Jouni Mikkonen

Cellular access control and charging for mobile operator wireless local area networks

This article presents a system architecture, design considerations, and rationale for a mobile operator wireless LAN. The article also discusses the system implementation and performance issues. The system presented reuses GSM and GPRS mechanisms for user authentication, access control, subscriber management, operator roaming, and billing, while still being compatible with wireless Internet service provider networks and IETF and IEEE protocols such as RADIUS, EAP, and IEEE 802.1x. The architecture is a result of research carried out by Nokia between 1999 and 2002. The designed architecture has also been verified in a complete system implementation.

An integrated QoS architecture for GSM networks

The Internet is evolving towards both the support for mobility and multimedia services with quality of service (QoS) guarantees. While these trends are clearly seen, a relation into the existing network evolution should be understood and exploited. This paper discusses an integrated QoS architecture for GSM networks using the Internet mobility and QoS enhancements in progress. In this context the required entities, distribution of functionalities and interfaces are studied using new GSM packet and high-speed circuit switched data features.

Wireless ATM MAC performance evaluation, case study: HIPERLAN vs. modified MDR

This paper deals with wireless ATM and in particular with channel access mechanisms. The requirements for wireless ATM MAC are discussed, and contention-based and TDMA!reservation based MAC protocols are compared. The objective is to find out the suitability of current radio access technologies for ATM interworking, in comparison to new wireless ATM radio interface proposals. Two channel access mechanisms, EY-NPMA used in HIPERLAN type /, and a modified MDR protocol, are discussed in more detail and their performance in different traffic scenarios is evaluated through simulations.

Wireless ATM MAC performance evaluation, a case study: HIPERLAN type 1 vs. modified MDR

This paper deals with wireless ATM and in particular with MAC (Medium Access Control) mechanisms. The requirements for wireless ATM MAC are discussed, and contention‐based and TDMA/reservation based MAC protocols are compared. The objective is to find out the suitability of current wireless MAC schemes for ATM interworking, in comparison to new wireless ATM MAC proposals. Two candidate mechanisms, EY‐NPMA used in HIPERLAN type 1, and a modified MDR protocol, are discussed in more detail and their performance in different traffic scenarios is evaluated through simulations.

A system scenario for wireless broadband access with multimedia support

Radio access networks are evolving towards the support for mobile multimedia services with quality of service (QoS) guarantees. While this trend is clearly seen, a relation to the fixed network evolution and the legacy wireless systems has to be kept in mind. This paper discusses a general reference scenario for broadband radio access networks with QoS support. In this context the required entities, distribution of functionalities and interfaces are studied in detail using ATM core network and wireless ATM radio access network as example technologies. Finally, an ATM based system demonstrator is discussed.