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Wireless Networks
Wireless Network Technologies
In accordance with the progress of mobile terminals, it is expected that the data traffic generated by mobile terminals will increase continuously from now on. In wireless networks, many new technologies have already come into use to efficiently utilize radio resource. Moreover radio resource is further efficiently utilized in heterogeneous networks composed of macro-cell base stations and a large number of small-cell base stations.
In Green Platform Research Laboratories, we investigate wireless communication technologies for LTE and LTE-Advanced to maximize transmission speed and to provide stable communication quality regardless of locations. Some of our developed technologies are proposed at standardization meetings e.g. in 3GPP*1, and some other technologies are used to differentiate our products for wireless networks.
For example, we investigate multiple antenna technologies and coordinated multi-point transmission and reception technologies for heterogeneous networks. In these investigations, we develop scheduling algorithms in MAC-layer and radio resource management technologies which optimize radio resource allocation to a plurality of mobile terminals. Also we investigate SON (Self Organizing Network) technologies to optimize communication quality with reduced labor cost for installation of base stations. In this investigation, we develop 3-dimentional simulator for LTE SON, with which we evaluate our SON technologies in realistic environments. Moreover we investigate technologies for femtocell base stations which provide high-speed communication in indoor areas.
In the future, further evolution of wireless networks can be expected with dynamic allocation of radio resource among different systems and savings of resource and energy. In order to continuously contribute to the evolution, we started investigation of cognitive radio and transmission technologies using a base station with multiple distributed antennas in its service area.
*1 3GPP(3rd Generation Partnership Project): Partnership project to make standard specifications of e.g. LTE Advanced as a 4th generation system
