Base station apparatus and communications control method
AssigneeNtt Docomo, Inc.
InventorsHiroyuki Ishii, Minami Ishii, Kenichi Higuchi
Life of this patent
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Abstract
An out-of-synchronization determining section that determines uplink out of synchronization with the mobile station in accordance with a reception timing of the uplink signal is provided in a base station apparatus for carrying out communications with a mobile station, wherein the mobile station transmits an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access.
Claims27
A base station apparatus for carrying out communications with a mobile station, wherein the mobile station transmits an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access, the base station apparatus being characterized by:
- an out-of-synchronization determining section that determines uplink out of synchronization with the mobile station in accordance with a reception timing of the uplink signal.
A base station apparatus that carries out communications with plural mobile stations, wherein the mobile stations transmit an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access, the base station apparatus being characterized in that an uplink resource or a downlink resource is not assigned to a mobile station for which an uplink is detected to be out of synchronization.
A base station apparatus that carries out communications with plural mobile stations, wherein the mobile stations transmit an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access, the base station apparatus being characterized in that communication with a mobile station for which an uplink is detected to be out of synchronization is disconnected.
A base station apparatus that carries out communications with plural mobile stations, wherein the mobile stations transmit an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access, the base station apparatus being characterized in that a message for directing reestablishment of synchronization using a random access channel is provided for a mobile station whose uplink is detected to be out of synchronization.
A base station apparatus for carrying out communications with a mobile station, wherein the mobile station transmits an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access at the time of starting the communications, the base station apparatus being characterized by:
- an synchronization establishment determining section for determining plural synchronization states of uplink synchronization with the mobile station in accordance with a reception timing of the uplink signal, a reception quality of an uplink pilot signal, and an uplink data error rate.
A base station apparatus for carrying out communications with a mobile station, wherein the mobile station transmits an uplink signal by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access at the time of starting the communications, the base station apparatus being characterized by:
- a synchronization establishment determining section for determining that uplink synchronization with the mobile station is established in accordance with at least one of a reception timing of the uplink signal and a reception quality of an uplink pilot signal.
A communications method in a base station apparatus for carrying out communications with a mobile station, the method being characterized by steps of:
- receiving an uplink signal transmitted from the mobile station by Single-Carrier Frequency Division Multiple Access or Orthogonal Frequency Division Multiple Access;
- and
- determining that an uplink with the mobile station is out of synchronization in accordance with a reception timing of the uplink signal.
Dependencies are inferred from the claim text.