Local node for a waste management system
An enhanced local node to be installed to a waste collection site. A radio interface unit is configured for communication using signals specified for radio access in a radio access network, and a radar unit is configured to use information on received or transmitted signals of the radio interface unit to determine a distance from the local node to refuse objects inside a container. The local node thus uses the same signals to detect a fill state of a container and to transmit the fill state of the container from the local node to the control node.
1. A method performed in a local node of a waste management system, comprising
using radio signals of a radio interface unit of the local node for communication in the radio access network, wherein the radio signals are specified for radio access and communication in a radio access network;
using predefined information on one or more of said radio signals specified for radio access in the radio access network transmitted or received by the radio interface unit of the local node as radar input data, the said one or more of said radio signals being the same one or more of said radio signals used by the radio interface unit for the radio access and communication;
determining a distance from the local node to objects inside a container from the radar input data;
determining a fill state of a container from the determined distance;
generating an indication of the fill state of the container; and
transmitting the indication of the fill state of the container to a control node of a waste management system.
2. A local node of a waste management system, comprising
a radio interface unit configured for communication using radio signals specified for radio access and communication in a radio access network;
a radar unit; and
an interface enabling exchange of information between the radio interface unit and the radar unit; wherein
the radar unit is configured to receive from the radio interface unit predefined information on one or more of said radio signals specified for radio access in the radio access network transmitted or received by the radio interface unit, the said one or more of said radio signals being the same one or more of said radio signals used by the radio interface unit for the radio access and communication;
the radar unit is configured to use the predefined information as radar input data;
the radar unit is configured to determine a distance from the local node to objects inside a container from the radar input data received from the radio interface unit;
the radar unit is configured to determine a fill state of the container from the determined distance;
the radar unit is configured to generate an indication of the fill state of the container and forward it to the radio interface unit; and
the radio interface unit is configured to transmit the indication of the fill state of the container to a control node of the waste management system.
3. A local node according to claim 2 , wherein the predefined information conveys an indication of a delay of a signal that is transmitted and then reflected from the objects inside the container.
4. A local node according to claim 3 , wherein the radar unit is an active radar configured to
determine the delay as a time of flight of a signal transmitted by the radio interface unit and then reflected from the objects inside the container;
determine the distance from the local node to objects inside the container from the determined time of flight.
5. A local node according to claim 4 , wherein
the radio interface unit is configured to transmit one or more signals in response to a request by the radar unit;
the radar unit is configured to receive from the radio interface unit predefined information related to the one or more transmitted signals;
the radar unit is configured to compute the delay from the predefined information related to the one or more transmitted signals.
6. A local node according to claim 3 , wherein the radar unit is a passive radar configured to
receive from the radio interface unit a synchronisation sequence between the radio interface unit and an access node of the applied radio access network;
estimate the delay from correlation of a signal with a delayed copy of itself in the synchronisation sequence;
determine the distance from the local node to objects inside the container from the estimated delay.
7. A local node according to claim 2 , wherein the one or more signals of the predefined information are signals transmitted or received by the radio interface unit independently of the operation of the radar unit.
8. A local node according to claim 2 , wherein
the radar unit is configured to use the predefined information to detect a user closing the site or the container;
the radar unit is configured trigger a user service function in response to the detection of the user.
9. A local node according to claim 8 , wherein the user service function includes activation of a software application in the local node.
10. A local node according to claim 2 , wherein
the local node includes a mechanical opening system arranged to respond to a predefined input signal by opening access to the container;
the local node is arranged to provide the predefined signal in response to receiving information that confirms identity of a user of the container.
11. A local node according to claim 2 , wherein
the radar unit is configured to use the predefined information from the radio interface unit to compute a form of an object that a user intends to insert into the container;
the radar unit is configured to detect if the detected form of the object is compliant with parameters predefined for the container;
the radar unit is configured to trigger an output of a user indication, if the detected form of the object is not compliant with parameters predefined for the container.
12. A container including a local node of claim 2 .