An uplink timing synchronization method for GEO mobile SAT-LTE system

Wang, Jiajia; Chang, Hao; Duan, Hexiang; Ba, Hongbo; Wu, Jianjun

doi:10.1109/icact.2014.6779118

Cited by 4 publications

(1 citation statement)

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“…The applicability of the 3GPP LTE interface to satellite transmission was presented in [3], where an inter transmission time interval (TTI) interleaving technique is used to adapt the retransmission method for the satellite links. Equally important, an uplink synchronization method for a satellite-LTE system was introduced in [4]. Therein, the proposed approach focused on the large beam sizes of the satellite system so as to divide UEs within the beam coverage into groups with respect to their round trip delay (RTD) and then assumed the method for determining the link distances in terrestrial network can be applicable to the NTN.…”

Section: Introductionmentioning

confidence: 99%

Random Access Process Analysis of 5G New Radio Based Satellite Links

Saarnisaari

Laiyemo

Lima

2019

2019 IEEE 2nd 5G World Forum (5GWF)

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Integration of the satellite component into the fifth generation (5G) new radio (NR) system is an ongoing activity within the 3GPP standardization body. However, as the 5G NR system is primarily designed for terrestrial applications, its direct usage with satellite communications may raise problems whose solutions affect its underlying design principles and operation. This paper addresses this adaptation and then analyses the suitability of the 5G NR random access procedure for satellite usage. Although many of the already standardized configuration parameters and procedures are flexible enough and can be used without modifications, the timing advance (TA) calculations, its value transmission, as well as associated timers' configuration require reworking. Furthermore, we also observed the guard interval needed by the physical random access signal may be reduced using the so called minimum common delay that has to be transmitted to the terminals.

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Section: Introductionmentioning

confidence: 99%