Method of resolving physical layer collisions in a random access protocol an a corresponding receiver
AssigneeAlcatel
InventorPierre Roux
Life of this patent
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Abstract
The invention relates to a method of resolving collisions between at a receiver, and also to such a receiver. According to the invention, the method performed by the receiver processes the signal representative of a collision. The method consists in particular in selecting signal “fingers” having a power level greater than a threshold value, and in combining said fingers with one another to find configurations for which the packets that result from the combination are error-free, thereby enabling the transmitters from which the colliding packets originated to be identified.
Claims9
A method of resolving collisions between packets transmitted to a receiver by different transmitters using a random access protocol, wherein a signal corresponding to at least two of said packets from different transmitters colliding is received at said receiver, the method comprising:
- selecting fingers of said signal that have a power level greater than a threshold level;
- searching for a first configuration of contributions from said fingers for which a resulting packet from said first configuration is error-free, and identifying a corresponding transmitter which transmitted the resulting packet from said first configuration;
- and
- searching for a second configuration of contributions from said fingers for which a resulting packet from said second configuration is error-free, and identifying a corresponding transmitter which transmitted the resulting from said second configuration and is different from said transmitter which transmitted the resulting packet from said first configuration, said second configuration excluding contributions from said fingers of said first configuration.
A receiver for receiving packets transmitted by different transmitters using a random access protocol, said receiver comprising:
- means for determining from a received signal fingers having a power level greater than a threshold value, said received signal corresponding to at least two said packets from said different transmitters colliding;
- means for searching for a first configuration of contributions from said fingers for which a resulting packet from said first configuration is error-free and a second configuration of contributions from said fingers for which the resulting packet from said second configuration is error-free, wherein said second configuration excludes contributions from said fingers of said first configuration;
- means for identifying a first transmitter which transmitted the resulting packet from said first configuration and a second transmitter which transmitted the resulting packet from said second configuration, wherein said second transmitter is different from said first transmitter.
Dependencies are inferred from the claim text.