Integrated satellite-terrestrial communications networks aim to exploit both the satellite and ground mobile communications, thus providing genuine ubiquitous coverage. For 5G integrated low earth orbit (LEO) communication systems, timing advance (TA) is required be estimated in initial random access procedure order facilitate uplink frame alignment among different users. However, due inherent ...

In recent years, low earth orbit (LEO) satellite constellation systems have been developed rapidly. However, the scarcity of spectrum resources has become one major obstacles to this trend. LEO communication sharing incumbent geostationary (GEO) system is a feasible way alleviate scarcity. Therefore, it practical significance study optimization allocation (RA) in scenario. This paper focuses on...

ROUTING AND NETWORK MOBILITY MANAGEMENT IN NEXT GENERATION SATELLITE NETWORKS Satellite networks are an attractive option to provide broadband telecommunication services to globally scattered users, due to their extensive geographic coverage, high bandwidth availability, inherent broadcast capabilities, etc. Satellites rotating in geostationary orbit (GEO) are very well suited for broadcast ser...

The recent European Telecommunications Standards Institute (ETSI) decision to endorse for the Universal Telecommunication Radio Access ??? (UTRA) techniques based upon wideband-CDMA approaches for terrestrial UMTS (T-UMTS) paired frequency duplexing band will certainly constitute an important driver to orientate the corresponding choice for the satellite UMTS (S-UMTS) component. In this paper i...

Satellite networks offer a number of desirable characteristics including wide area coverage, unique broadcast capabilities, the ability to communicate with hand-held devices, and low cost-per-minute access time, among others. Low Earth Orbit (LEO) satellites are expected to support multimedia traffic and to provide their users with the appropriate Quality of Service (QoS). However, the limited ...

Satellite network, especially low earth orbit (LEO) satellite network, which has advantages of global coverage and short round-trip time (RTT), has played an increasingly important role in the future generation of global communication network. Due to fast velocity, frequent handover and time-varying topology, designing effective routing algorithm for LEO satellite network has always been challe...

To analyze the detection probability of shipborne AIS (automatic identification system) signal from space, a mathematical model dependent upon three factors of message collision avoidance, power of signal received by satellite and interference ratio of signal received is presented in the paper. The altitude and footprint area of the AIS satellite are discussed to overcome the collision of messa...

The implementation of an IP based worldwide network needs the availability of a very efficient satellite segment in order to achieve real global coverage. To this aim the satellite component shall provide flexibility and high link availability. Satellite systems based on the use of geostationary (GEO) or Low Earth Orbit (LEO) constellations suffer from their intrinsic limitations in terms of co...

To meet an increasing demand for multimedia services and electronic connectivity across the world, satellite networks will play an indispensable role in the deployment of global networks. A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above. At th...