active VCs in a sector is greater than or equal to the number of SMs registered to

the AP in the sector. For example, a network including 20 SMs with High Priority Channel

disabled and 20 SMs with High Priority Channel enabled has 60 active VCs and may be

configured with 6 contention slots.

- Besides the number of VCs, the other main factor in contention slots selection is the type of

traffic. If the sector experiences a lot of uplink traffic composed of small packets, for example in

a sector that serves several VoIP streams, the average number of bandwidth requests

transmitted by each SM is high. Another scenario with constant uplink traffic is video

surveillance, which also generate a large number of uplink bandwidth requests.

In these cases the probability of two or more SMs transmitting a request in the same symbol is

high. When this happens, the latency of the system increases, and it is recommended to

increase the number of contention slots from the number in the previous Table. If an AP is

experiencing latency or SM-servicing issues, increasing the number of contention slots may

increase system performance, depending on traffic mix over time.

Recommendation on Contention Slots number selection

1- Calculate the number of active VCs in the sector (one VC per SM for SMs with Low Priority VC

enabled only; two VCs per SM for SMs with High Priority VC enabled)

2- Evaluate the traffic mix that is expected in the sector, more specifically the expected percentage

of real-time traffic (ex. VoIP, gaming, video conferencing, and video surveillance).

3- If the expected amount of real-time traffic is small, select the number of contention slots

according to the previous Table.

4- If the expected amount of real-time traffic is large, select a number of contention slots largerthan the number in the previous Table.

5- Monitor latency in your system. If the percentage of real-time traffic (or any uplink traffic)

increases and the sector experiences increasing latency and SM-servicing issues, increase the

number of contention slots from the current setting.

This is the reason why the maximum number of contention slots is 15, even if the previous Table

shows 8 contention slots for more than 150 VCs. If the number of VCs is more than 150 and a

significant portion of the traffic is real-time, the frequency with which bandwidth request

messages are transmitted requires a higher number of contention slots, potentially as high as

15. A sector with a high number of video surveillance cameras would also require a larger

number of contention slots to reduce the probability of collision between requests.

Adjacent Frequency Support: This feature is available only in the 3.5 and 3.65 GHz bands, because in all

other bands adjacent frequencies can be used in adjacent sectors without guard bands and without

limiting the transmit power.

Select Yes to limit the SM Tx power to 23 dBm (2 dB lower than the 25 dBm maximum the radio can

support) in the 3.5 GHz or 3.65 GHz bands. This feature allows operating with adjacent channels in

adjacent sectors. If No is selected, the SM Tx power is set at the maximum value of 25 dBm, but

adjacent channels need to have a guard band if used in adjacent sectors.


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Environment:type of propagation environment. The options for this field are: LOS, near LOS, NLOS

(suburban) or NLOS (urban).

The following table summarizes the excess path loss used in the range calculation formula for eachselection of the Environmentparameter.

Environment Excess Path Loss

LOS 0 dB

nLOS 5 dB

NLOS (suburban) 15 dB

NLOS (urban) 25 dB


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Interference measured?: Select Yes if the system experiences interference. Otherwise select No.

SM antenna for measuring interf: Antenna type used at the SM while performing interferencemeasurement. The list of options depends on the frequency band selected (for example, the CLIP is

available in the 5.4 GHz and 5.8 GHz bands only) and the presence of Connectorized SMs in the system.


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Downlink interference level: Value (in dBm) of the downlink interference measured in the channel

currently used (co-channel).

Uplink interference level: Value (in dBm) of the uplink interference measured in the channel currently

used (co-channel).


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% of SMs with uneven paths (MIMO-A): Percentage of SMs that are in a location experiencing a

different RSSI on the two Rx branches (for example, in NLOS conditions). For these SMs the rate adapt

algorithm will select a MIMO-A modulation mode if the throughput of the MIMO-A mode is higher thanthe MIMO-B throughput that can be sustained in the same channel condition.

This field is valid only if Modeis selected as PMP.


Region



Mode

AP antenna system






AP Transmitter Output Power 22 [dBm]

Fade Margin 0 [dB]

Downlink Data

Range unit

Max range 5 [mi]Contention slots


Environment

Interference measured?


Downlink interference level -94 [dBm]

Uplink interference level -94 [dBm]

Yes

Others

LOS

50%

4

Yes

miles

REFLECTOR

3rd party antenna

No

PMP


Region



Mode

AP antenna system



Connectorized SMs in sector?Connectorized SM antenna gain 23 [dBi]


AP Transmitter Output Power 22 [dBm]

Fade Margin 0 [dB]

Downlink Data

Range unit

Max range 5 [mi]

Contention slots


Environment



Downlink interference level -94 [dBm]

Uplink interference level -94 [dBm]


PMP

10%

Integrated

Cambium 90

No

Others

LOS

50%

4

Yes

Yes

miles


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PTP Slave Tx Output Power: Combined output power of the Slave. This field is valid only if Modeis

selected as PTP. Note that in PMP mode there is no corresponding input because the transmit power

of the SM is controlled by the AP through the power control algorithm.

PTP MIMO mode: Transmission mode used in the PTP link. Options are MIMO-A or MIMO-B.


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Frame length: Length of the TDD frame. Options are 2.5 ms and 5 ms.


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LINK BUDGET

In the LINK BUDGETpart of the user interface results are shown for the selected SM antenna

configuration.

The settings of all the parameters included in the link budget calculation are listed in two columns: one

for the downlink direction (from AP to SM) and one for the uplink direction (from SM to AP).

Note that the calculations are performed with sensitivity values with one decimal point precision, butboth the sensitivity values and the gain values are shown as integer numbers.

COVERAGE AND THROUGHPUT

In the COVERAGE AND THROUGHPUTsection the results of the link budget calculation are shown again

for the selected SM antenna configuration.

DL Range and UL range: represent for each modulation mode the maximum distance at which the radio

link can operate with the selected configuration and fade margin. Values of range in red indicate that

the potential range is larger than the maximum range set in the Max rangefield in the SYSTEM

CONFIGURATIONsection. Also, the range is limited to 40 miles, because that is the configuration limit

supported by the radio.

Max DL/UL/Total Throughput: the Downlink/Uplink/Total capacity of the sector assuming all the

registered SMs are operating at that modulation

AP Tx Power per chain 19 [dBm] 0.079 [Watts] 19 [dBm] 0.079 [Watts]

AP Cable Loss 1 [dB] 0.001 [Watts] 9 [dBi]

AP Antenna Gain 17 [dBi] 0 [dBi]

Combined AP EIRP 38 [dBm] 6.310 [Watts] 31 [dBm] 1.3 [Watts]







-84 [dBm] 2X MIMO-B QPSK -82 [dBm] 2X MIMO-B QPSK

-84 [dBm] 1X MIMO-A QPSK -82 [dBm] 1X MIMO-A QPSK

9 [dBi] 1 [dB] 0.001 [Watts]

0 [dBi] 17 [dBi]









The link is uplink limited by 2 dB

AP Rx Sensitivity

(Conservative assumpt ion forMIMO-A: large difference between

RSSI of two branches)




Cambium 90




SM Rx Sensitivity

(Conservative assumption for MIMO-A: large difference between RSSI of

two branches)



SM Antenna Gain (including cable loss

for Connectorized)

Internal SM antenna AP Cable Loss

- AP Antenna Gain

Combined SM EIRP

DOWNLINK BUDGET (AP to SM) UPLINK BUDGET (SM to AP)SM Tx Power per chain

SM Antenna Gain (including

cable loss for Connectorized)

Internal SM antenna

Cambium 90 -

SM antenna option for displaying data INTEGRATED

LINK BUDGET FOR INTEGRATED ANTENNA

Modulation

8X MIMO-B 0.4 mi 0.4 mi 63.9/65.5/129.4 Mbps DL 15.5

4X MIMO-A 0.4 mi 0.4 mi 32/32.8/64.8 Mbps UL 14.2

6X MIMO-B 1.5 mi 1.1 mi 47.9/49.1/97 Mbps Total 29.7

3X MIMO-A 1.5 mi 1.1 mi 24/24.6/48.6 Mbps

4X MIMO-B 3.0 mi 2.3 mi 32/32.8/64.8 Mbps

2X MIMO-A 3.0 mi 2.3 mi 16/16.4/32.4 Mbps

2X MIMO-B 6.4 mi 5.0 mi 16/16.4/32.4 Mbps

1X MIMO-A 9.0 mi 7.0 mi 8/8.2/16.2 Mbps

DL Range UL Range Max DL/UL/Total ThroughputCOVERAGE AND THROUGHPUT

Capacity (Mbps)


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DL/UL/Total Capacity:Downlink/Uplink/Totalcapacity of the sector, taking into account the percentage

of users using each modulation, under the assumption that the users are evenly distributed in the

covered area and that they all generate the same amount of traffic. The capacity of the sector is

calculated as a proportion of the peak capacity taking into account the AP antenna pattern and the fact

that the users are evenly distributed in the covered area.If the Modeis selected as PTP, this is simply the DL/UL/Total throughput at the modulation that the

link can support at the given distance.

The covered area is limited by the Max rangefield set in the SYSTEM CONFIGURATIONsection.

Appendix Ashows an example of capacity calculations.

Note that, in PMP mode, the DL/UL/Total Capacity values will be displayed in red as a warning if the

Max rangefield in the SYSTEM CONFIGURATIONsection is larger than the coverage that can be

achieved with the most robust modulation and coding rate (QPSK MIMO-A). In this case, the capacity

calculation is carried out within the covered area only. Numbers is red mean that the calculation does

not cover all the area indicated by the Max rangefield.

In PTP mode, if the Max rangefield in the SYSTEM CONFIGURATIONsection, which in this case indicates

the distance between the BHM and the BHS, is larger than the coverage that can be achieved with the

most robust modulation and coding rate (QPSK MIMO-A), the DL/UL/Total Capacity values show an Out

of range message.

The plot in the COVERAGE AND THROUGHPUTsection shows the range of communication that can be

achieved in the downlink with each MIMO-B modulation level, up to the maximum range set in the Max

rangefield in the SYSTEM CONFIGURATIONsection. MIMO-A modulation mode is also used because

this mode is used not only when the RSSI in the two branches is different, but also for extending the

range when the RSSI in the two branches is comparable but too low (and a 3 dB combining gain is

necessary to maintain the link).

If some modulation levels cover an area outside the Max rangefield, these modulation levels are notused. The legend in the plot indicates which modulation levels are not used, together with the peak

DL/UL/Total throughput for each used modulation level.

This plot is visible only if Modeis selected as PMP.

MIMO-B DL coverage and DL/UL/Aggregate throughput

1X not used

2X 16/16.4/32.4 Mbps

4X 32/32.8/64.8 Mbps

6X 47.9/49.1/97 Mbps

8X 63.9/65.5/129.4 Mbps


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NETWORK PLANNINGThe NETWORK PLANNINGtab calculates the total number of enterprise and/or residential customers

that can be supported in a sector, given a selected distribution of plans.

This tab is visible only if Modein the LINK BUDGET tab is selected as PMP.

In the NETWORK CONFIGURATIONsection the fields in white cannot be changed, and they are a

summary of the selections and the results in the LINK BUDGETtab. The fields in green in the NETWORK

CONFIGURATIONsection are populated by the user.

Downlink Data: percentage of frame time allocated to the downlink (AP to SM). This field corresponds

to the Downlink Datafield in the SYSTEM CONFIGURATIONsection of the LINK BUDGETtab.

Max range: distance between the AP and the location of the farther SM the user wants to serve with the

AP. This field corresponds to the Max rangefield in the SYSTEM CONFIGURATIONsection of the LINK

BUDGETtab.

Integrated %, Clip %, Connectorized %, Reflector Dish %, PMP 450d %: percentages of SMs using each

of the possible SM antenna systems. The last four percentages are input by the user, while the

Integrated SMs percentage is calculated based on the other inputs.These fields cannot exceed the corresponding Max %white fields that are calculated using the

parameters selected in the LINK BUDGETtab.

Ent. Oversubscription rate:oversubscription rate selected for the enterprise customers

Res. Oversubscription rate:oversubscription rate selected for the residential customers

SMs with HP VC %:Percentage of SMs that have the high priority (HP) VC enabled.

If an SM has the HP VC enabled, in addition to the low priority (LP) VC, it uses two VCs out of the

maximum 238 VCs available. This limit is taken into account in the Total Users/sector calculation.

% of SMs with uneven paths (MIMO-A): percentage of SMs using MIMO-A modulation modes. This fieldcorresponds to the % of SMs with uneven paths (MIMO-A) in the LINK BUDGETtab.

75% % of SMs with uneven paths (MIMO-A) 10%

Max range 5 Max %5% 100.0% 59.4 Mbps

Clip % 10% 100.0% 19.9 Mbps

25% 100.0% 79.3 Mbps25% 100.0%

PMP 450d % 35% 100.0%5

150%

AverageDistribution

DLUsers/sector

ULUsers/sector

TotalUsers/sector

3.0 Mbps 3.0 Mbps 25%5.0 Mbps 5.0 Mbps 50%

10.0 Mbps 10.0 Mbps 20%

20.0 Mbps 20.0 Mbps 5%

AverageDistribution

DLUsers/sector

ULUsers/sector

TotalUsers/sector

4.0 Mbps 1.0 Mbps 10%

15.0 Mbps 5.0 Mbps 20%20.0 Mbps 10.0 Mbps 50%

30.0 Mbps 15.0 Mbps 20%

DL

Users/sector

UL

Users/sector

Total

Users/sector

Enterprise 50%Residential 50%

156.25 Mbps 6.25

SMs with HP VC %

Downlink Data

Ent. Oversubscription rate

Avg UL capacity

Connectorized %Reflector Dish %

Avg DL capacity

PMP450 NETWORK PLANNER

Cambium Networks confidential, not commercially binding

NETWORK CONFIGURATION

Integrated %

46 21 21

Blended Monthly Service Plan C

Res. Oversubscription rate

Avg Tot capacity

Enterprise Monthly Service Plan A

Downlink UplinkAverage DL

Throughput/userAverage UL

Throughput/user

Residential Monthly Service Plan B

Downlink UplinkAverage DL

Throughput/userAverage UL

Throughput/user

Average DL

Throughput/user

Mbps 47 15

32 3245

Average UL

Throughput/user

12.83 Mbps

19.40 Mbps 9.10 Mbps

7.68 Mbps

SM antenna typ e distribution REFLECTOR

and/or PMP450d

Connectorized

CLIP

Integrated


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Avg DL/UL Capacity: downlink/uplink capacity of the sector, taking into account the percentage of users

using each modulation and each SM antenna system, and also the percentage of users using MIMO-A

and MIMO-B modulations.

The assumption is that SMs with antenna types with higher gain are deployed farthest from the AP,

while SMs with antenna types with lower gain are deployed closets to the AP. Considering fourconcentric rings centered at the AP (where each ring can have area equal to zero if the corresponding

percentage is zero), the innermost circle includes the locations of all SMs using an integrated antenna.

The outer three rings include the locations of all SMs using a CLIP antenna, a reflector dish and/or

PMP450d, or a connectorized SM, with order depending on the gain of the connectorized antenna. For

example, if the connectorized antenna gain is higher than the CLIP gain but lower than the reflector

dish, the order of the rings (starting from the AP) is: integrated, CLIP, connectorized, reflector dish

and/or PMP 450d. Note that the reflector dish and the PMP 450d are grouped in the same ring as their

antenna gain is the same.

The CLIP and PMP450d are only available in the 5 GHz band.

The distribution of the SM antenna types in the sector is shown by the plot.

Avg Tot Capacity: total (downlink + uplink) sector capacity of the sector, taking into account the

percentage of users using each modulation and each SM antenna system. This is the sum of the Avg DL

Capacityand the Avg UL Capacityfields.

Enterprise and Residential Plans

There are three types of plans. Plan A is an enterprise plan; plan B is a residential plan and plan C is a

blended plan, with a mix of enterprise and residential customers. Both the Enterprise and the

Residential plans comprise of a mix of plans with different Downlink/Uplink throughputs. The cells in

green are populated by the user, indicating the Downlink/Uplink throughputs for each plan and the

distribution (in percentage) for each plan.

For plans A and B:

Average DL Throughput/user: average downlink throughput needed by the enterprise or residential

customers with the mix of plans selected by the user. This is the weighted average of the four DL plans

using the Average Distributionvalues as weights.

Average UL Throughput/user: average uplink throughput needed by the enterprise or residential

customers with the mix of plans selected by the user. This is the weighted average of the four UL plans

using the Average Distributionvalues as weights.

DL Users/sector:number of users that can be supported in the sector satisfying the downlinkrequirements, taking into account the oversubscription rate. This is the Avg DL capacitydivided by the

average DL Throughput/userand multiplied by the corresponding oversubcription rate.

UL Users/sector:number of users that can be supported in the sector satisfying the uplink

requirements, taking into account the oversubscription rate. This is the Avg UL capacity divided by the

average UL Throughput/userand multiplied by the corresponding oversubcription rate.

Total Users/sector: lower number among the DL Users/sector, the UL Users/sector and the maximum

number of users per sector. The maximum number of users per sector is a number between 119 and

238 depending on how many SMs have the high priority VC enabled. If parameters are selected so that

the DL Users/sectorand the UL Users/sectorare close, then the total capacity of the sector is fullyutilized.


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23

Plan C is a mix of plans A and B with a certain percentage selected by the user.

In this case, the Average DL Throughput/useris the weighted average of the Average DL

Throughput/userfor the enterprise and residential customers, and the Average UL Throughput/useris

the weighted average of the Average UL Throughput/userfor the enterprise and residential customers.

The DL Users/sectorand the UL Users/sectorare again calculated as the Avg DL capacityand the AvgUL capacitydivided by the Average DL Throughput/userand the Average UL Throughput/user

respectively, multiplied by the corresponding oversubscription rate.

DL Users/sector=FLOOR(Avg DL Capacity/(Enterprise % Enterprise Average DL Throughput/user /

Enterprise oversubscription rate + Residential % Residential Average DL Throughput/user / Residential

oversubscription rate)

UL Users/sector=FLOOR(Avg UL Capacity/(Enterprise % Enterprise Average UL Throughput/user /

Enterprise oversubscription rate + Residential % Residential Average UL Throughput/user / Residential

oversubscription rate)

The Total Users/sectoris again the lowest number among the DL Users/sector, the UL Users/sectorand

the maximum number of users in a sector.

Appendix Bshows an example of calculation of number of Enterprise and Residential users.


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SECTOR THROUGHPUT CALCULATORThe SECTOR THROUGHPUT CALCULATORallows the user to either input the exact location of all the

users or to input the percentage of users that communicate at each modulation and coding level.

This tab is visible only if Modein the LINK BUDGET tab is selected as PMP.

In the SUBSCRIBERS LOCATIONSsection the user inputs the values in the green cells. The white cells

show calculated values.

SM distance: distance between the AP and the SM under consideration. Any number of SMs can beinput up to the current maximum number of VCs available in the PMP450 system (which is 238). The

distance can be input either in miles or kilometers, depending on the selection of the Range unit

parameter in the LINK BUDGETtab. A blank cell indicates the corresponding SM is not used.

SM antenna system:selection of the antenna system used for the SM under consideration. The options

are: integrated, Connectorized, CLIP, REFLECTOR and PMP 450d. Not all options are available in all

bands, and the Connectorized option is shown only if the Connectorized SMs in sector?field in the

SYSTEM CONFIGURATIONsection in the LINK BUDGETtab is selected as Yes.

Mode: Transmission mode of the SM under consideration. Options are MIMO-A or MIMO-B.

DL Modulation:modulation mode that can be supported by the SM in the downlink direction at the

distance input by the user and with the SM antenna system selected by the user

UL Modulation:modulation mode that can be supported by the SM in the uplink direction at the

distance input by the user and with the SM antenna system selected by the user

DL Throughput:downlink throughput supported by the SM at the modulation mode indicated in the DL

Modulationfield

UL Throughput:uplink throughput supported by the SM at the modulation mode indicated in the UL

Modulationfield

Total Throughput:sum of DL Throughputand UL Throughput.

SM number

SM antenna

system Mode

DL

Modulation

UL

Modulation

DL

Throughput

[Mbps]

UL

Throughput

[Mbps]

Total

Throughput

[Mbps]

DL/UL/Total

Throughput per

modulation [Mbps]

DL/UL/Total

Throughput per SM

[Mbps]

SM 1 1.3 [mi] Integrated MIMO-A 3X 2X 24.0 16.4 40.4 8X 0 0.0% 8X 0 0.0% 0/0/0 0/0/0

SM 2 3.2 [mi] Integrated MIMO-B 4X 2X 32.0 16.4 48.4 6X 28 56.0% 6X 13 26.0% 17.97/7.39/25.37 0.64/0.57/1.21

SM 3 1.1 [mi] Integrated MIMO-A 3X 3X 24.0 24.6 48.6 4X 19 38.0% 4X 33 66.0% 12.2/18.77/30.97 0.64/0.57/1.21



SM 6 1.8 [mi] Integrated MIMO-B 4X 4X 32.0 32.8 64.8 1X 0 0.0% 1X 0 0.0% 0/0/0 0/0/0

SM 7 1.6 [mi] Integrated MIMO-B 4X 4X 32.0 32.8 64.8

SM 8 1.6 [mi] Integrated MIMO-B 4X 4X 32.0 32.8 64.8 32.10

SM 9 2.1 [mi] Integrated MIMO-A 2X 2X 16.0 16.4 32.4 UL Average Capacity [Mbps] 28.44

SM 10 1.3 [mi] Integrated MIMO-B 6X 4X 47.9 32.8 80.7 Total Average Capacity [Mbps] 60.54







SM 17 1.3 [mi] Integrated MIMO-B 6X 4X 47.9 32.8 80.7 8X 10 0 5 0. 0% 8X 95 47.5% 15.25/13.51/28.75 0.19/0.15/0.34



SM 20 0.8 [mi] Integrated MIMO-B 6X 6X 47.9 49.1 97.0 2X 20 10.0% 2X 1 5 7 .5 % 2 .41 /2 .1 3/ 4.5 4 0 .1 9/ 0.1 5/ 0. 34

SM 21 1.6 [mi] Integrated MIMO-B 4X 4X 32.0 32.8 64.8 1X 0 0.0% 1X 10 5.0% 1.6/1.42/3.03 0/0.15/0.15

SM 22 1.3 [mi] Integrated MIMO-B 6X 4X 47.9 32.8 80.7 1X 0 0.0% 1X 10 5.0% 1.6/1.42/3.03 0/0.15/0.15

SM 23 1.3 [mi] Integrated MIMO-B 6X 4X 47.9 32.8 80.7 Total 200 Total 200


SM 25 1.3 [mi] Integrated MIMO-B 6X 4X 47.9 32.8 80.7 DL Average Capacity [Mbps] 38.82

SM 26 1.1 [mi] Integrated MIMO-B 6X 6X 47.9 49.1 97.0 UL Average Capacity [Mbps] 30.53

SM 27 1.3 [mi] Integrated MIMO-B 6X 6X 47.9 49.1 97.0 Total Average Capacity [Mbps] 69.35









DL/UL/Total

Throughput per

modulation [Mbps]

DL/UL/Total

Throughput per SM

[Mbps]SMs per UL modulation

SM distance SMs per DL modulation SMs per UL modulation

DL Average Capacity [Mbps]

INPUT SMs DIRECTLY

SMs per DL modulation

INPUT EACH SM'S LOCATION AND ANTENNA TY PE

PMP450 SECTOR THROUGHPUT CALCULATORCambium Networks confidential, not commercially binding

SUBSCRIBERS' LOCATIONS


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SMs per DL modulation:number and percentage of SMs that can communicate in the downlink

direction in each of the modulation modes, based on the distances input for each SM and the SM

antenna selection.

SMs per UL modulation:number and percentage of SMs that can communicate in the uplink direction ineach of the modulation modes, based on the distances input for each SM and the SM antenna selection.

DL Average capacity: downlink capacity of the sector, taking into account the percentage of users using

each downlink modulation, under the assumption that the users are distributed in the covered area as

indicated in the SUBSCRIBERS LOCATIONsection and that they all generate the same amount of traffic.

Calculations for determining this field are done in the same way described inAppendix A.

UL Average capacity: uplink capacity of the sector, taking into account the percentage of users using

each uplink modulation, under the assumption that the users are distributed in the covered area as

indicated in the SUBSCRIBERS LOCATIONsection and that they all generate the same amount of traffic.

Calculations for determining this field are done in the same way described inAppendix A.

Total Average capacity:sum of DL Average capacityand UL Average capacity.

DL/UL/Total Throughput per modulation: downlink/uplink/total throughput assigned to each

modulation. This is the product of the DL/UL/Total Average capacityand the % of SMs per DL/UL

modulation.

DL/UL/Total Throughput per SM: downlink/uplink/total throughput each SM in each modulation group

will experience, assuming all SMs are active at the same time. Note that for all modulation modes that

are in use in the sector these values are the same for all SMs. The reason is that it is assumed all SMs

generate the same amount of traffic, and therefore they are allocated the same throughput, regardless

of the modulation mode they can use for communication.

INPUT SMs DIRECTLY

If the user does not want to input the distances of the SMs one by one, and the statistics of the SMs

distances are available, the INPUT SMs DIRECTLYsection can be used.

In this section the user can directly input the number of SMs for each modulation mode (green cells) in

the downlink and in the uplink.

The DL/UL/Total Average Capacitycalculations, the DL/UL/Total Throughput per modulationand the

DL/UL/Total Throughput per SMcalculations are performed as explained above, but using the numbers

directly input by the user instead of using the SMs distances.

8X 100 50.0% 8X 95 47.5% 25.05/6.71/31.76 0.36/0.11/0.47

6X 50 25.0% 6X 55 27.5% 12.52/3.89/16.41 0.36/0.11/0.474X 30 15.0% 4X 25 12.5% 7.51/1.77/9.28 0.36/0.11/0.47

2X 20 10.0% 2X 15 7.5% 5.01/1.06/6.07 0/0.11/0.11

1X 0 0.0% 1X 10 5.0% 0/0.71/0.71 0/0.11/0.11

Total 200 Total 200

DL Average Capacity [Mbps] 72.50

UL Average Capacity [Mbps] 21.58

Total Average Capacity [Mbps] 94.08

DL/UL/Total

Throughput per

modulation [Mbps]

DL/UL/Total

Throughput per SM

[Mbps]SMs per UL modulation

INPUT SMs DIRECTLY

SMs per DL modulation


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ReferencesAll the detailed information about Cambium Networks PMP Series 450 can be found in the official

product documentation available for download from Cambium Networks public website:

http://www.cambiumnetworks.com/products/pmp/pmp-450

http://www.cambiumnetworks.com/support/pmp/software/index.php?tag=pmp450

Questions/Comments

[email protected]
http://www.cambiumnetworks.com/support/pmp/software/index.php?tag=pmp450mailto:[email protected]:[email protected]:[email protected]://www.cambiumnetworks.com/support/pmp/software/index.php?tag=pmp450


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Appendix A

Example of aggregate capacity calculationIn the aggregate capacity calculation two assumptions are made:

- The SMs are geographically evenly distributed in the covered area

- All SMs generate the same amount of traffic

In this example all SMs use an integrated antenna, and the input values selected in the SYSTEM

CONFIGURATION SECTION are the following:

These are the steps for calculating the aggregate capacity:

- First, the SMs that are not in a location that requires MIMO-A transmission are considered. The

modulation modes supported by these SMs are 256QAM MIMO-B (8X), 64QAM MIMO-B (6X),

16QAM MIMO-B (4X), QPSK MIMO-B (2X) and QPSK MIMO-A (1X). The QPSK MIMO-A mode is

also considered here because this mode is used not only in propagation conditions when the

received signals strength is very different between the two branches, but also to extend the

range. In this case the diversity gain increases the system gain and extends the range.

The Potential Range for each modulation is limited by the Max rangefield in the SYSTEM

CONFIGURATIONsectionExample with Max range set at 5 miles and integrated antenna.


Region



Mode

AP antenna system






AP Transmitter Output Power 22.0 [dBm]

Fade Margin 0 [dB]

Downlink Data

Range unit

Max range 5 [mi]

Contention slots


Environment




Uplink interference level 0 [dBm]



PTP MIMO mode


Yes

miles

Integrated

Others

LOS

50%

4

No

Cambium 90

Yes

10%

PMP

MIMO-B


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Modulationmode Potential range Actual range

8X 0.4 miles 0.4 miles



2X 6.4 miles 5 miles

1X 9.0miles 5 miles

- Calculate the area (in square miles) covered with each modulation

The modulation and coding level supported by each SM in LOS conditions depends on the

distance between the AP and the SM. SMs closer to the AP can support higher modulation

modes, while SMs farther from the AP can only support lower modulation modes.

This figure shows the area covered by the AP and the five rings corresponding to one of the

modulation modes supported by the PMP450 system.

Assuming a 90 sector antenna at the APand considering the percentage of SMs non in MIMO-Amodulation (90%), the areas covered by the AP at each modulation level are shown in the next

table.


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Modulation

mode

Area (square miles) Area (%)

8X0.15 0.68%

6X 1.72 7.88%

4X 5.39 24.73%

2X 12.37 56.71%

1X 0.00 0.00%

The area calculated for modulation mode 1X is equal to 0, because the sector under

consideration is limited at a range of 5 miles, so the assumption is that there are no users (and

therefore no area covered) beyond 5 miles.

The same table also shows the percentage of the total area (within the 5 mile range) covered

with each modulation. Since all SMs are assumed to be evenly distributed in the covered area,

these percentages also represent the percentages of SMs communicating at each of the

modulation modes.

- Calculate the DL time and the UL time allocated for each modulation mode

The time in the DL and UL subframes is divided among SMs (and therefore MCS levels)proportionally to the percentage of users communicating at each modulation mode. The

following table shows the DL and UL times which are calculated as

DL (UL) time for mode X = % area for mode X / DL (UL) throughput for mode X

MCS level DL time (s) UL time (s)

8X0.000106 0.000086

6X 0.001644 0.000821

4X 0.007729 0.004176

2X 0.035445 0.043478

1X 0.000000 0.000491

- Repeat the above calculations for the 10% of SMs using MIMO-A mode. These lead to the

following table:

MCS level DL time (s) UL time (s)

4X0.000024 0.000019


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3X 0.000365 0.000183

2X 0.001718 0.000932

1X 0.007877 0.009705

- Calculate the DL, UL and total capacity

The DL (UL) peak capacity is the inverse of the sum of the DL (UL) times allocated for each

modulation mode (MIMO-A and MIMO-B). The peak capacity is then multiplied by a factor

(equal to 85%) to take into account the AP antenna pattern and the fact that the users are

evenly distributed in the covered area.

DL (UL) capacity = 1/sum of all DL (UL) times per modulation mode * antenna factor

The total capacity is simply the sum of the DL and UL capacities.

DL Capacity = 15.5 Mbps

UL Capacity = 14.2 MbpsTotal Capacity = 29.7 Mbps


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Appendix B

Example of calculation of Number of Enterpr ise and Residential Users

Let us assume the following configuration parameters:

As shown in the figure, SMs closer to the AP utilize an integrated antenna, while SMs farther from the

AP utilize either augmentation or a connectorized antenna.

With these configuration parameters the resulting capacities are:


Region



Mode

AP antenna system






AP Transmitter Output Power 22.0 [dBm]

Fade Margin 0 [dB]

Downlink Data

Range unit

Max range 5 [mi]

Contention slots


Environment




Uplink interference level 0 [dBm]



PTP MIMO mode


Yes

miles

Integrated

Others

LOS

50%

4

No

Cambium 90

Yes

10%

PMP

MIMO-B


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The plans offered to enterprise customers are:

The plans offered to residential customers are:

Downlink Uplink

Average

Distribution

4.0 Mbps 1.0 Mbps 10%

15.0 Mbps 5.0 Mbps 20%

20.0 Mbps 10.0 Mbps 50%

30.0 Mbps 15.0 Mbps 20%

For plans A (Enterprise) and B (Residential):

Average DL Throughput/user

Enterprise Average DL Throughput/user = 3 Mbps 25% + 5 Mbps 50% + 10 Mbps 20% + 20 Mbps

5% = 6.25 Mbps

Residential Average DL Throughput/user = 4 Mbps 10% + 15 Mbps 20% + 20 Mbps 50% + 30 Mbps

20% = 19.40 Mbps

Average UL Throughput/userEnterprise Average UL Throughput/user = 3 Mbps 25% + 5 Mbps 50% + 10 Mbps 20% + 20 Mbps

5% = 6.25 Mbps

Residential Average UL Throughput/user = 1 Mbps 10% + 5 Mbps 20% + 10 Mbps 50% + 15 Mbps

20% = 9.10 Mbps

DL Users/sector:

Enterprise DL Users/sector = FLOOR(36.1Mbps/6.25 Mbps 5) = 28

Residential DL Users/sector = FLOOR(36.1 Mbps/19.40 Mbps 15) = 27

UL Users/sector

Enterprise UL Users/sector = FLOOR(32.8Mbps/6.25 Mbps 5) = 26Residential UL Users/sector = FLOOR(32.8 Mbps/9.10 Mbps 15) = 54

36.1 Mbps

32.8 Mbps

68.9 Mbps

Avg UL capacity

Avg DL capacity

Avg Tot capacity

Average

Distribution

3.0 Mbps 3.0 Mbps 25%

5.0 Mbps 5.0 Mbps 50%

10.0 Mbps 10.0 Mbps 20%

20.0 Mbps 20.0 Mbps 5%

Downlink Uplink


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Total Users/sector

Enterprise Total Users/sector = min(28,26) = 26

Residential Total Users/sector = min(27,54) = 27

Parameters are selected efficiently if the number of DL Users/sector is approximately equal to the

number of UL Users/sector, so that no downlink or uplink resources remain unutilized.

Plan C is a mix of plans A and B with a certain percentage selected by the user.

For this example the percentages of plans A and B are both 50%.

DL Users/sector= FLOOR(36.1 Mbps/(50% 6.25 Mbps / 5 + 50% 19.40 Mbps / 15) = 28

UL Users/sector= FLOOR(32.8 Mbps/(50% 6.25 Mbps / 5 + 50% 9.10 Mbps / 15) = 35

Total Users/sector= min(28,35) = 28

PMP450 Capacity Planner Guide R13.4

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Transcript of PMP450 Capacity Planner Guide R13.4