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An adaptive type-II hybrid ARQ/FEC protocol suitable for GSM

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1 Author(s)
Decker, P. ; Commun. Networks, Tech. Hochschule Aachen, Germany

To combat errors in data transmission in mobile radio systems, forward error correction (FEC) and automatic repeat request (ARQ) schemes are combined to hybrid type-I ARQ protocols without using disturbed packets. In poor radio conditions type-I ARQ schemes produce a low throughput with a high delay jitter. Due to these unforeseeable channel delays type-I ARQ protocols are critical for use in cases where timing conditions have to be fulfilled as in speech and e.g. FAX-T30 transmission. Type-II hybrid ARQ (HARQ) protocols combine disturbed and retransmitted packets using FEC methods and limit the mean transmission delay by increasing the throughput. A type-II hybrid ARQ with punctured convolutional codes suitable for GSM data traffic and performance was compared to the recommended radio link protocol (type-I). A new type-II hybrid ARQ protocol is proposed which makes use of the state information given by the equalization process to estimate the amount and best location of the redundancy to be retransmitted

Published in:

Vehicular Technology Conference, 1994 IEEE 44th

Date of Conference:

8-10 Jun 1994

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