Changes between Version 20 and Version 21 of Letibee


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Timestamp:
Nov 5, 2010, 12:27:44 PM (14 years ago)
Author:
Sensei
Comment:

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  • Letibee

    v20 v21  
    1616* An estimated map with the measures obtained at each node side.
    1717
    18 [[Image(cea_wsan.png, 40%, left]]
    19 
    20 | Figure 1 : CEA WSAN + Gateway for Sensei |
     18[[Image(cea_wsan.png, 40%, center]]
     19
     20                                                               Figure 1 : CEA WSAN + Gateway for Sensei
    2121
    2222== Letibee WSAN ==
     23
    2324The WSAN does not use standardized communication protocols. Due to this constraint the communication with a node is not direct but through a virtual connection managed by a gateway (ie : a more powerful node included in the network).
    2425
    2526[[Image(network.png, 60%, center)]]
    2627
    27 LETIBEE network comprises nodes spatially distributed in a 2D area, including anchors with known locations and blind nodes to be positioned. Among anchors, one node generally plays the role of network coordinator and sink, whereas the other references are fixed routers.
    28 The application protocol is mainly centralised, giving the sink a central role since it has to collect all data to display them on the PC connected to it.
     28LETIBEE network comprises nodes spatially distributed in a 2D area, including anchors with known locations and blind nodes to be positioned.
     29Among anchors, one node generally plays the role of network coordinator and sink, whereas the other references are fixed routers.
     30The application protocol is mainly centralised, giving the sink a central role since it has to collect all data from the different nodes and to deliver them on the PC connected to it.
    2931
    3032A specific application protocol was developed for network:
    31 Node discovery.
    32 Route discovery.
    33 Neighbour discovery.
    34 Initial DV-Hop positioning from connectivity information.
    35 Pair-wise RSSI measurements.
    36 Sensors measurements.
     33* Node discovery.
     34* Route discovery.
     35* Neighbour discovery.
     36* Initial DV-Hop positioning from connectivity information.
     37* Pair-wise RSSI measurements.
     38* Sensors measurements.
    3739
    3840=== Contiki and RIME ===
    39 It was decided to port the RIME stack for Contiki v2.4 from SICS onto the LETIBEE node (CEA-Leti based on the Letibee chip, both of them using a 8051 uC). The RIME stack includes the functions for mesh networking including neighbour discovery (and neighbour table construction), route discovery (and routing tables construction) and multi-hop forwarding using the discovered routes. A view of the stack is shown on Figure 2 : RIME network stack.
    40 
    41 [[Image(rime.png, 80%, center)]]
     41It has been decided to port the RIME stack for Contiki v2.4 from SICS onto the LETIBEE node (CEA-Leti based on the Letibee chip, both of them using a 8051 uC).
     42The RIME stack includes the functions for mesh networking including #neighbour discovery# (and neighbour table construction), #route discovery# (and routing tables construction) and #multi-hop forwarding# using the discovered routes.
     43A view of the stack is shown on Figure 2.
     44
     45[[Image(rime.png, 70%, center)]]
    4246
    4347Figure 2 : RIME network stack