Method for communication between central terminal and multiple transponders
First Claim
1. A method of communicating information from first and second transponders to a central monitoring device, the method comprising:
- receiving a starting indication at the first and second transponders;
determining first and second start times for the first and second transponders, respectively, in response to the starting indication; and
transmitting a first set of bursts from the first transponder and a second set of bursts from the second transponder, wherein the bursts of the first set respectively occur at at least some of a first set of potential transmission times within an interrogation time period;
wherein the bursts of the second set respectively occur at at least some of a second set of potential transmission times within the interrogation time period;
wherein each of the potential transmission times of the first set are determined in relation to the first start time, and each of the potential transmission times of the second set are determined in relation to the second start time; and
wherein the potential transmission times of the first set are separated from one another by one of a bit-cell period and a multiple of the bit-cell period, and the potential transmission times of the second set are separated from one another by one of the bit-cell period and a multiple of the bit-cell period.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of communicating information from first and second transponders (or multiple transponders) to a central monitoring device, and a communications apparatus, are disclosed. The method includes receiving a starting indication at the transponders, determining start times for the transponders in response to that indication, and transmitting first and second sets of bursts from the first and second transponders, respectively. The bursts of the first set occur at at least some of a first set of potential transmission times within an interrogation period, and the bursts of the second set occur at at least some of a second set of potential transmission times during that period. Each of the potential transmission times of the burst sets are respectively determined in relation to the start times of the respective transponders. The potential transmission times of the respective burst sets are separated from one another by one of a bit-cell period and a multiple thereof.
69 Citations
21 Claims
-
1. A method of communicating information from first and second transponders to a central monitoring device, the method comprising:
-
receiving a starting indication at the first and second transponders;
determining first and second start times for the first and second transponders, respectively, in response to the starting indication; and
transmitting a first set of bursts from the first transponder and a second set of bursts from the second transponder, wherein the bursts of the first set respectively occur at at least some of a first set of potential transmission times within an interrogation time period;
wherein the bursts of the second set respectively occur at at least some of a second set of potential transmission times within the interrogation time period;
wherein each of the potential transmission times of the first set are determined in relation to the first start time, and each of the potential transmission times of the second set are determined in relation to the second start time; and
wherein the potential transmission times of the first set are separated from one another by one of a bit-cell period and a multiple of the bit-cell period, and the potential transmission times of the second set are separated from one another by one of the bit-cell period and a multiple of the bit-cell period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A communications apparatus comprising:
-
a central monitoring device capable of receiving signals transmitted at first and second sideband frequencies, and capable of transmitting signals at a carrier frequency;
a plurality of transponders capable of receiving the signals transmitted at the carrier frequency, and further capable of sending transmission signals at the first and second sideband frequencies;
wherein each the transmission signals of the respective transponders includes a respective plurality of bursts occurring at at least some of a respective plurality of potential transmission times; and
wherein the potential transmission times of each respective transponder are separated from one another by one of a bit-cell period and a multiple of a bit-cell period, and wherein the potential transmission times of the transponders are at different times so that the bursts of the different transponders do not interfere with one another. - View Dependent Claims (18, 19, 20, 21)
-
Specification