Mobile communication system

Patent metadata

Field	Value
Publication number	US-9565713-B2
Application number	US-201113576963-A
Country	US
Kind code	B2
Filing date	Feb 9, 2011
Priority date	Feb 12, 2010
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A mobile communication system capable of reducing energy consumption of a network node in a local area range. When judging that there is a shift trigger, a local eNB shifts from a normal operation to an energy saving operation. In the energy saving operation, the local eNB stops the operation of transmitting at least a part of downlink transmission signals to be transmitted to a user equipment (UE) and performs the operation of receiving an uplink transmission signal transmitted from the UE. When judging that it has received the uplink transmission signal (RACH) in the energy saving operation, the local eNB shifts to the normal operation.

First claim

The invention claimed is:

1. A mobile communication system comprising:
a local base station device; and
a user equipment device configured to perform radio communication with at least said local base station device, wherein
upon predetermined shift conditions being satisfied, said local base station device shifts from a normal operation state to an energy saving operation state, said local base station device performing a transmission operation for transmitting downlink transmission signals to said user equipment device and a reception operation for receiving uplink transmission signals transmitted from said user equipment device in said normal operation state and stopping the transmission operation for at least part of the downlink transmission signals and performing said reception operation in said energy saving operation state,
upon the local base station device in said energy saving operation state receiving said uplink transmission signals transmitted from said user equipment device, said local base station device shifts from said energy saving operation state to said normal operation state, and the mobile communication system further comprising a communication device configured to perform radio communication or wire communication with said local base station device,
wherein said shift conditions include at least one of conditions that:
(a) said user equipment device being in a connected state with said local base station device does not exist for a predetermined period;
(b) an instruction to shift from said normal operation state to said energy saving operation state is provided by a base station device other than said local base station device or a communication device.

2. A mobile communication system comprising:
a local base station device; and
a user equipment device configured to perform radio communication with at least said local base station device, wherein
upon predetermined shift conditions being satisfied, said local base station device shifts from a normal operation state to an energy saving operation state, said local base station device performing a transmission operation for transmitting downlink transmission signals to said user equipment device and a reception operation for receiving uplink transmission signals transmitted from said user equipment device in said normal operation state and stopping the transmission operation for at least part of the downlink transmission signals and performing said reception operation in said energy saving operation state, and
upon the local base station device in said energy saving operation state receiving said uplink transmission signals transmitted from said user equipment device, said local base station device shifts from said energy saving operation state to said normal operation state,
wherein said local base station device notifies a neighboring node of configuration parameters for uplink transmission needed by the user equipment device to perform uplink transmission to said local base station device during the energy saving operation state and said user equipment device obtains the needed configuration parameters from the neighboring node.

3. The mobile communication system according to claim 2 , wherein said configuration parameters are based on measurement results of the surrounding radio environment of the local base station device.

4. The mobile communication system according to claim 3 , wherein said measurement results of the surrounding radio environment include the measurement results of reception quality of a neighboring cell.

5. The mobile communication system according to claim 3 , wherein said measurement results of the surrounding radio environment include the measurement results of received power of a neighboring cell.

6. The mobile communication system according to claim 3 , wherein said measurement results of the surrounding radio environment include the measurement results of path loss of a neighboring cell.

Assignees

• Maeda Miho
• Mochizuki Mitsuru
• Iwane Yasushi
• Kakehi Yuji
• Kimura Hitoshi
• Suemitsu Taisei
• Mitsubishi Electric Corp

Inventors

• Maeda Miho
• Mochizuki Mitsuru
• Iwane Yasushi
• Kakehi Yuji
• Kimura Hitoshi
• Suemitsu Taisei

Classifications

• H04W52/0206 Primary

  in access points, e.g. base stations · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W72/21 Primary

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W52/0219

  where the power saving management affects multiple terminals · CPC title