UWB Channels and Profiles

Generally, both the sync and blink layer has two communication settings – channel and RF profile. RF profile represents a set of UWB radio parameters. The figure below is taken from the RTLS Manager and illustrates channel and RF profile settings for sync and blink layer.

Setting the RF profiles are indicated by the red color and channel settings in blue. You should always set different radio channel or RF profile for sync layer and blink layer. If both layers are set to the same RF profiles and channels, collisions might occur, which could degrade the performance of the RTLS system.

There might be different configurations composed based on following:

  • Anchor SYNC can be done on CH5 / CH2 and profiles RF1, RF4.
  • Tag BLINK is set to CH5 only and profiles RF5, RF4. 


There are two recommended configurations:

a) Anchor sync layer CH5, RF1 and tag blink layer CH5, RF4. - this is default settings for Tags and Anchors.

b) Anchor sync layer CH2, RF4 and tag blink layer CH5, RF4.

Originally there were more RF Profiles, but they are deprecated, please do not use them anymore.



Blink and Sync Layers Separation

To separate the blink and sync layers, you can use either the RF profile or the channel, or a combination of both. The situation is described in more detail below.

The figure below shows the situation when the same RF profile and channel for both blink and sync layer are used. Using this setting is not recommended because collisions can occur.


On the following figure, we can see the situation where blink and sync layer are properly separated by using different RF profile for each one. Keep in mind, that some RF profiles may interfere with each other, for more info see table RF Profiles Interference Matrix.

The last figure shows a situation when blink and sync layer are properly separated by using different channels for each one.

Choice of the RF Profile for Blinks

Choice of the RF profile for Tag blinks have impact on the battery lifetime and channel utilization. More detailed information can be found in the tables below.

Channel utilization - number of tags in one location cell without collisions for a given RF profile.

Tag RF Profile / Tag Refresh Rate

Blink TX Time [ms]

10 s (0.1 Hz)

1 s (1 Hz)

0.5 s (2 Hz)

100 ms (10 Hz)

RF4

0.432

4166 tags

416 tags

208 tags

41 tags

RF5

0.175

10285 tags

1028 tags

514 tags

102 tags


Battery lifetime for 600mAh capacity – estimated as 8 hours of continuous transmissions per day. Can be further prolonged with the movement detection feature.

Tag RF Profile / Tag Refresh Rate

10 s (0.1 Hz)

1 s (1 Hz)

0.5 s (2 Hz)

100 ms (10 Hz)

RF4

3.9 years

0.9 year

186 days

40 days

RF5

4.1 years

1 year

215 days

47 days


Comparison of RF profiles with focus on channel utilization and signal robustness and range.

Order

Channel Utilization

Signal Robustness

Best

 

 

 

 

Worst

RF5

RF4

RF4

RF5


To separate the blink layer and sync layer by using the RF profiles while sharing the same channel for blinks and syncs, you can use the following table RF profiles interference matrix.

RF ProfileRF0RF1RF2RF3RF4RF5
RF0(chyba)(chyba)(chyba)(tikot)(tikot)(tikot)
RF1(chyba)(chyba)(chyba)(tikot)(tikot)(tikot)
RF2(chyba)(chyba)(chyba)(tikot)(tikot)(tikot)
RF3(tikot)(tikot)(tikot)(chyba)(chyba)(chyba)
RF4(tikot)(tikot)(tikot)(chyba)(chyba)(chyba)
RF5(tikot)(tikot)(tikot)(chyba)(chyba)(chyba)
(tikot)Without interference
(chyba)Interference occur


Note: Other modes besides RF4, RF5 and RF1 could be used for lab evaluation only and should not be used for real deployments.