Hybrid type-II ARQ/AMS and Scheduling using Channel Prediction on Fading Channels.

Sorour Falahati, CTH, Nilo Casimiro Ericsson, UU Anders Ahlén, UU and Arne Svensson, CTH.

Nordic Radio Symposium 2001 (NRS 01) , Nynäshamn, Sweden, April 3-5 2001.

Outline:

The Wireless IP project within the PCC program studies problems that are crucial in the evolution of UMTS towards high data rates, as well as in future 4G technologies aimed at rapidly mobile terminals. The goal is to attain higher througputs for packet data in particular in downlinks, without bandwidth expansion and while providing acceptable quality of service for various classes of traffic.

Abstract:

In this paper, we propose a system suitable for Internet Protocols (IP) which consists of a hybrid type-II Automatic Repeat reQuest (ARQ) scheme combined with an Adaptive Modulation System (AMS) and a time-slot scheduler supplied by channel predictions, referred to as predictive HARQ-II/AMS. The performance of the system in a downlink for fast fading channels is investigated through simulations where in particular, BER, throughput and delay performance are studied.

The proposed system is compared to two modified systems where one does not utilize Forward Error Correction/ARQ (FEC/ARQ) at link layer (referred to as predictive AMS) while the other one has no access to the channel prediction (referred to as blind HARQ-II/AMS). The results show that with perfect channel prediction both predictive AMS and HARQ-II/AMS satisfy the Quality of Service (QoS) requirements with some advantages to the former in terms of efficient usage of channel capacity. However, when imperfect channel prediction is utilized only our proposed system meets the users demands.

Related publications:

Earlier VTC00-fall paper on the same topic.

Ph.D. Thesis by Nilo Casimiro Ericsson, Oct. 2004.

Licenciate Thesis by Nilo C. Ericsson, June 2001.

Globecom99- paper on scheduling combined with adaptive modulation.

VTC99-fall paper on channel prediction over 1-10 ms horizons.

An overview of the Wireless IP Project, NRS 01.

Source:

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