The present document is a technical report for the work item on additional enhancements for NB-IoT, covering the study on the coexistence of NB-IoT with NR, which is one of the objectives of the WI .
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For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Specify NB-IoT resource reservation for UL/DL FDD/TDD NB-IoT non-anchor carriers, to avoid resource overlap between NR and NB-IoT when NB-IoT is deployed within an NR carrier [RAN1, RAN2, RAN4].
For NB-IoT in-band, guard band and standalone operation co-existence with NR, including the case of NR configured in 15kHz SS Block SCS and the case of 30kHz SS Block SCS as specified in 38.101-1, investigate the following: [RAN4]
15KHz, 30KHz, and 60KHz numerologies for NR FR1 concerned bands, with higher priority given first to 15kHz and then to 30kHz
Channel raster, PRB and subcarrier grid alignment between NB-IoT and NR
Study feasible NB-IoT carrier(s) placement allocation without RF backward compatibility impact and compatible with Rel'13 NB-IoT and Rel'15 NR, to operate simultaneously within various NR channel bandwidths
Study if the +6dB downlink RE power boosting can still be allowed for both in-band and guard band operation modes when co-existing with NR
Synchronization issue between NR and NB-IoT, including timing advance
Frequency band support in NB-IoT and NR
Testability applicable to RF
Coexistence between R15 NR and R13/R14/R15 NB-IoT.