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The global function

Let's look at the at a scenario in which the cable route the wired connection between the InfiMUX and the BS1 and the power injector was of BS1 is damaged (see Figure 7), i.e. power is supplied to BS1 and the device is ready to establish radio connections, but data can not be transmitted to the control center.

The vehicle with the CPE starts installed starts moving along the trajectory, from point A to point B. Being in the BS1 coverage area CPE , the CPE establishes a radio link with it. Since the cable route is the wired connection is damaged, no data is transmitted between the moving object and the control center. Moving along the trajectory, the mobile object get gets in the area when where it is possible to connect to BS2, but the connection parameters with BS1 are satisfactory and the CPE does not perform roaming between the BSBSs. Without the configured MultiBS function, the CPE will keep the connection with the BS1 sector until it leaves its radio coverage area.

The "Global" proprietary feature avoids this situation. If the Global function is activated on CPEthe CPE, then CPE  it will establish only establish a radio link only with devices there the devices on which the Global function is also enabled. In addition, devices in the same MINT area can perform a proxy function for devices with the Global function enabled. Thus, if the Global function is enabled on the InfiMUX and on the CPE, then all the BSs will inform the CPE that they have a connection to with the InfiMUX with the Global function activated at the time the radio connection is established. If a cable route is a wired connection is damaged between BS1 and the InfiMUX, BS1 will not inform the CPE about the availability of the InfiMUX, i.e. the speaker the CPE will not establish a radio link with BS1.

Using the Global function allows to increase the fault tolerance of the backbone backhaul radio network, however, it will have an effect a positive effect only with an appropriate radio frequency planning - planning since the coverage areas of the sectors must be overlappedoverlap.

Device configuration via CLI:

• Enable the Global function on the CPE:

  Code Block
  language text theme Emacs title Global function on CPE
  mint rf5.0 roaming enable global

• Enable the Global function on InfiMUXon the InfiMUX:

  Code Block
  language text theme Emacs title Global function on InfiMUX
  mint prf0 roaming enable global

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min_max min_max

Link establishment process control

One of the mechanisms determining the mechanisms to determine the moment of disconnection from one sector and establishing connection and the establishment of a connection with another, is the assessment SNR of the SNR threshold values threshold. Two thresholds are used in a wireless device configuration:

• hiamp: minimum SNR value required to establish a radio link between two devices.
• loamp: minimum SNR value at which the radio link between devices will not be broken.

Thus, threshold the thresholds values' configuration on a on the BS or CPE on the CPE is the mechanisms mechanism for controlling the roaming process of CPE roaming.

The SNR level configuration for establishing a radio link on wireless devices is performed using the following commands:

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One of the factors affecting the link parameters with for a moving object is the relevance of the MINT frame redirection table. This configuration The below configuration can only be applied on the InfiLINK 2x2 and InfiMAN 2x2 families devices. Device The device configuration allows to set the update interval for the MINT redirection table entries by choosing one of the three "mode" parameter values:

• fixed: the redirection table is updated at intervals of 3 seconds. This mode is intended for the static link organizationstatic (fixed) links.
• nomadic: the redirection table is updated at intervals of 1,5 seconds. This mode is intended for the link organization with slowly links connecting slowly moving objects.
• mobile: the redirection table is updated at intervals of 1 second. This mode is intended for the link organization with mobile connecting mobile objects.

As shown above, a CPE with activated the MultiBS function compares activated, compares the current radio link performance with the maximum achieved. There is a possible scenario in which the radio link parameters deteriorate sharply due to the short-term influence of the interference and also recover recovers sharply afterwards. The CPE will break the connection with the BS in accordance with the MultiBS function algorithm, despite the fact that the radio link parameters deterioration had a short-term natureoccurrence. The “mode” parameter selection affects the radio parameters' analysis when the MultiBS function is enabled, by setting the evaluation time interval. Thus, a device in a fixed mode evaluates the radio parameters over an a three seconds interval and is it is more resistant to link rupture link disconnection under short-term interference, than a device in a mobile mode, that evaluates the parameters more often..

Mode parameter in the device The "mode" parameter can be configured by using the following commands:

• Set the fixed mode on the Master and Slave devices:

  Code Block
  language text theme Emacs title Fixed mode configuration
  mint rf5.0 -mode fixed

• Set the nomadic mode on the Master and Slave devices:

  Code Block
  language text theme Emacs title Nomadic mode configuration
  mint rf5.0 -mode nomadic

• Set the mobile mode on the Master and Slave devices:

  Code Block
  language text theme Emacs title Mobile mode configuration
  mint rf5.0 -mode mobile

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two_abonent two_abonent

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Seamless roaming

As shown above, MultiBS function speeds up the CPE roaming between the BSs, however, in any case, roaming is accompanied by a short break in connection. Link interruption avoidance can be reached by using two CPEs on a moving object, combined by InfiMUX. In this case, each CPE will independently establish a radio link with the BS, and InfiMUX will distribute data traffic between those links.

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