In order to meet more application scenarios and market demands, 3GPP conducted a series of enhancement technologies to NB-IoT in Re-14 and completed the core specifications in June 2017. Enhanced technology adds positioning and multicasting capabilities to provide higher data rates, paging and random access on non-anchor carriers, enhanced connectivity mobility, and support for lower UE power levels.
Positioning function: Positioning service is the basic requirement of many things in the Internet of Things. Based on the location information, many value-added services can be derived. NB-IoT enhancements introduce OTDOA and E-CID positioning techniques. The terminal can report its positioning technology supported by the network to the network, including positioning technologies based on OTDOA, A-GNSS, E-CID, WLAN and Bluetooth. The network side selects a suitable positioning technology according to the capabilities of the terminal and the current wireless environment.
Multicast function: NB-IoT enhances the introduction of multicasting technology in order to more effectively support functions such as message grouping and software upgrade. Multicast technology Based on the SC-PTM of LTE, the terminal receives the bursty service data through the SC-MTCH.
Data Rate Boost: The new capability class UE Category NB2 was introduced in Rel-14. The maximum transport block supported by Cat NB2 UE is increased to 2536 bits on both uplink and downlink. The peak-to-downlink peak rate of a non-anchor carrier can be increased to 140/125 kbps.
Non-anchor Carrier Enhancement: For better load balancing, Rel-14 adds paging and random access to non-anchor carriers. In this way, the network can better support large connections and reduce the probability of random access conflicts.
Mobility Enhancement: NB-IoT Control Plane in Rel-14 The CIoT EPS optimization solution introduces RRC connection reestablishment and S1 eNB RelocaTIon IndicaTIon flow. When the RRC connection is reestablished, the original base station may return the unreserved NAS data to the MME through the S1 eNB RelocaTIon IndicaTIon procedure, and the MME then delivers the NAS data to the UE through the new base station. User plane CIoT EPS optimization scheme in the wireless link failure, the use of LTE in the original switching process data forwarding function.
Lower UE power level: The Rel-14 introduces 14dBm UE power level based on the original 23 / 20dBm power level. This can meet some without extreme coverage conditions, but requires a small battery applications.
China Telecom's Tellabs Terminal Laboratory and all parties in the industry chain work together to provide convenient one-stop test and certification service for NB-IoT terminals in both domestic and international markets. It will continue to promote the commercialization of terminals and the scale application of Internet of Things .
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