Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Why 9 LoraMac default channels are specified in EU868 band #49

Closed
FoujanetG opened this issue Feb 26, 2016 · 1 comment
Closed

Why 9 LoraMac default channels are specified in EU868 band #49

FoujanetG opened this issue Feb 26, 2016 · 1 comment

Comments

@FoujanetG
Copy link

Hi,

The LoraWan specification defines 3 default channels(LC1,LC2 and LC3) to guarantee a minimal channelset between and-device and gateways.

In LoraMac-Board.h 9 channels are defined and are used in LoraMac.c.
I don't understand the utility. New channels are sent by the operator, and the range is 863-870MHz.

thanks ,

Guillaume F.
@mluis1
Copy link
Contributor

mluis1 commented Mar 3, 2016

Hi,

You are right the specification only specifies the 3 default channels.

In our implementation we have added the other channels in order to have the motes using all the available modems on the gateway. This was most useful for personalized devices.

Please note also that not every server implementation will send the creation of supplemental channels.

Please also note that even if the server creates new channels over the air and there was already channels defined those should be replaced.

For the next release we have moved those channels definition from the LoRaWAN mac layer implementation to the application layer (main.c file). You can decide if you want to enable by default the creation of those channels or not.

...
#define USE_SEMTECH_DEFAULT_CHANNEL_LINEUP          1

#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 ) 

#define LC4                { 867100000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC5                { 867300000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC6                { 867500000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC7                { 867700000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC8                { 867900000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC9                { 868800000, { ( ( DR_7 << 4 ) | DR_7 ) }, 2 }

#endif

#endif

...
#if defined( USE_BAND_868 )
                LoRaMacTestSetDutyCycleOn( LORAWAN_DUTYCYCLE_ON );

#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 ) 
                LoRaMacChannelAdd( 3, ( ChannelParams_t )LC4 );
                LoRaMacChannelAdd( 4, ( ChannelParams_t )LC5 );
                LoRaMacChannelAdd( 5, ( ChannelParams_t )LC6 );
                LoRaMacChannelAdd( 6, ( ChannelParams_t )LC7 );
                LoRaMacChannelAdd( 7, ( ChannelParams_t )LC8 );
                LoRaMacChannelAdd( 8, ( ChannelParams_t )LC9 );
#endif

#endif

...

@mluis1 mluis1 closed this as completed Mar 11, 2016
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@mluis1 @FoujanetG