Method for selection of received telegram in train wireless communications system

Patent metadata

Field	Value
Publication number	US-9419690-B2
Application number	US-201314429386-A
Country	US
Kind code	B2
Filing date	Aug 26, 2013
Priority date	Sep 20, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A method for selection of a received telegram in a train wireless communications system including a plurality of wireless base stations situated along the train tracks, for respectively communicating with a higher level device through a wired circuit, and at least one terminal having at least two or more antennas installed in cars of the train moving down the track, during a predetermined transmission interval of a downstream telegram received from a higher level device, the wireless base station twice transmits telegrams that include at least identical content; the terminal, using the plurality of antennas, receives the telegrams transmitted by the wireless base station, selects the received telegram having the best reception from among those received by the plurality of antennas as the received telegram, and transmits a response telegram to the wireless base station, in response to the telegram received from the wireless base station.

First claim

The invention claimed is:

1. A method for selection of a received telegram message in a train wireless communication system comprising: a plurality of wireless base stations arranged along a track of a train, each wireless base station communicating with a higher level device through a wired line; and at least one terminal having at least two or more antennas installed in a car of the train moving on the track, comprising the steps of:
transmitting, by the wireless base station, at least twice a downstream telegram message, which is received from the higher level device, as a telegram message that includes an identical content, during a predetermined transmission interval;
receiving, by the terminal, a first telegram message of the telegram messages transmitted from the wireless base station, with the plurality of antennas, selecting the received telegram message having the best reception condition from among the telegram messages received with the plurality of antennas, and transmitting a response telegram message to the wireless base station in response to the first telegram message received from the wireless base station; and
receiving, by the terminal, a second telegram message of the telegram messages transmitted from the wireless base station, with the plurality of antennas, selecting the received telegram message having the best reception condition from among the telegram messages received with the plurality of antennas, and transmitting a response telegram message to the wireless base station in response to the second telegram message received from the wireless base station;
wherein the terminal station obtains a presence or an absence of BLER and a value of RSSI respectively from the telegram messages received with the plurality of antennas, selects a telegram message having a highest value of RSSI from the received telegram messages having no BLER and, if the telegram message having the highest value of RSSI from the received telegram messages is not found, selects a telegram message having a best reception condition with the plurality of antennas instead of the telegram message having the highest value of RSSI.

Assignees

• Hitachi Int Electric Inc

Inventors

• Okayama Koichiro

Classifications

• H04W4/12

  Messaging; Mailboxes; Announcements · CPC title

• H04W4/046

  Electricity · mapped topic

• H04W88/02

  Terminal devices · CPC title

• H04L1/02

  by diversity reception · CPC title

• H04B7/022 Primary

  Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04) · CPC title