Link adaptation in wireless networks for throughput...

Details Link adaptation in wireless networks for throughput... Link adaptation in wireless networks for throughput...

2004-10-22

2008-12-09

Lugo, David B. (Department: 2611)

Pulse or digital communications

Testing

Signal noise

C375S346000, C455S510000

Reexamination Certificate

active

07463677

ABSTRACT:
The present invention implements a method and system for dynamically adapting the modulation and coding scheme for radio links in a wireless communications network based on a retransmission environment model in order to maximize throughput and most efficiently allocate bandwidth resources. The present invention encompasses a refined calculus and methodology for deriving the link adaptation thresholds in a retransmission environment using a complex model and analysis of the retransmission environment. The present invention holds particular application for wireless data communications as opposed to real time data services because it is based on a retransmission model applicable primarily for data services. A critical component of this new link adaptation system is a “no transmission” cutoff mode that is selected for SIR below a base threshold value. This new mode prevents system instability and misallocation of bandwidth in a wireless communication system.

REFERENCES:
patent: 5541955 (1996-07-01), Jacobsmeyer
patent: 5909469 (1999-06-01), Frodigh et al.
patent: 5914959 (1999-06-01), Marchetto et al.
patent: 6049774 (2000-04-01), Roy
patent: 6208663 (2001-03-01), Schramm et al.
Furuskar et al, System Performance of EDGE, a Proposal for Enhanced Data Rates in Existing Digital Cellular Systems, IEEE, VTC'98, pp. 1284-1289.

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