Feature #1780

Updated by laforge over 1 year ago

EC-GSM-IoT is a GERAN extension introduced in 3GPP Release 13, aimed at enabling long-range, low-power IoT devices on top of GSM/GPRS/EDGE.

The feature was originally called EC-EGPRS (extended coverage Enhanced GPRS), and only later renamed for marketing reasons.

At the very least, it consists of very significant extensions to the RLC/MAC layer by introducing EC-BCCH, EC-PCH, EC-RACH, EC-AGCH, EC-PACCH, EC-GPRS-TBF

Further Reading:
* M2M_20140630.doc from
* 24.008: Update of NAS timers for EC-GSM:
* EC-EGPRS Multislot:
* 43.064: GP-151212 CR43064 Introduction of Power Efficient Operation and EC-EGPRS, Radio interface (revision of GP-151154).docx of
* 45.003: GP-151180 CR 45.003-0135 rev 2 Introduction of EC-EGPRS (revision of GP-151099).doc of

After a very brief review, it seems that at the very least
* new convolutional coding schemes are introduced for messages in a single burst (rather than the usual 4)
* 'blind retransmissions' are introduced to re-transmit messages up to 28 times
* new logical channels are introduced

i.e. changes to physical layer and RLC/MAC are required.