EP0727891A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information data transmission with or without error correction code transmission according to channel quality
Assignee: NEC Corp
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Filing: 1996-02-15
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Granted: —
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Expires: 2016-02-15
Abstract
Abstract In order to transmit information data from a station to another station through a transmission channel, only the information data (a 31 to a 00 , b 31 to b 00 , etc) are transmitted when the channel has a good channel quality. When the channel quality is bad, error correction code words are composed for transmission by adding redundancy bits (A 15 to A 00 , B 15 to B 00 , etc) to the information data. When the channel quality is bad even with transmission of the code words, error correction code blocks are composed by interleaving information bits (a's, b's, etc) and the redundancy bits in a selected number of code words with the selected number increased from two depending on the channel quality. Alternatively, such data, words, or blocks are transmitted with a transmission rate adjusted.
Inventors
- 👤 Masayuki C/O Nec Corp. Kushita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 16:00
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H04L1/22; H04L1/0001; H04L1/0002; H04L1/0009; H04L1/0023; H04L1/0026; H04L1/12; H04L1/16; H04L1/1607; H04L1/1671; H04L2001/125; Y; Y02; Y02D; Y02D30/00; Y02D30/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A source station (11) for transmitting information data to a destination station (15) through a transmission channel (13) in consideration of a channel quality of said transmission channel, characterised in that said source station comprises: first transmitting means (49) for transmitting only said information data when said channel quality is good; and second transmitting means (49) for transmitting, when said channel quality is bad, said information data as error correction code words with each code word composed of each information datum and redundancy bits of a predetermined bit length.
Claim 2
Dependent Claim
83 words
A source station as claimed in claim 1, characterised in that said source station (11) further comprises third transmitting means (55) for transmitting, when said channel quality is bad even with transmission of said code words, said information data as error correction code blocks with each code block composed by interleaving said information datum and said redundancy bits in a selected number of said code words and with said selected number increased one by one from two until said channel quality becomes good.
Claim 3
Dependent Claim
81 words
A source station as claimed in claim 1 or claim 2, characterised in that said source station (11) further comprises transmission rate control means (59) for reducing, when said channel quality is bad even either with transmission of said code words at a transmission rate or with transmission of said code block at a transmission rate and with said selected number set at a selected one of two to a predetermined integer which is not less than two, said transmission rate.
Claim 4
Dependent Claim
45 words
A source station as claimed in claim 3, characterised by buffering means (37) for buffering said information data as buffered data to deliver said buffered data to one of at least said first (49), and said second (49), transmitting means that is put in operation.
Claim 5
Dependent Claim
102 words
A source station as claimed in claim 4, characterised by activating means (27) for activating, when said channel quality is good, said first transmitting means (49) deactivating said second (49) and (if provided) said third (55) transmitting means, for activating, when said channel quality is bad with transmission of only said information data, said second transmitting means deactivating said first and (if provided) said third transmitting means, and (if third transmitting means are provided) for activating, when said channel quality is bad even with transmission of said code words, said third transmitting means and deactivating said first and said second transmitting means.
Claim 6
Dependent Claim
33 words
A data transmission network characterised by a source station (11) as claimed in any preceding claim and a destination station (15) to which the information data is transmitted through a transmission channel (13).
Claim 7
Dependent Claim
105 words
A data transmission network as claimed in claim 6, characterised in that said destination station (15) comprises: receiving means (65) for receiving said error correction code words and blocks as received code words and blocks when said second (49) and said third (55) transmitting means are activated, respectively, either without or with activation of said transmission rate control means (59); and monitoring and correcting means (67) for monitoring a bit error rate of each of said received code words and blocks and for correcting errors in each of said received code words and blocks if said bit error rate indicates the said errors are correctable.
Claim 8
Dependent Claim
61 words
A data transmission network as claimed in claim 7, characterised in that said destination station (15) further comprises channel quality signal transmitting means (75) for transmitting a channel quality signal back to said source station (11) to indicate that said channel quality is good and bad when said error bit rate indicates that said errors are and are not correctable, respectively.
Claim 9
Dependent Claim
33 words
A data transmission network as claimed in any one of claims 6 to 8, characterised in that each of said source (11) and said destination (15) stations is a selectively called wireless station.
Claim 10
Dependent Claim
34 words
A data transmission network as claimed in any one of claims 6 to 8, characterised in that said transmission channel (13) is for transmitting one of a radio frequency signal and an optical signal.
References Cited (Backward Citations)
No citation records indexed.
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