Bernd Stilling

Exploitation of intracell macrodiversity in mobile radio systems by deployment of remote antennas

Future mobile radio systems require a large number of compact and inexpensive base stations as well as rather complex interference resistant receivers. To achieve low operation and maintenance costs, it is favourable to keep the number of sites with costly signal processing hardware and software to a minimum, which is, however, in contradiction to the just mentioned requirements. This contradiction can be solved when remote antennas, which are connected to central base stations, are deployed. The basic concepts for applying remote antennas to mobile radio systems are considered. Furthermore, the beneficial exploitation of intracell macrodiversity are discussed. Simulation results for both a third generation mobile radio system concept termed JD-CDMA (joint detection code division multiple access) and the most successful second generation mobile radio system GSM (Global System for Mobile Communications) are presented.

Emulation of routing and signaling processes in automatically switched optical networks

Network emulation is a cost-effective method to investigate ASON networks and their protocol software. Various network topologies and scenarios can be analyzed regarding timing, stability and proper functionality. The ASON emulator presented in this paper supports currently the routing protocol OSPF and the signaling protocol CR-LDP. The modular architecture allows an easy integration of other protocol stacks like RSV-PTE.

Versatile emulator for automatically switched optical networks

Development, testing and deployment of routing and signaling protocols for automatically switched optical networks (ASON) are considerably simplified by using an emulation tool. In this paper we present an emulator that supports OSPF routing and (G)MPLS based signaling. Currently the emulator supports the signaling protocol CR-LDP but we are working on the integration of RSVP-TE. Running complete protocol stacks for each emulated node enables the emulator to fill the gap between a network simulation and a real network. To allow the emulation of very large networks which can not be done on a single workstation the network can be emulated using a set of workstation. By adding additional workstations the number of emulated nodes is almost unlimited. The architecture and the functionality of the emulator are described and an example of an emulation is given. The example network with 16 nodes is investigated regarding the behavior in case of network failures.

Exploitation of Systems by Deployment Intracell Macrodiversity of Remote in Mobile Radio Antennas

Future mobile radio systems will require a largenumber of compact and inexpensive base stations as wellas rather complex interference-resistant receivers. Toachieve low operation and maintenance costs, it is favorable to keep the number of siteswith costly signal processing hard- and software to aminimum, which, however, contradicts to just-mentionedrequirements. This contradiction can be solved by deploying remote antennas connected to centralbase stations. In this communication, basic concepts forapplying remote antennas to mobile radio systems areconsidered, and the beneficial exploitation of intracell macrodiversity is discussed.Simulation results for both a third-generation mobileradio system concept termed JD-CDMA (Joint DetectionCode Division Multiple Access) and the most successfulsecond-generation mobile radio system, GSM (Global System forMobile Communications), are presented.

Optical nodes in the PHOTON field trial

PHOTON is one of the ACTS projects which aims at the development of selected concepts for the future transport network and at the implementation of its key functionalities in a field trial for demonstration of the feasibility and validation of the networking ideas. Within the project PHOTON the design of the all-optical nodes for the optical transport network will be demonstrated and verified in the PHOTON field trial called PHOTONET. In PHOTONET, a border crossing star network between Munich and Vienna via Passau will be implemented demonstrating transmission and cross- connection of optical frequency division multiplexed signals over already installed single mode fiber, spanning a distance of 524 km. The optical cross connect (OCC) builds the inner node of the network, connecting several FDM links (multichannel ports) and a number of single channel ports. The latter ones are used for adding local add/drop functionality to the OCC. The principal functions of an OCC are to perform all-optical cross-connecting, optical signal supervision, optical signal regeneration and add/drop functionality. The optical terminal multiplexer (OTMX) builds the interface between the client network and the optical transport network. The basic functions of the OTMX are the provision of the interface to the existing transport networks and to the novel leased optical channel service. The OCC and OTMX architectures are modular, so that any new requests for improvement of their functionality (as frequency conversion or fiber protection switching) can be easily achieved.