Synchronization signal design for narrowband internet of things communications
AssigneeApple Inc.
InventorsUtsaw KUMAR, Seunghee HAN, Debdeep CHATTERJEE, Ralf BENDLIN
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Abstract
A synchronization signal design is described for narrowband Internet of Things Communications. The synchronization signals facilitate time and frequency synchronization between an eNB and UEs. In one example, operations include generating an NB-Iot Secondary Synchronization Signal (N-SSS) using a Zadoff-Chu (ZC) sequence, scrambling the ZC sequence using a scrambling sequence, and transmitting the resulting scrambled NB-Iot Secondary Synchronization Signal (N-SSS) by the eNB in a periodic manner, wherein, the eNB has a cell identifier and the cell is identified by a combination of the root of the ZC sequence and the scrambling sequence.
Claims28
One or more computer-readable media having instructions that, when executed, cause an evolved NodeB (eNB) to perform operations to transmit synchronization signals for time and frequency synchronization between the eNB and user equipments (UEs) for narrowband Internet of things (NB-Iot) comprising:
- generating an NB-Iot Secondary Synchronization Signal (N-SSS) using a Zadoff-Chu (ZC) sequence;
- scrambling the ZC sequence using a scrambling sequence;
- and
- transmitting the resulting scrambled NB-Iot Secondary Synchronization Signal (N-SSS) by the eNB in a periodic manner, wherein, the eNB has a cell identifier and the cell is identified by a combination of the root of the ZC sequence and the scrambling sequence.
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Baseband circuitry of an evolved NodeB (eNB) to perform operations to generate synchronization signals for time and frequency synchronization between the eNB and user equipments (UEs) for narrowband Internet of things (NB-Iot), the baseband circuitry configured to:
- select a Zadoff-Chu (ZC) sequence and a scrambling sequence to represent a cell identifier of the eNB;
- generate an NB-Iot Secondary Synchronization Signal (N-SSS) using the selected Zadoff-Chu (ZC) sequence and scrambling the ZC sequence using the selected scrambling sequence;
- and
- multiplex the resulting NB-Iot Secondary Synchronization Signal (N-SSS) by the eNB into orthogonal frequency division multiplexing (OFDM) symbols in a periodic manner.
One or more computer-readable media having instructions that, when executed, cause an evolved NodeB (eNB) to perform operations to transmit synchronization signals for time and frequency synchronization between the eNB and user equipments (UEs) for narrowband Internet of things (NB-Iot) comprising:
- generating a Zadoff-Chu (ZC) sequence using a root;
- scrambling the ZC sequence using a scrambling sequence;
- and
- transmitting a sequence of NB-Iot Primary Synchronization Signals (N-PSS) by the eNB in a periodic manner, using the scrambled ZC sequence, wherein, the eNB has a current mode of operation (MO) wherein the sequence of the N-PSS indicates the MO.
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Dependencies are inferred from the claim text.