Aktiv-passives Nahfeldkommunikations-Antikollisionsverfahren

Details

Veröffentlichungs-Nr.

EP2827673

Aktenzeichen

EP13368023

Anmeldetag

19. Juli 2013

Veröffentlichung

8. April 2020

Erteilung

8. April 2020

Rechtsraum

EP

IPC

H04W74/06

Abstract

In near field communication between an active initiator (30) and a plurality of passive listen devices (40) the initiator device (30) must obtain a unique identity code from each listen device (40) in range by means of an initialisation process. After establishing an RF field (M) and thereby activating the listen devices the initiator (30) transmits a poll request signal. The poll request signal consists of a sequence of couples. Each couple comprises an identification vector (IVC) and an allocation vector (AVC). Each listen device includes a memory (42) which records control code and an embedded introduction vector (IVL). Each listen device receives the entire poll request signal, and compares each received introduction vector (IVC) with its embedded introduction vector (IVL). When a match is found the listen device calculates a time slot for transmission of its poll response signal based on the allocation vector coupled with the matched introduction vector. The time slot calculated will not overlap with any other time slot so that bit level collisions in the poll response signals will be avoided.

Anmelder

Firma

ST-Ericsson SA

Land

🇨🇭 Schweiz

Fachgebiete