In the coming 6G era, the development of the non-terrestrial network (NTN) is the key to offering a seamless global connectivity even in remote areas where cables or fibers have not reached yet. The NTN involves non-terrestrial flying objects for communication purposes, such as unmanned aerial vehicle (UAV), high altitude platform system (HAPS), and satellite system. Satellite stations can be classified according their orbit altitude from the Earth: Geostationary orbit (GEO), medium Earth orbit (MEO), and low Earth orbit (LEO). It is also noting that HAPs includes aircraft, helicopters and drones. To be more specific, UAVs and HAPs operate at an altitude of around 100 m and 20 km, respectively, while the altitude of satellite is between 200 km and 36,000 km. In particular, the main goal of exploiting the NTN components in three-dimensional (3D) space is to provide high-speed Internet services all around the Earth and future services such as digital replica and metaverse in remote areas where 5G terrestrial networks cannot be covered.
Research topics are listed as follows:
1) Optimization for integrated terrestrial and non-terrestrial networks
2) Interference management in 3D space
3) Adaptive antenna design for LoS MIMO links
In the coming 6G era, the development of the non-terrestrial network (NTN) is the key to offering a seamless global connectivity even in remote areas where cables or fibers have not reached yet. The NTN involves non-terrestrial flying objects for communication purposes, such as unmanned aerial vehicle (UAV), high altitude platform system (HAPS), and satellite system. Satellite stations can be classified according their orbit altitude from the Earth: Geostationary orbit (GEO), medium Earth orbit (MEO), and low Earth orbit (LEO). It is also noting that HAPs includes aircraft, helicopters and drones. To be more specific, UAVs and HAPs operate at an altitude of around 100 m and 20 km, respectively, while the altitude of satellite is between 200 km and 36,000 km. In particular, the main goal of exploiting the NTN components in three-dimensional (3D) space is to provide high-speed Internet services all around the Earth and future services such as digital replica and metaverse in remote areas where 5G terrestrial networks cannot be covered.
Research topics are listed as follows:
1) Optimization for integrated terrestrial and non-terrestrial networks
2) Interference management in 3D space
3) Adaptive antenna design for LoS MIMO links
6G wireless communication systems are expected to support a massive number of connected machines with a diverse set of requirements in terms of delay, throughput, etc. These requirements challenge different aspects of the current cellular networks including the multiple access (MA) methods. A common feature of newly designed MA schemes is the use of non-orthogonal multiple access (NOMA) schemes instead of the conventional orthogonal schemes. Compared to the conventional orthogonal multiple access (OMA) schemes such as TDMA and FDMA, NOMA can scale up the number of served users and increase the spectral efficiency. Recently, rate-splitting multiple access (RSMA) has received much attention from both academia and industry since RSMA has advantages in various systems, e.g., unicast and multicast transmission, cooperative system, a cloud radio access network (C-RAN), mmwave, and massive MIMO system. A main distinct feature of RSMA is the splitting the messages into two part: common and private parts. The all common parts can be combined to one common message which is encoded in a common stream by using codebook shared by all user. The private parts is encoded using private codebook known to only corresponding user.
Research topics are listed as follows:
1) Optimization of RSMA for multicast networks
2) Topological interference management for hyper-connected society