Communications apparatus and method
First Claim
1. A method of operating a user terminal to provide location updates while the user terminal is registered with a communications network providing a communications service, the user terminal being operable to register data concerning its location in a remote management store, the method including:
- monitoring signals received in a given channel transmitted from the communications network in relation to predetermined criteria, timing the duration of periods when the monitored signals do not meet the criteria, and when said monitored signals again meet said criteria and if said timed duration exceeds a predetermined duration, transmitting a location update signal from the user terminal to update the location of the user terminal registered in the management store.
4 Assignments
0 Petitions
Accused Products
Abstract
A mobile satellite communications system having at least one mobile terminal (2), at least one ground station (6), at least one relay satellite (4) interconnecting said user terminal (2) and said ground station (6), and a management store (48) associated with said ground station (6), in which the user terminal (2) is configured to initiate registration signalling with said store (48). The user terminal (2) initiates registration signalling when reception conditions relating to a downlink channel relayed via said satellite (4) become unsatisfactory over a given time greater than a predetermined minimum value and then return to a satisfactory condition. Specifically, signals received in a given channel are monitored in relation to predetermined criteria, and the duration of periods when the monitored signals do not meet the criteria are timed. Signals for updating the location of the user terminal registered in the management store, are transmitted when said monitored signals in said channel again meet said criteria, only if the timed duration for which the monitored signals do not meet the criteria, is not less than a predetermined time (T2).
285 Citations
27 Claims
-
1. A method of operating a user terminal to provide location updates while the user terminal is registered with a communications network providing a communications service, the user terminal being operable to register data concerning its location in a remote management store, the method including:
-
monitoring signals received in a given channel transmitted from the communications network in relation to predetermined criteria, timing the duration of periods when the monitored signals do not meet the criteria, and when said monitored signals again meet said criteria and if said timed duration exceeds a predetermined duration, transmitting a location update signal from the user terminal to update the location of the user terminal registered in the management store. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A user terminal for providing location updates while registered with a communications network providing a communications service, the user terminal being operable to register data concerning its location in a remote management store, including:
-
a monitoring device operative to monitor signals received in a given channel transmitted from the communications network in relation to predetermined criteria, a timer for timing the duration of periods when the monitored signals do not meet the criteria, and a transmitter operative to transmit a location update signal to update the location of the user terminal registered in the management store when said monitored signals again meet said criteria and if said timed duration exceeds a predetermined duration. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
-
Specification