Location service is an essential prerequisite for mobile wireless ad hoc networks (MANETs) in which the underlying routing protocol leverages physical location information of sender and receiver nodes. Fulfillment of this requirement is challenging partly due to the mobility and unpredictability of nodes in MANETs. Moreover, scalability and location information availability under various circum...

Wireless communications are nowadays one of the most skyrocketing sectors in the communications market and research areas. Due to constant technical advances, mobile terminals have become something indispensable. It is already in the past when the number of wireless terminals clearly exceeded the number of fixed terminals for the first time and, in recent years, operators have been experiencing...

This paper presents a generic service which allows a device to discover the location of other devices in an ad hoc network. The service has advantages in a variety of scenarios, since it does not rely on location infrastructures such as GPS satellites or GSM cellular base stations. An outline of the technology that will be needed to realise the service is given, along with a look at the fundame...

WLAN-based location systems are implemented in indoor location service in recent years. These systems suffer largely from the signal disturbance under open WLAN environment, which introduces decrease in accuracy and stability of the location service. This paper presents a new algorithm, which utilizes multi-space projections of radio space on sub-level signal spaces to mitigate the influence fr...

With the advent of mobile computing devices and cheap location sensing systems, location information has become an important resource both for mobile and ‘desktop users’. In this paper, we describe some key concepts a scaleable ubiquitous location service should be based on. Firstly, we show how such a service can accommodate multiple location sensing systems. Secondly, we discuss hierarchy-bas...

As embedded systems, in their various forms, become ubiquitous, new types of services are offered, aiming to enhance every aspect of the everyday life and allowing users to enjoy pervasive and personalized access to information. Along with the benefits come considerable threats to users’ privacy, as these enhanced services operate on private sensitive information, such as the true identity and ...

Location-aware services are a promising way of exploiting the special possibilities created by ubiquitous mobile devices and wireless communication. Advanced location-aware applications will require highly accurate information about the geographic location of mobile objects and functionality that goes beyond simply querying the user's position, for example determining all mobile objects inside ...

A resource discovery protocol allows networked embedded processors and handheld devices to discover each other’s capabilities. Service Location Protocol (SLP) has been proposed by the IETF for that purpose. The usage of bandwidth, or the amount of traffic, that such a protocol makes is a characteristic that is particularly relevant when devices are mobile and wireless. Protocols that are less c...

This document describes an XML-based protocol for mapping service identifiers and geodetic or civic location information to service contact URIs. In particular, it can be used to determine the location-appropriate Public Safety Answering Point (PSAP) for emergency services.

This paper describes the OpenLSD framework combining multicast-based, peer-to-peer network service discovery with physical location awareness. A number of useful services based on the framework are described. The concepts of virtual locations and digital proxies for physical services are introduced and used together with a physically based scope mechanism (aura and nimbus). A simple extensible ...