Method and transceiving device for retransmitting erroneous information units in radio links
a technology of information unit and radio link, which is applied in the direction of coding, instruments, code conversion, etc., can solve the problems of poor transmission rate, high fluctuation of mobile phone channel quality, and transmission of erroneous information or information that is being corrupted during transmission, so as to reduce the access delay of packet data services
Inactive Publication Date: 2012-01-10
FAR NORTH PATENTS LLC
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Benefits of technology
This approach reduces access delay and enhances transmission reliability by tailoring code redundancy to the sequence of erroneous units, ensuring faster and more reliable retransmission of data units, outperforming traditional hybrid ARQ schemes in terms of throughput and delay.
Problems solved by technology
Thus, the quality of mobile phone channels is highly fluctuating, so that transmission of erroneous information or information that is being corrupted during transmission is a very common phenomenon.
On the other hand a fast transmission of data other than voice channels, such as in the general packet radio service (GPRS) standard or in the upcoming universal mobile telecommunication system (UMTS) standard, is essential due to a large amount of transferred data and a limited transmission rate.
The higher the number of coded bits the poorer the transmission rate.
First, a rather poor coding is used and only if transmission fails due to erroneous units, a more reliable block code is used.
Method used
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[0026]As shown in FIG. 1 a formatted block Binit of information unit 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 is received, of which four units 1, 4, 5, 8 are identified as being corrupted during transmission and a correction of these not being possible. This erroneous units 1, 4, 5, 8 are selected and in a first step I. a retransmission of these units 1, 4, 5, 8 is requested. The retransmission of the erroneous units 1, 4, 5, 8 is prepared by selecting a set of corresponding code ratings R1, R4, R5, R8 in step II. According to the present invention, these code ratings differ from the code rating of the initial transmission by having less data bits per coded bits, so as to assure a more reliable retransmission. The set of coded bits may consist of code ratings having different numbers of data bits per coded bit. In any case the code rating R1 of the first erroneous units 1 should have the lowest number of data bits per code bits, so as to ensure that the first erroneous unit is retransmitted us...
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The present invention is related to an error handling in transmission of information units in radio links and in particular it is related to an error handling using automatic repeat request (ARQ) and transmission of information units in mobile communication. To reduce the access delay of packet data services, the present invention uses different code ratings according to type II hybrid ARQ for different erroneous information units selected from a formatted block of information units before retransmission. Therefore erroneous information units of a block of information units, that have been transmitted, are selected and the set of selected erroneous information units is divided into a set of n subsets encoded with n code ratings. Advantageously, the retransmission of portions of the formatted block with different code ratings enhances the reliability of the retransmission.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is for entry into the U.S. national phase under §371 for International Application No. PCT / EP01 / 07940 having an international filing date of Jul. 10, 2001, and from which priority is claimed under all applicable sections of Title 35 of the U.S. Code including, but not limited to, Sections 120, 363 and 365(c).[0002]This application is a Reissue application of U.S. Ser. No. 10 / 483,527, filed Jul. 7, 2004, now U.S. Pat. No. 7,200,791, granted Apr. 3, 2007, which is a U.S. National Phase application for PCT / EP01 / 07940, filed Jul. 10, 2001.TECHNICAL FIELD[0003]The present invention is related to an error handling in transmission of information units in radio links and in particular it is related to an error handling using automatic repeat request (ARQ) and transmission of information units in mobile communication.BACKGROUND OF THE INVENTION[0004]In mobile communication, transmission is performed by using a digital modulation t...
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IPC IPC(8): H03M13/00H04L1/18
CPCH04L1/1819H04L1/1835
Inventor WANG, YAN
Owner FAR NORTH PATENTS LLC