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Link Adaptation in Satellite LTE Networks

Gbolahan Aiyetoro1, Giovanni Giambene2, and Fambirai Takawira3
1. Dept. of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal, Durban 4041, South Africa
2. Department of Information Engineering, University of Siena, Via Roma, 56, 53100 Siena, Italy
3. School of Electrical and Information Engineering, University of the Witwatersrand, Johannesburg, South Africa

Abstract—This paper investigates the impact of the Round Trip Propagation Delay (RTPD) in the satellite LTE air interface with the adoption of MIMO technology. The Satellite LTE air interface will provide global coverage and hence complement its terrestrial counterpart in the provision of LTE services to mobile users. A land mobile dual-polarized GEO satellite system has been considered for this work. The link adaption is an important module for the scheduling scheme and the satellite LTE network as a whole in order to make optimal scheduling decisions and effectively utilize the network resources respectively. However, the long RTPD experienced when Channel Quality Indicator (CQI) is reported from the User Equipment (UE) to the eNodeB via GEO satellite causes misalignment between the reported CQI at the eNodeB and the present CQI of the mobile user. The aim of this paper is to investigate the effect of the misalignment as a result of long RTPD through simulations and also investigate the effect of varying CQI reporting interval on the system performance of Satellite LTE network. The possibility of using a fixed CQI rather than an adaptive CQI is also investigated.

Index Terms— CQI, RTPD, GEO satellite, LTE

Cite: Gbolahan Aiyetoro, Giovanni Giambene, and Fambirai Takawira, "Link Adaptation in Satellite LTE Networks," Journal of Advances in Information Technology, Vol. 5, No. 1, pp. 37-43, February, 2014.doi:10.4304/jait.5.1.37-43