Method and system for block ARQ with reselection of FEC coding and/or modulation

An information block and retransmission technology, applied in the field of communication systems, can solve problems such as increasing complexity and lack of flexibility, and achieve the effect of reducing the possibility of errors, improving performance, and enhancing protection

Inactive Publication Date: 2000-12-20
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

[0016] While the previously described adaptive systems strive to adapt to changes in the quality of the radio channel, they each have certain drawbacks and limitations
For example, the system described in US Patent No. 5,577,087 can only change the modulation scheme, not to mention the added complexity of using ARQ technology, and it has no flexibility in terms of block segmentation or user bit rate adju

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  • Method and system for block ARQ with reselection of FEC coding and/or modulation
  • Method and system for block ARQ with reselection of FEC coding and/or modulation
  • Method and system for block ARQ with reselection of FEC coding and/or modulation

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Embodiment Construction

[0027]The following exemplary embodiments are presented for a TDMA radio communication system environment. However, those skilled in the art will appreciate that this is done for illustration only, and that the present invention can be used with virtually all types of access methods, including Frequency Division Multiple Access (FDMA), TDMA, Code Division Multiple Access (CDMA) and their combination.

[0028] In addition, European Telecommunications Standards Institute (ETSI) documents ETS 300573, ETS 300574 and ETS 300578 describe the operation of the GSM communication system and are hereby incorporated by reference. Therefore, the description of the operation of the GSM system in connection with the proposed GPRS optimization for packet data (hereinafter referred to simply as "GPRS") is only for further illustration of the present invention. Although an exemplary embodiment of an enhanced GPRS system has been used to describe the present invention, those skilled in the art ...

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Abstract

A communication system supports multiple modulation/coding schemes. When connection quality drops below an acceptable threshold, ARQ techniques use an alternative modulation/coding scheme which is more resistant to noise and/or interference. Flexible resegmentation and mapping of information blocks is supported.

Description

Background of the invention [0001] The present invention relates generally to error handling in the field of communication systems, and more particularly to the use of automatic repeat request (ARQ) in digital communication systems supporting multiple forward error correction coding and / or modulation schemes error handling. [0002] The growth of commercial communication systems, especially cellular radiotelephone systems, has forced system designers to find ways to increase system capacity without degrading communication quality to levels that consumers cannot tolerate. One technique to achieve these goals is to change the analog modulation system to a digital modulation system. [0003] In a wireless digital communication system, the standard air interface specifies most system parameters, including modulation type, burst format, communication protocol, and so on. For example, the European Telecommunications Standards Institute (ETSI) has established the Global System for ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/18
CPCH04L27/0008H04L27/2017H04L1/0006H04L1/1819H04L1/1893H04L27/2071H04L1/12
Inventor P·斯克拉姆H·奥洛夫松H·安德雷松
Owner TELEFON AB LM ERICSSON (PUBL)
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