Blackberry Corporation

Research in Motion Corporation

Giri Narayana Reddy

Andrew John Farnsworth

David Philip Hole

Takashi Suzuki

Raghavendra Magadi Rangaiah

Tomasz Henryk Mach

Farnsworth Andrew John

A user equipment is provided comprising: 1) transceiver circuitry configured to operate in cells associated with at least one radio access technology (RAT) network; and 2) a controller configured to perform neighbor cell searches. The controller is further configured to determine when the user equipment enters a first RRC state from a second RRC state. In response to a determination that the user equipment entered a first RRC state from a second RRC state, the controller delays performing a cell search until the controller determines that the user equipment has received complete system information for a serving cell.

Apparatus and method for high priority search on RRC state change

Apparatus and a method are described for handling inter-radio access technology measurement reports in a radio telecommunications device, the device being operable with a first cellular radio access technology (e.g. UTRAN, E-UTRAN), GERAN and Generic Access Network, the radio telecommunications device being capable of adopting a cellular preferred mode. The method comprises, in the radio telecommunications device, when the radio telecommunications device is in cellular preferred mode and operating with the first cellular radio access technology and the radio telecommunications device is registered with a Generic Access Network Controller that operates as a GERAN network component, and a quality of a signal from the first cellular radio access technology is below a certain threshold and a quality of a signal from the GAN is above a certain threshold and a request has been received to send an inter-RAT measurement report, generating inter-radio access technology measurements and, when there is at least one GERAN cell that satisfies a triggering condition, transmitting a measurement report in respect of the GERAN cell(s) and a measurement report in respect of the generic access network.

Method for handling inter-radio access technology measurement requests in a mobile telecommunications device

A user equipment is provided comprising: 1) transceiver circuitry configured to operate in cells associated with at least one radio access technology (RAT) network; and 2) a controller configured to perform neighbor cell searches. The controller is further configured to determine when the user equipment enters a first RRC state from a second RRC state. In response to the determination, the controller determines a time period since a most recent search of neighbor cells was performed. The first RRC state is one of at least: CELL_PCH, URA_PCH and IDLE. The second RRC state is one of at least CELL_FACH and CELL_DCH.

A method in a wireless telecommunications device operative with a plurality of radio access networks, the method comprising: when operating with a first radio access network reading at least one ciphering variable applicable in the second radio access network (e.g. in UMTS reading the value of a variable START from the USIM of the device). When at least one ciphering variable applicable in the second radio access network renders ciphering in the second radio access network infeasible without further authentication (e.g. in UMTS when the value of START in USIM is equal to a value THRESHOLD), using a substitute value for the ciphering parameter (e.g. START) when establishing a connection with the second radio access network.

Apparatus and method of ciphering in wireless telecommunications user equipment operative with a plurality of radio access networks

Apparatus and a method of cell reselection in a wireless telecommunications device operative with a plurality of radio access networks are disclosed. The method comprises, when the device is camped on a first radio access network: ranking cells in a neighboring list according to cell reselection criteria; considering for cell reselection a cell in the neighboring list; when the cell in the list is a cell of a second radio access network different from the first radio access network, applying an algorithm for cell reselection from the second radio access network to the first radio access network; and when the algorithm as applied would result in reselection to the first radio access network, considering for cell reselection another cell in the list.

Growing community of inventors

Birmingham, United Kingdom

Giri Narayana Reddy