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Merge pull request #37 from Acklio/draft-ietf-lpwan-schc-over-lorawan-11
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Draft ietf lpwan schc over lorawan 11-fix
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Oliv4945 authored Oct 15, 2020
2 parents 2034b4d + 5913a1a commit 27b356f
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14 changes: 10 additions & 4 deletions draft-ietf-lpwan-schc-over-lorawan.md
Original file line number Diff line number Diff line change
Expand Up @@ -361,8 +361,7 @@ reception window.

The FPort field is part of the SCHC Message, as shown in
{{Fig-lorawan-schc-payload}}. The SCHC C/D and the SCHC F/R SHALL concatenate
the FPort field with the LoRaWAN payload to retrieve their payload as it is used
as a part of the RuleID field.
the FPort field with the LoRaWAN payload to recompose the SCHC Message.

~~~~

Expand Down Expand Up @@ -418,7 +417,8 @@ instance the device is required to communicate with. The application can use
additional uplinks or downlink fragmented parameters but SHALL implement at
least the parameters defined in this document.

The mechanism for sharing those RuleID values is outside the scope of this document.
The mechanism for context distribution across devices and gateways is
outside the scope of this document.

## Interface IDentifier (IID) computation {#IID}

Expand Down Expand Up @@ -657,7 +657,7 @@ Packet as described in {{lorawan-schc-payload}}.
the application.

As only 1 tile is used, its size can change for each downlink, and will be
the maximum available MTU.
the currently available MTU.

Class A devices can only receive during an RX slot, following the transmission of an
uplink. Therefore the SCHC gateway cannot initiate communication (e.g., start a new SCHC
Expand Down Expand Up @@ -766,8 +766,14 @@ The format of this uplink is application specific. It is RECOMMENDED for a
device to send an empty frame (see {{lorawan-empty-frame}}) but it is application
specific and will be used by the NGW to transmit a potential SCHC ACK REQ.
SCHC_ACK_REQ_DN_OPPORTUNITY is application specific and its recommended value
<<<<<<< HEAD
is 2, it MUST be greater than 1. This allows for more downlink opportunities
than required by SCHC control traffic, leaving opportunity for any other
downlink with higher priority than SCHC ACK REQ message.
=======
is 2. It MUST be greater than 1. This allows to open a downlink opportunity to
any downlink with higher priority than the SCHC ACK REQ message.
>>>>>>> 0b92a54cc8a5551fcf289f74e1ae3637a2f1c217

_Note_: The device MUST keep this SCHC ACK message in memory until it receives
a downlink SCHC Fragmentation Message (with FPort == FPortDown) that is not a SCHC ACK REQ: it indicates that
Expand Down

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