Mobile communication system

Patent metadata

Field	Value
Publication number	US-12375131-B2
Application number	US-202318330840-A
Country	US
Kind code	B2
Filing date	Jun 7, 2023
Priority date	Jan 27, 2012
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

In a mobile communication system, an RRM measurement set is set as a collection of cells to become targets on which a UE performs a process of detecting whether or not radio communication is allowed. Among the cells in the RRM measurement set, a CoMP measurement set is set as a collection of cells to become candidates on which the UE performs a process of detecting whether or not coordinated communication (CoMP communication) is allowed. Among the cells of the CoMP measurement set, a CoMP active set is set as a collection of cells to become targets on which the UE performs the process of detecting whether or not CoMP communication is allowed.

First claim

The invention claimed is:

1. A mobile communication system including:
a plurality of base stations; and
a user equipment, the plurality of base stations performing radio communication with the user equipment in a coordinated manner with each other, wherein
a base station among the plurality of base stations transmits measurement object information to the user equipment, the measurement object information indicating a signal to be measured for coordinated communication by the user equipment among signals transmitted from the plurality of base stations,
the user equipment transmits measurement result information to the base station, the measurement result information indicating a measurement result of a measurement object signal indicated by the measurement object information, and
when handover is performed, the base station transmits a signal notifying that the measurement object signal for coordinated communication is released from a measurement object to the user equipment.

2. The mobile communication system according to claim 1 , wherein the measurement object signal is a reference signal to be measured by the user equipment for obtaining a state of a channel.

3. The mobile communication system according to claim 1 , wherein the measurement object information is transmitted using a communication signal dedicatedly provided for the user equipment.

4. The mobile communication system according to claim 1 , wherein the measurement object information is transmitted using a radio resource control (RRC) signal.

5. The mobile communication system according to claim 1 , wherein the measurement result information is transmitted from the user equipment to the base station that transmits the measurement object information periodically.

6. The mobile communication system according to claim 1 , wherein, when the base station decides to perform the handover, the base station transmits the signal notifying that the measurement object signal for the coordinated communication is released from the measurement object to the user equipment, and
wherein, by dedicated signaling, the base station transmits, the signal notifying that the measurement object signal for the coordinated communication is released, from a measurement object to the user equipment.

7. A base station including a processor of a computer, the base station performing radio communication with a user equipment in a coordinated manner with another base station,
wherein the processor performs control so that:
measurement object information is transmitted to the user equipment, the measurement object information indicating a signal to be measured for coordinated communication by the user equipment among signals transmitted from the base station and the another base station;
measurement result information is received from the user equipment, the measurement result information indicating a measurement result of a measurement object signal indicated by the measurement object information; and
when handover is performed, a signal notifying that the measurement object signal for coordinated communication is released from a measurement object is transmitted to the user equipment.

8. A user equipment including a processor of a computer, the user equipment performing radio communication with a plurality of base stations that operate in a coordinated manner with each other,
wherein the processor performs control so that:
measurement object information is received from a base station among the plurality of base stations, the measurement object information indicating a signal to be measured for coordinated communication by the user equipment among signals transmitted from the plurality of base stations;
measurement result information is transmitted to the base station, the measurement result information indicating a measurement result of a measurement object signal indicated by the measurement object information; and
when handover is performed, a signal notifying that the measurement object signal for coordinated communication is released from a measurement object is received from the base station.

Assignees

• Mitsubishi Electric Corp

Inventors

• Mochizuki Mitsuru
• Maeda Miho
• Uga Shinsuke
• Fukui Noriyuki

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04J11/0073

  Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W36/0005 Primary

  Control or signalling for completing the hand-off · CPC title