Aim at distinguishing the walking status from the idle, or driving, status. Base on the algorithm, Normalized Auto-correlation based Step Counting (NASC), mentioned in [1].
[1] A. Rai, K. K. Chintalapudi, V. N. Padmanabhan, and R. Sen, “Zee: Zero-Effort Crowdsourcing for Indoor Localization,” Proc. 18th Annu. Int. Conf. Mob. Comput. Netw. - Mobicom ’12, p. 293, 2012.