Mobility estimation for wireless networks using round trip time (RTT)

We propose an asynchronous, low cost, and accurate mobility estimation scheme for wireless mobile networks. This scheme considers the round-trip time (RTT) of the signal from the mobile station to the base station as observation and estimates position and speed of the mobile user in two dimensions. Our scheme uses an earlier proposed autoregressive mobility model, AR-1 [1], to characterize the movement of mobile users, although, the synchronization requirement between mobile user and base station [1] is no longer necessary when RTT is used instead of Time Of Arrival (TOA) with similar estimation performance. Furthermore, mulitpath propagation environment possess additional problem in mobility estimation especially when no line of sight (LOS) signal is available. In this paper, we have shown the resilience of our estimation scheme in non-LOS scenarios as a function of additional delays due to reflections.