Narrowband LTE cell search

A method of operation of a base station in a wireless network, comprising:

• transmitting a narrowband Primary Synchronization Signal, NB-PSS, and a narrowband Secondary Synchronization Signal, NB-SSS, in a narrowband portion of a downlink system bandwidth, wherein:
• multiple occurrences of the NB-PSS and multiple occurrences of the NB-SSS are transmitted over a defined time interval;
• each occurrence of the NB-PSS is transmitted over multiple contiguous Orthogonal Frequency Division Multiplexing, OFDM, symbols and each occurrence of the NB-SSS is transmitted over multiple contiguous OFDM symbols;
• and
• for each occurrence of the NB-SSS, a NB-SSS sequence for the occurrence is a function of only one particular location out of four possible locations of the occurrence of the NB-SSS within the defined time interval.

A wireless device in a wireless network, comprising:

• a processor;
• and
• storage that stores instructions executable by the processor whereby the wireless device is operable to:
• perform a cell detection procedure based on a narrowband Primary Synchronization Signal, NB-PSS, and a narrowband Secondary Synchronization Signal, NB-SSS, received in a narrowband portion of a downlink system bandwidth, wherein:
• multiple occurrences of the NB-PSS and multiple occurrences of the NB-SSS are transmitted over a defined time interval;
• each occurrence of the NB-PSS is transmitted over multiple contiguous Orthogonal Frequency Division Multiplexing, OFDM, symbols and each occurrence of the NB-SSS is transmitted over multiple contiguous OFDM symbols;
• and
• for each occurrence of the NB-SSS, a NB-SSS sequence for the occurrence is a function of only one particular location out of four possible locations of the occurrence of the NB-SSS within the defined time interval.

A method of operation of a wireless device in a wireless network, comprising:

• performing a cell detection procedure based on a narrowband Primary Synchronization Signal, NB-PSS, and a narrowband Secondary Synchronization Signal, NB-SSS, received in a narrowband portion of a downlink system bandwidth, wherein:
• multiple occurrences of the NB-PSS and multiple occurrences of the NB-SSS are transmitted over a defined time interval;
• each occurrence of the NB-PSS is transmitted over multiple contiguous Orthogonal Frequency Division Multiplexing, OFDM, symbols and each occurrence of the NB-SSS is transmitted over multiple contiguous OFDM symbols;
• and
• for each occurrence of the NB-SSS, a NB-SSS sequence for the occurrence is a function of only one particular location out of four possible locations of the occurrence of the NB-SSS within the defined time interval.