Method and device for efficient error correction in a packet-switched communication system
First Claim
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1. A novel method for error correction in a packet-switched communication system, comprising the steps of:
- A) transmitting, by a subscriber unit, a packet to a base site using a segment-level error correction scheme;
B) assembling, by the base site, constituent segments of a packet;
C) determining whether a packet-level error detection code indicates that a packet is error-free;
D) where the packet-level error detection code indicates that the packet is error-free, passing, by the base site, the packet to open systems interconnection layer 3, and where the packet-level error detection code indicates that the packet is in error, broadcasting, by the base site, information indicating that an error has occurred; and
E) where the subscriber unit receives information indicating that an error has occurred, retransmitting the packet by returning to step A, and where the subscriber unit fails to receive information indicating that an error has occurred, packet transmission by the subscriber unit has been completed.
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Abstract
The method and device of the present invention provide for efficient error correction in a packet radio system by 1) eliminating wasted bandwidth due to the unnecessary retransmissions that occur as a result of lost positive acknowledgments, 2) occupying less downlink bandwidth than a scheme requiring positive acknowledgments, and 3) minimizing packet delay by providing two levels of error correction at the datalink layer.
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Citations
15 Claims
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1. A novel method for error correction in a packet-switched communication system, comprising the steps of:
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A) transmitting, by a subscriber unit, a packet to a base site using a segment-level error correction scheme; B) assembling, by the base site, constituent segments of a packet; C) determining whether a packet-level error detection code indicates that a packet is error-free; D) where the packet-level error detection code indicates that the packet is error-free, passing, by the base site, the packet to open systems interconnection layer 3, and where the packet-level error detection code indicates that the packet is in error, broadcasting, by the base site, information indicating that an error has occurred; and E) where the subscriber unit receives information indicating that an error has occurred, retransmitting the packet by returning to step A, and where the subscriber unit fails to receive information indicating that an error has occurred, packet transmission by the subscriber unit has been completed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device in a subscriber unit for implementing a novel method for error correction in a packet-switched communication system comprising:
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A) a segment transmitter for transmitting a plurality of segments comprising a packet to a base site that, upon determining that the packet is in error, broadcasts a negative acknowledgment, NACK, in a superframe header of the packet; B) a negative acknowledgment unit, coupled to receive the plurality of segments from the segment transmitter and to a superframe header decoder, for generating a plurality of clear buffer signals and retransmission signals in accordance with a predetermined scheme; C) the superframe header decoder, coupled to the negative acknowledgment unit, for determining presence/absence of a negative acknowledgment in a superframe header of the packet and generating a presence/absence signal indicating said presence/absence to the negative acknowledgment unit. - View Dependent Claims (15)
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Specification