Abstract
The cell identity (ID) estimation is one of the essential steps performed by the narrowband-internet of things (NB-IoT) user equipment (UE) during its initial access to the network. The cell ID value is carried by the narrowband secondary synchronisation signal (NSSS) that is periodically transmitted in even radio frames. In this study, the authors proposed a novel technique of cell ID estimation for the NB-IoT UE. The proposed technique is based on a sub-optimal estimator that applies auto-correlation over the received observations and which is 30 times less complex than the optimal maximum likelihood (ML) estimator based on cross-correlation. In addition, they presented three methods that allow the receiver to take advantage of the periodicity of the NSSS. Finally, the advantages and the drawbacks of the presented methods are discussed with a performance analysis through simulation results. Results show that these methods reach the performance of ML with lower overall complexity.
Highlights
The machine-type communication market is growing rapidly due to the high utilization of connected devices
Since P(u = u|q = q) = 0, the errors of cell ID estimation for higher signal to noise ratio (SNR) levels are only due to errors of estimation of q, P = P(q = q). This result indicate that the error probability of cell ID estimation should be split according to the SNR range: one corresponding to low SNR value where P is mainly linked to the error of estimation of u, and one for larger SNR values where the errors of cell ID estimation are mainly due to the errors of estimation of q
We have presented a sub-optimal lowcomplexity cell ID estimator for narrowband-internet of things (NB-internet of things (IoT)), which can be seen as an alternative to the maximum likelihood (ML) exhaustive search
Summary
The machine-type communication market is growing rapidly due to the high utilization of connected devices. The usage of these devices is continuously growing with the expansion of the applications proposed to individuals and industries. To follow the needs of the IoT market, the 3rd generation partnership project (3GPP) has introduced a new cellular technology standard called narrowband-internet of things (NB-IoT) to provide IoT services through wide-area cellular networks. This new system was designed to take into account a maximum number of requirements for the IoT services. A very good indoor coverage, support for a very large number of low-speed connected devices, low latency, very low cost of connectivity, low power consumption and optimized network architecture
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