Wireless communications network
First Claim
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1. A method for determining information regarding a mobile terminal'"'"'s movement within a wireless network including a plurality of fixed and mobile terminals, the method comprising the steps of:
- measuring synchronised Received Signal Strength Information (RSSI) measurements at, at least, two different points in time from at least three fixed terminals for a mobile terminal moving within the network;
interpolating the synchronised measurements to provide an estimate of the distance of the mobile terminal, from each of the at least three fixed terminals, at each different point in time;
determining an estimated position of the mobile terminal, at each different point in time, from the estimated distances of the mobile terminal from each of the fixed terminals; and
determining the mobile terminal velocity by dividing the distance between the positions of the mobile terminal at the two different points in time by the time interval between the two different points in time.
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Abstract
A wireless telecommunications network (100) comprises a multiplicity of Bluetooth™ units, some of which are fixed and act as base units (BS1; BS2; BS3; BS4) and some mobile (MS1; MS2; MS3; MS4). The fixed units are connected to a Local Area Network (LAN) along with a telephony gateway (4) and a PABX (5) and PSTN (6). Methods for controlling handoff of mobile units while roaming within the network are provided, as well a method for determining the order of handoffs and the positions of mobile positions within the network.
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Citations
37 Claims
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1. A method for determining information regarding a mobile terminal'"'"'s movement within a wireless network including a plurality of fixed and mobile terminals, the method comprising the steps of:
- measuring synchronised Received Signal Strength Information (RSSI) measurements at, at least, two different points in time from at least three fixed terminals for a mobile terminal moving within the network;
interpolating the synchronised measurements to provide an estimate of the distance of the mobile terminal, from each of the at least three fixed terminals, at each different point in time;
determining an estimated position of the mobile terminal, at each different point in time, from the estimated distances of the mobile terminal from each of the fixed terminals; and
determining the mobile terminal velocity by dividing the distance between the positions of the mobile terminal at the two different points in time by the time interval between the two different points in time. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- measuring synchronised Received Signal Strength Information (RSSI) measurements at, at least, two different points in time from at least three fixed terminals for a mobile terminal moving within the network;
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8. A wireless network comprising a plurality of fixed terminals in communication with one or more mobile terminals roaming within the network, the network including control means operable to determine the velocity of a mobile terminal by measuring synchronised Received Signal Strength Information (RSSI) measurements for the mobile terminal from at least three fixed terminals at at least two different points in time;
- to interpolate the measurements to provide an estimate of the distance of the mobile terminal from each of the at least three fixed terminals at each different point in time;
to estimate a position of the mobile terminal, at each different point in time, from the estimated distances of the mobile terminal from the at least three fixed terminal; and
to determine the velocity of the mobile terminal by dividing the distance between the positions of the mobile terminal at the two different points in time by the time interval between the two different points in time. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
- to interpolate the measurements to provide an estimate of the distance of the mobile terminal from each of the at least three fixed terminals at each different point in time;
- 16. A wireless network comprising a plurality of terminals, the terminals being operable within the network as either master or slave units, and within the network there is provided first second and third terminals in which the first and second terminals are in communication with each other in a first piconet whereby the first terminal is a master unit and the second terminal is a slave unit, the terminals being operable to control a switch in communication between the second and first terminals to communication between the second and third terminals in a second piconet.
- 20. A method for performing handoff from a first terminal in communication with a second terminal, to a third terminal in a wireless network comprising a plurality of terminals, the terminals being operable within the network as either master or slave units, and within the network there is provided the first second and third terminals in which the first and second terminals are in communication with each other in a first piconet whereby the first terminal is a master unit and the second terminal is a slave unit, the method including the step of controlling a switch in communication between the second and first terminals to communication between the second and third terminals in a second piconet.
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24. A method for determining handoff sequencing within a wireless network comprising a plurality of fixed terminals in wireless communication with one or more mobile terminals roaming within the network, the method including the steps of:
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determining the probable paths of the mobile terminals within the network;
determining a set of fixed terminals within the network to which the mobile terminals could be in communication therewith;
creating a first bipartite graph with the set of fixed and mobile terminals;
applying weightings to the edges of the first bipartite graph in accordance with predetermined parameters to create a weighted bipartite graph; and
solving an optimal assignment problem for the weighted bipartite graph to derive a second graph having a second set of edges, to determine a new set of connections between mobile and fixed terminals. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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- 31. A wireless network comprising a plurality of fixed terminals in wireless communication with one or more mobile terminals roaming within the network, the network including a control means operable to determine the probable paths of the mobile terminals within the network, and a set of fixed terminals within the network to which the mobile terminals could be in communication therewith, the control means being further operable to create a first bipartite graph with the set of fixed and mobile terminals, to apply weightings to the edges of the first bipartite graph in accordance with predetermined parameters to create a weighted bipartite graph, and to solve an optimal assignment problem for the weighted bipartite graph to derive a second graph having a second set of edges, to determine a new set of connections between mobile and fixed terminals.
Specification