Operators always were looking into the further development of LTE for high speed connectivity and high data rates. Now since the 2G and 3G networks are at their limits they also look into new categories of LTE as a replacement for those bandwidths. The LTE we are talking about is Cat. 0. But what is it about?
The new LTE categories are fullfilling different needs than high speed LTE. Also the application areas differ from what was a "LTE domain". The new LTE category - named Cat. 0 - is covering narrowband and half duplex operation at reduced data rates.
Low data rate LTE is defined by 3 factors:
These features fit applications that besides low data rate transmit infrequently and are delay tolerant. Therefore this standard idealy supports M2M devices and is referred to as enhancement for Machine Type Communications (MTC).
Cat. 1 Rel. 12 is already available in some networks and commercial deployment is expected in 2016. u-blox TOBY-L1 and TOBY-L2 as well as TOBY-R2 and LARA-R2 can work in Cat. 1 networks. Devices operating in a Cat. 1 networks still fullfill the needs of reasonable data rates and VoLTE.
Currently there are two future categories of low data rate LTE: Cat. 0 Rel. 12 and Cat. 0 Rel. 13.
Cat. 0 Rel. 12 is a modified LTE version for M2M communications. Application running on that network can work on a reduced bandwidth and data rate in half duplex operation. It is also possible to have a single receiver antenna so lower computational resources are needed. A power save state allows the device to go into deep sleep and wake up with minimal network signalling. It also features a signalling overhead reduction for more efficient operation when staying connected or infrequent transmission resulting in lower power consumption.
Cat. 0 Rel. 13 is still in a specification phase with 3GPP (3rd Generation Partnership Project), an initiative that unites telecommunications standard development organizations (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC), known as “Organizational Partners” and provides their members with a stable environment to produce the reports and specifications that define 3GPP technologies. For the release 13 an Extended Discontinuous Reception (DRX) in idle and conntected mode is planned. This would enable devices to go to light sleep for longer and therefore reduce the consumplten when in idle or connected mode.
|Feature||Cat. 1||Cat. 0 Rel. 12||Cat. 0 Rel. 13|
|UE RF Bandwidth||20 MHz||20 MHz||1.4 MHz|
|DL Peak Rate||10 Mbps||1 Mbps||
|Max. no. of DL layers||1||1||1|
|UL Peak Rate||5 Mbps||1 Mbps||
|No. of RF Rx chains||2||1||1|
|Max. UE Tx power||23 dBm||23 dBm||
|Duplex Mode||Full||Half and full duplex||Half and full duplex|
So future applications using LTE Cat. 0 Rel. 13 benefit of the following features: