CELL SELECTION IN MOBILE COMMUNICATIONS
First Claim
1. A method to select a cell in a mobile communications equipment (MCE) when transitioning from a connected mode state to an idle mode state, the MCE configurable for use in a cellular network, the method comprising:
- beginning state transition activity, the MCE currently in the connected mode state;
identifying a set of UMTS-based candidate cells, wherein at least one of the set of candidate cells is a cell which is not currently supporting the connected mode state;
storing information relating to at least one candidate cell which is not currently supporting the connected mode state arising from past data gathering by the MCE, the information gathered previous to state transition activity;
selecting a candidate cell from the identified set of candidate cells that includes the at least one cell which is not currently supporting the connected mode state; and
transitioning to an idle mode state from the connected mode state.
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Accused Products
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 neighbouring the serving cell or cells of the active set.
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Citations
22 Claims
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1. A method to select a cell in a mobile communications equipment (MCE) when transitioning from a connected mode state to an idle mode state, the MCE configurable for use in a cellular network, the method comprising:
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beginning state transition activity, the MCE currently in the connected mode state; identifying a set of UMTS-based candidate cells, wherein at least one of the set of candidate cells is a cell which is not currently supporting the connected mode state; storing information relating to at least one candidate cell which is not currently supporting the connected mode state arising from past data gathering by the MCE, the information gathered previous to state transition activity; selecting a candidate cell from the identified set of candidate cells that includes the at least one cell which is not currently supporting the connected mode state; and transitioning to an idle mode state from the connected mode state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile communications equipment (MCE) configured for use in a cellular network, comprising:
a processor and operating environment configured to run software processes, the software processes configured to enable the MCE to transition from a connected mode state to an idle mode state, and to determine a set of UMTS-based candidate cells, wherein at least one of the set of candidate cells is a cell which is not currently supporting the connected mode state, and further configured to store information relating to at least one candidate cell of the candidate cell set which is not currently supporting the connected mode state, the information gathered previous to the state transition and to select a candidate cell from the identified set of candidate cells that includes the at least one cell which is not currently supporting the connected mode state and to use the selected member when transitioning to the idle mode state from the connected mode state. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method to select a cell in a mobile communications equipment (MCE) when transitioning from a first connected mode state to a second connected mode state, the MCE configurable for use in a cellular network, the method comprising:
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beginning state transition activity, the MCE currently in the first connected mode state; identifying a set of UMTS-based candidate cells, wherein at least one of the candidate cells is a cell which is not currently supporting the first connected mode state; storing information relating to at least one candidate cell of the identified candidate set which is not currently supporting the first connected mode state arising from past data gathering by the MCE and corresponding to the same cell; selecting a candidate cell from the identified set of candidate cells that includes the at least one cell which is not currently supporting the connected mode state; and transitioning to the second connected mode from the first connected mode state using the selected candidate cell, where the first and second connected mode states are, each, one of;
Cell_FACH, Cell_PCH, and URA_PCH. - View Dependent Claims (14, 15, 16, 17)
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18. A mobile communications equipment (MCE) configured for use in a cellular network, comprising:
a processor and operating environment configured to run software processes, the software processes configured to enable the MCE to transition from a first connected mode state to a second connected mode state, to store information with respect to at least one candidate cell of the identified cell set, the information gathered previous to the state transition, and to determine a set of UMTS-based candidate cells wherein at least one of the set of candidate cells is a cell which is not currently supporting the first connected mode state, and further configured to select a candidate cell from the identified set of candidate cells that includes the at least one cell which is not currently supporting the connected mode state and to use the selected member when transitioning to the second connected mode state from the first connected mode state where the first and second connected mode states are, each, one of;
Cell_FACH, Cell_PCH, and URA_PCH.- View Dependent Claims (19, 20, 21, 22)
Specification