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DECT NR+ power class and bandwidth/data rate

Mark Szente

Hello,

I have a few questions about the nRF9151 DECT NR+ modem.

  1. I see that from the docs that the max TX power is 19dBm, so it's a Class III device as defined in section 6.2.1 of TS 103 636-2. Is this a hardware limitation, or a a software one due to regulatory compliance or something? 
  2. The docs mention that data rate is up 3.4Mbps. However, the closest value I found in TS 103 636-2 was Table A.4.2-3, which uses the operating bandwidth of 6.912MHz. The docs say the max operating bandwidth of the chip itself is 1.728MHz. Does that mean the docs talk about the capabilities of the DECT NR+ PHY and not the chip in terms of bitrate?  

Thank you.

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  • 0

    Hi,

    I will check this internally and get back to you by the end of this week.

    Best regards,
    Dejan

  • 0 in reply to Mark Szente

    Hi,

    I am sorry for a delayed reply.

    I see that from the docs that the max TX power is 19dBm, so it's a Class III device as defined in section 6.2.1 of TS 103 636-2. Is this a hardware limitation, or a a software one due to regulatory compliance or something?

    Max Tx power of 19 dBm is a current hardware limitation. 

    The docs mention that data rate is up 3.4Mbps. However, the closest value I found in TS 103 636-2 was Table A.4.2-3, which uses the operating bandwidth of 6.912MHz. The docs say the max operating bandwidth of the chip itself is 1.728MHz. Does that mean the docs talk about the capabilities of the DECT NR+ PHY and not the chip in terms of bitrate?

    Maximum theoretical peak data rate is 3.4 Mbps when transmission is scheduled into packets of 4 slots using MCS4, and these 4 slot packets are transmitted back-to-back. In this case, each of the physical layer packets carry 5600 bits which gives the rate of 5600bits / (4*416 us) =3,36Mbit/s. However, there is currently a limitation of scheduling packets back-to-back. Due to this firmware limitation, maximum achievable rate is 2.4 Mbps. Maximum peak data rates with 4 slot packets are 0.552, 1.118, 1.646, 2.222 and 3.360 Mbit/s for MCS0, 1, 2, 3 and 4, respectively.

    Best regards,
    Dejan

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  • 0 in reply to Mark Szente

    Hi,

    I am sorry for a delayed reply.

    I see that from the docs that the max TX power is 19dBm, so it's a Class III device as defined in section 6.2.1 of TS 103 636-2. Is this a hardware limitation, or a a software one due to regulatory compliance or something?

    Max Tx power of 19 dBm is a current hardware limitation. 

    The docs mention that data rate is up 3.4Mbps. However, the closest value I found in TS 103 636-2 was Table A.4.2-3, which uses the operating bandwidth of 6.912MHz. The docs say the max operating bandwidth of the chip itself is 1.728MHz. Does that mean the docs talk about the capabilities of the DECT NR+ PHY and not the chip in terms of bitrate?

    Maximum theoretical peak data rate is 3.4 Mbps when transmission is scheduled into packets of 4 slots using MCS4, and these 4 slot packets are transmitted back-to-back. In this case, each of the physical layer packets carry 5600 bits which gives the rate of 5600bits / (4*416 us) =3,36Mbit/s. However, there is currently a limitation of scheduling packets back-to-back. Due to this firmware limitation, maximum achievable rate is 2.4 Mbps. Maximum peak data rates with 4 slot packets are 0.552, 1.118, 1.646, 2.222 and 3.360 Mbit/s for MCS0, 1, 2, 3 and 4, respectively.

    Best regards,
    Dejan

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