Patent ID: 9295028
Filing Date: 2016-03-22
CPC Classification: H04L,H04W

Claim Text:
1. A method comprising: obtaining, by a base station comprising a processor, data relating to a set of collision events on a shared channel for communicating with the base station on a wireless network according to a contention-based access protocol, wherein a plurality of terminals attempt to access the channel contemporaneously, the data comprising a first number representing a number of unsuccessful attempts to access the channel by the plurality of terminals, a second number representing a number of access attempts, and a set of time intervals between access attempts for each of the plurality of terminals, the channel being associated with a set of resource blocks; estimating, by the base station, a probability of collision in the channel based on the first number, the second number, and the protocol; generating, by the base station, a first probability distribution of the time intervals for each of the terminals, based on the estimated probability of collision; calculating, by the base station, a second probability distribution of the time intervals for each of the terminals, based on the data; calculating, by the base station, for each terminal a first cumulative distribution function and a second cumulative distribution function from the first probability distribution and the second probability distribution respectively; comparing, by the base station, the first cumulative distribution function and the second cumulative distribution function for each terminal to identify a malfunctioning terminal not operating in accordance with the protocol; responsive to determining that the base station is in a multi-antenna system and is capable of estimating an angle of arrival of a signal incoming to the base station from the malfunctioning terminal, blocking the signal from the malfunctioning terminal; and responsive to determining that the base station is not in a multi-antenna system or is not capable of estimating an angle of arrival of a signal incoming to the base station from the malfunctioning terminal, re-assigning the channel to a different set of resource blocks and broadcasting information regarding the re-assigning on a broadcast channel.