Method of enhanced connection recovery and cell selection
First Claim
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1. A method, comprising:
- establishing a radio resource control (RRC) connection by a user equipment (UE) with a base station in a mobile communication network;
detecting a radio link problem of the RRC connection and thereby starting a first timer associated with the radio link problem;
starting a second timer upon detecting a triggering condition while the first timer is not expired;
initiating an RRC reestablishment procedure with a target cell when the second timer expires but before the first timer expires; and
performing the RRC connection reestablishment procedure with the target cell.
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Abstract
An enhanced connection recovery upon lost RRC connection due to radio link failure (RLF) or handover failure (HOF) is proposed. A UE first establishes an RRC connection in a source cell in a mobile communication network. Later on, the UE detects a failure event and starts an RRC reestablishment procedure in a target cell to restore the RRC connection. In a first novel aspect, a fast RLF process is applied to reduce the outage time in the serving cell. In a second novel aspect, an enhanced cell selection mechanism based on cell prioritization information is applied to reduce the outage time in the target cell. In one embodiment, multi-RAT registration is used to steer cell selection.
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Citations
21 Claims
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1. A method, comprising:
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establishing a radio resource control (RRC) connection by a user equipment (UE) with a base station in a mobile communication network; detecting a radio link problem of the RRC connection and thereby starting a first timer associated with the radio link problem; starting a second timer upon detecting a triggering condition while the first timer is not expired; initiating an RRC reestablishment procedure with a target cell when the second timer expires but before the first timer expires; and performing the RRC connection reestablishment procedure with the target cell. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A user equipment (UE), comprising:
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a radio resource control (RRC) module that establishes an RRC connection with a base station in a mobile communication network; a radio link management (RLM) module that initiates a first timer when detecting a radio link problem; and a cell selection module that selects a target cell based on cell prioritization information when the UE is in a high mobility state, wherein the cell prioritization information comprises information for cell selection as well as for cell reselection, and wherein the UE initiates an RRC reestablishment procedure and performs an RRC connection setup procedure with the selected target cell. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A user equipment (UE), comprising:
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a radio resource control (RRC) management module that establishes an RRC connection with a base station in a mobile communication network; a radio link management (RLM) module that detects a radio link problem of the RRC connection and thereby starting a first timer, wherein the RLF module also starts a second timer upon detecting a triggering condition while the first timer is not expired, wherein the UE initiates an RRC reestablishment procedure with a target cell when the second timer expires but before the first timer expires; and a cell selection module that selects a target cell, wherein the UE performs the RRC connection reestablishment with the target cell. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification