Deploying a middleware architecture for next generation mobile systems

Although 2G systems quite adequately cater for voice communications, today demand is for high-speed access to data centric applications and multimedia. Future networks have been designed to provide higher rates for data transmission, but this will be complemented by higher speed access to services via hotspots using secondary wireless interfaces such as Bluetooth or WLAN. With a wide range of applications that may be developed, a growing number of short range wireless interfaces that may be deployed, and with mobile terminals of different capabilities, a means to integrate all these variables in order to facilitate provision of services is desirable. This paper describes an architecture involving the use of middleware that makes software development independent of the specific wireless platfor

Interference due to link management signalling in co-ordinated co-located bluetooth networks

In the normal mode of operation of co-located Bluetooth piconets, nodes in different piconets transmit independently of each other, and thus inband co-channel interference is certain to occur from time to time. Co-ordinated co-located access points (CCAP) however offer significantly higher throughput than both the uncoordinated synchronous and asynchronous cases because an interference avoidance scheme is employed when in the Bluetooth CONNECTION state. However with a CCAP system, some interference is observed to occur when link management protocl signalling (LMP) takes place. The varying amount of interference generated due to link management signalling, the conditions under which it occurs, and how this may be avoided or minimised is examined in this paper. It is shown that under certain conditions, the CCAP scheme still outperforms normal Bluetooth systems even with the inclusion of LMP signalling

High capacity hotspots based on Bluetooth technology

Bluetooth is a short range wireless interface that offers data transmission rates of the order of 721 kbit/s which is comparable with ADSL data rates, but which could be regarded as being too low for deployment as a limited range wireless access point. The capacity of a wireless access point based on Bluetooth technology can be increased significantly by co-locating a number of Bluetooth transducers in a hotspot scenario. This paper describes a technique which reduces mutual interference in co-located Bluetooth transducers by coordinating the hopping frequencies of the individual devices. Such a system can then provide attractive data transmission rates when deployed in wireless access point applications