Comments (3)
xg590
commented on August 17, 2024
According to my understanding of LoRa theory, it is difficult to do collision detection before sending. If two senders contest the same channel, there will be PayloadCrcError. A simple search <https://www.thethingsnetwork.org/forum/t/do-lora-wan-nodes-perform-any-activity-detection-and-or-collision-detection/1353/3> led to a similar conclusion. I think we have to do a retransmission if there is a CrcError.
In addition, there is a CAD mechanism for the SX1276 chip but I do not understand how it would be helpful. The datasheet says it listens the preamble of on-going transmission during CAD state but that elusive preamble only lasts for a few milliseconds. If one SX1276 is transmitting (preamble transmission is over), I don't think other SX1276 chips can detect the on-going transmission (payload is being transmitting).
What do you think?
Best,
Xiaokang.
…On Wed, Dec 21, 2022 at 7:17 AM ATONU GHOSH ***@***.***> wrote:
I have setup two or more nodes sending data to a single node. A lot of
collisions occur and "PayloadCrcError" shows up. But why does it get stuck
at this?
Also, is there a way to receive maximum data from multiple nodes?
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xg590
commented on August 17, 2024
I believe "Transmit only if asked by a master node" is a good idea to
gather data from multiple slave nodes.
…On Wed, Dec 21, 2022 at 7:17 AM ATONU GHOSH ***@***.***> wrote:
I have setup two or more nodes sending data to a single node. A lot of
collisions occur and "PayloadCrcError" shows up. But why does it get stuck
at this?
Also, is there a way to receive maximum data from multiple nodes?
—
Reply to this email directly, view it on GitHub
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atonughosh
commented on August 17, 2024
I believe "Transmit only if asked by a master node" is a good idea to gather data from multiple slave nodes.
…
On Wed, Dec 21, 2022 at 7:17 AM ATONU GHOSH @.> wrote: I have setup two or more nodes sending data to a single node. A lot of collisions occur and "PayloadCrcError" shows up. But why does it get stuck at this? Also, is there a way to receive maximum data from multiple nodes? — Reply to this email directly, view it on GitHub https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_xg590_SX1276_issues_6&d=DwMCaQ&c=slrrB7dE8n7gBJbeO0g-IQ&r=68-jaezqLTx9tGFv4ExwCQ&m=v_iPkGDQ_J2cUqZSk5qD0mX0va1rplvPuOUNilsoBfkVFlLSf_cIwGSfMuxgGjek&s=6FcI7ZUm3JjokO5Z-RFDBwQcL3LU7-ICXD4ReoivJQ8&e=, or unsubscribe https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_notifications_unsubscribe-2Dauth_AKJHY6HTCTHNAU5KCWMR4Q3WOLYNNANCNFSM6AAAAAATFR5QYE&d=DwMCaQ&c=slrrB7dE8n7gBJbeO0g-IQ&r=68-jaezqLTx9tGFv4ExwCQ&m=v_iPkGDQ_J2cUqZSk5qD0mX0va1rplvPuOUNilsoBfkVFlLSf_cIwGSfMuxgGjek&s=oTrvpE4iSZ6uL2D-9TUPShwNCQBk8MlneAuYA7QPyHs&e= . You are receiving this because you are subscribed to this thread.Message ID: @.>
Exactly what I was thinking.
Thanks
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Related Issues (13)
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