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학술지 Receiver Memory Management Method for HARQ in LTE-based Satellite Communication System
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홍태철, 강군석, 구본준, 장대익
International Journal of Satellite Communications and Networking, v.35 no.1, pp.3-15
John Wiley & Sons
13PR2700, 지상 이동통신을 위한 2.1GHz 위성 주파수 대역 최적 활용기술 개발, 구본준
For the successful deployment of the long term evolution (LTE)-based mobile satellite service, the price of a user terminal is one of the major factors. A user terminal for the LTE-based satellite communication needs to be implemented with a similar hardware size that is used for a terrestrial LTE user terminal. However, for quality of service provision, the satellite user terminal needs a larger size of memories than the terrestrial terminal does. This is very evident by considering that the N-channel stop and wait hybrid automatic repeat request requires proportionally increasing memory size by the propagation delay, resulting in unmanageable amount of memories in the satellite system. To resolve this problem, we propose an efficient memory management method at the user terminal when the size of memory is insufficient. The simulation results in this paper reveal that the proposed method can increase the throughput about 20.7% when a user terminal is operated under very low throughput condition with an insufficient memory size, compared with the case without memory management scheme. In addition, we show that the additional throughput gain can be obtained by the packet scheduling using the information of receiver memory status. Copyright © 2015 John Wiley & Sons, Ltd.
GEO, HARQ, memory management, LTE, satellite communication
KSP 제안 키워드
Hybrid automatic repeat request(HARQ), Long term Evolution(LTE), Memory management, Memory size, Mobile satellite, N-channel, Packet scheduling, Propagation delay, Satellite system, Service Provision, Successful Deployment