Wireless private branch exchange (PBX) system ooers wireless telephone access in an ooce environment. In a WPBX, several base stations are connected to the PBX, and the PBX is connected to the public switched telephone network (PSTN). Since only a small number of telephones are expected to be busy at the same time, the capacity (number of the external lines) between the PBX and the PSTN is typi...

In this paper we consider the usage of multiple base stations for IP streaming applications towards wireless terminals. The usage of multiple channels, coming from different base stations, increase the capacity and robustness at the price of an additional IP overhead. Therefore, we advocate to use a novel IP header compression scheme for efficient usage of spectrum resources. We propose the coo...

This paper presents two novel heuristic algorithms for the design of wireless access networks. Emphasis was given to the design of CDMA based wireless networks and Fixed Wireless networks. The objectives of these methods are first to place a number of access points/base stations in a number of candidate sites and then to assign a number of fixed wireless terminals to the selected access points/...

Fujitsu has been developing gallium nitride high electron mobility transistors (GaNHEMT) for small transmitter amplifiers for Long Term Evolution (LTE) base stations. The use of GaN-HEMT in highly efficient transmitter amplifiers has attracted much attention because of its high breakdown voltage characteristics. High-efficiency amplifiers with high gain are needed to decrease the power consumpt...

This paper addresses the displacement of a base station with optimization approach. A genetic algorithm is used as optimization approach. A new representation that describes base station placement, transmitted power with real numbers and new genetic operators is proposed and introduced. In addition, this new representation can describe the number of base stations. For the positioning of the bas...

Cellular communications systems are formed by a collection of transmitters (base stations), each of which ensures the communication with the mobiles in an associated coverage area designated by cell. In a system with an FDM/TDM transmission structure different cells use different frequencies for their operation. To avoid interference, base stations which are geographically close have to use dif...

This paper addresses the displacement of a base station with optimization approach. A genetic algorithm is used as optimization approach. A new representation that describes base station placement, transmitted power with real numbers, and new genetic operators is proposed and introduced. In addition, this new representation can describe the number of base stations. For the positioning of the ba...

A protocol for the reliable multicast of data to mobile hosts is described. A logical ring is maintained between all the base stations that handle the multicast traffic of the same multicast group. A token passing protocol enforces a consistent view between all base stations with respect to the frames that are considered delivered to all mobiles. The interaction of the reliable multicasting and...

In this paper, we investigate the non-line-of-sight (NLOS) propagation identification and correction for time difference of arrival (TDOA) based mobile user location in wireless communication systems. Based on the defined TDOA residual, an NLOS base station identification algorithm is proposed. Different choices of the reference location for the residual calculation are compared via simulation....

Smartphones have become essential devices for the daily activities that the human being performs. Its proliferation has increased the cellular infrastructure in an effort of the mobile operators to satisfy the demand. Due to the cellular network planning is performed considering the peak hour, a large number of base stations are deployed, maintaining the same number of base stations even in low...