Circuit of a node and method for transit time measurement in a radio network

摘要

A circuit of a node in a radio network and method for transit time measurement between a first node and a second node of a radio network is provided. A frame is transmitted by the first node, wherein the frame requires an acknowledgment of reception by the second node. A first point in time of the transmission of the frame is established by the first node by a time counter. The frame is received by the second node at a second point in time. The acknowledgment is transmitted by the second node to the first node at a third point in time, wherein the third point in time depends on the second point in time by a predetermined time interval between the second point in time and the third point in time. A fourth point in time is established by the first node by the time counter when the acknowledgment is received. The transit time or the change in transit time is determined from the first point in time established by the time counter and from the established fourth point in time and from the predetermined time interval.

主权项

1. A circuit comprising:
a transmitting unit, in a first node of a radio network, the transmitting unit configured to transmit a frame from the first node to a second node in the radio network; a control unit, in the first node, the control unit configured to perform operations comprising:
determining a first point in time of transmission of the frame from the first node to the second node;receiving, from the second node, an acknowledgment associated with the frame;establishing a second point in time of the reception, from the second node, of the acknowledgment;determining a transit time by:
determining a first difference between the second point in time and the first point in time;determining a second difference by subtracting a predetermined time interval from the first difference, the predetermined time interval being known to the first and second nodes and comprising a time interval between a third point in time of receipt of the frame by the second node and a fourth point in time of a transmission by the second node of the acknowledgement associated with the frame;halving the second difference; anddetermining a distance between the first node and the second node based on the transit time.