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Super Large CC2530 Network

Chian Ho Lim
Prodigy 170 points
Other Parts Discussed in Thread: CC2530, CC2531, Z-STACK, TIMAC

Hi All, 

We are using CC2530 and CC2531 for our wireless voting system, total 600 units for working at the same time.  We are using the Z-stack 2.4.0 for the many to 1 and 1 to many network setting. And we are facing the issue that the large network can not construct on our lab. 

After we see the video "swrc152.flv", and understand how the large network be formed. If we are not wrong, in Zigbee-Pro mesh network will form base on the RF power level. The higher power RF level will first bind to the Coordinator and so on until ED. If what we assume is correct, and it just explain that why we could not construct a network for 600 units in our lab with just using PCB antenna in CC2530 (router and ED),  chip Antenna for CC2531 (Coordinator).

If this is the case, may I know any parameter could I set to adjust the RF power for making them construct a huge network in our lab? The motivation behind is our wireless voting application(Audience Response System) which will  use all 600 units in a lecture hall. And the distance between each other is a chair's length.

If anyone come across with the similar issue, please provide us some advice. Thanks.

Best regards,

chianho 

  • 0
    TI__Expert 6995 points

    Hi Chianho,

    I agree that turning down the output power of the end nodes is probably a good idea in this application. You need to make sure you still have a pretty good density of routers, though. The RF power can be turned down as a parameter in the Z-Stack.

    Another option for you could perhaps be a star network based on TIMAC (just IEEE 802.15.4 MAC). If this is in a lecture hall, with max output power, I would expect all nodes to be in range of the coordninator. This could simplify your solution and void the need for dedicated routers with mains power around the lecture hall.

    Peder

  • 0 in reply to Peder
    Prodigy 170 points

    Thanks Peder, 

    We consider star topology in the TIMAC initially. But we got 500 EDs to be hook on the Coordinator in star topology which I have no idea could work or not.  Do you have any example code for the TIMAC huge star topology for us to trial? 

    We use Z-stack because the mesh network could easily make 500 units in network and response at the same time. But we are facing issue whereby we know that the mesh network construct is base on the RF power level. In a lecturer hall. Then power level are almost the same. The most we could do is add another external antenna,it make able to create 2 RF power level.

    Please share us any suggestion or advice you had in mind. Thanks.

    Best regards,

    chianho 

  • 0 in reply to Peder
    Prodigy 170 points

    Hi Peder, 

    You are giving us the hint that the Z-stack that we are using is not very suitable for our application (wireless voting system in lecturer hall). Attached is the result we got today, is reinforce what you say? 

    http://e2e.ti.com/support/low_power_rf/f/158/p/89164/390505.aspx#390505

    And I look at the TIMAC, from z-stack to TIMAC, is consider downgrading right. For the application point of view, should not be any issue. But how about the traffic handling? We will like to have 500 devices on the network which could communicate with CC2531. 

    Thanks for your sharing. 

    Best regards,

    chianho