Apparatus and method for making measurements in mobile telecommunications system user equipment
View Patent ↗A method and apparatus for selecting cells in a mobile telecommunications system, the system comprising a network of a plurality of cells of a Universal Mobile Telecommunications Systems (UMTS) and a network of a plurality of cells of a second Radio Access Technology (RAT), the method comprising, at a user equipment device: when in UMTS mode, flagging in a neighboring cell list stored on the user equipment device information for a cell of a second RAT which is known to be unsuitable for selection. Information from the neighboring cell list information for the flagged cell may be removed, in particular for a limited period of time.
1. A method of cell reselection by a user equipment device (UE), the UE configured to be operable with a first cellular Radio Access Technology (RAT) and a second cellular RAT, the method comprising:
when the UE is camped on a cell of the first RAT:
the UE not considering as a candidate for reselection a cell of a second RAT which is not suitable, and further not considering said cell of the second RAT as a candidate for reselection for a specified time period,
wherein when the UE is not camped on a cell, said cell permitting an emergency call service.
2. A method of cell reselection by a user equipment device (UE), the UE configured to be operable with a first cellular Radio Access Technology (RAT) and a second cellular RAT, the method comprising:
when the UE is camped on a cell of the first RAT:
the UE not considering as a candidate for reselection a cell of a second RAT which is not suitable, and further not considering said cell of the second RAT as a candidate for reselection for a specified time period;
generating measurement data for the cells in a neighbouring cell list;
identifying from the measurement data a cell that meets a cell reselection criterion; and
when the identified cell is determined to be a cell of the second RAT, determining whether the identified cell is suitable for reselection.
3. The method of claim 2 , in wherein the neighbouring cell list is received from the cell of the first RAT.
4. A user equipment device (UE) configured to be operable with a first cellular Radio Access Technology (RAT) and a second cellular RAT, the UE comprising:
a processor and memory, the UE being operable so that, when the UE is camped on a cell of the first RAT:
the UE not considering as a candidate for reselection a cell of a second RAT which is not suitable, and further not considering said cell of the second RAT as a candidate for reselection for a specified time period, wherein when the UE is not camped on a cell, said cell permitting an emergency call service.
5. A user equipment device (UE) configured to be operable with a first cellular Radio Access Technology (RAT) and a second cellular RAT, the UE comprising:
a processor and memory, the UE being operable so that, when the UE is camped on a cell of the first RAT:
the UE not considering as a candidate for reselection a cell of a second RAT which is not suitable, and further not considering said cell of the second RAT as a candidate for reselection for a specified time period,
wherein said memory storing instructions that, when executed by the processor, (i) generate measurement data for cells in a neighbouring cell list, (ii) identify from the measurement data a cell that meets a cell reselection criterion, and, when the identified cell is determined to be a cell of the second RAT, determine whether the identified cell is suitable for reselection.
6. The device of claim 5 , wherein the neighbouring cell list is received from the cell of the first RAT.
7. A user equipment device (UE) configured to be operable with a first cellular Radio Access Technology (RAT) and a second cellular RAT, the UE comprising:
at least one transceiver configured to enable the UE to camp on a first cell configured to be operable with the first cellular RAT and a second cell configured to be operable with the second cellular RAT;
a processor; and
a memory for storing instructions that, when executed by the processor, cause the UE, when camped on the first cell, to:
(i) not consider the second cell as a candidate for reselection when it is not suitable for camping on, and
(ii) not consider said second cell as a candidate for reselection for a specified time period.
8. The device of claim 7 , further comprising:
said memory storing instructions that, when executed by the processor, (i) generate measurement data for cells in a neighbouring cell list, (ii) identify from the measurement data a cell that meets a cell reselection criterion, and, when the identified cell is determined to be a cell of the second RAT, determine whether the identified cell is suitable for reselection.
9. The device of claim 7 , wherein the neighbouring cell list is received from the cell of the first RAT.