US 2019/0357258 A1 · ANALYSIS METHOD FOR MULTI-USER RANDOM ACCESS SIGNALS

Abstract

An analysis method for multi-user random access signals is disclosed, which solves the connection problem between a base station and a user equipment when the narrow-band IoT uplink signal transmission is implemented. The analysis method of the present invention utilizes the detection threshold value to effectively determine multiple user equipment to be signaled; then, for each detected user equipment, an effective method based on the phase difference is used to estimate their synchronization parameters, i.e. time-of-arrival (ToA) and residual carrier frequency offset (RCFO). Therefore, according to the present invention, random access signals can be received correctly and efficiently and the user equipment related information can be obtained at the same time to facilitate subsequent communications.

Claims7

Dependent claims

An analysis method for multi-user random access signals, which applies to an uplink system of a narrowband Internet of thing (NB-IoT), and which comprises steps:

receiving preamble signals of random access signals from a plurality of user equipment, detecting a plurality of symbol groups of each said preamble signal and acquiring corresponding average power, and comparing said average power with a detection threshold value to determine said user equipment intending to access signals;
and
acquiring a phase trace of said preamble signal corresponding to each of said user equipment intending to access signals, and calculating parameters of Time of Arrival (ToA) and Residual Carrier Frequency Offset (RCFO) according to phase differences of adjacent said symbol groups of said phase trace.

Dependencies are inferred from the claim text.

Analysis method for multi-user random access signals

Life of this patent

Analysis method for multi-user random access signals

Life of this patent

Abstract

Claims7