Method and system for block ARQ with reselection of FEC coding and/or modulation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsPeter Schramm, Håkan Olofsson, Henrik Andreasson
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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.
Claims29
A method for retransmitting a block of information which was previously transmitted using a first type of modulation, a first type of coding and a first transmission format comprising the steps of:
- (a) selecting at least a second type of modulation different from said first type of modulation to create a retransmission processing scheme;
- (b) processing only said block in accordance with said retransmission processing scheme;
- (c) formatting said processed block in a second transmission format different from said first transmission format to generate a formatted block;
- and
- (d) retransmitting said formatted block.
A method for retransmitting a block of information which was previously transmitted using a first type of modulation and a first type of coding comprising the steps of:
- dividing said block into at least two blocks;
- selecting a retransmission processing scheme comprising a second type of coding and a second type of modulation;
- encoding said at least two blocks using said second type of coding;
- mapping said at least two blocks into a transmission format;
- modulating said mapped blocks using said second type of modulation to generate a modulated signal;
- and
- retransmitting said modulated signal.
A transceiving unit comprising:
- means for receiving a negative acknowledgement signal indicating that a block was erroneously received;
- means for selectively switching from a first modulation/FEC coding scheme to a second modulation/FEC coding scheme different than said first modulation/FEC coding scheme for processing said block in response to said acknowledgement signal;
- and
- means for retransmitting said block after processing using said second modulation/FEC coding scheme, but continuing to transmit other blocks using said first modulation/FEC coding scheme.
A transceiving unit comprising:
- means for receiving a negative acknowledgment signal indicating that a block was erroneously received;
- means for selectively dividing said block into at least two blocks in response to said negative acknowledgment signal;
- and
- means for retransmitting said at least two blocks,
- wherein said block was originally transmitted using a first modulation/FEC coding scheme and only said at least two blocks are retransmitted using a second modulation/FEC coding scheme different from said first modulation/FEC coding scheme.
Dependencies are inferred from the claim text.