Packet transfer control arrangement and related method
First Claim
1. Packet transfer control arrangement to ensure that an information packet transferred from an input to an output of a packet switching network is available in correct form at said output, said arrangement comprising:
- copying means at said input for making at least one complete copy of said information packet in order to obtain at least two complete specimens thereof, each of said complete specimens comprising either a complete original said information packet or a complete copy of said information packet;
transfer means for transferring said at least two complete specimens independently from each other over said packet switching network towards said output, each independently transferred complete specimen being subject to possible loss or corruption as it is being transferred over said packet switching network; and
filtering means at said output for receiving the complete specimens transferred by the transfer means and for filtering out a received one of said complete specimens and applying said received one complete specimen to said output and for discarding any received other complete specimens of the same said information packet, said filtering means further comprising;
a plurality of memory locations,selection means for determining if each complete specimen received at said output has been corrupted and for registering the receipt of a first non-corrupted one of said at least two complete specimens at a selected one of said memory locations and for discarding any other corrupted or non-corrupted said complete specimens of the same said information packet that have also been received at said output, andclearing means for clearing said selected location after a predetermined time interval starting at the receipt of a first one of said at least two complete specimens, thereby making said selected location again available.
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Accused Products
Abstract
The packet transfer control arrangement ensures that an information packet transferred from an input to an output of a packet switching network is available in correct form at that output. It includes copying means (SE11/SEmn) located at the input of the network to make copies of the packet to be transferred, routing means (HA11/HAmn; SE11/SEmn) to transfer these copies independently from each other and possibly over at least partly distinct paths from an input to an output of the network and filtering modules (F11/Fmn) to filter out one of the copies at the output of the network.
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Citations
7 Claims
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1. Packet transfer control arrangement to ensure that an information packet transferred from an input to an output of a packet switching network is available in correct form at said output, said arrangement comprising:
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copying means at said input for making at least one complete copy of said information packet in order to obtain at least two complete specimens thereof, each of said complete specimens comprising either a complete original said information packet or a complete copy of said information packet; transfer means for transferring said at least two complete specimens independently from each other over said packet switching network towards said output, each independently transferred complete specimen being subject to possible loss or corruption as it is being transferred over said packet switching network; and filtering means at said output for receiving the complete specimens transferred by the transfer means and for filtering out a received one of said complete specimens and applying said received one complete specimen to said output and for discarding any received other complete specimens of the same said information packet, said filtering means further comprising; a plurality of memory locations, selection means for determining if each complete specimen received at said output has been corrupted and for registering the receipt of a first non-corrupted one of said at least two complete specimens at a selected one of said memory locations and for discarding any other corrupted or non-corrupted said complete specimens of the same said information packet that have also been received at said output, and clearing means for clearing said selected location after a predetermined time interval starting at the receipt of a first one of said at least two complete specimens, thereby making said selected location again available. - View Dependent Claims (2, 3, 4, 5)
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6. Method for ensuring that an information packet transferred from an input to an output of a packet switching network is available in correct form at said output, said method comprising, for each packet to be protected, the steps of:
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making at least one complete copy of said packet in order to obtain at least two complete specimens thereof, each of said complete specimens comprising either a complete original said information packet or a complete copy of said information packet; transferring said complete specimens over said network to said output;
determining if each complete specimen received at said output has been corrupted;registering the receipt of a first non-corrupted one of said at least two complete specimens at a selected memory location; discarding any other corrupted or non-corrupted said complete specimens of the same said information packet that have also been received at said output; and clearing said selected memory location after a predetermined time interval starting at the receipt of a first one of said at least two complete specimens, thereby making said selected memory location again available. - View Dependent Claims (7)
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Specification