Cell selection in mobile communications
First Claim
1. A mobile device for use in a wireless network, the device comprising cell selection apparatus for use to select a cell from a candidate set of cells to support subsequent communication between a wireless network and the device, said cell selection apparatus being triggerable, by a transition of the device out of an existing connected mode state in which communication is supported by a serving cell or an active set of one or more cells, to select said cell,wherein the mobile device comprises a data store for storing cell power measurement data;
- wherein the cell selection apparatus is adapted to use as said candidate set a set of cells comprising at least one cell which is not a cell supporting the existing connected mode state andwherein the cell selection apparatus further comprises parameter adjustment means arrange to adjust at least one parameter for at least one cell of the candidate set of cells, thereby changing a probability that said at least one cell will be selected, the parameter adjustment being performed at the mobile device, wherein said parameter adjustment means is arranged to adjust a stored value of a previously measured power measurement for the at least one cell.
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Abstract
Mobile user equipment for use in a cellular communications environment performs an improved cell selection on transitions out of a connected mode state. The transitions might be from one connected mode state to another or from a connected mode state to idle mode. The improvement in cell selection lies in assembling the list of candidate cells prior to cell selection. In the prior art, the list of candidate cells would usually be restricted to the serving cell or active cells supporting communication between the equipment and the network prior to transition. In embodiments of the invention, the list might comprise cells which are not the serving cell or which are outside the active set, for example a network-preferred cell or cells neighboring the serving cell or cells of the active set.
20 Citations
25 Claims
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1. A mobile device for use in a wireless network, the device comprising cell selection apparatus for use to select a cell from a candidate set of cells to support subsequent communication between a wireless network and the device, said cell selection apparatus being triggerable, by a transition of the device out of an existing connected mode state in which communication is supported by a serving cell or an active set of one or more cells, to select said cell,
wherein the mobile device comprises a data store for storing cell power measurement data; -
wherein the cell selection apparatus is adapted to use as said candidate set a set of cells comprising at least one cell which is not a cell supporting the existing connected mode state and wherein the cell selection apparatus further comprises parameter adjustment means arrange to adjust at least one parameter for at least one cell of the candidate set of cells, thereby changing a probability that said at least one cell will be selected, the parameter adjustment being performed at the mobile device, wherein said parameter adjustment means is arranged to adjust a stored value of a previously measured power measurement for the at least one cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of a mobile device selecting a cell of a network to support subsequent communications between the network and the mobile device on transition of the mobile device out of an existing connected mode state in which communication is supported by a serving cell or an active set of one or more cells, which method comprises the mobile device:
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i) assembling a candidate list of cells; and ii) selecting a cell from the candidate list, wherein operation i) comprises the mobile device identifying for said candidate list at least one cell which is not a cell supporting the existing connected mode state, said at least one cell meeting one or more predetermined criteria; and further comprising the mobile device adjusting a value for at least one parameter of a cell in the candidate list, prior to operation ii), so as to change the likelihood of selection of said cell, the parameter being performed by the mobile device, wherein said at least one parameter comprises a stored value of a previously measured power measurement for the cell. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification