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wiki:wiki3:faq_multicast_3.x [2019/02/18 14:20] tda created |
wiki:wiki3:faq_multicast_3.x [2019/03/28 11:05] tda |
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| ===== Which gateways are chosen for a C-Multicast DataDown ? ===== | ===== Which gateways are chosen for a C-Multicast DataDown ? ===== | ||
| - | LNS selects gateways according to the following : | ||
| - | * Retrieve all end-devices owned by the group. | + | LNS selects gateways according to the dutycycle and the coverage of each gateway. |
| - | * Retrieve gateways used by these end-devices to send DataUp messages. | + | |
| - | * Check duty cycle. | + | |
| - | * Check DLAllowed. | + | |
| - | * Compute coverage of each gateway. | + | |
| - | * If one gateway covers all end-devices, select it. | + | |
| - | * If several gateways cover all-devices, select the one with with the lower duty cycle. | + | |
| - | * If no gateways cover all end-devices: | + | |
| - | * Remove end-devices not covered by any gateways. | + | |
| - | * Select gateways covering end-devices covered by only one gateway. | + | |
| - | * For remaining end-devices (covered by several gateways), select the gateway with the best coverage. | + | |
| In all cases, a gateway cannot be selected if its duty cycle is over the maximum limit or if downlink is not allowed by its owner. | In all cases, a gateway cannot be selected if its duty cycle is over the maximum limit or if downlink is not allowed by its owner. | ||
| Line 46: | Line 35: | ||
| If a end-device has never transmitted data, it won't be taken into account for the choice of gateways used for multicast DataDown. | If a end-device has never transmitted data, it won't be taken into account for the choice of gateways used for multicast DataDown. | ||
| - | Here are some specific main cases: | ||
| - | |||
| - | * **Case 1** : | ||
| - | * Gateway 1 covers all-devices | ||
| - | * Duty cycle is under its maximum limit | ||
| - | * => **Gateway 1 is selected to send the multicast DataDown message** | ||
| - | {{:wiki3:mcc001_1_gw_full_coverage.png|}} | ||
| - | * **Case 2** : | ||
| - | * Gateway 1 and Gateway 2 cover all end-devices | ||
| - | * Duty cycle is under its maximum limit for both gateways | ||
| - | * Gateway 2 duty cycle is lower | ||
| - | * => **Gateway 2 is selected to send the multicast DataDown message** | ||
| - | {{:wiki3:mcc002_2_gw_full_coverage.png|}} | ||
| - | * **Case 3** : | ||
| - | * Gateway 1 covers all end-devices | ||
| - | * Gateway 2 covers 80% of the end-devices | ||
| - | * Duty cycle is under its maximum for both gateways | ||
| - | * => **Gateway 1 is selected to send the multicast DataDown message** | ||
| - | {{:wiki3:mcc003_2_gw_full_and_partial_coverage.png|}} | ||
| - | * **Case 4** : | ||
| - | * Gateway 1 covers 70% of the end-devices (4, 5, 6, 7, 8, 9, 10) | ||
| - | * Gateway 2 covers 80% of the end-devices (1, 2 ,3 ,4, 5, 6, 7, 8) | ||
| - | * Duty cycle is under its maximum limit for both gateways | ||
| - | * => **Gateway 1 and 2 are selected to send the multicast DataDown message** | ||
| - | {{:wiki3:mcc004_2_gw_partial_coverage.png|}} | ||
| - | * **Case 5** : | ||
| - | * Gateway 1 covers 90% of the end-devices (1, 2 ,3 ,4, 5, 6, 7, 8, 9) | ||
| - | * Gateway 2 covers 70% of the end-devices (1, 2 ,3 ,4, 5, 6, 7, 8) | ||
| - | * Gateway 3 covers 10% of the end-devices (10) | ||
| - | * Duty cycle is under its maximum limit for all gateways | ||
| - | * => **Gateway 1 and 3 are selected to send the multicast DataDown message** | ||
| - | {{:wiki3:mcc005_3_gw_partial_coverage.png|}} | ||
| - | * **Case 6** : | ||
| - | * Gateway 1 covers 90% of the end-devices (1, 2 ,3 ,4, 5, 6, 7, 8, 9) | ||
| - | * Gateway 2 covers 70% of the end-devices (1, 2 ,3 ,4, 5, 6, 7, 8) | ||
| - | * Gateway 3 covers 10% of the end-devices (10) | ||
| - | * Duty cycle is over for Gateway 1 | ||
| - | * Duty cycle is under its maximum limit for Gateway 2 and 3 | ||
| - | * => **Due to its duty cycle, Gateway 1 cannot be used to send the multicast DataDown message. So Gateways 2 and 3 are selected. End-devices 8 and 9 may not be covered.** | ||
| - | {{:wiki3:mcc006_3_gw_partial_coverage_dc_over.png|}} | ||
| ===== Which gateways are choosen for a Unicast DataDown ? ===== | ===== Which gateways are choosen for a Unicast DataDown ? ===== | ||
wiki/wiki3/faq_multicast_3.x.txt · Last modified: 2019/06/21 15:44 by tda
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