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CC1312R: Best radio performance under ETSI 300 220

Felix G.
Intellectual 300 points
Part Number: CC1312R
Other Parts Discussed in Thread: CC1190

Hi,

we think about using the TI-15.4 stack for a smart home application. Because we want to communicate between several floors of the customers house, we have to achieve the best possible range and building penetration.

Further, the radio system should be able to pass the ETSI EN 300-220.

After some investigations, we found two approaches which appear very promissing, for this purpose:

- TI-15.4 Long Range PHY, with Frequency Hopping

- Range Extension with CC1190 on the gateway side

While, as mentioned in ETSI 300-220, the high gain mode could only be used in a smal frequency band (869,400 MHz to 869,650 MHz), the LRM is usable over the hole SRD range (863-870 MHz). In our understanding this in opposition to eachother.

What is the better approach to achieve the best radio performance inside a building, LRM or Range Extention? Is it possible to combine this two technologies within TI-15.4 stack? For example, it would be conceivable, to do FH over the whole 868-band and activate the CC1190 just for the allowed band. Would that be a conceivable approach?

Thank you for helping and best regards

Felix

  • 0
    TI__Mastermind 23646 points

    Hello,

    You can potentialy use them both at the same time, but there will be no way to control the power on specific channels. You can control the power when you send the datareq to the mac layer.

    To my understanding, as long as you are using FH you can send high gain messaages, since the power will be duty cycled through a wider band. if you were to use a mode in which you operate in 1 channel only, then you would need to control the power.

    I recommend you use FH and the PA at the same time and not worry about the channel you are in.

  • 0 in reply to AB
    Intellectual 300 points

    Hi,

    thanks for your response.

    Referring to SWRA542 (2nd paragraph of abstract), ETSI EN 300220 only allows a small band (869.4-to 869.65-MHz) for 27 dBm. As I understood FH, it also uses smal bands but it can switch between different bands. I am not sure if FH and PA together is really compliant to that standard.

  • 0 in reply to Felix G.
    TI__Guru**** 317180 points

    The band you are allowed to send 27 dBm in is fairly narrow and limits you to one channel with about 38.4 kbps to fit the mask. You also have to evaluate the risk of being jammed using this sub band since if you need to use high output power this is the only frequency you can operate on and no opportunity to change frequency if crowded. By only using 14 dBm out gives you a better flexibility on which channel you want to use.  

  • 0 in reply to TER
    Intellectual 300 points
    If I unterstand that correctly, using FH and PA together (within EN 300220) is not intended. So I have to decide which technique to prefer.
    You recommend, better to us FH because of stability against interferences, right?
    Thank you!