[특허]Method for superimposing a sequence number in an error detection code in a data network

[미국특허] Method for superimposing a sequence number in an error detection code in a data network 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03M-013/00
출원번호	US-0697731 (2000-10-25)
§371/§102 date	20010216 (20010216)
발명자 / 주소	Cassiday, Daniel R. Rettberg, Randall D. Satterfield, David L. Moser, Thomas J.
출원인 / 주소	Sun Microsystems, Inc.
대리인 / 주소	Meyertons Hood Kivlin Kowert &
인용정보	피인용 횟수 : 14 인용 특허 : 13

초록 ▼

A system and method for superimposing a sequence number of a packet into the CRC segment of the packet thereby allowing more bandwidth in the payload portion of the packet for carrying data is described. Also described is a method of acquiring additional information on the type of error in a packet, e.g., data transmission errors or sequence errors, from analyzing a CRC error. For example, a reported CRC error can be the result of the receipt of a packet with a sequence number the receiver is not expecting (which is a normal occurrence on transmission links due to transmitters resending packets that a receiver has already accepted) or can result from a real error in the transmission of a packet. A first error code check (CRC) value is calculated for the payload segment of a data packet. A second CRC value is calculated for the sequence number of the data packet. The first CRC value and the second CRC value are combined thereby creating a third CRC value. The third CRC value is then combined with the payload segment of the data packet thereby creating a data packet that can be transmitted across the link.

대표청구항 ▼

1. A method of preparing a data packet for transmission over an interconnect link, the method comprising:calculating a first CRC value for a payload segment of a data packet; calculating a second CRC value for a sequence number of the data packet; combining the fist CRC value and the second CRC value thereby creating a third CRC value, and combining the third CRC value with the payload segment of the data packet thereby creating a transmittable data packet. 2. A method as recited in claim 1 further comprising extracting a plurality of inversion bits from the data packet before calculating the first CRC value for the payload segment.3. A method as recited in claim 1 further comprising extracting the sequence number from the data packet before calculating the second CRC value for the sequence number thereby allowing more space in the payload segment for data.4. A method as recited in claim 3 wherein the sequence number produces a 30-bit CRC value.5. A method as recited in claim 1 wherein combining the first CRC value and the second CRC value further includes performing an exclusive OR between the first CRC value and the second CRC value thereby producing the third CRC value.6. A method as recited in claim 1 wherein combining the third CRC value with the payload segment results in a 77-bit data segment.7. A method as recited in claim 1 further comprising inserting a plurality of inversion bits into the transmittable data packet, wherein the plurality of inversion bits maintain DC balance and control run length.8. A method of decoding an encoded message received over an interconnect link in a network, the method comprising:receiving an encoded data packet having a received CRC segment and a payload segment; calculating a first CRC value using the payload segment; decoding the first CRC value using a plurality of inversion bits; decoding the received CRC segment using the plurality of inversion bits; comparing the decoded first CRC value and the decoded received CRC segment thereby determining whether the encoded message was received with any errors. 9. A method as recited in claim 8 further comprising removing the plurality of inversion bits from the encoded message.10. A method as recited in claim 8 further comprising determining whether an error in the encoded message resulted from a transmission error.11. A method as recited in claim 10 further comprising comparing a first plurality of preselected bits in the decoded received CRC segment with a second plurality of preselected bits in the decoded first CRC value.12. A method as recited in claim 11 wherein both the first plurality of preselected bits and the second plurality of preselected bits have the same bit positions.13. A method as recited in claim 8 further comprising determining whether an error in the encoded message resulted from a non-transmission error.14. A method as recited in claim 13 further comprising comparing a third plurality of preselected bits in the decoded received CRC segment with a fourth plurality of preselected in the decoded first CRC value.15. A method as recited in claim 13 wherein both the third plurality of preselected bits in the decoded received CRC segment and the fourth plurality of preselected bits in the decoded first CRC value have the same bit position.16. A method as recited in claim 8 wherein the decoded first CRC value and the decoded received CRC segment have 30 bits wherein the 30 bits includes a CRC value for sequence number.

이 특허에 인용된 특허 (13) 인용/피인용 타임라인 분석

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[미국특허] Method for superimposing a sequence number in an error detection code in a data network 원문보기

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[미국특허] Method for superimposing a sequence number in an error detection code in a data network 원문보기

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이 특허에 인용된 특허 (13) 인용/피인용 타임라인 분석

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