US 2011/0256871 A1 · Mobility Influenced by Radio Uplink Failure

Abstract

An intelligent subscriber and method of the subscriber roaming between base stations is presented. An unexpected uplink, such as a request to initiate communication, a SMS communication or request to change talkgroup, is transmitted to a base station. When a predetermined number of such uplinks remain unacknowledged by the base station, the subscriber determines that terminal failure of the base station has occurred. An ordered list of available base stations able to serve the subscriber is maintained in subscriber memory. The ordering is based on service level and within each service level by radio measurements. The list is manipulated such that the service level of the original base station is minimized A new base station is selected using the manipulated ordered list. The service level of the original base station is then restored. A communication is sent to an external host to record information about the terminal failure.

Claims20

Dependent claims

A method of roaming between base stations in a wireless communication system by a subscriber, the method comprising the subscriber:

transmitting uplink signals to an original base station, the uplink signals being unexpected by the original base station;
selecting a new base station different from the original base station due to the subscriber failing to receive an acknowledgement to a predetermined number of transmitted uplink signals from the original base station;
and
transmitting a new uplink signal to the new base station after having selected the new base station.

1 more element

An intelligent subscriber comprising:

a transmitter configured to transmit an unexpected uplink signal to an original base station in an infrastructure of a communication system;
a receiver configured to receive an acknowledgment corresponding to the unexpected uplink signal from the original base station;
a processor configured to execute programming instructions;
and
a non-transitory computer readable medium containing the programming instructions,
wherein the programming instructions, when executed by the processor, cause the processor to determine whether the original base station has failed to acknowledge a predetermined number of unexpected uplinks signals transmitted from the transmitter to the original base station and thus that terminal failure of the original base station has occurred and, if terminal failure of the original base station has occurred, to select a new base station different from the original base station.

3 more elements

Dependencies are inferred from the claim text.

Mobility Influenced by Radio Uplink Failure

Life of this patent

Mobility Influenced by Radio Uplink Failure

Life of this patent

Abstract

Claims20