Method for Radio Transmission in a Radio Cell of an Alarm System

• US 20080070547A1
• Filed: 09/18/2007
• Published: 03/20/2008
• Est. Priority Date: 09/18/2006
• Status: Abandoned Application

• Current Assignee: Siemens Building Technologies Fire & Security Products GmbH & Company OHG
• Original Assignee: Siemens Building Technologies Fire & Security Products GmbH & Company OHG
• Inventors: Schreyer, Karlheinz
• Application Number:
  US11/857,032
• Publication Number:
  US 20080070547A1
• Time in Patent Office: Days
• US Class Current: 455/404.2
• CPC Class Codes: G08B 25/007 Details of data content structure of message packets; data protocols
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence

Abstract

A method for radio transmission in a radio cell of an alarm system uses a time slot for communication between users or with a radio cell central unit that is subdivided into a first main area and a second main area. At least two of the users send routine signals to the radio cell central unit within the first main area, before detector data is transferred to the radio cell central unit or to another user in the second main area. This enables more users to be operated in the radio cell, with the reaction time remaining the same and lower power consumption of the peripheral elements.

Claims

1. A method for radio transmission in a radio cell of an alarm system, which comprises the steps of:

transmitting detector data from users to a radio cell central unit as well as addresses identifying the users, so that the radio cell central unit on a basis of the detector data received, can control measures to counter a danger;

undertaking the transmitting step in a predetermined time frame determined by a system clock assigned to the radio cell central unit;

periodically sending in turn in the predetermined time frame a routine signal for checking system integrity in an assigned detector time slot to the radio cell central unit by the users; and

after a transmission of the routine signal by a first user, at least one second user sending a further routine signal to the radio cell central unit, and only subsequently does a user wishing to send sends its detector data to the radio cell central unit or to another user.

2. The method according to claim 1, which further comprises configuring the predetermined time frame so that periodically repeating time slots are used which are made up of a first main area and a second main area, with at least two of the users able to transmit the routine signals within the first main area to the radio cell central unit and the second main area being available for transmission of the detector data.

3. The method according to claim 2, which further comprises dividing the first main area into detector time slots and each of the users in the alarm system is assigned a fixed one of the detector time slots and a respective user transfers its routine signal to the radio cell central unit in the assigned fixed detector time slot.

4. The method according to claim 3, wherein no detector data is communicated in the assigned fixed detector time slots.

5. The method according to claim 3, which further comprises notifying all of the users in the alarm system about which of the users are using which of the fixed detector time slots.

6. The method according to claim 2, wherein within the second main area a precisely-defined point in time is agreed to, at which a user wishing to send can establish contact with another user or to the radio cell central unit.

7. The method according to claim 1, which further comprises obtaining time information required for synchronization between the users from an exchange of data by the routine signals.

8. The method according to claim 2, wherein the radio cell central unit, after receiving all of the routine signals of all of the users sent out in the first main area, sends out a joint acknowledgement signal to all of the users.