Electronic system with a multiple access protocol and method of multiple access

• US 20030048183A1
• Filed: 08/16/2002
• Published: 03/13/2003
• Est. Priority Date: 08/21/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Vollmer, Vasco, Detlefsen, Wolfgang
• Granted Patent: US 7,019,636 B2
• Time in Patent Office: Days
• US Class Current: 340/506
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/43 with synchronous transmission, e.g. time division multiplex [TDM], slotted rings
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 61/5038 for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]

Abstract

The electronic system, especially a security system, includes a number of different units that access a network according to a multiple access protocol, which is designed to minimize collisions between frames while reducing bandwidth requirements. The units may monitor different spatial regions according to several different criteria. Respective units that monitor according to correspondingly different criteria in a given spatial region may be assembled into one group and units that monitor different spatial regions but according to the same criterion may be assembled into another group. Each of the units of the one group are provided access to the network in one concurrent time slot, while the units of the other group are provided access to the network in a different concurrent time slot.

Claims

1. An electronic system comprising at least one first unit (200) for a first spatial region, at least one second unit (500) for a second spatial region, a network (1) in which each of the at least one first unit and the at least one second unit are connected with each other, the first spatial region and the second spatial region being separate from each other, and a multiple access protocol for access of each of the at least one first unit and the at least one second unit to the network, wherein at least one of said at least one first unit and at least one of said at least one second unit are assigned to a single concurrent time slot.

2. The electronic system as defined in claim 1, wherein said at least one first unit includes means for monitoring the first spatial region regarding a first criterion or condition and the at least one second unit includes means for monitoring the second spatial region regarding the first criterion or condition, and wherein the first spatial region and the second spatial region are separate from each other so that the presence of the first criterion or condition in the first spatial region is not correlated with the presence of the first criterion or condition in the second spatial region.

3. The electronic system as defined in claim 1, wherein said at least one first unit is a fire alarm unit, a motion detector or a break-in alarm unit and said at least one second unit is a fire alarm unit, a motion detector or a break-in alarm unit.

7. The electronic system as defined in claim 1, further comprising means for determining a topological distribution of said units connected in said network based on a determination of running time to establish which of said units is said at least one first unit or said at least one second unit and means for assigning at least two of said units to said single concurrent time slot when said at least two of said units are in respective different regions separate from each other.

8. The electronic system as defined in claim 1, further comprising means for determining respective monitoring criteria of said at least one first unit and at least one second unit and means for assigning said units for which said monitoring criteria are uncorrelated to a common concurrent time slot.

9. The electronic system as defined in claim 1, further comprising a central unit for assigning said at least one first unit and said at least one second unit to said single concurrent time slot and wherein said central unit has means for assigning a definite address to each of said units.

4. An electronic system comprising at least one first unit (300) for monitoring a spatial region for the presence of a first criterion, at least one second unit (400) for monitoring said spatial region for the presence of a second criterion, a network (1) in which the at least one first unit and the at least one second unit are connected with each other, and a multiple access protocol for access of the at least one first unit and that at least one second unit to the network, wherein at least one of said at one first unit and at least one of said at least one second unit are assigned to a single concurrent time slot.

5. The electronic system as defined in claim 4, wherein the presence of the first criterion and the presence of the second criterion are not correlated with each other.

6. The electronic system as defined in claim 4, wherein the at least one first unit is a fire alarm unit and the at least one second unit is a motion detector or a break-in alarm unit.

10. A method for accessing at least one first unit and at least one second unit to a network, wherein said at least one first unit includes means for monitoring a first spatial region and at least one second unit includes means for monitoring a second spatial region, wherein the first spatial region and the second spatial region are separate from each other, wherein the accessing takes place by means of a multiple access protocol, and wherein at least one of said at least one first unit and at least one of said at least one second unit are assigned to a single concurrent time slot.

11. The method as defined in claim 10, further comprising monitoring the first spatial region for a first condition or a first criterion by means of the at least one first unit and the second spatial region for the first condition or the first criterion by means of the at least one second unit and wherein the occurrence of the first condition or the first criterion in the first region is not correlated with the occurrence of the first condition or the first criterion in the second region.

12. The method as defined in claim 11, wherein the first criterion or the first condition is the occurrence of fire, a motion or a break-in.

13. A method for accessing at least one first unit for monitoring a spatial region according to a first criterion and at least one second unit for monitoring the spatial region according to a second criterion in a network connecting said at least one first unit and said at least one second unit, wherein the accessing takes place by means of a multiple access protocol, and wherein at least one of said at least one first unit and at least one of said at least one second unit are assigned to a single concurrent time slot.

14. The method as defined in claim 13, wherein said first criterion and said second criterion are not correlated with each other.

15. The method as defined in claim 13, in which said first criterion is the occurrence of fire and the second criterion is the presence of a motion or the occurrence of a break-in.

16. The method as defined in claim 13, further comprising assigning a definite address to each of the units in the network by means of a central unit;

determining a topological distribution of the units in the network by means of the central unit;

determining the respective criteria of the units for monitoring by the units;

assembling respective units for monitoring the same criterion but which are located in corresponding different spatial regions separate from each other into a first group, assembling respective units for monitoring correspondingly different criteria not correlated with each other into a second group, assigning each of the units in the first group to a first concurrent time slot and assigning each of the units in the second group to a second concurrent time slot.

17. The method as defined in claim 16, wherein the determining of the topological distribution occurs by means of running time measurement.

18. The method as defined in claim 16, wherein said determining of the respective criteria of the units for monitoring occurs by retrieval of monitoring information from a data bank or by retrieval of said monitoring information from said units.

19. The method as defined in claim 16, further comprising transmitting respective messages to said units from said central unit and wherein said respective messages contain information regarding corresponding assignments of said units to said first group or said second group.

20. The method as defined in claim 13, further comprising connecting a third unit in the network, which can only be assigned by the multiple access protocol to a time slot to which no other units have been assigned, without concurrent access.

21. A computer program product comprising a computer system and a computer program stored in the computer system, whereby said computer system performs a method according to one of claims 13 to 20, when said computer program is executed.

22. A computer program product comprising a central unit of the network including the units and a computer program stored in the central unit, whereby said computer system performs a method according to one of claims 13 to 20 when said computer program is executed.