Digital communications
Data networks (2nd ed.)
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue on wireless mobile ATM technologies
IEEE Communications Magazine
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The subject of this paper is the design and evaluation of an efficient errorcontrol scheme for indoor cellular wireless broadband access networks, whichcan be considered as the wireless extension of a fixed quality-of-serviceoriented network (e.g., based on the ATM- (asynchronous transfer mode-)protocol). In order to improve the high and time-variant probability of transmissionerrors, a novel error control scheme is developed. The protocol calledHYPERFLOW (Hybrid Partial sElective Repeat ARQ with Flow control) representsan efficient combination of a selective repeat and a Go-Back-N ARQ- (automaticrepeat request-) scheme while keeping the implementation complexity withinlimits. Additionally, it features a flow control mechanism which prevents the channel from being blocked by a user with momentarily hightransmission error probability and thus considerably increases the totalsystem throughput. Furthermore, the HYPERFLOW-protocol is combined with anadaptive forward error control code. The resulting type II hybrid ARQ-schemeis based on the principle of incremental redundancy with redundant symbolsbeing sent only when they are required.A realistic model for the fluctuations of the transmission quality is used forthe performance evaluation of the HYPERFLOW-protocol. It turns out that the adaptive FEC-based error correction scheme can considerably improve thesystem performance.The mean transmission delay, for instance, can be reduced by a factor of upto 10 when the FEC-scheme is properly applied.