Antti Lappeteläinen

Low end extension for Bluetooth

Low end extension (LEE) for Bluetooth is a technology to solve a simple mismatch. There are several small devices that could add value by having wireless radio connection to a mobile terminal but cannot bear the power consumption and cost associated with Bluetooth. However, mobile terminals are scheduled to have Bluetooth as the short-range wireless solution. LEE tackles the mismatch by introducing minor additions to the Bluetooth chip in mobile terminals that allows major savings in power consumption and cost in the radios embedded into small devices. Examples of the small devices include wireless sensors, toys, wireless pens etc. This work presents the principles of LEE radio technology and highlights some implementation issues.

A New Symmetric Transceiver Architecture for Pulsed Short-Range Communication

This paper proposes a novel symmetric super- regenerative transceiver architecture for pulsed short-range communication. The proposed architecture is targeted for wireless applications where ultra low power consumption and data-rate in tens of megabits per second are needed over distances in the range of tens of centimeters. The transmitter and receiver are both based on super-regenerative principle and both functions in the transceiver utilize one mutual super-regenerative oscillator. Additionally, the transceiver architecture allows fast synchronization of transceivers thanks to the delayed reflection phenomenon which makes it possible to detect correct timing simultaneously at both ends of the system. Measurement results demonstrate the feasibility of the proposed principle.

Network and content aware information management

The presented approach addresses the problem of query and persistent query (subscription) resolution, taking into consideration distribution across multi-domains, network infrastructure and content management. This approach is particularly suitable for information-centric and cloud computing applications based around a mobile-device infrastructure.

Efficient distributed information management in smart spaces

Development of new technologies brings people new possibilities such as smart spaces. Smart spaces can provide better user experience by allowing a user to connect new devices flexibly and to access all the information in the multi device system from any of the devices. However, this also raises new challenges. The paper considers the problem of efficient distributed information sharing in smart spaces. Models for information distribution are presented together with a simulation framework.

Application of dominant interference cancellation in street microcells

In street microcells, a cochannel interference problem arises especially at the street intersections without base station site where interference level can go up very rapidly due to the possible line-of-sight interference. To guarantee contiguous service quality in the street crossings rather conservative reuse distances should be selected at the expense of lower system capacity. In this paper we show that at the street intersections a single interfering signal dominates suggesting that interference cancellation of the dominant interfering signal is a potential method to overcome the problem. Accordingly, we apply joint detection of the desired and dominant interfering signal in the GSM system and evaluate the potential advantage in the Manhattan microcell environment. The results indicate that this technique enables very low reuse distances in the future high capacity microcellular systems.

Concepts for IP-based radio interface in the BRAIN framework

Considering that mobile communications systems and the Internet are key technologies for the development of the information society, one objective of the European IST project BRAIN is the design of a mobile broadband IP radio interface. This radio interface is based on the ETSI HIPERLAN Type 2 standard with some enhancements necessary to optimise the system for the delivery of IP broadband services with high QoS and mobility requirements. The project is working on optimising layer 2 algorithms and protocols for IP mobile services such as adapted schedulers, optimised handover procedures, handling of a standby mode and specifying a dedicated LP Convergence Layer able to transport efficiently IP version 4 as well as version 6 packets over the air and interworking with LP mobility and QoS functions.