The "Radio Settings" contains radio settings, which should be configured settings" section allows to configure radio parameters to establish wireless connection.
Radio settings are divided into the following categories:
Radio frontend
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title | Radio frontend settings description |
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| Parameter | Description |
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Unit role | One of the link units must be set to Master and the other one to Slave. At the link setup phase the following parameters must be set to the same value on Master unit and Slave unit: - Center frequency - it may be set by two ways:
- Manually via "Downlink center frequency" and "Uplink center frequency" parameters. In this case wireless link will be setup at once.
- Automatically with "Automatic selection of center frequency" function. In this case frequency channel grids must be set on both units. At the initial phase Master unit will select its center frequency automatically from grid, after that Slave unit will scan frequencies from its grid and wireless link will be setup when Slave find the center frequency which Master operates on.
- Channel width - should be set manually on both units.
When a wireless link is established Slave unit will continuously inherit radio frontend parameters from Master unit excluding frequency channel grids. So, if you change some values on Master they will be set on Slave automatically. | Automatic selection of center frequency | There are several approaches to define center frequencies in Quanta 5: - Frequency selection off - center frequency will be set manually.
- Instant DFS and radar detection - center frequency will be set automatically according to frequency channel grids. In this mode Master unit will switch to the different frequency if high level interference or radar will be detected. Slave unit will switch too at the same time.
- Instant DFS - center frequency will be set automatically according to frequency channel grids. In this mode Master unit will switch to the different frequency only if high level interference will be detected with no matter the type of interference source. Slave unit will be switched too at the same time.
| Independent UL/DL center frequencies | Units may transmit on diffrerent center frequencies. - Enabled - uplink and downlink frequencies can be set to different values.
- Disabled - uplink and downlink frequencies will be the same.
| Power limit | Power limit Dynamic frequency selection | Following modes are possible to operation: - Frequency selection off - the center frequency must be selected manually.
- Mandatory DFS and radar detction - the least noisy frequency will be selected in accordance with the set frequency grid. The device will block the frequency in case it detects a radar.
- Instant DFS - the least noisy frequency will be selected in accordance with the set frequency grid. The device will change frequency in case the strong interference appears.
- Instant DFS and radar detction - the least noisy frequency will be selected in accordance with the set frequency grid. The device will change frequency in case the strong interference appears and block the frequency in case it detects a radar.
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| The radar detection mode is only available with "ETSI" regulatory domain. Instant DFS and radar detection are only available for the Quanta 5 family devices. | For detailed description of the listed modes proceed to the Instant DFS article. | Regulatory domain | Regulatory domain automatically limits the wireless device operation which is may be needed to meet the local law requirements. Each regulatory domain may limits the following parameters: - Range of available center frequencies
- Requirement of use LBT (Listen Before Talk) technique.
- Maximum EIRP (Equivalent Isotropically Radiated Power) value.
- Requirement of use radar detection technique.
| Fixed center frequency | Available only on the Slave unit. - Enabled - center frequency must be set manually on wich the Slave unit will operate.
- Disabled - center frequenct will be selected automatically based on frequency channel grids.
| Downlink/Uplink center frequencies | Allows to manually set the center frequency. The Quanta 5 family devices allow independent frequencies configuration for uplink and downlink streams. When same frequencies are used on both streams, transmission will be carried out in time division duplex (TDD) mode, when different frequencies are assigned for uplink and downlink traffic, the transmission mode will change to hybrid frequency division duplex (H-FDD). The uplink frequency can be configured only on the master. Note |
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| Downlink - the direction from Master to Slave, Uplink - the direction from Slave to Master. These directions are correct for the whole link and do not depend on the roles of the devices. |
| Power limit | This parameter limits the transmitter power, there are two modes: - Transmitter output power - limits the power of transmitter to the set value.
- EIRP - limits the total system power calculated as:
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center- loss (an antenna gain and cable losses should be specified in the fields below).
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title | Figure - Radio frontend settings |
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Air frame
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title | Air frame settings description |
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| Parameter | Description |
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Channel width | Channel width, shoud be the same on both Master and Slave units. Available values: 3.5, 5, 7, 10, 14, 15, 20, 28, 30, 40, 50, 56 MHz. | Frame periodlength | Frame period affects the following wireless link metrics: - The greater frame period the more payload will be transmitted in one frame. Greater values increase latency.
- The lower frame period the less payload will be transmitted in one frame. Lower values decrease latency.
Please note that frame period value is strongly depends on interference conditions. If larger frames will be dropped then the larger payload is lost and system performance is decreased significantly. If smaller frames will be dropped then the smaller payload is lost and system performance is decreased not so significantly. | Guard interval | Guard interval is intended for intersymbol interference elimination. One of the causes of intersymbol interference is multipath propagation in which a wireless signal from a transmitter reaches the receiver via multiple paths. Guard interval affects payload size. So it should be increased only in case of intersymbol interference. | Uplink/Downlink ratio | Allows to configure quotes for uplink and downlink directions . Available values: 1, 2, 5, 10 ms. | Downlink /Uplink ratio | In automatic mode, the ratio changes dynamically in accordance with the transmitted traffic. Manual mode allows to set a fixed value. Available values depend from: - Channel width.
- Frame periodlength.
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title | Figure - Air frame settings |
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Automatic modulation and transmit power control
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title | AMC and ATPC settings description |
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| Parameter | Description |
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AMC strategy | There are folowing following AMC strategies are available: - Normal - represents a balance between the error rate and throughput values.
- Conservative - assumes using higher CINR thresholds in order to minimize the error rate.
- Agressive - lowers the thresholds in order to use higher modulation levels and thus increase the throughput but also increase the error rate.
- Extreme - lowers the CINR threshold below the Aggressive strategy values in order to maximize selected modulation and throughput.
| Automatic transmit power control | ATPC allows to automatically control transmitter output power . Each unit has its own automatically based on target RSSI level value calculated automatically. If actual RSSI level is lower then unit increases transmitter output power of the ewmote remote unit and vice versa. ATPC could not set value that may exceed the "Power limit" value. - The Master unit manages the transmit power of Slave unit.
- The Slave unit manages the transmit power of Master unit.
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centerTarget RSSI | RSSI value which will be used by ATPC as target. |
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title | Figure - AMC and ATPC settings |
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Frequency channel grids
Each available channel width connected with appropriate channel grid. Grid is used for automatic selection of center frequency function and contains a list of frequencies can be switched to. In the example below you may see that wireless unit with enabled "Automatic selection of center frequency" may change center frequency to the following values (MHz): 5100, 5120, 5140, 5300, 5390, 5410.
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5100-5140/20, 5300, 5390-5410/20 |
Each element of list may be set as follows:
- 5300 - exact value;
- 5100-5140/20, 5390-5410/20 - range of values with 20 MHz step, step always must correspond to channel width.
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scroll-titleThe frequency grid allows to limit the scan range in case the center frequency is automatically selected. Also Instant DFS will use these restrictions when monitoring the noise situation. Narrow grid of available frequencies speeds up scanning and link establishing process. Manual center frequency selection will also be limited to the values indicated in the grid.
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Please note grids shoud be the same on both Master and Slave units. |
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title | Figure - Frequency channel grids |
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