Performing idle mode mobility measurements in a mobile communication network

A method in a user equipment (UE) in a mobile communication network, the method comprising:

• measuring cell quality parameters on serving cells at a plurality of idle mode cell re-selections,
• saving the measured serving cell quality parameters in a local storage,
• if a measurement parameter threshold for idle mode mobility measurement is not set by a SIB message or if the SIB message includes an indication to not use a configured measurement parameter threshold in the SIB message, calculating an updated idle mode cell re-selection measurement parameter threshold from the saved serving cell quality parameters, wherein the UE performs intra-frequency, inter-frequency, or inter-RAN measurements of neighboring cells when a certain parameter of a serving cell is below or equal to the updated idle mode cell re-selection measurement parameter threshold,
• adding an offset to the updated measurement parameter threshold, and
• setting the summation as the measurement parameter threshold for subsequent idle mode cell re-selection.

A non-transitory machine readable medium encoded with machine-executable instructions, wherein execution of the machine-executable instructions is for:

• receiving, from a serving cell, a system information block (SIB) message;
• if a measurement parameter threshold for idle mode mobility measurement is not set by the SIB message or if the SIB message includes an indication to not use a configured measurement parameter threshold in the SIB message, setting an initial measurement parameter threshold for at least one idle mode cell re-selection, wherein the UE performs intra-frequency, inter-frequency, or inter-RAN measurements of neighboring cells when a certain parameter of a serving cell is below or equal to the initial measurement parameter threshold;
• and
• setting a threshold for the measurement parameter for subsequent idle mode mobility measurements with a predetermined decrement from the initial measurement parameter threshold.

A user equipment (UE) in a mobile communication network, the UE comprising:

• one or more processors configured to:
• measure cell quality parameters on serving cells at a plurality of idle mode cell re-selections,
• save the measured serving cell quality parameters,
• if a measurement parameter threshold for idle mode mobility measurement is not set by a SIB message or if the SIB message includes an indication to not use a configured measurement parameter threshold in the SIB message, calculate an updated measurement parameter threshold from the saved serving cell quality parameters in the storage, wherein the UE performs intra-frequency, inter-frequency, or inter-RAN measurements of neighboring cells when a certain parameter of a serving cell is below or equal to the updated idle mode cell re-selection measurement parameter threshold,
• add an offset to the updated measurement parameter threshold, and
• set the summation as the measurement parameter threshold for subsequent idle mode cell re-selection.

A non-transitory machine readable medium encoded with machine-executable instructions, wherein execution of the machine-executable instructions is for:

• receiving, from the network, a system information block (SIB) message;
• and
• if a measurement parameter threshold for idle mode mobility measurement is not set by the SIB message or if the SIB message includes an indication to not use a configured measurement parameter threshold in the SIB message, setting an initial measurement parameter threshold for at least one idle mode cell re-selection, wherein the UE performs intra-frequency, inter-frequency, or inter-RAN measurements of neighboring cells when a certain parameter of a serving cell is below or equal to the initial measurement parameter threshold;
• and
• setting a threshold for the measurement parameter for subsequent idle mode mobility measurements with a predetermined decrement from the initial measurement parameter threshold.

A user equipment (UE) in a mobile communication network, the UE comprising:

• one or more processors configured to:
• receive, from the network, a system information block (SIB) message;
• and
• if a measurement parameter threshold for idle mode mobility measurement is not set by the SIB message or if the SIB message includes an indication to not use a configured measurement parameter threshold in the SIB message, set an initial measurement parameter threshold for at least one idle mode cell re-selection, wherein the UE performs intra-frequency, inter-frequency, or inter-RAN measurements of neighboring cells when a certain parameter of a serving cell is below or equal to the initial measurement parameter threshold;
• and
• set a threshold for the measurement parameter for subsequent idle mode mobility measurements with a predetermined decrement from the initial measurement parameter threshold.