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14:50 Dec 31, 2010
English to Russian translations [PRO] Tech/Engineering - Telecom(munications)
English term or phrase:chase combining
Hybrid-ARQ: UMTS ARQ defined techniques where when operating in RLC-AM mode, if an RLC-PDU was not acknowledged, the complete RLC PDU was re-transmitted. Hybrid-ARQ uses a similar error-detection capability to detect that a PDU was received in error, but now the originally received data, comprising i information bits and rorig redundancy bits, is combined with subsequent re-transmission to provide improved performance. Using such techniques, the subsequent re-transmission may contain the same (i + rorig) as the original and be combined by a technique called chase combining; alternatively, the re-transmission may contain only incremental redundancy bits, rinc, such that after each re-transmission, the effective coding rate decreases (for example, being i/(i+rorig+rinc) after the first retransmission).