User equipment and downlink synchronization determining method in the user equipment
AssigneeNtt Docomo, Inc.
InventorHiroyuki Ishii
Life of this patent
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Abstract
To determine a downlink synchronization state in a DRX state or in a state in which uplink timing synchronization is not maintained in user equipment, a mobile station configured to perform communications with a radio base station determines a downlink synchronization state by comparing RSRP measured based on a downlink reference signal transmitted from the radio base station with Qrxlevmin notified from the radio base station when the mobile station is in a connected state in which a radio link with the radio base station is established and in the discontinuous reception state.
Claims11
A user equipment comprising:
- a receiving section configured to receive a downlink signal transmitted from a radio base station;
- a radio link quality measuring section configured to measure radio link quality of the downlink signal received in the receiving section;
- a state managing section configured to manage whether or not communications with the radio base station are in a discontinuous reception state from a monitoring result of a downlink control channel;
- a synchronization determining section configured to determine a downlink synchronization state based on the radio link quality measured in the radio link quality measuring section, when whether or not the communications are in a discontinuous reception state is notified from the state managing section, and the communications are in a connected state in which a radio link is established with the radio base station and are in the discontinuous reception state;
- and
- wherein the synchronization determining section switches a synchronization determining scheme for determining the downlink synchronization state in the case that the communications are in the connected state in which the radio link is established with the radio base station and are in the discontinuous reception state, and in the case that the communications are in the connected state in which the radio link is established with the radio base station and are not in the discontinuous reception state.
A downlink synchronization determining method in a user equipment, comprising the steps of:
- receiving a downlink signal transmitted from a radio base station;
- measuring radio link quality of the signal received in downlink;
- managing whether or not communications with the radio base station are in a discontinuous reception state from a monitoring result of a downlink control channel;
- determining a downlink synchronization state based on the radio link quality measured in the radio link quality measuring section, when the communications are in a connected state in which a radio link is established with the radio base station and are in the discontinuous reception state;
- and
- wherein a synchronization determining scheme for determining the downlink synchronization state is switched in the case that the communications are in the connected state in which the radio link is established with the radio base station and are in the discontinuous reception state, and in the case that the communications are in the connected state in which the radio link is established with the radio base station and are not in the discontinuous reception state.
Dependencies are inferred from the claim text.