Teme de cercetare
Gestiunea documentelor folosind radio fingerprints
AirDocs (Documents in the Air) is a middleware system that allows a smartphone to place and retrieve documents at different indoor locations without using a positioning system. It:
1. relies on WiFi infrastructure existing in most homes and institutions
2. requires only a single additional server visible in the intranet, and an app that can be installed on any smartphone.
3. does not require training of, or support from a location service
4. enables many applications that involve natural placing / retrieving documents at locations
WiFi signal indoor propagates in an irregular fashion due to multipath and shadowing caused by the building itself, furniture, and people. But at a given location, propagation to and from access points, while not predictable, is relatively stable in time and is specific to that location. The same can be said about GSM/4G propagation, as well as sound reflections from the walls - the collection of these measurements is unique to the location they are measured at. The wireless measurements (WiFi, 2G/3G/4G, Bluetooth) are monitored permanently by all smartphones as part of their normal functioning, requiring no additional gathering effort. We aggregate all these measurements into a “rich signature” for the physical location as shown in Figure 1:
Other sensors available on the smartphones can also be used: sound, magnetic, compass. The unique rich signatures obtained can then be used to manage a document collection without mapping them to geographical locations, but in fact obtaining an association between a document and its unique location in the building. The datastructure obtained is like a location indexed database, but without the location. The middleware will offer three main primitives to the applications:
1. S = CreateSgn() harvests location specific signal statistics from the phone sensors(WiFi, 3G, sound, etc) and creates a multidimensional signature that cannot be confused with any other location signature in the building;
2. Put(S, document) stores a document on the server associated with the signature S; The signature is created by a phone, but the indexing of the signatures and the document storage happen on a server in the intranet (or Internet).
3. Get(S) - a phone harvests its current signature, and asks the server for a list of documents that have “close” signatures, meaning documents that have been stored at the same location. The server searches in signature space, and real geographical coordinates are never stored.
What is achieved is a form of augmented reality with the users having the illusion of the documents being spread in the physical environment, only visible at certain locations. Leaving a document “in the air” allows for a natural way to use it as a wireless post-it for museums explanation, malls maps & directions, lab door announcements, restaurant menus, etc. The purpose of this research project is to experiment with rich signatures(creation, maintenance, classification), searches in signature space, implement a proof of concept for the middleware, and a simple Android wireless post-it application. Full blown applications will have to consider institution specific document policies (their max size and life length), security(who can create documents), scalability, and an appropriate human interface to facilitate production and consumption of spatial data.
Reducerea latenței în sistemele 5G
- model latency in packet processing environments
- NFV latency and provisioning
- reduce latency methods
- horizontal scaling up
- transport layer
- latency reduction in EPC, MEC and SGi LAN
Implementare MPTCP proxy server