Patent ID: 9131497
Filing Date: 2015-09-08
Classification: H04W

Abstract:
1. A method for admission control in a wireless train communication system with TDMA, the method comprising: identifying an intended device for a given device, wherein the intended device communicates with the given device on a first channel at a first frequency; identifying a time slot associated with a communication link in a TDMA frame; identifying unintended devices within neighborhood of the given device that use the time slot; collecting second frequency information for each unintended device, wherein a second channel at a second frequency is associated with each unintended device, wherein the first channel and the second channel are substantially non-overlapping if the first channel and the second channel are not a same channel; collecting first location information associated with the intended device, wherein the intended device is at first location; collecting second location information associated with each unintended device, wherein each unintended device is at respective second location; and determining whether to grant the time slot based on the first frequency, the second frequencies associated with the unintended devices, the first location, and the second locations associated with the unintended devices; wherein said determining whether to grant the time slot is based on frequency differences, wherein each frequency difference corresponds to first difference between the first frequency and each second frequency; wherein a first group is identified and wherein the first group comprises the unintended devices having corresponding frequency differences less than a first frequency threshold; and wherein said determining whether to grant the time slot is based on first distances, wherein the first distances are determined for the unintended devices in the first group and wherein each first distance is derived from third location associated with the given device and each second location for each unintended device in the first group.