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CC2650: Which chipset (CC1350 or CC2650) suitable for smart city use cases

Kumar K63
Prodigy 60 points
Part Number: CC2650
Other Parts Discussed in Thread: CC1350, , CC1310

Hello community member,

Would you please guide on to choose the suitable chip set & wireless network to cover more than 2-3 KM area which consists of multiple high rise building of 20-25 floors.

This area will have around 3000+ sensor nodes interconnected with each other with multiple collector/Hub nodes, collector node should be connected to cloud via WiFi router & send sensor reading as and when it arrives.

The data from the sensor is not time critical but should reach out to collector with reliability, sensor may sends few bytes of data in every 15 minutes to 1 hour.

I've gone through multiple blogs in this community and learned that CC1350 (Sub 1 GHz) is having  good coverage of KMs, but can collect data from max 50 nodes ( in secure mode), whereas CC2650 (Zigbee) is having better ability to connect more nodes in the network, but complex to implement, and may take longer time to route the message.

I can see my use case can be realized by both the technology causing lots of confusion to select the appropriate chip set for building this use case.

Your direction would really help on taking further steps to build use case.  Please suggest if there is any better solution apart from  above. Also guide on building network topology / best practises to avoid network congestion caused by 3000+ nodes.  Any reference/ white paper would be helpful.

Considering me novice to wireless domain, pl. suggest better approach to take the leap forward.

Thanks!

Kumar

  • 0
    TI__Mastermind 36395 points
    Kumar,

    I would say the CC1310 is a strong candidate to get started with, the biggest issue is the lack of complete solution from TI that will enable you to try this quickly. We simply do not have a solution for 3000 nodes on a single gateway. The TI stack is about 50 now, with security, and maybe 400-500 without security. The limitation is the lack of SRAM to contain the RF link lists during runtime, we are going to improve this with a bigger device coming soon. With this bigger device I think you will be able to reach about 1000 nodes per gateway without security. Then I would recommend that you add application layer security on top of the system to get a final system that is secure.

    An alternative is Contiki, you will find it (github.com/.../contiki). It can do slightly higher node count and it includes Mesh networking and is open source.

    Sorry we do not have a perfect fit, but I hope this helps.

    Regards,
    /TA
  • 0 in reply to TA12012
    Prodigy 60 points

    Thank you TA for your detailed response.  It helped to move forward. Few follow up queries - 

    Is Contiki an alternative to TI-RTOS ( believed to be pre configured in the chip set ) in order to achieve larger nodes through Mesh ?  Do the range & less interference spectrum makes the CC1310 more competent over CC26XX ( zigbee ) or is there any other factors to be considered ?

    Little deviated from the title, but below aspect would help me to choose right chip set for Indian market.  

    Below content is specific to Indian market  

    ------------------------------------------------------------------------------------------------------------------------------------------------

    Regulation for Sub-1 GHz (865-867) band

    "Use of wireless equipment in the band 865 – 867 MHz.- Notwithstanding anything contained in any law for the time being in force, no licence shall be required by any person to establish, maintain, work, possess or deal in Radio Frequency Identification Devices (RFID), on non-interference, non-protection and non-exclusive basis,  in the frequency band 865 – 867 MHz with maximum 1 Watt transmitter power, 4 Watts Effective Radiated Power and 200 kHz carrier bandwidth"

    Regulation for 2.4 GHz band 

    Maximum radiated power output : 100 mW (20 dBm) in Spread of 10 MHz

    Maximum Effective Radiated Power: 26 dBm

    Type of Antenna: Built-in or indoor. 

    Coverage area : Within the single contiguous campus of an individual, duly recognized organization or institution.

    Reference - Official GOI WPC portal 

    http://www.wpc.gov.in/content/85_2_FAQs.aspx#ui-accordion-accordion-header-2

    I would like to verify if said requirements can be solved using these chip set within the regulated boundaries, specifically for Sub GHz band of CC1310. 

    Will greatly appreciate advice on this aspect.

    Thanks

    Kumar

  • 0
    Intellectual 630 points

    We (Thingsquare) have a commercial solution that seems to fit the bill: easily supports thousands of nodes, with full security (no 50-node limitations), has a direct cloud connection, with optional edge deployment, and is very easy to get started with. It supports both the TI CC1310, the CC1350, and the CC2650, but I would recommend the CC1310 in this case for reasons of range and power consumption.

    The CC1310 uses the sub-GHz spectrum, which has less interference than the 2.4 GHz spectrum (CC2650). Read more about the sub-GHz vs 2.4 GHz spectrum in this article:  

    Our system uses wireless meshing to automatically extend the range, so that the a network of CC1310:s will get several kilometers of range, even if the individual CC1310 may have a shorter range. The range depends on many factors, such as the structure of the buildings, the antennas, and how they are mounted.

    Do you plan on using batteries for your sensors? The battery lifetime depends on several factors, but it is possible to get very good lifetime with the TI chips. We have an in-depth article with more information about this subject here: 

  • 0 in reply to Adam Dunkels
    Prodigy 60 points
    Thank you Mr. Adam for your response.
    Articles & links you have provided are very informative. It helped. We'll have our edge nodes install in non trivial locations and thus going to be battery powered.

    Warm Regards,
    Kumar