NARROWBAND MACHINE-TO-MACHINE CELL SEARCH

摘要

A method in a wireless device is disclosed. The method comprises receiving a synchronization signal from a network node, the received synchronization signal comprising a synchronization sequence, a cell ID sequence, and a frame index indication sequence. The method further comprises estimating a time offset of the received synchronization signal using the synchronization sequence, and estimating a frequency offset of the received synchronization signal using the synchronization sequence. The method further comprises detecting a cell ID of a cell associated with the network node using the estimated time offset and the estimated frequency offset, and detecting a frame number using the estimated time offset, the estimated frequency offset, and the detected cell ID of the cell associated with the network node.

主权项

1. A method in a network node, comprising:
generating a synchronization signal comprising a synchronization sequence, the synchronization sequence comprising a differentially encoded base sequence comprising one of a Zadoff-Chu sequence, an m-sequence, and a gold sequence, the base sequence further comprising a symbol length and autocorrelation properties, the symbol length and autocorrelation properties configured to allow one or more wireless devices to estimate both a time offset and a frequency offset using the synchronization sequence during synchronization with the network node; and transmitting the generated synchronization signal comprising the synchronization sequence to the one or more wireless devices.