Diff: rfc9442v2.txt - rfc9442.txt

	rfc9442v2.txt	rfc9442.txt

	skipping to change at line 312 ¶	skipping to change at line 312 ¶
	the Sigfox protocol headers. After completing the Uplink	the Sigfox protocol headers. After completing the Uplink
	transmission, the device opens a fixed window for Downlink reception.	transmission, the device opens a fixed window for Downlink reception.
	The delay and duration of the reception opportunity window have fixed	The delay and duration of the reception opportunity window have fixed
	values. If there is a Downlink message to be sent for this given	values. If there is a Downlink message to be sent for this given
	device (e.g., either a response to the Uplink message or queued	device (e.g., either a response to the Uplink message or queued
	information waiting to be transmitted), the Network transmits this	information waiting to be transmitted), the Network transmits this
	message to the device during the reception window. If no message is	message to the device during the reception window. If no message is
	received by the device after the reception opportunity window has	received by the device after the reception opportunity window has
	elapsed, the device closes the reception window opportunity and gets	elapsed, the device closes the reception window opportunity and gets
	back to the normal mode (e.g., continue Uplink transmissions, sleep,	back to the normal mode (e.g., continue Uplink transmissions, sleep,

	standby, etc.)	standby, etc.).

	When a Downlink message is sent to a device, a reception	When a Downlink message is sent to a device, a reception
	acknowledgement is generated by the device, sent back to the Network	acknowledgement is generated by the device, sent back to the Network
	through the Sigfox radio protocol, and reported in the Sigfox network	through the Sigfox radio protocol, and reported in the Sigfox network
	backend.	backend.

	A detailed description of the Sigfox radio protocol can be found in	A detailed description of the Sigfox radio protocol can be found in
	[sigfox-spec], and a detailed description of the Sigfox callbacks/	[sigfox-spec], and a detailed description of the Sigfox callbacks/
	APIs can be found in [sigfox-callbacks]. A Downlink request flag can	APIs can be found in [sigfox-callbacks]. A Downlink request flag can
	be included in the information exchange between the Sigfox network	be included in the information exchange between the Sigfox network
	and Network SCHC.	and Network SCHC.

	3.3.1. SCHC ACK on Downlink	3.3.1. SCHC ACK on Downlink

	As explained previously, Downlink transmissions are driven by devices	As explained previously, Downlink transmissions are driven by devices
	and can only take place following a specific Uplink transmission that	and can only take place following a specific Uplink transmission that
	indicates and allows a following Downlink opportunity. For this	indicates and allows a following Downlink opportunity. For this
	reason, when SCHC bidirectional services are used (e.g., ACK-on-Error	reason, when SCHC bidirectional services are used (e.g., ACK-on-Error
	fragmentation mode), the SCHC protocol implementation needs to	fragmentation mode), the SCHC protocol implementation needs to
	consider the times when a Downlink message (e.g., SCHC	consider the times when a Downlink message (e.g., SCHC

	Acknowledgement (ACK) can be sent and/or received.	Acknowledgement (ACK)) can be sent and/or received.

	For the Uplink ACK-on-Error fragmentation mode, a Downlink	For the Uplink ACK-on-Error fragmentation mode, a Downlink
	opportunity MUST be indicated by the last fragment of every window,	opportunity MUST be indicated by the last fragment of every window,
	which is signalled by a specific value of the Fragment Compressed	which is signalled by a specific value of the Fragment Compressed
	Number (FCN) value, i.e., FCN = All-0 or FCN = All-1. The FCN is the	Number (FCN) value, i.e., FCN = All-0 or FCN = All-1. The FCN is the
	tile index in a specific window. The combination of the FCN and the	tile index in a specific window. The combination of the FCN and the
	window number uniquely identifies a SCHC Fragment, as explained in	window number uniquely identifies a SCHC Fragment, as explained in
	[RFC8724]. The device sends the fragments in sequence and, after	[RFC8724]. The device sends the fragments in sequence and, after
	transmitting FCN = All-0 or FCN = All-1, it opens up a reception	transmitting FCN = All-0 or FCN = All-1, it opens up a reception
	opportunity. The Network SCHC can then decide to respond at that	opportunity. The Network SCHC can then decide to respond at that

	skipping to change at line 1752 ¶	skipping to change at line 1752 ¶
	Sigfox, "Sigfox Callbacks",	Sigfox, "Sigfox Callbacks",
	<https://support.sigfox.com/docs/callbacks-documentation>.	<https://support.sigfox.com/docs/callbacks-documentation>.

	[sigfox-docs]	[sigfox-docs]
	Sigfox, "Sigfox Documentation",	Sigfox, "Sigfox Documentation",
	<https://support.sigfox.com/docs>.	<https://support.sigfox.com/docs>.

	Acknowledgements	Acknowledgements

	Carles Gomez has been funded in part by the Spanish Government	Carles Gomez has been funded in part by the Spanish Government

	through the Jose Castillejo CAS15/00336 grant, the TEC2016-79988-P	through the TEC2016-79988-P grant and the PID2019-106808RA-I00 grant
	grant, and the PID2019-106808RA-I00 grant and by Secretaria	(funded by MCIN / AEI / 10.13039/501100011033) and by Secretaria
	d'Universitats i Recerca del Departament d'Empresa i Coneixement de	d'Universitats i Recerca del Departament d'Empresa i Coneixement de

	la Generalitat de Catalunya 2017 through grant SGR 376.	la Generalitat de Catalunya through 2017 grant SGR 376 and 2021 grant
		SGR 00330.

	Sergio Aguilar has been funded by the ERDF and the Spanish Government	Sergio Aguilar has been funded by the ERDF and the Spanish Government
	through project TEC2016-79988-P and project PID2019-106808RA-I00,	through project TEC2016-79988-P and project PID2019-106808RA-I00,
	AEI/FEDER, EU (funded by MCIN / AEI / 10.13039/501100011033).	AEI/FEDER, EU (funded by MCIN / AEI / 10.13039/501100011033).

	Sandra Cespedes has been funded in part by the ANID Chile Project	Sandra Cespedes has been funded in part by the ANID Chile Project
	FONDECYT Regular 1201893 and Basal Project FB0008.	FONDECYT Regular 1201893 and Basal Project FB0008.

	Diego Wistuba has been funded by the ANID Chile Project FONDECYT	Diego Wistuba has been funded by the ANID Chile Project FONDECYT
	Regular 1201893.	Regular 1201893.

	skipping to change at line 1812 ¶	skipping to change at line 1813 ¶
	1455 De Maisonneuve Blvd. W.	1455 De Maisonneuve Blvd. W.
	Montreal QC H3G 1M8	Montreal QC H3G 1M8
	Canada	Canada
	Email: sandra.cespedes@concordia.ca	Email: sandra.cespedes@concordia.ca

	Diego Wistuba	Diego Wistuba
	NIC Labs, Universidad de Chile	NIC Labs, Universidad de Chile
	Av. Almte. Blanco Encalada 1975	Av. Almte. Blanco Encalada 1975
	Santiago	Santiago
	Chile	Chile

	Email: wistuba@niclabs.cl	Email: research@witu.cl

	Julien Boite	Julien Boite
	Unabiz (Sigfox)	Unabiz (Sigfox)
	Labege	Labege
	France	France

	Email: julien.boite@unabiz.com	Email: juboite@free.fr
	URI: https://www.sigfox.com/	URI: https://www.sigfox.com/

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