Method for selecting one or several transponders
First Claim
1. A method for selecting by a base station at least one transponder out of a plurality of transponders, said method comprising the following steps a) to e) performed as a first selection procedure at a first selection level:
- a) controlling by said base station (BS) a first selection procedure, b) producing by each transponder (TR1, TR2, . . . ) a random transponder number, c) generating in said base station (BS) numbered time slots so that each time slot has a time slot number, d) transmitting by each transponder a marker to said base station during a time slot having a respective time slot number coinciding with said respective random transponder number, e) selecting that transponder which was the only transponder transmitting during said coinciding time slot, f) checking, at a second selection level, whether more transponders than one have transmitted a respective marker in the same time slot to provide a respective collision signal, and g) performing, at said second selection level under the control of said base station and in response to said collision signal a second selection procedure as any one of a stochastic, a deterministic, and a mixed stochastic-deterministic selection procedure.
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Accused Products
Abstract
In a method for selecting, by a base station, one or more transponders out of a plurality of transponders, selection steps are performed at least at two selection levels or stages. The base station controls all selection steps at the first and second level. The first selection level includes: each transponder generates a random transponder number, the base station generates numbered time slots, each transponder transmits a marker if and when its random transponder number coincides with a time slot number. When a single transponder random number coincides with a time slot number the respective transponder is selected by the base station. If more than one transponder random numbers coincide with a time slot number the second selection procedure is performed at a second selection level as a stochastic or a deterministic or a mixed stochastic-deterministic selection procedure.
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Citations
22 Claims
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1. A method for selecting by a base station at least one transponder out of a plurality of transponders, said method comprising the following steps a) to e) performed as a first selection procedure at a first selection level:
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a) controlling by said base station (BS) a first selection procedure, b) producing by each transponder (TR1, TR2, . . . ) a random transponder number, c) generating in said base station (BS) numbered time slots so that each time slot has a time slot number, d) transmitting by each transponder a marker to said base station during a time slot having a respective time slot number coinciding with said respective random transponder number, e) selecting that transponder which was the only transponder transmitting during said coinciding time slot, f) checking, at a second selection level, whether more transponders than one have transmitted a respective marker in the same time slot to provide a respective collision signal, and g) performing, at said second selection level under the control of said base station and in response to said collision signal a second selection procedure as any one of a stochastic, a deterministic, and a mixed stochastic-deterministic selection procedure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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12. The method of clam 11, further comprising generating any random transponder number as a random number bit sequence.
Specification