Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
1998-07-31
2001-03-27
Decady, Albert (Department: 2784)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
Reexamination Certificate
active
06209112
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to error-correction decoding, and, more particularly, to control of error-correction processing.
2. Description of the Related Art
Many telecommunication applications require transmission of signals between centralized stations handling traffic from a network and remote units providing a communication link for a user to the centralized station. Further, remote units may not necessarily have access to continuous, external power supplies. For example, the remote unit may often be entirely powered by a battery, which must be charged from time to time, or may have a battery as a back-up power source in the event that a main power source is disrupted. Remote units may be, for example, portable personal computers, hand-held radio devices, handheld phones or wireless sets. In addition, new telemetry applications, such as home security monitoring, may have battery power for remote units such as sensors.
Conservation of battery power in battery-powered wireless applications, in particular, is of growing importance. First, such units tend to be small and lightweight, requiring a battery having small physical size. Such batteries tend to also store and make available limited power as a consequence of small size. As is known, the time between recharging these batteries is dependent upon power consumed by the unit. Power consumed, in-turn, is dependent upon an amount of processing performed by the unit, such as call processing, paging and broadcast channel monitoring and memory administration. Typically, units are maintained in an inactive mode until a request to initiate a communication link is made. However, even in an inactive mode, units are often still monitoring common channels of the wireless network, which requires some processing and, hence, power consumption.
One type of processing performed is error-correction encoding in a transmit path and error-correction decoding in a receive path. Error-correction encoding typically requires minimal processing steps, and so error-correction encoding is usually enabled in a transmitter since little power is required. Error-correction decoding, however, is typically computationally intense, requiring substantial power.
SUMMARY OF THE INVENTION
The present invention relates to an apparatus and method of error-correcting data of a datablock. Error-correction in accordance with the present invention includes receiving the datablock comprising a first checksum value and encoded payload, the encoded payload having at least one parity value; calculating a second checksum value for the encoded payload; and comparing the first checksum value with the second checksum value. If the first checksum value is equivalent to the second checksum value, then each parity value is removed from the encoded payload, and the remaining values of the encoded payload are provided as an error-corrected data. Otherwise, error-correction of the encoded payload is enabled in accordance with each parity value to provide the error-corrected data, thereby to conserve a power consumed by the error-correction decoder.
REFERENCES:
patent: 5058110 (1991-10-01), Beach et al.
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patent: 5721743 (1998-02-01), Sharpe et al.
patent: 5852664 (1998-12-01), Iverson et al.
patent: 6035425 (2000-03-01), Caldwell et al.
patent: 6052812 (2000-04-01), Chen et al.
Chase Shelly A
De'cady Albert
Hughes Ian M.
Lucent Technologies - Inc.
Mendelsohn Steve
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