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playground:wiki3:network_delays
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playground:wiki3:network_delays [2020/03/19 16:31] dlr |
playground:wiki3:network_delays [2020/03/19 17:09] dlr rollback for variable names |
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| <code> | <code> | ||
| - | T0_lns = now - N_du | + | T0lns = now - Ndu |
| - | T_est = now + T_agg + T_opp + N_dd | + | Test = now + Tagg + Topp + Ndd |
| - | Decision = T_est - T0_lns = N_du + T_agg + T_opp + N_dd < 1000 ? | + | Decision = Test-T0lns = Ndu + Tagg + Topp + Ndd < 1000 ? |
| - | T_tx = now + T_win - N_dd | + | Ttx = now + Twin - Ndd |
| </code> | </code> | ||
| Line 47: | Line 47: | ||
| * ''T0'': packet transmission date by gateway. | * ''T0'': packet transmission date by gateway. | ||
| - | * ''T0_lns'': packet transmission date by gateway estimated by lns. | + | * ''T0lns'': packet transmission date by gateway estimated by lns. |
| * ''now'': packet reception date by LNS. | * ''now'': packet reception date by LNS. | ||
| - | * ''N_du'': //Network max. delay up//: the setting on the dashboard (350ms by default). | + | * ''Ndu'': //Network max. delay up//: the setting on the dashboard (350ms by default). |
| - | * ''T_est'': estimated earliest timestamp for transmission | + | * ''Test'': estimated earliest timestamp for transmission |
| - | * ''T_agg'': Aggregation time: the LNS waits 350ms after the first packet. | + | * ''Tagg'': Aggregation time: the LNS waits 350ms after the first packet. |
| - | * ''T_opp'': Opportunity time: the LNS waits 150ms after the first packet. | + | * ''Topp'': Opportunity time: the LNS waits 150ms after the first packet. |
| - | * ''N_dd'': //Network max. delay down//: the setting on the dashboard (350ms by default). | + | * ''Ndd'': //Network max. delay down//: the setting on the dashboard (350ms by default). |
| * ''Decision'': whether the RX1 window is reachable, 1000ms being the default RX1 value (it can be changed). | * ''Decision'': whether the RX1 window is reachable, 1000ms being the default RX1 value (it can be changed). | ||
| - | * ''T_tx'': the time at which the LNS will send the packet to the gateway. | + | * ''Ttx'': the time at which the LNS will send the packet to the gateway. |
| - | * ''T_win'': the time for the target RX window (1000ms by default for RX1). | + | * ''Twin'': the time for the target RX window (1000ms by default for RX1). |
| ++++ | ++++ | ||
| ++++ Example | | ++++ Example | | ||
| Line 71: | Line 71: | ||
| Computation: | Computation: | ||
| - | * ''T0_lns'' assumed is ''09:59:59.846'' by LNS (''now'' minus 350ms ''Ndu''). | + | * ''T0lns'' assumed is ''09:59:59.846'' by LNS (''now'' minus 350ms ''Ndu''). |
| - | * ''T_est'' without push is ''now'' + 350 + 350 = ''10:00:00.896'' | + | * ''Test'' without push is ''now'' + 350 + 350 = ''10:00:00.896'' |
| - | * ''T_est'' with push is ''now'' + 350 + 150 + 350 = ''10:00:01.046'' | + | * ''Test'' with push is ''now'' + 350 + 150 + 350 = ''10:00:01.046'' |
| - | * Decision: ''T_est'' is greater than 1000ms after ''T0'', so RX1 isn't reachable. | + | * Decision: ''Test'' is greater than 1000ms after ''T0'', so RX1 isn't reachable. |
| - | * Decision: ''T_est'' is less than 2000ms after ''T0'', so RX2 is reachable. | + | * Decision: ''Test'' is less than 2000ms after ''T0'', so RX2 is reachable. |
| - | * ''T_tx'' is ''T0_lns'' + 2000 - 350 = ''10:00:01.496'' (time at which the LNS sends the TX message) | + | * ''Ttx'' is ''T0lns'' + 2000 - 350 = ''10:00:01.496'' (time at which the LNS sends the TX message) |
| Behavior: | Behavior: | ||
| - | * The LNS sends the packet at ''10:00:01.496'' (''T_tx''). | + | * The LNS sends the packet at ''10:00:01.496'' (''Ttx''). |
| - | * The packet forwarder receives it at ''10:00:01.708'' (''T_tx+212ms''). | + | * The packet forwarder receives it at ''10:00:01.708'' (''Ttx+212ms''). |
| * The LoRa frame is sent at ''10:00:02.000'' when the RX2 window opens. Actual timing is done with ''tmst'' (SX1301 clock counter). | * The LoRa frame is sent at ''10:00:02.000'' when the RX2 window opens. Actual timing is done with ''tmst'' (SX1301 clock counter). | ||
| ++++ | ++++ | ||
playground/wiki3/network_delays.txt · Last modified: 2023/05/16 14:23 by ehe
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